VMS Help POSIX Threads, TIS routines, tis_mutex_lock  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Locks an unlocked mutex.

1 - C Binding

    #include <tis.h>

    int
    tis_mutex_lock (
                pthread_mutex_t   *mutex);

2 - Arguments

 mutex

    Address of the mutex (passed by reference) to be locked.

3 - Description

    This routine locks the specified mutex mutex. A deadlock can
    result if the owner of a mutex calls this routine in an attempt
    to lock the same mutex a second time. (The Threads Library may
    not detect or report the deadlock.)

    In a threaded environment, the thread that has locked a mutex
    becomes its current owner and remains the owner until the same
    thread has unlocked it. This routine returns with the mutex
    in the locked state and with the current thread as the mutex's
    current owner.

4 - Return Values

    If an error condition occurs, this routine returns an integer
    value indicating the type of error. Possible return values are as
    follows:

    Return      Description

    0           Successful completion.
    [EDEADLK]   A deadlock condition is detected.
    [EINVAL]    The value specified by mutex is not a valid mutex.

5 - Associated Routines

       tis_mutex_destroy()
       tis_mutex_init()
       tis_mutex_trylock()
       tis_mutex_unlock()