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Full Discussion: UNIX Message Queues vs. Sockets
Top Forums UNIX for Advanced & Expert Users UNIX Message Queues vs. Sockets Post 302111200 by Perderabo on Tuesday 20th of March 2007 01:42:50 AM
Old 03-20-2007
There are two flavors of message queues... the old System V version (msgsend(), msgget(), etc) and the newer Posix version (mq_send(), mq_recieve(), etc). The Posix version is newer and more efficient.

Someone must be listening to a socket or you can't use it. A message queue stores the data until some process reads it. This could be minutes or hours later. Also you could have several processes take turns reading a message queue...like the tellers at a bank taking the next customer from a common queue. If the queue gets too long, add another teller at the bank or another instance of a server process on your system.
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LEARN ABOUT CENTOS

mq_unlink

MQ_UNLINK(3)						     Linux Programmer's Manual						      MQ_UNLINK(3)

NAME

       mq_unlink - remove a message queue

SYNOPSIS

       #include <mqueue.h>

       int mq_unlink(const char *name);

       Link with -lrt.

DESCRIPTION

       mq_unlink()  removes  the specified message queue name.	The message queue name is removed immediately.	The queue itself is destroyed once
       any other processes that have the queue open close their descriptors referring to the queue.

RETURN VALUE

       On success mq_unlink() returns 0; on error, -1 is returned, with errno set to indicate the error.

ERRORS

       EACCES The caller does not have permission to unlink this message queue.

       ENAMETOOLONG
	      name was too long.

       ENOENT There is no message queue with the given name.

CONFORMING TO

       POSIX.1-2001.

SEE ALSO

       mq_close(3), mq_getattr(3), mq_notify(3), mq_open(3), mq_receive(3), mq_send(3), mq_overview(7)

COLOPHON

       This page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2010-08-29							      MQ_UNLINK(3)
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