a29456b524
2001-02-27 Benjamin Kosnik <bkoz@redhat.com> Correct license. * config/cpu/alpha/bits/atomicity.h: Change. * config/cpu/arm/bits/atomicity.h * config/cpu/generic/bits/atomicity.h * config/cpu/i386/bits/atomicity.h * config/cpu/i486/bits/atomicity.h * config/cpu/ia64/bits/atomicity.h * config/cpu/powerpc/bits/atomicity.h * config/cpu/sparc/sparc32/bits/atomicity.h * config/cpu/sparc/sparc64/bits/atomicity.h * config/os/aix/bits/atomicity.h * config/os/irix/bits/atomicity.h From-SVN: r40103
71 lines
2.4 KiB
C++
71 lines
2.4 KiB
C++
// Low-level functions for atomic operations: x86, x >= 4 version -*- C++ -*-
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// Copyright (C) 1999, 2000, 2001 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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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;
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__asm__ __volatile__ ("lock; xaddl %0,%2"
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: "=r" (__result)
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: "0" (__val), "m" (*__mem)
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: "memory");
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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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__asm__ __volatile__ ("lock; addl %0,%1"
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: : "ir" (__val), "m" (*__mem) : "memory");
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}
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static inline char
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__attribute__ ((__unused__))
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__compare_and_swap (volatile long* __p, long __oldval, long __newval)
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{
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char __ret;
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long __readval;
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__asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0"
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: "=q" (__ret), "=m" (*__p), "=a" (__readval)
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: "r" (__newval), "m" (*__p), "a" (__oldval));
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return __ret;
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}
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#endif /* atomicity.h */
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