Inside Macintosh: Processes

Chapter 6 - Deferred Task Manager / Deferred Task Manager Reference

Data Structure

The deferred task queue is a standard operating-system queue. The DeferredTask data type defines an element in the deferred task queue.

TYPE DeferredTask =
RECORD
   qLink:      QElemPtr;   {next queue entry}
   qType:      Integer;    {queue type}
   dtFlags:    Integer;    {reserved}
   dtAddr:     ProcPtr;    {pointer to task}
   dtParm:     LongInt;    {optional parameter passed in A1}
   dtReserved: LongInt;    {reserved; should be 0}
END;

Field Description

qLink

A pointer to the next entry in the deferred task queue, or NIL if there are no more entries in the queue. You do not need to set this field; the Deferred Task Manager does it for you.

qType

The queue type. You must set this field to ORD(dtQType).

dtFlags

Reserved.

dtAddr

A pointer to the task to be executed. Set this field to the address of the routine that you want to execute after interrupts have been enabled.

dtParm

An optional parameter that is loaded into register A1 just before the routine specified by the dtAddr field is executed.

dtReserved

Reserved. You should set this field to 0.

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© Apple Computer, Inc.
17 JUN 1996