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2003-06-02 Andrew Pinski <pinskia@physics.uc.edu> PR libstdc++/9815 * config/cpu/i386/atomicity.h (__exchange_and_add): add intel asm case to asm. * config/cpu/i486/atomicity.h (__exchange_and_add): Likewise. (__atomic_add): likewise. From-SVN: r67343
76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
// Low-level functions for atomic operations: x86, x >= 3 version -*- C++ -*-
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// Copyright (C) 2003 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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#ifndef _BITS_ATOMICITY_H
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#define _BITS_ATOMICITY_H 1
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typedef int _Atomic_word;
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template <int __inst>
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struct __Atomicity_lock
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{
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static volatile _Atomic_word _S_atomicity_lock;
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};
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template <int __inst>
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volatile _Atomic_word __Atomicity_lock<__inst>::_S_atomicity_lock = 0;
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template volatile _Atomic_word __Atomicity_lock<0>::_S_atomicity_lock;
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static inline _Atomic_word
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__attribute__ ((__unused__))
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__exchange_and_add (volatile _Atomic_word *__mem, int __val)
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{
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register _Atomic_word __result, __tmp = 1;
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/* obtain the atomic exchange/add spin lock */
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do {
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__asm__ __volatile__ ("xchg{l} {%0,%1|%1,%0}"
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: "+m" (__Atomicity_lock<0>::_S_atomicity_lock),
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"+r" (__tmp));
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} while (__tmp);
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__result = *__mem;
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*__mem += __val;
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/* release spin lock */
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__Atomicity_lock<0>::_S_atomicity_lock = 0;
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return __result;
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}
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static inline void
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__attribute__ ((__unused__))
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__atomic_add (volatile _Atomic_word* __mem, int __val)
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{
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__exchange_and_add (__mem, __val);
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}
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#endif /* atomicity.h */
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