1 files changed, 202 insertions, 0 deletions
diff --git a/ipc/chromium/src/base/thread.cc b/ipc/chromium/src/base/thread.cc
new file mode 100644
index 0000000000..3fc258af2d
--- /dev/null
+++ b/ipc/chromium/src/base/thread.cc
@@ -0,0 +1,202 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+// Copyright (c) 2006-2009 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/thread.h"
+
+#include "base/string_util.h"
+#include "base/thread_local.h"
+#include "base/waitable_event.h"
+#include "GeckoProfiler.h"
+#include "mozilla/EventQueue.h"
+#include "mozilla/IOInterposer.h"
+#include "mozilla/ThreadEventQueue.h"
+#include "nsThreadUtils.h"
+#include "nsThreadManager.h"
+
+namespace base {
+
+// This task is used to trigger the message loop to exit.
+class ThreadQuitTask : public mozilla::Runnable {
+ public:
+  ThreadQuitTask() : mozilla::Runnable("ThreadQuitTask") {}
+  NS_IMETHOD Run() override {
+    MessageLoop::current()->Quit();
+    Thread::SetThreadWasQuitProperly(true);
+    return NS_OK;
+  }
+};
+
+// Used to pass data to ThreadMain.  This structure is allocated on the stack
+// from within StartWithOptions.
+struct Thread::StartupData {
+  // We get away with a const reference here because of how we are allocated.
+  const Thread::Options& options;
+
+  // Used to synchronize thread startup.
+  WaitableEvent event;
+
+  explicit StartupData(const Options& opt)
+      : options(opt), event(false, false) {}
+};
+
+Thread::Thread(const char* name)
+    : startup_data_(NULL),
+      thread_(0),
+      message_loop_(NULL),
+      thread_id_(0),
+      name_(name) {
+  MOZ_COUNT_CTOR(base::Thread);
+}
+
+Thread::~Thread() {
+  MOZ_COUNT_DTOR(base::Thread);
+  Stop();
+}
+
+namespace {
+
+// We use this thread-local variable to record whether or not a thread exited
+// because its Stop method was called.  This allows us to catch cases where
+// MessageLoop::Quit() is called directly, which is unexpected when using a
+// Thread to setup and run a MessageLoop.
+
+static base::ThreadLocalBoolean& get_tls_bool() {
+  static base::ThreadLocalBoolean tls_ptr;
+  return tls_ptr;
+}
+
+}  // namespace
+
+void Thread::SetThreadWasQuitProperly(bool flag) { get_tls_bool().Set(flag); }
+
+bool Thread::GetThreadWasQuitProperly() {
+  bool quit_properly = true;
+#ifndef NDEBUG
+  quit_properly = get_tls_bool().Get();
+#endif
+  return quit_properly;
+}
+
+bool Thread::Start() { return StartWithOptions(Options()); }
+
+bool Thread::StartWithOptions(const Options& options) {
+  DCHECK(!message_loop_);
+
+  SetThreadWasQuitProperly(false);
+
+  StartupData startup_data(options);
+  startup_data_ = &startup_data;
+
+  if (!PlatformThread::Create(options.stack_size, this, &thread_)) {
+    DLOG(ERROR) << "failed to create thread";
+    startup_data_ = NULL;  // Record that we failed to start.
+    return false;
+  }
+
+  // Wait for the thread to start and initialize message_loop_
+  startup_data.event.Wait();
+
+  DCHECK(message_loop_);
+  return true;
+}
+
+void Thread::Stop() {
+  if (!thread_was_started()) return;
+
+  // We should only be called on the same thread that started us.
+  DCHECK_NE(thread_id_, PlatformThread::CurrentId());
+
+  // StopSoon may have already been called.
+  if (message_loop_) {
+    RefPtr<ThreadQuitTask> task = new ThreadQuitTask();
+    message_loop_->PostTask(task.forget());
+  }
+
+  // Wait for the thread to exit.  It should already have terminated but make
+  // sure this assumption is valid.
+  //
+  // TODO(darin): Unfortunately, we need to keep message_loop_ around until
+  // the thread exits.  Some consumers are abusing the API.  Make them stop.
+  //
+  PlatformThread::Join(thread_);
+
+  // The thread can't receive messages anymore.
+  message_loop_ = NULL;
+
+  // The thread no longer needs to be joined.
+  startup_data_ = NULL;
+}
+
+void Thread::StopSoon() {
+  if (!message_loop_) return;
+
+  // We should only be called on the same thread that started us.
+  DCHECK_NE(thread_id_, PlatformThread::CurrentId());
+
+  // We had better have a message loop at this point!  If we do not, then it
+  // most likely means that the thread terminated unexpectedly, probably due
+  // to someone calling Quit() on our message loop directly.
+  DCHECK(message_loop_);
+
+  RefPtr<ThreadQuitTask> task = new ThreadQuitTask();
+  message_loop_->PostTask(task.forget());
+}
+
+void Thread::ThreadMain() {
+  nsCOMPtr<nsIThread> xpcomThread;
+  auto loopType = startup_data_->options.message_loop_type;
+  if (loopType == MessageLoop::TYPE_MOZILLA_NONMAINTHREAD ||
+      loopType == MessageLoop::TYPE_MOZILLA_NONMAINUITHREAD) {
+    auto queue = mozilla::MakeRefPtr<mozilla::ThreadEventQueue>(
+        mozilla::MakeUnique<mozilla::EventQueue>());
+    xpcomThread = nsThreadManager::get().CreateCurrentThread(
+        queue, nsThread::NOT_MAIN_THREAD);
+  } else {
+    xpcomThread = NS_GetCurrentThread();
+  }
+
+  AUTO_PROFILER_REGISTER_THREAD(name_.c_str());
+  mozilla::IOInterposer::RegisterCurrentThread();
+
+  // The message loop for this thread.
+  MessageLoop message_loop(startup_data_->options.message_loop_type,
+                           xpcomThread);
+
+  xpcomThread = nullptr;
+
+  // Complete the initialization of our Thread object.
+  thread_id_ = PlatformThread::CurrentId();
+  PlatformThread::SetName(name_.c_str());
+  NS_SetCurrentThreadName(name_.c_str());
+  message_loop.set_thread_name(name_);
+  message_loop.set_hang_timeouts(startup_data_->options.transient_hang_timeout,
+                                 startup_data_->options.permanent_hang_timeout);
+  message_loop_ = &message_loop;
+
+  // Let the thread do extra initialization.
+  // Let's do this before signaling we are started.
+  Init();
+
+  startup_data_->event.Signal();
+  // startup_data_ can't be touched anymore since the starting thread is now
+  // unlocked.
+
+  message_loop.Run();
+
+  // Let the thread do extra cleanup.
+  CleanUp();
+
+  // Assert that MessageLoop::Quit was called by ThreadQuitTask.
+  DCHECK(GetThreadWasQuitProperly());
+
+  mozilla::IOInterposer::UnregisterCurrentThread();
+
+  // We can't receive messages anymore.
+  message_loop_ = NULL;
+  thread_id_ = 0;
+}
+
+}  // namespace base