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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2013-07-31 13:30:42 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2013-08-01 16:45:46 +0200 |
| commit | 9bf74673f928788b0ea4addabf045b94844d40ff (patch) | |
| tree | 495ca384343769feefd96f88061ccc5ed5f192bb /cpukit/score/src/coretod.c | |
| parent | score: Move nanoseconds since last tick support (diff) | |
| download | rtems-9bf74673f928788b0ea4addabf045b94844d40ff.tar.bz2 | |
score: Use an ISR lock for TOD
Two issues are addressed.
1. On single processor configurations the set/get of the now/uptime
timestamps is now consistently protected by ISR disable/enable
sequences. Previously nested interrupts could observe partially written
values since 64-bit writes are not atomic on 32-bit architectures in
general. This could lead to non-monotonic uptime timestamps.
2. The TOD now/uptime maintanence is now independent of the giant lock.
This is the first step to remove the giant lock in _Thread_Dispatch().
Diffstat (limited to 'cpukit/score/src/coretod.c')
| -rw-r--r-- | cpukit/score/src/coretod.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/cpukit/score/src/coretod.c b/cpukit/score/src/coretod.c index 3359d4e8ca..25edef021d 100644 --- a/cpukit/score/src/coretod.c +++ b/cpukit/score/src/coretod.c @@ -29,6 +29,8 @@ void _TOD_Handler_initialization(void) { TOD_Control *tod = &_TOD; + _ISR_lock_Initialize( &tod->lock ); + _Timestamp_Set( &tod->now, TOD_SECONDS_1970_THROUGH_1988, 0 ); _Timestamp_Set_to_zero( &tod->uptime ); |