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The current isc_time_now uses CLOCK_REALTIME_COARSE which only updates on a timer tick. This clock is generally fine for millisecond accuracy, but on servers with 100hz clocks, this clock is nowhere near accurate enough for microsecond accuracy. This commit adds a new isc_time_now_hires function that uses CLOCK_REALTIME, which gives the current time, though it is somewhat expensive to call. When microsecond accuracy is required, it may be required to use extra resources for higher accuracy.
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