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      1 /*	$NetBSD: cnd.c,v 1.1 2019/04/24 11:43:19 kamil Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2016 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Kamil Rytarowski.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __RCSID("$NetBSD: cnd.c,v 1.1 2019/04/24 11:43:19 kamil Exp $");
     34 
     35 #include <assert.h>
     36 #include <errno.h>
     37 #include <pthread.h>
     38 #include <threads.h>
     39 
     40 int
     41 cnd_broadcast(cnd_t *cond)
     42 {
     43 
     44 	_DIAGASSERT(cond != NULL);
     45 
     46 	if (pthread_cond_broadcast(cond) == 0)
     47 		return thrd_success;
     48 
     49 	return thrd_error;
     50 }
     51 
     52 void
     53 cnd_destroy(cnd_t *cond)
     54 {
     55 
     56 	_DIAGASSERT(cond != NULL);
     57 
     58 	/*
     59 	 * The cnd_destroy(3) function that conforms to C11 returns no value.
     60 	 */
     61 	(void)pthread_cond_destroy(cond);
     62 }
     63 
     64 int
     65 cnd_init(cnd_t *cond)
     66 {
     67 
     68 	_DIAGASSERT(cond != NULL);
     69 
     70 	if (pthread_cond_init(cond, NULL) == 0)
     71 		return thrd_success;
     72 
     73 	return thrd_error;
     74 }
     75 
     76 int
     77 cnd_signal(cnd_t *cond)
     78 {
     79 
     80 	_DIAGASSERT(cond != NULL);
     81 
     82 	if (pthread_cond_signal(cond) == 0)
     83 		return thrd_success;
     84 
     85 	return thrd_error;
     86 }
     87 
     88 int
     89 cnd_timedwait(cnd_t * __restrict cond, mtx_t * __restrict mtx,
     90             const struct timespec * __restrict ts)
     91 {
     92 
     93 	_DIAGASSERT(cond != NULL);
     94 	_DIAGASSERT(mtx != NULL);
     95 	_DIAGASSERT(ts != NULL);
     96 
     97 	switch (pthread_cond_timedwait(cond, mtx, ts)) {
     98 	case 0:
     99 		return thrd_success;
    100 	case ETIMEDOUT:
    101 		return thrd_timedout;
    102 	default:
    103 		return thrd_error;
    104 	}
    105 }
    106 
    107 int
    108 cnd_wait(cnd_t *cond, mtx_t *mtx)
    109 {
    110 
    111 	_DIAGASSERT(cond != NULL);
    112 	_DIAGASSERT(mtx != NULL);
    113 
    114 	if (pthread_cond_wait(cond, mtx) == 0)
    115 		return thrd_success;
    116 
    117 	return thrd_error;
    118 }
    119