1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "chromeos/dbus/blocking_method_caller.h"
6
7 #include "base/bind.h"
8 #include "base/callback_helpers.h"
9 #include "base/location.h"
10 #include "base/task_runner.h"
11 #include "base/threading/thread_restrictions.h"
12 #include "dbus/bus.h"
13 #include "dbus/object_proxy.h"
14
15 namespace chromeos {
16
17 namespace {
18
19 // This function is a part of CallMethodAndBlock implementation.
CallMethodAndBlockInternal(scoped_ptr<dbus::Response> * response,base::ScopedClosureRunner * signaler,dbus::ObjectProxy * proxy,dbus::MethodCall * method_call)20 void CallMethodAndBlockInternal(
21 scoped_ptr<dbus::Response>* response,
22 base::ScopedClosureRunner* signaler,
23 dbus::ObjectProxy* proxy,
24 dbus::MethodCall* method_call) {
25 *response = proxy->CallMethodAndBlock(
26 method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT);
27 }
28
29 } // namespace
30
BlockingMethodCaller(dbus::Bus * bus,dbus::ObjectProxy * proxy)31 BlockingMethodCaller::BlockingMethodCaller(dbus::Bus* bus,
32 dbus::ObjectProxy* proxy)
33 : bus_(bus),
34 proxy_(proxy),
35 on_blocking_method_call_(false /* manual_reset */,
36 false /* initially_signaled */) {
37 }
38
~BlockingMethodCaller()39 BlockingMethodCaller::~BlockingMethodCaller() {
40 }
41
CallMethodAndBlock(dbus::MethodCall * method_call)42 scoped_ptr<dbus::Response> BlockingMethodCaller::CallMethodAndBlock(
43 dbus::MethodCall* method_call) {
44 // on_blocking_method_call_->Signal() will be called when |signaler| is
45 // destroyed.
46 base::Closure signal_task(
47 base::Bind(&base::WaitableEvent::Signal,
48 base::Unretained(&on_blocking_method_call_)));
49 base::ScopedClosureRunner* signaler =
50 new base::ScopedClosureRunner(signal_task);
51
52 scoped_ptr<dbus::Response> response;
53 bus_->GetDBusTaskRunner()->PostTask(
54 FROM_HERE,
55 base::Bind(&CallMethodAndBlockInternal,
56 &response,
57 base::Owned(signaler),
58 base::Unretained(proxy_),
59 method_call));
60 // http://crbug.com/125360
61 base::ThreadRestrictions::ScopedAllowWait allow_wait;
62 on_blocking_method_call_.Wait();
63 return response.Pass();
64 }
65
66 } // namespace chromeos
67