[tbb-commits] [tor-browser] 13/14: Bug 1767920 - Increase thread stack size on windows (for ESR 102), r=#necko, a=dmeehan

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richard pushed a commit to branch tor-browser-91.13.0esr-11.5-1
in repository tor-browser.

commit 676b50fef91c9c2c4b560f85d8e313b3d045bb18
Author: Kershaw Chang <kershaw at mozilla.com>
AuthorDate: Wed Nov 2 18:05:44 2022 +0000

    Bug 1767920 - Increase thread stack size on windows (for ESR 102), r=#necko, a=dmeehan
    
    Differential Revision: https://phabricator.services.mozilla.com/D161059
---
 modules/libpref/init/StaticPrefList.yaml   |  5 +++++
 netwerk/base/nsSocketTransportService2.cpp | 19 +++++++++++++++++--
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/modules/libpref/init/StaticPrefList.yaml b/modules/libpref/init/StaticPrefList.yaml
index b87714065456..f9f31be1fe4c 100644
--- a/modules/libpref/init/StaticPrefList.yaml
+++ b/modules/libpref/init/StaticPrefList.yaml
@@ -9896,6 +9896,11 @@
   value: true
   mirror: always
 
+- name: network.allow_large_stack_size_for_socket_thread
+  type: RelaxedAtomicBool
+  value: true
+  mirror: always
+
 #---------------------------------------------------------------------------
 # Prefs starting with "nglayout."
 #---------------------------------------------------------------------------
diff --git a/netwerk/base/nsSocketTransportService2.cpp b/netwerk/base/nsSocketTransportService2.cpp
index 3cad25875445..bedaaadae860 100644
--- a/netwerk/base/nsSocketTransportService2.cpp
+++ b/netwerk/base/nsSocketTransportService2.cpp
@@ -716,6 +716,21 @@ void nsSocketTransportService::UpdatePrefs(const char* aPref, void* aSelf) {
   static_cast<nsSocketTransportService*>(aSelf)->UpdatePrefs();
 }
 
+static uint32_t GetThreadStackSize() {
+#ifdef XP_WIN
+  if (!StaticPrefs::network_allow_large_stack_size_for_socket_thread()) {
+    return nsIThreadManager::DEFAULT_STACK_SIZE;
+  }
+
+  const uint32_t kWindowsThreadStackSize = 512 * 1024;
+  // We can remove this custom stack size when DEFAULT_STACK_SIZE is increased.
+  static_assert(kWindowsThreadStackSize > nsIThreadManager::DEFAULT_STACK_SIZE);
+  return kWindowsThreadStackSize;
+#else
+  return nsIThreadManager::DEFAULT_STACK_SIZE;
+#endif
+}
+
 // called from main thread only
 NS_IMETHODIMP
 nsSocketTransportService::Init() {
@@ -733,8 +748,8 @@ nsSocketTransportService::Init() {
   }
 
   nsCOMPtr<nsIThread> thread;
-  nsresult rv =
-      NS_NewNamedThread("Socket Thread", getter_AddRefs(thread), this);
+  nsresult rv = NS_NewNamedThread("Socket Thread", getter_AddRefs(thread), this,
+                                  GetThreadStackSize());
   NS_ENSURE_SUCCESS(rv, rv);
 
   {

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