MessagePort can send messages after closed

Version

v17.7.1

Platform

Linux 5.13.0-30-generic #33~20.04.1-Ubuntu SMP Mon Feb 7 14:25:10 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

Subsystem

worker_threads

What steps will reproduce the bug?

const { MessageChannel } = require('worker_threads');

const ch = new MessageChannel()

ch.port1.onmessage = () => console.log('hey');

ch.port2.close();

ch.port2.postMessage('asdf');

How often does it reproduce? Is there a required condition?

Consistently in v17.7.1, v16.14.0 and v14.19.0.

What is the expected behavior?

The program should not log anything, since port2 is closed right before the call to postMessage.

What do you see instead?

The program does log hey.

Additional information

For whatever is worth, both in Chrome (Chromium 98.0.4758.102, V8 9.8.177.11) and Firefox (97.0.2), the message never arrives.

@jrvidal

Hi @jrvidal

In this case the method ch.port2.close() has not been completely closed when the code calls ch.port2.postMessage('asdf').

If you execute the next code you can see the log 'hey' has shown before than log 'close'.

const { MessageChannel } = require('worker_threads');
const { port1, port2 } = new MessageChannel();

port1.onmessage = () => console.log('hey');
port2.on('close', () => console.log('fechou'));

port2.close();
port2.postMessage('asdf');

You can see this docs on https://nodejs.org/api/worker_threads.html#portclose.

You can see this docs on https://nodejs.org/api/worker_threads.html#portclose.

Thanks, the docs are somewhat ambiguous about this point, that's why I reported.

I think it'd be desirable to more closely align with browsers here, or at least be more explicit about this behavior in the documentation.

#42357 aligns the behavior with the expectations described here and the behavior described for Chrome and Firefox.

@Trott

@Trott Thanks for that PR! Any intent to backport to 16.x?

Any intent to backport to 16.x?

Node.js v16.x is on Active LTS mode; unless a git conflict arises, it should be backported "automatically" after the adequate maturation delay, see

node/doc/contributing/backporting-to-release-lines.md

Lines 22 to 25 in a199387

    
           what can be landed. Our LTS release lines (see the [Release Plan][]) 
        
           require that commits mature in the Current release for at least 2 weeks before 
        
           they can be landed in an LTS staging branch. Only after "maturation" will those 
        
           commits be cherry-picked or backported.

worker: do not send message if port is closing

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MessagePort can send messages after closed #42296

Version

Platform

Subsystem

What steps will reproduce the bug?

How often does it reproduce? Is there a required condition?

What is the expected behavior?

What do you see instead?

Additional information

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	what can be landed. Our LTS release lines (see the [Release Plan][])
	require that commits mature in the Current release for at least 2 weeks before
	they can be landed in an LTS staging branch. Only after "maturation" will those
	commits be cherry-picked or backported.

MessagePort can send messages after closed #42296

Description

Version

Platform

Subsystem

What steps will reproduce the bug?

How often does it reproduce? Is there a required condition?

What is the expected behavior?

What do you see instead?

Additional information

Activity

WillianAgostini commented on Mar 14, 2022

jrvidal commented on Mar 14, 2022

Trott commented on Mar 16, 2022

jrvidal commented on Mar 16, 2022

aduh95 commented on Mar 16, 2022

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