createthread 和 _beginthread 有什麼區別

Question

_beginthread调用CreateThread, 看看下面vc里面的源码就知道了unsigned long __cdecl _beginthread (
        void (__cdecl * initialcode) (void *),
        unsigned stacksize,
        void * argument
        )
{
        _ptiddata ptd;                  /* pointer to per-thread data */
        unsigned long thdl;             /* thread handle */
        unsigned long errcode = 0L;     /* Return from GetLastError() */        /*
         * Allocate and initialize a per-thread data structure for the to-
         * be-created thread.
         */
        if ( (ptd = _calloc_crt(1, sizeof(struct _tiddata))) == NULL )
                goto error_return;        /*
         * Initialize the per-thread data
         */        _initptd(ptd);        ptd->_initaddr = (void *) initialcode;
        ptd->_initarg = argument;        /*
         * Create the new thread. Bring it up in a suspended state so that
         * the _thandle and _tid fields are filled in before execution
         * starts.
         */
        if ( (ptd->_thandle = thdl = (unsigned long)
              CreateThread( NULL,
                            stacksize,
                            _threadstart,
                            (LPVOID)ptd,
                            CREATE_SUSPENDED,
                            (LPDWORD)&(ptd->_tid) ))
             == 0L )
        {
                errcode = GetLastError();
                goto error_return;
        }        /*
         * Start the new thread executing
         */
        if ( ResumeThread( (HANDLE)thdl ) == (DWORD)(-1L) ) {
                errcode = GetLastError();
                goto error_return;
        }        /*
         * Good return
         */
        return(thdl);        /*
         * Error return
         */
error_return:
        /*
         * Either ptd is NULL, or it points to the no-longer-necessary block
         * calloc-ed for the _tiddata struct which should now be freed up.
         */
        _free_crt(ptd);        /*
         * Map the error, if necessary.
         */
        if ( errcode != 0L )
                _dosmaperr(errcode);        return((unsigned long)-1L);
}