configure.ac (--enable-linux-futex): Add new configure option.
libstdc++-v3/ * configure.ac (--enable-linux-futex): Add new configure option. (HAVE_LINUX_FUTEX): New AC_DEFINE. * Makefile.in: Rebuilt. * aclocal.m4: Rebuilt. * configure: Rebuilt. * config.h.in: Rebuilt. * config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_BIT, _GLIBCXX_GUARD_PENDING_BIT, _GLIBCXX_GUARD_WAITING_BIT): Define. * config/cpu/arm/cxxabi_tweaks.h (_GLIBCXX_GUARD_BIT, _GLIBCXX_GUARD_PENDING_BIT, _GLIBCXX_GUARD_WAITING_BIT): Define. * libsupc++/guard.cc: Include climits and syscall.h. (_GLIBCXX_USE_FUTEX): Define if futex syscall and atomic builtins are supported. (_GLIBCXX_FUTEX_WAIT, _GLIBCXX_FUTEX_WAKE): Likewise. (__guard_test_bit): New static inline. (__cxa_guard_acquire, __cxa_guard_release, __cxa_guard_abort): Use atomic builtins and futex syscall if _GLIBCXX_USE_FUTEX. config/ * futex.m4: New file. libgomp/ * configure.ac: Move futex checking into ../config/futex.m4. * configure: Rebuilt. * aclocal.m4: Rebuilt. * Makefile.in: Rebuilt. * configure.tgt: Rename have_tls to gcc_cv_have_tls to match 2007-10-15 ../config/tls.m4 change. From-SVN: r131399
This commit is contained in:
Jakub Jelinek
Jakub Jelinek
parent
c90eee444c
commit
0f3e711eef
@ -1,3 +1,7 @@
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2008-01-08 Jakub Jelinek <jakub@redhat.com>
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* futex.m4: New file.
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2007-12-06 Richard Sandiford <rsandifo@nildram.co.uk>
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* mt-sde (CFLAGS_FOR_TARGET, CXXFLAGS_FOR_TARGET): Use +=, not =.
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64
config/futex.m4
Normal file
64
config/futex.m4
Normal file
@ -0,0 +1,64 @@
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dnl ----------------------------------------------------------------------
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dnl This whole bit snagged from libgomp.
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dnl
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dnl GCC_LINUX_FUTEX
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dnl (SHELL-CODE_HANDLER)
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dnl
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AC_DEFUN([GCC_LINUX_FUTEX],[dnl
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GCC_ENABLE(linux-futex,default, ,[use the Linux futex system call],
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permit yes|no|default)
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case "$target" in
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*-linux*)
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case "$enable_linux_futex" in
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default)
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# If headers don't have gettid/futex syscalls definition, then
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# default to no, otherwise there will be compile time failures.
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# Otherwise, default to yes. If we don't detect we are
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# compiled/linked against NPTL and not cross-compiling, check
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# if programs are run by default against NPTL and if not, issue
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# a warning.
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enable_linux_futex=no
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[#include <sys/syscall.h>
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int lk;],
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[syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])],
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[save_LIBS="$LIBS"
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LIBS="-lpthread $LIBS"
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[#ifndef _GNU_SOURCE
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#define _GNU_SOURCE 1
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#endif
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#include <pthread.h>
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pthread_t th; void *status;],
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[pthread_tryjoin_np (th, &status);])],[enable_linux_futex=yes],
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[if test x$cross_compiling = xno; then
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if getconf GNU_LIBPTHREAD_VERSION 2>/dev/null \
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| LC_ALL=C grep -i NPTL > /dev/null 2>/dev/null; then :; else
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AC_MSG_WARN([The kernel might not support futex or gettid syscalls.
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If so, please configure with --disable-linux-futex])
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fi
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fi
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enable_linux_futex=yes])
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LIBS="$save_LIBS"])
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;;
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yes)
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[#include <sys/syscall.h>
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int lk;],
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[syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])],[],
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[AC_MSG_ERROR([SYS_gettid and SYS_futex required for --enable-linux-futex])])
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;;
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esac
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;;
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*)
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enable_linux_futex=no
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;;
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esac
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if test x$enable_linux_futex = xyes; then
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$1
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fi
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])
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@ -1,3 +1,13 @@
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2008-01-08 Jakub Jelinek <jakub@redhat.com>
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* configure.ac: Move futex checking into ../config/futex.m4.
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* configure: Rebuilt.
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* aclocal.m4: Rebuilt.
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* Makefile.in: Rebuilt.
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* configure.tgt: Rename have_tls to gcc_cv_have_tls to match
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2007-10-15 ../config/tls.m4 change.
