Xojo.Threading.CriticalSection.TryEnter
From Xojo Documentation
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Method
ParXojo.Threading.CriticalSectionent.TryEnter() As Boolean
Supported for all project types and targets.
Supported for all project types and targets.
Attempts to get a lock on the resource managed by the CriticalSection without blocking the app.
Notes
TryEnter is similar to Enter but returns a Boolean. If it succeeds, it returns True and the thread has exclusive use of the resource. If it fails, it returns False but does not block execution of the thread.