一个进程内的所有线程使用同一个32位地址空间,而这些线程的执行由系统调度程序控制,调度程序决定哪个线程可执行和什么时候执行线程。线程有优先级别,优先权较低的线程必须等到优先权较高的线程执行完任务后再执行。在多处理器的机器上,调度程序可以把多个线程放到不同的处理器上运行,这样可以使处理器的任务平衡,也提高系统的运行效率。
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