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PTHREAD_MUTEX_LOCK(3) Library Functions Manual PTHREAD_MUTEX_LOCK(3)

pthread_mutex_lock
lock a mutex

#include <pthread.h>

int
pthread_mutex_lock(pthread_mutex_t *mutex);

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

If successful, pthread_mutex_lock() will return zero, otherwise an error number will be returned to indicate the error.

pthread_mutex_lock() will fail if:
[]
The value specified by mutex is invalid.
[]
A deadlock would occur if the thread blocked waiting for mutex.

pthread_mutex_destroy(3), pthread_mutex_init(3), pthread_mutex_trylock(3), pthread_mutex_unlock(3)

pthread_mutex_lock() conforms to ISO/IEC 9945-1:1996 (“POSIX.1”).
July 26, 2007 OpenBSD-5.1