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/*
* Atomic ops
* Copyright (C) 2008 Andreas Öman
*
* This program 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
* of the License, or (at your option) any later version.
*
* This program 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 program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef HTSATOMIC_H__
#define HTSATOMIC_H__
/**
* Atomically add 'incr' to *ptr and return the previous value
*/
#if defined(__i386__) || defined(__x86_64__)
static inline int
atomic_add(volatile int *ptr, int incr)
{
int r;
asm volatile("lock; xaddl %0, %1" :
"=r"(r), "=m"(*ptr) : "0" (incr), "m" (*ptr) : "memory");
return r;
}
#endif
#endif /* HTSATOMIC_H__ */
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