Subj : Re: why my threads do not wake up
To   : comp.programming.threads
From : David Schwartz
Date : Tue Aug 23 2005 06:45 pm


"Jingbo" <jingbo@cadence.com> wrote in message 
news:1124841839.830586.66060@g44g2000cwa.googlegroups.com...

>I think it is Solaris problem.

    I don't believe you.

> After start up,  the program only occupy 3 CPU's. But after I apply
> "pstack" command to the process for 3 times, it can use all the 8 CPU's
> on the machine.  What a trick!

    That's not surprising. Attaching to a process may cause spurious wakeups 
which can help a buggy program that deadlocked because it called 
pthread_cond_wait when it should not have.

> I do not blame you if you do not believe it :)

    Believe what? That kicking a broken program can temporarily fix it? Yes, 
I believe that. Now fix the bug and don't call pthread_cond_wait when you 
don't want to wait.

    DS

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