7069c22117
2002-11-07 Phil Edwards <pme@gcc.gnu.org>
Richard Earnshaw <rearnsha@arm.com>
* config/cpu/generic/atomicity.h: Provide atomic __exchange_and_add
and __atomic_add.
Co-Authored-By: Richard Earnshaw <rearnsha@arm.com>
From-SVN: r58929
67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
// Low-level functions for atomic operations: Generic version -*- C++ -*-
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// Copyright (C) 1999, 2001, 2002 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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#include <bits/gthr.h>
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typedef int _Atomic_word;
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namespace __gnu_cxx
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{
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__gthread_mutex_t _Atomic_add_mutex __attribute__ ((__weak__))
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= __GTHREAD_MUTEX_INIT;
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}
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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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_Atomic_word __result;
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__gthread_mutex_lock (&__gnu_cxx::_Atomic_add_mutex);
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__result = *__mem;
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*__mem += __val;
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__gthread_mutex_unlock (&__gnu_cxx::_Atomic_add_mutex);
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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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(void) __exchange_and_add (__mem, __val);
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}
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#endif /* atomicity.h */
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