Topics trying to acquire pthread_mutex_lock (& mutex) What happens if they don't get a lock?

Question

C Programming:

What happens when a thread tries to obtain a mutex lock and does not receive it?

Does he fall asleep?

Will the thread wake up when pthread_mutex_unlock (& mutex); is called?

Then try to get the lock again?

+3

Bobby s Mar 11 '11 at 0:53

4 answers

, , .

pthread_mutex_trylock(pthread_mutex_t *mutex) EBUSY, - , 0, . (, , - )

+2

Brian Roach 11 . '11 1:05

pthread_mutex_lock , , , (). :

, . : (PTHREAD_MUTEX_NORMAL type) , , , , .

+1

R.. 11 . '11 1:21

, , .
(...)
mutex, mutex, pthread_mutex_unlock(), , , .

"result in" ,

( PTHREAD_MUTEX_RECURSIVE , , .)

0

Fred Foo 11 . '11 1:10

Carl Norum · Accepted Answer · 2011-03-11T01:00:24+0000

On the page :

The function blocks the mutex. If the mutex is already locked, the calling thread will block until the mutex is available. pthread_mutex_lock()

So, yes - your thread is blocked until the lock is available and it can receive it.

Topics trying to acquire pthread_mutex_lock (& ​​mutex) What happens if they don't get a lock?