wtf/win/MainThreadWin.cpp

   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
  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
  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
  72 void scheduleDispatchFunctionsOnMainThread()
  73 {
  74     ASSERT(threadingWindowHandle);
  75     PostMessage(threadingWindowHandle, threadingFiredMessage, 0, 0);
  76 }
  77
  78 } // namespace WebCore