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In its simplest form, deadlock occurs when each of two (minimun two) threads try to acquire a lock on a resource already locked by another.
Take example of two threads
And two resources
Thread 1 locked on Resources 1 and tries to acquire a lock on Reosurce 2.
At the same time, Thread 2 has a lock on Resource 2 and it tries to acquire lock on Resource 1.
Two threads never give up their locks, hence a DEADLOCK occures.
The simplest way to avoid deadlock is to use a timeout value .
You can use the Monitor class (system.Threading.Monitor) to set a timeout during acquiring a lock.
Ex. in C#
Here the timeout is 500 milliseconds .
If the lock can't be acquired, after 500 miliseconds, timeout occurs and the code exit the Monitor block.