file_load_ok_v2.patch

diff --git a/file.c b/file.c
index e566ce3..24b25b8 100644
--- a/file.c
+++ b/file.c
@@ -5060,7 +5060,38 @@ static int
 file_load_ok(const char *path)
 {
     int ret = 1;
-    int fd = open(path, O_RDONLY);
+    int fd;
+#ifdef _WIN32
+    static int use_attribute = -1;
+    if (use_attribute == -1) {
+	if (getenv("RUBY_USE_ATTRIBUTE") == NULL) {
+	    use_attribute = 0;
+	}
+	else {
+	    use_attribute = 1;
+	}
+    }
+    if (use_attribute) {
+	DWORD attr = GetFileAttributes(path);
+	if (attr == INVALID_FILE_ATTRIBUTES ||
+	    attr & FILE_ATTRIBUTE_DIRECTORY) {
+	    ret = 0;
+	}
+	else {
+	    HANDLE h = CreateFile(path, GENERIC_READ,
+			FILE_SHARE_READ | FILE_SHARE_WRITE,
+			NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+	    if (h != INVALID_HANDLE_VALUE) {
+		CloseHandle(h);
+	    }
+	    else {
+		ret = 0;
+	    }
+	}
+	return ret;
+    }
+#endif
+    fd = open(path, O_RDONLY);
     if (fd == -1) return 0;
     rb_update_max_fd(fd);
 #if !defined DOSISH

Benchmark on Windows XP
fenix enabled

# NOD32 realtime file system protection ON

[C:\devruby\measurements]set RUBY_USE_ATTRIBUTE=

[C:\devruby\measurements]rci bench core_require_empty
ruby 1.9.3p5 (2011-11-30) [i386-mingw32]
Rehearsal ------------------------------------------------------
core_require_empty   0.453000  12.406000  12.859000 ( 13.578125)
-------------------------------------------- total: 12.859000sec

                         user     system      total        real
core_require_empty   0.578000  12.172000  12.750000 ( 13.562500)

[C:\devruby\measurements]set RUBY_USE_ATTRIBUTE=1

[C:\devruby\measurements]rci bench core_require_empty
ruby 1.9.3p5 (2011-11-30) [i386-mingw32]
Rehearsal ------------------------------------------------------
core_require_empty   0.516000   3.641000   4.157000 (  4.859375)
--------------------------------------------- total: 4.157000sec

                         user     system      total        real
core_require_empty   0.484000   3.656000   4.140000 (  4.859375)


# NOD32 realtime file system protection OFF

[C:\devruby\measurements]set RUBY_USE_ATTRIBUTE=

[C:\devruby\measurements]rci bench core_require_empty
ruby 1.9.3p5 (2011-11-30) [i386-mingw32]
Rehearsal ------------------------------------------------------
core_require_empty   0.594000   3.344000   3.938000 (  4.125000)
--------------------------------------------- total: 3.938000sec

                         user     system      total        real
core_require_empty   0.547000   3.531000   4.078000 (  4.140625)

[C:\devruby\measurements]set RUBY_USE_ATTRIBUTE=1

[C:\devruby\measurements]rci bench core_require_empty
ruby 1.9.3p5 (2011-11-30) [i386-mingw32]
Rehearsal ------------------------------------------------------
core_require_empty   0.500000   1.938000   2.438000 (  2.640625)
--------------------------------------------- total: 2.438000sec

                         user     system      total        real
core_require_empty   0.406000   2.109000   2.515000 (  2.625000)