[Boost-bugs] [Boost C++ Libraries] #8666: boost::lockfree::spsc_queue::emplace_push

Subject: [Boost-bugs] [Boost C++ Libraries] #8666: boost::lockfree::spsc_queue::emplace_push
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-06-06 22:14:59

#8666: boost::lockfree::spsc_queue::emplace_push
-----------------------------------------------+--------------------------
 Reporter:  aubrey@…                           |      Owner:  timblechmann
     Type:  Feature Requests                   |     Status:  new
Milestone:  To Be Determined                   |  Component:  lockfree
  Version:  Boost 1.53.0                       |   Severity:  Optimization
 Keywords:  spsc_queue queue lockfree emplace  |
-----------------------------------------------+--------------------------
 It would be nice to be able to write the following function:
 {{{
 void producer_thread()
 {
     while(isRunning)
     {
         T& item = q.emplace_write(); // This feature avoids the need to
 create the item
         write(item);
         q.emplace_push(); // This feature avoids the need to copy the item
     }
 }
 }}}

 Implementing this:
 A slow consumer may be reading the item after the write index so the
 change is not as easy as exposing the next item.  The change would require
 a gap of 1 item to always exist to avoid a read/write collision.

 Jason Aubrey

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Ticket URL: <https://svn.boost.org/trac/boost/ticket/8666>
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