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2007-12-19 Jakub Jelinek <jakub@redhat.com>
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PR c++/34513
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@ -55,7 +55,8 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
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$(top_srcdir)/../config/lead-dot.m4 \
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$(top_srcdir)/../config/multi.m4 \
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$(top_srcdir)/../config/stdint.m4 \
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$(top_srcdir)/../config/tls.m4 $(top_srcdir)/../ltoptions.m4 \
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$(top_srcdir)/../config/tls.m4 \
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$(top_srcdir)/../config/futex.m4 $(top_srcdir)/../ltoptions.m4 \
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$(top_srcdir)/../ltsugar.m4 $(top_srcdir)/../ltversion.m4 \
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$(top_srcdir)/../lt~obsolete.m4 $(top_srcdir)/acinclude.m4 \
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$(top_srcdir)/../libtool.m4 $(top_srcdir)/configure.ac
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1
libgomp/aclocal.m4
vendored
1
libgomp/aclocal.m4
vendored
@ -863,6 +863,7 @@ m4_include([../config/lead-dot.m4])
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m4_include([../config/multi.m4])
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m4_include([../config/stdint.m4])
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m4_include([../config/tls.m4])
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m4_include([../config/futex.m4])
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m4_include([../ltoptions.m4])
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m4_include([../ltsugar.m4])
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m4_include([../ltversion.m4])
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58
libgomp/configure
vendored
58
libgomp/configure
vendored
@ -1003,8 +1003,6 @@ Optional Features:
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--enable-version-specific-runtime-libs
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Specify that runtime libraries should be installed
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in a compiler-specific directory [default=no]
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--enable-linux-futex Use the Linux futex system call
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[default=default]
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--enable-generated-files-in-srcdir
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put copies of generated files in source dir intended
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for creating source tarballs for users without
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@ -1021,6 +1019,8 @@ Optional Features:
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--disable-libtool-lock avoid locking (might break parallel builds)
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--enable-maintainer-mode enable make rules and dependencies not useful
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(and sometimes confusing) to the casual installer
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--enable-linux-futex use the Linux futex system call
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[default=default]
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--enable-tls Use thread-local storage [default=yes]
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--enable-symvers=STYLE enables symbol versioning of the shared library
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[default=yes]
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@ -1518,26 +1518,6 @@ fi;
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echo "$as_me:$LINENO: result: $enable_version_specific_runtime_libs" >&5
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echo "${ECHO_T}$enable_version_specific_runtime_libs" >&6
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echo "$as_me:$LINENO: checking for --enable-linux-futex" >&5
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echo $ECHO_N "checking for --enable-linux-futex... $ECHO_C" >&6
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# Check whether --enable-linux-futex or --disable-linux-futex was given.
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if test "${enable_linux_futex+set}" = set; then
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enableval="$enable_linux_futex"
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case "$enableval" in
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yes|no|default) ;;
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*) { { echo "$as_me:$LINENO: error: Unknown argument to enable/disable linux-futex" >&5
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echo "$as_me: error: Unknown argument to enable/disable linux-futex" >&2;}
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{ (exit 1); exit 1; }; } ;;
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esac
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else
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enable_linux_futex=default
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fi;
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echo "$as_me:$LINENO: result: $enable_linux_futex" >&5
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echo "${ECHO_T}$enable_linux_futex" >&6
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# We would like our source tree to be readonly. However when releases or
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# pre-releases are generated, the flex/bison generated files as well as the
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# various formats of manuals need to be included along with the rest of the
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@ -16661,6 +16641,24 @@ cat >>confdefs.h <<\_ACEOF
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_ACEOF
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;;
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esac
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# Check whether --enable-linux-futex or --disable-linux-futex was given.
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if test "${enable_linux_futex+set}" = set; then
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enableval="$enable_linux_futex"
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case "$enableval" in
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yes|no|default) ;;
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*) { { echo "$as_me:$LINENO: error: Unknown argument to enable/disable linux-futex" >&5
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echo "$as_me: error: Unknown argument to enable/disable linux-futex" >&2;}
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{ (exit 1); exit 1; }; } ;;
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esac
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else
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enable_linux_futex=default
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fi;
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case "$target" in
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*-linux*)
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case "$enable_linux_futex" in
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default)
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@ -16709,7 +16707,9 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }; then
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cat >conftest.$ac_ext <<_ACEOF
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save_LIBS="$LIBS"
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LIBS="-lpthread $LIBS"
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cat >conftest.$ac_ext <<_ACEOF
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/* confdefs.h. */
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_ACEOF
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cat confdefs.h >>conftest.$ac_ext
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@ -16757,7 +16757,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
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if test x$cross_compiling = xno; then
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if getconf GNU_LIBPTHREAD_VERSION 2>/dev/null \
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| LC_ALL=C grep -i NPTL > /dev/null 2>/dev/null; then
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| LC_ALL=C grep -i NPTL > /dev/null 2>/dev/null; then :; else
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{ echo "$as_me:$LINENO: WARNING: The kernel might not support futex or gettid syscalls.
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If so, please configure with --disable-linux-futex" >&5
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echo "$as_me: WARNING: The kernel might not support futex or gettid syscalls.
