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
29namespace JSC {
30
31void Watchdog::initTimer()
32{
33    m_queue = 0;
34    m_timer = 0;
35}
36
37void Watchdog::destroyTimer()
38{
39    ASSERT(!m_timer);
40    if (m_queue)
41        dispatch_release(m_queue);
42}
43
44void 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
62void 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
73