Function mprotect

cpp/src/arrow/io/mman.h:136–145

}

static inline int mprotect(void* addr, size_t len, int prot) {
  DWORD newProtect = __map_mmap_prot_page(prot);
  DWORD oldProtect = 0;

  if (VirtualProtect(addr, len, newProtect, &oldProtect)) return 0;

  errno = __map_mman_error(GetLastError(), EPERM);

  return -1;
}

static inline int msync(void* addr, size_t len, int flags) {
  if (FlushViewOfFile(addr, len)) return 0;