Override the webrtc TaskQueue implementation.

third_party/webrtc_overrides/webrtc/base/task_queue.cc

+/*
+ *  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 "third_party/webrtc_overrides/webrtc/base/task_queue.h"
+
+#include "base/bind.h"
+#include "base/lazy_instance.h"
+#include "base/threading/thread.h"
+#include "base/threading/thread_local.h"
+
+namespace rtc {
+namespace {
+
+void RunTask(std::unique_ptr<QueuedTask> task) {
+  if (!task->Run()) {

[tommi (sloooow) - chröme, 2016/08/30 11:49:24]

nit: remove {}

[perkj_chrome, 2016/08/30 12:19:10]

Done.

+    task.release();
+  }
+}
+
+class PostAndReplyTask : public QueuedTask {
+ public:
+  PostAndReplyTask(
+      std::unique_ptr<QueuedTask> task,
+      std::unique_ptr<QueuedTask> reply,
+      const scoped_refptr<base::SingleThreadTaskRunner>& reply_task_runner)
+      : task_(std::move(task)),
+        reply_(std::move(reply)),
+        reply_task_runner_(reply_task_runner) {}
+
+  ~PostAndReplyTask() override {}
+
+ private:
+  bool Run() override {
+    if (!task_->Run())
+      task_.release();
+
+    reply_task_runner_->PostTask(FROM_HERE,
+                                 base::Bind(&RunTask, base::Passed(&reply_)));
+    return true;
+  }
+
+  std::unique_ptr<QueuedTask> task_;
+  std::unique_ptr<QueuedTask> reply_;
+  scoped_refptr<base::SingleThreadTaskRunner> reply_task_runner_;
+};
+
+}  // namespace
+
+// A lazily created thread local storage for quick access to a TaskQueue.
+base::LazyInstance<base::ThreadLocalPointer<TaskQueue>>::Leaky lazy_tls_ptr =
+    LAZY_INSTANCE_INITIALIZER;
+
+bool TaskQueue::IsCurrent() const {
+  return Current() == this;
+}
+
+class TaskQueue::WorkerThread : public base::Thread {
+ public:
+  WorkerThread(const char* queue_name, TaskQueue* queue);
+  ~WorkerThread();

[tommi (sloooow) - chröme, 2016/08/30 11:49:24]

override?

[perkj_chrome, 2016/08/30 12:19:10]

Done.

+
+ private:
+  virtual void Init() override;
+
+  TaskQueue* const queue_;
+};
+
+TaskQueue::WorkerThread::WorkerThread(const char* queue_name, TaskQueue* queue)
+    : base::Thread(queue_name), queue_(queue) {}
+
+void TaskQueue::WorkerThread::Init() {
+  lazy_tls_ptr.Pointer()->Set(queue_);
+}
+
+TaskQueue::WorkerThread::~WorkerThread() {
+  DCHECK(!Thread::IsRunning());
+}
+
+TaskQueue::TaskQueue(const char* queue_name)
+    : thread_(
+          std::unique_ptr<WorkerThread>(new WorkerThread(queue_name, this))) {
+  DCHECK(queue_name);
+  bool result = thread_->Start();
+  CHECK(result);
+}
+
+TaskQueue::~TaskQueue() {
+  DCHECK(!IsCurrent());
+  thread_->Stop();
+}
+
+// static
+TaskQueue* TaskQueue::Current() {
+  return lazy_tls_ptr.Pointer()->Get();
+}
+
+// static
+bool TaskQueue::IsCurrent(const char* queue_name) {
+  TaskQueue* current = Current();
+  return current && current->thread_->thread_name().compare(queue_name) == 0;
+}
+
+void TaskQueue::PostTask(std::unique_ptr<QueuedTask> task) {
+  thread_->task_runner()->PostTask(FROM_HERE,
+                                   base::Bind(&RunTask, base::Passed(&task)));
+}
+
+void TaskQueue::PostDelayedTask(std::unique_ptr<QueuedTask> task,
+                                uint32_t milliseconds) {
+  thread_->task_runner()->PostDelayedTask(
+      FROM_HERE, base::Bind(&RunTask, base::Passed(&task)),
+      base::TimeDelta::FromMilliseconds(milliseconds));
+}
+
+void TaskQueue::PostTaskAndReply(std::unique_ptr<QueuedTask> task,
+                                 std::unique_ptr<QueuedTask> reply,
+                                 TaskQueue* reply_queue) {
+  PostTask(std::unique_ptr<QueuedTask>(new PostAndReplyTask(
+      std::move(task), std::move(reply), reply_queue->thread_->task_runner())));
+}
+
+void TaskQueue::PostTaskAndReply(std::unique_ptr<QueuedTask> task,
+                                 std::unique_ptr<QueuedTask> reply) {
+  thread_->task_runner()->PostTaskAndReply(
+      FROM_HERE, base::Bind(&RunTask, base::Passed(&task)),
+      base::Bind(&RunTask, base::Passed(&reply)));
+}
+
+}  // namespace rtc