forked from OSchip/llvm-project
8bec892713
Summary: In D27429, we switched the Apple implementation of steady_clock::now() from clock_gettime(CLOCK_MONOTONIC) to clock_gettime(CLOCK_UPTIME_RAW). The purpose was to get nanosecond precision, and also to improve the performance of the implementation. However, it appears that CLOCK_UPTIME_RAW does not satisfy the requirements of the Standard, since it is not strictly speaking monotonic. Indeed, the clock does not increment while the system is asleep, which had been mentioned in D27429 but somehow not addressed. This patch switches to CLOCK_MONOTONIC_RAW, which is monotonic, increased during sleep, and also has nanosecond precision. https://llvm.org/PR44773 Reviewers: bruno, howard.hinnant, EricWF Subscribers: christof, jkorous, dexonsmith, libcxx-commits, mclow.lists, EricWF Tags: #libc Differential Revision: https://reviews.llvm.org/D74341 |
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