1 files changed, 6 insertions, 0 deletions
diff --git a/win32/win32.c b/win32/win32.c
index 3b935b1d36..f0e587b865 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -559,6 +559,12 @@ init_env(void)
 typedef BOOL (WINAPI *cancel_io_t)(HANDLE);
 static cancel_io_t cancel_io = NULL;
 
+int
+rb_w32_has_cancel_io(void)
+{
+    return cancel_io != NULL;
+}
+
 static void
 init_func(void)
 {