scheduling for RTOS and GENERAL OS

[vead]

scheduling is process by which operating system decide which one task will be next on processor

scheduling determine the order in which task are executed

different os kernel may use different scheduling algorithm

Q.how the scheduling for RTOS is different from scheduling for general OS ?

 

[Dan Mills]

A general purpose machine is all about maximising thruput, a RTOS is all about meeting deadlines, this impacts everything from scheduling (and its interaction with IO and VM subsytems to process migration between cores to locking strategies.

For example most RTOS do priority inheretence to ensure that a high priority task cannot be blocked for arbitary time by conteding on a lock held by a low priority process while a medium priority process hogs the CPU, this sort of thing has far reaching implications and is usually not a feature of general purpose operating systems.

Regards, Dan.

 

[vead]

scheduling algorithm



First Come First Serve (FCFS) Scheduling

Shortest-Job-First (SJF) Scheduling

Priority Scheduling

Round Robin(RR) Scheduling

Multilevel Queue Scheduling

which scheduling is used in RTOS ?
I think Priority Scheduling