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Code Editor : calculate-clock-offset.js
"use strict"; // This files implements the calculation of the offset between the global monotonic clock and UNIX time. This value is // known as |t1| in the calculation of "time origin timestamp" in the spec. This value needs to be calculated once and // can be used in all subsequent Performance instances. // // However, if the clock is not fast enough, the export is undefined to signify that we should use Date.now() to get the // time origin timestamp with millisecond accuracy, per spec. const { getGlobalMonotonicClockMS } = require("./global-monotonic-clock"); const clockIsAccurate = require("./clock-is-accurate"); // This function assumes the clock is accurate. function calculateClockOffset() { const start = Date.now(); let cur = start; // Limit the iterations, just in case we're running in an environment where Date.now() has been mocked and is // constant. for (let i = 0; i < 1e6 && cur === start; i++) { cur = Date.now(); } // At this point |cur| "just" became equal to the next millisecond -- the unseen digits after |cur| are approximately // all 0, and |cur| is the closest to the actual value of the UNIX time. Now, get the current global monotonic clock // value and do the remaining calculations. return cur - getGlobalMonotonicClockMS(); } if (clockIsAccurate) { // Warm up the function. calculateClockOffset(); calculateClockOffset(); calculateClockOffset(); module.exports = calculateClockOffset; } else { module.exports = undefined; }
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