Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 | 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 26x 4x 4x 4x 3x 3x 3x 4x 26x 26x 26x 26x 26x 3x 3x 3x 2x 2x 2x 3x 26x 26x 26x 26x 26x 26x 26x 26x 17x 17x 17x 17x 17x 17x 17x 17x 3x 3x 3x 17x 17x 26x 26x | 'use strict';
const {
ReflectConstruct,
SafeMap,
Symbol,
} = primordials;
const {
codes: {
ERR_ILLEGAL_CONSTRUCTOR,
ERR_INVALID_THIS,
}
} = require('internal/errors');
const {
createELDHistogram,
} = internalBinding('performance');
const {
validateInteger,
validateObject,
} = require('internal/validators');
const {
Histogram,
kHandle,
kMap,
} = require('internal/histogram');
const {
kEmptyObject,
} = require('internal/util');
const {
makeTransferable,
} = require('internal/worker/js_transferable');
const kEnabled = Symbol('kEnabled');
class ELDHistogram extends Histogram {
constructor(i) {
throw new ERR_ILLEGAL_CONSTRUCTOR();
}
/**
* @returns {boolean}
*/
enable() {
if (this[kEnabled] === undefined)
throw new ERR_INVALID_THIS('ELDHistogram');
if (this[kEnabled]) return false;
this[kEnabled] = true;
this[kHandle].start();
return true;
}
/**
* @returns {boolean}
*/
disable() {
if (this[kEnabled] === undefined)
throw new ERR_INVALID_THIS('ELDHistogram');
if (!this[kEnabled]) return false;
this[kEnabled] = false;
this[kHandle].stop();
return true;
}
}
/**
* @param {{
* resolution : number
* }} [options]
* @returns {ELDHistogram}
*/
function monitorEventLoopDelay(options = kEmptyObject) {
validateObject(options, 'options');
const { resolution = 10 } = options;
validateInteger(resolution, 'options.resolution', 1);
return makeTransferable(ReflectConstruct(
function() {
this[kEnabled] = false;
this[kHandle] = createELDHistogram(resolution);
this[kMap] = new SafeMap();
}, [], ELDHistogram));
}
module.exports = monitorEventLoopDelay;
|