Type ASSEMBLE
Source Lines : 248
Fixes Applied : 0
Most Recent Version : Thursday, December 7, 1978
Last Fix ID : [Unmodified]
Module
DMTAKE
Function
THE DMTAKE MODULE CONTAINS THE SUPR SERVICE WHICH
SUPPLIES TASK PROGRAMS WITH THE RECEIVER INTERFACE
TO GIVE REQUESTS ISSUED BY OTHER TASKS. A SINGLE
CALL TO DMTAKE FIRST RESPONDS TO THE PREVIOUSLY
SUPPLIED GIVE REQUEST, AND THEN SUPPLIES A NEW
GIVE REQUEST TO THE TASK FOR ITS PROCESSING.
Attributes
REUSABLE, NON-INTERRUPTABLE
Operation
DMTAKE BEGINS PROCESSING BY SUSPENDING THE
CALLING TASK'S EXECUTION BY THE FREEZE SVC
FUNCTION. THE GIVE REQUEST QUEUE IS SCANNED FOR AN
ELEMENT REFLECTING A PENDING RESPONSE TO A
PREVIOUSLY RECEIVED GIVE REQUEST. IF SUCH AN
ELEMENT IS FOUND, THE RESPONSE BUFFER SUPPLIED BY
THE CALLER IS MOVED TO THE SENDER'S RESPONSE
BUFFER, AND THE SENDER'S GIVE TABLE IS POSTED WITH
THE CODE SUPPLIED BY THE RESPONDING TASK. THE GIVE
REQUEST QUEUE IS THEN SCANNED AGAIN FOR AN ELEMENT
REFLECTING A PREVIOUSLY UNACCEPTED GIVE REQUEST
ADDRESSED TO THE CALLING TASK. IF SUCH AN ELEMENT
IS FOUND, THE REQUEST BUFFER SUPPLIED BY THE TASK
ISSUING THE GIVE REQUEST IS MOVED TO THE DMTAKE
CALLER'S REQUEST BUFFER. THE RETURN CODE IS SET
ACCORDING TO THE CONDITIONS WHICH OCCURED DURING
THE DMTAKE REQUEST PROCESSING, AND CONTROL IS
RETURNED TO THE DISPATCHER.
Calls to Other Routines
DMTQRQ - TO RESERVE AND RELEASE SUP QUEUE ELEMENTS
DMTPST - TO POST RESPONSE COMPLETION