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fc6f0665ba
This library implements the C11 threads interface on top of the pthreads library. As discussed on the lists, the preferred way to implement this, is as a separate library. It is unlikely that these functions will be used a lot in the future. It would have been easier if the C11 working group standardized (a subset of) pthreads and clock_nanosleep(). Having it as a separate library allows the embedded people to omit it from their system. Discussed on: arch@, threads@
117 lines
2.7 KiB
C
117 lines
2.7 KiB
C
/*-
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* Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org>
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* All rights reserved.
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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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(void)pthread_mutex_destroy(mtx);
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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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pthread_mutexattr_t attr;
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int mt;
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switch (type) {
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case mtx_plain:
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case mtx_timed:
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mt = PTHREAD_MUTEX_NORMAL;
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break;
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case mtx_plain | mtx_recursive:
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case mtx_timed | mtx_recursive:
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mt = PTHREAD_MUTEX_RECURSIVE;
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break;
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default:
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return (thrd_error);
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}
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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, mt) != 0)
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return (thrd_error);
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if (pthread_mutex_init(mtx, &attr) != 0)
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return (thrd_error);
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return (thrd_success);
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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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if (pthread_mutex_lock(mtx) != 0)
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return (thrd_error);
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return (thrd_success);
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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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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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switch (pthread_mutex_lock(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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if (pthread_mutex_unlock(mtx) != 0)
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return (thrd_error);
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return (thrd_success);
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}
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