Experimental Physics and
Industrial Control System

Ben,

The "dbr" pointer in the "event_handler_args" structure, and the data it
points to,  are definately valid only while executing inside the
application's callback function. You are correct concerning lack of
specifics on this point in the CA refernece manual. I corrected that
omission.

Jeff

> -----Original Message-----
> From: Benjamin Franksen [mailto:[email protected]] 
> Sent: Friday, February 13, 2004 2:35 PM
> To: [email protected]
> Subject: CA question
> 
> 
> Hello,
> 
> I have a simple question regarding the CA client library: 
> which is the 
> guaranteed live span of the data ointed to by the void 
> pointer argument 
> received by a CA event handler routine?
> 
> More specifically: does this pointer change from call(-back) 
> to call(-back) or 
> does it always refer to the same memory location? (It could 
> of course be 
> anything in between).
> 
> The reason I ask is that (1) i'd like to know if there are 
> any conditions 
> under which it is safe to store the pointer for later access 
> and (2) i 
> couldn't find any hint on this in the CA reference manual.
> 
> Ben
> 

References:

CA question Benjamin Franksen

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