進程同步練習(P、V操作)

整形信號量爲S，所說的P、V操作wait(S)和signal(S) wait(S):{ S->value–; if(S->value < 0)block(S->list); } signal(S):{ S->value++; if(S->value <= 0)wakeup(S->list); } 執行序列： S1 C=42 S2 Y=C-Y=42-45=-3 S3 V(T) T=1 S4 C=Y-

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