Experimental Physics and
Industrial Control System

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<== Date ==>		<== Thread ==>

Subject:	Re: cron-type scheduling in database or sequencer?
From:	Maren Purves <[email protected]>
To:	Kay-Uwe Kasemir <[email protected]>
Cc:	tech talk <[email protected]>
Date:	Thu, 14 Sep 2006 09:01:06 -1000

Kay-Uwe Kasemir wrote:

Hi:

Both the database and the sequencer have good support for
periodic scheduling (scan field resp. delay() routine).
But I now have a need for scheduling things at certain times,
for example "at 00:15 and then every 6 hours",
meaning: run at 00:15, 06:15, 12:15 and 18:15 each day.

spawn a task?

We have the following running every UT midnight
(originally written by Nick Rees):

taskSpawn ("dhsDailyUpdate", 100, 8, 20000, dhsDailyUpdate)
(this is from the IOS's startup script)

and it does: /* dhsDailyUpdate - task that executes once a day at 00:00 UT to update the file number */

void dhsDailyUpdate()
{
    time_t    timeNextUpdate = 0;
    time_t    timeNow, timeToday, timeTomorrow;
    struct tm tmNow,   tmToday,   tmTomorrow;
    int secondsDelay;

    do
    {
        /* Find the current time in time_t and struct tm formats */
        timeNow = time(NULL);
        gmtime_r( &timeNow, &tmNow );

/* Create a tm structure and time_t which is the beginning of today UTC */ tmToday = tmNow; tmToday.tm_hour = 0; tmToday.tm_min = 0; tmToday.tm_sec = 0; timeToday = mktime( &tmToday );

/* Now create a tm structure and time_t which is the beginning of tomorrow UTC Note we rely on the ability of mktime to notice month and year changes to sort these out just from the addition of the day number */ tmTomorrow = tmToday; tmTomorrow.tm_mday++; timeTomorrow = mktime( &tmTomorrow );

/* Now update the observation number if the next update is before today (the normal occurance) or after tomorrow (indicating that a time error has occurred in the last iteration */ if (timeNextUpdate <= timeToday || timeNextUpdate > timeTomorrow ) { DHS_ID pDrv = &dhsDrv;

dhsObsnum ( pDrv ); <--------------- or whatever you want it to run timeNextUpdate = timeTomorrow; }

/* Calculate the number of seconds left in today */ secondsDelay = 86400 - (tmNow.tm_hour*3600 + tmNow.tm_min*60 + tmNow.tm_sec); taskDelay( secondsDelay * sysClkRateGet() ); } while (TRUE); }

Obviously you can make it run at other times and other frequencies.

Aloha,
Maren

References:: cron-type scheduling in database or sequencer? Kay-Uwe Kasemir

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Navigate by Thread:: Prev: Re: cron-type scheduling in database or sequencer? Andrew Johnson; Next: Active-X and Epics Bill Nolan; Index: 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 <2006> 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024

ANJ, 02 Sep 2010

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System