Skip to content

Commit

Permalink
worker: drain messages from internal message port
Browse files Browse the repository at this point in the history
When the worker thread exits, drain the messages also from the internal
message port so that the call to 'kDispose' will occur only after all
the messages from the worker were processed in the parent, so stdio
messages from the worker will be successfully pushed to their target
streams in the parent.

PR-URL: #24932
Fixes: #24636
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
  • Loading branch information
yaelhe authored and BethGriggs committed Dec 17, 2018
1 parent f854701 commit 331f604
Show file tree
Hide file tree
Showing 2 changed files with 42 additions and 0 deletions.
1 change: 1 addition & 0 deletions lib/internal/worker.js
Original file line number Diff line number Diff line change
Expand Up @@ -317,6 +317,7 @@ class Worker extends EventEmitter {
[kOnExit](code) {
debug(`[${threadId}] hears end event for Worker ${this.threadId}`);
MessagePortPrototype.drain.call(this[kPublicPort]);
MessagePortPrototype.drain.call(this[kPort]);
this[kDispose]();
this.emit('exit', code);
this.removeAllListeners();
Expand Down
41 changes: 41 additions & 0 deletions test/parallel/test-worker-message-port-drain.js
Original file line number Diff line number Diff line change
@@ -0,0 +1,41 @@
// Flags: --experimental-worker
'use strict';
require('../common');

// This test ensures that the messages from the internal
// message port are drained before the call to 'kDispose',
// and so all the stdio messages from the worker are processed
// in the parent and are pushed to their target streams.

const assert = require('assert');
const {
Worker,
isMainThread,
parentPort,
threadId,
} = require('worker_threads');

if (isMainThread) {
const workerIdsToOutput = new Map();

for (let i = 0; i < 2; i++) {
const worker = new Worker(__filename, { stdout: true });
const workerOutput = [];
workerIdsToOutput.set(worker.threadId, workerOutput);
worker.on('message', console.log);
worker.stdout.on('data', (chunk) => {
workerOutput.push(chunk.toString().trim());
});
}

process.on('exit', () => {
for (const [threadId, workerOutput] of workerIdsToOutput) {
assert.ok(workerOutput.includes(`1 threadId: ${threadId}`));
assert.ok(workerOutput.includes(`2 threadId: ${threadId}`));
}
});
} else {
console.log(`1 threadId: ${threadId}`);
console.log(`2 threadId: ${threadId}`);
parentPort.postMessage(Array(100).fill(1));
}

0 comments on commit 331f604

Please sign in to comment.