runtime/WatchdogMac.cpp

   1 /*
   2  * Copyright (C) 2013 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. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "Watchdog.h"
  28
  29 namespace JSC {
  30
  31 void Watchdog::initTimer()
  32 {
  33     m_queue = 0;
  34     m_timer = 0;
  35 }
  36
  37 void Watchdog::destroyTimer()
  38 {
  39     ASSERT(!m_timer);
  40     if (m_queue)
  41         dispatch_release(m_queue);
  42 }
  43
  44 void Watchdog::startTimer(double limit)
  45 {
  46     ASSERT(!m_timer);
  47     if (!m_queue)
  48         m_queue = dispatch_queue_create("jsc.watchdog.queue", 0);
  49     m_timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, m_queue);
  50
  51     dispatch_source_set_timer(m_timer,
  52         dispatch_time(DISPATCH_TIME_NOW, limit * NSEC_PER_SEC),
  53         DISPATCH_TIME_FOREVER, 0);
  54
  55     dispatch_source_set_event_handler(m_timer, ^{
  56         m_timerDidFire = true;
  57     });
  58
  59     dispatch_resume(m_timer);
  60 }
  61
  62 void Watchdog::stopTimer()
  63 {
  64     ASSERT(m_queue);
  65     dispatch_sync(m_queue, ^{
  66         dispatch_source_cancel(m_timer);
  67     });
  68     dispatch_release(m_timer);
  69     m_timer = 0;
  70 }
  71
  72 } // namespace JSC