# Critical Section is Locked

A critical section is a part of your application that you don’t want to be executed simultaneously by other threads. When you call “Critical Section Enter” action the call only returns if there is no other Thread inside the same critical section. After the call returns, no other thread can enter the same critical section until a call to “Critical Section Leave” action is made by the current thread.

This action is used to user knows if a critical section is locked by another thread or not without actually trying to enter the critical section.

Action available for the following operating systems:

![](https://3821468174-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LrTlA1suFa5N48x_83N%2F-MAlPVpH3WRwBy16c7JY%2F-MAlQBZuuTnc6hyzKSVQ%2Fimage.png?alt=media\&token=5c9534b7-ca05-4ac4-b408-2207cd5a5295)

### Parameters

* **Critical Section Id** *\<numeric> -* Defines the handler for critical section. There are 10 pre-defined handlers for critical sections.
* **Target** *\<unquoted string> -* Defines the variable or control that stores the result of this action.


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