The difference between spin and sleep

sleep： It is realized by timer , Thread will be suspended , Give up CPU, When the time comes, the operating system will change the thread to the ready state , And join the ready queue waiting to be scheduled .

The spin ： It is generally used when robbing the lock , If you fail to grab the lock, spin a certain number of times , Spin operation will call CPU Of PAUSE Instructions .PAUSE Command to do nothing , But it will consume CPU Time , So I won't give up CPU.