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will not use any value from WM_USER upward for its own messages so you
can use the value WM_USER and above as your own custom message value.</font></font></font>
<br><font face="Arial,Helvetica"><font color="#FFFFFF"><font size=-1>If
one of the thread is a user interface thread and the other is a worker
one, you cannot use this method as two-way communication since a worker
thread doesn't have its own window so it doesn't have a message queue.
You can use the following scheme:</font></font></font><font face="Arial,Helvetica"><font size=-1></font></font>
<p><font face="Arial,Helvetica"><font color="#FFFFFF"><font size=-1>
User interface Thread ------> global variable(s)----> Worker thread</font></font></font>
<br><font face="Arial,Helvetica"><font color="#FFFFFF"><font size=-1>
Worker Thread ------> custom window message(s) ----> User interface
Thread</font></font></font><font face="Arial,Helvetica"><font size=-1></font></font>
<p><font face="Arial,Helvetica"><font color="#FFFFFF"><font size=-1>In
fact, we will use this method in our example.</font></font></font>
<br><font face="Arial,Helvetica"><font color="#FFFFFF"><font size=-1>The
last communication method is an event object. You can view an event object
as a kind of flag. If the event object is in "unsignalled" state, the thread
is dormant or sleeping, in this state, the thread doesn't receive CPU time
slice. When the event object is in "signalled" state,Windows "wakes up"
the thread and it starts performing the assigned task.</font></font></font>
<h3>
<font face="Arial,Helvetica"><font color="#33FF33"><font size=+0>Example:</font></font></font></h3>
<font face="Arial,Helvetica"><font color="#FFFFFF"><font size=-1>You should
download the example zip file and run thread1.exe. Click the "Savage Calculation"
menu item. This will instruct the program to perform "add eax,eax " for
600,000,000 times. Note that during that time, you cannot do anything with
the main window: you cannot move it, you cannot activate its menu, etc.
When the calculation is completed, a message box appears. After that the
window accepts your command normally.</font></font></font>
<br><font face="Arial,Helvetica"><font color="#FFFFFF"><font size=-1>To
avoid this type of inconveniece to the user, we can move the "calculation"
routine into a separate worker thread and let the primary thread continue
with its user interface task. You can see that even though the main window
responds more slowly than usual, it still responds</font></font></font><font face="Arial,Helvetica"><font size=-1></font></font>
<p><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>.386</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>.model
flat,stdcall</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>option
casemap:none</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>WinMain
proto :DWORD,:DWORD,:DWORD,:DWORD</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>include
\masm32\include\windows.inc</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>include
\masm32\include\user32.inc</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>include
\masm32\include\kernel32.inc</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>includelib
\masm32\lib\user32.lib</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>includelib
\masm32\lib\kernel32.lib</font></font></font></b><font face="Arial,Helvetica"><font size=-1></font></font>
<p><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>.const</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>IDM_CREATE_THREAD
equ 1</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>IDM_EXIT
equ 2</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>WM_FINISH
equ WM_USER+100h</font></font></font></b><font face="Arial,Helvetica"><font size=-1></font></font>
<p><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>.data</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>ClassName
db "Win32ASMThreadClass",0</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>AppName
db "Win32 ASM MultiThreading Example",0</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>MenuName
db "FirstMenu",0</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>SuccessString
db "The calculation is completed!",0</font></font></font></b><font face="Arial,Helvetica"><font size=-1></font></font>
<p><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>.data?</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>hInstance
HINSTANCE ?</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>CommandLine
LPSTR ?</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>hwnd
HANDLE ?</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#66FF99"><font size=-1>ThreadID
DWORD ?</font></font></font></b><font face="Arial,Helvetica"><font size=-1></font></font>
<p><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>.code</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>start:</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
invoke GetModuleHandle, NULL</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
mov hInstance,eax</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
invoke GetCommandLine</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
mov CommandLine,eax</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
invoke WinMain, hInstance,NULL,CommandLine, SW_SHOWDEFAULT</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
invoke ExitProcess,eax</font></font></font></b><font face="Arial,Helvetica"><font size=-1></font></font>
<p><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>WinMain
proc hInst:HINSTANCE,hPrevInst:HINSTANCE,CmdLine:LPSTR,CmdShow:DWORD</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
LOCAL wc:WNDCLASSEX</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
LOCAL msg:MSG</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
mov wc.cbSize,SIZEOF WNDCLASSEX</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
mov wc.style, CS_HREDRAW or CS_VREDRAW</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
mov wc.lpfnWndProc, OFFSET WndProc</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
mov wc.cbClsExtra,NULL</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
mov wc.cbWndExtra,NULL</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
push hInst</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
pop wc.hInstance</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
mov wc.hbrBackground,COLOR_WINDOW+1</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
mov wc.lpszMenuName,OFFSET MenuName</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
mov wc.lpszClassName,OFFSET ClassName</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
invoke LoadIcon,NULL,IDI_APPLICATION</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
mov wc.hIcon,eax</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
mov wc.hIconSm,eax</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
invoke LoadCursor,NULL,IDC_ARROW</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
mov wc.hCursor,eax</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
invoke RegisterClassEx, addr wc</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
invoke CreateWindowEx,WS_EX_CLIENTEDGE,ADDR ClassName,ADDR AppName,\</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,\</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
CW_USEDEFAULT,300,200,NULL,NULL,\</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
hInst,NULL</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
mov hwnd,eax</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
invoke ShowWindow, hwnd,SW_SHOWNORMAL</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
invoke UpdateWindow, hwnd</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
.WHILE TRUE</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
invoke GetMessage, ADDR msg,NULL,0,0</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
.BREAK .IF (!eax)</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
invoke TranslateMessage, ADDR msg</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
invoke DispatchMessage, ADDR msg</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
.ENDW</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
mov eax,msg.wParam</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
ret</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>WinMain
endp</font></font></font></b><font face="Arial,Helvetica"><font size=-1></font></font>
<p><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>WndProc
proc hWnd:HWND, uMsg:UINT, wParam:WPARAM, lParam:LPARAM</font></font></font></b>
<br><b><font face="Arial,Helvetica"><font color="#FFFFCC"><font size=-1>
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