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Re: What's the deal with deadlocks

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On 04/18/11 08:35 AM, Paavo Helde wrote:
> Joe Snodgrass<joe.snod@yahoo.com>  wrote in news:23020668-d86c-489a-988b-
> 7b379f34851c@j13g2000pro.googlegroups.com:
>
>>
>> The general concept is simple enough, but it seems to me that you'll
>> need special tools to diagnose this specific problem.  How do you get
>> the debugger to look inside threads, see that they're hung, and find
>> out where the problem is happening?  Do the debuggers have some
>> features that I haven't heard of?  TIA.
>
> Debugging deadlocks is easier than e.g. race conditions, because when a
> deadlock appears the program is effectively stopped at the point of the
> error and one can easily attach the debugger and study the stack traces of
> all the threads. All the debuggers I use support this. The only problem is
> that if there are many threads running then finding the actual culprit may
> become tedious. I am not sure if this can be automated by some tools
> currently.
>
> For avoiding deadlocks in advance one can use valgrind+helgrind and fix all
> inconsistent lock order diagnostics it spits out. This way one should be
> able to get rid of all potential deadlock scenarios in all code paths
> covered by the test run.

There are also static deadlock analysis tools such as Sun Studio's LockLint.

-- 
Ian Collins

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What's the deal with deadlocks Joe Snodgrass <joe.snod@yahoo.com> - 2011-04-17 09:15 -0700
  Re: What's the deal with deadlocks markspace <-@.> - 2011-04-17 09:35 -0700
    Re: What's the deal with deadlocks Lew <noone@lewscanon.com> - 2011-04-17 13:14 -0400
  Re: What's the deal with deadlocks Patricia Shanahan <pats@acm.org> - 2011-04-17 09:45 -0700
  Re: What's the deal with deadlocks Robert Klemme <shortcutter@googlemail.com> - 2011-04-17 19:30 +0200
  Re: What's the deal with deadlocks Paavo Helde <myfirstname@osa.pri.ee> - 2011-04-17 15:35 -0500
    Re: What's the deal with deadlocks Ian Collins <ian-news@hotmail.com> - 2011-04-18 08:41 +1200
    Re: What's the deal with deadlocks Joe Snodgrass <joe.snod@yahoo.com> - 2011-04-18 11:59 -0700
      Re: What's the deal with deadlocks Lew <noone@lewscanon.com> - 2011-04-18 16:22 -0400
        Re: What's the deal with deadlocks "Alf P. Steinbach /Usenet" <alf.p.steinbach+usenet@gmail.com> - 2011-04-18 22:32 +0200
          Re: What's the deal with deadlocks Ian Collins <ian-news@hotmail.com> - 2011-04-19 09:53 +1200
            Re: What's the deal with deadlocks "Alf P. Steinbach /Usenet" <alf.p.steinbach+usenet@gmail.com> - 2011-04-19 01:21 +0200
            Re: What's the deal with deadlocks Joe Snodgrass <joe.snod@yahoo.com> - 2011-04-19 14:10 -0700
              Re: What's the deal with deadlocks Lew <noone@lewscanon.com> - 2011-04-19 23:01 -0400
                Re: What's the deal with deadlocks Joe Snodgrass <joe.snod@yahoo.com> - 2011-04-20 17:00 -0700
                Re: What's the deal with deadlocks Lew <noone@lewscanon.com> - 2011-04-21 00:29 -0400
              Re: What's the deal with deadlocks Patricia Shanahan <pats@acm.org> - 2011-04-19 21:18 -0700
        Re: What's the deal with deadlocks Tom Anderson <twic@urchin.earth.li> - 2011-04-19 00:50 +0100
  Re: What's the deal with deadlocks Roedy Green <see_website@mindprod.com.invalid> - 2011-04-17 14:01 -0700
  Re: What's the deal with deadlocks Noah Roberts <dont@email.me> - 2011-04-18 16:59 -0700

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