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Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- UGC NET
- Computer Science & Applications
Identify the circumstances under which pre-emptive CPU scheduling is used :
(a) A process switches from Running state to Ready state
(b) A process switches from Waiting state to Ready state
(c) A process completes its execution
(d) A process switches from Ready to Waiting state
Choose the correct option :
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Eduncle Best Answer
According to Standard book of Galvin,
CPU scheduling decisions take place under one of four conditions :
1. When a process switches from the running state to the waiting state, such as for an I/O request or invocation of the wait( ) system call.
2. When a process switches from the running state to the ready state, for example in response to an interrupt.
3. When a process switches from the waiting state to the ready state, say at completion of I/O or a return from wait( ).
4. When a process terminates.
For conditions 1 and 4 there is no choice – A new process must be selected.
For conditions 2 and 3 there is a choice – To either continue running the current process, or select a different one.