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[[license text="""
Copyright © 2007 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document under the
terms of the GNU Free Documentation License, Version 1.2 or any later version
published by the Free Software Foundation; with no Invariant Sections, no
Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included
in the section entitled [[GNU_Free_Documentation_License|/fdl.txt]].
By contributing to this page, you agree to assign copyright for your
contribution to the Free Software Foundation. The Free Software Foundation
promises to always use either a verbatim copying license or a free
documentation license when publishing your contribution. We grant you back all
your rights under copyright, including the rights to copy, modify, and
redistribute your contributions.
"""]]
Mach's [[IPC]] mechanism allows for getting access to a message's sequence
number.
This can be used for serializing requests in a multithreaded environment.
* [GNU Mach Reference Manual: 4.2.6 Message
Receive](http://www.gnu.org/software/hurd/gnumach-doc/Message-Receive.html)
* [GNU Mach Reference Manual: 4.3.6 Receive
Rights](http://www.gnu.org/software/hurd/gnumach-doc/Receive-Rights.html)
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