162 lines
3.5 KiB
C
162 lines
3.5 KiB
C
/* $NetBSD: mtx.c,v 1.1 2019/04/24 11:43:19 kamil Exp $ */
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/*-
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* Copyright (c) 2016 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Kamil Rytarowski.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: mtx.c,v 1.1 2019/04/24 11:43:19 kamil Exp $");
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#include <assert.h>
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#include <errno.h>
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#include <pthread.h>
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#include <threads.h>
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void
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mtx_destroy(mtx_t *mtx)
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{
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_DIAGASSERT(mtx != NULL);
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/*
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* The cnd_destroy(3) function that conforms to C11 returns no value.
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*/
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(void)pthread_mutex_destroy(mtx);
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}
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static inline int
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mtx_init_default(mtx_t *mtx)
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{
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_DIAGASSERT(mtx != NULL);
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if (pthread_mutex_init(mtx, NULL) != 0)
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return thrd_error;
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return thrd_success;
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}
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static inline int
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mtx_init_recursive(mtx_t *mtx)
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{
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pthread_mutexattr_t attr;
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_DIAGASSERT(mtx != NULL);
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if (pthread_mutexattr_init(&attr) != 0)
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return thrd_error;
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if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) != 0) {
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pthread_mutexattr_destroy(&attr);
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return thrd_error;
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}
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if (pthread_mutex_init(mtx, &attr) == 0)
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return thrd_success;
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pthread_mutexattr_destroy(&attr);
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return thrd_error;
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}
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int
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mtx_init(mtx_t *mtx, int type)
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{
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_DIAGASSERT(mtx != NULL);
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switch (type) {
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case mtx_plain:
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case mtx_timed:
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return mtx_init_default(mtx);
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case mtx_plain | mtx_recursive:
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case mtx_timed | mtx_recursive:
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return mtx_init_recursive(mtx);
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default:
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return thrd_error;
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}
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}
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int
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mtx_lock(mtx_t *mtx)
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{
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_DIAGASSERT(mtx != NULL);
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if (pthread_mutex_lock(mtx) == 0)
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return thrd_success;
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return thrd_error;
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}
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int
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mtx_timedlock(mtx_t *__restrict mtx, const struct timespec *__restrict ts)
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{
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_DIAGASSERT(mtx != NULL);
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_DIAGASSERT(ts != NULL);
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switch(pthread_mutex_timedlock(mtx, ts)) {
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case 0:
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return thrd_success;
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case ETIMEDOUT:
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return thrd_timedout;
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default:
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return thrd_error;
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}
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}
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int
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mtx_trylock(mtx_t *mtx)
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{
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_DIAGASSERT(mtx != NULL);
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switch(pthread_mutex_trylock(mtx)) {
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case 0:
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return thrd_success;
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case EBUSY:
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return thrd_busy;
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default:
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return thrd_error;
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}
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}
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int
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mtx_unlock(mtx_t *mtx)
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{
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_DIAGASSERT(mtx != NULL);
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if (pthread_mutex_unlock(mtx) == 0)
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return thrd_success;
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return thrd_error;
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}
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