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[[!meta copyright="Copyright © 2007, 2008 Free Software Foundation, Inc."]]
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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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