a9ca1710c0
C11 Thread support library is a portable threading C API between OSs, similar to std::threads in the C++ world. The library is implemented as a thin shim over POSIX interfaces. NetBSD implements the API as a part of the POSIX threading library (libpthread(3)). C11 threads(3) are in the process of making them an integral part of the POSIX standard. The interface has been implemented in major OSs and used with stopgap libraries for older versions of them. C11 threading library is already used (with a stopgap implementation) in the NetBSD distribution in MESA. Original implementation by myself from 2016. ATF tests are new and cover almost all interfaces. Proposed on tech-userlevel@.
119 lines
2.8 KiB
C
119 lines
2.8 KiB
C
/* $NetBSD: cnd.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: cnd.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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int
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cnd_broadcast(cnd_t *cond)
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{
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_DIAGASSERT(cond != NULL);
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if (pthread_cond_broadcast(cond) == 0)
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return thrd_success;
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return thrd_error;
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}
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void
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cnd_destroy(cnd_t *cond)
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{
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_DIAGASSERT(cond != 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_cond_destroy(cond);
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}
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int
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cnd_init(cnd_t *cond)
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{
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_DIAGASSERT(cond != NULL);
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if (pthread_cond_init(cond, NULL) == 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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cnd_signal(cnd_t *cond)
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{
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_DIAGASSERT(cond != NULL);
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if (pthread_cond_signal(cond) == 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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cnd_timedwait(cnd_t * __restrict cond, mtx_t * __restrict mtx,
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const struct timespec * __restrict ts)
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{
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_DIAGASSERT(cond != NULL);
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_DIAGASSERT(mtx != NULL);
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_DIAGASSERT(ts != NULL);
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switch (pthread_cond_timedwait(cond, 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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cnd_wait(cnd_t *cond, mtx_t *mtx)
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{
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_DIAGASSERT(cond != NULL);
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_DIAGASSERT(mtx != NULL);
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if (pthread_cond_wait(cond, mtx) == 0)
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return thrd_success;
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return thrd_error;
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}
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