Experimental Physics and
Industrial Control System

Hi

 

As part of experimenting with EPICS Qt with EPICS Base 3.14.12.3, I came to the need to write a function that writes values to PVs. Here is my attempt:

 

int status;

chid id;

CA_SYNC_GID gid;

 

ca_search(name, &id);

status = ca_pend_io(1); // Already checking if status != ECA_NORMAL

ca_put(type, id, &value); // type can be DBF_STRING, DBF_DOUBLE, etc.

 

This is already working fine but I have some questions:

1.       I used to have ca_task_initialize and ca_task_exit but my Qt application always crashes on executing the function, the value is written but the app crashes. I thought since CA is already initialized and cleaned-up within EPICS Qt I removed both functions and the app works fine. Is this a correct behavior?

2.       When do I really need the synchronous group version of ca_put(the ca_sg_put)?

 

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