/* * Copyright (C) 2000, 2001 Internet Software Consortium. * * Permission to use, copy, modify, and 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 INTERNET SOFTWARE CONSORTIUM * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL * INTERNET SOFTWARE CONSORTIUM 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 1.3 2001/01/09 21:57:55 bwelling 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 */