gcc/libstdc++-v3/libsupc++/guard.cc

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// Copyright (C) 2002-2014 Free Software Foundation, Inc.
//
// This file is part of GCC.
//
// GCC is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3, or (at your option)
// any later version.
// GCC is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
// Written by Mark Mitchell, CodeSourcery LLC, <mark@codesourcery.com>
Add memory barriers to the double-checked locking used for static initialization. libstdc++: Add memory barriers to the double-checked locking used for static initialization. * libsupc++/guard.cc (__test_and_acquire): Define default. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE, __set_and_release) (_GLIBCXX_GUARD_SET_AND_RELEASE): Likewise. (recursion_push, recursion_pop): New abstraction functions. (__cxa_guard_acquire): Use _GLIBCXX_GUARD_TEST_AND_ACQUIRE. (__cxa_guard_release): Use _GLIBCXX_GUARD_SET_AND_RELEASE. * config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST): Rename from _GLIBCXX_GUARD_ACQUIRE and reverse sense. (_GLIBCXX_GUARD_SET): Rename from _GLIBCXX_GUARD_RELEASE. * config/cpu/arm/cxxabi_tweaks.h: Likewise. * config/cpu/alpha/atomic_word.h (_GLIBCXX_READ_MEM_BARRIER) (_GLIBCXX_WRITE_MEM_BARRIER): Define. * config/cpu/powerpc/atomic_word.h: Likewise. * config/cpu/sparc/atomic_word.h: Likewise. * config/cpu/generic/atomic_word.h: Define them, commented out. * include/bits/atomicity.h: Define defaults. * config/cpu/ia64/atomic_word.h (__test_and_acquire) (__set_and_release): New inlines. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE): Define. (_GLIBCXX_GUARD_SET_AND_RELEASE): Define. * libsupc++/guard.cc (acquire_1): Use __builtin_trap instead of abort(); gcc: * doc/tm.texi (TARGET_RELAXED_ORDERING): Document. * target.h (struct gcc_target): Add relaxed_ordering field. * target-def.h (TARGET_RELAXED_ORDERING): Define default. (TARGET_INITIALIZER): Add it. * config/alpha/alpha.c (TARGET_RELAXED_ORDERING): Define. * config/ia64/ia64.c (TARGET_RELAXED_ORDERING): Define. * config/rs6000/rs6000.c (TARGET_RELAXED_ORDERING): Define. * config/sparc/sparc.c (TARGET_RELAXED_ORDERING): Define. * cp/decl.c (expand_static_init): Don't use shortcut if targetm.relaxed_ordering. From-SVN: r92659
2004-12-28 05:36:54 +01:00
// Thread support written by Jason Merrill, Red Hat Inc. <jason@redhat.com>
#include <bits/c++config.h>
#include <cxxabi.h>
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
#include <exception>
#include <new>
atomicity.h: Move to... 2006-09-13 Benjamin Kosnik <bkoz@redhat.com> * include/bits/atomicity.h: Move to... * include/ext/atomicity.h: ...here. * include/bits/concurrence.h: Move to... * include/ext/concurrence.h: ...here. * include/Makefile.am (ext_headers): Additions. (bits_headers): Subtractions. * include/Makefile.in: Regenerate. * include/ext/bitmap_allocator.h (_Mutex), __threads_enabled, _Lock, _Auto_Lock): Subsume into... * include/bits/concurrence.h (__mutex): ..this. Error check locking and unlocking. (lock): Uglify to... (__scoped_lock): Use __mutex. (__glibcxx_mutex_define_initialized): Remove. (__glibcxx_mutex_type): Remove. * include/tr1/boost_shared_ptr.h: Formating tweaks, adjustments. (_Lock_policy): Move from here... * include/ext/concurrence.h: ... to here. (__shared_ptr_default_lock_mode): To __default_lock_policy. (_S_lockfree): To _S_atomic. Document. * libsupc++/guard.cc (static_mutex): Subsume into and fixup for... * include/ext/concurrence.h (__recursive_mutex): ...this. Error check locking and unlocking. * libsupc++/eh_alloc.cc: Use __scoped_lock. * config/os/aix/atomicity.h: Fixups for include paths, mutex to __scoped_mutex change, removal of locking defines. * config/os/irix/atomicity.h: Same. * config/cpu/cris/atomicity.h: Same. * config/cpu/m68k/atomicity.h: Same. * config/cpu/hppa/atomicity.h: Same. * config/cpu/mips/atomicity.h: Same. * config/cpu/sparc/atomicity.h: Same. * config/cpu/i386/atomicity.h: Same. * config/cpu/i486/atomicity.h: Same. * config/cpu/sh/atomicity.h: Same. * config/cpu/generic/atomicity_mutex/atomicity.h: Same. * include/ext/pool_allocator.h: Same. * include/ext/bitmap_allocator.h: Same. * include/ext/rc_string_base.h: Same. * include/ext/mt_allocator.h: Same. * include/bits/locale_classes.h: Same. * include/bits/basic_string.h: Same. * include/bits/ios_base.h: Same. * include/tr1/memory: Same. * src/pool_allocator.cc: Same. * src/mt_allocator.cc: Same. * src/locale_init.cc: Same. * src/ios.cc: Same. * src/locale.cc: Same. * src/bitmap_allocator.cc: Same. * src/ios_init.cc: Same. * src/debug.cc: Same. From-SVN: r116942
2006-09-14 11:48:15 +02:00
#include <ext/atomicity.h>
#include <ext/concurrence.h>
#if defined(__GTHREADS) && defined(__GTHREAD_HAS_COND) \
&& (ATOMIC_INT_LOCK_FREE > 1) && defined(_GLIBCXX_HAVE_LINUX_FUTEX)
# include <climits>
# include <syscall.h>
# include <unistd.h>
# define _GLIBCXX_USE_FUTEX
# define _GLIBCXX_FUTEX_WAIT 0
# define _GLIBCXX_FUTEX_WAKE 1
#endif
2004-08-09 15:18:56 +02:00
// The IA64/generic ABI uses the first byte of the guard variable.
// The ARM EABI uses the least significant bit.
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
// Thread-safe static local initialization support.
