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Home » U++ Library support » U++ MT-multithreading and servers » ASyncWork/CoWork Cancel() method leads to deadlock (when used with GuiLock)

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Re: ASyncWork/CoWork Cancel() method leads to deadlock (when used with GuiLock) [message #50205 is a reply to message #50203]

Mon, 27 August 2018 09:47

mirek
Messages: 14285
Registered: November 2005

Ultimate Member

I believe the issue is caused by the fact that "Cancel" waits for the job to actually exit.

Now AsyncTest::Stop is GUI event, so when it performs, GuiLock is locked. Cancel has to wait for CoWork to finish - that is important, because often CoWork jobs are referencing local data. Then in your worker job, you attempt to GuiLock too. Obviously, after that Sleep, it is unable to lock GuiLock and result is deadlock.

Now what to do with that, I am not sure... Perhaps we need another form of 'Cancel' (something like 'Abandon') that is not required to wait for job to finish?

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[Message index]

		ASyncWork/CoWork Cancel() method leads to deadlock (when used with GuiLock) By: Oblivion on Sun, 26 August 2018 20:16
		Re: ASyncWork/CoWork Cancel() method leads to deadlock (when used with GuiLock) By: mirek on Mon, 27 August 2018 09:47
		Re: ASyncWork/CoWork Cancel() method leads to deadlock (when used with GuiLock) By: mirek on Mon, 27 August 2018 09:55
		Re: ASyncWork/CoWork Cancel() method leads to deadlock (when used with GuiLock) By: mirek on Mon, 27 August 2018 10:00
		Re: ASyncWork/CoWork Cancel() method leads to deadlock (when used with GuiLock) By: Oblivion on Mon, 27 August 2018 11:45
		Re: ASyncWork/CoWork Cancel() method leads to deadlock (when used with GuiLock) By: Klugier on Mon, 27 August 2018 17:24
		Re: ASyncWork/CoWork Cancel() method leads to deadlock (when used with GuiLock) By: mirek on Mon, 27 August 2018 17:52
		Re: ASyncWork/CoWork Cancel() method leads to deadlock (when used with GuiLock) By: mdelfede on Tue, 28 August 2018 17:25
		Re: ASyncWork/CoWork Cancel() method leads to deadlock (when used with GuiLock) By: bozero on Thu, 14 May 2020 04:25

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