tor/changes/feature24427

  o Minor features (OSX, iOS, performance):
    - Use the mach_approximate_time() function (when available) to
      implement coarse monotonic time. Having a coarse time function
      should avoid a large number of system calls, and improve
      performance slightly, especially under load. Closes ticket 24427.
Use mach_approximate_time() for coarse time where available. This lets us have a coarse-time implementation with reasonable performance characteristics on OSX and iOS. Implements 24427. 2017-12-08 15:24:02 +01:00			`o Minor features (OSX, iOS, performance):`
			`- Use the mach_approximate_time() function (when available) to`
			`implement coarse monotonic time. Having a coarse time function`
			`should avoid a large number of system calls, and improve`
			`performance slightly, especially under load. Closes ticket 24427.`