10/4/2023 0 Comments Deadlock definition javaNow that we have read and understood the logic, how do we attempt to solve the puzzle? Well, if you think about it, this is a classic example of a deadlock. The best way to understand it is to just read the code and trace it take a moment for the brain to stop hurting. Thus, I'm not going to attempt to describe what this code does using an even more ambiguous language (English). The way this class is written is confusing, and it's done so on purpose to mislead you and hide the offending resource lock contention code. So every synchronized function in Java is like a critical section, protected by the object instance's mutex.ĭescribe a scenario in which this code has a deadlock. Before a function with the synchronized keyword can be executed, the mutex must be acquired. The original problem added a small comment block pointing out some nuances of JVM synchronization mechanism.įor the uninitiated: Every object instance in Java has one mutex associated with it. Imagine you have a Java class, defined below, which is guaranteed to result in a deadlock in certain scenarios. Don't yell at me for writing bad code, it's meant to be bad. Additionally, this puzzle is just that it's a toy program designed to demonstrate Java synchronization methods and danger of deadlocks when synchronization is not used properly. I'll try to keep this post short but sweet.Īlso, just going to reiterate, I did not come up with this problem myself, and I would love to give credit to the author. The puzzle part is not too puzzling, but not obvious at first glance, so I thought I'd throw in my two cents and maybe show some code that could be used to prove (and I use the term lightly) the outcome. The goal is to describe a scenario in which a deadlock would occur. It centers around a simple Java class ThreadNinja which uses reckless synchronization around methods and is designed to generate a deadlock. I'm not sure of the true origin of this problem, but I was introduced to it from a friend of a friend who saw a poster somewhere around an Amazon stand at some software engineering conference. A fun Java concurrency problem has been seen around some corners of the internet.
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