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Diffstat (limited to 'zbar/refcnt.h')
-rw-r--r-- | zbar/refcnt.h | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/zbar/refcnt.h b/zbar/refcnt.h new file mode 100644 index 0000000..259fab3 --- /dev/null +++ b/zbar/refcnt.h @@ -0,0 +1,90 @@ +/*------------------------------------------------------------------------ + * 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 |