#include<SylixOS.h>

LW_OBJECT_HANDLE  Lw_Partition_Create(CPCHAR             pcName,

                                          PVOID              pvLowAddr,

                                          ULONG              ulBlockCounter,

                                          size_t             stBlockByteSize,

                                          ULONG              ulOption,

                                          LW_OBJECT_ID      *pulId)

选项名称

解释

LW_OPTION_OBJECT_GLOBAL

表示该对象为一个内核全局对象

LW_OPTION_OBJECT_LOCAL

表示该对象仅为一个进程拥有，即本地对象

LW_OPTION_DEFAULT

默认选项

/**********************************************************************************

  PARTITION 控制块

**********************************************************************************/

typedefstruct {

    LW_LIST_MONO         PARTITION_monoResrcList;         /*  空闲资源表             */

    UINT8                PARTITION_ucType;                 /*  类型标志               */

    PLW_LIST_MONO        PARTITION_pmonoFreeBlockList;   /*  空闲内存块表           */

    size_t               PARTITION_stBlockByteSize;       /*  每一块的大小           */

                                                             /*  必须大于 sizeof(PVOID)*/

    ULONG                PARTITION_ulBlockCounter;        /*  块数量                 */

    ULONG                PARTITION_ulFreeBlockCounter;    /*  空闲块数量             */

    UINT16               PARTITION_usIndex;                /*  缓冲区索引             */ 

    CHAR                 PARTITION_cPatitionName[LW_CFG_OBJECT_NAME_SIZE];

                                                              /*  名字                   */

    LW_SPINLOCK_DEFINE  (PARTITION_slLock);              /*  自旋锁                 */

} LW_CLASS_PARTITION;

PVOID  Lw_Partition_Get (LW_OBJECT_HANDLE  ulId)

PVOID  Lw_Partition_Put (LW_OBJECT_HANDLE  ulId, PVOID  pvBlock)

ULONG  Lw_Partition_Delete (LW_OBJECT_HANDLE   *pulId)

ULONG  Lw_Partition_DeleteEx (LW_OBJECT_HANDLE   *pulId, BOOL  bForce)

Lw_Partition_DeleteEx(pulId, LW_FALSE);

#include<stdio.h>

#include<SylixOS.h>

typedefstruct my_element {

    INTiValue;

} MY_ELEMENET;

#define    ELEMENT_MAX (8)

/*

 * 即当_G_pucMyElementPool 的地址不满足结构体 MY_ELEMENT 的对齐需求时，在有些硬件上，

 * 访问成员变量 iValue 将产生多字节不对齐访问的错误（典型的硬件平台如 ARM）。

* 应该将_G_pucMyElementPool 的类型定义为UINT8，即单字节访问，逻辑上它的起始地址可以是任  * 何对齐值。

 */

MY_ELEMENET_G_pmyelement[ELEMENT_MAX];

LW_STACK    _G_pucMyElementPool[sizeof(MY_ELEMENET) * ELEMENT_MAX /

                                   sizeof(LW_STACK)];        /*  申请一段内存空间     */

LW_HANDLE    _G_hMyPartition;                                /*  内存管理句柄         */                         

intmain(intargc, char *argv[])

{

    MY_ELEMENET *peleTable[ELEMENT_MAX]   = { LW_NULL };

    MY_ELEMENET *peleTmp                  = NULL;

    ULONG         ulError;

    INT           i                       = 0;

    _G_hMyPartition = Lw_Partition_Create("my_partition", _G_pucMyElementPool,

                                          ELEMENT_MAX, sizeof(MY_ELEMENET),

                                                LW_OPTION_DEFAULT,

                                                LW_NULL);

    if (_G_hMyPartition == LW_HANDLE_INVALID) {

        fprintf(stderr, "create partition failed. ");

        return (-1);

    }

    /*

     * 最多能够获得多少个元素内存

     */

    while (1) {

        peleTmp = (MY_ELEMENET *) Lw_Partition_Get(_G_hMyPartition);

        if (peleTmp != LW_NULL) {

            peleTable[i] = peleTmp;

            peleTmp->iValue = i;

            fprintf(stdout, "get element successfully, count = %d. ", i);

        } else {

            fprintf(stderr, "get element failed, count = %d. ", i);

            break;

        }

        i++;

    }

    /*

     * 在没有全部回收元素内存的情况下删除内存分区

     */

ulError = Lw_Partition_Delete(&_G_hMyPartition); /*无法删除还有未回收所有内存*/

    if (ulError != ERROR_NONE) {

        fprintf(stderr, "delete partition error. ");

    } else {

        return (0);

    }

    /*

     * 回收内存块返回给内存分区

     */

    for (i = 0; i < ELEMENT_MAX; i++) {

        peleTmp = peleTable[i];

        if (peleTmp != LW_NULL) {

            fprintf(stdout, "element%d value = %d. ", i, peleTmp->iValue);

            peleTmp = Lw_Partition_Put(_G_hMyPartition, peleTmp);

            if (peleTmp != LW_NULL) {

                fprintf(stderr, "element%d put failed. ", i);

            }

        } else {

            break;

        }

    }

    /*

     * 全部回收元素内存后删除内存分区

     */

    ulError = Lw_Partition_Delete(&_G_hMyPartition); /*   可以删除内存分区           */

    if (ulError != ERROR_NONE) {

        fprintf(stderr, "delete partition error. ");

        return (-1);

    } else {

        fprintf(stderr, "delete partition successfully. ");

    }

    return (0);

}