AIX PID Recycling

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Operating Systems AIX AIX PID Recycling
# 1  
Old 10-22-2009
AIX PID Recycling

Had a bizzare problem last night with one of our tools running on an AIX server that has not come up before. The tool has been in use for over a year without this problem showing up.The tool basically does this: -Kick off a background task and record the PIDGo and do a bunch of other taskswait for the background task to completeIt seems that AIX immediately reuses PID's as they become available rather than incrementing the last PID and using that. So what happened last night was that the background task completed while the tool was doing the other stuff and the PID ended up being re assigned to the wait statement! So it sat there all night waiting for itself to complete......Has anyone come across this before?
# 2  
Old 10-22-2009
The search function of the forum brought this which could be helpful:
pid number creation rules on aix

You are not new to the forum so maybe put special questions to the appropriate subforum please Smilie Moving it to AIX subforum.
# 3  
Old 10-22-2009
Smilie sorry. Forgot there was a dedicated AIX forum
# 4  
Old 10-26-2009
Interesting. Perhaps a solution is to run the long-running command in another shell, capture the return code in a file, and use the presence of the file to tell whether the original has exited?
# 5  
Old 10-27-2009
Thanks, we went with parsing more fields from the ps output to make it a more robust pattern to test for.
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