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@ -16768,6 +16768,7 @@ If so, please configure with --disable-linux-futex" >&2;}
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fi
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rm -f conftest.err conftest.$ac_objext \
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conftest$ac_exeext conftest.$ac_ext
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LIBS="$save_LIBS"
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else
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echo "$as_me: failed program was:" >&5
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sed 's/^/| /' conftest.$ac_ext >&5
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@ -16776,7 +16777,7 @@ fi
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rm -f conftest.err conftest.$ac_objext \
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conftest$ac_exeext conftest.$ac_ext
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;;
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yes)
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yes)
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cat >conftest.$ac_ext <<_ACEOF
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/* confdefs.h. */
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_ACEOF
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@ -16829,7 +16830,14 @@ rm -f conftest.err conftest.$ac_objext \
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;;
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esac
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;;
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*)
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enable_linux_futex=no
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;;
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||||
esac
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||||
if test x$enable_linux_futex = xyes; then
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:
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||||
fi
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# Check for pthread_{,attr_}[sg]etaffinity_np.
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cat >conftest.$ac_ext <<_ACEOF
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@ -15,12 +15,6 @@ LIBGOMP_ENABLE(version-specific-runtime-libs, no, ,
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permit yes|no)
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AC_MSG_RESULT($enable_version_specific_runtime_libs)
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|
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AC_MSG_CHECKING([for --enable-linux-futex])
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LIBGOMP_ENABLE(linux-futex, default, ,
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[Use the Linux futex system call],
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||||
permit yes|no|default)
|
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AC_MSG_RESULT($enable_linux_futex)
|
||||
|
||||
# We would like our source tree to be readonly. However when releases or
|
||||
# pre-releases are generated, the flex/bison generated files as well as the
|
||||
# various formats of manuals need to be included along with the rest of the
|
||||
@ -192,50 +186,10 @@ case "$host" in
|
||||
AC_DEFINE(HAVE_BROKEN_POSIX_SEMAPHORES, 1,
|
||||
Define if the POSIX Semaphores do not work on your system.)
|
||||
;;
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||||
*-linux*)
|
||||
case "$enable_linux_futex" in
|
||||
default)
|
||||
# If headers don't have gettid/futex syscalls definition, then
|
||||
# default to no, otherwise there will be compile time failures.
|
||||
# Otherwise, default to yes. If we don't detect we are
|
||||
# compiled/linked against NPTL and not cross-compiling, check
|
||||
# if programs are run by default against NPTL and if not, issue
|
||||
# a warning.
|
||||
enable_linux_futex=no
|
||||
AC_LINK_IFELSE(
|
||||
[AC_LANG_PROGRAM(
|
||||
[#include <sys/syscall.h>
|
||||
int lk;],
|
||||
[syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])],
|
||||
[AC_LINK_IFELSE(
|
||||
[AC_LANG_PROGRAM(
|
||||
[#ifndef _GNU_SOURCE
|
||||
#define _GNU_SOURCE 1
|
||||
#endif
|
||||
#include <pthread.h>
|
||||
pthread_t th; void *status;],
|
||||
[pthread_tryjoin_np (th, &status);])],[enable_linux_futex=yes],
|
||||
[if test x$cross_compiling = xno; then
|
||||
if getconf GNU_LIBPTHREAD_VERSION 2>/dev/null \
|
||||
| LC_ALL=C grep -i NPTL > /dev/null 2>/dev/null; then
|
||||
AC_MSG_WARN([The kernel might not support futex or gettid syscalls.
|
||||
If so, please configure with --disable-linux-futex])
|
||||
fi
|
||||
fi
|
||||
enable_linux_futex=yes])])
|
||||
;;
|
||||
yes)
|
||||
AC_LINK_IFELSE(
|
||||
[AC_LANG_PROGRAM(
|
||||
[#include <sys/syscall.h>
|
||||
int lk;],
|
||||
[syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])],[],
|
||||
[AC_MSG_ERROR([SYS_gettid and SYS_futex required for --enable-linux-futex])])
|
||||
;;
|
||||
esac
|
||||
;;
|
||||
esac
|
||||
|
||||
GCC_LINUX_FUTEX(:)
|
||||
|
||||
# Check for pthread_{,attr_}[sg]etaffinity_np.
|
||||
AC_LINK_IFELSE(
|
||||
[AC_LANG_PROGRAM(
|
||||
|
||||
@ -11,7 +11,7 @@
|
||||
# XLDFLAGS Add extra link flags to use.
|
||||
|
||||
# Optimize TLS usage by avoiding the overhead of dynamic allocation.
|
||||
if test $have_tls = yes ; then
|
||||
if test $gcc_cv_have_tls = yes ; then
|
||||
case "${target}" in
|
||||
|
||||
*-*-linux*)
|
||||
|
||||
@ -1,3 +1,23 @@
|
||||
2008-01-08 Jakub Jelinek <jakub@redhat.com>
|
||||
|
||||
* configure.ac (--enable-linux-futex): Add new configure option.
|
||||
(HAVE_LINUX_FUTEX): New AC_DEFINE.
|
||||
* Makefile.in: Rebuilt.
|
||||
* aclocal.m4: Rebuilt.
|
||||
* configure: Rebuilt.
|
||||
* config.h.in: Rebuilt.
|
||||
* config/cpu/generic/cxxabi_tweaks.h (_GLIBCXX_GUARD_BIT,
|
||||
_GLIBCXX_GUARD_PENDING_BIT, _GLIBCXX_GUARD_WAITING_BIT): Define.
