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.

---
 c/src/exec/score/src/threadstartmultitasking.c | 90 ++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 c/src/exec/score/src/threadstartmultitasking.c

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

diff --git a/c/src/exec/score/src/threadstartmultitasking.c b/c/src/exec/score/src/threadstartmultitasking.c
new file mode 100644
index 0000000000..8c9baa70af
--- /dev/null
+++ b/c/src/exec/score/src/threadstartmultitasking.c
@@ -0,0 +1,90 @@
+/*
+ *  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_Start_multitasking
+ *
+ *  This kernel routine readies the requested thread, the thread chain
+ *  is adjusted.  A new heir thread may be selected.
+ *
+ *  Input parameters:
+ *    system_thread - pointer to system initialization thread control block
+ *    idle_thread   - pointer to idle thread control block
+ *
+ *  Output parameters:  NONE
+ *
+ *  NOTE:  This routine uses the "blocking" heir selection mechanism.
+ *         This insures the correct heir after a thread restart.
+ *
+ *  INTERRUPT LATENCY:
+ *    ready chain
+ *    select heir
+ */
+
+void _Thread_Start_multitasking( void )
+{
+  /*
+   *  The system is now multitasking and completely initialized.  
+   *  This system thread now either "goes away" in a single processor 
+   *  system or "turns into" the server thread in an MP system.
+   */
+
+  _System_state_Set( SYSTEM_STATE_UP );
+
+  _Context_Switch_necessary = FALSE;
+
+  _Thread_Executing = _Thread_Heir;
+
+   /*
+    * Get the init task(s) running.
+    *
+    * Note: Thread_Dispatch() is normally used to dispatch threads.  As
+    *       part of its work, Thread_Dispatch() restores floating point
+    *       state for the heir task.
+    *
+    *       This code avoids Thread_Dispatch(), and so we have to restore
+    *       (actually initialize) the floating point state "by hand".
+    *
+    *       Ignore the CPU_USE_DEFERRED_FP_SWITCH because we must always
+    *       switch in the first thread if it is FP.
+    */
+ 
+
+#if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE )
+   /*
+    *  don't need to worry about saving BSP's floating point state
+    */
+
+   if ( _Thread_Heir->fp_context != NULL )
+     _Context_Restore_fp( &_Thread_Heir->fp_context );
+#endif
+
+  _Context_Switch( &_Thread_BSP_context, &_Thread_Heir->Registers );
+}
-- 
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