The code in question has been modified in more recent versions of Time-HiRes, for example, to use PERL_DARWIN_MUTEX. Are these changes sufficient? http://perl5.git.perl.org/perl.git/commitdiff/c4a535af41823cc84534bf8dbecfdcc3eb7daa86 If not, the patch from Misty may have been overwritten when the new version of Time-HiRes was brought into blead (is it cpan-upstream?). Jarkko, have you had a chance to look into the issues you identified? -- Dan CollinsThread Previous