Import Mbed OS hard-float snapshot

UNITTESTS/target_h/rtos/Semaphore.h

@@ -0,0 +1,42 @@
+/* Copyright (c) 2019 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SEMAPHORE_H
+#define SEMAPHORE_H
+
+#include <stdint.h>
+#include "cmsis_os2.h"
+#include "rtos/Kernel.h"
+
+namespace rtos {
+class Semaphore  {
+public:
+    Semaphore(int32_t count = 0);
+    Semaphore(int32_t count, uint16_t max_count);
+    void acquire();
+    bool try_acquire();
+    bool try_acquire_for(uint32_t millisec);
+    bool try_acquire_for(Kernel::Clock::duration_u32 rel_time);
+    bool try_acquire_until(uint64_t millisec);
+    bool try_acquire_until(Kernel::Clock::time_point abs_time);
+    osStatus release(void);
+    ~Semaphore();
+private:
+    void constructor(int32_t count, uint16_t max_count);
+};
+}
+
+#endif