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Important: The information in this document is obsolete and should not be used for new development.

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Inside Macintosh: Processes
Chapter 4 - Vertical Retrace Manager / Vertical Retrace Manager Reference
Vertical Retrace Manager Routines / Slot-Based Installation and Removal Routines


You can use the SlotVInstall function to install a task record in a slot-based vertical retrace queue.

FUNCTION SlotVInstall (vblTaskPtr: QElemPtr; theSlot: Integer):
A pointer to the task record to add to a queue.
The slot number of the video device to whose vertical retrace queue the task record is added.
The SlotVInstall function installs the task record specified by the vblTaskPtr parameter in the vertical retrace queue associated with the video device specified by the theSlot parameter. The Vertical Retrace Manager executes the task at intervals determined by the task record's vblCount and vblPhase fields. The task must reset the value of the task record's vblCount field if you want the task to be executed again.

The Vertical Retrace Manager continues to execute tasks installed using the SlotVInstall function even when the application that installed them is switched out.

The registers on entry and exit for SlotVInstall are
Registers on entry
A0Pointer to the task record
D0Slot number of the device associated with the vertical retrace queue
Registers on exit
D0Result code

noErr0No error
vTypErr-2Invalid qType value (must be ORD(vType))
slotNumErr-360Invalid slot number

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© Apple Computer, Inc.
17 JUN 1996