#ifdef __GTHREADS
# ifndef _GLIBCXX_USE_FUTEX
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
namespace
{
atomicity.h: Move to... 2006-09-13 Benjamin Kosnik <bkoz@redhat.com> * include/bits/atomicity.h: Move to... * include/ext/atomicity.h: ...here. * include/bits/concurrence.h: Move to... * include/ext/concurrence.h: ...here. * include/Makefile.am (ext_headers): Additions. (bits_headers): Subtractions. * include/Makefile.in: Regenerate. * include/ext/bitmap_allocator.h (_Mutex), __threads_enabled, _Lock, _Auto_Lock): Subsume into... * include/bits/concurrence.h (__mutex): ..this. Error check locking and unlocking. (lock): Uglify to... (__scoped_lock): Use __mutex. (__glibcxx_mutex_define_initialized): Remove. (__glibcxx_mutex_type): Remove. * include/tr1/boost_shared_ptr.h: Formating tweaks, adjustments. (_Lock_policy): Move from here... * include/ext/concurrence.h: ... to here. (__shared_ptr_default_lock_mode): To __default_lock_policy. (_S_lockfree): To _S_atomic. Document. * libsupc++/guard.cc (static_mutex): Subsume into and fixup for... * include/ext/concurrence.h (__recursive_mutex): ...this. Error check locking and unlocking. * libsupc++/eh_alloc.cc: Use __scoped_lock. * config/os/aix/atomicity.h: Fixups for include paths, mutex to __scoped_mutex change, removal of locking defines. * config/os/irix/atomicity.h: Same. * config/cpu/cris/atomicity.h: Same. * config/cpu/m68k/atomicity.h: Same. * config/cpu/hppa/atomicity.h: Same. * config/cpu/mips/atomicity.h: Same. * config/cpu/sparc/atomicity.h: Same. * config/cpu/i386/atomicity.h: Same. * config/cpu/i486/atomicity.h: Same. * config/cpu/sh/atomicity.h: Same. * config/cpu/generic/atomicity_mutex/atomicity.h: Same. * include/ext/pool_allocator.h: Same. * include/ext/bitmap_allocator.h: Same. * include/ext/rc_string_base.h: Same. * include/ext/mt_allocator.h: Same. * include/bits/locale_classes.h: Same. * include/bits/basic_string.h: Same. * include/bits/ios_base.h: Same. * include/tr1/memory: Same. * src/pool_allocator.cc: Same. * src/mt_allocator.cc: Same. * src/locale_init.cc: Same. * src/ios.cc: Same. * src/locale.cc: Same. * src/bitmap_allocator.cc: Same. * src/ios_init.cc: Same. * src/debug.cc: Same. From-SVN: r116942
2006-09-14 11:48:15 +02:00
// A single mutex controlling all static initializations.
static __gnu_cxx::__recursive_mutex* static_mutex;
typedef char fake_recursive_mutex[sizeof(__gnu_cxx::__recursive_mutex)]
__attribute__ ((aligned(__alignof__(__gnu_cxx::__recursive_mutex))));
fake_recursive_mutex fake_mutex;
static void init()
{ static_mutex = new (&fake_mutex) __gnu_cxx::__recursive_mutex(); }
__gnu_cxx::__recursive_mutex&
get_static_mutex()
{
static __gthread_once_t once = __GTHREAD_ONCE_INIT;
__gthread_once(&once, init);
return *static_mutex;
}
// Simple wrapper for exception safety.
struct mutex_wrapper
{
bool unlock;
mutex_wrapper() : unlock(true)
{ get_static_mutex().lock(); }
~mutex_wrapper()
{
if (unlock)
static_mutex->unlock();
}
};
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
}
# endif
Add memory barriers to the double-checked locking used for static initialization. libstdc++: Add memory barriers to the double-checked locking used for static initialization. * libsupc++/guard.cc (__test_and_acquire): Define default. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE, __set_and_release) (_GLIBCXX_GUARD_SET_AND_RELEASE): Likewise. (recursion_push, recursion_pop): New abstraction functions. (__cxa_guard_acquire): Use _GLIBCXX_GUARD_TEST_AND_ACQUIRE. (__cxa_guard_release): Use _GLIBCXX_GUARD_SET_AND_RELEASE. * config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST): Rename from _GLIBCXX_GUARD_ACQUIRE and reverse sense. (_GLIBCXX_GUARD_SET): Rename from _GLIBCXX_GUARD_RELEASE. * config/cpu/arm/cxxabi_tweaks.h: Likewise. * config/cpu/alpha/atomic_word.h (_GLIBCXX_READ_MEM_BARRIER) (_GLIBCXX_WRITE_MEM_BARRIER): Define. * config/cpu/powerpc/atomic_word.h: Likewise. * config/cpu/sparc/atomic_word.h: Likewise. * config/cpu/generic/atomic_word.h: Define them, commented out. * include/bits/atomicity.h: Define defaults. * config/cpu/ia64/atomic_word.h (__test_and_acquire) (__set_and_release): New inlines. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE): Define. (_GLIBCXX_GUARD_SET_AND_RELEASE): Define. * libsupc++/guard.cc (acquire_1): Use __builtin_trap instead of abort(); gcc: * doc/tm.texi (TARGET_RELAXED_ORDERING): Document. * target.h (struct gcc_target): Add relaxed_ordering field. * target-def.h (TARGET_RELAXED_ORDERING): Define default. (TARGET_INITIALIZER): Add it. * config/alpha/alpha.c (TARGET_RELAXED_ORDERING): Define. * config/ia64/ia64.c (TARGET_RELAXED_ORDERING): Define. * config/rs6000/rs6000.c (TARGET_RELAXED_ORDERING): Define. * config/sparc/sparc.c (TARGET_RELAXED_ORDERING): Define. * cp/decl.c (expand_static_init): Don't use shortcut if targetm.relaxed_ordering. From-SVN: r92659
2004-12-28 05:36:54 +01:00
# if defined(__GTHREAD_HAS_COND) && !defined(_GLIBCXX_USE_FUTEX)
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
namespace
{
// A single condition variable controlling all static initializations.
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
static __gnu_cxx::__cond* static_cond;
// using a fake type to avoid initializing a static class.
