On Feb 14, 2013 11:55 PM, "Chris Herssens" wrote:

If I define a structure that contains a shared_ptr. Can I put this

structure in a lockfree queue ?

No. Any struct with nontrivial member is also nontrivial. Here when I say nontrivial, I mean that it cannot simply be bitwise copied. Brian Brian

On Fri, Feb 15, 2013 at 7:43 AM, Johannes Stallkamp wrote:

Hi Chris,

Am 14.02.2013 19:17, schrieb chris:

...

Hello All,

If we can't use shared_ptr in a lockfree queue, how can I share data between different queue ?

I have some data that I have to be put in different queues and I want to avoid that I have to copy this data for each queue.

We are in a similar situation concerning the need that the objects are usually passed along as shared_ptr's but at some point need to be passed to a worker thread via a lock-free queue.

To solve this problem, we allocate a copy of the shared_ptr on the heap and pass the raw pointer (to the shared_ptr) into the queue. Of course, in this case, the receiving worker thread needs to take care of deleting the heap-allocated shared_ptr.

HTH, Johannes _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

Although this is only opinion, if you truly need shared_ptr, it's probably better to use std::queue and a boost::mutex unless you are absolutely sure that you require lock free data structures. The author of the library himself will tell you that it's not always faster to use the lockfree::queue than to use a std::queue with a mutex. Brian