1 /* $NetBSD: mutex.h,v 1.4 2014/12/10 04:38:00 christos Exp $ */ 2 3 /* 4 * Copyright (C) 2004, 2007 Internet Systems Consortium, Inc. ("ISC") 5 * Copyright (C) 2000, 2001 Internet Software Consortium. 6 * 7 * Permission to use, copy, modify, and/or distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 13 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 17 * PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 /* Id: mutex.h,v 1.6 2007/06/19 23:47:18 tbox Exp */ 21 22 #ifndef ISC_MUTEX_H 23 #define ISC_MUTEX_H 1 24 25 #include <isc/result.h> /* for ISC_R_ codes */ 26 27 typedef int isc_mutex_t; 28 29 #define isc_mutex_init(mp) \ 30 (*(mp) = 0, ISC_R_SUCCESS) 31 #define isc_mutex_lock(mp) \ 32 ((*(mp))++ == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED) 33 #define isc_mutex_unlock(mp) \ 34 (--(*(mp)) == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED) 35 #define isc_mutex_trylock(mp) \ 36 (*(mp) == 0 ? ((*(mp))++, ISC_R_SUCCESS) : ISC_R_LOCKBUSY) 37 #define isc_mutex_destroy(mp) \ 38 (*(mp) == 0 ? (*(mp) = -1, ISC_R_SUCCESS) : ISC_R_UNEXPECTED) 39 #define isc_mutex_stats(fp) 40 41 #endif /* ISC_MUTEX_H */ 42