typedef char fake_cond_t[sizeof(__gnu_cxx::__cond)]
__attribute__ ((aligned(__alignof__(__gnu_cxx::__cond))));
fake_cond_t fake_cond;
static void init_static_cond()
{ static_cond = new (&fake_cond) __gnu_cxx::__cond(); }
__gnu_cxx::__cond&
get_static_cond()
{
static __gthread_once_t once = __GTHREAD_ONCE_INIT;
__gthread_once(&once, init_static_cond);
return *static_cond;
}
}
# endif
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
# ifndef _GLIBCXX_GUARD_TEST_AND_ACQUIRE
Add memory barriers to the double-checked locking used for static initialization. libstdc++: Add memory barriers to the double-checked locking used for static initialization. * libsupc++/guard.cc (__test_and_acquire): Define default. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE, __set_and_release) (_GLIBCXX_GUARD_SET_AND_RELEASE): Likewise. (recursion_push, recursion_pop): New abstraction functions. (__cxa_guard_acquire): Use _GLIBCXX_GUARD_TEST_AND_ACQUIRE. (__cxa_guard_release): Use _GLIBCXX_GUARD_SET_AND_RELEASE. * config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST): Rename from _GLIBCXX_GUARD_ACQUIRE and reverse sense. (_GLIBCXX_GUARD_SET): Rename from _GLIBCXX_GUARD_RELEASE. * config/cpu/arm/cxxabi_tweaks.h: Likewise. * config/cpu/alpha/atomic_word.h (_GLIBCXX_READ_MEM_BARRIER) (_GLIBCXX_WRITE_MEM_BARRIER): Define. * config/cpu/powerpc/atomic_word.h: Likewise. * config/cpu/sparc/atomic_word.h: Likewise. * config/cpu/generic/atomic_word.h: Define them, commented out. * include/bits/atomicity.h: Define defaults. * config/cpu/ia64/atomic_word.h (__test_and_acquire) (__set_and_release): New inlines. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE): Define. (_GLIBCXX_GUARD_SET_AND_RELEASE): Define. * libsupc++/guard.cc (acquire_1): Use __builtin_trap instead of abort(); gcc: * doc/tm.texi (TARGET_RELAXED_ORDERING): Document. * target.h (struct gcc_target): Add relaxed_ordering field. * target-def.h (TARGET_RELAXED_ORDERING): Define default. (TARGET_INITIALIZER): Add it. * config/alpha/alpha.c (TARGET_RELAXED_ORDERING): Define. * config/ia64/ia64.c (TARGET_RELAXED_ORDERING): Define. * config/rs6000/rs6000.c (TARGET_RELAXED_ORDERING): Define. * config/sparc/sparc.c (TARGET_RELAXED_ORDERING): Define. * cp/decl.c (expand_static_init): Don't use shortcut if targetm.relaxed_ordering. From-SVN: r92659
2004-12-28 05:36:54 +01:00
inline bool
__test_and_acquire (__cxxabiv1::__guard *g)
{
bool b = _GLIBCXX_GUARD_TEST (g);
_GLIBCXX_READ_MEM_BARRIER;
return b;
}
# define _GLIBCXX_GUARD_TEST_AND_ACQUIRE(G) __test_and_acquire (G)
# endif
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
# ifndef _GLIBCXX_GUARD_SET_AND_RELEASE
Add memory barriers to the double-checked locking used for static initialization. libstdc++: Add memory barriers to the double-checked locking used for static initialization. * libsupc++/guard.cc (__test_and_acquire): Define default. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE, __set_and_release) (_GLIBCXX_GUARD_SET_AND_RELEASE): Likewise. (recursion_push, recursion_pop): New abstraction functions. (__cxa_guard_acquire): Use _GLIBCXX_GUARD_TEST_AND_ACQUIRE. (__cxa_guard_release): Use _GLIBCXX_GUARD_SET_AND_RELEASE. * config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST): Rename from _GLIBCXX_GUARD_ACQUIRE and reverse sense. (_GLIBCXX_GUARD_SET): Rename from _GLIBCXX_GUARD_RELEASE. * config/cpu/arm/cxxabi_tweaks.h: Likewise. * config/cpu/alpha/atomic_word.h (_GLIBCXX_READ_MEM_BARRIER) (_GLIBCXX_WRITE_MEM_BARRIER): Define. * config/cpu/powerpc/atomic_word.h: Likewise. * config/cpu/sparc/atomic_word.h: Likewise. * config/cpu/generic/atomic_word.h: Define them, commented out. * include/bits/atomicity.h: Define defaults. * config/cpu/ia64/atomic_word.h (__test_and_acquire) (__set_and_release): New inlines. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE): Define. (_GLIBCXX_GUARD_SET_AND_RELEASE): Define. * libsupc++/guard.cc (acquire_1): Use __builtin_trap instead of abort(); gcc: * doc/tm.texi (TARGET_RELAXED_ORDERING): Document. * target.h (struct gcc_target): Add relaxed_ordering field. * target-def.h (TARGET_RELAXED_ORDERING): Define default. (TARGET_INITIALIZER): Add it. * config/alpha/alpha.c (TARGET_RELAXED_ORDERING): Define. * config/ia64/ia64.c (TARGET_RELAXED_ORDERING): Define. * config/rs6000/rs6000.c (TARGET_RELAXED_ORDERING): Define. * config/sparc/sparc.c (TARGET_RELAXED_ORDERING): Define. * cp/decl.c (expand_static_init): Don't use shortcut if targetm.relaxed_ordering. From-SVN: r92659
2004-12-28 05:36:54 +01:00
inline void
__set_and_release (__cxxabiv1::__guard *g)
{
_GLIBCXX_WRITE_MEM_BARRIER;
_GLIBCXX_GUARD_SET (g);
}
# define _GLIBCXX_GUARD_SET_AND_RELEASE(G) __set_and_release (G)
# endif
Add memory barriers to the double-checked locking used for static initialization. libstdc++: Add memory barriers to the double-checked locking used for static initialization. * libsupc++/guard.cc (__test_and_acquire): Define default. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE, __set_and_release) (_GLIBCXX_GUARD_SET_AND_RELEASE): Likewise. (recursion_push, recursion_pop): New abstraction functions. (__cxa_guard_acquire): Use _GLIBCXX_GUARD_TEST_AND_ACQUIRE. (__cxa_guard_release): Use _GLIBCXX_GUARD_SET_AND_RELEASE. * config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST): Rename from _GLIBCXX_GUARD_ACQUIRE and reverse sense. (_GLIBCXX_GUARD_SET): Rename from _GLIBCXX_GUARD_RELEASE. * config/cpu/arm/cxxabi_tweaks.h: Likewise. * config/cpu/alpha/atomic_word.h (_GLIBCXX_READ_MEM_BARRIER) (_GLIBCXX_WRITE_MEM_BARRIER): Define. * config/cpu/powerpc/atomic_word.h: Likewise. * config/cpu/sparc/atomic_word.h: Likewise. * config/cpu/generic/atomic_word.h: Define them, commented out. * include/bits/atomicity.h: Define defaults. * config/cpu/ia64/atomic_word.h (__test_and_acquire) (__set_and_release): New inlines. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE): Define. (_GLIBCXX_GUARD_SET_AND_RELEASE): Define. * libsupc++/guard.cc (acquire_1): Use __builtin_trap instead of abort(); gcc: * doc/tm.texi (TARGET_RELAXED_ORDERING): Document. * target.h (struct gcc_target): Add relaxed_ordering field. * target-def.h (TARGET_RELAXED_ORDERING): Define default. (TARGET_INITIALIZER): Add it. * config/alpha/alpha.c (TARGET_RELAXED_ORDERING): Define. * config/ia64/ia64.c (TARGET_RELAXED_ORDERING): Define. * config/rs6000/rs6000.c (TARGET_RELAXED_ORDERING): Define. * config/sparc/sparc.c (TARGET_RELAXED_ORDERING): Define. * cp/decl.c (expand_static_init): Don't use shortcut if targetm.relaxed_ordering. From-SVN: r92659
