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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
// 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 "base/message_pump.h"
#include "base/observer_list.h"
#include "base/time.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Atomics.h"
typedef struct _GMainContext GMainContext;
typedef struct _GPollFD GPollFD;
typedef struct _GSource GSource;
namespace base {
// This class implements a MessagePump needed for TYPE_UI MessageLoops on
// XP_LINUX platforms using GLib.
class MessagePumpForUI : public MessagePump {
public:
MessagePumpForUI();
virtual ~MessagePumpForUI();
void Run(Delegate* delegate) override;
void Quit() override;
void ScheduleWork() override;
void ScheduleDelayedWork(const TimeTicks& delayed_work_time) override;
// Internal methods used for processing the pump callbacks. They are
// public for simplicity but should not be used directly. HandlePrepare
// is called during the prepare step of glib, and returns a timeout that
// will be passed to the poll. HandleCheck is called after the poll
// has completed, and returns whether or not HandleDispatch should be called.
// HandleDispatch is called if HandleCheck returned true.
int HandlePrepare();
bool HandleCheck();
void HandleDispatch();
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;
// This keeps the state of whether the pump got signaled that there was new
// work to be done. Since we eat the message on the wake up pipe as soon as
// we get it, we keep that state here to stay consistent.
bool has_work;
};
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.
TimeTicks delayed_work_time_;
// The work source. It is shared by all calls to Run and destroyed when
// the message pump is destroyed.
GSource* work_source_;
// We use a wakeup pipe to make sure we'll get out of the glib polling phase
// when another thread has scheduled us to do some work. There is a glib
// mechanism g_main_context_wakeup, but this won't guarantee that our event's
// Dispatch() will be called.
int wakeup_pipe_read_;
int wakeup_pipe_write_;
// Use an autoptr to avoid needing the definition of GPollFD in the header.
mozilla::UniquePtr<GPollFD> wakeup_gpollfd_;
mozilla::Atomic<bool> pipe_full_;
DISALLOW_COPY_AND_ASSIGN(MessagePumpForUI);
};
} // namespace base
#endif // BASE_MESSAGE_PUMP_GLIB_H_
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