Hi Tim, I tried using lockfree::queue but I keep getting a crash. My configuration: boost 1.53 beta1, g++ 4.5 / clang (from trunk, a few weeks old), both in c+11, i7 6 cores / 12 threads. My test program is pretty much your example, except that my data is not an int but a boost::function. As a note, the crash seems to happen only when I have many consumers. Many producers and one consumer seem to be ok. Am I doing something wrong? Thanks, Christophe #include <boost/thread/thread.hpp> #include <boost/lockfree/queue.hpp> #include <boost/function.hpp> #include <boost/atomic.hpp> boost::lockfree::queue<boost::function<void()> > lfqueue(10000); boost::atomic<bool> done (false); struct empty_task { void operator()()const { } }; void producer(void) { for (int i = 0; i != 10000000; ++i) { boost::function<void()> task = empty_task(); while (!lfqueue.push(task)) { boost::this_thread::yield(); } } } void consumer() { while (!done) { boost::function<void()> res; if (!lfqueue.pop(res)) { boost::this_thread::yield(); } else { res(); } } } void test_lockfree_queue() { boost::thread_group producer_threads, consumer_threads; for (int i = 0; i != 1; ++i) producer_threads.create_thread(producer); for (int i = 0; i != 12; ++i) consumer_threads.create_thread(consumer); producer_threads.join_all(); done = true; consumer_threads.join_all(); } int main() { test_lockfree_queue(); return 0; }