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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc4/] [libstdc++-v3/] [src/] [atomic.cc] - Rev 796
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// Support for atomic operations -*- C++ -*- // Copyright (C) 2008, 2009 // 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 3, 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. // 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/>. #include "gstdint.h" #include <atomic> #include <mutex> #define LOGSIZE 4 namespace { #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) std::mutex& get_atomic_mutex() { static std::mutex atomic_mutex; return atomic_mutex; } #endif std::__atomic_flag_base flag_table[ 1 << LOGSIZE ] = { ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, }; } // anonymous namespace namespace std { namespace __atomic0 { bool atomic_flag::test_and_set(memory_order) { #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) lock_guard<mutex> __lock(get_atomic_mutex()); #endif bool result = _M_i; _M_i = true; return result; } void atomic_flag::clear(memory_order) { #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) lock_guard<mutex> __lock(get_atomic_mutex()); #endif _M_i = false; } } extern "C" { bool atomic_flag_test_and_set_explicit(__atomic_flag_base* __a, memory_order __m) throw() { atomic_flag* d = static_cast<volatile atomic_flag*>(__a); return d->test_and_set(__m); } void atomic_flag_clear_explicit(__atomic_flag_base* __a, memory_order __m) throw() { atomic_flag* d = static_cast<volatile atomic_flag*>(__a); return d->clear(__m); } void __atomic_flag_wait_explicit(__atomic_flag_base* __a, memory_order __x) throw() { while (atomic_flag_test_and_set_explicit(__a, __x)) { }; } __atomic_flag_base* __atomic_flag_for_address(const void* __z) throw() { uintptr_t __u = reinterpret_cast<uintptr_t>(__z); __u += (__u >> 2) + (__u << 4); __u += (__u >> 7) + (__u << 5); __u += (__u >> 17) + (__u << 13); if (sizeof(uintptr_t) > 4) __u += (__u >> 31); __u &= ~((~uintptr_t(0)) << LOGSIZE); return flag_table + __u; } } // extern "C" } // namespace std // XXX GLIBCXX_ABI Deprecated // gcc-4.5.0 // <atomic> signature changes // The rename syntax for default exported names is // asm (".symver name1,exportedname@GLIBCXX_3.4") // asm (".symver name2,exportedname@@GLIBCXX_3.4.5") // In the future, GLIBCXX_ABI > 6 should remove all uses of // _GLIBCXX_*_SYMVER macros in this file. #if defined(_GLIBCXX_SYMVER_GNU) && defined(PIC) \ && defined(_GLIBCXX_HAVE_AS_SYMVER_DIRECTIVE) #define _GLIBCXX_ASM_SYMVER(cur, old, version) \ asm (".symver " #cur "," #old "@@" #version); _GLIBCXX_ASM_SYMVER(_ZNSt9__atomic011atomic_flag5clearESt12memory_order, _ZNVSt9__atomic011atomic_flag5clearESt12memory_order, GLIBCXX_3.4.11) _GLIBCXX_ASM_SYMVER(_ZNSt9__atomic011atomic_flag12test_and_setESt12memory_order, _ZNVSt9__atomic011atomic_flag12test_and_setESt12memory_order, GLIBCXX_3.4.11) #endif
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