![]() The software development kit for creating applications that use the Thread Manager. This section provides links to web pages providing information about how to use the Thread Manager: The Thread Manager provides co-operative multitasking services allowing you to create a number of smaller tasks inside of an application. Programming tips, code snippets, & FAQs by Apple's support engineersĪ listing of available Software Development Kits Late-breaking docs for timely technology issues Source for complete developer documentation Learn more about Apple products for helping you develop excellent Mac OS software For general Mac OS resources, please see the Mac OS page. New features in version 2.1 include support for kernel notifications and gestalt selectors to determine the presence of preemptive task-safe system software functions.Ĭlick here for Multiprocessing sample codeĪpple tools, sample code, and documentation to help you with your multitasking projects. It contains conceptual information, programming examples, and a complete API reference. This document describes the Multiprocessing Services application programming interface through Multiprocessing Services 2.1. ![]() "Adding Multitasking Capability to Applications Using Multiprocessing Services" The SDK includes complete documentation for the Multiprocessing API. The software development kit for creating applications that use the Multiprocessing API. Technotes describing some more obscure issues related to the Multiprocessing API. Technote 1071, "Working with Apple's Multiprocessing API" This section provides links to web pages providing information about how to use the Multiprocessing API: The Multiprocessing API provides symmetrical real-time multitasking services that you can use to create tasks inside of your applications. The APIs for preemptively tasks allow applications to create symmetrically scheduled preemptive tasks that can be run on a single processor machine, and will take full advantage of multiple processors when they are installed. For more information take a look at:Īpple's multiprocessing APIs provide support for both co-operatively scheduled tasks and preemptively scheduled tasks. It is up to 3rd party developers to thread their applications to take advantage of multiple processors. Where Mac OS X or Windows NT works well is if you have multiple applications running andĭoing something other than waiting for input. Task, the second processor will not be utilized. Note that even on Mac OS X or Windows NT, if you run one dominant application and that app is not threaded, meaning it runs in one We did this by runnning all of them in one task (the blue task), The only limitation WRT multitasking on Mac OS 9 is we needed to maintain high fidelity compatibility with existing applications andĮxtensions which were not written to be reentrant nor preemption safe. Today's MP library, which in Mac OS 9 is entirely integrated into the system, is mostly an API shim atop the multitasking ![]() What you probably do not know is as of Mac OS 8.6, the old MP library was tossed to implement multitasking directly in the Mac OS Hypothetical, it is measured real world multitasking activity. If applications take advantage of threading themselves using the MP API, they can see 1.7 - 2.2x speed up on a 2P system. Both processors are equal citizens to the kernel's scheduler. I designed the nanokernel for Mac OS 9, and it is a true multitasking and symmetric multiprocessing system.Īll tasks are scheduled to run on any processor at any time. : cpu even when the apps are multicpu aware. ![]() : older OS's prior to OS 8.still lacks the capability to fully utilize a 2nd : what I have read so far.that the system, while slightly better than > Your assesement of OS 9 seems on par with what I've read. 'From the 'guy' or 'gal' that wrote the OS 9 kernal. So I was rummaging through some old threads on the DUC and came across this response in a 'G4 Multiprocessor' thread and thought it was interesting.
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