text: /* 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
  