std :: this_thread :: yield()与std :: this_thread :: sleep_for() [英] std::this_thread::yield() vs std::this_thread::sleep_for()

问题描述

C ++ 11 std :: this_thread :: yield()和 std :: this_thread :: sleep_for()有什么区别?如何决定何时使用哪个?

What is the difference between C++11 std::this_thread::yield() and std::this_thread::sleep_for()? How to decide when to use which one?

推荐答案

std :: this_thread :: yield 告诉实现重新安排线程的执行，在您遇到这种情况时应使用处于繁忙的等待状态，例如在线程池中:

std::this_thread::yield tells the implementation to reschedule the execution of threads, that should be used in a case where you are in a busy waiting state, like in a thread pool:

...
while(true) {
  if(pool.try_get_work()) {
    // do work
  }
  else {
    std::this_thread::yield(); // other threads can push work to the queue now
  }
}

如果您确实要等待特定时间，可以使用

std :: this_thread :: sleep_for .这可以用于真正重要的时间任务，例如:如果您真的只想等待2秒.(请注意，实现的等待时间可能会超过给定的持续时间)

std::this_thread::sleep_for can be used if you really want to wait for a specific amount of time. This can be used for task, where timing really matters, e.g.: if you really only want to wait for 2 seconds. (Note that the implementation might wait longer than the given time duration)

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