Hi I'm trying to use a message with a blocked (or timeout) receiver through the receive (or timed_receive) method(s). But the problem is that I can open the message once and then, I always get the "No such file or directory" message. It looks like the method can open the message queue on reading mode only once since each time that I launch it after, it ends right after the constructor of the message_queue object. I forced the program which send data on the message queue to be running through an infinite loop and I don't use a destructor on the message object inside the sending program. So I assume that the message_queue is still there. So, my question is : is there a real limitation which force me to open the message queue only one time in open_only mode ? Thanks in advance for the help. Johan Mazel