Re: IOC to use time from its own processor

[Andrew Johnson <anj@aps.anl.gov>]

Hi Dehong,

On Thursday 06 November 2008 09:53:43 Dehong Zhang wrote:
>
> I made up a method like:
>
> #include "epicsTime.h"
>
> epicsTime getCurrent()
> {
>     struct timespec ts;
>
>     clock_gettime( CLOCK_REALTIME, &ts );
>     return epicsTime ( ts );
> }

The getCurrent routine needs to take a pointer to an epicsTimeStamp object, 
and it returns ERROR = -1 or OK = 0.  Try this:

int clockGetCurrent (epicsTimeStamp *pDest) {
    struct timespec ts;

    if (clock_gettime (CLOCK_REALTIME, &ts))
        return -1;

    *pDest = epicsTime (ts);
    return 0;
}

> Can i invoke iocClockRegister(&getCurrent, NULL) in the vxWorks
> startup script (how ?), or I have to wrap it with a simple command so that
> it can be invoked before iocInit?

For R3.14.8 I think you should be able to put that statement directly in your 
startup script; replace the NULL with 0 though, and make sure you call it 
before any EPICS code runs that asks for the current time since that will 
cause the built-in routines to get registered instead.  It's possible that 
you might have to drop the ampersand & character, but try it with first.

HTH,

- Andrew
-- 
Talk is cheap. Show me the code. -- Linus Torvalds