From f39f667a69cf5c4bc0dd4555537615022767f0f9 Mon Sep 17 00:00:00 2001 From: Sebastian Huber Date: Wed, 14 May 2014 13:50:48 +0200 Subject: 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. --- cpukit/score/src/schedulersimpleenqueuefirst.c | 29 -------------------------- 1 file changed, 29 deletions(-) delete mode 100644 cpukit/score/src/schedulersimpleenqueuefirst.c (limited to 'cpukit/score/src/schedulersimpleenqueuefirst.c') diff --git a/cpukit/score/src/schedulersimpleenqueuefirst.c b/cpukit/score/src/schedulersimpleenqueuefirst.c deleted file mode 100644 index 2ea0a15917..0000000000 --- a/cpukit/score/src/schedulersimpleenqueuefirst.c +++ /dev/null @@ -1,29 +0,0 @@ -/** - * @file - * - * @brief Scheduler Simple Enqueue First - * @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 - -void _Scheduler_simple_Enqueue_first( - const Scheduler_Control *scheduler, - Thread_Control *the_thread -) -{ - _Scheduler_simple_Ready_queue_enqueue_first( scheduler, the_thread ); -} -- cgit v1.2.3