![]() ![]() Here, both threads, Thread 1 and Thread 2, can’t complete their execution and wait for the lock forever. In addition, Thread 2 also needs to attain the lock on Object 1 however, Thread 1 has a lock on Object 1. Deadlock may occur if one thread holding resource1 (obj 1) and waiting for resource2 (obj 1) release by thread2, at the same time thread2 is holding on. Deadlock in java is a programming situation where two or more threads are blocked forever. However, Thread 2 already attains the lock on Object 2. Thread 1, which executes method 1, wants to attain the lock on Object 2. Thread 1 has attained the lock of Object 1, and Thread 2 has attained the lock of Object 2. 2) All blocked threads would block on the same class/method (e.g. Here I have written a simple program that will cause deadlock scenario and then we will see how to analyze it. ![]() some database record lock or file system lock problem which caused other threads to wait. Deadlock is a programming situation where two or more threads are blocked forever, this situation arises with at least two threads and two or more resources. Even though Synchronization prevents issues with data inconsistency, there is a synchronization issue.Īssume there are 2 threads, ‘Thread 1’ and ‘Thread 2’. In the Past In the past blocked thread usually had this issue: 1) some obvious bottleneck: e.g. At the same time, if another thread has already received the lock, the first thread waits until thread 2 releases the lock. When a specific thread needs to execute a synchronized function, it first attempts to obtain the lock. ![]() For each object in Java, a lock will be there, and Synchronization is a technique to lock a function or block of code to ensure that only 1 thread can access that function or block of code at a time. Web development, programming languages, Software testing & others How does Deadlock work?Īs discussed, the synchronized method can lock a particular portion of the code. ![]()
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