2004-12-28 05:36:54 +01:00
#else /* !__GTHREADS */
# undef _GLIBCXX_GUARD_TEST_AND_ACQUIRE
# undef _GLIBCXX_GUARD_SET_AND_RELEASE
# define _GLIBCXX_GUARD_SET_AND_RELEASE(G) _GLIBCXX_GUARD_SET (G)
Add memory barriers to the double-checked locking used for static initialization. libstdc++: Add memory barriers to the double-checked locking used for static initialization. * libsupc++/guard.cc (__test_and_acquire): Define default. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE, __set_and_release) (_GLIBCXX_GUARD_SET_AND_RELEASE): Likewise. (recursion_push, recursion_pop): New abstraction functions. (__cxa_guard_acquire): Use _GLIBCXX_GUARD_TEST_AND_ACQUIRE. (__cxa_guard_release): Use _GLIBCXX_GUARD_SET_AND_RELEASE. * config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST): Rename from _GLIBCXX_GUARD_ACQUIRE and reverse sense. (_GLIBCXX_GUARD_SET): Rename from _GLIBCXX_GUARD_RELEASE. * config/cpu/arm/cxxabi_tweaks.h: Likewise. * config/cpu/alpha/atomic_word.h (_GLIBCXX_READ_MEM_BARRIER) (_GLIBCXX_WRITE_MEM_BARRIER): Define. * config/cpu/powerpc/atomic_word.h: Likewise. * config/cpu/sparc/atomic_word.h: Likewise. * config/cpu/generic/atomic_word.h: Define them, commented out. * include/bits/atomicity.h: Define defaults. * config/cpu/ia64/atomic_word.h (__test_and_acquire) (__set_and_release): New inlines. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE): Define. (_GLIBCXX_GUARD_SET_AND_RELEASE): Define. * libsupc++/guard.cc (acquire_1): Use __builtin_trap instead of abort(); gcc: * doc/tm.texi (TARGET_RELAXED_ORDERING): Document. * target.h (struct gcc_target): Add relaxed_ordering field. * target-def.h (TARGET_RELAXED_ORDERING): Define default. (TARGET_INITIALIZER): Add it. * config/alpha/alpha.c (TARGET_RELAXED_ORDERING): Define. * config/ia64/ia64.c (TARGET_RELAXED_ORDERING): Define. * config/rs6000/rs6000.c (TARGET_RELAXED_ORDERING): Define. * config/sparc/sparc.c (TARGET_RELAXED_ORDERING): Define. * cp/decl.c (expand_static_init): Don't use shortcut if targetm.relaxed_ordering. From-SVN: r92659
2004-12-28 05:36:54 +01:00
#endif /* __GTHREADS */
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
//
// Here are C++ run-time routines for guarded initialization of static
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
// variables. There are 4 scenarios under which these routines are called:
//
// 1. Threads not supported (__GTHREADS not defined)
// 2. Threads are supported but not enabled at run-time.
// 3. Threads enabled at run-time but __gthreads_* are not fully POSIX.
// 4. Threads enabled at run-time and __gthreads_* support all POSIX threads
// primitives we need here.
//
// The old code supported scenarios 1-3 but was broken since it used a global
// mutex for all threads and had the mutex locked during the whole duration of
// initialization of a guarded static variable. The following created a
// dead-lock with the old code.
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
//
// Thread 1 acquires the global mutex.
// Thread 1 starts initializing static variable.
// Thread 1 creates thread 2 during initialization.
// Thread 2 attempts to acquire mutex to initialize another variable.
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
// Thread 2 blocks since thread 1 is locking the mutex.
// Thread 1 waits for result from thread 2 and also blocks. A deadlock.
//
// The new code here can handle this situation and thus is more robust. However,
// we need to use the POSIX thread condition variable, which is not supported
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
// in all platforms, notably older versions of Microsoft Windows. The gthr*.h
// headers define a symbol __GTHREAD_HAS_COND for platforms that support POSIX
// like condition variables. For platforms that do not support condition
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
// variables, we need to fall back to the old code.
// If _GLIBCXX_USE_FUTEX, no global mutex or condition variable is used,
// only atomic operations are used together with futex syscall.
// Valid values of the first integer in guard are:
// 0 No thread encountered the guarded init
// yet or it has been aborted.
// _GLIBCXX_GUARD_BIT The guarded static var has been successfully
// initialized.
// _GLIBCXX_GUARD_PENDING_BIT The guarded static var is being initialized
// and no other thread is waiting for its
// initialization.
// (_GLIBCXX_GUARD_PENDING_BIT The guarded static var is being initialized
// | _GLIBCXX_GUARD_WAITING_BIT) and some other threads are waiting until
// it is initialized.
namespace __cxxabiv1
{
#ifdef _GLIBCXX_USE_FUTEX
namespace
{
static inline int __guard_test_bit (const int __byte, const int __val)
{
union { int __i; char __c[sizeof (int)]; } __u = { 0 };
__u.__c[__byte] = __val;
return __u.__i;
}
}
#endif
Add memory barriers to the double-checked locking used for static initialization. libstdc++: Add memory barriers to the double-checked locking used for static initialization. * libsupc++/guard.cc (__test_and_acquire): Define default. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE, __set_and_release) (_GLIBCXX_GUARD_SET_AND_RELEASE): Likewise. (recursion_push, recursion_pop): New abstraction functions. (__cxa_guard_acquire): Use _GLIBCXX_GUARD_TEST_AND_ACQUIRE. (__cxa_guard_release): Use _GLIBCXX_GUARD_SET_AND_RELEASE. * config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST): Rename from _GLIBCXX_GUARD_ACQUIRE and reverse sense. (_GLIBCXX_GUARD_SET): Rename from _GLIBCXX_GUARD_RELEASE. * config/cpu/arm/cxxabi_tweaks.h: Likewise. * config/cpu/alpha/atomic_word.h (_GLIBCXX_READ_MEM_BARRIER) (_GLIBCXX_WRITE_MEM_BARRIER): Define. * config/cpu/powerpc/atomic_word.h: Likewise. * config/cpu/sparc/atomic_word.h: Likewise. * config/cpu/generic/atomic_word.h: Define them, commented out. * include/bits/atomicity.h: Define defaults. * config/cpu/ia64/atomic_word.h (__test_and_acquire) (__set_and_release): New inlines. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE): Define. (_GLIBCXX_GUARD_SET_AND_RELEASE): Define. * libsupc++/guard.cc (acquire_1): Use __builtin_trap instead of abort(); gcc: * doc/tm.texi (TARGET_RELAXED_ORDERING): Document. * target.h (struct gcc_target): Add relaxed_ordering field. * target-def.h (TARGET_RELAXED_ORDERING): Define default. (TARGET_INITIALIZER): Add it. * config/alpha/alpha.c (TARGET_RELAXED_ORDERING): Define. * config/ia64/ia64.c (TARGET_RELAXED_ORDERING): Define. * config/rs6000/rs6000.c (TARGET_RELAXED_ORDERING): Define. * config/sparc/sparc.c (TARGET_RELAXED_ORDERING): Define. * cp/decl.c (expand_static_init): Don't use shortcut if targetm.relaxed_ordering. From-SVN: r92659
