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author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2015-02-26 10:33:36 +0100 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2015-03-05 11:36:19 +0100 |
commit | b8a5abf3fafa9df7cc0354c0ada6192c38e78354 (patch) | |
tree | a20b108ecbf95fa3e401a8073d7f35603b4bf2e1 /cpukit/score/src/schedulersimpleunblock.c | |
parent | score: Add and use PRIORITY_PSEUDO_ISR (diff) | |
download | rtems-b8a5abf3fafa9df7cc0354c0ada6192c38e78354.tar.bz2 |
score: Update _Thread_Heir only if necessary
Previously, the _Thread_Heir was updated unconditionally in case a new
heir was determined. The _Thread_Dispatch_necessary was only updated in
case the executing thread was preemptible or an internal thread was
unblocked. Change this to update the _Thread_Heir and
_Thread_Dispatch_necessary only in case the currently selected heir
thread is preemptible or a dispatch is forced. Move the schedule
decision into the change priority operation and use the schedule
operation only in rtems_task_mode() in case preemption is enabled or an
ASR dispatch is necessary. This is a behaviour change. Previously, the
RTEMS_NO_PREEMPT also prevented signal delivery in certain cases (not
always). Now, signal delivery is no longer influenced by
RTEMS_NO_PREEMPT. Since the currently selected heir thread is used to
determine if a new heir is chosen, non-preemptible heir threads
currently not executing now prevent a new heir. This may have an
application impact, see change test tm04. Document this change in sp04.
Update #2273.
Diffstat (limited to 'cpukit/score/src/schedulersimpleunblock.c')
-rw-r--r-- | cpukit/score/src/schedulersimpleunblock.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/cpukit/score/src/schedulersimpleunblock.c b/cpukit/score/src/schedulersimpleunblock.c index 6f9b2f719f..a020f74767 100644 --- a/cpukit/score/src/schedulersimpleunblock.c +++ b/cpukit/score/src/schedulersimpleunblock.c @@ -44,10 +44,10 @@ Scheduler_Void_or_thread _Scheduler_simple_Unblock( * a pseudo-ISR system task, we need to do a context switch. */ if ( the_thread->current_priority < _Thread_Heir->current_priority ) { - _Thread_Heir = the_thread; - if ( _Thread_Executing->is_preemptible || - the_thread->current_priority == 0 ) - _Thread_Dispatch_necessary = true; + _Scheduler_Update_heir( + the_thread, + the_thread->current_priority == PRIORITY_PSEUDO_ISR + ); } SCHEDULER_RETURN_VOID_OR_NULL; |