Diff: rtos/Semaphore.h

Revision:

6:350b53afb889

Child:

8:88a1a9c26ae3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rtos/Semaphore.h	Fri Nov 23 09:57:31 2012 +0000
@@ -0,0 +1,40 @@
+/* Copyright (c) 2012 mbed.org */
+#ifndef SEMAPHORE_H
+#define SEMAPHORE_H 
+
+#include <stdint.h>
+#include "cmsis_os.h"
+
+namespace rtos {
+
+/*! 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(int32_t count);
+    
+    /*! Wait until a Semaphore resource becomes available. 
+      \param   millisec  timeout value or 0 in case of no time-out. (default: osWaitForever).
+      \return  number of available tokens, or -1 in case of incorrect parameters
+    */
+    int32_t wait(uint32_t millisec=osWaitForever);
+    
+    /*! Release a Semaphore resource that was obtain with Semaphore::wait.
+      \return  status code that indicates the execution status of the function. 
+    */
+    osStatus release(void);
+    
+    ~Semaphore();
+
+private:
+    osSemaphoreId _osSemaphoreId;
+    osSemaphoreDef_t _osSemaphoreDef;
+#ifdef CMSIS_OS_RTX
+    uint32_t _semaphore_data[2];
+#endif
+};
+
+}
+#endif