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re PR libstdc++/12658 (Thread safety problems in locale::global() and locale::locale())

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2003-12-15  Benjamin Kosnik  <bkoz@redhat.com>

	PR libstdc++/12658
	* include/Makefile.am (bits_headers): Add concurrence.h.
	* include/Makefile.in: Regenerated.
	* include/bits/concurrence.h: New.
	* src/locale_init.cc: Use it.
	(locale::locale): Lock critical regions.
	(locale::global): Same.

From-SVN: r74648
This commit is contained in:
Benjamin Kosnik 2003-12-15 21:08:03 +00:00 committed by Benjamin Kosnik
parent 86d75cddd2
commit 3fe1373814
5 changed files with 77 additions and 5 deletions
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10
libstdc++-v3/ChangeLog
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@ -1,3 +1,13 @@
2003-12-15 Benjamin Kosnik <bkoz@redhat.com>
PR libstdc++/12658
* include/Makefile.am (bits_headers): Add concurrence.h.
* include/Makefile.in: Regenerated.
* include/bits/concurrence.h: New.
* src/locale_init.cc: Use it.
(locale::locale): Lock critical regions.
(locale::global): Same.
2003-12-15 Benjamin Kosnik <bkoz@redhat.com>
* include/bits/basic_string.h: Change _*_references to _*_refcount.

1
libstdc++-v3/include/Makefile.am
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@ -101,6 +101,7 @@ bits_headers = \
${bits_srcdir}/char_traits.h \
${bits_srcdir}/codecvt.h \
${bits_srcdir}/concept_check.h \
${bits_srcdir}/concurrence.h \
${bits_srcdir}/cpp_type_traits.h \
${bits_srcdir}/demangle.h \
${bits_srcdir}/deque.tcc \

5
libstdc++-v3/include/Makefile.in
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@ -296,6 +296,7 @@ bits_headers = \
${bits_srcdir}/char_traits.h \
${bits_srcdir}/codecvt.h \
${bits_srcdir}/concept_check.h \
${bits_srcdir}/concurrence.h \
${bits_srcdir}/cpp_type_traits.h \
${bits_srcdir}/demangle.h \
${bits_srcdir}/deque.tcc \
@ -518,15 +519,15 @@ debug_headers = \
${debug_srcdir}/string \
${debug_srcdir}/vector
@GLIBCXX_C_HEADERS_C_STD_FALSE@c_base_headers_extra =
# Some of the different "C" header models need extra files.
# Some "C" header schemes require the "C" compatibility headers.
# For --enable-cheaders=c_std
@GLIBCXX_C_HEADERS_C_STD_TRUE@c_base_headers_extra = ${c_base_srcdir}/cmath.tcc
@GLIBCXX_C_HEADERS_C_STD_FALSE@c_base_headers_extra =
@GLIBCXX_C_HEADERS_COMPATIBILITY_FALSE@c_compatibility_headers_extra =
@GLIBCXX_C_HEADERS_COMPATIBILITY_TRUE@c_compatibility_headers_extra = ${c_compatibility_headers}
@GLIBCXX_C_HEADERS_COMPATIBILITY_FALSE@c_compatibility_headers_extra =
host_srcdir = ${glibcxx_srcdir}/$(OS_INC_SRCDIR)
host_builddir = ./${host_alias}/bits

54
libstdc++-v3/include/bits/concurrence.h Normal file
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@ -0,0 +1,54 @@
// Support for concurrent programing -*- C++ -*-
// Copyright (C) 2003
// 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
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library 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.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
#ifndef _CONCURRENCE
#define _CONCURRENCE 1
// GCC's thread abstraction layer
#include "bits/gthr.h"
#if __GTHREADS
# ifdef __GTHREAD_MUTEX_INIT
# define __glibcxx_mutex_define_initialized(NAME) \
__gthread_mutex_t NAME = __GTHREAD_MUTEX_INIT
# else
# define __glibcxx_mutex_define_initialized(NAME) \
__gthread_mutex_t NAME; \
__GTHREAD_MUTEX_INIT_FUNCTION(&NAME)
# endif
# define __glibcxx_mutex_lock(LOCK) __gthread_mutex_lock(&LOCK)
# define __glibcxx_mutex_unlock(LOCK) __gthread_mutex_unlock(&LOCK)
#else
# define __glibcxx_mutex_define_initialized(NAME)
# define __glibcxx_mutex_lock(LOCK)
# define __glibcxx_mutex_unlock(LOCK)
#endif
#endif

12
libstdc++-v3/src/locale_init.cc
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@ -33,6 +33,7 @@
#include <cwctype> // For towupper, etc.
#include <locale>
#include <bits/atomicity.h>
#include <bits/concurrence.h>
namespace __gnu_cxx
{
@ -96,21 +97,26 @@ namespace std
locale::locale() throw()
{
_S_initialize();
(_M_impl = _S_global)->_M_add_reference();
__glibcxx_mutex_define_initialized(lock);
__glibcxx_mutex_lock(lock);
_S_global->_M_add_reference();
_M_impl = _S_global;
__glibcxx_mutex_unlock(lock);
}
locale
locale::global(const locale& __other)
{
_S_initialize();
// XXX MT
__glibcxx_mutex_define_initialized(lock);
__glibcxx_mutex_lock(lock);
_Impl* __old = _S_global;
__other._M_impl->_M_add_reference();
_S_global = __other._M_impl;
if (_S_global->_M_check_same_name()
&& (std::strcmp(_S_global->_M_names[0], "*") != 0))
setlocale(LC_ALL, __other.name().c_str());
__glibcxx_mutex_unlock(lock);
// Reference count sanity check: one reference removed for the
// subsition of __other locale, one added by return-by-value. Net