From: Guillaume Gdo <guillaume.dorchies@...>
Date: 2009-05-05T21:35:45+09:00
Subject: Thread and Mutex in Ruby 1.8.7

Hello, in ruby 1.8.7

I want to do something like this:

require 'thread'
class Bar
   def initialize(f)
     @f=f
   end

   def m_a #This method isn't call only by FOO::m_b
      @f.m_a
   end
end

class Foo
 def initialize
   @mutex=Mutex.new
 end

 def m_a
   @mutex.synchronize do
     puts "A"
   end
 end

 def m_b
   @mutex.synchronize do
     puts "B"
     b=Bar.new(self)
     b.m_a
   end
 end
end

f=Foo.new
f.m_b

I must have
>A
>B

but I have
B
test.rb:8:in `synchronize': stopping only thread (ThreadError)
       note: use sleep to stop forever
       from test.rb:8:in `m_a'
       from test.rb:16:in `m_b'
       from test.rb:14:in `synchronize'
       from test.rb:14:in `m_b'
       from test.rb:22

because  I can't do

mutex=Mutex.new
mutex.synchronize do
   mutex.synchronize do
     puts "A"
     puts "B"
   end
end

Nevertheless my thread have a lock on the mutex. How to reuse it ?

Thanks
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