From the course: Parallel and Concurrent Programming with Java 1
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Abandoned lock: Java demo - Java Tutorial
From the course: Parallel and Concurrent Programming with Java 1
Abandoned lock: Java demo
- [Instructor] To demonstrate what happens if you abandon a lock in Java, I'll be modifying a version of the previous dining philosophers example that I used to demonstrate a deadlock. It has three philosophers using chopsticks to take sushi from a shared plate. I've already fixed the deadlock in this version, so if I run this program, the philosophers successfully take turns eating sushi until all of the pieces are gone. The critical section for this program exists between the lock calls on line 23 and 23, and the calls to the unlock method on lines 32 and 33. Now, if one of the philosopher threads acquires those locks and then something goes wrong in the critical section and throws an unexpected error, that could cause its thread to terminate before it gets a chance to release those locks. To simulate that happening, I'm going to add another if statement that checks to see if there are exactly 10 pieces of sushi left. And if so, I'll use my favorite technique for intentionally…
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