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