kib e1d61fe2aa timecounter: Synchronize with FreeBSD
When updating/accessing the timehands, barriers are needed to ensure
that:
- th_generation update is visible after the parameters update is
  visible;
- the read of parameters is not reordered before initial read of
  th_generation.

On UP kernels, compiler barriers are enough.  For SMP machines, CPU
barriers must be used too, as was confirmed by submitter by testing on
the Freescale T4240 platform with 24 PowerPC processors.

Submitted by:	Sebastian Huber <sebastian.huber@embedded-brains.de>
MFC after:	1 week
2015-06-09 14:56:02 +02:00
2013-05-27 14:47:20 +02:00
2013-06-18 13:38:31 +02:00
2013-05-27 14:47:20 +02:00
2013-06-18 13:38:31 +02:00
2012-10-09 19:26:51 +02:00
2013-09-19 13:16:06 +02:00
2015-05-28 14:41:37 +02:00
2013-05-27 14:47:20 +02:00
2013-05-27 14:47:20 +02:00
2013-05-27 14:47:20 +02:00

This is the Real-Time Executive for Multiprocessing Systems (RTEMS).
The version number for this software is indicated in the VERSION file.

See the documentation manuals in doc/ with daily builds available online at
http://rtems.org/onlinedocs/doc-current/share/rtems/html/ and released builds
at http://www.rtems.org/onlinedocs/releases/ for information on building,
installing, and using RTEMS. The INSTALL file tells you to come back here.

See the RTEMS Wiki at http://devel.rtems.org for community knowledge and
tutorials.

RTEMS Doxygen available at http://www.rtems.org/onlinedocs/doxygen/cpukit/html

The RTEMS Project maintains mailing lists which are used for most
discussions:

* For general-purpose questions related to using RTEMS, use the
  rtems-users ml: https://lists.rtems.org/mailman/listinfo/users
* For questions and discussion related to development of RTEMS, use the
  rtems-devel ml: https://lists.rtems.org/mailman/listinfo/devel

See https://devel.rtems.org/ to view existing or file a new issue
report ticket.

Description
RTEMS is a ​real-time executive in use by embedded systems applications around the world and beyond
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