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external/CMSIS_5/CMSIS/RTOS/Template/CPP/Mutex.h

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+/* Copyright (c) 2012 mbed.org */
+#ifndef MUTEX_H
+#define MUTEX_H 
+
+#include <stdint.h>
+#include "cmsis_os.h"
+
+namespace rtos {
+
+/*! The Mutex class is used to synchronise the execution of threads.
+ This is for example used to protect access to a shared resource.
+*/
+class Mutex {
+public:
+    /*! Create and Initialize a Mutex object */
+    Mutex();
+    
+    /*! Wait until a Mutex becomes available.
+      \param   millisec  timeout value or 0 in case of no time-out. (default: osWaitForever)
+      \return  status code that indicates the execution status of the function.
+     */ 
+    osStatus lock(uint32_t millisec=osWaitForever);
+    
+    /*! Try to lock the mutex, and return immediately
+      \return  true if the mutex was acquired, false otherwise.
+     */
+    bool trylock();
+    
+    /*! Unlock the mutex that has previously been locked by the same thread
+      \return  status code that indicates the execution status of the function. 
+     */
+    osStatus unlock();
+
+private:
+    osMutexId _osMutexId;
+    osMutexDef_t _osMutexDef;
+#ifdef CMSIS_OS_RTX
+    int32_t _mutex_data[3];
+#endif
+};
+
+}
+#endif