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async_hooks: move to lazy destroy hook registration in AsyncResource
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PR-URL: #32429
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: Vladimir de Turckheim <vlad2t@hotmail.com>
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puzpuzpuz authored and targos committed Apr 11, 2020
1 parent 135f4b9 commit b632231
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Showing 3 changed files with 14 additions and 2 deletions.
11 changes: 10 additions & 1 deletion benchmark/async_hooks/gc-tracking.js
Original file line number Diff line number Diff line change
@@ -1,11 +1,12 @@
'use strict';
const common = require('../common.js');
const { AsyncResource } = require('async_hooks');
const { createHook, AsyncResource } = require('async_hooks');

const bench = common.createBenchmark(main, {
n: [1e6],
method: [
'trackingEnabled',
'trackingEnabledWithDestroyHook',
'trackingDisabled',
]
}, {
Expand All @@ -30,6 +31,14 @@ function main({ n, method }) {
}
endAfterGC(n);
break;
case 'trackingEnabledWithDestroyHook':
createHook({ destroy: () => {} }).enable();
bench.start();
for (let i = 0; i < n; i++) {
new AsyncResource('foobar');
}
endAfterGC(n);
break;
case 'trackingDisabled':
bench.start();
for (let i = 0; i < n; i++) {
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2 changes: 2 additions & 0 deletions doc/api/async_hooks.md
Original file line number Diff line number Diff line change
Expand Up @@ -685,6 +685,8 @@ asyncResource.triggerAsyncId();
when the object is garbage collected. This usually does not need to be set
(even if `emitDestroy` is called manually), unless the resource's `asyncId`
is retrieved and the sensitive API's `emitDestroy` is called with it.
When set to `false`, the `emitDestroy` call on garbage collection
will only take place if there is at least one active `destroy` hook.
**Default:** `false`.

Example usage:
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3 changes: 2 additions & 1 deletion lib/async_hooks.js
Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,7 @@ const {
emitDestroy,
enabledHooksExist,
initHooksExist,
destroyHooksExist,
} = internal_async_hooks;

// Get symbols
Expand Down Expand Up @@ -168,7 +169,7 @@ class AsyncResource {
emitInit(asyncId, type, triggerAsyncId, this);
}

if (!requireManualDestroy) {
if (!requireManualDestroy && destroyHooksExist()) {
// This prop name (destroyed) has to be synchronized with C++
const destroyed = { destroyed: false };
this[destroyedSymbol] = destroyed;
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