1 // Copyright (c) 2011 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.
5 #ifndef IPC_IPC_SYNC_MESSAGE_FILTER_H_
6 #define IPC_IPC_SYNC_MESSAGE_FILTER_H_
9 #include "base/basictypes.h"
10 #include "base/memory/ref_counted.h"
11 #include "base/synchronization/lock.h"
12 #include "ipc/ipc_channel_proxy.h"
13 #include "ipc/ipc_sync_message.h"
17 class MessageLoopProxy
;
23 class MessageReplyDeserializer
;
25 // This MessageFilter allows sending synchronous IPC messages from a thread
26 // other than the listener thread associated with the SyncChannel. It does not
27 // support fancy features that SyncChannel does, such as handling recursion or
28 // receiving messages while waiting for a response. Note that this object can
29 // be used to send simultaneous synchronous messages from different threads.
30 class IPC_EXPORT SyncMessageFilter
: public ChannelProxy::MessageFilter
,
31 public Message::Sender
{
33 explicit SyncMessageFilter(base::WaitableEvent
* shutdown_event
);
34 virtual ~SyncMessageFilter();
36 // Message::Sender implementation.
37 virtual bool Send(Message
* message
);
39 // ChannelProxy::MessageFilter implementation.
40 virtual void OnFilterAdded(Channel
* channel
);
41 virtual void OnChannelError();
42 virtual void OnChannelClosing();
43 virtual bool OnMessageReceived(const Message
& message
);
46 void SendOnIOThread(Message
* message
);
47 // Signal all the pending sends as done, used in an error condition.
48 void SignalAllEvents();
50 // The channel to which this filter was added.
53 // The process's main thread.
54 scoped_refptr
<base::MessageLoopProxy
> listener_loop_
;
56 // The message loop where the Channel lives.
57 scoped_refptr
<base::MessageLoopProxy
> io_loop_
;
59 typedef std::set
<PendingSyncMsg
*> PendingSyncMessages
;
60 PendingSyncMessages pending_sync_messages_
;
62 // Locks data members above.
65 base::WaitableEvent
* shutdown_event_
;
67 DISALLOW_COPY_AND_ASSIGN(SyncMessageFilter
);
72 #endif // IPC_IPC_SYNC_MESSAGE_FILTER_H_