From: "Antoine C." <acalando@free.fr>
To: zsh-workers@zsh.org
Subject: [BUG?] "wait <PID>" sometimes confused with multiple childs
Date: Mon, 12 Mar 2018 14:23:59 +0100 (CET) [thread overview]
Message-ID: <1328064061.551458859.1520861039419.JavaMail.root@zimbra62-e11.priv.proxad.net> (raw)
Hello,
I have a problem with a script starting several subshells in background then checking their return code. It looks like the "wait <PID>" builtin is sometimes returning the error code of another child.
Here is a script reproducing this behavior. Several childs are started in a first loop with predefined return code, their PID saved, then we wait for each of them in a second loop and check their RC:
------start-----
#!/bin/zsh
while true; do
pids=()
for task in {1..16} ; do
( sleep .1 ; exit $task ) &
pids+=($!)
# uncomment to prevent bug
#sleep .1
done
for task in {1..16} ; do
wait $pids[task]
rc=$?
if (( rc != task )) ; then
echo " FAIL $pids[task]" $rc $task
fi
done
echo "done $pids"
done
------end-----
On my machine, I have many "FAIL ..." printed, around 1 "FAIL" every 2 "done".
If we comment out the "sleep" above, no more fails are printed. I also tried with bash (with a few syntax changes), and it is always working as expected.
Is it a bug or am I missing something?
Antoine
next reply other threads:[~2018-03-12 13:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20180312133446epcas1p2c0b1934921ed5c33ccf5e9aaaf9f6a9c@epcas1p2.samsung.com>
2018-03-12 13:23 ` Antoine C. [this message]
2018-03-12 14:19 ` Peter Stephenson
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