vm: use FILE_READ_ATTRIBUTES to make exists? faster.

diff --git a/vm/os-windows.cpp b/vm/os-windows.cpp
index d6b74888c203d2e5b861f957dde8e35070472e27..a5df4dc8647b56b5b2a69b705ec69494897317ce 100644 (file)
--- a/vm/os-windows.cpp
+++ b/vm/os-windows.cpp
@@ -37,15 +37,14 @@ void factor_vm::ffi_dlclose(dll* dll) {
 
 BOOL factor_vm::windows_stat(vm_char* path) {
   BY_HANDLE_FILE_INFORMATION bhfi;
-  HANDLE h = CreateFileW(path, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
+  HANDLE h = CreateFileW(path, FILE_READ_ATTRIBUTES, 0, NULL,
                          OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
 
   if (h == INVALID_HANDLE_VALUE) {
     // FindFirstFile is the only call that can stat c:\pagefile.sys
     WIN32_FIND_DATA st;
-    HANDLE h;
-
-    if (INVALID_HANDLE_VALUE == (h = FindFirstFile(path, &st)))
+    h = FindFirstFile(path, &st);
+    if (h == INVALID_HANDLE_VALUE)
       return false;
     FindClose(h);
     return true;