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atomicity.h: Provide atomic __exchange_and_add and __atomic_add.

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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
This commit is contained in:
Phil Edwards 2002-11-08 19:24:41 +00:00
parent bce582242d
commit 7069c22117
2 changed files with 27 additions and 6 deletions
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6
libstdc++-v3/ChangeLog
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@ -1,3 +1,9 @@
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.
2002-11-08 Paolo Carlini <pcarlini@unitus.it>
* config/locale/gnu/monetary_members.cc

27
libstdc++-v3/config/cpu/generic/atomicity.h
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@ -1,6 +1,6 @@
// Low-level functions for atomic operations: Generic version -*- C++ -*-
// Copyright (C) 1999, 2001 Free Software Foundation, Inc.
// Copyright (C) 1999, 2001, 2002 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
@ -30,22 +30,37 @@
#ifndef _BITS_ATOMICITY_H
#define _BITS_ATOMICITY_H 1
#include <bits/gthr.h>
typedef int _Atomic_word;
namespace __gnu_cxx
{
__gthread_mutex_t _Atomic_add_mutex __attribute__ ((__weak__))
= __GTHREAD_MUTEX_INIT;
}
static inline _Atomic_word
__attribute__ ((__unused__))
__exchange_and_add (_Atomic_word* __mem, int __val)
__exchange_and_add (volatile _Atomic_word* __mem, int __val)
{
_Atomic_word __result = *__mem;
*__mem += __val;
_Atomic_word __result;
__gthread_mutex_lock (&__gnu_cxx::_Atomic_add_mutex);
__result = *__mem;
*__mem += __val;
__gthread_mutex_unlock (&__gnu_cxx::_Atomic_add_mutex);
return __result;
}
static inline void
__attribute__ ((__unused__))
__atomic_add (_Atomic_word* __mem, int __val)
__atomic_add (volatile _Atomic_word* __mem, int __val)
{
*__mem += __val;
(void) __exchange_and_add (__mem, __val);
}
#endif /* atomicity.h */