From: Robert Klemme <shortcutter@...>
Date: 2009-05-08T00:47:27+09:00
Subject: Re: How write a synchronized class

2009/5/7 Tim Pease <tim.pease@gmail.com>:
> On Thu, May 7, 2009 at 6:38 AM, Guillaume dorchies
> <guillaume.dorchies@gmail.com> wrote:
>> Hello
>>
>> How do to write a synchronized class like in java for Ruby
>>
>> I try with a Mutex but if a method call another method of the same
>> instance I obtain a Deadlock.
>>
>>
>
> I wrote a reentrant mutex class at one point in time ...
>
> http://gist.github.com/108117
>
> Give it a shot and see if it fixes your deadlock issue.

Sorry, but you could have saved yourself the effort because it's part
of the standard library:

17:45:59 $ ruby19 -r monitor -e 'm=Monitor.new;m.synchronize {
m.synchronize { p 1 } }'
1
17:46:05 $ ruby19 -r thread -e 'm=Mutex.new;m.synchronize {
m.synchronize { p 1 } }'
<internal:prelude>:6:in `lock': deadlock; recursive locking (ThreadError)
        from <internal:prelude>:6:in `synchronize'
        from -e:1:in `block in <main>'
        from <internal:prelude>:8:in `synchronize'
        from -e:1:in `<main>'
17:46:17 $ ruby19 -r monitor -e 'm=Monitor.new;m.synchronize {
m.synchronize { p 1 } }'
1
17:46:23 $

Kind regards

robert

-- 
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