|
||||
* config/cpu/arm/cxxabi_tweaks.h (_GLIBCXX_GUARD_BIT,
|
||||
_GLIBCXX_GUARD_PENDING_BIT, _GLIBCXX_GUARD_WAITING_BIT): Define.
|
||||
* libsupc++/guard.cc: Include climits and syscall.h.
|
||||
(_GLIBCXX_USE_FUTEX): Define if futex syscall and atomic builtins
|
||||
are supported.
|
||||
(_GLIBCXX_FUTEX_WAIT, _GLIBCXX_FUTEX_WAKE): Likewise.
|
||||
(__guard_test_bit): New static inline.
|
||||
(__cxa_guard_acquire, __cxa_guard_release, __cxa_guard_abort): Use
|
||||
atomic builtins and futex syscall if _GLIBCXX_USE_FUTEX.
|
||||
|
||||
2008-01-07 Paolo Carlini <pcarlini@suse.de>
|
||||
|
||||
PR libstdc++/34680
|
||||
|
||||
@ -54,6 +54,7 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/enable.m4 \
|
||||
$(top_srcdir)/../config/multi.m4 \
|
||||
$(top_srcdir)/../config/no-executables.m4 \
|
||||
$(top_srcdir)/../config/unwind_ipinfo.m4 \
|
||||
$(top_srcdir)/../config/futex.m4 \
|
||||
$(top_srcdir)/../libtool.m4 $(top_srcdir)/../ltoptions.m4 \
|
||||
$(top_srcdir)/../ltsugar.m4 $(top_srcdir)/../ltversion.m4 \
|
||||
$(top_srcdir)/crossconfig.m4 $(top_srcdir)/linkage.m4 \
|
||||
|
||||
1
libstdc++-v3/aclocal.m4
vendored
1
libstdc++-v3/aclocal.m4
vendored
@ -589,6 +589,7 @@ m4_include([../config/lib-prefix.m4])
|
||||
m4_include([../config/multi.m4])
|
||||
m4_include([../config/no-executables.m4])
|
||||
m4_include([../config/unwind_ipinfo.m4])
|
||||
m4_include([../config/futex.m4])
|
||||
m4_include([../libtool.m4])
|
||||
m4_include([../ltoptions.m4])
|
||||
m4_include([../ltsugar.m4])
|
||||
|
||||
@ -232,6 +232,9 @@
|
||||
/* Only used in build directory testsuite_hooks.h. */
|
||||
#undef HAVE_LIMIT_VMEM
|
||||
|
||||
/* Define if futex syscall is available. */
|
||||
#undef HAVE_LINUX_FUTEX
|
||||
|
||||
/* Define to 1 if you have the <locale.h> header file. */
|
||||
#undef HAVE_LOCALE_H
|
||||
|
||||
|
||||
@ -1,6 +1,6 @@
|
||||
// Control various target specific ABI tweaks. ARM version.
|
||||
|
||||
// Copyright (C) 2004, 2006 Free Software Foundation, Inc.
|
||||
// Copyright (C) 2004, 2006, 2008 Free Software Foundation, Inc.
|
||||
//
|
||||
// This file is part of the GNU ISO C++ Library. This library is free
|
||||
// software; you can redistribute it and/or modify it under the
|
||||
@ -46,6 +46,9 @@ namespace __cxxabiv1
|
||||
// guard variable. */
|
||||
#define _GLIBCXX_GUARD_TEST(x) ((*(x) & 1) != 0)
|
||||
#define _GLIBCXX_GUARD_SET(x) *(x) = 1
|
||||
#define _GLIBCXX_GUARD_BIT 1
|
||||
#define _GLIBCXX_GUARD_PENDING_BIT __guard_test_bit (1, 1)
|
||||
#define _GLIBCXX_GUARD_WAITING_BIT __guard_test_bit (2, 1)
|
||||
typedef int __guard;
|
||||
|
||||
// We also want the element size in array cookies.
|
||||
@ -62,6 +65,9 @@ namespace __cxxabiv1
|
||||
// The generic ABI uses the first byte of a 64-bit guard variable.
|
||||
#define _GLIBCXX_GUARD_TEST(x) (*(char *) (x) != 0)
|
||||
#define _GLIBCXX_GUARD_SET(x) *(char *) (x) = 1
|
||||
#define _GLIBCXX_GUARD_BIT __guard_test_bit (0, 1)
|
||||
#define _GLIBCXX_GUARD_PENDING_BIT __guard_test_bit (1, 1)
|
||||
#define _GLIBCXX_GUARD_WAITING_BIT __guard_test_bit (2, 1)
|
||||
__extension__ typedef int __guard __attribute__((mode (__DI__)));
|
||||
|
||||
// __cxa_vec_ctor has void return type.
|
||||
|
||||
@ -1,6 +1,6 @@
|
||||
// Control various target specific ABI tweaks. Generic version.
|
||||
|
||||
// Copyright (C) 2004, 2006 Free Software Foundation, Inc.
|
||||
// Copyright (C) 2004, 2006, 2008 Free Software Foundation, Inc.
