1 | /* |
2 | * Copyright (C) 2012, 2015 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 | #pragma once |
27 | |
28 | #if ENABLE(ASYNC_SCROLLING) |
29 | |
30 | #include <functional> |
31 | #include <wtf/Condition.h> |
32 | #include <wtf/Forward.h> |
33 | #include <wtf/Function.h> |
34 | #include <wtf/Lock.h> |
35 | #include <wtf/Noncopyable.h> |
36 | #include <wtf/Threading.h> |
37 | #include <wtf/Vector.h> |
38 | |
39 | #if PLATFORM(COCOA) |
40 | #include <wtf/RetainPtr.h> |
41 | #else |
42 | #include <wtf/RunLoop.h> |
43 | #endif |
44 | |
45 | namespace WebCore { |
46 | |
47 | class ScrollingThread { |
48 | WTF_MAKE_NONCOPYABLE(ScrollingThread); |
49 | |
50 | public: |
51 | static bool isCurrentThread(); |
52 | WEBCORE_EXPORT static void dispatch(Function<void ()>&&); |
53 | |
54 | // Will dispatch the given function on the main thread once all pending functions |
55 | // on the scrolling thread have finished executing. Used for synchronization purposes. |
56 | WEBCORE_EXPORT static void dispatchBarrier(Function<void ()>&&); |
57 | |
58 | private: |
59 | friend NeverDestroyed<ScrollingThread>; |
60 | |
61 | ScrollingThread(); |
62 | |
63 | static ScrollingThread& singleton(); |
64 | |
65 | void createThreadIfNeeded(); |
66 | void dispatchFunctionsFromScrollingThread(); |
67 | |
68 | void initializeRunLoop(); |
69 | void wakeUpRunLoop(); |
70 | |
71 | #if PLATFORM(COCOA) |
72 | static void threadRunLoopSourceCallback(void* scrollingThread); |
73 | void threadRunLoopSourceCallback(); |
74 | #endif |
75 | |
76 | RefPtr<Thread> m_thread; |
77 | |
78 | Condition m_initializeRunLoopConditionVariable; |
79 | Lock m_initializeRunLoopMutex; |
80 | |
81 | Lock m_functionsMutex; |
82 | Vector<Function<void ()>> m_functions; |
83 | |
84 | #if PLATFORM(COCOA) |
85 | // FIXME: We should use WebCore::RunLoop here. |
86 | RetainPtr<CFRunLoopRef> m_threadRunLoop; |
87 | RetainPtr<CFRunLoopSourceRef> m_threadRunLoopSource; |
88 | #else |
89 | RunLoop* m_runLoop { nullptr }; |
90 | #endif |
91 | }; |
92 | |
93 | } // namespace WebCore |
94 | |
95 | #endif // ENABLE(ASYNC_SCROLLING) |
96 | |