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