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