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| author | kib <kib@FreeBSD.org> | 2015-06-09 11:49:56 +0000 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2015-06-09 14:56:02 +0200 |
| commit | e1d61fe2aaefa13c45154f7ffedf43fe4c0c4efd (patch) | |
| tree | e5825e486b6b05e7ddccc738a73586ba358d2e22 /doc/user/conf.t | |
| parent | timecounter: Synchronize with FreeBSD (diff) | |
| download | rtems-e1d61fe2aaefa13c45154f7ffedf43fe4c0c4efd.tar.bz2 | |
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
Diffstat (limited to 'doc/user/conf.t')
0 files changed, 0 insertions, 0 deletions