getmaxMALLOC.c

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/*-----------------------------------------------------------------------------------*/
/* INRIA 2006 */
/* Allan CORNET */
/*-----------------------------------------------------------------------------------*/ 
#ifdef _MSC_VER
        #include <Windows.h>
#else
        #include <sys/resource.h>
#endif
#include "../includes/getmaxMALLOC.h"
/*-----------------------------------------------------------------------------------*/ 
#ifdef _MSC_VER
IMPORT_EXPORT_MALLOC_DLL unsigned long GetLargestFreeMemoryRegion(void)
{
        SYSTEM_INFO systemInfo;
        VOID *p = 0;
        MEMORY_BASIC_INFORMATION mbi;
        unsigned long largestSize = 0;

        GetSystemInfo(&systemInfo);

        while(p < systemInfo.lpMaximumApplicationAddress)
        {
                SIZE_T dwRet = VirtualQuery(p, &mbi, sizeof(mbi));
                if (dwRet > 0)
                {
                        if (mbi.State == MEM_FREE)
                        {
                                if (largestSize < mbi.RegionSize)
                                {
                                        largestSize = (unsigned long) mbi.RegionSize;
                                }
                        }
                        p = (void*) (((char*)p) + mbi.RegionSize);
                }
                else
                {
                        p = (void*) (((char*)p) + systemInfo.dwPageSize);
                }
        }
        return largestSize;
}
/*-----------------------------------------------------------------------------------*/
#else
IMPORT_EXPORT_MALLOC_DLL unsigned long GetLargestFreeMemoryRegion(void)
{
        struct rlimit rlim;
        unsigned long largestSize = 0;

        /* HP-UX Use RLIMIT_AIO_MEM instead of RLIMIT_MEMLOCK */
#ifdef solaris
getrlimit(RLIMIT_VMEM,&rlim);
#else   
getrlimit(RLIMIT_MEMLOCK, &rlim);
#endif
        largestSize = rlim.rlim_max;

        return largestSize;
}
#endif
/*-----------------------------------------------------------------------------------*/

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