typedef enum _XMEM_OPTIONS    
{  
    eXMEMOPT_VALIDATE_XMEMALLOC = 0x1,  
    eXMEMOPT_XMEMALLOCDEFAULT_TAG_VIRTUALALLOC = 0x2,  
    eXMEMOPT_RAISE_HEAPFREE_CALLBACK_ON_REALLOC = 0x3,  
    eXMEMOPT_XMEMALLOCDEFAULT_DISABLEPAGESIZEDEMOTION = 0x4,  
    eXMEMOPT_XMEMALLOCDEFAULT_TRAPUSEAFTERFREE = 0x5,  
    eXMEMOPT_XMEMALLOCDEFAULT_USE64KPAGES = 0x6,
    eXMEMOPT_ALLOW_WRITEABLE_FILEMAPPINGS = 0x7,
    eXMEMOPT_MAX = 0xFFFF,
} XMEM_OPTIONS