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/*------------------------------------------------------------------------
* Copyright 2007-2009 (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 _ZBAR_MUTEX_H_
#define _ZBAR_MUTEX_H_
#include "config.h"
#include <assert.h>
/* simple platform mutex abstraction
*/
#if defined(_WIN32)
#include <windows.h>
#define DEBUG_LOCKS
#ifdef DEBUG_LOCKS
typedef struct zbar_mutex_s {
int count;
CRITICAL_SECTION mutex;
} zbar_mutex_t;
static inline int _zbar_mutex_init(zbar_mutex_t *lock)
{
lock->count = 1;
InitializeCriticalSection(&lock->mutex);
return (0);
}
static inline void _zbar_mutex_destroy(zbar_mutex_t *lock)
{
DeleteCriticalSection(&lock->mutex);
}
static inline int _zbar_mutex_lock(zbar_mutex_t *lock)
{
EnterCriticalSection(&lock->mutex);
if (lock->count++ < 1)
assert(0);
return (0);
}
static inline int _zbar_mutex_unlock(zbar_mutex_t *lock)
{
if (lock->count-- <= 1)
assert(0);
LeaveCriticalSection(&lock->mutex);
return (0);
}
#else
typedef CRITICAL_SECTION zbar_mutex_t;
static inline int _zbar_mutex_init(zbar_mutex_t *lock)
{
InitializeCriticalSection(lock);
return (0);
}
static inline void _zbar_mutex_destroy(zbar_mutex_t *lock)
{
DeleteCriticalSection(lock);
}
static inline int _zbar_mutex_lock(zbar_mutex_t *lock)
{
EnterCriticalSection(lock);
return (0);
}
static inline int _zbar_mutex_unlock(zbar_mutex_t *lock)
{
LeaveCriticalSection(lock);
return (0);
}
#endif
#elif defined(HAVE_LIBPTHREAD)
#include <pthread.h>
typedef pthread_mutex_t zbar_mutex_t;
static inline int _zbar_mutex_init(zbar_mutex_t *lock)
{
#ifdef DEBUG_LOCKS
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
int rc = pthread_mutex_init(lock, &attr);
pthread_mutexattr_destroy(&attr);
return (rc);
#else
return (pthread_mutex_init(lock, NULL));
#endif
}
static inline void _zbar_mutex_destroy(zbar_mutex_t *lock)
{
pthread_mutex_destroy(lock);
}
static inline int _zbar_mutex_lock(zbar_mutex_t *lock)
{
int rc = pthread_mutex_lock(lock);
#ifdef DEBUG_LOCKS
assert(!rc);
#endif
/* FIXME save system code */
/*rc = err_capture(proc, SEV_ERROR, ZBAR_ERR_LOCKING, __func__,
"unable to lock processor");*/
return (rc);
}
static inline int _zbar_mutex_unlock(zbar_mutex_t *lock)
{
int rc = pthread_mutex_unlock(lock);
#ifdef DEBUG_LOCKS
assert(!rc);
#endif
/* FIXME save system code */
return (rc);
}
#else
typedef int zbar_mutex_t[0];
#define _zbar_mutex_init(l) -1
#define _zbar_mutex_destroy(l)
#define _zbar_mutex_lock(l) 0
#define _zbar_mutex_unlock(l) 0
#endif
#endif
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