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atomicity.h: New file. 

2003-04-29 Joel Sherrill  <joel.sherrill@OARcorp.com>
	   Loren J. Rittle <ljrittle@acm.org>
	   Martin v. Loewis  <martin@v.loewis.de>

	* config/cpu/i386/atomicity.h: New file.

Co-Authored-By: Loren J. Rittle <ljrittle@acm.org>
Co-Authored-By: Martin v. Loewis <martin@v.loewis.de>

From-SVN: r66261
This commit is contained in:
Joel Sherrill 2003-04-29 21:57:39 +00:00 committed by Loren J. Rittle
parent 0219237c53
commit 51dc3d74f8
2 changed files with 81 additions and 0 deletions
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libstdc++-v3/ChangeLog
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@ -1,3 +1,9 @@
2003-04-29 Joel Sherrill <joel.sherrill@OARcorp.com>
Loren J. Rittle <ljrittle@acm.org>
Martin v. Loewis <martin@v.loewis.de>
* config/cpu/i386/atomicity.h: New file.
2003-04-29 Paolo Carlini <pcarlini@unitus.it>
* include/bits/fstream.tcc (open): Change to single return.

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libstdc++-v3/config/cpu/i386/atomicity.h Normal file
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// Low-level functions for atomic operations: x86, x >= 3 version -*- C++ -*-
// Copyright (C) 2003 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 2, 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.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
#ifndef _BITS_ATOMICITY_H
#define _BITS_ATOMICITY_H 1
typedef int _Atomic_word;
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;
static inline _Atomic_word
__attribute__ ((__unused__))
__exchange_and_add (volatile _Atomic_word *__mem, int __val)
{
register _Atomic_word __result, __tmp = 1;
/* obtain the atomic exchange/add spin lock */
do {
__asm__ __volatile__ ("xchgl %0,%1"
: "+m" (__Atomicity_lock<0>::_S_atomicity_lock),
"+r" (__tmp));
} while (__tmp);
__result = *__mem;
*__mem += __val;
/* release spin lock */
__Atomicity_lock<0>::_S_atomicity_lock = 0;
return __result;
}
static inline void
__attribute__ ((__unused__))
__atomic_add (volatile _Atomic_word* __mem, int __val)
{
__exchange_and_add (__mem, __val);
}
#endif /* atomicity.h */