2004-12-28 05:36:54 +01:00
static inline int
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
init_in_progress_flag(__guard* g)
{ return ((char *)g)[1]; }
Add memory barriers to the double-checked locking used for static initialization. libstdc++: Add memory barriers to the double-checked locking used for static initialization. * libsupc++/guard.cc (__test_and_acquire): Define default. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE, __set_and_release) (_GLIBCXX_GUARD_SET_AND_RELEASE): Likewise. (recursion_push, recursion_pop): New abstraction functions. (__cxa_guard_acquire): Use _GLIBCXX_GUARD_TEST_AND_ACQUIRE. (__cxa_guard_release): Use _GLIBCXX_GUARD_SET_AND_RELEASE. * config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST): Rename from _GLIBCXX_GUARD_ACQUIRE and reverse sense. (_GLIBCXX_GUARD_SET): Rename from _GLIBCXX_GUARD_RELEASE. * config/cpu/arm/cxxabi_tweaks.h: Likewise. * config/cpu/alpha/atomic_word.h (_GLIBCXX_READ_MEM_BARRIER) (_GLIBCXX_WRITE_MEM_BARRIER): Define. * config/cpu/powerpc/atomic_word.h: Likewise. * config/cpu/sparc/atomic_word.h: Likewise. * config/cpu/generic/atomic_word.h: Define them, commented out. * include/bits/atomicity.h: Define defaults. * config/cpu/ia64/atomic_word.h (__test_and_acquire) (__set_and_release): New inlines. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE): Define. (_GLIBCXX_GUARD_SET_AND_RELEASE): Define. * libsupc++/guard.cc (acquire_1): Use __builtin_trap instead of abort(); gcc: * doc/tm.texi (TARGET_RELAXED_ORDERING): Document. * target.h (struct gcc_target): Add relaxed_ordering field. * target-def.h (TARGET_RELAXED_ORDERING): Define default. (TARGET_INITIALIZER): Add it. * config/alpha/alpha.c (TARGET_RELAXED_ORDERING): Define. * config/ia64/ia64.c (TARGET_RELAXED_ORDERING): Define. * config/rs6000/rs6000.c (TARGET_RELAXED_ORDERING): Define. * config/sparc/sparc.c (TARGET_RELAXED_ORDERING): Define. * cp/decl.c (expand_static_init): Don't use shortcut if targetm.relaxed_ordering. From-SVN: r92659
2004-12-28 05:36:54 +01:00
static inline void
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
set_init_in_progress_flag(__guard* g, int v)
{ ((char *)g)[1] = v; }
Add memory barriers to the double-checked locking used for static initialization. libstdc++: Add memory barriers to the double-checked locking used for static initialization. * libsupc++/guard.cc (__test_and_acquire): Define default. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE, __set_and_release) (_GLIBCXX_GUARD_SET_AND_RELEASE): Likewise. (recursion_push, recursion_pop): New abstraction functions. (__cxa_guard_acquire): Use _GLIBCXX_GUARD_TEST_AND_ACQUIRE. (__cxa_guard_release): Use _GLIBCXX_GUARD_SET_AND_RELEASE. * config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST): Rename from _GLIBCXX_GUARD_ACQUIRE and reverse sense. (_GLIBCXX_GUARD_SET): Rename from _GLIBCXX_GUARD_RELEASE. * config/cpu/arm/cxxabi_tweaks.h: Likewise. * config/cpu/alpha/atomic_word.h (_GLIBCXX_READ_MEM_BARRIER) (_GLIBCXX_WRITE_MEM_BARRIER): Define. * config/cpu/powerpc/atomic_word.h: Likewise. * config/cpu/sparc/atomic_word.h: Likewise. * config/cpu/generic/atomic_word.h: Define them, commented out. * include/bits/atomicity.h: Define defaults. * config/cpu/ia64/atomic_word.h (__test_and_acquire) (__set_and_release): New inlines. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE): Define. (_GLIBCXX_GUARD_SET_AND_RELEASE): Define. * libsupc++/guard.cc (acquire_1): Use __builtin_trap instead of abort(); gcc: * doc/tm.texi (TARGET_RELAXED_ORDERING): Document. * target.h (struct gcc_target): Add relaxed_ordering field. * target-def.h (TARGET_RELAXED_ORDERING): Define default. (TARGET_INITIALIZER): Add it. * config/alpha/alpha.c (TARGET_RELAXED_ORDERING): Define. * config/ia64/ia64.c (TARGET_RELAXED_ORDERING): Define. * config/rs6000/rs6000.c (TARGET_RELAXED_ORDERING): Define. * config/sparc/sparc.c (TARGET_RELAXED_ORDERING): Define. * cp/decl.c (expand_static_init): Don't use shortcut if targetm.relaxed_ordering. From-SVN: r92659
2004-12-28 05:36:54 +01:00
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
static inline void
throw_recursive_init_exception()
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
{
#ifdef __EXCEPTIONS
atomicity.h: Move to... 2006-09-13 Benjamin Kosnik <bkoz@redhat.com> * include/bits/atomicity.h: Move to... * include/ext/atomicity.h: ...here. * include/bits/concurrence.h: Move to... * include/ext/concurrence.h: ...here. * include/Makefile.am (ext_headers): Additions. (bits_headers): Subtractions. * include/Makefile.in: Regenerate. * include/ext/bitmap_allocator.h (_Mutex), __threads_enabled, _Lock, _Auto_Lock): Subsume into... * include/bits/concurrence.h (__mutex): ..this. Error check locking and unlocking. (lock): Uglify to... (__scoped_lock): Use __mutex. (__glibcxx_mutex_define_initialized): Remove. (__glibcxx_mutex_type): Remove. * include/tr1/boost_shared_ptr.h: Formating tweaks, adjustments. (_Lock_policy): Move from here... * include/ext/concurrence.h: ... to here. (__shared_ptr_default_lock_mode): To __default_lock_policy. (_S_lockfree): To _S_atomic. Document. * libsupc++/guard.cc (static_mutex): Subsume into and fixup for... * include/ext/concurrence.h (__recursive_mutex): ...this. Error check locking and unlocking. * libsupc++/eh_alloc.cc: Use __scoped_lock. * config/os/aix/atomicity.h: Fixups for include paths, mutex to __scoped_mutex change, removal of locking defines. * config/os/irix/atomicity.h: Same. * config/cpu/cris/atomicity.h: Same. * config/cpu/m68k/atomicity.h: Same. * config/cpu/hppa/atomicity.h: Same. * config/cpu/mips/atomicity.h: Same. * config/cpu/sparc/atomicity.h: Same. * config/cpu/i386/atomicity.h: Same. * config/cpu/i486/atomicity.h: Same. * config/cpu/sh/atomicity.h: Same. * config/cpu/generic/atomicity_mutex/atomicity.h: Same. * include/ext/pool_allocator.h: Same. * include/ext/bitmap_allocator.h: Same. * include/ext/rc_string_base.h: Same. * include/ext/mt_allocator.h: Same. * include/bits/locale_classes.h: Same. * include/bits/basic_string.h: Same. * include/bits/ios_base.h: Same. * include/tr1/memory: Same. * src/pool_allocator.cc: Same. * src/mt_allocator.cc: Same. * src/locale_init.cc: Same. * src/ios.cc: Same. * src/locale.cc: Same. * src/bitmap_allocator.cc: Same. * src/ios_init.cc: Same. * src/debug.cc: Same. From-SVN: r116942
