diff options
| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-06-12 14:37:57 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-06-12 16:13:26 +0200 |
| commit | 701dd96f598bd58a41884795ba5bf0b5da337d78 (patch) | |
| tree | 2d8374400a2622c19ad5215e0d1e150eebda1396 /cpukit/score/include/rtems/score/threadimpl.h | |
| parent | bsp/realview-pbx-a9: Fix SMP startup (diff) | |
| download | rtems-701dd96f598bd58a41884795ba5bf0b5da337d78.tar.bz2 | |
score: PR2181: Add _Thread_Yield()
The _Scheduler_Yield() was called by the executing thread with thread
dispatching disabled and interrupts enabled. The rtems_task_suspend()
is explicitly allowed in ISRs:
http://rtems.org/onlinedocs/doc-current/share/rtems/html/c_user/Interrupt-Manager-Directives-Allowed-from-an-ISR.html#Interrupt-Manager-Directives-Allowed-from-an-ISR
Unlike the other scheduler operations the locking was performed inside
the operation. This lead to the following race condition. Suppose a
ISR suspends the executing thread right before the yield scheduler
operation. Now the executing thread is not longer in the set of ready
threads. The typical scheduler operations did not check the thread
state and will now extract the thread again and enqueue it. This
corrupted data structures.
Add _Thread_Yield() and do the scheduler yield operation with interrupts
disabled. This has a negligible effect on the interrupt latency.
Diffstat (limited to 'cpukit/score/include/rtems/score/threadimpl.h')
| -rw-r--r-- | cpukit/score/include/rtems/score/threadimpl.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/cpukit/score/include/rtems/score/threadimpl.h b/cpukit/score/include/rtems/score/threadimpl.h index 7e6681bb75..e90346c75f 100644 --- a/cpukit/score/include/rtems/score/threadimpl.h +++ b/cpukit/score/include/rtems/score/threadimpl.h @@ -186,6 +186,8 @@ bool _Thread_Restart( Thread_Entry_numeric_type numeric_argument ); +void _Thread_Yield( Thread_Control *executing ); + bool _Thread_Set_life_protection( bool protect ); void _Thread_Life_action_handler( |