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Suppose there are two threads, the main thread and say thread B(created by main). If B acquired a mutex(say pthread_mutex) and it has called pthread_exit without unlocking the lock. So what happens to the mutex? Does it become free?
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Like any system resource that can be shared among threads, a mutex allocated on a thread's stack must be destroyed before the thread is terminated) actually does explicitly state this in their documentation.
Mutexes are used to protect shared resources. If the mutex is already locked by another thread, the thread waits for the mutex to become available. The thread that has locked a mutex becomes its current owner and remains the owner until the same thread has unlocked it.
The mutex object is destroyed when its last handle has been closed. It makes a loud bang.
When this kind of mutex is locked multiple times by the same thread, then unlock will decrement the count and no waiting thread is posted to continue running with the lock. If the count is decremented to zero, then the mutex is released and if any thread is waiting for it is posted.
nope. The mutex remaines locked. What actually happens to such a lock depends on its type, You can read about that here or here
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