Re: Floating Point Within A Dialog

Not only does the floating point package need to be initialized in every callback but the floating point stack also has to be allocated. 'N0 the float stack pointer is NOT initialized for callbacks.
However, you don't want to allocate the stack too many times or you run out of memory for the callback and get a Dictionary Full error message from Swiftforth.
 I use the following successfully,
: INITFP ( - )
  <<F 'N0 @ HERE <> \ see if this callback has been initialized yet
           IF 16 FSTACK \ so only once per callback
           THEN /NDP F>> ; \ /ndp needs stack allocated first

The callback has to use this for every message received but some messages use the same ram, hence the 'N0 test.
Warren Heath ( wheath at comcast.net )

-------------- Original message --------------

> Thanks Gene and Rick. I did try initializing the floating point stack =
> in the callback (no luck) but didn't mention it. Although the the FP =
> package includes an /NDP in an "onenvload:" statement it didn't occur to =
> me that the callback also needed it.
>
> -----Original Message-----
> From: Gene LeFave [mailto:gene_at_tekdata.com]
> Sent: Tuesday, May 03, 2005 2:01 PM
> To: sftalk_at_forth.com
> Subject: [sftalk] Re: Floating Point Within A Dialog
>

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Received on Wed May 04 2005 - 04:22:41 PDT