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This article introduces the relevant knowledge of "how to avoid and solve Java multithreaded deadlocks". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Here is an example of a multithreaded deadlock

Output

Thread1 get lock1thread2 get lock2

Two threads get lock 1 and lock 2 from each other, and then thread 1 waits for thread 2 to release lock 2, thread 2 waits for thread 1 to release lock 1, each of which is not mutually exclusive, thus forming a deadlock.

So how to avoid and solve the deadlock problem?

1. Add locks sequentially

In the previous example, the locking order between threads is inconsistent, resulting in a deadlock. If each thread is in the same locking order, there will be no deadlock.

2. Acquire lock time limit

Each time you acquire a lock, add a time limit, and if it exceeds a certain time, you will abandon the acquisition of the lock and so on.

3. Deadlock detection

Detect whether deadlocks occur between threads according to the relationship of acquiring locks between threads, and execute certain policies if deadlocks occur, such as terminating threads or rollback operations.

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