Performs a semaphore lock.

    This function is supported on OpenVMS Integrity servers and
    Alpha only.

    Format

      #include  <semaphore.h>

      #include  <time.h>

      int sem_timedwait  (sem_t *sem, const struct timespec
                         *abs_timeout);

  Additional Information (explode) :

• Argument
• Description
• Return Values