On Tuesday, 27 October 2020 at 11:36:42 UTC, Marcone wrote:
I want to use isDaemon to automatic stop worker thread if ownner thread is finished

Terminating threads without properly unwinding the stack is generally a very bad idea. Most importantly the destructors of stucts on the stack won't run which can cause problems like locks not being released.

This isn't specific to D either. For example Raymond Chen writes about the TerminateThread function in Windows here:
https://devblogs.microsoft.com/oldnewthing/20150814-00/?p=91811

You should signal the thread somehow that it's time to stop working

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