Two Process Software Solution in OS Synchronization
Lock variable
Entry section
I Load Ri, m[lock]
II. Comp Ri , #0
III. JNZ to step IIV.
IVStore m[lock], #1
V. Critical section (CS)
VI. Store m[lock], #0
Analysis
Initially lock = 0
Let P1 arrives
P1 → I
P1 → II R1 0
P1 → III
Let after this P1 preempts and P2 comes
P2 → I
P2 → II R2 0
P2 → III
P2 → IV → lock = 0 1
P2 → V → P2 enters CS
Again suppose P2 gets preempted
P1 → IV → lock = 0 1 1
P1 also enters CS.
Mutual exclusion is not satisfied.
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