|
||||
//
|
||||
// This file is part of the GNU ISO C++ Library. This library is free
|
||||
// software; you can redistribute it and/or modify it under the
|
||||
@ -44,6 +44,9 @@ namespace __cxxabiv1
|
||||
// The generic ABI uses the first byte of a 64-bit guard variable.
|
||||
#define _GLIBCXX_GUARD_TEST(x) (*(char *) (x) != 0)
|
||||
#define _GLIBCXX_GUARD_SET(x) *(char *) (x) = 1
|
||||
#define _GLIBCXX_GUARD_BIT __guard_test_bit (0, 1)
|
||||
#define _GLIBCXX_GUARD_PENDING_BIT __guard_test_bit (1, 1)
|
||||
#define _GLIBCXX_GUARD_WAITING_BIT __guard_test_bit (2, 1)
|
||||
__extension__ typedef int __guard __attribute__((mode (__DI__)));
|
||||
|
||||
// __cxa_vec_ctor has void return type.
|
||||
|
||||
216
libstdc++-v3/configure
vendored
216
libstdc++-v3/configure
vendored
@ -1053,6 +1053,8 @@ Optional Features:
|
||||
memory [default=no]
|
||||
--enable-tls Use thread-local storage [default=yes]
|
||||
--disable-rpath do not hardcode runtime library paths
|
||||
--enable-linux-futex use the Linux futex system call
|
||||
[default=default]
|
||||
--enable-symvers=STYLE enables symbol versioning of the shared library
|
||||
[default=yes]
|
||||
--enable-visibility enables visibility safe usage [default=yes]
|
||||
@ -114116,8 +114118,222 @@ _ACEOF
|
||||
#define HAVE_GETIPINFO 1
|
||||
_ACEOF
|
||||
|
||||
fi
|
||||
|
||||
# Check whether --enable-linux-futex or --disable-linux-futex was given.
|
||||
if test "${enable_linux_futex+set}" = set; then
|
||||
enableval="$enable_linux_futex"
|
||||
|
||||
case "$enableval" in
|
||||
yes|no|default) ;;
|
||||
*) { { echo "$as_me:$LINENO: error: Unknown argument to enable/disable linux-futex" >&5
|
||||
echo "$as_me: error: Unknown argument to enable/disable linux-futex" >&2;}
|
||||
{ (exit 1); exit 1; }; } ;;
|
||||
esac
|
||||
|
||||
else
|
||||
enable_linux_futex=default
|
||||
fi;
|
||||
|
||||
case "$target" in
|
||||
*-linux*)
|
||||
case "$enable_linux_futex" in
|
||||
default)
|
||||
# If headers don't have gettid/futex syscalls definition, then
|
||||
# default to no, otherwise there will be compile time failures.
|
||||
# Otherwise, default to yes. If we don't detect we are
|
||||
# compiled/linked against NPTL and not cross-compiling, check
|
||||
# if programs are run by default against NPTL and if not, issue
|
||||
# a warning.
|
||||
enable_linux_futex=no
|
||||
if test x$gcc_no_link = xyes; then
|
||||
{ { echo "$as_me:$LINENO: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&5
|
||||
echo "$as_me: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&2;}
|
||||
{ (exit 1); exit 1; }; }
|
||||
fi
|
||||
cat >conftest.$ac_ext <<_ACEOF
|
||||
/* confdefs.h. */
|
||||
_ACEOF
|
||||
cat confdefs.h >>conftest.$ac_ext
|
||||
cat >>conftest.$ac_ext <<_ACEOF
|
||||
/* end confdefs.h. */
|
||||
#include <sys/syscall.h>
|
||||
int lk;
|
||||
int
|
||||
main ()
|
||||
{
|
||||
syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);
|
||||
;
|
||||
return 0;
|
||||
}
|
||||
_ACEOF
|
||||
rm -f conftest.$ac_objext conftest$ac_exeext
|
||||
if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
|
||||
(eval $ac_link) 2>conftest.er1
|
||||
ac_status=$?
|
||||
grep -v '^ *+' conftest.er1 >conftest.err
|
||||
rm -f conftest.er1
|
||||
cat conftest.err >&5
|
||||
echo "$as_me:$LINENO: \$? = $ac_status" >&5
|
||||
(exit $ac_status); } &&
|
||||
{ ac_try='test -z "$ac_c_werror_flag"
|
||||
|| test ! -s conftest.err'
|
||||
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
|
||||
(eval $ac_try) 2>&5
|
||||
ac_status=$?
|
||||
echo "$as_me:$LINENO: \$? = $ac_status" >&5
|
||||
(exit $ac_status); }; } &&
|
||||
{ ac_try='test -s conftest$ac_exeext'
|
||||
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
|
||||
(eval $ac_try) 2>&5
|
||||
ac_status=$?
