90 lines
1.6 KiB
C++
90 lines
1.6 KiB
C++
/*
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* Copyright © 2016 Mozilla Foundation
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*
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* This program is made available under an ISC-style license. See the
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* accompanying file LICENSE for details.
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*/
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#if !defined(CUBEB_UTILS_UNIX)
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#define CUBEB_UTILS_UNIX
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#include <pthread.h>
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#include <errno.h>
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#include <stdio.h>
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/* This wraps a critical section to track the owner in debug mode. */
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class owned_critical_section
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{
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public:
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owned_critical_section()
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{
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pthread_mutexattr_t attr;
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pthread_mutexattr_init(&attr);
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#ifndef NDEBUG
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
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#else
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_NORMAL);
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#endif
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#ifndef NDEBUG
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int r =
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#endif
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pthread_mutex_init(&mutex, &attr);
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#ifndef NDEBUG
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assert(r == 0);
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#endif
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pthread_mutexattr_destroy(&attr);
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}
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~owned_critical_section()
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{
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#ifndef NDEBUG
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int r =
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#endif
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pthread_mutex_destroy(&mutex);
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#ifndef NDEBUG
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assert(r == 0);
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#endif
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}
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void enter()
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{
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#ifndef NDEBUG
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int r =
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#endif
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pthread_mutex_lock(&mutex);
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#ifndef NDEBUG
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assert(r == 0 && "Deadlock");
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#endif
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}
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void leave()
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{
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#ifndef NDEBUG
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int r =
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#endif
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pthread_mutex_unlock(&mutex);
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#ifndef NDEBUG
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assert(r == 0 && "Unlocking unlocked mutex");
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#endif
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}
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void assert_current_thread_owns()
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{
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#ifndef NDEBUG
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int r = pthread_mutex_lock(&mutex);
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assert(r == EDEADLK);
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#endif
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}
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private:
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pthread_mutex_t mutex;
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// Disallow copy and assignment because pthread_mutex_t cannot be copied.
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owned_critical_section(const owned_critical_section&);
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owned_critical_section& operator=(const owned_critical_section&);
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};
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#endif /* CUBEB_UTILS_UNIX */
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