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Inside Macintosh: Files /

Chapter 5 - Disk Initialization Manager / Disk Initialization Manager Reference

Routines / Loading and Unloading the Disk Initialization Manager

DIUnload

To free the memory space occupied by the Disk Initialization Manager, you can call the DIUnload procedure.

PROCEDURE DIUnload;

DESCRIPTION

The DIUnload procedure makes the Disk Initialization Manager and its associated dialog box and dialog items purgeable. They remain in memory until the Memory Manager purges the heap zone.

If you are using the low-level disk initialization routines and read just the package resource into memory, you can free the memory the package occupies by calling the ReleaseResource procedure.

To force the Memory Manager to purge the heap zone so that it really frees the memory occupied by the Disk Initialization Manager and its dialog box and dialog items, you
can call one of the Memory Manager routines PurgeMem and MaxMem. For more information, see the chapter "Memory Manager" in Inside Macintosh: Memory.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro and routine selector for DIUnload are

Trap macro	Selector
_Pack2	$0004

SPECIAL CONSIDERATIONS

Because DIUnload might affect memory, you should not call it at interrupt time.