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Wire Graph thread blocked [message #1810254]

Tue, 06 August 2019 07:40

Pedro de Arquer

Messages: 34
Registered: December 2018

Member

Hi,

I'm experimenting issues with the wire graph because the a thread (stimulated by a timer) is getting blocked and, what really worries me, blocks another threads.

I experienced the issue at a bug I introduced accidentally in a given component which locked down waiting for a response. Until there, it works as expected (wrong, but as expected). However, another component has configured a scheduleAtFixedRate task to verify some conditions, but once the main thread was locked, the scheduled tasks don't emerge anymore.

Is this reasonable? How could I make that execution independent? Other processes of Kura keep running as expected (such as clock synchronization or DataService housekeeper).

Thank you in advance,

Pedro

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Re: Wire Graph thread blocked [message #1810255 is a reply to message #1810254]

Tue, 06 August 2019 07:42

Matteo Maiero

Messages: 391
Registered: July 2015
Location: Italy

Senior Member

Hi,
have a look here: http://eclipse.github.io/kura/wires/kura-wires-fifo.html

Best regards

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Re: Wire Graph thread blocked [message #1810257 is a reply to message #1810255]

Tue, 06 August 2019 07:52

Pedro de Arquer

Messages: 34
Registered: December 2018

Member

Ok, so you suggest to create a solution similar to Fifo with an independent Thread subclass?
Why is SchedulerService not good enough? I though it actually created an independent Thread out of input runnable.

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Re: Wire Graph thread blocked [message #1810258 is a reply to message #1810257]

Tue, 06 August 2019 08:00

Matteo Maiero

Messages: 391
Registered: July 2015
Location: Italy

Senior Member

In wires, the thread created by the timer is used through all the flow. If something in this flow is blocking, then th thread is itself blocked.
Having the fifo component allows you to decouple parts of the graph.

Best regards

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