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-rw-r--r--cpukit/score/src/schedulercbs.c66
1 files changed, 60 insertions, 6 deletions
diff --git a/cpukit/score/src/schedulercbs.c b/cpukit/score/src/schedulercbs.c
index 8e5bf86f27..7aa79f2157 100644
--- a/cpukit/score/src/schedulercbs.c
+++ b/cpukit/score/src/schedulercbs.c
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
/**
* @file
*
@@ -11,9 +13,26 @@
* 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.org/license/LICENSE.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
@@ -21,10 +40,17 @@
#endif
#include <rtems/score/schedulercbsimpl.h>
+#include <rtems/score/statesimpl.h>
+#include <rtems/score/threadcpubudget.h>
-void _Scheduler_CBS_Budget_callout(
- Thread_Control *the_thread
-)
+/**
+ * @brief Invoked when a limited time quantum is exceeded.
+ *
+ * This routine is invoked when a limited time quantum is exceeded.
+ *
+ * @param the_thread The thread that exceeded a limited time quantum.
+ */
+static void _Scheduler_CBS_Budget_callout( Thread_Control *the_thread )
{
Scheduler_CBS_Node *node;
Scheduler_CBS_Server_id server_id;
@@ -52,6 +78,34 @@ void _Scheduler_CBS_Budget_callout(
}
}
+static void _Scheduler_CBS_Budget_at_tick( Thread_Control *the_thread )
+{
+ uint32_t budget_available;
+
+ if ( !the_thread->is_preemptible ) {
+ return;
+ }
+
+ if ( !_States_Is_ready( the_thread->current_state ) ) {
+ return;
+ }
+
+ budget_available = the_thread->CPU_budget.available;
+
+ if ( budget_available == 1 ) {
+ the_thread->CPU_budget.available = 0;
+ _Scheduler_CBS_Budget_callout ( the_thread );
+ } else {
+ the_thread->CPU_budget.available = budget_available - 1;
+ }
+}
+
+const Thread_CPU_budget_operations _Scheduler_CBS_Budget = {
+ .at_tick = _Scheduler_CBS_Budget_at_tick,
+ .at_context_switch = _Thread_CPU_budget_do_nothing,
+ .initialize = _Thread_CPU_budget_do_nothing
+};
+
int _Scheduler_CBS_Initialize(void)
{
return SCHEDULER_CBS_OK;