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Content wikid ThE HOME OF FANDOM Games Movies TV Explore Wikia y Q Search Club Penguin Answers Wiki. TUTU B ANSWERS On the Wiki Wiki Activity Community Random page Wikianswers Videos Photos Chat Welcome to Club Penguin Answers Wiki. What would you like to know? Ask Show how to implement the wait() and signal() semaphore operations in multiprocessor environments using the TestAndSet () instruction? Edit Talk0 f (t 9,351 This wiki THIS WIKI int guard 0; int semaphore value 0; wait () while (TestAndSet(guard) 1); if (semaphore value 0) atomically add process to a queue of processes waiting for the semaphore and set guard to 0; else semaphore value--; guard 0; signal() while (TestAndSet(guard) 1); if (semaphore value 0 there is a process on the wait queue) wake up the first process in the queue of waiting processes else semaphore value guard 0; Categories: Add category

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