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author | Joel Sherrill <joel.sherrill@OARcorp.com> | 2010-11-24 15:51:28 +0000 |
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committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 2010-11-24 15:51:28 +0000 |
commit | 0faa9dad0768f0291cb44d8d0dcb74fd3f362cc2 (patch) | |
tree | 5fdf3fb63a7b901897891cf25b3958c9a750ed69 /cpukit/score/src/schedulerpriorityyield.c | |
parent | Remove duplicate entry. (diff) | |
download | rtems-0faa9dad0768f0291cb44d8d0dcb74fd3f362cc2.tar.bz2 |
2010-11-24 Gedare Bloom <giddyup44@yahoo.com>
PR 1647/cpukit
* posix/src/nanosleep.c, posix/src/sched_yield.c,
rtems/src/taskwakeafter.c, sapi/include/confdefs.h,
sapi/include/rtems/config.h, sapi/src/exinit.c, score/Makefile.am,
score/preinstall.am, score/include/rtems/score/prioritybitmap.h,
score/include/rtems/score/thread.h,
score/inline/rtems/score/thread.inl, score/src/thread.c,
score/src/threadchangepriority.c, score/src/threadclearstate.c,
score/src/threadclose.c, score/src/threadinitialize.c,
score/src/threadready.c, score/src/threadresume.c,
score/src/threadsetpriority.c, score/src/threadsetstate.c,
score/src/threadsettransient.c, score/src/threadsuspend.c,
score/src/threadtickletimeslice.c: Refactor scheduler out of thread
handler to facilitate alternate scheduler implementations.
* score/src/threadyieldprocessor.c: Removed.
* score/src/schedulerprioritythreadschedulerupdate.c,
score/src/schedulerprioritythreadschedulerfree.c,
score/src/schedulerpriorityblock.c, score/src/scheduler.c,
score/src/schedulerprioritythreadschedulerallocate.c,
score/src/schedulerpriorityunblock.c,
score/src/schedulerpriority.c, score/src/schedulerpriorityyield.c,
score/include/rtems/score/schedulerpriority.h,
score/include/rtems/score/scheduler.h,
score/inline/rtems/score/scheduler.inl,
score/inline/rtems/score/schedulerpriority.inl: New files.
Diffstat (limited to 'cpukit/score/src/schedulerpriorityyield.c')
-rw-r--r-- | cpukit/score/src/schedulerpriorityyield.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/cpukit/score/src/schedulerpriorityyield.c b/cpukit/score/src/schedulerpriorityyield.c new file mode 100644 index 0000000000..1a13a4e318 --- /dev/null +++ b/cpukit/score/src/schedulerpriorityyield.c @@ -0,0 +1,77 @@ +/* + * Scheduler Handler + * + * Copyright (C) 2010 Gedare Bloom. + * + * The license and distribution terms for this file may be + * found in found in the file LICENSE in this distribution or at + * http://www.rtems.com/license/LICENSE. + * + * $Id$ + */ + +#if HAVE_CONFIG_H +#include "config.h" +#endif + +#include <rtems/system.h> +#include <rtems/score/apiext.h> +#include <rtems/score/context.h> +#include <rtems/score/interr.h> +#include <rtems/score/isr.h> +#include <rtems/score/object.h> +#include <rtems/score/priority.h> +#include <rtems/score/scheduler.h> +#include <rtems/score/states.h> +#include <rtems/score/sysstate.h> +#include <rtems/score/thread.h> +#include <rtems/score/threadq.h> +#include <rtems/score/userext.h> +#include <rtems/score/wkspace.h> + +/* + * _Scheduler_priority_Yield + * + * This kernel routine will remove the running THREAD from the ready queue + * and place it immediately at the rear of this chain. Reset timeslice + * and yield the processor functions both use this routine, therefore if + * reset is true and this is the only thread on the queue then the + * timeslice counter is reset. The heir THREAD will be updated if the + * running is also the currently the heir. + * + * Input parameters: + * the_scheduler - pointer to scheduler control + * + * Output parameters: NONE + * + * INTERRUPT LATENCY: + * ready chain + * select heir + */ + +void _Scheduler_priority_Yield( + Scheduler_Control *the_scheduler +) +{ + ISR_Level level; + Thread_Control *executing; + Chain_Control *ready; + + executing = _Thread_Executing; + ready = executing->scheduler.priority->ready_chain; + _ISR_Disable( level ); + if ( !_Chain_Has_only_one_node( ready ) ) { + _Chain_Extract_unprotected( &executing->Object.Node ); + _Chain_Append_unprotected( ready, &executing->Object.Node ); + + _ISR_Flash( level ); + + if ( _Thread_Is_heir( executing ) ) + _Thread_Heir = (Thread_Control *) ready->first; + _Thread_Dispatch_necessary = true; + } + else if ( !_Thread_Is_heir( executing ) ) + _Thread_Dispatch_necessary = true; + + _ISR_Enable( level ); +} |