From 06926116703f76af8c16c0200658f4e7ccc2712a Mon Sep 17 00:00:00 2001
From: Anna Henningsen <anna@addaleax.net>
Date: Thu, 2 Apr 2020 23:43:20 +0200
Subject: [PATCH] src,test: add regression test for nested Worker termination

This adds a regression test for terminating a Worker inside which
another Worker is running.

PR-URL: https://github.com/nodejs/node/pull/32623
Refs: https://github.com/nodejs/node/pull/32531
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
---
 src/env.cc                                    |  2 ++
 test/parallel/test-worker-terminate-nested.js | 15 +++++++++++++++
 2 files changed, 17 insertions(+)
 create mode 100644 test/parallel/test-worker-terminate-nested.js

diff --git a/src/env.cc b/src/env.cc
index 7e177e3b86dcb9..295b68741dc5c6 100644
--- a/src/env.cc
+++ b/src/env.cc
@@ -1038,6 +1038,8 @@ void Environment::Exit(int exit_code) {
 }
 
 void Environment::stop_sub_worker_contexts() {
+  DCHECK_EQ(Isolate::GetCurrent(), isolate());
+
   while (!sub_worker_contexts_.empty()) {
     Worker* w = *sub_worker_contexts_.begin();
     remove_sub_worker_context(w);
diff --git a/test/parallel/test-worker-terminate-nested.js b/test/parallel/test-worker-terminate-nested.js
new file mode 100644
index 00000000000000..3924528cea1ccb
--- /dev/null
+++ b/test/parallel/test-worker-terminate-nested.js
@@ -0,0 +1,15 @@
+'use strict';
+const common = require('../common');
+const { Worker } = require('worker_threads');
+
+// Check that a Worker that's running another Worker can be terminated.
+
+const worker = new Worker(`
+const { Worker, parentPort } = require('worker_threads');
+const worker = new Worker('setInterval(() => {}, 10);', { eval: true });
+worker.on('online', () => {
+  parentPort.postMessage({});
+});
+`, { eval: true });
+
+worker.on('message', common.mustCall(() => worker.terminate()));