1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #include <errno.h> 31 #include <pthread.h> 32 33 #include "threads.h" 34 35 void 36 mtx_destroy(mtx_t *mtx) 37 { 38 39 (void)pthread_mutex_destroy(mtx); 40 } 41 42 int 43 mtx_init(mtx_t *mtx, int type) 44 { 45 pthread_mutexattr_t attr; 46 int mt, res; 47 48 switch (type) { 49 case mtx_plain: 50 case mtx_timed: 51 mt = PTHREAD_MUTEX_NORMAL; 52 break; 53 case mtx_plain | mtx_recursive: 54 case mtx_timed | mtx_recursive: 55 mt = PTHREAD_MUTEX_RECURSIVE; 56 break; 57 default: 58 return (thrd_error); 59 } 60 61 if (pthread_mutexattr_init(&attr) != 0) 62 return (thrd_error); 63 res = thrd_success; 64 if (pthread_mutexattr_settype(&attr, mt) != 0 || 65 pthread_mutex_init(mtx, &attr) != 0) 66 res = thrd_error; 67 pthread_mutexattr_destroy(&attr); 68 return (res); 69 } 70 71 int 72 mtx_lock(mtx_t *mtx) 73 { 74 75 if (pthread_mutex_lock(mtx) != 0) 76 return (thrd_error); 77 return (thrd_success); 78 } 79 80 int 81 mtx_timedlock(mtx_t *restrict mtx, const struct timespec *restrict ts) 82 { 83 84 switch (pthread_mutex_timedlock(mtx, ts)) { 85 case 0: 86 return (thrd_success); 87 case ETIMEDOUT: 88 return (thrd_timedout); 89 default: 90 return (thrd_error); 91 } 92 } 93 94 int 95 mtx_trylock(mtx_t *mtx) 96 { 97 98 switch (pthread_mutex_trylock(mtx)) { 99 case 0: 100 return (thrd_success); 101 case EBUSY: 102 return (thrd_busy); 103 default: 104 return (thrd_error); 105 } 106 } 107 108 int 109 mtx_unlock(mtx_t *mtx) 110 { 111 112 if (pthread_mutex_unlock(mtx) != 0) 113 return (thrd_error); 114 return (thrd_success); 115 } 116