From: Grant Schoep <lists@...>
Date: 2012-06-06T06:49:50+09:00
Subject: XML::Parser, keeping file open

Using:
Ruby 1.9.2p136
libxml-ruby (1.1.4)
on RHEL 5.7

I have an application that seems to not be cleaning up xml files as I
read them. I can force it to clean up by manually running GC.start.  But
I'd like to understand how to really close this, like you can do

xyz = File.open
...
xyz.close

Using a block, or the example above, I know that file is closed... But
for xml files...

Here is a nice simple example that reproduces it for me. When I run the
below example, and execute lsof on the running process, I see there are
four instances of the xml file open. If I uncomment the "GC.start" line.
It leaves all but ONE instance open. Now, this is a simple example,
eventually the GC will clean things up. But I'd like to clean it up
myself, and not rely on the garbage collector to do it at some point.
I'd also rather not just force the garbage collector to run like I show
in my example.

Thanks

------------------------------------------------------
require 'xml/libxml'

def readIt()
  parser = XML::Parser.file("someFile.xml")
  parser = nil
end

while true
  readIt()
  readIt()
  readIt()
  readIt()

#  GC.start
  puts "Sleeping"
  sleep 100
end
------------------------------------------------------------

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