假设我们用血肿来提供相互排斥,而一个过程正在关键部分实施。 然后又一个过程开始使用关键区域,它会被排到等候队列中吗?
我怀疑哪个过程会把这个过程排在等候队列里?
提前感谢大家,
在一个典型的操作系统中,它由内核而不是过程来操作。内核可以跟踪关键区域的存在和占用这些区域的过程。在典型的操作系统中,调度器也是内核的一部分,因此排程器可以将过程置于等待状态(或者更精确地说,是阻塞状态 ) 。
当线索/进程/ task 请求相互排斥对象时, 它会将 < em> 系统调用 < / em > 到处理相互排斥对象的内核。 如果此对象目前不可用, 那么内核会将此线/ 进程/ task 放在等待/ 堵塞的队列中, 并选择另一个 。
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