Rocksolid Light - comp.lang.tcl - Sync interpreter access from another thread

Sync interpreter access from another thread

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Subject: Sync interpreter access from another thread
From: martin.heinrich@frequentis.com (heinrichmartin)
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by: heinrichmartin - Sun, 29 Oct 2023 12:36 UTC

Hi Tclers,
I want to provide a Tcl wrapper to a C API. That should be straight forward, except for the callback from another thread. Can anyone point me to how to make the callback available as a Tcl event, e.g. write a variable in a thread safe way to trigger vwait?
If possible, I want to avoid Tcl threads and busy waiting.
TIA
Martin

Re: Sync interpreter access from another thread

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Subject: Re: Sync interpreter access from another thread
From: undroidwish@gmail.com (Christian Werner)
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by: Christian Werner - Sun, 29 Oct 2023 14:42 UTC

Re: Sync interpreter access from another thread

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Subject: Re: Sync interpreter access from another thread
From: martin.heinrich@frequentis.com (heinrichmartin)
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by: heinrichmartin - Mon, 30 Oct 2023 07:19 UTC

On Sunday, October 29, 2023 at 3:42:50 PM UTC+1, Christian Werner wrote:
> Martin,
>
> there are some C coded extensions in the www.androwish.org repository which use Tcl_ThreadQueueEvent() for triggering events in a Tcl thread from another thread, see e.g.
>
> https://www.androwish.org/home/file?name=jni/ZBar/tcl/tclzbar.c&ci=tip
> https://www.androwish.org/home/file?name=jni/tcluvc/tcluvc.c&ci=tip
> https://www.androwish.org/home/file?name=undroid/tclwmf/tclwmf.c&ci=tip
>
> HTH,
> Christian

This looks exactly like my missing link. Thanks for the reference and the example!

To err is human, to moo bovine.

devel / comp.lang.tcl / Sync interpreter access from another thread

Subject	Author
Sync interpreter access from another thread	heinrichmartin
Sync interpreter access from another thread	Christian Werner
Sync interpreter access from another thread	heinrichmartin