Experimental Physics and
Industrial Control System

Dear Tech-Talkers,

What is the consequence of polling the CA client library at a rate
slower than 10 Hz when in nonpreemptive mode?

The "EPICS Channel Access Reference Manual" says in the section "Polling
the CA Client Library From Single Threaded Applications" the following:

  "If preemptive call back is not enabled, then for proper operation
   CA must periodically be polled to take care of background
   activity. This requires that your application must either wait
   in one of ca_pend_event(), ca_pend_io(), or ca_sg_block()
   or alternatively it must call ca_poll() at least every 100
   milli-seconds." [1]

It's one thing to try for this minimum poll rate but quite a different
thing to guarantee it.

Thank you!

Lewis

[1] http://www.aps.anl.gov/epics/base/R3-14/12-docs/CAref.html#Polling

Replies:

Re: Polling CA client library in nonpreemptive mode at less than 10 Hz Andrew Johnson

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