1 files changed, 102 insertions, 0 deletions
diff --git a/cpukit/include/rtems/score/threadcpubudget.h b/cpukit/include/rtems/score/threadcpubudget.h
new file mode 100644
index 0000000000..e1d18ef6ed
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+++ b/cpukit/include/rtems/score/threadcpubudget.h
@@ -0,0 +1,102 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/**
+ * @file
+ *
+ * @ingroup RTEMSScoreThread
+ *
+ * @brief This header file provides interfaces used to implement the CPU budget
+ *   management of threads.
+ */
+
+/*
+ * Copyright (C) 2021 embedded brains GmbH & Co. KG
+ *
+ * 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.
+ */
+
+#ifndef _RTEMS_SCORE_THREADCPUBUDGET_H
+#define _RTEMS_SCORE_THREADCPUBUDGET_H
+
+#include <rtems/score/thread.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @addtogroup RTEMSScoreThread
+ *
+ * @{
+ */
+
+/**
+ * @brief Does nothing.
+ *
+ * @param the_thread is an unused parameter.
+ */
+void _Thread_CPU_budget_do_nothing( Thread_Control *the_thread );
+
+/**
+ * @brief Sets the available CPU budget of the thread to the configured clock
+ *   ticks per timeslice.
+ *
+ * @param the_thread is the thread to set the available CPU budget.
+ */
+void _Thread_CPU_budget_set_to_ticks_per_timeslice(
+  Thread_Control *the_thread
+);
+
+/**
+ * @brief Consumes one time quantum of the available CPU budget of the thread
+ *   and yields the thread if the available CPU budget is fully consumed.
+ *
+ * While the thread enabled the non-preemptive mode or is not ready, no time
+ * quantum is consumed.
+ *
+ * @param the_thread is the thread to operate on.
+ */
+void _Thread_CPU_budget_consume_and_yield( Thread_Control *the_thread );
+
+/**
+ * @brief These CPU budget operations allocate timeslices to the thread.
+ *
+ * The timeslice is not reset at a context switch to the thread.  Once a
+ * timeslice is consumed, the thread yields.
+ */
+extern const Thread_CPU_budget_operations _Thread_CPU_budget_exhaust_timeslice;
+
+/**
+ * @brief These CPU budget operations allocate timeslices to the thread.
+ *
+ * The timeslice is reset at a context switch to the thread.  Once a timeslice
+ * is consumed, the thread yields.
+ */
+extern const Thread_CPU_budget_operations _Thread_CPU_budget_reset_timeslice;
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTEMS_SCORE_THREADCPUBUDGET_H */