win32 semaphore synchronize

#include <stdio.h>
#include <memory.h>
#include <limits.h>
#include <windows.h>
 
int
main( int argc, char* argv[] )
{
    HANDLE sem, evt;
    int i;
    static char cmd[256];
    static const char semname[] = "semtest", evtname[] = "evttest";
 
    if( argc<2 ) {
        static STARTUPINFO si;
        static PROCESS_INFORMATION pi;
 
        sem = CreateSemaphore( NULL, 1, LONG_MAX, semname );
        evt = CreateEvent( NULL, FALSE, FALSE, evtname );
 
        /* fork a new process */
        GetModuleFileName( NULL, cmd, sizeof(cmd) );
        memset( &si, 0, sizeof(STARTUPINFO) );
        si.cb = sizeof(STARTUPINFO);
        strcat( cmd, " 1" );
        CreateProcess( NULL, cmd, NULL, NULL, TRUE, 0, NULL, NULL, &si, &pi );
        for( i=0; i<10; i++ ) {
            printf( "AAAA\n" );
            WaitForSingleObject( sem, INFINITE );
            printf( "parent : critical region.\n" );
            SetEvent( evt );
        }
    }
    else {
        sem = OpenSemaphore( SEMAPHORE_ALL_ACCESS, FALSE, semname );
        evt = OpenEvent( EVENT_ALL_ACCESS, FALSE, evtname );
        for( i=0; i<10; i++ ) {
            WaitForSingleObject( evt, INFINITE );
            printf( "child : critical region.\n" );
            ReleaseSemaphore( sem, 1, NULL );
        }
    }
    CloseHandle( evt );
    CloseHandle( sem );
    return 0;
}
 
 
/* EOF */