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Inside Macintosh: Memory /

Chapter 1 - Introduction to Memory Management / Memory Management Reference

Memory Management Routines / Setting Up the Application Heap

GetApplLimit

Use the GetApplLimit function to get the application heap limit, beyond which the application heap cannot expand.

FUNCTION GetApplLimit: Ptr;

DESCRIPTION

The GetApplLimit function returns the current application heap limit. The Memory Manager expands the application heap only up to the byte preceding this limit.

Nothing prevents the stack from growing below the application limit. If the Operating System detects that the stack has crashed into the heap, it generates a system error. To avoid this, use GetApplLimit and the SetApplLimit procedure to set the application limit low enough so that a growing stack does not encounter the heap.

Note

The GetApplLimit function does not indicate the amount of memory available to your application.

ASSEMBLY-LANGUAGE INFORMATION

The global variable ApplLimit contains the current application heap limit.