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 31namespace WebKit { 32 33static const double kResponsivenessTimeout = 3; 34 35ResponsivenessTimer::ResponsivenessTimer(ResponsivenessTimer::Client* client) 36 : m_client(client) 37 , m_isResponsive(true) 38 , m_timer(RunLoop::main(), this, &ResponsivenessTimer::timerFired) 39{ 40} 41 42ResponsivenessTimer::~ResponsivenessTimer() 43{ 44 m_timer.stop(); 45} 46 47void ResponsivenessTimer::invalidate() 48{ 49 m_timer.stop(); 50} 51 52void 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 63void 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 74void 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