[C++] Add C++ interface for RT-Thread kernel.

components/cplusplus/Queue.h

@@ -0,0 +1,88 @@
+/*
+ * File      : Queue.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2016, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2016/10/1      Bernard      The first version
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <string.h>
+
+#include <rtthread.h>
+
+namespace rtthread {
+
+/**
+ * The Queue class allow to control, send, receive, or wait for messages.
+ * A message can be a integer or pointer value  to a certain type T that is send
+ * to a thread or interrupt service routine.
+ * @param  T         data type of a single message element.
+ * @param  queue_sz  maximum number of messages in queue.
+ */
+template<typename T, uint32_t queue_sz>
+class Queue
+{
+public:
+    /** Create and initialise a message Queue. */
+    Queue()
+    {
+        rt_mq_init(&mID, "mq", mPool, sizeof(T), sizeof(mPool), RT_IPC_FLAG_FIFO);
+    };
+
+    ~Queue()
+    {
+        rt_mq_detach(&mID);
+    };
+
+    /** Put a message in a Queue.
+      @param   data      message pointer.
+      @param   millisec  timeout value or 0 in case of no time-out. (default: 0)
+      @return  status code that indicates the execution status of the function.
+    */
+    rt_err_t put(T& data, int32_t millisec = 0)
+    {
+        return rt_mq_send(&mID, &data, sizeof(data));
+    }
+
+    /** Get a message or Wait for a message from a Queue.
+      @param   millisec  timeout value or 0 in case of no time-out. (default: osWaitForever).
+      @return  bool .
+    */
+    bool get(T& data, int32_t millisec = WAIT_FOREVER)
+    {
+        rt_int32_t tick;
+
+        if (millisec < 0)
+            tick = -1;
+        else
+            tick = rt_tick_from_millisecond(millisec);
+
+        return rt_mq_recv(&mID, &data, sizeof(data), tick) == RT_EOK;
+    }
+
+private:
+    struct rt_messagequeue mID;
+
+    char mPool[(sizeof(struct rt_messagequeue)+sizeof(T)) * queue_sz];
+};
+
+}