77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
/*
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* Copyright (C) 2009-2013 Max Kellermann <max@duempel.org>
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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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*
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* - 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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*
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* - 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
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* 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
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef THREAD_POSIX_MUTEX_HXX
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#define THREAD_POSIX_MUTEX_HXX
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#include <pthread.h>
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/**
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* Low-level wrapper for a pthread_mutex_t.
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*/
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class PosixMutex {
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friend class PosixCond;
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pthread_mutex_t mutex;
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public:
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#ifdef __GLIBC__
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/* optimized constexpr constructor for pthread implementations
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that support it */
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constexpr PosixMutex():mutex(PTHREAD_MUTEX_INITIALIZER) {}
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#else
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/* slow fallback for pthread implementations that are not
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compatible with "constexpr" */
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PosixMutex() {
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pthread_mutex_init(&mutex, nullptr);
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}
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~PosixMutex() {
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pthread_mutex_destroy(&mutex);
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}
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#endif
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PosixMutex(const PosixMutex &other) = delete;
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PosixMutex &operator=(const PosixMutex &other) = delete;
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void lock() {
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pthread_mutex_lock(&mutex);
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}
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bool try_lock() {
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return pthread_mutex_trylock(&mutex) == 0;
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}
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void unlock() {
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pthread_mutex_unlock(&mutex);
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}
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};
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#endif
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