document why eintr.t needs to be skipped on Win32

diff --git a/t/io/eintr.t b/t/io/eintr.t
index e985a83..73eddeb 100644 (file)
--- a/t/io/eintr.t
+++ b/t/io/eintr.t
@@ -40,6 +40,9 @@ if (exists $ENV{PERLIO} && $ENV{PERLIO} =~ /stdio/  ) {
        exit 0;
 }
 
+# on Win32, alarm() won't interrupt the read/write call.
+# Similar issues with VMS.
+
 if ($^O eq 'VMS' || $^O eq 'MSWin32') {
        skip_all('various portability issues');
        exit 0;