2006-09-14 11:48:15 +02:00
throw __gnu_cxx::recursive_init_error();
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
#else
Add memory barriers to the double-checked locking used for static initialization. libstdc++: Add memory barriers to the double-checked locking used for static initialization. * libsupc++/guard.cc (__test_and_acquire): Define default. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE, __set_and_release) (_GLIBCXX_GUARD_SET_AND_RELEASE): Likewise. (recursion_push, recursion_pop): New abstraction functions. (__cxa_guard_acquire): Use _GLIBCXX_GUARD_TEST_AND_ACQUIRE. (__cxa_guard_release): Use _GLIBCXX_GUARD_SET_AND_RELEASE. * config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST): Rename from _GLIBCXX_GUARD_ACQUIRE and reverse sense. (_GLIBCXX_GUARD_SET): Rename from _GLIBCXX_GUARD_RELEASE. * config/cpu/arm/cxxabi_tweaks.h: Likewise. * config/cpu/alpha/atomic_word.h (_GLIBCXX_READ_MEM_BARRIER) (_GLIBCXX_WRITE_MEM_BARRIER): Define. * config/cpu/powerpc/atomic_word.h: Likewise. * config/cpu/sparc/atomic_word.h: Likewise. * config/cpu/generic/atomic_word.h: Define them, commented out. * include/bits/atomicity.h: Define defaults. * config/cpu/ia64/atomic_word.h (__test_and_acquire) (__set_and_release): New inlines. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE): Define. (_GLIBCXX_GUARD_SET_AND_RELEASE): Define. * libsupc++/guard.cc (acquire_1): Use __builtin_trap instead of abort(); gcc: * doc/tm.texi (TARGET_RELAXED_ORDERING): Document. * target.h (struct gcc_target): Add relaxed_ordering field. * target-def.h (TARGET_RELAXED_ORDERING): Define default. (TARGET_INITIALIZER): Add it. * config/alpha/alpha.c (TARGET_RELAXED_ORDERING): Define. * config/ia64/ia64.c (TARGET_RELAXED_ORDERING): Define. * config/rs6000/rs6000.c (TARGET_RELAXED_ORDERING): Define. * config/sparc/sparc.c (TARGET_RELAXED_ORDERING): Define. * cp/decl.c (expand_static_init): Don't use shortcut if targetm.relaxed_ordering. From-SVN: r92659
2004-12-28 05:36:54 +01:00
// Use __builtin_trap so we don't require abort().
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
__builtin_trap();
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
#endif
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
}
// acquire() is a helper function used to acquire guard if thread support is
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
// not compiled in or is compiled in but not enabled at run-time.
static int
acquire(__guard *g)
{
// Quit if the object is already initialized.
if (_GLIBCXX_GUARD_TEST(g))
return 0;
if (init_in_progress_flag(g))
throw_recursive_init_exception();
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
set_init_in_progress_flag(g, 1);
Add memory barriers to the double-checked locking used for static initialization. libstdc++: Add memory barriers to the double-checked locking used for static initialization. * libsupc++/guard.cc (__test_and_acquire): Define default. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE, __set_and_release) (_GLIBCXX_GUARD_SET_AND_RELEASE): Likewise. (recursion_push, recursion_pop): New abstraction functions. (__cxa_guard_acquire): Use _GLIBCXX_GUARD_TEST_AND_ACQUIRE. (__cxa_guard_release): Use _GLIBCXX_GUARD_SET_AND_RELEASE. * config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST): Rename from _GLIBCXX_GUARD_ACQUIRE and reverse sense. (_GLIBCXX_GUARD_SET): Rename from _GLIBCXX_GUARD_RELEASE. * config/cpu/arm/cxxabi_tweaks.h: Likewise. * config/cpu/alpha/atomic_word.h (_GLIBCXX_READ_MEM_BARRIER) (_GLIBCXX_WRITE_MEM_BARRIER): Define. * config/cpu/powerpc/atomic_word.h: Likewise. * config/cpu/sparc/atomic_word.h: Likewise. * config/cpu/generic/atomic_word.h: Define them, commented out. * include/bits/atomicity.h: Define defaults. * config/cpu/ia64/atomic_word.h (__test_and_acquire) (__set_and_release): New inlines. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE): Define. (_GLIBCXX_GUARD_SET_AND_RELEASE): Define. * libsupc++/guard.cc (acquire_1): Use __builtin_trap instead of abort(); gcc: * doc/tm.texi (TARGET_RELAXED_ORDERING): Document. * target.h (struct gcc_target): Add relaxed_ordering field. * target-def.h (TARGET_RELAXED_ORDERING): Define default. (TARGET_INITIALIZER): Add it. * config/alpha/alpha.c (TARGET_RELAXED_ORDERING): Define. * config/ia64/ia64.c (TARGET_RELAXED_ORDERING): Define. * config/rs6000/rs6000.c (TARGET_RELAXED_ORDERING): Define. * config/sparc/sparc.c (TARGET_RELAXED_ORDERING): Define. * cp/decl.c (expand_static_init): Don't use shortcut if targetm.relaxed_ordering. From-SVN: r92659
2004-12-28 05:36:54 +01:00
return 1;
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
}
Add memory barriers to the double-checked locking used for static initialization. libstdc++: Add memory barriers to the double-checked locking used for static initialization. * libsupc++/guard.cc (__test_and_acquire): Define default. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE, __set_and_release) (_GLIBCXX_GUARD_SET_AND_RELEASE): Likewise. (recursion_push, recursion_pop): New abstraction functions. (__cxa_guard_acquire): Use _GLIBCXX_GUARD_TEST_AND_ACQUIRE. (__cxa_guard_release): Use _GLIBCXX_GUARD_SET_AND_RELEASE. * config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST): Rename from _GLIBCXX_GUARD_ACQUIRE and reverse sense. (_GLIBCXX_GUARD_SET): Rename from _GLIBCXX_GUARD_RELEASE. * config/cpu/arm/cxxabi_tweaks.h: Likewise. * config/cpu/alpha/atomic_word.h (_GLIBCXX_READ_MEM_BARRIER) (_GLIBCXX_WRITE_MEM_BARRIER): Define. * config/cpu/powerpc/atomic_word.h: Likewise. * config/cpu/sparc/atomic_word.h: Likewise. * config/cpu/generic/atomic_word.h: Define them, commented out. * include/bits/atomicity.h: Define defaults. * config/cpu/ia64/atomic_word.h (__test_and_acquire) (__set_and_release): New inlines. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE): Define. (_GLIBCXX_GUARD_SET_AND_RELEASE): Define. * libsupc++/guard.cc (acquire_1): Use __builtin_trap instead of abort(); gcc: * doc/tm.texi (TARGET_RELAXED_ORDERING): Document. * target.h (struct gcc_target): Add relaxed_ordering field. * target-def.h (TARGET_RELAXED_ORDERING): Define default. (TARGET_INITIALIZER): Add it. * config/alpha/alpha.c (TARGET_RELAXED_ORDERING): Define. * config/ia64/ia64.c (TARGET_RELAXED_ORDERING): Define. * config/rs6000/rs6000.c (TARGET_RELAXED_ORDERING): Define. * config/sparc/sparc.c (TARGET_RELAXED_ORDERING): Define. * cp/decl.c (expand_static_init): Don't use shortcut if targetm.relaxed_ordering. From-SVN: r92659
