/contrib/bind9/lib/isc/nothreads/include/isc/mutex.h
C++ Header | 39 lines | 16 code | 6 blank | 17 comment | 4 complexity | a01cfaa50ad2a04fd1bec8787ce07bf4 MD5 | raw file
Possible License(s): MPL-2.0-no-copyleft-exception, BSD-3-Clause, LGPL-2.0, LGPL-2.1, BSD-2-Clause, 0BSD, JSON, AGPL-1.0, GPL-2.0
1/* 2 * Copyright (C) 2004, 2007 Internet Systems Consortium, Inc. ("ISC") 3 * Copyright (C) 2000, 2001 Internet Software Consortium. 4 * 5 * Permission to use, copy, modify, and/or distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 15 * PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18/* $Id: mutex.h,v 1.6 2007/06/19 23:47:18 tbox Exp $ */ 19 20#ifndef ISC_MUTEX_H 21#define ISC_MUTEX_H 1 22 23#include <isc/result.h> /* for ISC_R_ codes */ 24 25typedef int isc_mutex_t; 26 27#define isc_mutex_init(mp) \ 28 (*(mp) = 0, ISC_R_SUCCESS) 29#define isc_mutex_lock(mp) \ 30 ((*(mp))++ == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED) 31#define isc_mutex_unlock(mp) \ 32 (--(*(mp)) == 0 ? ISC_R_SUCCESS : ISC_R_UNEXPECTED) 33#define isc_mutex_trylock(mp) \ 34 (*(mp) == 0 ? ((*(mp))++, ISC_R_SUCCESS) : ISC_R_LOCKBUSY) 35#define isc_mutex_destroy(mp) \ 36 (*(mp) == 0 ? (*(mp) = -1, ISC_R_SUCCESS) : ISC_R_UNEXPECTED) 37#define isc_mutex_stats(fp) 38 39#endif /* ISC_MUTEX_H */