diff options
author | Joel Sherrill <joel.sherrill@OARcorp.com> | 2011-09-11 20:52:37 +0000 |
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committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 2011-09-11 20:52:37 +0000 |
commit | 5472ad414f5eec7aba13f3d03ee8e35dfdfa406a (patch) | |
tree | 48cbdd803d647379298e1596dcaaf0a68598cc54 /cpukit/score/src/scheduleredf.c | |
parent | 2011-09-09 Sebastian Huber <sebastian.huber@embedded-brains.de> (diff) | |
download | rtems-5472ad414f5eec7aba13f3d03ee8e35dfdfa406a.tar.bz2 |
2011-09-11 Petr Benes <benesp16@fel.cvut.cz>
PR 1896/cpukit
* sapi/include/confdefs.h, score/Makefile.am, score/preinstall.am: Add
Earliest Deadline First (EDF) Scheduling Algorithm implementation.
* score/include/rtems/score/scheduleredf.h, score/src/scheduleredf.c,
score/src/scheduleredfallocate.c, score/src/scheduleredfblock.c,
score/src/scheduleredfenqueue.c,
score/src/scheduleredfenqueuefirst.c,
score/src/scheduleredfextract.c, score/src/scheduleredffree.c,
score/src/scheduleredfprioritycompare.c,
score/src/scheduleredfreleasejob.c, score/src/scheduleredfschedule.c,
score/src/scheduleredfunblock.c, score/src/scheduleredfupdate.c,
score/src/scheduleredfyield.c: New files.
Diffstat (limited to 'cpukit/score/src/scheduleredf.c')
-rw-r--r-- | cpukit/score/src/scheduleredf.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/cpukit/score/src/scheduleredf.c b/cpukit/score/src/scheduleredf.c new file mode 100644 index 0000000000..2aa2d52cea --- /dev/null +++ b/cpukit/score/src/scheduleredf.c @@ -0,0 +1,49 @@ +/* + * Copyright (C) 2011 Petr Benes. + * 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.com/license/LICENSE. + * + * $Id$ + */ + +#if HAVE_CONFIG_H +#include "config.h" +#endif + +#include <rtems/system.h> +#include <rtems/config.h> +#include <rtems/score/scheduler.h> +#include <rtems/score/scheduleredf.h> + +int _Scheduler_EDF_RBTree_compare_function +( + RBTree_Node* n1, + RBTree_Node* n2 +) +{ + Priority_Control value1 = _RBTree_Container_of + (n1,Scheduler_EDF_Per_thread,Node)->thread->current_priority; + Priority_Control value2 = _RBTree_Container_of + (n2,Scheduler_EDF_Per_thread,Node)->thread->current_priority; + + /* + * This function compares only numbers for the red-black tree, + * but priorities have an opposite sense. + */ + return (-1)*_Scheduler_Is_priority_higher_than(value1, value2); +} + +void _Scheduler_EDF_Initialize(void) +{ + _RBTree_Initialize_empty( + &_Scheduler_EDF_Ready_queue, + &_Scheduler_EDF_RBTree_compare_function, + 0 + ); +} + +/* Instantiate any global variables needed by the EDF scheduler */ +RBTree_Control _Scheduler_EDF_Ready_queue; |