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 "ChildProcess.h"
28
29#if !OS(WINDOWS)
30#include <unistd.h>
31#endif
32
33namespace WebKit {
34
35void ChildProcess::disableTermination()
36{
37    m_terminationCounter++;
38    m_terminationTimer.stop();
39}
40
41void ChildProcess::enableTermination()
42{
43    ASSERT(m_terminationCounter > 0);
44    m_terminationCounter--;
45
46    if (m_terminationCounter)
47        return;
48
49    if (!m_terminationTimeout) {
50        terminationTimerFired();
51        return;
52    }
53
54    m_terminationTimer.startOneShot(m_terminationTimeout);
55}
56
57ChildProcess::ChildProcess(double terminationTimeout)
58    : m_terminationTimeout(terminationTimeout)
59    , m_terminationCounter(0)
60    , m_terminationTimer(RunLoop::main(), this, &ChildProcess::terminationTimerFired)
61{
62    // FIXME: The termination timer should not be scheduled on the main run loop.
63    // It won't work with the threaded mode, but it's not really useful anyway as is.
64}
65
66ChildProcess::~ChildProcess()
67{
68}
69
70void ChildProcess::terminationTimerFired()
71{
72    if (!shouldTerminate())
73        return;
74
75    terminate();
76}
77
78void ChildProcess::terminate()
79{
80    RunLoop::main()->stop();
81}
82
83NO_RETURN static void watchdogCallback()
84{
85    // We use _exit here since the watchdog callback is called from another thread and we don't want
86    // global destructors or atexit handlers to be called from this thread while the main thread is busy
87    // doing its thing.
88    _exit(EXIT_FAILURE);
89}
90
91void ChildProcess::didCloseOnConnectionWorkQueue(WorkQueue& workQueue, CoreIPC::Connection*)
92{
93    // If the connection has been closed and we haven't responded in the main thread for 10 seconds
94    // the process will exit forcibly.
95    static const double watchdogDelay = 10.0;
96
97    workQueue.scheduleWorkAfterDelay(WorkItem::create(watchdogCallback), watchdogDelay);
98}
99
100} // namespace WebKit
101