From: Robert Klemme <shortcutter@...>
Date: 2010-09-30T15:10:34+09:00
Subject: Re: Calling a method in the context of a specific thread

On 09/29/2010 03:22 AM, Ralph Shnelvar wrote:
> [Note:  parts of this message were removed to make it a legal post.]
>
> Background:
>
> I am writing an FXRuby program.  My question should be independent of FXRuby, though.
>
> FXRuby is a GUI for Ruby.
>
> If I understand some of the comments made here (and I probably don't) [see subject: interpreter cannot enter in the context from another thread] it is a bad thing to attempt to run an FXRuby function in a non-main thread.
>
>
>
>
> So ... I have a non-main thread that wants to display a message box (i.e. "call" FXMessageBox").
>
> How can I invoke FXMessageBox in the context of the main thread?
>
>
>
> I can think of all sorts of ugly solutions.
>
> For instance:
>
> 1) Set some global_variable indicating the task I want to perform in the main thread.
> 2) Do a thread.stop
> 3) have a timer in the main thread and have it dispatch based on global_variable
> 4) save the return code of FXMessageBox in a thread local variable the not-main-thread
> 5) Do a thread.run to wake up the stopped not-main-thread.

6) Have a task queue which is read in the main thread.  You can even 
store lambdas in there.

Cheers

	robert