...

4) client get this new private port from the server (same method as 2 )

This is where you went astray. The clients wouldn't look the new message queue up in some global namespace, but instead it would be returned to them (privately) as part of the reply to this "connection request" RPC.

...

So now the server does the following fo each new client in the "connection request" RPC. mach_port_t task = mach_task_self(); mach_port_t old_port; mach_port_allocate(task,MACH_PORT_RIGHT_RECEIVE,&clientPort) mach_port_insert_right(task,clientPort,clientPort,MACH_MSG_TYPE_MAKE_SEN D) mach_port_move_member(task,clientPort,serverPort) mach_port_request_notification(task, clientPort, MACH_NOTIFY_NO_SENDERS, 1, serverPort, MACH_MSG_TYPE_MAKE_SEND_ONCE,&old_port); where serverPort will be used by the server in the mach_msg_server. Then clientPort has to be sent back to the client, how is this done? Only by sending the clientPort back? Or the client needs to get a copy of send right to that clientPort Mach message queue alloccated by the server? I'm quite confused... I am also using inter-process server/client Mach semaphores for synchronization purpose. Right now, I was allocating the semaphore on the server side with "semaphore_create" then registering it in the bootstrap namespace using "bootstrap_register" with a name for each semaphore (associated with a given client). Then the client was using "bootstrap_look_up" to get its semaphore. This is working. But I guess registering the semaphores in the bootstrap namespace is not a very good idea, and since Mach semaphores are actually Mach ports, I guess semaphores could be handled exactly like the previous "private port" mechanism for server/client communication. But again I don't understand how the "private port" (or semaphore) allocated on the server side is given back to the client side in a way the client can used them. Thanks for any advice Stephane Letz _______________________________________________ darwin-development mailing list | darwin-development@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-development Do not post admin requests to the list. They will be ignored.