Are Thread.sleep(0) and Thread.yield() statements equivalent?

Question

Are these two statement equivalent?

Thread.sleep(0);
Thread.yield();

Answer 1

This really depends on the platform and version of the JVM. For example, under Windows in JDK 5 (Hotspot), yield() is literally implemented as Sleep(0)-- although a sleep of 0 is treated slightly specially by Windows as I recall. But in JDK 6, yield() is implemented as SwitchToThread().

I put together some information a while ago on Thread.yield(), including some implementational details that may be of interest. (You might also want to see the stuff on Thread.sleep() I put together on the same site.)