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      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
     91