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Windows: ConoutConnection worker thread prevents Node.js from exiting after kill()

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#887 4 comentarios 0 reacciones 0 asignados Ver en GitHub

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Evaluación

Dificultad
3/5
Tiempo estimado
1-2 días
Aptitud para principiantes
70/100
Tipo de issue
Error
Claridad
Bien especificado
Estado de actividad
Tranquilo
Stack tecnológico
node.js, typescript
Área
cli

Línea de trabajo

Reproduce el bloqueo de Windows ConPTY con el script de Node.js proporcionado y, después, inspecciona src/windowsConoutConnection.ts, src/worker/conoutSocketWorker.ts y src/windowsPtyAgent.ts en las líneas indicadas. Comprueba el worker, los sockets y los timeouts de cleanup implicados después de kill(). La tarea está terminada cuando el proceso sale después del evento exit sin requerir process.exit(), mientras el cleanup sigue completándose cuando otro trabajo mantiene activo el event loop.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

Environment

  • OS: Windows (ConPTY path)
  • node-pty version: 1.2.0-beta.10
  • Node.js: v22.22.0

Description

After calling kill() on a Windows PTY and awaiting its exit event, Node.js cannot exit because active handles remain on the event loop. This forces consumers to call process.exit() as a workaround.

The root cause is that the ConoutConnection worker thread, its internal sockets, and several cleanup timeouts are never unref()'d. There is no .unref() call anywhere in node-pty's source.

Reproduction

const pty = require('node-pty');

const term = pty.spawn('cmd.exe', [], { cols: 80, rows: 24 });

term.onExit(() => {
  console.log('exited');
  // Node.js should exit here, but it hangs indefinitely
});

setTimeout(() => term.kill(), 500);

Expected: process exits after "exited" is logged.
Actual: process hangs indefinitely.

Root cause

There are three categories of handles keeping the event loop alive after kill():

1. Worker thread (primary)

src/windowsConoutConnection.ts:47 — the Worker is created but never unref()'d:

this._worker = new Worker(join(scriptPath, 'worker/conoutSocketWorker.js'), { workerData });

The worker runs a net.Socket + net.createServer (src/worker/conoutSocketWorker.ts:11-17) that are also never unref()'d. Both the worker thread and its internal sockets keep the event loop alive.

2. Drain timeout

When dispose() is called, it schedules a 1-second timeout before terminating the worker (src/windowsConoutConnection.ts:76):

this._drainTimeout = setTimeout(() => this._destroySocket(), FLUSH_DATA_INTERVAL);

This timeout is not unref()'d, keeping the event loop alive for the duration.

A similar un-unref()'d timeout exists in WindowsPtyAgent._flushDataAndCleanUp() (src/windowsPtyAgent.ts:179):

this._closeTimeout = setTimeout(() => this._cleanUpProcess(), FLUSH_DATA_INTERVAL);
3. I/O sockets

_outSocket and _inSocket in WindowsPtyAgent (src/windowsPtyAgent.ts:78-94) are never unref()'d.

Suggested fix

Call unref() on handles that shouldn't prevent process exit:

// windowsConoutConnection.ts — constructor
this._worker = new Worker(join(scriptPath, 'worker/conoutSocketWorker.js'), { workerData });
this._worker.unref();

// windowsConoutConnection.ts — _drainDataAndClose
this._drainTimeout = setTimeout(() => this._destroySocket(), FLUSH_DATA_INTERVAL);
this._drainTimeout.unref();

// windowsPtyAgent.ts — constructor (sockets)
this._outSocket.unref();
this._inSocket.unref();

// windowsPtyAgent.ts — _flushDataAndCleanUp
this._closeTimeout = setTimeout(() => this._cleanUpProcess(), FLUSH_DATA_INTERVAL);
this._closeTimeout.unref();

This ensures cleanup completes if other work keeps the event loop alive, but doesn't prevent the process from exiting when everything else is done.

Lenguaje dominante
TypeScript
Estrellas
2k
Forks
337
Merge medio
21 h 58 min
PR fusionados (30 d)
3

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