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A process is running on two kernel threads. Match each combinations of TCB/PCB states with proper choice of valid/invalid, as

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Answer #1

Table:

PCB TCB 1 TCB 2 VALID/INVALID Running Running Ready VALID Ready Ready Running VALID Blocked Ready Ready INVALID Blocked Block

Reason:

3rd Combination:

When a process i.e. PCB is blocked, no other process has access to the threads i.e. TCBs running under it. Hence if PCB is in blocked state then all the TCBs under it must also be blocked. So 3rd Combination is invalid

6th Combination:

If a thread i.e. TCB is blocked, then it blocks the parent process i.e. PCB which subsequently blocks rest of the remaining concurrent threads. Hence if TCB is in blocked state then PCB and all the concurrent threads must also be in blocked state.

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