|
||||
echo "$as_me:$LINENO: \$? = $ac_status" >&5
|
||||
(exit $ac_status); }; }; then
|
||||
save_LIBS="$LIBS"
|
||||
LIBS="-lpthread $LIBS"
|
||||
if test x$gcc_no_link = xyes; then
|
||||
{ { echo "$as_me:$LINENO: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&5
|
||||
echo "$as_me: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&2;}
|
||||
{ (exit 1); exit 1; }; }
|
||||
fi
|
||||
cat >conftest.$ac_ext <<_ACEOF
|
||||
/* confdefs.h. */
|
||||
_ACEOF
|
||||
cat confdefs.h >>conftest.$ac_ext
|
||||
cat >>conftest.$ac_ext <<_ACEOF
|
||||
/* end confdefs.h. */
|
||||
#ifndef _GNU_SOURCE
|
||||
#define _GNU_SOURCE 1
|
||||
#endif
|
||||
#include <pthread.h>
|
||||
pthread_t th; void *status;
|
||||
int
|
||||
main ()
|
||||
{
|
||||
pthread_tryjoin_np (th, &status);
|
||||
;
|
||||
return 0;
|
||||
}
|
||||
_ACEOF
|
||||
rm -f conftest.$ac_objext conftest$ac_exeext
|
||||
if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
|
||||
(eval $ac_link) 2>conftest.er1
|
||||
ac_status=$?
|
||||
grep -v '^ *+' conftest.er1 >conftest.err
|
||||
rm -f conftest.er1
|
||||
cat conftest.err >&5
|
||||
echo "$as_me:$LINENO: \$? = $ac_status" >&5
|
||||
(exit $ac_status); } &&
|
||||
{ ac_try='test -z "$ac_c_werror_flag"
|
||||
|| test ! -s conftest.err'
|
||||
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
|
||||
(eval $ac_try) 2>&5
|
||||
ac_status=$?
|
||||
echo "$as_me:$LINENO: \$? = $ac_status" >&5
|
||||
(exit $ac_status); }; } &&
|
||||
{ ac_try='test -s conftest$ac_exeext'
|
||||
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
|
||||
(eval $ac_try) 2>&5
|
||||
ac_status=$?
|
||||
echo "$as_me:$LINENO: \$? = $ac_status" >&5
|
||||
(exit $ac_status); }; }; then
|
||||
enable_linux_futex=yes
|
||||
else
|
||||
echo "$as_me: failed program was:" >&5
|
||||
sed 's/^/| /' conftest.$ac_ext >&5
|
||||
|
||||
if test x$cross_compiling = xno; then
|
||||
if getconf GNU_LIBPTHREAD_VERSION 2>/dev/null \
|
||||
| LC_ALL=C grep -i NPTL > /dev/null 2>/dev/null; then :; else
|
||||
{ echo "$as_me:$LINENO: WARNING: The kernel might not support futex or gettid syscalls.
|
||||
If so, please configure with --disable-linux-futex" >&5
|
||||
echo "$as_me: WARNING: The kernel might not support futex or gettid syscalls.
|
||||
If so, please configure with --disable-linux-futex" >&2;}
|
||||
fi
|
||||
fi
|
||||
enable_linux_futex=yes
|
||||
fi
|
||||
rm -f conftest.err conftest.$ac_objext \
|
||||
conftest$ac_exeext conftest.$ac_ext
|
||||
LIBS="$save_LIBS"
|
||||
else
|
||||
echo "$as_me: failed program was:" >&5
|
||||
sed 's/^/| /' conftest.$ac_ext >&5
|
||||
|
||||
fi
|
||||
rm -f conftest.err conftest.$ac_objext \
|
||||
conftest$ac_exeext conftest.$ac_ext
|
||||
;;
|
||||
yes)
|
||||
if test x$gcc_no_link = xyes; then
|
||||
{ { echo "$as_me:$LINENO: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&5
|
||||
echo "$as_me: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&2;}
|
||||
{ (exit 1); exit 1; }; }
|
||||
fi
|
||||
cat >conftest.$ac_ext <<_ACEOF
|
||||
/* confdefs.h. */
|
||||
_ACEOF
|
||||
cat confdefs.h >>conftest.$ac_ext
|
||||
cat >>conftest.$ac_ext <<_ACEOF
|
||||
/* end confdefs.h. */
|
||||
#include <sys/syscall.h>
|
||||
int lk;
|
||||
int
|
||||
main ()
|
||||
{
|
||||
syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);
|
||||
;
|
||||
return 0;
|
||||
}
|
||||
_ACEOF
|
||||
rm -f conftest.$ac_objext conftest$ac_exeext
|
||||
if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
|
||||
(eval $ac_link) 2>conftest.er1
|
||||
ac_status=$?
|
||||
grep -v '^ *+' conftest.er1 >conftest.err
|
||||
rm -f conftest.er1
|
||||
cat conftest.err >&5
|
||||
echo "$as_me:$LINENO: \$? = $ac_status" >&5
|
||||
(exit $ac_status); } &&
|
||||
{ ac_try='test -z "$ac_c_werror_flag"
|
||||
|| test ! -s conftest.err'
|
||||
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
|
||||
(eval $ac_try) 2>&5
|
||||
ac_status=$?
|
||||
echo "$as_me:$LINENO: \$? = $ac_status" >&5
|
||||
(exit $ac_status); }; } &&
|
||||
{ ac_try='test -s conftest$ac_exeext'
|
||||
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
|
||||
(eval $ac_try) 2>&5
|
||||
ac_status=$?
