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Threads in a console app

How does one "fork" a new process using MFC in a console app? I know the call is AfxStartThread(), but all the examples I can find are Windows based!!! Code sample would be greatly appreciated.

andy t.
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tudhopea
Asked:
tudhopea
1 Solution
 
jhanceCommented:
The Windows Win32 API doesn't provide fork() so you can't do it that way.  Use the C-runtime function _beginthread().  On it's man page in the SDK documentation, you will find the following example:

/* BEGTHRD.C illustrates multiple threads using functions: *
 *      _beginthread            _endthread * *
 * This program requires the multithreaded library. For example,
 * compile with the following command line: *     CL /MT /D "_X86_" BEGTHRD.C *
 * If you are using the Visual C++ development environment, select the
 * Multi-Threaded runtime library in the compiler Project Settings
 * dialog box. *  */#include <windows.h>
#include <process.h>    /* _beginthread, _endthread */#include <stddef.h>
#include <stdlib.h>#include <conio.h>void Bounce( void *ch );
void CheckKey( void *dummy );
/* GetRandom returns a random integer between min and max. */
#define GetRandom( min, max ) ((rand() % (int)(((max) + 1) - (min))) + (min))
BOOL repeat = TRUE;     /* Global repeat flag and video variable */
HANDLE hStdOut;         /* Handle for console window */
CONSOLE_SCREEN_BUFFER_INFO csbi;    /* Console information structure */
void main(){    CHAR    ch = 'A';
    hStdOut = GetStdHandle( STD_OUTPUT_HANDLE );
    /* Get display screen's text row and column information. */
   GetConsoleScreenBufferInfo( hStdOut, &csbi );
    /* Launch CheckKey thread to check for terminating keystroke. */
    _beginthread( CheckKey, 0, NULL );
    /* Loop until CheckKey terminates program. */    while( repeat )    {
        /* On first loops, launch character threads. */
        _beginthread( Bounce, 0, (void *) (ch++)  );
        /* Wait one second between loops. */        Sleep( 1000L );    }}
/* CheckKey - Thread to wait for a keystroke, then clear repeat flag. */
void CheckKey( void *dummy ){    _getch();
    repeat = 0;    /* _endthread implied */}
/* Bounce - Thread to create and and control a colored letter that moves
 * around on the screen. * * Params: ch - the letter to be moved */
void Bounce( void *ch ){
    /* Generate letter and color attribute from thread argument. */
    char    blankcell = 0x20;    char    blockcell = (char) ch;
    BOOL    first = TRUE;   COORD   oldcoord, newcoord;   DWORD   result;
    /* Seed random number generator and get initial location. */
    srand( _threadid );    newcoord.X = GetRandom( 0, csbi.dwSize.X - 1 );
    newcoord.Y = GetRandom( 0, csbi.dwSize.Y - 1 );    while( repeat )    {
        /* Pause between loops. */        Sleep( 100L );
        /* Blank out our old position on the screen, and draw new letter. */
        if( first )            first = FALSE;        else
         WriteConsoleOutputCharacter( hStdOut, &blankcell, 1, oldcoord, &result );
         WriteConsoleOutputCharacter( hStdOut, &blockcell, 1, newcoord, &result );
        /* Increment the coordinate for next placement of the block. */
        oldcoord.X = newcoord.X;        oldcoord.Y = newcoord.Y;
        newcoord.X += GetRandom( -1, 1 );
        newcoord.Y += GetRandom( -1, 1 );
        /* Correct placement (and beep) if about to go off the screen. */
        if( newcoord.X < 0 )            newcoord.X = 1;
        else if( newcoord.X == csbi.dwSize.X )
            newcoord.X = csbi.dwSize.X - 2;        else if( newcoord.Y < 0 )
            newcoord.Y = 1;        else if( newcoord.Y == csbi.dwSize.Y )
            newcoord.Y = csbi.dwSize.Y - 2;
        /* If not at a screen border, continue, otherwise beep. */        else
            continue;        Beep( ((char) ch - 'A') * 100, 175 );    }
    /* _endthread given to terminate */    _endthread();}
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