Hi - I'm using asio::io_service as a dispatcher for a thread pool. I'm wondering how I can synchronize the threads after I post the tasks to the io_service. I tried using a barrier but it doesn't always work correctly. The barrier waits indefinitely; although I verified the post() function gets called, the io_service doesn't seem to dispatch anything. I've also thread using the boost::threadpool library but the overall speed is slower. I'd appreciate any insight on what I'm doing wrong with the barrier or any other high performance thread pooling alternatives. Thanks, Daren <code> void handler ( int i, int nSize, double *pArray, double *pTemp, boost::barrier *pBarrier ) {     // compute on pArrray --> write result to pTemp[i] ....     pBarrier->wait(); } double doCalc ( int nSize, double *pArray, double *pTemp ) {     unsigned  int nNumThreads = 8;     int nSubSize = nSize / nNumThreads;     boost::barrier barrier( nNumThreads + 1 );     for( int i=0;i