Experimental Physics and
Industrial Control System

Wang Xiaoqiang via Tech-talk <[email protected]> · Tue, 5 Mar 2019 17:01:53 +0100

Hi,

Call ca_flush_io after ca_put.

1. ca_task_initialize is the old API, and creates a non-preemptive context.

2. DBR is for request and DBF is for field type. But plain DBR_XXX has

the same value as DBF_XXX.

Best
Xiaoqiang

On 3/5/19 3:08 PM, Abdalla Ahmad via Tech-talk wrote:

Hi

The attached C file is a snippet from a Qt project. In the project there

was a function that writes values to many PVs in a loop. What was

happening is that some PVs do not get their new value updated

immediately but after 3 or 4 seconds. The code shows a similar behavior,

two consecutive "ca_put" calls, and the same behavior occurs. I

double-checked the database (included in the comments) but there is

nothing wrong. I tried to use ca_context_ or ca_task_ but the project

crashes maybe because the QE framework is already handling low-level CA.

What am I missing here?

Another two questions came up:

1.What is the difference between ca_task_initialize and ca_context_create?

2.What is the difference between request types (DBR_) and field types

(DBF_)?

P.S.: We are using Base 3.15.6

Best Regards,

Abdalla Ahmad

Control Engineer

SESAME

Allan, Jordan.

Tel: (+962-5) 3511348 , ext. 265

Fax: (+962-5) 3511423

Mob: (+962-7)88183296

www.sesame.org.jo <http://www.sesame.org.jo/>