Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.programmer > #3091

Re: What's the deal with deadlocks

Cross-posted to 2 groups.

Show all headers | View raw

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.

hth
Paavo

Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

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

csiph-web