From: Dave Thomas <dave@...>
Date: 2006-01-17T11:02:27+09:00
Subject: Re: There's a deadlock in code in the PickAxe, and I'm not seeing why:


On Jan 16, 2006, at 4:41 PM, ara.t.howard@noaa.gov wrote:

>
>> The following code (form pg. 739) deadlocks with a large count.  
>> What am I missing?
>
> works for me on mac and linux.  what are you on?

OSX/ruby 1.8.2 (2004-12-30) [powerpc-darwin8.2.0]

dave[CVS/rubybook 19:52:46] ruby t.rb
deadlock 0x3a4e40: sleep:J(0x3b090c)  - /Users/dave/ruby1.8/lib/ruby/ 
1.8/thwait.rb:121
deadlock 0x3b090c: sleep:-  - /Users/dave/ruby1.8/lib/ruby/1.8/ 
sync.rb:150
...
deadlock 0x1b4af4: sleep:-  - /Users/dave/ruby1.8/lib/ruby/1.8/ 
sync.rb:150
deadlock 0x1d5790: sleep:- (main) - /Users/dave/ruby1.8/lib/ruby/1.8/ 
thread.rb:281
/Users/dave/ruby1.8/lib/ruby/1.8/thwait.rb:119:in `pop': Thread 
(0x3ca744): deadlock (fatal)
         from /Users/dave/ruby1.8/lib/ruby/1.8/thwait.rb:139:in  
`next_wait'
         from /Users/dave/ruby1.8/lib/ruby/1.8/thwait.rb:154:in  
`all_waits'
         from t.rb:35


It doesn't always do it, but with 100,000 iterations, it does it most  
of the time.

Interestingly, it doesn't seem to do it with the precompiled Ruby.  
I'm wondering if I build my local version with the wrong threading  
options: the Apple build has --enable-pthread, and mine doesn't

Anyone know if that would cause a problem?


Dave