2004-12-28 05:36:54 +01:00
extern "C"
int __cxa_guard_acquire (__guard *g)
{
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
#ifdef __GTHREADS
Add memory barriers to the double-checked locking used for static initialization. libstdc++: Add memory barriers to the double-checked locking used for static initialization. * libsupc++/guard.cc (__test_and_acquire): Define default. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE, __set_and_release) (_GLIBCXX_GUARD_SET_AND_RELEASE): Likewise. (recursion_push, recursion_pop): New abstraction functions. (__cxa_guard_acquire): Use _GLIBCXX_GUARD_TEST_AND_ACQUIRE. (__cxa_guard_release): Use _GLIBCXX_GUARD_SET_AND_RELEASE. * config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST): Rename from _GLIBCXX_GUARD_ACQUIRE and reverse sense. (_GLIBCXX_GUARD_SET): Rename from _GLIBCXX_GUARD_RELEASE. * config/cpu/arm/cxxabi_tweaks.h: Likewise. * config/cpu/alpha/atomic_word.h (_GLIBCXX_READ_MEM_BARRIER) (_GLIBCXX_WRITE_MEM_BARRIER): Define. * config/cpu/powerpc/atomic_word.h: Likewise. * config/cpu/sparc/atomic_word.h: Likewise. * config/cpu/generic/atomic_word.h: Define them, commented out. * include/bits/atomicity.h: Define defaults. * config/cpu/ia64/atomic_word.h (__test_and_acquire) (__set_and_release): New inlines. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE): Define. (_GLIBCXX_GUARD_SET_AND_RELEASE): Define. * libsupc++/guard.cc (acquire_1): Use __builtin_trap instead of abort(); gcc: * doc/tm.texi (TARGET_RELAXED_ORDERING): Document. * target.h (struct gcc_target): Add relaxed_ordering field. * target-def.h (TARGET_RELAXED_ORDERING): Define default. (TARGET_INITIALIZER): Add it. * config/alpha/alpha.c (TARGET_RELAXED_ORDERING): Define. * config/ia64/ia64.c (TARGET_RELAXED_ORDERING): Define. * config/rs6000/rs6000.c (TARGET_RELAXED_ORDERING): Define. * config/sparc/sparc.c (TARGET_RELAXED_ORDERING): Define. * cp/decl.c (expand_static_init): Don't use shortcut if targetm.relaxed_ordering. From-SVN: r92659
2004-12-28 05:36:54 +01:00
// If the target can reorder loads, we need to insert a read memory
// barrier so that accesses to the guarded variable happen after the
// guard test.
if (_GLIBCXX_GUARD_TEST_AND_ACQUIRE (g))
return 0;
# ifdef _GLIBCXX_USE_FUTEX
// If __atomic_* and futex syscall are supported, don't use any global
// mutex.
if (__gthread_active_p ())
{
int *gi = (int *) (void *) g;
const int guard_bit = _GLIBCXX_GUARD_BIT;
const int pending_bit = _GLIBCXX_GUARD_PENDING_BIT;
const int waiting_bit = _GLIBCXX_GUARD_WAITING_BIT;
while (1)
{
int expected(0);
if (__atomic_compare_exchange_n(gi, &expected, pending_bit, false,
__ATOMIC_ACQ_REL,
__ATOMIC_ACQUIRE))
{
// This thread should do the initialization.
return 1;
}
if (expected == guard_bit)
{
// Already initialized.
return 0;
}
if (expected == pending_bit)
{
// Use acquire here.
int newv = expected | waiting_bit;
if (!__atomic_compare_exchange_n(gi, &expected, newv, false,
__ATOMIC_ACQ_REL,
__ATOMIC_ACQUIRE))
{
if (expected == guard_bit)
{
// Make a thread that failed to set the
// waiting bit exit the function earlier,
// if it detects that another thread has
// successfully finished initialising.
return 0;
}
if (expected == 0)
continue;
}
expected = newv;
}
syscall (SYS_futex, gi, _GLIBCXX_FUTEX_WAIT, expected, 0);
}
}
# else
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
if (__gthread_active_p ())
{
mutex_wrapper mw;
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
while (1) // When this loop is executing, mutex is locked.
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
{
# ifdef __GTHREAD_HAS_COND
// The static is already initialized.
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
if (_GLIBCXX_GUARD_TEST(g))
return 0; // The mutex will be unlocked via wrapper
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
if (init_in_progress_flag(g))
{
// The guarded static is currently being initialized by
// another thread, so we release mutex and wait for the
// condition variable. We will lock the mutex again after
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
// this.
get_static_cond().wait_recursive(&get_static_mutex());
}
else
{
set_init_in_progress_flag(g, 1);
return 1; // The mutex will be unlocked via wrapper.
}
# else
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
// This provides compatibility with older systems not supporting
// POSIX like condition variables.
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
if (acquire(g))
{
mw.unlock = false;
return 1; // The mutex still locked.
}
return 0; // The mutex will be unlocked via wrapper.
# endif
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
}
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
}
# endif
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
#endif
return acquire (g);
}
extern "C"
void __cxa_guard_abort (__guard *g) throw ()
{
#ifdef _GLIBCXX_USE_FUTEX
// If __atomic_* and futex syscall are supported, don't use any global
// mutex.
if (__gthread_active_p ())
{
int *gi = (int *) (void *) g;
const int waiting_bit = _GLIBCXX_GUARD_WAITING_BIT;
int old = __atomic_exchange_n (gi, 0, __ATOMIC_ACQ_REL);
if ((old & waiting_bit) != 0)
syscall (SYS_futex, gi, _GLIBCXX_FUTEX_WAKE, INT_MAX);
return;
}
#elif defined(__GTHREAD_HAS_COND)
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
if (__gthread_active_p())
{
mutex_wrapper mw;
set_init_in_progress_flag(g, 0);
// If we abort, we still need to wake up all other threads waiting for
// the condition variable.
