From a2332517490ae807140566ab78720a40ff5f15c4 Mon Sep 17 00:00:00 2001
From: Lorn Potter <lorn.potter@gmail.com>
Date: Thu, 23 Dec 2021 06:41:01 +1000
Subject: [PATCH] wasm: hardcode idealThreadCount for some browsers
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Browsers like Safari do not support the hardwareConcurrency property.
Will hard code it to 2, as iOS only supports that amount.

Change-Id: Icb35d3b698b28d8191a554167dc8cc262b806fb2
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
(cherry picked from commit be5508fad068f422fd88b82c11db71bcc26f248f)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 src/corelib/kernel/qcoreapplication.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/corelib/kernel/qcoreapplication.cpp b/src/corelib/kernel/qcoreapplication.cpp
index a2f227ee5a4..2bc4acf90bc 100644
--- a/src/corelib/kernel/qcoreapplication.cpp
+++ b/src/corelib/kernel/qcoreapplication.cpp
@@ -788,7 +788,11 @@ void QCoreApplicationPrivate::init()
 
 #if QT_CONFIG(thread)
 #ifdef Q_OS_WASM
-    QThreadPrivate::idealThreadCount = emscripten::val::global("navigator")["hardwareConcurrency"].as<int>();
+    emscripten::val hardwareConcurrency = emscripten::val::global("navigator")["hardwareConcurrency"];
+    if (hardwareConcurrency.isUndefined())
+        QThreadPrivate::idealThreadCount = 2;
+    else
+        QThreadPrivate::idealThreadCount = hardwareConcurrency.as<int>();
 #endif
 #endif