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Sync interpreter access from another thread

From heinrichmartin@21:1/5 to All on Sun Oct 29 05:36:32 2023

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

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From Christian Werner@21:1/5 to All on Sun Oct 29 07:42:47 2023

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

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From heinrichmartin@21:1/5 to Christian Werner on Mon Oct 30 00:19:28 2023

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!

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