DECthreads also provides routines that implement nonportable extensions
  to the POSIX 1003.1c standard.  These routines are grouped into these
  functional categories:

1  –  Thread Execution Routines

   pthread_delay_np        Causes a thread to delay execution.

   pthread_get_expiration_np
                           Obtains a value representing a desired
                           expiration time.

   pthread_getsequence_np  Obtains the thread sequence number.

2  –  Thread Attributes Routines

   pthread_attr_getguardsize_np
                           Obtains the guardsize attribute of the
                           specified thread attributes object.

   pthread_attr_setguardsize_np
                           Changes the guardsize attribute of the
                           specified thread attributes object.

3  –  DECthreads Global Mutex Routines

   pthread_lock_global_np  Locks the DECthreads global mutex if it
                           is unlocked.

   pthread_unlock_global_np
                           Unlocks the DECthreads lobal mutex if
                           it is locked.

4  –  Mutex Attributes Routines

   pthread_mutexattr_gettype_np
                           Obtains the mutex type attribute of a
                           mutex attributes object.

   pthread_mutexattr_settype_np
                           Changes the mutex type attribute of a
                           mutex attributes object.

5  –  Condition Variable Routines

   pthread_cond_signal_int_np
                           Wakes one thread that is waiting on a
                           condition variable (called from interrupt
                           level only).

6  –  DECthreads Exception Object Routines

   pthread_exc_get_status_np
                           Obtains a system-defined error status
                           from a DECthreads status exception object.

   pthread_exc_matches_np  Determines whether two DECthreads exception
                           objects are identical.

   pthread_exc_report_np   Produces a message that reports what a
                           specified DECthreads status exception
                           object represents.

   pthread_exc_set_status_np
                           Imports a system-defined error status
                           into a DECthreads address exception object.