From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 21:33:14 +0200
Subject: Adding upstream version 115.7.0esr.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 dom/media/webrtc/transport/transportflow.cpp | 74 ++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 dom/media/webrtc/transport/transportflow.cpp

(limited to 'dom/media/webrtc/transport/transportflow.cpp')

diff --git a/dom/media/webrtc/transport/transportflow.cpp b/dom/media/webrtc/transport/transportflow.cpp
new file mode 100644
index 0000000000..8b263c8cfe
--- /dev/null
+++ b/dom/media/webrtc/transport/transportflow.cpp
@@ -0,0 +1,74 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Original author: ekr@rtfm.com
+#include <deque>
+
+#include "transportflow.h"
+#include "transportlayer.h"
+
+namespace mozilla {
+
+NS_IMPL_ISUPPORTS0(TransportFlow)
+
+// There are some hacks here to allow destruction off of
+// the main thread.
+TransportFlow::~TransportFlow() {
+  // Push the destruction onto the STS thread. Note that there
+  // is still some possibility that someone is accessing this
+  // object simultaneously, but as long as smart pointer discipline
+  // is maintained, it shouldn't be possible to access and
+  // destroy it simultaneously. The conversion to a UniquePtr
+  // ensures automatic destruction of the queue at exit of
+  // DestroyFinal.
+  CheckThread();
+  ClearLayers(layers_.get());
+}
+
+void TransportFlow::DestroyFinal(
+    UniquePtr<std::deque<TransportLayer*>> layers) {
+  ClearLayers(layers.get());
+}
+
+void TransportFlow::ClearLayers(std::deque<TransportLayer*>* layers) {
+  while (!layers->empty()) {
+    delete layers->front();
+    layers->pop_front();
+  }
+}
+
+void TransportFlow::PushLayer(TransportLayer* layer) {
+  CheckThread();
+  layers_->push_front(layer);
+  EnsureSameThread(layer);
+  layer->SetFlowId(id_);
+}
+
+TransportLayer* TransportFlow::GetLayer(const std::string& id) const {
+  CheckThread();
+
+  if (layers_) {
+    for (TransportLayer* layer : *layers_) {
+      if (layer->id() == id) return layer;
+    }
+  }
+
+  return nullptr;
+}
+
+void TransportFlow::EnsureSameThread(TransportLayer* layer) {
+  // Enforce that if any of the layers have a thread binding,
+  // they all have the same binding.
+  if (target_) {
+    const nsCOMPtr<nsIEventTarget>& lthread = layer->GetThread();
+
+    if (lthread && (lthread != target_)) MOZ_CRASH();
+  } else {
+    target_ = layer->GetThread();
+  }
+}
+
+}  // namespace mozilla
-- 
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