How to wakeup sleeping processes

stevefox · #1 (**permalink**) 10-23-2006

Hi,
Could someone please tell me how to wakeup sleeping processes? (i.e. change the process status from "S" to "R" when viewing in ps command).

I ran a few programs in the background by "&" which went into "sleep" mode and I want them to run.

Any help will be greatly appreciated.

Steve

napolayan · #2 (**permalink**) 10-23-2006

Quote:

Originally Posted by stevefox

Hi,
Could someone please tell me how to wakeup sleeping processes? (i.e. change the process status from "S" to "R" when viewing in ps command).

I ran a few programs in the background by "&" which went into "sleep" mode and I want them to run.

Any help will be greatly appreciated.

Steve

try out

fg %<name of process>

eg

fg %sort will bring the background process sort into the foreground

stevefox · #3 (**permalink**) 10-24-2006

Thanks napolayan,

I tried by running the below in backgroud:

Code:

$ sleep 180 &
[1]     12059

$ ps -lfe | grep 12059 | grep -v grep
  1 S  infodba 12059 12043  0 168 24         517072c0   16         57021080 17:24:37 pts/tl    0:00 sleep 180

then did the below to bring it to foreground

Code:

$ fg %1

then check the status of the process but it was still in sleep mode:

Code:

$ ps -lfe | grep 12059 | grep -v grep
  1 S  infodba 12059 12043  0 168 24         517072c0   16         57021080 17:24:37 pts/tl    0:00 sleep 180

Am I doing something wrong?

mahendramahendr · #4 (**permalink**) 10-24-2006

fg and bg is not for making the process sleep and wake up... it is to make the process to go background and bring the process to back in case if it require any inputs...

if the process is sleeping, check whether there is any wait command in the script, check why it is waiting if there is any wait... don't think the process will go into sleep without any wait

stevefox · #5 (**permalink**) 10-24-2006

Thanx mahendramahendr

Below is the program which I am running in the background:

Code:

$ more testwait.ksh
#!/bin/ksh

n=20000

while [ $n -gt 0 ]
do
  n=`expr $n - 1`
done

I not using any "wait" command but it still goes into sleep. Is there anything in the script above which makes it sleep?

mahendramahendr · #6 (**permalink**) 10-24-2006

add echo $n inside the while loop... and see where it goes into sleep state. I guess it shows as S even if your process is doing something... because I can see that the script is actually displaying the $n value in screen, still I see the state as "S"

Don't think it is a problem, echo $n should solve your doubt.

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