[cpp] support rt-thread CPP wrapper sub-switch macros

components/libc/cplusplus/os/cxx_Semaphore.cpp

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+
+#include "cxx_semaphore.h"
+
+using namespace rtthread;
+
+Semaphore::Semaphore(const char *name, int32_t count)
+{
+    rt_sem_init(&mID, name, count, RT_IPC_FLAG_FIFO);
+}
+
+bool Semaphore::wait(int32_t millisec)
+{
+    rt_int32_t tick;
+
+    if (millisec < 0)
+        tick = -1;
+    else
+        tick = rt_tick_from_millisecond(millisec);
+
+    return rt_sem_take(&mID, tick) == RT_EOK;
+}
+
+void Semaphore::release(void)
+{
+    rt_sem_release(&mID);
+}
+
+Semaphore::~Semaphore()
+{
+    rt_sem_detach(&mID);
+}