exstbmemfree.c

用于嵌入式linux下memory的占用情况,很有用.

/*****************************************************************************/
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/*
                                  IPSTB Project
                         ---------------------------------

Filename: exStbMemFree.c


Rev Date       Author      Comments
--------------------------------------------------------------------------------
  1 20070726   neill       Original
  2 20071023   neill       Fix QAC errors
  3 20080205   batelaan    Update file copyright/license text

*/

/** @file
    Simple program to test the available free memory.
*/

/***********************************************
* INCLUDE FILES                                *
************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>

/***********************************************
* LOCAL MACROS                                 *
************************************************/

/* Size of memory chunks to be malloced */
#define MEM_TEST_SIZE (512*1024)

/******************************************************************
* LOCAL TYPEDEFS                                                  *
*******************************************************************/

/* Structure used to create linked list */
typedef struct _memTestStruct
{
    struct _memTestStruct* pNext;
}memTestStruct;

/*****************************
* STATIC FUNCTION PROTOTYPES *
******************************/

/*****************************
* STATIC DATA                *
******************************/

/*****************************
* EXPORTED DATA              *
******************************/

/*****************************
* FUNCTION IMPLEMENTATION    *
******************************/

int32_t main(int32_t argc, char* argv[])
{
    int32_t total = 0;

    /* Linked listed used to track the memory */
    memTestStruct *ptr = NULL;

    while(1)
    {
        memTestStruct * pTmp;

        /* Allocate a chunk of memory */
        pTmp = (memTestStruct *) malloc(MEM_TEST_SIZE);

        if (!pTmp)
        {
            break;
        }
        /* Access ALL of it! */
        (void)memset((char*)pTmp, 0, MEM_TEST_SIZE);

        /* Increment the total allocated size */
        total += MEM_TEST_SIZE;
        (void)printf("Malloced %.1f MB\n", ((float)total/(float)(1024*1024)));

        /* Save the memory into a linked list */
        pTmp->pNext = ptr;
        ptr = pTmp;
    }

    /* Free off all the memory */
    while(ptr != NULL)
    {
        memTestStruct * pTmp;
        pTmp = ptr->pNext;

        free(ptr);

        ptr = pTmp;
    }

    return 0;
}