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// Copyright (c) 2008 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 BASE_MESSAGE_PUMP_GLIB_H_
#define BASE_MESSAGE_PUMP_GLIB_H_
#include <glib.h>
#include "base/message_pump.h"
#include "base/scoped_ptr.h"
#include "base/time.h"
namespace base {
// This class implements a MessagePump needed for TYPE_UI MessageLoops on
// OS_LINUX platforms using GLib.
class MessagePumpForUI : public MessagePump {
public:
MessagePumpForUI();
~MessagePumpForUI();
virtual void Run(Delegate* delegate);
virtual void Quit();
virtual void ScheduleWork();
virtual void ScheduleDelayedWork(const Time& delayed_work_time);
private:
// We may make recursive calls to Run, so we save state that needs to be
// separate between them in this structure type.
struct RunState {
Delegate* delegate;
// Used to flag that the current Run() invocation should return ASAP.
bool should_quit;
// Used to count how many Run() invocations are on the stack.
int run_depth;
};
RunState* state_;
// This is a GLib structure that we can add event sources to. We use the
// default GLib context, which is the one to which all GTK events are
// dispatched.
GMainContext* context_;
// This is the time when we need to do delayed work.
Time delayed_work_time_;
// We use a pipe to schedule work in a thread-safe way that doesn't interfere
// with our state. When ScheduleWork is called, we write into the pipe which
// ensures poll will not sleep, since we use the read end as an event source.
// When we find data pending on the pipe, we clear it out and know we have
// been given new work.
int write_fd_work_scheduled_;
int read_fd_work_scheduled_;
// The work source. It is shared by all calls to Run and destroyed when
// the message pump is destroyed.
GSource* work_source_;
// The GLib poll structure needs to be owned and freed by us.
scoped_ptr<GPollFD> work_source_poll_fd_;
DISALLOW_COPY_AND_ASSIGN(MessagePumpForUI);
};
} // namespace base
#endif // BASE_MESSAGE_PUMP_GLIB_H_
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