Re: epicsThread

[Dirk Zimoch <dirk.zimoch@psi.ch>]

On 26.08.2013 16:22, Michael Davidsaver wrote:
> One mechanism for accomplishing what you ask is a delayed callback based
> on a timer. When coupled with asynchronous records (what the asyn module
> is based on) this gives a way to have long delays in record processing
> without locking everything up.
That's actually what StreamDevice is doing when it finds a 'wait' 
command in the protocol.
See http://epics.web.psi.ch/software/streamdevice

Dirk


> For an example see
>
> https://pubweb.bnl.gov/~mdavidsaver/epics-doc/epics-devsup.html#_asynchronous_example
>
>
> Michael
>
> On 08/26/2013 04:18 AM, Vikram Bhagat wrote:
> > Dear all,
> > I want to know how to create and handle EPICS thread at run time.
> > In my application, i am using serial communication. I am
> > reading/writing data from serial port.
> > I am using Asyn driver.
> >
> > In my application i have added one more functionality (asyn reason) to
> > wait for user-define time and then complete record processing.
> > In this function caput <PV name> with time in seconds will wait for
> > that much seconds (I put one loop to read system time and check that
> > user-defined time has been reached or not) and then "return asynSuccess".
> >
> > This is working fine but problem now is-> the system is not processing
> > any other record/PV till the delay time will complete. Means if i user
> > requested delay time for 5 minutes--> the system will not process
> > other reading or writing PV till 5 minutes complete.
> >
> > How i can handle this situation? while system is waiting for time
> > delay other record needs to be processed and have to give values or
> > write to the output.
> >
> > I think i have to create epicsThread for this delay. so it will run in
> > separate thread and other functions can work independently. But in my
> > case after completion of my delay i have to delete Thread ... How i
> > can delete that Thread and make sure that my asyn driver will return
> > asynSuccess for that delay function?
> >
> > Thanks & regards
> > Vikram