void yield()Yields the current execution. Execution will be resumed the next game tick. This is the same as calling yield(1).
void yield(uint frames)Yields the current execution for a specific number of frames. Execution will be resumed after the given number of frames have passed. Do not use this function to yield for a specific time as this function is framerate dependant - use sleep() for that instead.
uint frames
The number of frames to yield for. Passing 0 here will not yield at all, and should be considered a no-op. Passing 1 is the same thing as calling yield().