Round Robin Scheduling : Operating System -


let suppose scenario given 3 processes :- 

p1   ->          (cpu burst = 3ms , arrival time = 0ms) , p2   ->          (cpu burst = 4ms , arrival time = 0ms), ,  p3   ->          (cpu burst = 5ms , arrival time = 1.5ms)

now need schedule these processes round robin scheduling time quantum = 2ms. given i/o operation each process takes 0.5ms .

so if p1 gets blocked i/o request after 1ms , cpu start executing next process ready queue or wait till p1 returns i/o wait time quanta 2ms , can still execute 0.5ms more ?

also when p3 arrive @ 1.5ms , assuming cpu has started execution next process when p1 got blocked due i/o , after 0.5ms of i/o operation completion p1 has come ready queue .....which among p1 , p3 placed first in ready queue ?


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