From: Lars Christensen <redmine@...>
Date: 2011-02-17T17:45:15+09:00
Subject: [ruby-core:35280] [Ruby 1.9-Bug#4405][Open] WIN32OLE & Threads incompatible


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Bug #4405: WIN32OLE & Threads incompatible
http://redmine.ruby-lang.org/issues/show/4405

Author: Lars Christensen
Status: Open, Priority: Normal
Category: ext
ruby -v: ruby 1.9.2p136 (2010-12-25) [i386-mingw32]

The WIN32OLE library does not work when using Ruby threads. It may raise =
exceptions such as this:

(druby://localhost:2002) threadsys.rb:7:in `connect': failed to parse dis=
play name of moniker `winmgmts://localhost/root/cimv2' (WIN32OLERuntimeEr=
ror)

WIN32 OLE api's are not generally Thread safe, and it can be argued that =
it is the user's task to ensure that it is accessed only from one thread,=
 or the main thread. However, there are some complications;

- Using WIN32OLE from DRb (DRb can not be used without Threads).
- Using WIN32OLE indirectly (e.g. through Sys::ProcTable).

My specific case was a DRb server that examined processes using Sys::Proc=
Table, which happen to use WIN32OLE.  This causes an exception. Attached =
is a simple script that recreates the problem. Note that in this simple c=
ase, WIN32OLE is only invokes once, and only from one single thread (and =
it still throws the exception).


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http://redmine.ruby-lang.org

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