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Support for atomic operations on integers

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For threading support, add atomic add and sub operations working on
integers. Base this on locking support provided by virMutex.
This commit is contained in:
Stefan Berger 2012-04-19 10:21:43 -04:00 committed by Stefan Berger
parent 6241eed3db
commit 71bc80b60e
1 changed files with 91 additions and 0 deletions
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91
src/util/viratomic.h Normal file
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/*
* viratomic.h: atomic integer operations
*
* Copyright (C) 2012 IBM Corporation
*
* Authors:
* Stefan Berger <stefanb@linux.vnet.ibm.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef __VIR_ATOMIC_H__
# define __VIR_ATOMIC_H__
# include "threads.h"
typedef struct _virAtomicInt virAtomicInt;
typedef virAtomicInt *virAtomicIntPtr;
struct _virAtomicInt {
virMutex lock;
int value;
};
static inline int
virAtomicIntInit(virAtomicIntPtr vaip)
{
vaip->value = 0;
return virMutexInit(&vaip->lock);
}
static inline void
virAtomicIntSet(virAtomicIntPtr vaip, int value)
{
virMutexLock(&vaip->lock);
vaip->value = value;
virMutexUnlock(&vaip->lock);
}
static inline int
virAtomicIntRead(virAtomicIntPtr vaip)
{
return vaip->value;
}
static inline int
virAtomicIntAdd(virAtomicIntPtr vaip, int add)
{
int ret;
virMutexLock(&vaip->lock);
vaip->value += add;
ret = vaip->value;
virMutexUnlock(&vaip->lock);
return ret;
}
static inline int
virAtomicIntSub(virAtomicIntPtr vaip, int sub)
{
int ret;
virMutexLock(&vaip->lock);
vaip->value -= sub;
ret = vaip->value;
virMutexUnlock(&vaip->lock);
return ret;
}
#endif /* __VIR_ATOMIC_H */