sleep busy waiting
Thisputsathreadtosleepforaspecifiedtime,duringwhichthethreadwillwastenoCPUtime.Iftheloopischeckingsomethingsimplethenitwillspend ...,2021年7月15日—Non-busywaiting一樣會用到semaphore,除了原有的counter,還多了一個waitingqueue,將所有等待執行的程式...
三言两语聊Kernel:Busy Waiting or Sleeping?
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这样做的好处是,它的实现较简单,并且如果不等太久它在性能上会表现很好,因为避免了切换到其他线程的开销。坏处也很明显:把CPUcycle浪费在执行无任何价值的东西上。
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