| // <atomic> compatibility -*- C++ -*- |
| |
| // Copyright (C) 2008-2017 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> |
| |
| // XXX GLIBCXX_ABI Deprecated |
| // gcc-4.7.0 |
| |
| #ifdef _GLIBCXX_SHARED |
| |
| #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 _GLIBCXX_VISIBILITY(default) |
| { |
| _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| |
| namespace __atomic0 |
| { |
| |
| struct atomic_flag : public __atomic_flag_base |
| { |
| bool |
| test_and_set(memory_order) noexcept; |
| |
| void |
| clear(memory_order) noexcept; |
| }; |
| |
| bool |
| atomic_flag::test_and_set(memory_order) noexcept |
| { |
| #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) noexcept |
| { |
| #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) |
| lock_guard<mutex> __lock(get_atomic_mutex()); |
| #endif |
| _M_i = false; |
| } |
| } // namespace __atomic0 |
| |
| _GLIBCXX_BEGIN_EXTERN_C |
| |
| bool |
| atomic_flag_test_and_set_explicit(__atomic_flag_base* __a, |
| memory_order __m) _GLIBCXX_NOTHROW |
| { |
| atomic_flag* d = static_cast<atomic_flag*>(__a); |
| return d->test_and_set(__m); |
| } |
| |
| void |
| atomic_flag_clear_explicit(__atomic_flag_base* __a, |
| memory_order __m) _GLIBCXX_NOTHROW |
| { |
| atomic_flag* d = static_cast<atomic_flag*>(__a); |
| return d->clear(__m); |
| } |
| |
| void |
| __atomic_flag_wait_explicit(__atomic_flag_base* __a, |
| memory_order __x) _GLIBCXX_NOTHROW |
| { |
| while (atomic_flag_test_and_set_explicit(__a, __x)) |
| { }; |
| } |
| |
| _GLIBCXX_CONST __atomic_flag_base* |
| __atomic_flag_for_address(const volatile void* __z) _GLIBCXX_NOTHROW |
| { |
| 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; |
| } |
| |
| _GLIBCXX_END_EXTERN_C |
| |
| _GLIBCXX_END_NAMESPACE_VERSION |
| } // namespace std |
| |
| #endif |
| |
| // 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(_GLIBCXX_SHARED) \ |
| && defined(_GLIBCXX_HAVE_AS_SYMVER_DIRECTIVE) \ |
| && defined(_GLIBCXX_HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT) |
| |
| #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 |