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[[meta copyright="Copyright © 2007 Free Software Foundation, Inc."]]
[[meta license="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]]."]]
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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