From 05df0a846f436295a490cc9ac19e5a4061c3a575 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Mon, 17 May 1999 20:41:13 +0000
Subject: Thread Handler split into multiple files.  Eventually, as RTEMS is
 split into one function per file, this will decrease the size of executables.

---
 cpukit/score/src/threadchangepriority.c | 109 ++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 cpukit/score/src/threadchangepriority.c

(limited to 'cpukit/score/src/threadchangepriority.c')

diff --git a/cpukit/score/src/threadchangepriority.c b/cpukit/score/src/threadchangepriority.c
new file mode 100644
index 0000000000..9a0e6936a2
--- /dev/null
+++ b/cpukit/score/src/threadchangepriority.c
@@ -0,0 +1,109 @@
+/*
+ *  Thread Handler
+ *
+ *
+ *  COPYRIGHT (c) 1989-1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#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/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>
+
+/*PAGE
+ *
+ *  _Thread_Change_priority
+ *
+ *  This kernel routine changes the priority of the thread.  The
+ *  thread chain is adjusted if necessary.
+ *
+ *  Input parameters:
+ *    the_thread   - pointer to thread control block
+ *    new_priority - ultimate priority
+ *    prepend_it   - TRUE if the thread should be prepended to the chain
+ *
+ *  Output parameters:  NONE
+ *
+ *  INTERRUPT LATENCY:
+ *    ready chain
+ *    select heir
+ */
+
+void _Thread_Change_priority(
+  Thread_Control   *the_thread,
+  Priority_Control  new_priority,
+  boolean           prepend_it
+)
+{
+  ISR_Level level;
+  /* boolean   do_prepend = FALSE; */
+
+  /*
+   *  If this is a case where prepending the task to its priority is
+   *  potentially desired, then we need to consider whether to do it.
+   *  This usually occurs when a task lowers its priority implcitly as
+   *  the result of losing inherited priority.  Normal explicit priority
+   *  change calls (e.g. rtems_task_set_priority) should always do an
+   *  append not a prepend.
+   */
+ 
+  /*
+   *  Techically, the prepend should conditional on the thread lowering
+   *  its priority but that does allow cxd2004 of the acvc 2.0.1 to 
+   *  pass with rtems 4.0.0.  This should change when gnat redoes its
+   *  priority scheme.
+   */
+/*
+  if ( prepend_it &&
+       _Thread_Is_executing( the_thread ) && 
+       new_priority >= the_thread->current_priority )
+    prepend_it = TRUE;
+*/
+                  
+  _Thread_Set_transient( the_thread );
+
+  if ( the_thread->current_priority != new_priority )
+    _Thread_Set_priority( the_thread, new_priority );
+
+  _ISR_Disable( level );
+
+  the_thread->current_state =
+    _States_Clear( STATES_TRANSIENT, the_thread->current_state );
+
+  if ( ! _States_Is_ready( the_thread->current_state ) ) {
+    _ISR_Enable( level );
+    return;
+  }
+
+  _Priority_Add_to_bit_map( &the_thread->Priority_map );
+  if ( prepend_it )
+    _Chain_Prepend_unprotected( the_thread->ready, &the_thread->Object.Node );
+  else
+    _Chain_Append_unprotected( the_thread->ready, &the_thread->Object.Node );
+
+  _ISR_Flash( level );
+
+  _Thread_Calculate_heir();
+
+  if ( !_Thread_Is_executing_also_the_heir() &&
+       _Thread_Executing->is_preemptible )
+    _Context_Switch_necessary = TRUE;
+  _ISR_Enable( level );
+}
-- 
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