Re: [boost] boost::thread segfault

From: Ulrich Eckhardt (doomster_at_[hidden])
Date: 2008-01-26 04:13:53

On Friday 25 January 2008 19:40, James Sutherland wrote:
> Any thoughts on what could be causing this?  I am using boost_1_34_0.  I
> don¹t know if this is relevant, but I have a thread adaptor class that
> looks like:
> >   class ThreadAdaptor
> >   {
> >   public:
> >     ThreadAdaptor( ExpressionBase& expr ) : expr_(expr) {}
> >     ThreadAdaptor(const ThreadAdaptor& ta) : expr_(ta.expr_) {}
> >     ~ThreadAdaptor(){}
> >     void operator()(){ expr_.evaluate(); }
> >   private:
> >     ThreadAdaptor& operator=(const ThreadAdaptor&); // no assignment
> >     ExpressionBase& expr_;
> >   };

If the "ExpressionBase" object is destroyed, that will also render this object 
unusable and crash any thread currently working on it, too, so you need to 
make sure that doesn't happen. Otherwise, can you provide a minimal 
compilable example?

Lastly, your class above is superfluous:

  ExpressionBase x;
  boost::thread th( boost::bind( &ExpressionBase::evaluate, &x));

I.e. you use boost::bind to get a callable from a memberfunction. Note that 
passing 'x' into bind will also work but make a copy of it. You can prevent 
that using boost::ref() and boost::cref().

Uli