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beremiz

Runtime: work around 1s delay added when using twisted reactor's callLater.
wxPython4
2022-10-05, Edouard Tisserant

c3aae4c95bc1

Runtime: work around 1s delay added when using twisted reactor's callLater.

Since wxPython4, using wxReactor from non-main thread was producing
exceptions in wxWidget's C++ code. Then reactor.run() was called from
main thread, and runtime's worker was delegating calls to reactor
with callLater(0, callable).

While this worked perfectly with wxReactor, it did introduce an unexplained
1 second delay to each worker call when using nomal linux reactors
(i.e. without wxPython). As a workaround reactor runs in a thread when using
twisted without wxPython

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<fileHeader companyName="Unknown" productName="Generic PLC" productVersion="1" creationDateTime="2013-01-29T14:01:00" contentDescription="This example shows logging functionality in Beremiz.
Here are shown two ways of logging:
- from IEC PLC program;
- from python extension.
"/>

<contentHeader name="Logging example" modificationDateTime="2018-09-26T13:10:14">

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<comment localId="15" height="249" width="682">

<position x="19" y="8"/>

<content>

<xhtml:p><![CDATA[This example shows logging functionality in Beremiz.

Here are shown two ways of logging:

- from IEC PLC program;

- from python extension.

In IEC PLC program every third second (beat) new message is generated and put in PLC log.

See function blocks below.

Every 15 seconds status of PLC program is put in PLC log from python extension.

For more information about logging from python look at 0.x: py_ext_0 implementation in project tree.

]]></xhtml:p>

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