From: Adam Bukowski <bukowski.adam@...>
Date: 2011-12-05T19:23:19+09:00
Subject: C module calling ruby code cause cfp consistency error

Hi everyone,

I need some help with joining C code with Ruby.
My target is to use some system libraries to get active window title and
write rest in ruby.
I've written some module in C that uses wnck(on linux) to get window
title. There must be some event loop which I run in different thread.
When event window-changed occurs i want to call ruby method, to report
window title.
I've used some kind of observer pattern here, so ruby registers handler
method in C module, and do something else.

When there is no handler function call in C code - everything is great,
but it makes no sense.

Problem is that when I call ruby handler from different thread it causes
cfp consistency error and rest of code in ruby file isn't working
properly. It hangs waiting for window-change. When window is changed
then it goes to next instruction.

I've tried not to use native thread and call this blocking wnck's loop
in ruby's Thread.new, but it hangs totally then.

I've stuck.

Ruby code is here, rest in attachments.

Please give me support and some comments about handling cross threads
calls.

Thanks in advance,
Adam


require 'ActiveWindow'
include ActiveWindow

class TitleHandler
  def initialize
    @mutex = Mutex.new
  end
  def handle(title = '', wclass = '')
    @mutex.synchronize {
      print title + " - " + wclass + "\n"
    }
  end
end

handler = TitleHandler.new
ActiveWindow.register_handler(handler, "handle")
ActiveWindow.start_loop

puts "wait..."
sleep 1
puts "1"
sleep 1
puts "2"
sleep 1
puts "3"
ActiveWindow.stop_loop
puts "end"

Attachments:
http://www.ruby-forum.com/attachment/6812/ActiveWindow.c
http://www.ruby-forum.com/attachment/6813/extconf.rb


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