RE: Problem with usleep procedure

["York, Albert" <albert.york@xxxxxxxxxxxxxx>]

Thanks Scott.

That worked great.

Albert York



        -----Original Message-----
        From:   Scott Klement [SMTP:klemscot@klements.com]
        Sent:   Thursday, October 04, 2001 3:16 PM
        To:     'MIDRANGE-L@midrange.com'
        Subject:        Re: Problem with usleep procedure


        Hi Albert,

        On Thu, 4 Oct 2001, York, Albert wrote:

        > Can anyone tell me why the program below doesn't work? The program
compiles
        > and runs but doesn't delay at all.

        I don't know why your code doesn't work -- but theres something odd
going
        on here --  usleep() isn't mentioned in the ILE C/400 Run-time
reference.

        Also, I find that your program compiles, even when I don't bind to
the
        QC2LE binding directory, which is odd...  I wonder what procedure
it's
        actually calling?

        At any rate -- here's a way to do a usleep() in RPG, without needing
to
        call the usleep function:


             H DFTACTGRP(*NO) ACTGRP(*NEW) BNDDIR('QC2LE')

             D microsleep      PR            10I 0
             D  parm_usec                    10I 0 value

             c                   eval      *inlr = *on

             c                   if        microsleep(30000000) < 0
             c                   eval      Msg = 'error'
             c                   dsply                   msg              50
             c                   endif

             c                   return



*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
              *  microsleep -- this emulates the usleep() function available
              *    on most UNIX system
              *
              *    parm_usec = number of microseconds to sleep.
              *
              *   returns 0 upon success, -1 upon failure.

*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
             P microsleep      B
             D microsleep      PI            10I 0
             D  parm_usec                    10I 0 value

             D select          PR            10I 0 ExtProc('select')
             D  nfds                         10I 0 value
             D  readfds                        *   value
             D  writefds                       *   value
             D  exceptfds                      *   value
             D  timeout                        *   value

             D p_timeval       s               *
             D timeval         DS                  based(p_timeval)
             D   tv_sec                      10I 0
             D   tv_usec                     10I 0

             D size            s             10I 0
             D rc              s             10I 0

             c                   eval      size = %size(timeval)
             c                   alloc(e)  size          p_timeval
             c                   if        %error
             c                   return    -1
             c                   endif

             c                   eval      tv_sec = 0
             c                   eval      tv_usec = parm_usec
             c                   eval      rc=
select(0:*NULL:*NULL:*NULL:p_timeval)

             c                   dealloc(e)              p_timeval

             c                   return    rc
             P                 E


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