Cooperative multitasking A MULTITASKING scheme under which each concurrently running program must at intervals voluntarily relinquish control of the CPU to the next program. Such programs must be specially written to suspend themselves in some non critical section and so, conversely, programs that are not so written cannot be multi-tasked. This contrasts with PREEMPTIVE MULTITASKING in which the OPERATING SYSTEM itself periodically suspends each task, so that any program may be multi-tasked. Apple’s MACOS is a cooperative multitasking system, whereas UNIX and WINDOWS are preemptive.
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