Flush memory cache

C++ code to do some sort of low-level memory operation in Windows.

{
  MEMORYSTATUS stat = {0};
  GlobalMemoryStatus (&stat);
  VOID* mem = VirtualAlloc (0,stat.dwAvailPhys,
    MEM_COMMIT,
    PAGE_READWRITE);

  // req to really alloc the pages
  memset (mem,0,stat.dwAvailPhys);
  VirtualFree (mem,0,MEM_RELEASE);
}