score: Make FIFO thread queue ops public

Update #4232.

3 files changed, 144 insertions, 8 deletions

diff --git a/cpukit/headers.am b/cpukit/headers.am
index fcf679f09d..6bd0535a74 100644
--- a/cpukit/headers.am
+++ b/cpukit/headers.am
@@ -416,6 +416,7 @@ include_rtems_score_HEADERS += include/rtems/score/threadimpl.h
 include_rtems_score_HEADERS += include/rtems/score/threadmp.h
 include_rtems_score_HEADERS += include/rtems/score/threadq.h
 include_rtems_score_HEADERS += include/rtems/score/threadqimpl.h
+include_rtems_score_HEADERS += include/rtems/score/threadqops.h
 include_rtems_score_HEADERS += include/rtems/score/timecounter.h
 include_rtems_score_HEADERS += include/rtems/score/timecounterimpl.h
 include_rtems_score_HEADERS += include/rtems/score/timespec.h
diff --git a/cpukit/include/rtems/score/threadqops.h b/cpukit/include/rtems/score/threadqops.h
new file mode 100644
index 0000000000..504383e98d
--- /dev/null
+++ b/cpukit/include/rtems/score/threadqops.h
@@ -0,0 +1,134 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/**
+ * @file
+ *
+ * @ingroup RTEMSScoreThreadQueue
+ *
+ * @brief This header file provides interfaces related to thread queue
+ *   operations.
+ */
+
+/*
+ * Copyright (C) 2021 embedded brains GmbH (http://www.embedded-brains.de)
+ *
+ * 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_THREADQOPS_H
+#define _RTEMS_SCORE_THREADQOPS_H
+
+#include <rtems/score/threadq.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @addtogroup RTEMSScoreThreadQueue
+ *
+ * @{
+ */
+
+/**
+ * @brief Initializes the priority actions so that no actions are performed.
+ *
+ * @param queue is unused.
+ *
+ * @param[out] priority_actions is initialized so that no actions are
+ *   performed.
+ */
+void _Thread_queue_Do_nothing_priority_actions(
+  Thread_queue_Queue *queue,
+  Priority_Actions   *priority_actions
+);
+
+/**
+ * @brief Enqueues the thread to the FIFO thread queue.
+ *
+ * @param[in, out] queue is the thread queue.
+ *
+ * @param[in, out] the_thread is the thread to enqueue.
+ *
+ * @param[in, out] queue_context is the thread queue context.
+ */
+void _Thread_queue_FIFO_enqueue(
+  Thread_queue_Queue   *queue,
+  Thread_Control       *the_thread,
+  Thread_queue_Context *queue_context
+);
+
+/**
+ * @brief Extracts the thread from the FIFO thread queue.
+ *
+ * @param[in, out] queue is the thread queue.
+ *
+ * @param[in, out] the_thread is the thread to extract.
+ *
+ * @param[in, out] queue_context is the thread queue context.
+ */
+void _Thread_queue_FIFO_extract(
+  Thread_queue_Queue   *queue,
+  Thread_Control       *the_thread,
+  Thread_queue_Context *queue_context
+);
+
+/**
+ * @brief Surrenders the thread queue to the first thread on the FIFO thread
+ *   queue.
+ *
+ * @param[in, out] queue is the thread queue.
+ *
+ * @param[in, out] heads are heads of the thread queue.
+ *
+ * @param previous_owner is unused.
+ *
+ * @param[in, out] queue_context is the thread queue context.
+ *
+ * @return Returns the first thread on the thread queue according to the queue
+ *   order.
+ */
+Thread_Control *_Thread_queue_FIFO_surrender(
+  Thread_queue_Queue   *queue,
+  Thread_queue_Heads   *heads,
+  Thread_Control       *previous_owner,
+  Thread_queue_Context *queue_context
+);
+
+/**
+ * @brief Gets the first thread on the FIFO thread queue.
+ *
+ * @param[in, out] queue is the thread queue.
+ *
+ * @param[in, out] the_thread is the thread to extract.
+ *
+ * @param[in, out] queue_context is the thread queue context.
+ */
+Thread_Control *_Thread_queue_FIFO_first( const Thread_queue_Heads *heads );
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTEMS_SCORE_THREADQOPS_H */
diff --git a/cpukit/score/src/threadqops.c b/cpukit/score/src/threadqops.c
index 42a771e86c..8c3e0cb1dc 100644
--- a/cpukit/score/src/threadqops.c
+++ b/cpukit/score/src/threadqops.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2016 embedded brains GmbH.  All rights reserved.
+ * Copyright (c) 2015, 2021 embedded brains GmbH.  All rights reserved.
  *
  *  embedded brains GmbH
  *  Dornierstr. 4
@@ -16,6 +16,7 @@
 #include "config.h"
 #endif
 
+#include <rtems/score/threadqops.h>
 #include <rtems/score/threadimpl.h>
 #include <rtems/score/assert.h>
 #include <rtems/score/chainimpl.h>
@@ -38,7 +39,7 @@
     Queue \
   )
 
-static void _Thread_queue_Do_nothing_priority_actions(
+void _Thread_queue_Do_nothing_priority_actions(
   Thread_queue_Queue *queue,
   Priority_Actions   *priority_actions
 )
@@ -187,7 +188,7 @@ static void _Thread_queue_FIFO_do_extract(
   _Chain_Extract_unprotected( &scheduler_node->Wait.Priority.Node.Node.Chain );
 }
 
-static void _Thread_queue_FIFO_enqueue(
+void _Thread_queue_FIFO_enqueue(
   Thread_queue_Queue   *queue,
   Thread_Control       *the_thread,
   Thread_queue_Context *queue_context
@@ -202,7 +203,7 @@ static void _Thread_queue_FIFO_enqueue(
   );
 }
 
-static void _Thread_queue_FIFO_extract(
+void _Thread_queue_FIFO_extract(
   Thread_queue_Queue   *queue,
   Thread_Control       *the_thread,
   Thread_queue_Context *queue_context
@@ -218,9 +219,7 @@ static void _Thread_queue_FIFO_extract(
   );
 }
 
-static Thread_Control *_Thread_queue_FIFO_first(
-  const Thread_queue_Heads *heads
-)
+Thread_Control *_Thread_queue_FIFO_first( const Thread_queue_Heads *heads )
 {
   const Chain_Control  *fifo;
   const Chain_Node     *first;
@@ -234,7 +233,7 @@ static Thread_Control *_Thread_queue_FIFO_first(
   return _Scheduler_Node_get_owner( scheduler_node );
 }
 
-static Thread_Control *_Thread_queue_FIFO_surrender(
+Thread_Control *_Thread_queue_FIFO_surrender(
   Thread_queue_Queue   *queue,
   Thread_queue_Heads   *heads,
   Thread_Control       *previous_owner,
@@ -243,6 +242,8 @@ static Thread_Control *_Thread_queue_FIFO_surrender(
 {
   Thread_Control *first;
 
+  (void) previous_owner;
+
   first = _Thread_queue_FIFO_first( heads );
   _Thread_queue_Queue_extract(
     queue,