Thread synchronisation problem... Post: 302320536

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Top Forums UNIX for Advanced & Expert Users Thread synchronisation problem... Post 302320536 by Gnaag on Thursday 28th of May 2009 08:53:26 AM

05-28-2009

Registered User

Thanks for this answer !
However, pardon me but i'm still in doubt in applying this wait command to my portion of script :

Here is my loop :
$2 is a file containing destination path list. It oculd be as big as 30 or more different paths. So the blue loop is creating as many dd processes as number of different destination paths. Those dd processes have to be completed before going to the read of following block.

for i in `seq 1 $NB_PASS`
do

#copie d'une tranche vers ramdrive. "Read" from source to ramdrive
dd if=$1 of=/mnt/ramdrive/buf.dat bs=$BS count=$COUNT skip=$POINTEUR_BLOC status=noxfer

#copie de cette tranche vers les destinations. "Write" from ramdrive to multi destinations
for destination in $(cat $2)
do
dd if=/mnt/ramdrive/buf.dat of=$destination/stillwriting.tmp bs=$BS seek=$POINTEUR_BLOC oflag=append status=noxfer &
done

POINTEUR_BLOC=`expr $POINTEUR_BLOC + $COUNT`
done

I would like that the blue loop wait for all it's child dd process to finish before go back to red loop.

Last edited by Gnaag; 05-28-2009 at 10:00 AM..

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