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

components/libc/cplusplus/cxx_semaphore.h

@@ -0,0 +1,42 @@
+/*
+ * 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 <rtthread.h>
+
+namespace rtthread {
+
+/** The Semaphore class is used to manage and protect access to a set of shared resources. */
+class Semaphore
+{
+public:
+    /** Create and Initialize a Semaphore object used for managing resources.
+      @param number of available resources; maximum index value is (count-1).
+    */
+    Semaphore(const char *name = "sem", int32_t count = 0);
+    ~Semaphore();
+
+    /** Wait until a Semaphore resource becomes available.
+      @param   millisec  timeout value or 0 in case of no time-out.
+      @return  true on success.
+    */
+    bool wait(int32_t millisec = -1);
+
+    /** Release a Semaphore resource that was obtain with Semaphore::wait.
+    */
+    void release(void);
+
+private:
+    struct rt_semaphore mID;
+};
+
+}