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// 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.
#ifndef IPC_IPC_SYNC_MESSAGE_FILTER_H_
#define IPC_IPC_SYNC_MESSAGE_FILTER_H_
#include <set>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_vector.h"
#include "base/synchronization/lock.h"
#include "ipc/ipc_sender.h"
#include "ipc/ipc_sync_message.h"
#include "ipc/message_filter.h"
namespace base {
class SingleThreadTaskRunner;
class WaitableEvent;
}
namespace IPC {
class SyncChannel;
// This MessageFilter allows sending synchronous IPC messages from a thread
// other than the listener thread associated with the SyncChannel. It does not
// support fancy features that SyncChannel does, such as handling recursion or
// receiving messages while waiting for a response. Note that this object can
// be used to send simultaneous synchronous messages from different threads.
class IPC_EXPORT SyncMessageFilter : public MessageFilter, public Sender {
public:
// MessageSender implementation.
bool Send(Message* message) override;
// MessageFilter implementation.
void OnFilterAdded(Sender* sender) override;
void OnChannelError() override;
void OnChannelClosing() override;
bool OnMessageReceived(const Message& message) override;
protected:
SyncMessageFilter(base::WaitableEvent* shutdown_event,
bool is_channel_send_thread_safe);
~SyncMessageFilter() override;
private:
friend class SyncChannel;
void set_is_channel_send_thread_safe(bool is_channel_send_thread_safe) {
is_channel_send_thread_safe_ = is_channel_send_thread_safe;
}
void SendOnIOThread(Message* message);
// Signal all the pending sends as done, used in an error condition.
void SignalAllEvents();
// The channel to which this filter was added.
Sender* sender_;
// Indicates if |sender_|'s Send method is thread-safe.
bool is_channel_send_thread_safe_;
// The process's main thread.
scoped_refptr<base::SingleThreadTaskRunner> listener_task_runner_;
// The message loop where the Channel lives.
scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
typedef std::set<PendingSyncMsg*> PendingSyncMessages;
PendingSyncMessages pending_sync_messages_;
// Messages waiting to be delivered after IO initialization.
ScopedVector<Message> pending_messages_;
// Locks data members above.
base::Lock lock_;
base::WaitableEvent* shutdown_event_;
DISALLOW_COPY_AND_ASSIGN(SyncMessageFilter);
};
} // namespace IPC
#endif // IPC_IPC_SYNC_MESSAGE_FILTER_H_
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