[Mapserver-dev] Reentrant flex scanner

[Steve Lime]

That's basically what flex gives you, plus a bunch of functions to
get and set values from that structure. Bison also has the capability
but
I've not researched it though. I think the flex is the tougher nut to 
crack.

There's still a problem of where to house this/these structures. They
would
need to be thread based and not tied to a mapObj. (This is new
territory for
me.) Would the scanner have to be initalized by an application and then
passed
into msLoadMap and any other functions that ultimately deal with
expressions?
That would be pretty simple for reading the mapfile, but expression
evaluation
is buried deep the bowels of the code. 

Steve

>>> Sean Gillies <sgillies at frii.com> 7/8/2004 1:02:20 PM >>>

On Jul 8, 2004, at 11:26 AM, Steve Lime wrote:

> Hi Folks: I've been a bit of reading, and have discovered that flex
can
> (as of when I'm not sure) generate a reentrant and apparently
> thread-safe C scanner. Has anyone used that API? How easy or hard is
it
> to port an application that uses non-reentrant scanner?
>
> Steve

Steve, I spent last sunday researching this as well.  Could be as
simple
as keeping the parser data in a struct for each thread instead of
using
globals, right?

Sean

--
Sean Gillies
sgillies at frii dot com
http://users.frii.com/sgillies