Dear all, I use the message queue. I create a queue inside a thread (called Thread A) and I use it in another thread (called Thread B). I get this error: Cannot Allocate memory. This is the code related to the Thread A: message_queue::remove(InterprocessQueueName.c_str()); message_queue mq(open_or_create,InterprocessQueueName.c_str(),MAX_INTERPROCESS_SEND_QUEUE_SIZE,CalculatingSizeStructure::maxSizeHMIExtMessage); for(;;) { try { unsigned int priority; std::size_t recvd_size; mq.receive(msgBuffer, CalculatingSizeStructure::maxSizeHMIExtMessage, recvd_size, priority); ... } catch (interprocess_exception &ex) { ... } } This is the code related to the Thread B: boost::interprocess::message_queue *mq = InterprocessQueueManager::getInstance()->openQueue("Library_Queue"); if((mq->try_send(&msgCmdSendStatusToLibraryInfoR,sizeof(LibraryInfo),0))==false) {... } I've looked for that exception, and it seems to be related to the POSIX queue. I've also tried some solutions without results. Any ideas? Thanks in advance, Best Regards Antonio