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Run worker threads with --v8-pool-size=0 #42523

Description

@daeyeon

Version

v18.0.0-pre

What steps will reproduce the bug?

// Flags: --v8-pool-size=0
const { Worker, isMainThread } = require('worker_threads');

if (isMainThread) {
  console.log('[main thread]');

  const worker = new Worker(__filename);
  worker.on('exit', (exitCode) => { console.log('worker exited with', exitCode); });
  process.on('exit', (exitCode) => { console.log('main thread exited with', exitCode); });
} else {
  console.log('[worker]');
}

Run a file including the above script with --v8-pool-size=0 cli option.

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

I guess it always occurs when running any script using worker_threads with --v8-pool-size=0.

What is the expected behavior?

[main thread]
[worker]
worker exited with 0
main thread exited with 0

What do you see instead?

[main thread]
[worker]

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