blob: d79dba55a2a045715650439f977fd4b96a5be75b [file] [log] [blame]
// 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.
#include <memory>
#include "base/base_export.h"
#include "base/macros.h"
#include "base/message_loop/message_pump.h"
#include "base/observer_list.h"
#include "base/time/time.h"
typedef struct _GMainContext GMainContext;
typedef struct _GPollFD GPollFD;
typedef struct _GSource GSource;
namespace base {
// This class implements a base MessagePump needed for TYPE_UI MessageLoops on
// platforms using GLib.
class BASE_EXPORT MessagePumpGlib : public MessagePump {
~MessagePumpGlib() 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();
// Overridden from MessagePump:
void Run(Delegate* delegate) override;
void Quit() override;
void ScheduleWork() override;
void ScheduleDelayedWork(const TimeTicks& delayed_work_time) override;
bool ShouldQuit() const;
// We may make recursive calls to Run, so we save state that needs to be
// separate between them in this structure type.
struct RunState;
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 a unique_ptr to avoid needing the definition of GPollFD in the header.
std::unique_ptr<GPollFD> wakeup_gpollfd_;
} // namespace base