Caution: This version of this document is no longer maintained. For the latest documentation, see


Manage message queues (QNX Neutrino)

Note: You must be root to start this manager.


mqueue &

Runs on:



There are no options for the mqueue manager.


The mqueue manager implements POSIX 1003.1b message queues. When you create a queue, it appears in the pathname space under /dev/mqueue.

Note: The /dev/mqueue directory doesn't appear until you actually create a queue.

The traditional POSIX message queue manager is a resource manager that uses messages to communicate with its clients. You can access it locally or remotely, allowing for network-wide message queues. On a self-hosted Neutrino system, the default sysinit script starts mqueue; for more information, see the Controlling How Neutrino Starts chapter of the Neutrino User's Guide.

Note: Starting with release 6.3.0, procnto manages named semaphores, which mqueue used to do (mqueue still manages named semaphores if it detects that procnto isn't doing so).

For more information, see the Managing POSIX Message Queues technote.

See also:

mq, procnto*

mq_close(), mq_getattr(), mq_notify(), mq_open(), mq_receive(), mq_send(), mq_setattr(), mq_unlink() in the Neutrino Library Reference

Controlling How Neutrino Starts in the Neutrino User's Guide

Managing POSIX Message Queues technote