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 36 namespace WebCore { 37 38 V8GCForContextDispose::V8GCForContextDispose() 39 : m_pseudoIdleTimer(this, &V8GCForContextDispose::pseudoIdleTimerFired) 40 , m_didDisposeContextForMainFrame(false) 41 { 42 } 43 44 void V8GCForContextDispose::notifyContextDisposed(bool isMainFrame) 45 { 46 m_didDisposeContextForMainFrame = m_didDisposeContextForMainFrame || isMainFrame; 47 v8::V8::ContextDisposedNotification(); 48 if (!m_pseudoIdleTimer.isActive()) 49 m_pseudoIdleTimer.startOneShot(0.8); 50 } 51 52 void V8GCForContextDispose::notifyIdleSooner(double maximumFireInterval) 53 { 54 if (m_pseudoIdleTimer.isActive()) { 55 double nextFireInterval = m_pseudoIdleTimer.nextFireInterval(); 56 if (nextFireInterval > maximumFireInterval) { 57 m_pseudoIdleTimer.stop(); 58 m_pseudoIdleTimer.startOneShot(maximumFireInterval); 59 } 60 } 61 } 62 63 V8GCForContextDispose& V8GCForContextDispose::instance() 64 { 65 DEFINE_STATIC_LOCAL(V8GCForContextDispose, staticInstance, ()); 66 return staticInstance; 67 } 68 69 void V8GCForContextDispose::pseudoIdleTimerFired(Timer<V8GCForContextDispose>*) 70 { 71 const int longIdlePauseInMs = 1000; 72 const int shortIdlePauseInMs = 10; 73 int hint = m_didDisposeContextForMainFrame ? longIdlePauseInMs : shortIdlePauseInMs; 74 v8::V8::IdleNotification(hint); 75 m_didDisposeContextForMainFrame = false; 76 } 77 78 } // namespace WebCore 79