3 ms·

I wonder, there was this change/fix: https://github.com/boostorg/sync/commit/1b5aaa4a0b7ef4fad2a46336a201081740e1c624#diff-3808384c88a5623a406c6b8073b76294dba8

• spacechild1 5y ago
  The title "Corrected memory order in some cases" is a bit misleading because the original code was correct. The commit just relaxes some unnecessarily strict memory orderings (to improve performance on platforms with weak memory models). BTW, the spinlock implementation is not affected.