From: Anthony R Fletcher <arif@mail.nih.gov>
To: <zsh-users@zsh.org>
Subject: Re: wait for the next process to finish
Date: Tue, 13 Dec 2011 12:32:37 -0500 [thread overview]
Message-ID: <20111213173237.GA10838@cosy.cit.nih.gov> (raw)
In-Reply-To: <alpine.DEB.2.00.1112131023060.13348@MyComp.localdomain>
On 13 Dec 2011 at 11:04:44, Rory Mulvaney wrote:
> pids=( )
> R=( $RANDOM $RANDOM )
> echo $R
> coproc () { sleep $(( $R[1]/32767.0*20 )) ; echo $$ }
> pids+=$!
> # copy the coproc fd
> exec 3<&p
> coproc () { sleep $(( $R[2]/32767.0*20 )) ; echo $$ }
> pids+=$!
> exec 4<&p
> zmodload zsh/zselect
> zselect -r 3 4
> echo $reply
>
> Then one could parse $reply.
>
> I don't know, maybe there's a much easier way to create file descriptors
> for those processes?
>
> -Rory
I was using this loop
for f in *.txt
do
what-ever-has-to-happen $f &
pwait 20
done
where pwait is a function
function pwait() {
while [ $(jobs -rp | wc -l) -ge $1 ]
do
# sleep 10
wait
done
}
(see http://superuser.com/questions/158165/parallel-shell-loops for one
example amongst many).
I was hoping that using "wait" would be better than using a "sleep 10".
But wait waits for them all and not just he last to finish. The nice
thing is that this is a small, easy loop and all the brains is in the
barrier function pwait. Sadly a sleep for 10 seconds is completely
arbitrary.
Anthony.
--
Anthony R Fletcher
Room 2033, Building 12A, http://dcb.cit.nih.gov/~arif
National Institutes of Health, arif@mail.nih.gov
12A South Drive, Bethesda, Phone: (+1) 301 402 1741.
MD 20892-5624, USA.
next prev parent reply other threads:[~2011-12-13 17:33 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-12 15:46 Anthony R Fletcher
2011-12-12 16:37 ` TJ Luoma
2011-12-12 19:41 ` Wayne Davison
2011-12-13 7:15 ` Martin Richter
2011-12-13 16:07 ` Rory Mulvaney
2011-12-13 16:45 ` Jérémie Roquet
2011-12-13 16:59 ` Anthony R Fletcher
2011-12-13 18:08 ` Daniel Shahaf
2011-12-13 16:49 ` Christoph (Stucki) von Stuckrad
2011-12-13 17:31 ` Bart Schaefer
2011-12-13 17:04 ` Rory Mulvaney
2011-12-13 17:32 ` Anthony R Fletcher [this message]
2011-12-13 18:04 ` Jérémie Roquet
2011-12-13 18:20 ` Stephane Chazelas
2011-12-13 19:19 ` Anthony R Fletcher
2011-12-13 10:01 ` Peter Stephenson
2011-12-13 17:10 ` Bart Schaefer
2011-12-13 20:42 ` Rory Mulvaney
2011-12-13 17:45 ` Stephane Chazelas
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