Mercurial > hg > CbC > CbC_gcc
view libstdc++-v3/libsupc++/eh_atomics.h @ 158:494b0b89df80 default tip
...
author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
---|---|
date | Mon, 25 May 2020 18:13:55 +0900 |
parents | 1830386684a0 |
children |
line wrap: on
line source
// Exception Handling support header for -*- C++ -*- // Copyright (C) 2016-2020 Free Software Foundation, Inc. // // This file is part of GCC. // // GCC 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. // // GCC 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/>. /** @file eh_atomics.h * This is an internal header file, included by library source files. * Do not attempt to use it directly. */ #ifndef _EH_ATOMICS_H #define _EH_ATOMICS_H 1 #include <bits/c++config.h> #include <bits/atomic_word.h> #include <bits/atomic_lockfree_defines.h> #if ATOMIC_INT_LOCK_FREE <= 1 # include <ext/atomicity.h> #endif #pragma GCC visibility push(default) extern "C++" { namespace __gnu_cxx { void __eh_atomic_inc (_Atomic_word* __count) __attribute__((always_inline)); bool __eh_atomic_dec (_Atomic_word* __count) __attribute__((always_inline)); // Increments the count. inline void __eh_atomic_inc (_Atomic_word* __count) { #if ATOMIC_INT_LOCK_FREE > 1 __atomic_add_fetch (__count, 1, __ATOMIC_ACQ_REL); #else _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE (__count); __gnu_cxx::__atomic_add_dispatch (__count, 1); _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER (__count); #endif } // Decrements the count and returns true if it reached zero. inline bool __eh_atomic_dec (_Atomic_word* __count) { #if ATOMIC_INT_LOCK_FREE > 1 return __atomic_sub_fetch (__count, 1, __ATOMIC_ACQ_REL) == 0; #else _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE (__count); if (__gnu_cxx::__exchange_and_add_dispatch (__count, -1) == 1) { _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER (__count); return true; } return false; #endif } } // namespace __gnu_cxx } #pragma GCC visibility pop #endif // _EH_ATOMICS_H