I met a strange problem when I run a shell script with Pro*C program, which has parallel threads.
There's a loop in the shell script(attachment is the whole script):
# Run the precostcalc program in parallel each processing a supplier
# This line is commented & next line added by Indranil ------cat $SUPPLIERS | while read supplier
while read supplier
do
if [ `jobs | wc -l` -lt $SLOTS ]
then
(
precostcalc $CONNECT $supplier $ADDL_OPTIONS || touch $failed;
) &
else
# Loop until a thread becomes available
while [ `jobs | wc -l` -ge $SLOTS ]
do
: # Null command
done
(
precostcalc $CONNECT $supplier $ADDL_OPTIONS || touch $failed;
) &
fi
I found that such loop never stop (endless loop !) until I pressed "Ctrl+C", which resulted:
Pid 20983 received a SIGSEGV for stack growth failure.
Possible causes: insufficient memory or swap space,
or stack size exceeded maxssiz.
Memory fault(coredump)
because `jobs | wc -l` always 1 and $SLOTS = 1, that's why the loop cannot stop.
But if I change the 1st line of the script from "#! /usr/bin/ksh" to "#! /usr/bin/sh", that is, to use the "sh" instead of "ksh", the vaule of `jobs | wc -l` can change to 0 after several circles which stops the loop !
What difference of "ksh" and "sh" makes this happened ? Do they have different way to handle multi-thread ? or something else ?
I have applied the latest patch for "ksh": PHCO_30316, but the loop still cannot be stopped.
Any suggestion for me?
Thanks a lot !
