[macports-ports] branch master updated: legacy-support-devel: update to 20230424 commit - Add optimization for clock_gettime: cache_timebase - See: https://github.com/macports/macports-legacy-support/pull/52

Christopher Nielsen mascguy at macports.org
Mon Apr 24 21:33:31 UTC 2023

Previous message (by thread): [macports-legacy-support] branch master updated: clock_gettime: cache timebase - On versions of osx before 10.12, mach_timebase_info is a direct syscall (see dyld-239.3/glue.c#L434) which is order of magnitudes slower than the subsequent mach_absolute_time() call. Hence it's better to just cache it after the first call. - Since 10.12+, Apple also realized this and began caching mach_timebase_info calls at the libc layer (https://opensource.apple.com/source/xnu/xnu-3789.41.3/libsyscall/wrappers/mach_timebase_info.c.auto.html)
Next message (by thread): [macports-legacy-support] branch master updated: clock_gettime: fix const issue with cache timebase optimization - Rounding logic updates variable 'tdiff' if necessary, so it can't be a const - See: https://github.com/macports/macports-legacy-support/pull/52
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