40 lines
1.5 KiB
C
40 lines
1.5 KiB
C
/*
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* Copyright (C) 2004, 2007 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 2000, 2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: mutex.h,v 1.1.12.1 2015-03-31 09:17:14 lyang3 Exp $ */
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#ifndef ISC_MUTEX_H
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#define ISC_MUTEX_H 1
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#include <isc/result.h> /* for ISC_R_ codes */
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typedef int isc_mutex_t;
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#define isc_mutex_init(mp) \
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(*(mp) = 0, ISC_R_SUCCESS)
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#define isc_mutex_lock(mp) \
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((*(mp))++ == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED)
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#define isc_mutex_unlock(mp) \
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(--(*(mp)) == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED)
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#define isc_mutex_trylock(mp) \
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(*(mp) == 0 ? ((*(mp))++, ISC_R_SUCCESS) : ISC_R_LOCKBUSY)
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#define isc_mutex_destroy(mp) \
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(*(mp) == 0 ? (*(mp) = -1, ISC_R_SUCCESS) : ISC_R_UNEXPECTED)
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#define isc_mutex_stats(fp)
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#endif /* ISC_MUTEX_H */
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