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Figure 12-1. The philosophers are getting ready to dine. The algorithm used by the philosophers for eating is divided into five steps: 1. Acquire the left chopstick. 2. Acquire the right chopstick. 3. Eat. 4. Release the right chopstick. 5. Release the left chopstick. Because all philosophers are equally hungry, they all start at once by picking up the left chopstick. The problem is that one philosopher s left chopstick is the right chopstick for another. So they all block when they try to acquire the right chopstick. A deadlock occurs, and they all starve to death. As you can see, deadlocks are dangerous, even potentially fatal. So, how are they avoided The first task is to identify potentially dangerous situations in which deadlocks can occur. Look for threads competing for more than one resource that also acquire these resources at different times. If each philosopher were to try to acquire both chopsticks in one operation, the problem would never occur. When a potentially dangerous situation is found, it must be defused. By not blindly acquiring the second chopstick, but instead trying to acquire it, a block can be avoided. If the second chopstick can t be acquired, it is important to release the first stick, too, to avoid java qr code reader download zxing/zxing: ZXing ("Zebra Crossing") barcode scanning ... - GitHub
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