|
||||
echo "$as_me:$LINENO: \$? = $ac_status" >&5
|
||||
(exit $ac_status); }; }; then
|
||||
:
|
||||
else
|
||||
echo "$as_me: failed program was:" >&5
|
||||
sed 's/^/| /' conftest.$ac_ext >&5
|
||||
|
||||
{ { echo "$as_me:$LINENO: error: SYS_gettid and SYS_futex required for --enable-linux-futex" >&5
|
||||
echo "$as_me: error: SYS_gettid and SYS_futex required for --enable-linux-futex" >&2;}
|
||||
{ (exit 1); exit 1; }; }
|
||||
fi
|
||||
rm -f conftest.err conftest.$ac_objext \
|
||||
conftest$ac_exeext conftest.$ac_ext
|
||||
;;
|
||||
esac
|
||||
;;
|
||||
*)
|
||||
enable_linux_futex=no
|
||||
;;
|
||||
esac
|
||||
if test x$enable_linux_futex = xyes; then
|
||||
|
||||
cat >>confdefs.h <<\_ACEOF
|
||||
#define HAVE_LINUX_FUTEX 1
|
||||
_ACEOF
|
||||
|
||||
fi
|
||||
|
||||
|
||||
# This depends on GLIBCXX CHECK_LINKER_FEATURES, but without it assumes no.
|
||||
|
||||
|
||||
@ -295,9 +295,10 @@ else
|
||||
|
||||
# Assume we have _Unwind_GetIPInfo for cross-compiles.
|
||||
AC_DEFINE(HAVE_GETIPINFO)
|
||||
|
||||
fi
|
||||
|
||||
GCC_LINUX_FUTEX([AC_DEFINE(HAVE_LINUX_FUTEX, 1, [Define if futex syscall is available.])])
|
||||
|
||||
# This depends on GLIBCXX CHECK_LINKER_FEATURES, but without it assumes no.
|
||||
GLIBCXX_ENABLE_SYMVERS([yes])
|
||||
GLIBCXX_ENABLE_VISIBILITY([yes])
|
||||
|
||||
@ -35,12 +35,21 @@
|
||||
#include <new>
|
||||
#include <ext/atomicity.h>
|
||||
#include <ext/concurrence.h>
|
||||
#if defined(__GTHREADS) && defined(__GTHREAD_HAS_COND) \
|
||||
&& defined(_GLIBCXX_ATOMIC_BUILTINS) && defined(_GLIBCXX_HAVE_LINUX_FUTEX)
|
||||
# include <climits>
|
||||
# include <syscall.h>
|
||||
# define _GLIBCXX_USE_FUTEX
|
||||
# define _GLIBCXX_FUTEX_WAIT 0
|
||||
# define _GLIBCXX_FUTEX_WAKE 1
|
||||
#endif
|
||||
|
||||
// The IA64/generic ABI uses the first byte of the guard variable.
|
||||
// The ARM EABI uses the least significant bit.
|
||||
|
||||
// Thread-safe static local initialization support.
|
||||
#ifdef __GTHREADS
|
||||
# ifndef _GLIBCXX_USE_FUTEX
|
||||
namespace
|
||||
{
|
||||
// A single mutex controlling all static initializations.
|
||||
@ -75,8 +84,9 @@ namespace
|
||||
}
|
||||
};
|
||||
}
|
||||
# endif
|
||||
|
||||
#ifdef __GTHREAD_HAS_COND
|
||||
# if defined(__GTHREAD_HAS_COND) && !defined(_GLIBCXX_USE_FUTEX)
|
||||
namespace
|
||||
{
|
||||
// A single conditional variable controlling all static initializations.
|
||||
@ -98,9 +108,9 @@ namespace
|
||||
return *static_cond;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
# endif
|
||||
|
||||
#ifndef _GLIBCXX_GUARD_TEST_AND_ACQUIRE
|
||||
# ifndef _GLIBCXX_GUARD_TEST_AND_ACQUIRE
|
||||
inline bool
|
||||
__test_and_acquire (__cxxabiv1::__guard *g)
|
||||
{
|
||||
@ -108,24 +118,24 @@ __test_and_acquire (__cxxabiv1::__guard *g)
|
||||
_GLIBCXX_READ_MEM_BARRIER;
|
||||
return b;
|
||||
}
|
||||
#define _GLIBCXX_GUARD_TEST_AND_ACQUIRE(G) __test_and_acquire (G)
|
||||
#endif
|
||||
# define _GLIBCXX_GUARD_TEST_AND_ACQUIRE(G) __test_and_acquire (G)
|
||||
# endif
|
||||
|
||||
#ifndef _GLIBCXX_GUARD_SET_AND_RELEASE
|
||||
# ifndef _GLIBCXX_GUARD_SET_AND_RELEASE
|
||||
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
|
||||
# define _GLIBCXX_GUARD_SET_AND_RELEASE(G) __set_and_release (G)
|
||||
# endif
|
||||
|
||||
#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)
|
||||
# undef _GLIBCXX_GUARD_TEST_AND_ACQUIRE
|
||||
# undef _GLIBCXX_GUARD_SET_AND_RELEASE
|
||||
# define _GLIBCXX_GUARD_SET_AND_RELEASE(G) _GLIBCXX_GUARD_SET (G)
|
||||
|
||||
#endif /* __GTHREADS */
|
||||
|
||||
@ -176,8 +186,35 @@ namespace __gnu_cxx
|
||||
// headers define a symbol __GTHREAD_HAS_COND for platforms that support POSIX
|
||||
// like conditional variables. For platforms that do not support conditional
|
||||
// variables, we need to fall back to the old code.
