Apologies for the confusion.

1. FCFS = first come first serve

2. Re-framing the example

Critical section = CS lets say the CS is writing time-stamp (of when crit.pl is called) to file.

Example:
Call1 to crit.pl - running CS
Call2 to crit.pl - waiting for lock on CS
Call3 to crit.pl - waiting for lock on CS

[download]

Time wise events

T1: Call1 locks CS, Call2 waits for the lock on CS

T2: Call1 still has lock on CS, Call2 waits + new Call3 arrives and also waits

T3: Call1 completes, Call2 acquires lock on CS, Call3 waits

T4: Call2 completes, Call3 acquires lock on CS

The CS time stamps should be ascending order

Hope this makes it clearer. Please let know if this can be achieved. Thank you

In reply to Re^4: Critical section FCFS by Anonymous Monk
in thread Critical section FCFS by aj7700

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