Re: Convert from free to fixed

On 2010/10/4 10:42 AM, Christen, Duane wrote:

I have done "retry" logic maybe 3 times in the last 10-15 years with
a condition handler. The way I've done it is with the C functions
setJmp, longJmp.

I have had no discernable problems, but if someone sees a flaw in my

logic (below) I would appreciate a heads up.

When initializing the program/procedure
If setJmp(jumpPoint) = 1; // jump to this point, from the condition handler
// after the condition is handled and the exception
// message information is loaded into the error structure.
de-register condition handler
Return;
EndIf;

It seems like it would be safer to code it like this, to make sure you don't handle a return code of say 2 the same as you would handle the zero case:
rc = setJmp(jumpPoint);
if rc = 1;
. . . what you have now
elseif rc <> 0;
. . . unexpected return code
endif;

I haven't thought before about the way the longjmp() jumps into the middle of the statement containing the setjmp(). I don't know what would happen if you coded something like "if setjmp(jumpPoint) = complex_expression", and complex_expression was evaluated by the compiler before the setjmp. I don't know whether the "if" statement would work correctly after the longjmp().