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Author SHA1 Message Date
Jason Merrill 445cf5eb0d 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
 2004-12-27 23:36:54 -05:00
Jason Merrill 40aac94801 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
 2004-08-27 22:33:54 -04:00
Jason Merrill 27f577e57d fix typo 
From-SVN: r85715
 2004-08-09 09:18:56 -04:00
Paul Brook 1568430fae configure.ac: Set ABI_TWEAKS_SRCDIR. 
* configure.ac: Set ABI_TWEAKS_SRCDIR.
	* configure.host: Set abi_tweaks_dir.  Check for atomicity.h when
	setting atomicity_dir.  Override type_cpu for arm based targets.
	* include/Makefile.am (host_headers): Add cxxabi_tweaks.h.
	* libsupc++/cxxabi.h: Include bits/cxxabi.h. Don't declare __guard.
	* libsupc++/guard.cc: Use definitions from cxxabi_tweaks.h.
	* libsupc++/vec.cc: Ditto.
	* config/cpu/arm/cxxabi_tweaks.h: New file.
	* config/cpu/generic/cxxabi_tweaks.h: New file.
	* */Makefile.in: Regenerate.
	* configure: Regenerate.

From-SVN: r84032
 2004-07-02 23:40:19 +00:00
Paul Brook 4185ae5397 target-def.h (TARGET_CXX_GUARD_TYPE, [...]): Define. 
gcc/
	* target-def.h (TARGET_CXX_GUARD_TYPE, TARGET_CXX_GUARD_MASK_BIT,
	TARGET_CXX): Define.
	(TARGET_INITIALIZER): Use TARGET_CXX.
	* target.h (struct gcc_target): Add struct cxx.
	* targhooks.h (default_cxx_guard_type): Add prototype.
	* targhooks.c (default_cxx_guard_type): New function.
	* config/arm/arm.c (TARGET_CXX_GUARD_TYPE, TARGET_CXX_GUARD_MASK_BIT):
	Define.
	(arm_cxx_guard_type, arm_cxx_guard_mask_bit): New functions.
	* doc/tm.texi: Document TARGET_CXX_GUARD_TYPE and
	TARGET_CXX_GUARD_MASK_BIT.
gcc/cp/
	* decl2.c (get_guard): Call targetm.cxx.guard_type.
	(get_guard_bits, get_guard_cond): Call targetm.cxx.guard_mask_bit.
libstdc++/
	* libsupc++/cxxabi.h: Define __ARM_EABI__
	(__guard): Use it.
	* libsupc++/guard.h (__cxa_guard_acquire, __cxa_guard_release): Ditto.

From-SVN: r83660
 2004-06-25 17:15:46 +00:00
Mark Mitchell c4f6640537 Makefile.am (sources): Add guard.cc. 
* libsupc++/Makefile.am (sources): Add guard.cc.
	* libsupc++/Makefile.in: Regenerated.
	* libsupc++/cxxabi.h (__cxa_guard_acquire): New function.
	(__cxa_guard_release): Likewise.
	(__cxa_guard_abort): Likewise.
	* libsupc++/guard.cc: New file.

From-SVN: r59475
 2002-11-25 23:17:31 +00:00