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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/dbus/thread_linux/dbus_thread_linux.h"
#include "base/no_destructor.h"
#include "base/synchronization/lock.h"
#include "base/task/lazy_thread_pool_task_runner.h"
#include "base/task/single_thread_task_runner.h"
#include "dbus/bus.h"
namespace dbus_thread_linux {
namespace {
// Returns a global singleton reference to a session bus.
scoped_refptr<dbus::Bus>& GetSharedSessionBusRefPtrInstance() {
// Store the bus in a lazy static variable instead of a global to avoid a
// static initializer.
static base::NoDestructor<scoped_refptr<dbus::Bus>> bus;
return *bus;
}
// Returns a global singleton reference to a system bus.
scoped_refptr<dbus::Bus>& GetSharedSystemBusRefPtrInstance() {
// Store the bus in a lazy static variable instead of a global to avoid a
// static initializer.
static base::NoDestructor<scoped_refptr<dbus::Bus>> bus;
return *bus;
}
// Use TaskPriority::USER_BLOCKING, because there is a client
// (NotificationPlatformBridgeLinuxImpl) which needs to run user-blocking tasks
// on this thread. Use SingleThreadTaskRunnerThreadMode::SHARED, because DBus
// does not require an exclusive use of the thread, only the existence of a
// single thread for all tasks.
base::LazyThreadPoolSingleThreadTaskRunner g_dbus_thread_task_runner =
LAZY_THREAD_POOL_SINGLE_THREAD_TASK_RUNNER_INITIALIZER(
base::TaskTraits(base::MayBlock(), base::TaskPriority::USER_BLOCKING),
base::SingleThreadTaskRunnerThreadMode::SHARED);
scoped_refptr<dbus::Bus> CreateSharedBus(dbus::Bus::BusType bus_type) {
dbus::Bus::Options options;
options.bus_type = bus_type;
options.connection_type = dbus::Bus::PRIVATE;
options.dbus_task_runner = g_dbus_thread_task_runner.Get();
return base::MakeRefCounted<dbus::Bus>(options);
}
} // namespace
scoped_refptr<dbus::Bus> GetSharedSessionBus() {
static base::Lock lock;
base::AutoLock guard(lock);
auto& session_bus = GetSharedSessionBusRefPtrInstance();
if (!session_bus) {
session_bus = CreateSharedBus(dbus::Bus::SESSION);
}
return session_bus;
}
scoped_refptr<dbus::Bus> GetSharedSystemBus() {
static base::Lock lock;
base::AutoLock guard(lock);
auto& system_bus = GetSharedSystemBusRefPtrInstance();
if (!system_bus) {
system_bus = CreateSharedBus(dbus::Bus::SYSTEM);
}
return system_bus;
}
void ShutdownOnDBusThreadAndBlock() {
if (auto& session_bus = GetSharedSessionBusRefPtrInstance()) {
session_bus->ShutdownOnDBusThreadAndBlock();
session_bus = nullptr;
}
if (auto& system_bus = GetSharedSystemBusRefPtrInstance()) {
system_bus->ShutdownOnDBusThreadAndBlock();
system_bus = nullptr;
}
}
} // namespace dbus_thread_linux
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