Plugin disables, "attempt to yield across metamethod/C-call boundary"

[kimaldis]

Any idea what this means: I'm calling LrSockey.bind() followed by a never-ending while loop inside a callWithContext() inside astartAsyncTask(). The error occurs, and the plugin is disabled, after it's been running for a while, usually overnight.

Plug-in error log for plug-in at: /Users/kimaldis/Documents/Dev/lightroom dev/Beetle/Beetle.lrdevplugin

**** Error 1

An error occurred while attempting to run one of the plug-in’s scripts.
attempt to yield across metamethod/C-call boundary

**** Error 2

An error occurred while attempting to start the plugin.
attempt to yield across metamethod/C-call boundary

**** Error 3

Could not add a menu item for this plug-in.
attempt to yield across metamethod/C-call boundary

[johnrellis]

Many of the API functions and methods must be called from a task started by LrTasks. If you try to call one of these (e.g. photo:getDevelopSettings() from the main task, you get that error. You'll also get that error if you call one of those functions from within pcall() rather than LrTasks.pcall().  Does your plugin use pcall()?   Maybe after running for a while, your plugin is calling one of those functions from the main task or within pcall().

Are you using my Debugging Toolkit by any chance, and if so, which version? An older version would trigger such errors.

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[kimaldis]

The LrSocket in the plugin just sits there waiting for data on a socket, does nothing until it receives something. The error is there when I open the laptop first thing in the morning. Nothing should have happened overnight, it would have been in its wait state all night.

The plugin expects Lua code on the socket which it executes in an LrTasks.pcall(), but this wouldn't have happened overnight, no sender is active during that time.

I'm not using pcall(), only LrTasks.pcall()

[kimaldis]

this error  seems to be associated with LrInitPlugin. If I start the socket listen loop using LrForceInitPlugin = true, LrInitPlugin = 'Init.lua', then it crashes out after a few hours. If the loop is started from the Plugin Extras menu, it runs, as far as I can tell, forever.