import RT-Thread@9217865c without bsp, libcpu and components/net

components/libc/cplusplus/cxx_mail.h

@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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 Mail class allow to control, send, receive, or wait for mail.
+ * A mail is a memory block 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 Mail {
+public:
+    /** Create and Initialise Mail queue. */
+    Mail(const char *name = "")
+    {
+        rt_mb_init(&mID, name, mPool, queue_sz, RT_IPC_FLAG_FIFO);
+    }
+
+    ~Mail()
+    {
+        rt_mb_detach(&mID);
+    }
+
+    /** Put a mail in the queue.
+      @param   mptr  memory block previously allocated with Mail::alloc or Mail::calloc.
+      @return  status code that indicates the execution status of the function.
+    */
+    bool put(T *mptr, int32_t millisec = 0)
+    {
+        rt_int32_t tick;
+
+        if (millisec < 0)
+            tick = -1;
+        else
+            tick = rt_tick_from_millisecond(millisec);
+
+        return rt_mb_send_wait(&mID, (rt_ubase_t)mptr, tick) == RT_EOK;
+    }
+
+    /** Get a mail from a queue.
+      @param   millisec  timeout value or 0 in case of no time-out. (default: osWaitForever).
+      @return  event that contains mail information or error code.
+    */
+    T* get(int32_t millisec = -1)
+    {
+        T *t = NULL;
+        rt_int32_t tick;
+
+        if (millisec < 0)
+            tick = -1;
+        else
+            tick = rt_tick_from_millisecond(millisec);
+
+        rt_mb_recv(&mID, &t, tick);
+
+        return t;
+    }
+
+private:
+    struct rt_mailbox mID;
+    T* mPool[queue_sz];
+};
+
+}