Mac OS 8.5 Technote: Part XLIV Copyright 1998 by Apple Computer, Inc. All Rights Reserved. [Previous section] [Mac OS 8.5 Contents Page] [Next section]

Inside the System File (Continued) Virtual Memory Manager The Virtual Memory Manager provides virtual memory services for the Mac OS. The following changes have been made in the Virtual Memory Manager: All code needed to run VM on 68040 processors has been removed. GetPageState now correctly returns the state of pages in file-mapped space. Before Mac OS 8.5, GetPageState returned kPageOnDisk for unmapped pages. With Mac OS 8.5, GetPageState returns kNotPaged for unmapped pages (as it does for all other memory not controlled by the Virtual Memory). DeferUserFn previously returned a garbage result if the user function was called immediately. It now returns noErr. Related Materials: The DriverServicesLib and Memory Manager sections. Technote TN1094, "Virtual Memory Application Compatibility" Technote TN1104, "Interrupt Safe Routines" Technote IM_ERRATA 02, "Inside Macintosh -- Memory Errata" Q&A DV32, "PrepareMemoryForIO and Execution Levels" The Memory Technote Collection The Memory Q&A Collection The Virtual Memory Manager chapter of Inside Macintosh: Memory Minow, M. The New Device Drivers: Memory Matters. Develop 24

[Previous section] [Mac OS 8.5 Contents Page] [Next section] To contact us, please use the Contact Us page.