What is a deadlock in programming development

This article is about what deadlocks are in programming development. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

I. the concept of deadlock

If the synchronization of multiple threads is not designed properly, it will cause a deadlock. Deadlock refers to the situation that when multiple threads share some resources, they are waiting for each other to release the resources, thus causing the program to stagnate.

Deadlocks can cause programs to stagnate, so we must pay attention to avoid deadlocks when writing multithreaded programs. In fact, the above problem is easy to solve, as long as two threads access critical resources in the same order. Set lock timeout, which can also be used to avoid deadlock

Conditions of deadlock

Mutually exclusive condition: resources cannot be shared and can only be used by one process.

Request and retention conditions: processes that have already received resources can reapply for new resources.

Non-deprivation conditions: resources that have been allocated cannot be forcibly deprived from the corresponding process.

Loop waiting condition: several processes in the system form a loop, and each process in the loop is waiting for the resources being occupied by neighboring processes.

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