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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libstdc++-v3/config/cpu/i386 | |
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Diffstat (limited to 'libstdc++-v3/config/cpu/i386')
-rw-r--r-- | libstdc++-v3/config/cpu/i386/atomicity.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/libstdc++-v3/config/cpu/i386/atomicity.h b/libstdc++-v3/config/cpu/i386/atomicity.h new file mode 100644 index 000000000..97205e42f --- /dev/null +++ b/libstdc++-v3/config/cpu/i386/atomicity.h @@ -0,0 +1,73 @@ +// Low-level functions for atomic operations: x86, x >= 3 version -*- C++ -*- + +// Copyright (C) 2003, 2004, 2005, 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 <ext/atomicity.h> + +namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) +{ +_GLIBCXX_BEGIN_NAMESPACE_VERSION + + template<int __inst> + struct _Atomicity_lock + { + static volatile _Atomic_word _S_atomicity_lock; + }; + + template<int __inst> + volatile _Atomic_word _Atomicity_lock<__inst>::_S_atomicity_lock = 0; + + template volatile _Atomic_word _Atomicity_lock<0>::_S_atomicity_lock; + + _Atomic_word + __attribute__ ((__unused__)) + __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw () + { + register _Atomic_word __result, __tmp = 1; + + // Obtain the atomic exchange/add spin lock. + do + { + __asm__ __volatile__ ("xchg{l} {%0,%1|%1,%0}" + : "=m" (_Atomicity_lock<0>::_S_atomicity_lock), + "+r" (__tmp) + : "m" (_Atomicity_lock<0>::_S_atomicity_lock)); + } + while (__tmp); + + __result = *__mem; + *__mem += __val; + + // Release spin lock. + _Atomicity_lock<0>::_S_atomicity_lock = 0; + + return __result; + } + + void + __attribute__ ((__unused__)) + __atomic_add(volatile _Atomic_word* __mem, int __val) throw () + { __exchange_and_add(__mem, __val); } + +_GLIBCXX_END_NAMESPACE_VERSION +} // namespace |