How can mutual deadlock (Deadlock) be detected in two threads?

Mutual blocking (Deadlock) in two threads can be detected using the following methods:

• Code analysis: check if threads acquire resources in different orders, which can lead to cyclic waiting.
• Using profiling and debugging tools: for example, in Java, you can use jstack to obtain a thread dump and see which locks are held and which are waiting.
• Logging lock acquisition and release: add logs when entering and exiting synchronized blocks or when using Lock.

Example of using jstack:

jstack <pid> > threaddump.txt

In the threaddump.txt file, you can find threads in the BLOCKED state and see which objects they are waiting for, to identify mutual blocking.