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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2015-10-02 07:59:24 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2015-10-02 08:05:21 +0200 |
| commit | ba1ed5240b2f8c724a8efa8f652a8ba391fc92dd (patch) | |
| tree | a19ab9d6a59ec9dc1e8d15da49929e4dcf863d7a | |
| parent | powerpc: Use wrtee for e6500 multilib (diff) | |
| download | rtems-ba1ed5240b2f8c724a8efa8f652a8ba391fc92dd.tar.bz2 | |
SMP: Optimize ticket lock implementation
This reverts the relevant part of commit
da06fe948c0878057e5f563ebd3dfe40c0f1b0d2. The acquire/release order is
superfluous for the next ticket increment. The mutual exclusion is
guaranteed by the acquire load from and release store to the next
serving atomic variable.
| -rw-r--r-- | cpukit/score/include/rtems/score/smplock.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/cpukit/score/include/rtems/score/smplock.h b/cpukit/score/include/rtems/score/smplock.h index ccf6b5993b..f98f38a6a3 100644 --- a/cpukit/score/include/rtems/score/smplock.h +++ b/cpukit/score/include/rtems/score/smplock.h @@ -277,7 +277,7 @@ static inline void _SMP_ticket_lock_Do_acquire( #endif my_ticket = - _Atomic_Fetch_add_uint( &lock->next_ticket, 1U, ATOMIC_ORDER_ACQ_REL ); + _Atomic_Fetch_add_uint( &lock->next_ticket, 1U, ATOMIC_ORDER_RELAXED ); #if defined( RTEMS_PROFILING ) now_serving = |