blob: d25ae86aee865440cb6c1d8b8f23b9f20cfaa973 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
// 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/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);
// 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. HandleDispatch is called after the poll
// has completed.
int HandlePrepare();
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;
// Used internally for controlling whether we want a message pump
// iteration to be blocking or not.
bool more_work_is_plausible;
};
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_;
// 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_;
GPollFD wakeup_gpollfd_;
DISALLOW_COPY_AND_ASSIGN(MessagePumpForUI);
};
} // namespace base
#endif // BASE_MESSAGE_PUMP_GLIB_H_
|
