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Non-preemptive scheduling is the default. This causes the scheduler to be invoked only when the thread which is currently running blocks itself or explicitly yields control (tce_thrd_yield()). If a new thread is being started, the state of the "old" thread (state of registers and the stack pointer) is being preserved in the thread's descriptor. Similarly, the context of the "new" thread is being loaded from its descriptor into processor registers. This operation is called
a context switch . Every time a thread is scheduled again, it will restart its execution where it has been stopped, with identical processor state.
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