Repo created

TMessagesProj/jni/voip/webrtc/base/sequence_token.cc

@@ -0,0 +1,96 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/sequence_token.h"
+
+#include "base/atomic_sequence_num.h"
+#include "base/logging.h"
+#include "base/no_destructor.h"
+#include "base/threading/thread_local.h"
+
+namespace base {
+
+namespace {
+
+base::AtomicSequenceNumber g_sequence_token_generator;
+
+base::AtomicSequenceNumber g_task_token_generator;
+
+ThreadLocalPointer<const SequenceToken>& GetTlsCurrentSequenceToken() {
+  static base::NoDestructor<ThreadLocalPointer<const SequenceToken>> instance;
+  return *instance;
+}
+
+ThreadLocalPointer<const TaskToken>& GetTlsCurrentTaskToken() {
+  static base::NoDestructor<ThreadLocalPointer<const TaskToken>> instance;
+  return *instance;
+}
+
+}  // namespace
+
+bool SequenceToken::operator==(const SequenceToken& other) const {
+  return token_ == other.token_ && IsValid();
+}
+
+bool SequenceToken::operator!=(const SequenceToken& other) const {
+  return !(*this == other);
+}
+
+bool SequenceToken::IsValid() const {
+  return token_ != kInvalidSequenceToken;
+}
+
+int SequenceToken::ToInternalValue() const {
+  return token_;
+}
+
+SequenceToken SequenceToken::Create() {
+  return SequenceToken(g_sequence_token_generator.GetNext());
+}
+
+SequenceToken SequenceToken::GetForCurrentThread() {
+  const SequenceToken* current_sequence_token =
+      GetTlsCurrentSequenceToken().Get();
+  return current_sequence_token ? *current_sequence_token : SequenceToken();
+}
+
+bool TaskToken::operator==(const TaskToken& other) const {
+  return token_ == other.token_ && IsValid();
+}
+
+bool TaskToken::operator!=(const TaskToken& other) const {
+  return !(*this == other);
+}
+
+bool TaskToken::IsValid() const {
+  return token_ != kInvalidTaskToken;
+}
+
+TaskToken TaskToken::Create() {
+  return TaskToken(g_task_token_generator.GetNext());
+}
+
+TaskToken TaskToken::GetForCurrentThread() {
+  const TaskToken* current_task_token = GetTlsCurrentTaskToken().Get();
+  return current_task_token ? *current_task_token : TaskToken();
+}
+
+ScopedSetSequenceTokenForCurrentThread::ScopedSetSequenceTokenForCurrentThread(
+    const SequenceToken& sequence_token)
+    : sequence_token_(sequence_token), task_token_(TaskToken::Create()) {
+  DCHECK(!GetTlsCurrentSequenceToken().Get());
+  DCHECK(!GetTlsCurrentTaskToken().Get());
+  GetTlsCurrentSequenceToken().Set(&sequence_token_);
+  GetTlsCurrentTaskToken().Set(&task_token_);
+}
+
+ScopedSetSequenceTokenForCurrentThread::
+    ~ScopedSetSequenceTokenForCurrentThread() {
+  DCHECK_EQ(GetTlsCurrentSequenceToken().Get(), &sequence_token_);
+  DCHECK_EQ(GetTlsCurrentTaskToken().Get(), &task_token_);
+  GetTlsCurrentSequenceToken().Set(nullptr);
+  GetTlsCurrentTaskToken().Set(nullptr);
+}
+
+}  // namespace base