windows xp scheduling algorithms

i am interested what scheduling algorithms windows xp uses,has anyono any info on this?

Do you mean proccess schedulling or Disk head scheduling ? Or ?

Hi S0lo its process scheduling im interested in and the different algorithms used to implement this for windows xp operating system..

check this document, there is a section for process scheduling:

dycsprogram.tripod.com/MacVsWinXPCS470ResearchPaper.doc

Basicaly, WinXP always poles the CPU (like round robin) between the highest priority threads that are awake. When all those threads are asleep, WinXP poles the next highest priority threads until they are all asleep and so on. It's also premptive. So, once a higher priority thread wakes up, WinXP forces the CPU to leave the lower priority thread it is executing and go to execute the higher one.