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Re: faxq maxing out CPU - let's crack this!!!!!
On Sun, 19 Mar 2000, Robert Colquhoun wrote:
> It is looping continuously in the for loop starting at line 341 to 359
>
> Somehow: TabEnt->State = S_MakeUpB, a0 = 0, RunLength = 0 and TabEnt->Param = 0
>
> (section of code starting at line 341)
> for (;;) { \
> LOOKUP16(13, TIFFFaxBlackTable, eof1d); \
> switch (TabEnt->State) { \
> case S_EOL: \
> EOLcnt = 1; \
> goto done1d; \
> case S_TermB: \
> SETVAL(TabEnt->Param); \
> goto doneBlack1d; \
> case S_MakeUpB: \
> case S_MakeUp: \
> a0 += TabEnt->Param; \
> RunLength += TabEnt->Param; \
> break; \
> default: \
> unexpected("BlackTable", a0); \
> goto done1d; \
> } \
> }
>
> Possibly something funny is happening in the LOOKUP16 function, or perhaps
> earlier there is an error that leads to this situation.
>
> PS I am having trouble debugging this - nested defines which expand to
> hundreds of lines of code, many variables, goto's all over the place...its
> as if the author saw hell in a dream, then woke up and had to write about
> it and the result is this code!
I've been in this hell before... and printf's are your friend... I'd add
printf's to the different cases (and to the LOOKUP16 function/macro) until
I found the problem. I'd also add a limit to that loop (abort() when a
counter reached a certain value), so I didn't have to keep hunting down
the process and killing it.
- Tom
