[英]std::this_thread::yield() vs std::this_thread::sleep_for()
What is the difference between C++11 std::this_thread::yield()
and std::this_thread::sleep_for()
? C++11 std::this_thread::yield()
和std::this_thread::sleep_for()
什么std::this_thread::sleep_for()
? How to decide when to use which one?如何决定何时使用哪一个?
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: std::this_thread::yield
告诉实现重新安排线程的执行,这应该在您处于忙碌等待状态的情况下使用,例如在线程池中:
...
while(true) {
if(pool.try_get_work()) {
// do work
}
else {
std::this_thread::yield(); // other threads can push work to the queue now
}
}
std::this_thread::sleep_for
can be used if you really want to wait for a specific amount of time.如果您真的想等待特定的时间,则可以使用std::this_thread::sleep_for
。 This can be used for task, where timing really matters, eg: if you really only want to wait for 2 seconds.这可用于时间非常重要的任务,例如:如果您真的只想等待 2 秒。 (Note that the implementation might wait longer than the given time duration) (请注意,实现可能等待比给定的持续时间更长的时间)
std::this_thread::sleep_for() std::this_thread::sleep_for()
will make your thread sleep for a given time (the thread is stopped for a given time).将使您的线程在给定的时间内休眠(线程在给定的时间内停止)。 ( http://en.cppreference.com/w/cpp/thread/sleep_for ) ( http://en.cppreference.com/w/cpp/thread/sleep_for )
std::this_thread::yield() std::this_thread::yield()
will stop the execution of the current thread and give priority to other process/threads (if there are other process/threads waiting in the queue).将停止当前线程的执行并优先执行其他进程/线程(如果队列中还有其他进程/线程在等待)。 The execution of the thread is not stopped.线程的执行不会停止。 (it just release the CPU). (它只是释放CPU)。 ( http://en.cppreference.com/w/cpp/thread/yield ) ( http://en.cppreference.com/w/cpp/thread/yield )
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