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
get_static_cond().broadcast();
return;
}
#endif
set_init_in_progress_flag(g, 0);
#if defined(__GTHREADS) && !defined(__GTHREAD_HAS_COND)
// This provides compatibility with older systems not supporting POSIX like
// condition variables.
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
if (__gthread_active_p ())
static_mutex->unlock();
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
#endif
}
extern "C"
void __cxa_guard_release (__guard *g) throw ()
{
#ifdef _GLIBCXX_USE_FUTEX
// If __atomic_* and futex syscall are supported, don't use any global
// mutex.
if (__gthread_active_p ())
{
int *gi = (int *) (void *) g;
const int guard_bit = _GLIBCXX_GUARD_BIT;
const int waiting_bit = _GLIBCXX_GUARD_WAITING_BIT;
int old = __atomic_exchange_n (gi, guard_bit, __ATOMIC_ACQ_REL);
if ((old & waiting_bit) != 0)
syscall (SYS_futex, gi, _GLIBCXX_FUTEX_WAKE, INT_MAX);
return;
}
#elif defined(__GTHREAD_HAS_COND)
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
if (__gthread_active_p())
{
mutex_wrapper mw;
set_init_in_progress_flag(g, 0);
_GLIBCXX_GUARD_SET_AND_RELEASE(g);
get_static_cond().broadcast();
return;
}
#endif
set_init_in_progress_flag(g, 0);
Add memory barriers to the double-checked locking used for static initialization. libstdc++: Add memory barriers to the double-checked locking used for static initialization. * libsupc++/guard.cc (__test_and_acquire): Define default. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE, __set_and_release) (_GLIBCXX_GUARD_SET_AND_RELEASE): Likewise. (recursion_push, recursion_pop): New abstraction functions. (__cxa_guard_acquire): Use _GLIBCXX_GUARD_TEST_AND_ACQUIRE. (__cxa_guard_release): Use _GLIBCXX_GUARD_SET_AND_RELEASE. * config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST): Rename from _GLIBCXX_GUARD_ACQUIRE and reverse sense. (_GLIBCXX_GUARD_SET): Rename from _GLIBCXX_GUARD_RELEASE. * config/cpu/arm/cxxabi_tweaks.h: Likewise. * config/cpu/alpha/atomic_word.h (_GLIBCXX_READ_MEM_BARRIER) (_GLIBCXX_WRITE_MEM_BARRIER): Define. * config/cpu/powerpc/atomic_word.h: Likewise. * config/cpu/sparc/atomic_word.h: Likewise. * config/cpu/generic/atomic_word.h: Define them, commented out. * include/bits/atomicity.h: Define defaults. * config/cpu/ia64/atomic_word.h (__test_and_acquire) (__set_and_release): New inlines. (_GLIBCXX_GUARD_TEST_AND_ACQUIRE): Define. (_GLIBCXX_GUARD_SET_AND_RELEASE): Define. * libsupc++/guard.cc (acquire_1): Use __builtin_trap instead of abort(); gcc: * doc/tm.texi (TARGET_RELAXED_ORDERING): Document. * target.h (struct gcc_target): Add relaxed_ordering field. * target-def.h (TARGET_RELAXED_ORDERING): Define default. (TARGET_INITIALIZER): Add it. * config/alpha/alpha.c (TARGET_RELAXED_ORDERING): Define. * config/ia64/ia64.c (TARGET_RELAXED_ORDERING): Define. * config/rs6000/rs6000.c (TARGET_RELAXED_ORDERING): Define. * config/sparc/sparc.c (TARGET_RELAXED_ORDERING): Define. * cp/decl.c (expand_static_init): Don't use shortcut if targetm.relaxed_ordering. From-SVN: r92659
2004-12-28 05:36:54 +01:00
_GLIBCXX_GUARD_SET_AND_RELEASE (g);
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
#if defined(__GTHREADS) && !defined(__GTHREAD_HAS_COND)
// This provides compatibility with older systems not supporting POSIX like
// condition variables.
gthr-posix.h (__gthread_cond_broadcast, [...]): Add to extend interface for POSIX conditional variables. 2007-09-13 Doug Kwan <dougkwan@google.com> * gcc/gthr-posix.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-posix95.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. (__GTHREAD_HAS_COND): Macro defined to signify support of conditional variables. * gcc/gthr-single.h (__gthread_cond_broadcast, __gthread_cond_wait, __gthread_cond_wait_recursive): Add to extend interface for POSIX conditional variables. * gcc/gthr.h: Update comments to document new interface. * libstdc++-v3/include/ext/concurrent.h (class __mutex, class __recursive_mutex): Add new method gthread_mutex to access inner gthread mutex. [__GTHREAD_HAS_COND] (class __concurrence_broadcast_error, class __concurrence_wait_error, class __cond): Add. * guard.cc (recursive_push, recursive_pop): Delete. (init_in_progress_flag, set_init_in_progress_flag): Add to replace recursive_push and recursive_pop. (throw_recursive_init_exception): Add. (acquire, __cxa_guard_acquire, __cxa_guard_abort and __cxa_guard_release): [__GTHREAD_HAS_COND] Use a conditional for synchronization of static variable initialization. The global mutex is only held briefly when guards are accessed. [!__GTHREAD_HAS_COND] Fall back to the old code, which deadlocks. * testsuite/thread/guard.cc: Add new test. It deadlocks with the old locking code in libstdc++-v3/libsup++/guard.cc. From-SVN: r129030
2007-10-05 07:35:46 +02:00
if (__gthread_active_p())
static_mutex->unlock();
re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads) PR c++/13684 * cp/decl.c (expand_static_init): Use thread-safety API. (register_dtor_fn): Return the call, don't expand it. * cp/tree.c (add_stmt_to_compound): New fn. (stabilize_call): Use it. * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY. (gimple_push_cleanup): Add eh_only parm. (gimplify_target_expr): Pass it. * c.opt (-fno-threadsafe-statics): New option. * c-opts.c (c_common_handle_option): Handle it. * c-common.h (flag_threadsafe_statics): Declare it. * c-common.c (flag_threadsafe_statics): Record it. * doc/invoke.texi: Document it. * tsystem.h (_GNU_SOURCE): Define. * gthr-posix.h (__gthread_recursive_mutex_t): New typedef. (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro. (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro. (__gthread_recursive_mutex_init_function): New fn. (__gthread_recursive_mutex_lock): New fn. (__gthread_recursive_mutex_trylock): New fn. (__gthread_recursive_mutex_unlock): New fn. * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise. * gthr-win32.h, gthr-vxworks.h: Likewise. * gthr.h: Document. * libsupc++/guard.cc (static_mutex): Internal class implementing a recursive mutex which controls initialization of local statics. (__gnu_cxx::recursive_init): New exception class. (__cxa_guard_acquire): Deal with locking and recursion detection. (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise. From-SVN: r86687
2004-08-28 04:33:54 +02:00
#endif
}
}