From: Paul H. Hargrove (PHHargrove_at_lbl_dot_gov)
Date: Tue Dec 01 2009 - 13:07:54 PST
The function cr_checkpoint() will return 0 when it runs taking a checkpoint.
If you application is later restarted from a checkpoint file, then the
execution will appear to begin with a positive return value from
cr_checkpoint(). This distinction between the continuation and restart
allows a callback to perform any extra work required at restart to
restore resources or settings not saved by BLCR (example: TCP sockets).
-Paul
luyang dong wrote:
> dear teachers:
> The following program is the callback described in
> Berkeley Lab's Checkpoint Restart, but I confuse with the
> cr_checkpoint(0),why does its returning value have two kinds(0 and
> positive).According to my understanding,my_callback is called when
> user Send the application a signal that tells it to checkpoint or
> when checkpoint is completed.
> thanks a lot
> best wishes
> Luyang Dong
> my_callback {
> /* cr_checkpoint() returns twice. */
> ret = cr_checkpoint(0);
> if (ret > 0) {
> checkpoint_status = restart;
> } else if (ret == 0) {
> checkpoint_status = continue;
> } else {
> checkpoint_status = error;
> }
> return 0;
> }
>
>
>
> ------------------------------------------------------------------------
> 好玩贺卡等你发，邮箱贺卡全新上线！
> <http://cn.rd.yahoo.com/mail_cn/tagline/card/*http://card.mail.cn.yahoo.com/>
--
Paul H. Hargrove PHHargrove_at_lbl_dot_gov
Future Technologies Group Tel: +1-510-495-2352
HPC Research Department Fax: +1-510-486-6900
Lawrence Berkeley National Laboratory