From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 02:47:55 +0200
Subject: Adding upstream version 124.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 third_party/libwebrtc/rtc_base/weak_ptr.cc | 77 ++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 third_party/libwebrtc/rtc_base/weak_ptr.cc

(limited to 'third_party/libwebrtc/rtc_base/weak_ptr.cc')

diff --git a/third_party/libwebrtc/rtc_base/weak_ptr.cc b/third_party/libwebrtc/rtc_base/weak_ptr.cc
new file mode 100644
index 0000000000..3bfa71b0b4
--- /dev/null
+++ b/third_party/libwebrtc/rtc_base/weak_ptr.cc
@@ -0,0 +1,77 @@
+/*
+ *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "rtc_base/weak_ptr.h"
+
+// The implementation is borrowed from chromium except that it does not
+// implement SupportsWeakPtr.
+
+namespace rtc {
+namespace internal {
+
+WeakReference::Flag::Flag() : is_valid_(true) {}
+
+void WeakReference::Flag::Invalidate() {
+  RTC_DCHECK(checker_.IsCurrent())
+      << "WeakPtrs must be invalidated on the same sequence.";
+  is_valid_ = false;
+}
+
+bool WeakReference::Flag::IsValid() const {
+  RTC_DCHECK(checker_.IsCurrent())
+      << "WeakPtrs must be checked on the same sequence.";
+  return is_valid_;
+}
+
+WeakReference::Flag::~Flag() {}
+
+WeakReference::WeakReference() {}
+
+WeakReference::WeakReference(const Flag* flag) : flag_(flag) {}
+
+WeakReference::~WeakReference() {}
+
+WeakReference::WeakReference(WeakReference&& other) = default;
+
+WeakReference::WeakReference(const WeakReference& other) = default;
+
+bool WeakReference::is_valid() const {
+  return flag_.get() && flag_->IsValid();
+}
+
+WeakReferenceOwner::WeakReferenceOwner() {}
+
+WeakReferenceOwner::~WeakReferenceOwner() {
+  Invalidate();
+}
+
+WeakReference WeakReferenceOwner::GetRef() const {
+  // If we hold the last reference to the Flag then create a new one.
+  if (!HasRefs())
+    flag_ = new RefCountedObject<WeakReference::Flag>();
+
+  return WeakReference(flag_.get());
+}
+
+void WeakReferenceOwner::Invalidate() {
+  if (flag_.get()) {
+    flag_->Invalidate();
+    flag_ = nullptr;
+  }
+}
+
+WeakPtrBase::WeakPtrBase() {}
+
+WeakPtrBase::~WeakPtrBase() {}
+
+WeakPtrBase::WeakPtrBase(const WeakReference& ref) : ref_(ref) {}
+
+}  // namespace internal
+}  // namespace rtc
-- 
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