Why Pthread mutex init is used?

The pthread_mutex_init() function initializes a mutex with the specified attributes for use. The new mutex may be used immediately for serializing critical resources. If attr is specified as NULL, all attributes are set to the default mutex attributes for the newly created mutex.

Is Pthread mutex lock blocking?

The pthread_mutex_lock() function locks mutex. If the mutex is already locked, the calling thread will block until the mutex becomes available. So yes – your thread is blocked until the lock is available and it can obtain it.

Does Pthread mutex lock wait?

It can easily be extended to many threads, by allocating one int , pthread_cond_t and pthread_mutex_t per thread. pthread_cond_wait() blocks the calling thread until the specified condition is signalled. This routine should be called while mutex is locked, and it will automatically release the mutex while it waits.

How do you initialize mutex?

A mutex can be statically initialized by assigning PTHREAD_MUTEX_INITIALIZER in its definition, as follows: pthread_mutex_t def_mutex = PTHREAD_MUTEX_INITIALIZER; A mutex must be initialized (either by calling pthread_mutex_init(), or statically) before it may be used in any other mutex functions.

What does Pthread exit do?

The pthread_exit() function terminates the calling thread and makes the value value_ptr available to any successful join with the terminating thread. Any cancellation cleanup handlers that have been pushed and not yet popped are popped in the reverse order that they were pushed and then executed.

How does Pthread mutex lock work?

int pthread_mutex_lock(pthread_mutex_t *mutex) : Locks a mutex object, which identifies a mutex. 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.

Is Pthread mutex reentrant?

A recursive mutex is not necessarily reentrant, i.e. calling pthread_mutex_lock from a signal handler that interrupted pthread_mutex_lock invokes undefined behavior. It is however possible to implement pthread_mutex_lock in a reentrant way; see my implementation in musl libc for an example of how it can be done.

What does Pthread create do?

The pthread_create() function is used to create a new thread, with attributes specified by attr, within a process. If attr is NULL, the default attributes are used. Upon successful completion, pthread_create() stores the ID of the created thread in the location referenced by thread.