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async_hooks: lazy loading for startup performance

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PR-URL: https://github.com/nodejs/node/pull/20567
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
This commit is contained in:
Ruben Bridgewater 2018-05-07 04:25:26 +02:00
parent 17d95ea1f0
commit a3a14082fc
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GPG Key ID: F07496B3EB3C1762
1 changed files with 35 additions and 27 deletions
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18
lib/internal/inspector_async_hook.js
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@ -1,15 +1,20 @@
'use strict';
const { createHook } = require('async_hooks');
const inspector = process.binding('inspector');
const config = process.binding('config');
if (!inspector || !inspector.asyncTaskScheduled) {
exports.setup = function() {};
return;
}
const hook = createHook({
let hook;
let config;
function lazyHookCreation() {
const { createHook } = require('async_hooks');
config = process.binding('config');
hook = createHook({
init(asyncId, type, triggerAsyncId, resource) {
// It's difficult to tell which tasks will be recurring and which won't,
// therefore we mark all tasks as recurring. Based on the discussion
@ -39,11 +44,13 @@ const hook = createHook({
return this.promiseIds.delete(asyncId);
inspector.asyncTaskCanceled(asyncId);
},
});
});
hook.promiseIds = new Set();
hook.promiseIds = new Set();
}
function enable() {
if (hook === undefined) lazyHookCreation();
if (config.bits < 64) {
// V8 Inspector stores task ids as (void*) pointers.
// async_hooks store ids as 64bit numbers.
@ -61,6 +68,7 @@ function enable() {
}
function disable() {
if (hook === undefined) lazyHookCreation();
hook.disable();
}