[Boost-users] shared_ptr and weak_ptr concurrency

Subject: [Boost-users] shared_ptr and weak_ptr concurrency
From: Rajeev Rao (rbsrao79_at_[hidden])
Date: 2009-08-31 20:32:25

This is the first time I'm using boost in a multi-threaded env (linux x86_64,gcc 4).
 This question may have been asked in other forms. However, from what I've been able to search (google) up, I could not get a crystal clear answer.  I'm essentially trying to use the solution provided in this page. 
http://onlamp.com/pub/a/onlamp/2006/05/04/smart-pointers.html?page=5. 
>From the boost documentation, it appears that this could be an  undefined operation as the global shared pointer is being read and written to by multiple threads. Is that correct ? 
In case the link fails  or someone wants more details, please read on. 
I've got a n reader threads and 1 writer thread. 
initializion Thread : shared_ptr< MyClass > global_ptr(createNewObject()) ;
WriterThread :global_ptr.reset( createNewObject())

ReaderThreads:weak_ptr<MyClass> local_weak_ptr (globally_ptr) ;...
if(shared_ptr< MyClass > local_shared_ptr = local_weak_ptr.lock() ) { // using local_shared_ptr.} else {    // recreate weak ptr from global ?}

thanks.
Rajeev