wtf/win/MainThreadWin.cpp

   1 /*
   2  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
   3  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1.  Redistributions of source code must retain the above copyright
  10  *     notice, this list of conditions and the following disclaimer.
  11  * 2.  Redistributions in binary form must reproduce the above copyright
  12  *     notice, this list of conditions and the following disclaimer in the
  13  *     documentation and/or other materials provided with the distribution.
  14  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  15  *     its contributors may be used to endorse or promote products derived
  16  *     from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  25  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include "config.h"
  31 #include "MainThread.h"
  32
  33 #include "Assertions.h"
  34 #include "Threading.h"
  35 #if !OS(WINCE)
  36 #include <windows.h>
  37 #endif
  38
  39 namespace WTF {
  40
  41 static HWND threadingWindowHandle;
  42 static UINT threadingFiredMessage;
  43 const LPCWSTR kThreadingWindowClassName = L"ThreadingWindowClass";
  44
  45 LRESULT CALLBACK ThreadingWindowWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
  46 {
  47     if (message == threadingFiredMessage)
  48         dispatchFunctionsFromMainThread();
  49     else
  50         return DefWindowProc(hWnd, message, wParam, lParam);
  51     return 0;
  52 }
  53
  54 void initializeMainThreadPlatform()
  55 {
  56     if (threadingWindowHandle)
  57         return;
  58
  59     HWND hWndParent = 0;
  60 #if OS(WINCE)
  61     WNDCLASS wcex;
  62     memset(&wcex, 0, sizeof(WNDCLASS));
  63 #else
  64     WNDCLASSEX wcex;
  65     memset(&wcex, 0, sizeof(WNDCLASSEX));
  66     wcex.cbSize = sizeof(WNDCLASSEX);
  67 #endif
  68     wcex.lpfnWndProc    = ThreadingWindowWndProc;
  69     wcex.lpszClassName  = kThreadingWindowClassName;
  70 #if OS(WINCE)
  71     RegisterClass(&wcex);
  72 #else
  73     RegisterClassEx(&wcex);
  74     hWndParent = HWND_MESSAGE;
  75 #endif
  76
  77     threadingWindowHandle = CreateWindow(kThreadingWindowClassName, 0, 0,
  78        CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, hWndParent, 0, 0, 0);
  79     threadingFiredMessage = RegisterWindowMessage(L"com.apple.WebKit.MainThreadFired");
  80
  81     initializeCurrentThreadInternal("Main Thread");
  82 }
  83
  84 void scheduleDispatchFunctionsOnMainThread()
  85 {
  86     ASSERT(threadingWindowHandle);
  87     PostMessage(threadingWindowHandle, threadingFiredMessage, 0, 0);
  88 }
  89
  90 } // namespace WTF