NAME    [Toc]    [Back]

     pthread_mutex_lock - lock a mutex

SYNOPSIS    [Toc]    [Back]

     #include <pthread.h>

     int
     pthread_mutex_lock(pthread_mutex_t *mutex);

DESCRIPTION    [Toc]    [Back]

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

RETURN VALUES    [Toc]    [Back]

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

ERRORS    [Toc]    [Back]

     pthread_mutex_lock() will fail if:

     [EINVAL]      The value specified by mutex is invalid.

     [EDEADLK]      A  deadlock would occur if the thread blocked
waiting for
                   mutex.

SEE ALSO    [Toc]    [Back]

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

STANDARDS    [Toc]    [Back]

     pthread_mutex_lock()   conforms   to   ISO/IEC   9945-1:1996
(``POSIX'').

OpenBSD      3.6                           July      30,     1998