From dd290bd26a89bb2974755135724f2d22b32aaf30 Mon Sep 17 00:00:00 2001
From: Kleis Auke Wolthuizen <github@kleisauke.nl>
Date: Fri, 23 Jul 2021 15:03:04 +0200
Subject: [PATCH 1/2] Remove early return from `exitRuntime()`. NFC

`exitRuntime()` is never called when `ENVIRONMENT_IS_PTHREAD` is true.
---
 src/preamble.js | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/preamble.js b/src/preamble.js
index 0d37997e53e50..3a823d2a3343f 100644
--- a/src/preamble.js
+++ b/src/preamble.js
@@ -209,7 +209,6 @@ function exitRuntime() {
 #if STACK_OVERFLOW_CHECK
   checkStackCookie();
 #endif
-  {{{ runIfWorkerThread('return;') }}} // PThreads reuse the runtime from the main thread.
 #if !STANDALONE_WASM
   ___funcs_on_exit(); // Native atexit() functions
 #endif

From 3363b04dad04732165cf45a2cc8dd45d031d9e43 Mon Sep 17 00:00:00 2001
From: Kleis Auke Wolthuizen <github@kleisauke.nl>
Date: Tue, 5 May 2026 18:09:16 +0200
Subject: [PATCH 2/2] Add assertion

---
 src/preamble.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/preamble.js b/src/preamble.js
index 3a823d2a3343f..b039a508fac0a 100644
--- a/src/preamble.js
+++ b/src/preamble.js
@@ -201,6 +201,9 @@ function exitRuntime() {
   assert(!runtimeExited);
   assert(!runtimeExiting, 'Re-entrant call to exitRuntime()! This can happen if an atexit() registered callback throws an exception.');
   runtimeExiting = true;
+#if PTHREADS || WASM_WORKERS
+  assert(!{{{ ENVIRONMENT_IS_WORKER_THREAD() }}}, 'exitRuntime() should only be called from the main thread');
+#endif
 #endif
 #if ASYNCIFY == 1 && ASSERTIONS
   // ASYNCIFY cannot be used once the runtime starts shutting down.