Problem with SDL_Delay

Hello !

How is SDL Delay implemented under LINUX ?

The problem with SDL Delay under LINUX is it doesn?t wait
the given delaytime. Under Windows SDL_Delay (20)
waits exactly 20ms or a little bit more, thats okay.

Under Windows SDL_Delay (20) waits sometimes 10ms, sometimes
13ms, sometimes 19ms. But it should wait 20ms or more, but not less.

CU