[Win32utils-devel] Win32-Service and threading

Daniel Berger djberg96 at gmail.com
Sun Nov 25 09:48:53 EST 2007


On Jun 18, 2006 10:18 AM, Patrick Hurley <phurley at gmail.com> wrote:
> First off I just want to pass on a big thank you to everyone who has
> worked on the win32 packages, they have helped me numerous times. But
> (of course you knew it had
> to be coming :-)...
>
> I have just started doing some work with win32-service -- I was
> creating a wrapper around it and daemon.rb, so I could write one body
> of code that depending upon platform would provide a reasonable
> interface for both windows and Unix platforms. During my testing I
> noticed some odd behavior in my test program. Having written a couple
> win32 services before I suspected some threading issues, so I did some
> digging first just in Ruby using DL, I created a call to
> GetCurrentThreadID and in logging I displayed the Current TID -- and
> we are switching system threads in the ruby interpreter.
>
> Looking at service.c, I see you are using RegisterServiceCtrlHandler,
> there is no guarantee that it will be called from the main thread
> (matter of fact it generally won't). In Service_Ctrl, you make an
> rb_funcall using the call back hash, which then calls back into the
> interpreter while the main thread is still running under mainloop.
>
> My side effect was some scrambled ruby file handles and some pipe
> closed on stopping errors. I would be happy to give back and fix this
> issue, but wanted your input on how to proceed.
>
> I have written a few extensions (primarily wrapping in house C/C++
> libraries), but have never used ruby threads explicitly in an
> extension previously. What I am considering is to create a ruby thread
> and have it politely wait for messages in a queue. In Service_Ctrl,
> just place entries in the queue. When a message arrives in the queue
> have it make the call back (from the Ruby "green" thread).
>
> If you think I am off my rocker and completely misunderstand the
> problem, sorry for wasting your time :-); however, if you think I
> understand the issue and would like me to take a stab at a patch,
> please let me know if my approach sounds reasonable.

I guess we need to revisit this now that 0.6.0 is out. Note that I
plan on rewriting the Daemon class in pure Ruby, too, now that we have
callback support.

Thoughts anyone?

Regards,

Dan


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