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?
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
}
}
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, eg: if you really only want to wait for 2 seconds. (Note that the implementation might wait longer than the given time duration)
std::this_thread::sleep_for()
will make your thread sleep for a given time (the thread is stopped for a given time). ( http://en.cppreference.com/w/cpp/thread/sleep_for )
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). The execution of the thread is not stopped. (it just release the CPU). ( http://en.cppreference.com/w/cpp/thread/yield )
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