|
||||
|
||||
// If _GLIBCXX_USE_FUTEX, no global mutex or conditional 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
|
||||
|
||||
static inline int
|
||||
init_in_progress_flag(__guard* g)
|
||||
{ return ((char *)g)[1]; }
|
||||
@ -207,7 +244,7 @@ namespace __cxxabiv1
|
||||
return 0;
|
||||
|
||||
if (init_in_progress_flag(g))
|
||||
throw_recursive_init_exception();
|
||||
throw_recursive_init_exception();
|
||||
|
||||
set_init_in_progress_flag(g, 1);
|
||||
return 1;
|
||||
@ -223,14 +260,46 @@ namespace __cxxabiv1
|
||||
if (_GLIBCXX_GUARD_TEST_AND_ACQUIRE (g))
|
||||
return 0;
|
||||
|
||||
# ifdef _GLIBCXX_USE_FUTEX
|
||||
// If __sync_* 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 old = __sync_val_compare_and_swap (gi, 0, pending_bit);
|
||||
if (old == 0)
|
||||
return 1; // This thread should do the initialization.
|
||||
|
||||
if (old == guard_bit)
|
||||
return 0; // Already initialized.
|
||||
|
||||
if (old == pending_bit)
|
||||
{
|
||||
int newv = old | waiting_bit;
|
||||
if (__sync_val_compare_and_swap (gi, old, newv) != old)
|
||||
continue;
|
||||
|
||||
old = newv;
|
||||
}
|
||||
|
||||
syscall (SYS_futex, gi, _GLIBCXX_FUTEX_WAIT, old, 0);
|
||||
}
|
||||
}
|
||||
# else
|
||||
if (__gthread_active_p ())
|
||||
{
|
||||
mutex_wrapper mw;
|
||||
|
||||
while (1) // When this loop is executing, mutex is locked.
|
||||
{
|
||||
#ifdef __GTHREAD_HAS_COND
|
||||
// The static is allready initialized.
|
||||
# ifdef __GTHREAD_HAS_COND
|
||||
// The static is already initialized.
|
||||
if (_GLIBCXX_GUARD_TEST(g))
|
||||
return 0; // The mutex will be unlocked via wrapper
|
||||
|
||||
@ -247,7 +316,7 @@ namespace __cxxabiv1
|
||||
set_init_in_progress_flag(g, 1);
|
||||
return 1; // The mutex will be unlocked via wrapper.
|
||||
}
|
||||
#else
|
||||
# else
|
||||
// This provides compatibility with older systems not supporting
|
||||
// POSIX like conditional variables.
|
||||
if (acquire(g))
|
||||
@ -256,9 +325,10 @@ namespace __cxxabiv1
|
||||
return 1; // The mutex still locked.
|
||||
}
|
||||
return 0; // The mutex will be unlocked via wrapper.
|
||||
#endif
|
||||
# endif
|
||||
}
|
||||
}
|
||||
# endif
|
||||
#endif
|
||||
|
||||
return acquire (g);
|
||||
@ -267,7 +337,20 @@ namespace __cxxabiv1
|
||||
extern "C"
|
||||
void __cxa_guard_abort (__guard *g)
|
||||
{
|
||||
#ifdef __GTHREAD_HAS_COND
|
||||
#ifdef _GLIBCXX_USE_FUTEX
|
||||
// If __sync_* 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 = __sync_lock_test_and_set (gi, 0);
|
||||
|
||||
if ((old & waiting_bit) != 0)
|
||||
syscall (SYS_futex, gi, _GLIBCXX_FUTEX_WAKE, INT_MAX);
|
||||
return;
|
||||
}
|
||||
#elif defined(__GTHREAD_HAS_COND)
|
||||
if (__gthread_active_p())
|
||||
{
|
||||
mutex_wrapper mw;
|
||||
@ -293,7 +376,21 @@ namespace __cxxabiv1
|
||||
extern "C"
|
||||
void __cxa_guard_release (__guard *g)
|
||||
{
|
||||
#ifdef __GTHREAD_HAS_COND
|
||||
#ifdef _GLIBCXX_USE_FUTEX
|
||||
// If __sync_* 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 = __sync_lock_test_and_set (gi, guard_bit);
|
||||
|
||||
if ((old & waiting_bit) != 0)
|
||||
syscall (SYS_futex, gi, _GLIBCXX_FUTEX_WAKE, INT_MAX);
|
||||
return;
|
||||
}
|
||||
#elif defined(__GTHREAD_HAS_COND)
|
||||
if (__gthread_active_p())
|
||||
{
|
||||
mutex_wrapper mw;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user