Diff: rtos/MemoryPool.h

Revision:

111:de54bc598ef1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rtos/MemoryPool.h	Fri Apr 29 14:04:02 2016 +0000
@@ -0,0 +1,82 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2012 ARM Limited
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef MEMORYPOOL_H
+#define MEMORYPOOL_H
+
+#include <stdint.h>
+#include <string.h>
+
+#include "cmsis_os.h"
+
+namespace rtos {
+
+/** Define and manage fixed-size memory pools of objects of a given type.
+  @tparam  T         data type of a single object (element).
+  @tparam  queue_sz  maximum number of objects (elements) in the memory pool.
+*/
+template<typename T, uint32_t pool_sz>
+class MemoryPool {
+public:
+    /** Create and Initialize a memory pool. */
+    MemoryPool() {
+    #ifdef CMSIS_OS_RTX
+        memset(_pool_m, 0, sizeof(_pool_m));
+        _pool_def.pool = _pool_m;
+
+        _pool_def.pool_sz = pool_sz;
+        _pool_def.item_sz =  sizeof(T);
+    #endif
+        _pool_id = osPoolCreate(&_pool_def);
+    }
+
+    /** Allocate a memory block of type T from a memory pool.
+      @return  address of the allocated memory block or NULL in case of no memory available.
+    */
+    T* alloc(void) {
+        return (T*)osPoolAlloc(_pool_id);
+    }
+
+    /** Allocate a memory block of type T from a memory pool and set memory block to zero.
+      @return  address of the allocated memory block or NULL in case of no memory available.
+    */
+    T* calloc(void) {
+        return (T*)osPoolCAlloc(_pool_id);
+    }
+
+    /** Return an allocated memory block back to a specific memory pool.
+      @param   address of the allocated memory block that is returned to the memory pool.
+      @return  status code that indicates the execution status of the function.
+    */
+    osStatus free(T *block) {
+        return osPoolFree(_pool_id, (void*)block);
+    }
+
+private:
+    osPoolId    _pool_id;
+    osPoolDef_t _pool_def;
+#ifdef CMSIS_OS_RTX
+    uint32_t    _pool_m[3+((sizeof(T)+3)/4)*(pool_sz)];
+#endif
+};
+
+}
+#endif