Experimental Physics and
Industrial Control System

Benjamin Franksen <[email protected]> · Sun, 3 Apr 2011 18:34:39 +0200

Hi All

since CA does not support 64bit integer types, I wonder what to do about SNL
programs with declarations like

long x;
assign x to "whatever";

on a system where sizeof(long)==8 (like linux-x86_64). Note that in SNL code,
the type of a variable determines the request type for CA requests. In this
case DBR_LONG is certainly wrong, as it is defined to be 32bit.

So, should this be a warning? An error? Or should I use the smaller DBR_LONG
request and convert? Conversion might lead to quite subtle bugs, however, so
ATM my preference is to make it an error, i.e. the SNL compiler checks if
sizeof(long)!=4 and if so forbids 'assign x ...' for variables of type long or
unsigned long. This might be inconvenient to people who want to port old
sequencer programs; they'd have to replace long with int for all assigned SNL
variables, and then maybe the rest of the program won't work as expected...

BTW, I doubt that the current stable version 2.0.12 works properly on such
systems but I haven't tried it yet.

Cheers
Ben

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System