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GeezerVison is showing github.com — async_hooks: move to lazy destroy hook registration in AsyncResource · nodejs/node@b632231

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benchmark/async_hooks
- gc-tracking.js
doc/api
- async_hooks.md
lib
- async_hooks.js

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`‎benchmark/async_hooks/gc-tracking.js‎`

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+10-1Lines changed: 10 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1,11 +1,12 @@`
`1`	`1`	`'use strict';`
`2`	`2`	`const common = require('../common.js');`
`3`		`-const { AsyncResource } = require('async_hooks');`
	`3`	`+const { createHook, AsyncResource } = require('async_hooks');`
`4`	`4`
`5`	`5`	`const bench = common.createBenchmark(main, {`
`6`	`6`	`n: [1e6],`
`7`	`7`	`method: [`
`8`	`8`	`'trackingEnabled',`
	`9`	`+ 'trackingEnabledWithDestroyHook',`
`9`	`10`	`'trackingDisabled',`
`10`	`11`	`]`
`11`	`12`	`}, {`
`@@ -30,6 +31,14 @@ function main({ n, method }) {`
`30`	`31`	`}`
`31`	`32`	`endAfterGC(n);`
`32`	`33`	`break;`
	`34`	`+ case 'trackingEnabledWithDestroyHook':`
	`35`	`+ createHook({ destroy: () => {} }).enable();`
	`36`	`+ bench.start();`
	`37`	`+ for (let i = 0; i < n; i++) {`
	`38`	`+ new AsyncResource('foobar');`
	`39`	`+ }`
	`40`	`+ endAfterGC(n);`
	`41`	`+ break;`
`33`	`42`	`case 'trackingDisabled':`
`34`	`43`	`bench.start();`
`35`	`44`	`for (let i = 0; i < n; i++) {`

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`‎doc/api/async_hooks.md‎`

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+2Lines changed: 2 additions & 0 deletions

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Original file line number	Diff line number	Diff line change
`@@ -685,6 +685,8 @@ asyncResource.triggerAsyncId();`
`685`	`685`	`when the object is garbage collected. This usually does not need to be set`
`686`	`686`	(even if `emitDestroy` is called manually), unless the resource's `asyncId`
`687`	`687`	is retrieved and the sensitive API's `emitDestroy` is called with it.
	`688`	+ When set to `false`, the `emitDestroy` call on garbage collection
	`689`	+ will only take place if there is at least one active `destroy` hook.
`688`	`690`	Default: `false`.
`689`	`691`
`690`	`692`	`Example usage:`

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`‎lib/async_hooks.js‎`

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+2-1Lines changed: 2 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -36,6 +36,7 @@ const {`
`36`	`36`	`emitDestroy,`
`37`	`37`	`enabledHooksExist,`
`38`	`38`	`initHooksExist,`
	`39`	`+ destroyHooksExist,`
`39`	`40`	`} = internal_async_hooks;`
`40`	`41`
`41`	`42`	`// Get symbols`
`@@ -168,7 +169,7 @@ class AsyncResource {`
`168`	`169`	`emitInit(asyncId, type, triggerAsyncId, this);`
`169`	`170`	`}`
`170`	`171`
`171`		`- if (!requireManualDestroy) {`
	`172`	`+ if (!requireManualDestroy && destroyHooksExist()) {`
`172`	`173`	`// This prop name (destroyed) has to be synchronized with C++`
`173`	`174`	`const destroyed = { destroyed: false };`
`174`	`175`	`this[destroyedSymbol] = destroyed;`

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