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Compatibility with Older System Software

Multiprocessing Services 2.0 was introduced with Mac OS 8.6. Unlike earlier versions of Multiprocessing Services, you can create and execute preemptive tasks with virtual memory turned on. Multiprocessing Services 2.0 runs on all Power Macintosh computers except for 6100/7100/8100 and 5200/6200 series computers.

Multiprocessing Services 1.0 functions can run on System 7.5.2 and later if the Multiprocessing Services 1.x shared library is available. Pre-2.0 versions of the library were installed as part of system software for Mac OS 8 through Mac OS 8.5 but must be explicitly installed for earlier releases. The 1.x versions of the Multiprocessing Services library can run on all PowerPC Macintosh computers.

For a listing of functions introduced with versions 1.0, 2.0, and 2.1 of Multiprocessing Services, see “Preemptive Task–Safe Mac OS System Software Functions.”

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