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/*
* Copyright (C) 2004, 2007 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 2000, 2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: mutex.h,v 1.6 2007/06/19 23:47:18 tbox Exp $ */
#ifndef ISC_MUTEX_H
#define ISC_MUTEX_H 1
#include <isc/result.h> /* for ISC_R_ codes */
typedef int isc_mutex_t;
#define isc_mutex_init(mp) \
(*(mp) = 0, ISC_R_SUCCESS)
#define isc_mutex_lock(mp) \
((*(mp))++ == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED)
#define isc_mutex_unlock(mp) \
(--(*(mp)) == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED)
#define isc_mutex_trylock(mp) \
(*(mp) == 0 ? ((*(mp))++, ISC_R_SUCCESS) : ISC_R_LOCKBUSY)
#define isc_mutex_destroy(mp) \
(*(mp) == 0 ? (*(mp) = -1, ISC_R_SUCCESS) : ISC_R_UNEXPECTED)
#define isc_mutex_stats(fp)
#endif /* ISC_MUTEX_H */
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