/contrib/ntp/include/isc/mutex.h
C++ Header | 39 lines | 16 code | 6 blank | 17 comment | 4 complexity | 82890319828d2d42151c8aec355dac0a 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) 2000, 2001 Internet Software Consortium. 3 * 4 * Permission to use, copy, modify, and distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM 9 * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL 10 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL 11 * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, 12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING 13 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, 14 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 15 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18/* $Id: mutex.h,v 1.3 2001/01/09 21:57:55 bwelling 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 */