why shouldn't use Critical Section to ensure single instance of my application running at a time?

[John paul coder]

Hello All,

To create a single instance of my desktop windows application (windows security application), I am using Mutex. Using CreateMutex, getting the handle of the mutex object. If the handle is NULL, returning from the application.

Below is the code snippet:

//Single instance
HANDLE hMutex = CreateMutex(NULL, FALSE, TEXT("SecurityJob"));
DWORD dwerror_code = GetLastError();
if (NULL == hMutex || ERROR_ALREADY_EXISTS == dwerror_code)
{
return 0;
}

Here, why I shouldn't use Critical Section or other synchronization technique?

Is it because each instance of the application will be treated as one process?

What will happen if i use Critical Section?

Regards,

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