1/*
2 * Copyright (C) 2009 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 "LoaderRunLoopCF.h"
28
29#if USE(CFNETWORK)
30
31#include <CoreFoundation/CoreFoundation.h>
32#include <condition_variable>
33#include <limits>
34#include <wtf/AutodrainedPool.h>
35#include <wtf/MainThread.h>
36#include <wtf/NeverDestroyed.h>
37#include <wtf/Threading.h>
38
39namespace WebCore {
40
41static CFRunLoopRef loaderRunLoopObject = 0;
42
43static std::mutex& loaderRunLoopMutex()
44{
45    static NeverDestroyed<std::mutex> mutex;
46
47    return mutex;
48}
49
50static std::condition_variable& loaderRunLoopConditionVariable()
51{
52    static NeverDestroyed<std::condition_variable> conditionVariable;
53
54    return conditionVariable;
55}
56
57static void emptyPerform(void*)
58{
59}
60
61static void runLoaderThread(void*)
62{
63    {
64        std::lock_guard<std::mutex> lock(loaderRunLoopMutex());
65
66        loaderRunLoopObject = CFRunLoopGetCurrent();
67
68        // Must add a source to the run loop to prevent CFRunLoopRun() from exiting.
69        CFRunLoopSourceContext ctxt = {0, (void*)1 /*must be non-null*/, 0, 0, 0, 0, 0, 0, 0, emptyPerform};
70        CFRunLoopSourceRef bogusSource = CFRunLoopSourceCreate(0, 0, &ctxt);
71        CFRunLoopAddSource(loaderRunLoopObject, bogusSource, kCFRunLoopDefaultMode);
72
73        loaderRunLoopConditionVariable().notify_one();
74    }
75
76    SInt32 result;
77    do {
78        AutodrainedPool pool;
79        result = CFRunLoopRunInMode(kCFRunLoopDefaultMode, std::numeric_limits<double>::max(), true);
80    } while (result != kCFRunLoopRunStopped && result != kCFRunLoopRunFinished);
81}
82
83CFRunLoopRef loaderRunLoop()
84{
85    ASSERT(isMainThread());
86
87    std::unique_lock<std::mutex> lock(loaderRunLoopMutex());
88
89    if (!loaderRunLoopObject) {
90        createThread(runLoaderThread, 0, "WebCore: CFNetwork Loader");
91
92        loaderRunLoopConditionVariable().wait(lock, [] { return loaderRunLoopObject; });
93    }
94
95    return loaderRunLoopObject;
96}
97
98} // namespace WebCore
99
100#endif // USE(CFNETWORK)
101