cpukit/libstdthreads/mtx.c

0001 /*-
0002  * Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org>
0003  * Copyright (c) 2015 embedded brains GmbH & Co. KG
0004  * All rights reserved.
0005  *
0006  * Redistribution and use in source and binary forms, with or without
0007  * modification, are permitted provided that the following conditions
0008  * are met:
0009  * 1. Redistributions of source code must retain the above copyright
0010  *    notice, this list of conditions and the following disclaimer.
0011  * 2. Redistributions in binary form must reproduce the above copyright
0012  *    notice, this list of conditions and the following disclaimer in the
0013  *    documentation and/or other materials provided with the distribution.
0014  *
0015  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
0016  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0017  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0018  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
0019  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
0020  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
0021  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
0022  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
0023  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
0024  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
0025  * SUCH DAMAGE.
0026  *
0027  * $FreeBSD r279326 2015-02-26T16:39:57Z$
0028  */
0029
0030 #include <threads.h>
0031 #include <sys/lock.h>
0032 #include <errno.h>
0033
0034 void
0035 mtx_destroy(mtx_t *mtx)
0036 {
0037
0038     _Mutex_recursive_Destroy(mtx);
0039 }
0040
0041 int
0042 mtx_init(mtx_t *mtx, int type)
0043 {
0044
0045     (void)type;
0046     _Mutex_recursive_Initialize(mtx);
0047     return (thrd_success);
0048 }
0049
0050 int
0051 mtx_lock(mtx_t *mtx)
0052 {
0053
0054     _Mutex_recursive_Acquire(mtx);
0055     return (thrd_success);
0056 }
0057
0058 int
0059 mtx_timedlock(mtx_t *__restrict mtx, const struct timespec *__restrict ts)
0060 {
0061
0062     switch (_Mutex_recursive_Acquire_timed(mtx, ts)) {
0063     case 0:
0064         return (thrd_success);
0065     case ETIMEDOUT:
0066         return (thrd_timedout);
0067     default:
0068         return (thrd_error);
0069     }
0070 }
0071
0072 int
0073 mtx_trylock(mtx_t *mtx)
0074 {
0075
0076     switch (_Mutex_recursive_Try_acquire(mtx)) {
0077     case 0:
0078         return (thrd_success);
0079     default:
0080         return (thrd_busy);
0081     }
0082 }
0083
0084 int
0085 mtx_unlock(mtx_t *mtx)
0086 {
0087
0088     _Mutex_recursive_Release(mtx);
0089     return (thrd_success);
0090 }