Thanks for reporting the problem. Code had been added for some necessary
synchronization which caused the bug. I have included a on line patch to
sh/xec.c which will fix your case without breaking any regression tests.
However, I think that I could concoct a case that could hang, so I might
have to revisit this logic in the future. Anyway, try the following patch
and let me know if the problem is fixed. The patch will be in the next
ksh93 beta update.
--- old/sh/xec.c Mon Nov 18 06:52:01 2013
+++ new/sh/xec.c Wed Jan 29 14:53:10 2014
@@ -2965,7 +2965,7 @@
break;
}
}
- if(shp->procsub && *shp->procsub)
+ if(shp->procsub && *shp->procsub && t && t->com.comtyp==(COMSCAN|TCOM))
{
pid_t pid, *procsub;
int exitval = shp->exitval;
On Wed, Jan 29, 2014 at 2:36 PM, Nathan Weeks <[email protected]> wrote:
> The latest ksh alpha has a problem with the following script:
>
> ========================================
> $ cat bug.sh
> producer() {
> for ((i = 0; i < 10000; i++ ))
> do
> print ${i}
> done
> }
>
> consumer() {
> while read var
> do
> print ${var}
> done < ${1}
> }
>
> consumer <(producer)
> ========================================
>
> If the script is run using the default ksh on OS X 10.8, it runs to
> completion:
> ========================================
> $ ksh --version
> version sh (AT&T Research) 93u 2011-02-08
> $ ksh bug.sh | tail
> 9990
> 9991
> 9992
> 9993
> 9994
> 9995
> 9996
> 9997
> 9998
> 9999
> $
> ========================================
>
> However, on an OS X 10.6 host using the latest ksh alpha, the script hangs.
> Running with xtrace, it appears that the hang occurs after 3499 iterations
> of
> the "for" loop:
> ========================================
> $ ksh --version
> version sh (AT&T Research) 93v- 2013-10-08
> $ ksh -x ./bug.sh
> + consumer /dev/fd/3
> + 0< /dev/fd/3
> + read var
> + producer
> + ((i = 0))
> + (( i < 10000))
> + print 0
> + ((i++ ))
> + (( i < 10000))
> + print 1
> ...
> + ((i++ ))
> + (( i < 10000))
> + print 3499
> ========================================
>
> --
> Nathan Weeks
> IT Specialist
> USDA-ARS Corn Insects and Crop Genetics Research Unit
> http://weeks.public.iastate.edu/
> _______________________________________________
> ast-users mailing list
> [email protected]
> http://lists.research.att.com/mailman/listinfo/ast-users
>
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