Shrinkable Dynamic Areas (changes)

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Programmer's OS_DynamicArea Reference Manuals

» Shrinkable Dynamic AreasPart 15 – SWI Calls

Notes

Shrinkable areas are created using OS_DynamicArea 0 with bit 9 of R4 set. They may be shrunk by the kernel when free memory is about to be exhausted.

Shrinkable areas must have a handler routine. A new handler reason code is used for Shrinkable areas: TestShrink.

Shrinkable areas should be used sparingly due to the load on the kernel whenever free memory must be calculated (e.g. for every Wimp_SlotSize call).

See also

• Dynamic Area TestShrink
• OS_DynamicArea
• OS_DynamicArea 0
• Wimp_SlotSize