1/*
2 * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
3 * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.com)
4 * Copyright (C) 2016 Konstantin Tokavev <annulen@yandex.ru>
5 * Copyright (C) 2016 Yusuke Suzuki <utatane.tea@gmail.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of Apple Inc. ("Apple") nor the names of
17 * its contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
21 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
22 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
23 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
24 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
25 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
27 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "config.h"
33#include <pthread.h>
34#if HAVE(PTHREAD_NP_H)
35#include <pthread_np.h>
36#endif
37
38#include <wtf/RunLoop.h>
39#if USE(GLIB)
40#include <wtf/glib/RunLoopSourcePriority.h>
41#endif
42
43namespace WTF {
44
45#if !HAVE(PTHREAD_MAIN_NP)
46static pthread_t mainThread;
47#endif
48
49class MainThreadDispatcher {
50public:
51 MainThreadDispatcher()
52 : m_timer(RunLoop::main(), this, &MainThreadDispatcher::fired)
53 {
54#if USE(GLIB)
55 m_timer.setPriority(RunLoopSourcePriority::MainThreadDispatcherTimer);
56#endif
57 }
58
59 void schedule()
60 {
61 m_timer.startOneShot(0_s);
62 }
63
64private:
65 void fired()
66 {
67 dispatchFunctionsFromMainThread();
68 }
69
70 RunLoop::Timer<MainThreadDispatcher> m_timer;
71};
72
73void initializeMainThreadPlatform()
74{
75#if !HAVE(PTHREAD_MAIN_NP)
76 mainThread = pthread_self();
77#endif
78}
79
80bool isMainThread()
81{
82#if HAVE(PTHREAD_MAIN_NP)
83 return pthread_main_np();
84#else
85 return pthread_equal(pthread_self(), mainThread);
86#endif
87}
88
89bool isMainThreadIfInitialized()
90{
91 return isMainThread();
92}
93
94void scheduleDispatchFunctionsOnMainThread()
95{
96 // Use a RunLoop::Timer instead of RunLoop::dispatch() to be able to use a different priority and
97 // avoid the double queue because dispatchOnMainThread also queues the functions.
98 static MainThreadDispatcher dispatcher;
99 dispatcher.schedule();
100}
101
102} // namespace WTF
103