1*00b67f09SDavid van Moolenbroek /* $NetBSD: mutex.h,v 1.4 2014/12/10 04:38:00 christos Exp $ */ 2*00b67f09SDavid van Moolenbroek 3*00b67f09SDavid van Moolenbroek /* 4*00b67f09SDavid van Moolenbroek * Copyright (C) 2004, 2007 Internet Systems Consortium, Inc. ("ISC") 5*00b67f09SDavid van Moolenbroek * Copyright (C) 2000, 2001 Internet Software Consortium. 6*00b67f09SDavid van Moolenbroek * 7*00b67f09SDavid van Moolenbroek * Permission to use, copy, modify, and/or distribute this software for any 8*00b67f09SDavid van Moolenbroek * purpose with or without fee is hereby granted, provided that the above 9*00b67f09SDavid van Moolenbroek * copyright notice and this permission notice appear in all copies. 10*00b67f09SDavid van Moolenbroek * 11*00b67f09SDavid van Moolenbroek * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 12*00b67f09SDavid van Moolenbroek * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 13*00b67f09SDavid van Moolenbroek * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 14*00b67f09SDavid van Moolenbroek * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 15*00b67f09SDavid van Moolenbroek * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 16*00b67f09SDavid van Moolenbroek * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 17*00b67f09SDavid van Moolenbroek * PERFORMANCE OF THIS SOFTWARE. 18*00b67f09SDavid van Moolenbroek */ 19*00b67f09SDavid van Moolenbroek 20*00b67f09SDavid van Moolenbroek /* Id: mutex.h,v 1.6 2007/06/19 23:47:18 tbox Exp */ 21*00b67f09SDavid van Moolenbroek 22*00b67f09SDavid van Moolenbroek #ifndef ISC_MUTEX_H 23*00b67f09SDavid van Moolenbroek #define ISC_MUTEX_H 1 24*00b67f09SDavid van Moolenbroek 25*00b67f09SDavid van Moolenbroek #include <isc/result.h> /* for ISC_R_ codes */ 26*00b67f09SDavid van Moolenbroek 27*00b67f09SDavid van Moolenbroek typedef int isc_mutex_t; 28*00b67f09SDavid van Moolenbroek 29*00b67f09SDavid van Moolenbroek #define isc_mutex_init(mp) \ 30*00b67f09SDavid van Moolenbroek (*(mp) = 0, ISC_R_SUCCESS) 31*00b67f09SDavid van Moolenbroek #define isc_mutex_lock(mp) \ 32*00b67f09SDavid van Moolenbroek ((*(mp))++ == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED) 33*00b67f09SDavid van Moolenbroek #define isc_mutex_unlock(mp) \ 34*00b67f09SDavid van Moolenbroek (--(*(mp)) == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED) 35*00b67f09SDavid van Moolenbroek #define isc_mutex_trylock(mp) \ 36*00b67f09SDavid van Moolenbroek (*(mp) == 0 ? ((*(mp))++, ISC_R_SUCCESS) : ISC_R_LOCKBUSY) 37*00b67f09SDavid van Moolenbroek #define isc_mutex_destroy(mp) \ 38*00b67f09SDavid van Moolenbroek (*(mp) == 0 ? (*(mp) = -1, ISC_R_SUCCESS) : ISC_R_UNEXPECTED) 39*00b67f09SDavid van Moolenbroek #define isc_mutex_stats(fp) 40*00b67f09SDavid van Moolenbroek 41*00b67f09SDavid van Moolenbroek #endif /* ISC_MUTEX_H */ 42