Type ASSEMBLE
Source Lines : 118
Fixes Applied : 0
Most Recent Version : Thursday, December 7, 1978
Last Fix ID : [Unmodified]

Module

       DMTPST

Function

        THE DMTPST MODULE IS A  SERVICE ROUTINE WHICH MAY
        BE CALLED FROM ANYWHERE IN THE RSS SYSTEM. DMTPST
        IS USED  TO SIGNAL THE  COMPLETION OF AN  EVENT BY
        MEANS  OF  POSTING THE  EVENT'S  ASSOCIATED  SYNCH
        LOCK. DMTPST IS ENTIRELY  REENTRANT, USES NO MAIN
        STORAGE (EXCEPT THE SYNCH  LOCK WHICH IS SPECIFIED
        TO  BE  POSTED),  AND  MAY  BE  ENTERED  WITH  PSW
        INTERRUPT MASKS ON OR OFF. DMTPST DOES NOT CHANGE
        THE STATE OF THE RUNNING PSW IN ANY WAY.

Attributes

       REENTRANT

Operation

       DMTPST  POSTS THE SYNCH LOCK SPECIFIED IN THE CALL
       BY PLACING THE SPECIFIED ONE-BYTE CODE IN THE HIGH
       ORDER BYTE OF THE SYNCH LOCK (AND FORCING THE HIGH
       ORDER  BIT  OF THE  SYNCH  LOCK  TO ONE).  IF  THE
       SPECIFIED SYNCH LOCK HAS BEEN WAITED ON (IF A TASK
       ELEMENT ADDRESS HAS  BEEN SET IN THE  SYNCH LOCK),
       THE WAITING TASK'S TASK  ELEMENT ADDRESS IS LOADED
       FROM THE SYNCH  LOCK AND THE "WAITING"  BIT IN THE
       TASK TABLE  IS SET TO  ZERO. (THIS MAKES  THE TASK
       DISPATCHABLE.) THE  LOW ORDER  THREE BYTES  OF THE
       SYNCH  LOCK  ARE  SET  TO  ZERO,  AND  CONTROL  IS
       RETURNED  DIRECTLY TO  THE CALLER  BY  MEANS OF  A
       BRANCH (CONTROL IS NOT PASSED TO THE DISPATCHER).

Calls to Other Routines

       NONE