| /* |
| * Copyright (C) 2010, 2012 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "ResponsivenessTimer.h" |
| |
| namespace WebKit { |
| |
| ResponsivenessTimer::ResponsivenessTimer(ResponsivenessTimer::Client& client, Seconds responsivenessTimeout) |
| : m_client(client) |
| , m_timer(RunLoop::main(), this, &ResponsivenessTimer::timerFired) |
| , m_responsivenessTimeout(responsivenessTimeout) |
| { |
| } |
| |
| ResponsivenessTimer::~ResponsivenessTimer() = default; |
| |
| void ResponsivenessTimer::invalidate() |
| { |
| m_timer.stop(); |
| m_restartFireTime = MonotonicTime(); |
| m_waitingForTimer = false; |
| m_useLazyStop = false; |
| } |
| |
| void ResponsivenessTimer::timerFired() |
| { |
| if (!m_waitingForTimer) |
| return; |
| |
| if (m_restartFireTime) { |
| MonotonicTime now = MonotonicTime::now(); |
| MonotonicTime restartFireTime = m_restartFireTime; |
| m_restartFireTime = MonotonicTime(); |
| |
| if (restartFireTime > now) { |
| m_timer.startOneShot(restartFireTime - now); |
| return; |
| } |
| } |
| |
| m_waitingForTimer = false; |
| m_useLazyStop = false; |
| |
| if (!m_isResponsive) |
| return; |
| |
| Ref protectedClient { m_client }; |
| |
| if (!mayBecomeUnresponsive()) { |
| m_waitingForTimer = true; |
| m_timer.startOneShot(m_responsivenessTimeout); |
| return; |
| } |
| |
| m_client.willChangeIsResponsive(); |
| m_isResponsive = false; |
| m_client.didChangeIsResponsive(); |
| |
| m_client.didBecomeUnresponsive(); |
| } |
| |
| void ResponsivenessTimer::start() |
| { |
| if (m_waitingForTimer) |
| return; |
| |
| m_waitingForTimer = true; |
| m_useLazyStop = false; |
| |
| if (m_timer.isActive()) { |
| // The timer is still active from a lazy stop. |
| // Instead of restarting the timer, we schedule a new delay after this one finishes. |
| // |
| // In most cases, stop is called before we get to schedule the second timer, saving us |
| // the scheduling of the timer entirely. |
| m_restartFireTime = MonotonicTime::now() + m_responsivenessTimeout; |
| } else { |
| m_restartFireTime = MonotonicTime(); |
| m_timer.startOneShot(m_responsivenessTimeout); |
| } |
| } |
| |
| bool ResponsivenessTimer::mayBecomeUnresponsive() const |
| { |
| #if !defined(NDEBUG) || ASAN_ENABLED |
| return false; |
| #else |
| static bool isLibgmallocEnabled = [] { |
| char* variable = getenv("DYLD_INSERT_LIBRARIES"); |
| if (!variable) |
| return false; |
| if (!strstr(variable, "libgmalloc")) |
| return false; |
| return true; |
| }(); |
| if (isLibgmallocEnabled) |
| return false; |
| |
| return m_client.mayBecomeUnresponsive(); |
| #endif |
| } |
| |
| void ResponsivenessTimer::startWithLazyStop() |
| { |
| if (!m_waitingForTimer) { |
| start(); |
| m_useLazyStop = true; |
| } |
| } |
| |
| void ResponsivenessTimer::stop() |
| { |
| if (!m_isResponsive) { |
| Ref protectedClient { m_client }; |
| |
| // We got a life sign from the web process. |
| m_client.willChangeIsResponsive(); |
| m_isResponsive = true; |
| m_client.didChangeIsResponsive(); |
| |
| m_client.didBecomeResponsive(); |
| } |
| |
| m_waitingForTimer = false; |
| |
| if (m_useLazyStop) |
| m_useLazyStop = false; |
| else |
| m_timer.stop(); |
| } |
| |
| void ResponsivenessTimer::processTerminated() |
| { |
| invalidate(); |
| } |
| |
| } // namespace WebKit |