https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61333
--- Comment #6 from Jack Howarth <howarth.at.gcc at gmail dot com> --- There is a call to pthread_cond_timedwait() in the libiomp5 implementation but I don't see any such calls in libgomp. Perhaps this is the related to the increased performance in libiomp5 on darwin?