From eb02f47b126b56091ffaeaad470a48e2ac6d57b5 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Wed, 10 Nov 1999 13:48:27 +0000
Subject: Committed modifications from ITRON Task and Task Dependendent
 Synchronization Working Group.  Included are tests.

---
 c/src/exec/score/src/threadresume.c | 95 +++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 c/src/exec/score/src/threadresume.c

(limited to 'c/src/exec/score/src/threadresume.c')

diff --git a/c/src/exec/score/src/threadresume.c b/c/src/exec/score/src/threadresume.c
new file mode 100644
index 0000000000..067dc59610
--- /dev/null
+++ b/c/src/exec/score/src/threadresume.c
@@ -0,0 +1,95 @@
+/*
+ *  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_Resume
+ *
+ *  This kernel routine clears the SUSPEND state if the suspend_count
+ *  drops below one.  If the force parameter is set the suspend_count
+ *  is forced back to zero. The thread ready chain is adjusted if
+ *  necessary and the Heir thread is set accordingly.
+ *
+ *  Input parameters:
+ *    the_thread - pointer to thread control block
+ *    force      - force the suspend count back to 0
+ *
+ *  Output parameters:  NONE
+ *
+ *  INTERRUPT LATENCY:
+ *    priority map
+ *    select heir
+ */
+
+
+void _Thread_Resume(
+  Thread_Control   *the_thread,
+  boolean           force
+)
+{
+
+  ISR_Level       level;
+  States_Control  current_state;
+
+  _ISR_Disable( level );
+  
+  if ( force == TRUE )
+    the_thread->suspend_count = 0;
+  else
+    the_thread->suspend_count--;
+
+  if ( the_thread->suspend_count > 0 ) {
+    _ISR_Enable( level );
+    return;
+  }
+
+  current_state = the_thread->current_state;
+  if ( current_state & STATES_SUSPENDED ) {
+    current_state = 
+    the_thread->current_state = _States_Clear(STATES_SUSPENDED, current_state);
+
+    if ( _States_Is_ready( current_state ) ) {
+
+      _Priority_Add_to_bit_map( &the_thread->Priority_map );
+
+      _Chain_Append_unprotected(the_thread->ready, &the_thread->Object.Node);
+
+      _ISR_Flash( level );
+
+      if ( the_thread->current_priority < _Thread_Heir->current_priority ) {
+        _Thread_Heir = the_thread;
+        if ( _Thread_Executing->is_preemptible ||
+             the_thread->current_priority == 0 )
+          _Context_Switch_necessary = TRUE;
+      }
+    }
+  }
+
+  _ISR_Enable( level );
+}
-- 
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