07-27-2002
It is possible, but I would not use co-processes. I would just use background jobs.
The main script can remember the pid's of the background jobs that it launches. By doing "kill -0 $pid 2> /dev/null" and then checking the $? variable, it can monitor them to see if they are still running. The kill will do nothing except succeed if the process is still running. And it will fail if the process has exited. Since kill is a ksh built-in, this is not an expensive test.
It would be very hard for the background jobs to asyncronously notify the main script as they finish. If you really want to do that, you will need signal handlers. It is much better if the main script just polls the background jobs.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
What command string will locate ONLY the PID of a process and ouput only the number of PID of the process? (1 Reply)
Discussion started by: mma_buc_98
1 Replies
2. Shell Programming and Scripting
I want to know how to work the Co-Processes in kornshell scripts. So, I very need some script about Co-Processes!
thanks ...:) (3 Replies)
Discussion started by: javalee
3 Replies
3. Filesystems, Disks and Memory
write a program create two processes to run a for loop which adds numbers 1 to n , say one process adds odd numbers and other adds even numbers (1 Reply)
Discussion started by: jayaram_miryabb
1 Replies
4. UNIX for Dummies Questions & Answers
Can someone tell how to find out how long a process has been running? I want to find something that is usually there that the paging system can check on.
Thanks (4 Replies)
Discussion started by: Beetlejuice
4 Replies
5. Shell Programming and Scripting
I have a file like this.
No. State Query Times User Processed Syslog
1 ready idle 973s 0 /Application/ugsvols/bldata01/logs/imanscript1562.syslog
2 ready idle 803s 83997 13 /Application/ugsvols/bldata01/logs/imanscript1542.syslog
3 ready idle 2954s 106641... (17 Replies)
Discussion started by: Krrishv
17 Replies
6. UNIX for Advanced & Expert Users
Is there a way to monitor certain processes and if they hang too long to kill them, but certain scripts which are expected to take a long time to let them go?
Thank you
Richard (4 Replies)
Discussion started by: ukndoit
4 Replies
7. Solaris
Hi
Is there an easy way to identify and group currently running processes into OS processes and APP processes. Not all applications are installed as packages.
Any free tools or scripts to do this?
Many thanks. (2 Replies)
Discussion started by: wilsonee
2 Replies
8. UNIX for Dummies Questions & Answers
Hi all,
I needed a little help. It's OS thing.
Suppose I have 2 machine connect over a network, I will call my machines as M1and M2.
If I copy a files from M1 to M2. What tasks are these two machine performing for copy to work.
My assumption is that M1 is performing read action and... (1 Reply)
Discussion started by: vishwesh
1 Replies
9. Shell Programming and Scripting
I had issues with processes locking up. This script checks for processes and kills them if they are older than a certain time.
Its uses some functions you'll need to define or remove, like slog() which I use for logging, and is_running() which checks if this script is already running so you can... (0 Replies)
Discussion started by: sukerman
0 Replies
10. UNIX for Dummies Questions & Answers
may i know a command to find processes not attached to a terminal?? (1 Reply)
Discussion started by: riya9
1 Replies