[Boost-users] Re: Problem using Boost.thread : Class destructor calledseveral times!

From: Mark Sizer (boost_at_[hidden])
Date: 2003-10-08 14:50:18

I converted existing code to boost::thread, so I didn't have to make 
this design decision, it was already made.

My threaded object is of handle class. The actual thread processing (and 
member variables, including a socket) takes place in the body object.

It doesn't matter how many times the handle is copied (and destroyed) 
becaue they all point to the same body.

There is, no doubt, a more efficient way of doing this (e.g. some sort 
of shared pointer). I didn't have to do the research to figure it out, 
though.

Good luck,
  - Mark

Huck finn wrote:

> Ok, now I see that my object is being copied. But for the lines :
> 
>     FakeClass *item1 = new FakeClass(1);//,item2(2);
>     group.create_thread(*item1);
> 
> I get :
> 
> FakeClass #1 says : I'm alive!
> FakeClass #1 says : Being Copied!!
> FakeClass #1 says : Being Copied!!
> FakeClass #1 says : Being Copied!!
> FakeClass #1 says : I'm being destroyed!
> FakeClass #1 says : I'm being destroyed!
> FakeClass #1 says : Being Copied!!
> FakeClass #1 says : I'm being destroyed!
> Thread for FakeClass #1 has been started!
> FakeClass #1 says : I'm being destroyed!
>   main ending...
> 
> 
> The copy constructor is called 4 times!!! And it is called 3 times 
> before the thread has even started! Is there a way to avoid that ?
> 
> I was going to use the thread_group to manage the connection to a simple 
> server applications, so that all the threads would hold info about the 
> socket used for connection, etc... And that if the objectdestructor is 
> called, the connection to the socket would be closed... With my object 
> being destroyed 3 times before the thread has started, it gets a bit 
> hard to manage that way... Any clue on how to use the threads so that it 
> would work?
> 
> thanks,
> 
> Simon
> 
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