1 /*
2 * Copyright (C) 2010 Google 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 are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "config.h"
32 #include "bindings/v8/V8GCForContextDispose.h"
33
34 #include "wtf/StdLibExtras.h"
35 #include <v8.h>
36
37 namespace WebCore {
38
V8GCForContextDispose()39 V8GCForContextDispose::V8GCForContextDispose()
40 : m_pseudoIdleTimer(this, &V8GCForContextDispose::pseudoIdleTimerFired)
41 , m_didDisposeContextForMainFrame(false)
42 {
43 }
44
notifyContextDisposed(bool isMainFrame)45 void V8GCForContextDispose::notifyContextDisposed(bool isMainFrame)
46 {
47 m_didDisposeContextForMainFrame = m_didDisposeContextForMainFrame || isMainFrame;
48 v8::V8::ContextDisposedNotification();
49 if (!m_pseudoIdleTimer.isActive())
50 m_pseudoIdleTimer.startOneShot(0.8, FROM_HERE);
51 }
52
notifyIdleSooner(double maximumFireInterval)53 void V8GCForContextDispose::notifyIdleSooner(double maximumFireInterval)
54 {
55 if (m_pseudoIdleTimer.isActive()) {
56 double nextFireInterval = m_pseudoIdleTimer.nextFireInterval();
57 if (nextFireInterval > maximumFireInterval) {
58 m_pseudoIdleTimer.stop();
59 m_pseudoIdleTimer.startOneShot(maximumFireInterval, FROM_HERE);
60 }
61 }
62 }
63
instanceTemplate()64 V8GCForContextDispose& V8GCForContextDispose::instanceTemplate()
65 {
66 DEFINE_STATIC_LOCAL(V8GCForContextDispose, staticInstance, ());
67 return staticInstance;
68 }
69
pseudoIdleTimerFired(Timer<V8GCForContextDispose> *)70 void V8GCForContextDispose::pseudoIdleTimerFired(Timer<V8GCForContextDispose>*)
71 {
72 const int longIdlePauseInMs = 1000;
73 const int shortIdlePauseInMs = 10;
74 int hint = m_didDisposeContextForMainFrame ? longIdlePauseInMs : shortIdlePauseInMs;
75 v8::V8::IdleNotification(hint);
76 m_didDisposeContextForMainFrame = false;
77 }
78
79 } // namespace WebCore
80