chromium/ipc/ipc_sync_message_filter.h

// Copyright 2012 The Chromium Authors
// 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 <vector>

#include "base/component_export.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
#include "ipc/ipc_sender.h"
#include "ipc/ipc_sync_message.h"
#include "ipc/message_filter.h"
#include "mojo/public/cpp/bindings/generic_pending_associated_receiver.h"
#include "mojo/public/cpp/bindings/scoped_interface_endpoint_handle.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 COMPONENT_EXPORT(IPC) SyncMessageFilter : public MessageFilter,
                                                public Sender { … };

}  // namespace IPC

#endif  // IPC_IPC_SYNC_MESSAGE_FILTER_H_