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author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-05-14 13:50:48 +0200 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2014-05-15 12:18:44 +0200 |
commit | f39f667a69cf5c4bc0dd4555537615022767f0f9 (patch) | |
tree | f8a48b3c7bf443001b036ddcab6ed104210e6134 /cpukit/score/src/schedulerpriorityenqueue.c | |
parent | score: Add and use _Scheduler_Get_context() (diff) | |
download | rtems-f39f667a69cf5c4bc0dd4555537615022767f0f9.tar.bz2 |
score: Simplify _Thread_Change_priority()
The function to change a thread priority was too complex. Simplify it
with a new scheduler operation. This increases the average case
performance due to the simplified logic. The interrupt disabled
critical section is a bit prolonged since now the extract, update and
enqueue steps are executed atomically. This should however not impact
the worst-case interrupt latency since at least for the Deterministic
Priority Scheduler this sequence can be carried out with a wee bit of
instructions and no loops.
Add _Scheduler_Change_priority() to replace the sequence of
- _Thread_Set_transient(),
- _Scheduler_Extract(),
- _Scheduler_Enqueue(), and
- _Scheduler_Enqueue_first().
Delete STATES_TRANSIENT, _States_Is_transient() and
_Thread_Set_transient() since this state is now superfluous.
With this change it is possible to get rid of the
SCHEDULER_SMP_NODE_IN_THE_AIR state. This considerably simplifies the
implementation of the new SMP locking protocols.
Diffstat (limited to '')
-rw-r--r-- | cpukit/score/src/schedulerpriorityenqueue.c | 37 |
1 files changed, 0 insertions, 37 deletions
diff --git a/cpukit/score/src/schedulerpriorityenqueue.c b/cpukit/score/src/schedulerpriorityenqueue.c deleted file mode 100644 index aa901cc978..0000000000 --- a/cpukit/score/src/schedulerpriorityenqueue.c +++ /dev/null @@ -1,37 +0,0 @@ -/** - * @file - * - * @brief Scheduler Priority Enqueue - * @ingroup ScoreScheduler - */ - -/* - * COPYRIGHT (c) 2011. - * On-Line Applications Research Corporation (OAR). - * - * The license and distribution terms for this file may be - * found in the file LICENSE in this distribution or at - * http://www.rtems.org/license/LICENSE. - */ - -#if HAVE_CONFIG_H -#include "config.h" -#endif - -#include <rtems/score/schedulerpriorityimpl.h> - -void _Scheduler_priority_Enqueue( - const Scheduler_Control *scheduler, - Thread_Control *the_thread -) -{ - Scheduler_priority_Context *context = - _Scheduler_priority_Get_context( scheduler ); - Scheduler_priority_Node *node = _Scheduler_priority_Node_get( the_thread ); - - _Scheduler_priority_Ready_queue_enqueue( - the_thread, - &node->Ready_queue, - &context->Bit_map - ); -} |