tests/projects/svghmi_v2/py_ext_0@py_ext/pyfile.xml
author Edouard Tisserant <edouard.tisserant@gmail.com>
Wed, 05 Oct 2022 16:10:17 +0200
branchwxPython4
changeset 3617 c3aae4c95bc1
parent 3416 53c66c4aefa3
permissions -rw-r--r--
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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<?xml version='1.0' encoding='utf-8'?>
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<PyFile xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
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  <variables>
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    <variable name="SomePLCglobal" type="HMI_STRING" initial="'blaf'" onchange="MyOnChangeFunc"/>
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  </variables>
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  <globals>
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    <xhtml:p><![CDATA[
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def MyOnChangeFunc(changed_var_name):
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    print changed_var_name + ": " + getattr(PLCGlobals, changed_var_name)
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]]></xhtml:p>
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  </globals>
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  <init>
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    <xhtml:p><![CDATA[
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]]></xhtml:p>
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  </init>
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  <cleanup>
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    <xhtml:p><![CDATA[
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]]></xhtml:p>
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  </cleanup>
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  <start>
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    <xhtml:p><![CDATA[
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]]></xhtml:p>
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  </start>
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  <stop>
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    <xhtml:p><![CDATA[
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]]></xhtml:p>
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  </stop>
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</PyFile>