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/*------------------------------------------------------------------------
* Copyright 2007-2010 (c) Jeff Brown <spadix@users.sourceforge.net>
*
* This file is part of the ZBar Bar Code Reader.
*
* The ZBar Bar Code Reader is free software; you can redistribute it
* and/or modify it under the terms of the GNU Lesser Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* The ZBar Bar Code Reader 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 Public License for more details.
*
* You should have received a copy of the GNU Lesser Public License
* along with the ZBar Bar Code Reader; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* http://sourceforge.net/projects/zbar
*------------------------------------------------------------------------*/
#ifndef _REFCNT_H_
#define _REFCNT_H_
#include <config.h>
#include <assert.h>
#if defined(_WIN32)
# include <windows.h>
typedef LONG refcnt_t;
static inline int _zbar_refcnt (refcnt_t *cnt,
int delta)
{
int rc = -1;
if(delta > 0)
while(delta--)
rc = InterlockedIncrement(cnt);
else if(delta < 0)
while(delta++)
rc = InterlockedDecrement(cnt);
assert(rc >= 0);
return(rc);
}
#elif defined(TARGET_OS_MAC)
# include <libkern/OSAtomic.h>
typedef int32_t refcnt_t;
static inline int _zbar_refcnt (refcnt_t *cnt,
int delta)
{
int rc = OSAtomicAdd32Barrier(delta, cnt);
assert(rc >= 0);
return(rc);
}
#elif defined(HAVE_LIBPTHREAD)
# include <pthread.h>
typedef int refcnt_t;
extern pthread_mutex_t _zbar_reflock;
static inline int _zbar_refcnt (refcnt_t *cnt,
int delta)
{
pthread_mutex_lock(&_zbar_reflock);
int rc = (*cnt += delta);
pthread_mutex_unlock(&_zbar_reflock);
assert(rc >= 0);
return(rc);
}
#else
typedef int refcnt_t;
static inline int _zbar_refcnt (refcnt_t *cnt,
int delta)
{
int rc = (*cnt += delta);
assert(rc >= 0);
return(rc);
}
#endif
void _zbar_refcnt_init(void);
#endif
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