[Boost-users] Re: problems using shared_ptr in threads

13 Jun 2004

      Tristan King wrote:
...
Rene Rivera wrote:
...
Or just don't use boost:ref, and have the thread function objects copied.
Rene, is that possible with a stuct?
Yes, as long as it has default and copy ctors (or usually the auto 
generated ones).
...
the problem is that i need give the thread some initial parameters, and 
i'm not sure if thats possible using a simple function.
The most elegant solution is to use Boost.Bind. For example your 
original code could be written as such:

#include <iostream>
#include 
#include 
#include 

void simple_thread(int i)
{
     std::cout << i << std::endl;
}

int main()
{
   boost::thread_group threads;

   for ( int i = 0 ; i < 5 ; ++i )
   {
       threads.create_thread( boost::bind(&simple_thread,i) );
   };

   threads.join_all( );

   return 0;
}
...
if a thread is created using new
   simple_thread* trd = new simple_thread( p );
and started using:
   threads.create_thread( boost::ref( *trd ) );
trd still needs to be destroyed using "delete" somewhere right?
Yes.
...
or will the memory be free'd when the thread finishes execution?
No.

HTH.

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