Are you annoyed by pseudo-random breakage in Ignition project library scripting? Odd top-level constants being garbled, or operations in the top level that have side effects running twice? Or more? Not happening much, but always around project edits, and sometimes even on gateway restart? Yeah, m…

I should mention that the work-around shown above should NOT be placed in all of your project library scripts. It solves the multiple execution problem but at the risk of AB-BA deadlock across interdependent scripts. Some thoughts: Definitions of simple functions and simple assignments to top-l…

So the workaround does not always work? I think this is quite important to get right for Ignition.

The work-around always works if it runs to completion (the .release()). There are situations where that could be blocked or broken, most notably AB-BA deadlocks.

Looks like this is now fixed: [image] Nightly 8.1 Changelogs - 2025 Ignition Early Access Nightly Changelog: 8.1.46-SNAPSHOT-b20250203 Scripting Scripting IGN-11792: Backport script module load order initialization fix Fixed an issue with script initializati…

do you thing this bug could be rely to the script initialization race: [image] [bug-3893]Message Handler null in ScriptConfig during project save Ignition Gateway script MessageHandlerException, project 'Project6', message handler 'threadHandler': com.inductiveautomation.i…

Doesn't sound like it. This race happens when a parallel "thundering herd" of events happen right after scripting restart. The message handler bug seems to be in the middle of scripting restart, entirely in java.

[image] pturmel: Looks like this is now fixed: BTW, 8.1.46 was pulled because that fix could trigger AB-BA deadlock with jython's own module import lock in some cases. (Where users were importing other project library scripts.)

[image] pturmel: Top level constants that are assembled in multiple steps, using += or list.append() operations, will be corrupted in odd ways by the parallel execution. (Encountered this a lot some years ago--I had to stop doing that.) Top As the fix seems no to be targeted in 8.1.49 I wil…

We have put the workaround. Work nice force script update, but when we try to import a project we have a deadlock detected. Any idea what's wrong ? [image] [image]

The work-around is not a complete fix. It only catches the races in one project library script. It cannot deal with races across multiple scripts, and can deadlock in such cases. You'll have to study the thread dump to determine which of your scripts are deadlocking. (Make sure you do not use py…

[IGN-6503]Project Library Script Initialization Races

Ignition

pturmel February 4, 2025, 12:32pm 5

Looks like this is ~~now fixed~~: