Re: [Fwd: Re: Haunting free(): invalid pointer 0x8a11604!]

[David Sugar]

In older versions of the library you would use "delete this" for 
detached threads.  In the current (1.3) releases, you should NEVER do 
this.  That final() was appearently leftover from before detach behavior 
was changed.  In 1.?2? and definately 1.3, detach deletes the the thread 
the object for you after you exit() the thread, and does it through the 
virtual destructors via the Thread base class.

Nick wrote:
> Ok, your problem is that the TCPSession::final calls delete this when
> the thread ends.
>
> Your choices are
>
> 1) Dont call tcp->detach(), call start()... the thread will be deleted
> automaticall by TCPSession::final
> 2) override virtual void final() in TCPSessionThread, to do nothing.
>
> For the library, TCPSession::final should say if(!isDetached()) delete 
> this;
>
> Rami Saarinen wrote:
>
> > --- Nick Liebmann <address@hidden> wrote:
> >
> >  
> >
> > > I would also suggest declaring empty virtual destructors for any 
> > > inherited classes for which you have no specific
> > > need for a destructor. I dont really know why this should be 
> > > necessary, but for some reason (at least in the past)
> > > I have found this necessary, and now do it as a habit.
> > >
> > > An isolated test-case is definitly the way to go!
> > >   
> >
> >
> > Well I just can't get it any simpler than this. Invalid pointer is still
> > present exactly like before. Am I missing something? Brains?
> >
> > I am using cc++ 1.3.1, gcc 3.3.3 20040412, Fedora Core 2 (Linux). cc++ 
> > was
> > compiled on this machine. 
> > testlistener is the test program.
> >
> > TCPListener is the one that will create TCPSessionThread per connection
> > when there are connections pending.
> > TCPSessionThread does nothing at all (and the invalid pointer error
> > appears in destructor).
> >
> > I linked it with -lccgnu2 -ldl  (used also -lpthread, but it is not 
> > needed
> > really).
> >
> > Valgrind gives this when connecting the test program and sending some 
> > text
> > to it:  
>
>
>
>
>
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