From 2914a99511a5362b5a9b516723d5233d2b93bf8c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jukka=20Jyl=C3=A4nki?= <jujjyl@gmail.com>
Date: Wed, 7 Feb 2024 18:02:27 +0200
Subject: [PATCH] Don't run PThread.initMainThread() on Wasm Workers. Fixes
 #20279.

---
 src/library_pthread.js | 10 +++-------
 src/parseTools.js      |  9 +++++++++
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/src/library_pthread.js b/src/library_pthread.js
index b1497ff91a10..04b93561a8fd 100644
--- a/src/library_pthread.js
+++ b/src/library_pthread.js
@@ -92,14 +92,10 @@ var LibraryPThread = {
 #if ASSERTIONS
       PThread.debugInit();
 #endif
-      if (ENVIRONMENT_IS_PTHREAD
-#if AUDIO_WORKLET
-        || ENVIRONMENT_IS_AUDIO_WORKLET
-#endif
-        ) {
-        PThread.initWorker();
-      } else {
+      if ({{{ ENVIRONMENT_IS_MAIN_THREAD() }}}) {
         PThread.initMainThread();
+      } else {
+        PThread.initWorker();
       }
     },
     initMainThread() {
diff --git a/src/parseTools.js b/src/parseTools.js
index 74137e35fbeb..c951f0dd1ea7 100644
--- a/src/parseTools.js
+++ b/src/parseTools.js
@@ -1043,3 +1043,12 @@ function getPerformanceNow() {
 function implicitSelf() {
   return ENVIRONMENT.includes('node') ? 'self.' : '';
 }
+
+function ENVIRONMENT_IS_MAIN_THREAD() {
+  var envs = [];
+  if (USE_PTHREADS) envs.push('ENVIRONMENT_IS_PTHREAD');
+  if (WASM_WORKERS) envs.push('ENVIRONMENT_IS_WASM_WORKER');
+  if (AUDIO_WORKLET) envs.push('ENVIRONMENT_IS_AUDIO_WORKLET');
+  if (envs.length == 0) return 'true';
+  return '(!(' + envs.join('||') + '))';
+}