是什么让线程的执行顺序变得不可预测？

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是什么让线程的执行顺序变得不可预测？调度程序在某些时候是使用随机数或检查系统资源还是看哪个线程等待了足够长的时间或者......？

What makes the execution order of threads unpredictable? Does the scheduler at some point use random numbers or check system resources or see which thread has waited long enough or ...?

推荐答案

调度程序通常是OS的调度程序。它受到许多因素的影响，包括机器上的其他进程正在做什么，硬件正在做什么（中断）等。根据操作系统的不同，我认为有时可能会涉及随机数，但我怀疑通常不会。更多只是多变量时间间隔可以重叠的不可预测的方式。

The scheduler is, usually, the OS's scheduler. It is influenced by many factors, including what other processes on the machine are doing, what the hardware is doing (interrupts), etc. Depending on the OS, I suppose there may sometimes be random numbers involved, but I suspect generally not. It's more just the unpredictable way that multiple variable time intervals can overlap.