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Kapittel 10 · Semaforer, klassiske synkroniseringsproblemer og deadlocksemaphores

Semaphores: A Counter Threads Wait On

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Semaphores — a single integer plus a queue: P() decrements and blocks if the value would go negative, V() increments and wakes a waiter; a semaphore with initial value 1 acts as a lock

semaphoreP and Vmutexcounting semaphorewait queuemutual exclusion
ForutsetterRace Condition: When Two Threads Share a Counter
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