Reland "Add Linux support for the Bluetooth API"

device/bluetooth/dbus/dbus_thread_manager_linux.cc

+// Copyright (c) 2012 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 "device/bluetooth/dbus/dbus_thread_manager_linux.h"
+
+#include "base/threading/thread.h"
+#include "dbus/bus.h"
+
+namespace bluez {
+
+static DBusThreadManagerLinux* g_linux_dbus_manager = NULL;
+
+DBusThreadManagerLinux::DBusThreadManagerLinux() {
+  base::Thread::Options thread_options;
+  thread_options.message_loop_type = base::MessageLoop::TYPE_IO;
+  dbus_thread_.reset(new base::Thread("D-Bus thread"));
+  dbus_thread_->StartWithOptions(thread_options);
+
+  // Create the connection to the system bus.
+  dbus::Bus::Options system_bus_options;
+  system_bus_options.bus_type = dbus::Bus::SYSTEM;
+  system_bus_options.connection_type = dbus::Bus::PRIVATE;
+  system_bus_options.dbus_task_runner = dbus_thread_->task_runner();
+  system_bus_ = new dbus::Bus(system_bus_options);
+}
+
+DBusThreadManagerLinux::~DBusThreadManagerLinux() {
+  // Shut down the bus. During the browser shutdown, it's ok to shut down
+  // the bus synchronously.
+  if (system_bus_.get())
+    system_bus_->ShutdownOnDBusThreadAndBlock();
+
+  // Stop the D-Bus thread.
+  if (dbus_thread_)
+    dbus_thread_->Stop();
+
+  if (!g_linux_dbus_manager)
+    return;  // Called form Shutdown() or local test instance.
+
+  // There should never be both a global instance and a local instance.
+  CHECK(this == g_linux_dbus_manager);
+}
+
+dbus::Bus* DBusThreadManagerLinux::GetSystemBus() {
+  return system_bus_.get();
+}
+
+// static
+void DBusThreadManagerLinux::Initialize() {
+  CHECK(!g_linux_dbus_manager);
+  g_linux_dbus_manager = new DBusThreadManagerLinux();
+}
+
+// static
+void DBusThreadManagerLinux::Shutdown() {
+  // Ensure that we only shutdown LinuxDBusManager once.
+  CHECK(g_linux_dbus_manager);
+  DBusThreadManagerLinux* dbus_thread_manager = g_linux_dbus_manager;
+  g_linux_dbus_manager = NULL;
+  delete dbus_thread_manager;
+  VLOG(1) << "LinuxDBusManager Shutdown completed";
+}
+
+// static
+DBusThreadManagerLinux* DBusThreadManagerLinux::Get() {
+  CHECK(g_linux_dbus_manager)
+      << "LinuxDBusManager::Get() called before Initialize()";
+  return g_linux_dbus_manager;
+}
+
+}  // namespace bluez