Any difference between kernel32.dll Sleep and Thread.Sleep()

Question

Is there any difference(performance, implementation. .whatever) between the following:

i)

DllImport("kernel32.dll")]
        public extern static void Sleep(uint msec);

..then call Sleep function

ii)

Thread.Sleep()

Answer 1

There's a big difference, actually.

This blog post explains why managed threads should never do unmanaged blocking, if possible. The official MSDN documentation has the same guideline without all the underlying details.

P.S. Thread.Sleep is a sign of a poorly-designed program.

Answer 2

I wouldn't think so. They both work on the current thread only.

Take care though when using the Sleep function in the main thread as programs that depend on synchronized timing usually cause problems when external configurations change.

Using Sleep in support or listening threads is usually not a problem though.