1 /*
2 * Copyright (C) 2010 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "config.h"
27 #include "ResponsivenessTimer.h"
28
29 #include "WorkItem.h"
30
31 namespace WebKit {
32
33 static const double kResponsivenessTimeout = 3;
34
ResponsivenessTimer(ResponsivenessTimer::Client * client)35 ResponsivenessTimer::ResponsivenessTimer(ResponsivenessTimer::Client* client)
36 : m_client(client)
37 , m_isResponsive(true)
38 , m_timer(RunLoop::main(), this, &ResponsivenessTimer::timerFired)
39 {
40 }
41
~ResponsivenessTimer()42 ResponsivenessTimer::~ResponsivenessTimer()
43 {
44 m_timer.stop();
45 }
46
invalidate()47 void ResponsivenessTimer::invalidate()
48 {
49 m_timer.stop();
50 }
51
timerFired()52 void ResponsivenessTimer::timerFired()
53 {
54 // We'll never schedule the timer unless we're responsive.
55 ASSERT(m_isResponsive);
56
57 m_isResponsive = false;
58 m_client->didBecomeUnresponsive(this);
59
60 m_timer.stop();
61 }
62
start()63 void ResponsivenessTimer::start()
64 {
65 if (m_timer.isActive())
66 return;
67
68 if (!m_isResponsive)
69 return;
70
71 m_timer.startOneShot(kResponsivenessTimeout);
72 }
73
stop()74 void ResponsivenessTimer::stop()
75 {
76 if (!m_isResponsive) {
77 // We got a life sign from the web process!
78 m_client->didBecomeResponsive(this);
79 m_isResponsive = true;
80 }
81
82 m_timer.stop();
83 }
84
85 } // namespace WebKit
86