1/*
2 * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
3 * Copyright (C) 2007 Justin Haygood ([email protected])
4 * Copyright (C) 2016 Konstantin Tokavev <[email protected]>
5 * Copyright (C) 2016 Yusuke Suzuki <[email protected]>
6 * Copyright (C) 2019 Oracle and/or its affiliates. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of Apple Inc. ("Apple") nor the names of
18 * its contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
22 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
25 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
26 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
28 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include "config.h"
34#include <pthread.h>
35#if HAVE(PTHREAD_NP_H)
36#include <pthread_np.h>
37#endif
38
39#include <wtf/RunLoop.h>
40#include <wtf/NeverDestroyed.h>
41#if USE(GLIB)
42#include <wtf/glib/RunLoopSourcePriority.h>
43#endif
44
45namespace WTF {
46
47#if !HAVE(PTHREAD_MAIN_NP)
48static pthread_t mainThread;
49#endif
50
51class MainThreadDispatcher {
52 WTF_MAKE_FAST_ALLOCATED;
53public:
54 MainThreadDispatcher()
55 : m_timer(RunLoop::main(), this, &MainThreadDispatcher::fired)
56 {
57#if USE(GLIB)
58 m_timer.setPriority(RunLoopSourcePriority::MainThreadDispatcherTimer);
59#endif
60 }
61
62 void schedule()
63 {
64 m_timer.startOneShot(0_s);
65 }
66
67private:
68 void fired()
69 {
70 dispatchFunctionsFromMainThread();
71 }
72
73 RunLoop::Timer<MainThreadDispatcher> m_timer;
74};
75
76void initializeMainThreadPlatform()
77{
78#if !HAVE(PTHREAD_MAIN_NP)
79 mainThread = pthread_self();
80#endif
81}
82
83bool isMainThread()
84{
85#if HAVE(PTHREAD_MAIN_NP)
86 return pthread_main_np();
87#else
88 return pthread_equal(pthread_self(), mainThread);
89#endif
90}
91
92void scheduleDispatchFunctionsOnMainThread()
93{
94 // Use a RunLoop::Timer instead of RunLoop::dispatch() to be able to use a different priority and
95 // avoid the double queue because dispatchOnMainThread also queues the functions.
96 static NeverDestroyed<MainThreadDispatcher> dispatcher;
97 dispatcher.get().schedule();
98}
99
100} // namespace WTF
101