How write a synchronized class

gdo · May 7, 2009, 2:38pm

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.

Thanks
Guillaume

gdo · May 7, 2009, 4:38pm

On Thu, May 7, 2009 at 6:38 AM, Guillaume dorchies
[email protected] 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 …

gist.github.com

https://gist.github.com/TwP/108117

reentrant_mutex.rb

class ReentrantMutex < Mutex

  def initialize
    super
    @locker = nil
  end

  alias :original_synchronize :synchronize

  def synchronize

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Give it a shot and see if it fixes your deadlock issue.

Blessings,
TwP

gdo · May 7, 2009, 4:42pm

Thank you It’s exactly that I need

gdo · May 7, 2009, 5:48pm

2009/5/7 Tim P. [email protected]:

I wrote a reentrant mutex class at one point in time …

reentrant_mutex.rb · GitHub

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 `’
17:46:17 $ ruby19 -r monitor -e ‘m=Monitor.new;m.synchronize {
m.synchronize { p 1 } }’
1
17:46:23 $

Kind regards

robert