1 /*
2 * Copyright (C) 2007, 2008 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 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 * its contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "config.h"
30 #include "MainThread.h"
31
32 #include "Assertions.h"
33 #include "Threading.h"
34 #if !PLATFORM(WIN_CE)
35 #include <windows.h>
36 #endif
37
38 namespace WTF {
39
40 static HWND threadingWindowHandle;
41 static UINT threadingFiredMessage;
42 const LPCWSTR kThreadingWindowClassName = L"ThreadingWindowClass";
43
ThreadingWindowWndProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam)44 LRESULT CALLBACK ThreadingWindowWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
45 {
46 if (message == threadingFiredMessage)
47 dispatchFunctionsFromMainThread();
48 else
49 return DefWindowProc(hWnd, message, wParam, lParam);
50 return 0;
51 }
52
initializeMainThread()53 void initializeMainThread()
54 {
55 if (threadingWindowHandle)
56 return;
57
58 mainThreadFunctionQueueMutex();
59
60 WNDCLASSEX wcex;
61 memset(&wcex, 0, sizeof(WNDCLASSEX));
62 wcex.cbSize = sizeof(WNDCLASSEX);
63 wcex.lpfnWndProc = ThreadingWindowWndProc;
64 wcex.lpszClassName = kThreadingWindowClassName;
65 RegisterClassEx(&wcex);
66
67 threadingWindowHandle = CreateWindow(kThreadingWindowClassName, 0, 0,
68 CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, HWND_MESSAGE, 0, 0, 0);
69 threadingFiredMessage = RegisterWindowMessage(L"com.apple.WebKit.MainThreadFired");
70 }
71
scheduleDispatchFunctionsOnMainThread()72 void scheduleDispatchFunctionsOnMainThread()
73 {
74 ASSERT(threadingWindowHandle);
75 PostMessage(threadingWindowHandle, threadingFiredMessage, 0, 0);
76 }
77
78 } // namespace WebCore
79