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 39 V8GCForContextDispose::V8GCForContextDispose() 40 : m_pseudoIdleTimer(this, &V8GCForContextDispose::pseudoIdleTimerFired) 41 , m_didDisposeContextForMainFrame(false) 42 { 43 } 44 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 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 64 V8GCForContextDispose& V8GCForContextDispose::instanceTemplate() 65 { 66 DEFINE_STATIC_LOCAL(V8GCForContextDispose, staticInstance, ()); 67 return staticInstance; 68 } 69 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