explian scheduling polocies  of windows , linux or other operating systems

Linux process has two kinds of priority, one is the ordinary process priority, the second is real-time priority. The former applies SCHED_NORMAL scheduling strategy, and the latter can use SCHED_FIFO or SCHED_RR scheduling strategy. At any time, real-time process priority is higher than ordinary process priority, real-time process can only be preempted by the real-time process with the higher