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.
5 #ifndef IPC_IPC_SYNC_MESSAGE_FILTER_H_
6 #define IPC_IPC_SYNC_MESSAGE_FILTER_H_
10 #include "base/basictypes.h"
11 #include "base/memory/ref_counted.h"
12 #include "base/synchronization/lock.h"
13 #include "ipc/ipc_sender.h"
14 #include "ipc/ipc_sync_message.h"
15 #include "ipc/message_filter.h"
18 class MessageLoopProxy
;
24 // This MessageFilter allows sending synchronous IPC messages from a thread
25 // other than the listener thread associated with the SyncChannel. It does not
26 // support fancy features that SyncChannel does, such as handling recursion or
27 // receiving messages while waiting for a response. Note that this object can
28 // be used to send simultaneous synchronous messages from different threads.
29 class IPC_EXPORT SyncMessageFilter
: public MessageFilter
, public Sender
{
31 explicit SyncMessageFilter(base::WaitableEvent
* shutdown_event
);
33 // MessageSender implementation.
34 virtual bool Send(Message
* message
) override
;
36 // MessageFilter implementation.
37 virtual void OnFilterAdded(Sender
* sender
) override
;
38 virtual void OnChannelError() override
;
39 virtual void OnChannelClosing() override
;
40 virtual bool OnMessageReceived(const Message
& message
) override
;
43 virtual ~SyncMessageFilter();
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_