diff packages/kernel/current/include/sched.inl @ 0:3111d98ba7b3 ecos-v1_1-release

Initial commit of eCos version 1.1
author jlarmour
date Tue, 11 May 1999 11:16:07 +0000
parents
children 443894e2e912
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+#ifndef CYGONCE_KERNEL_SCHED_INL
+#define CYGONCE_KERNEL_SCHED_INL
+
+//==========================================================================
+//
+//	sched.inl
+//
+//	Scheduler class inlines
+//
+//==========================================================================
+//####COPYRIGHTBEGIN####
+//
+// -------------------------------------------
+// The contents of this file are subject to the Cygnus eCos Public License
+// Version 1.0 (the "License"); you may not use this file except in
+// compliance with the License.  You may obtain a copy of the License at
+// http://sourceware.cygnus.com/ecos
+// 
+// Software distributed under the License is distributed on an "AS IS"
+// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the
+// License for the specific language governing rights and limitations under
+// the License.
+// 
+// The Original Code is eCos - Embedded Cygnus Operating System, released
+// September 30, 1998.
+// 
+// The Initial Developer of the Original Code is Cygnus.  Portions created
+// by Cygnus are Copyright (C) 1998 Cygnus Solutions.  All Rights Reserved.
+// -------------------------------------------
+//
+//####COPYRIGHTEND####
+//==========================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s): 	nickg
+// Contributors:	nickg
+// Date:	1997-09-09
+// Purpose:	Define inlines for scheduler classes
+// Description:	Inline functions for the scheduler classes. These are
+//              not defined in the header so that we have the option
+//              of making them non-inline.
+// Usage:
+//              #include <cyg/kernel/sched.hxx>
+//              ...
+//		#include <cyg/kernel/sched.inl>
+//		...
+//
+//####DESCRIPTIONEND####
+//
+//==========================================================================
+
+#include <cyg/kernel/instrmnt.h>
+
+#include <cyg/kernel/thread.inl>   // we use some thread inlines here
+
+// -------------------------------------------------------------------------
+// Inlines for Cyg_Scheduler class
+
+inline void Cyg_Scheduler::lock()
+{
+    // We do not need to do a read-modify-write sequence here because
+    // the scheduler lock is strictly nesting. Even if we are interrupted
+    // partway through the increment, the lock will be returned to the same
+    // value before we are resumed/rescheduled.
+
+    sched_lock++;
+
+    HAL_REORDER_BARRIER();
+
+    CYG_INSTRUMENT_SCHED(LOCK,sched_lock,0);
+};
+
+inline void Cyg_Scheduler::unlock()
+{
+    // This is an inline wrapper for the real scheduler unlock function in
+    // Cyg_Scheduler::unlock_inner().
+    
+    // Only do anything if the lock is about to go zero, otherwise we simply
+    // decrement and return. As with lock() we do not need any special code
+    // to decrement the lock counter.
+
+    CYG_INSTRUMENT_SCHED(UNLOCK,sched_lock,0);
+
+    HAL_REORDER_BARRIER();
+    
+    register cyg_ucount32 lock = sched_lock - 1;
+    
+    if( lock == 0 ) unlock_inner();
+    else sched_lock = lock;
+}
+
+
+// -------------------------------------------------------------------------
+// Inlines for Cyg_SchedThread class
+
+inline void Cyg_SchedThread::remove()
+{
+    if( queue != NULL )
+    {
+        queue->remove((Cyg_Thread *)this);
+        queue = NULL;
+    }
+}
+
+// -------------------------------------------------------------------------
+
+#endif // ifndef CYGONCE_KERNEL_SCHED_INL
+// EOF sched.inl