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Re^2: Locking/unlocking program execution using a queue

by RazorbladeBidet (Friar)
on Mar 31, 2005 at 13:17 UTC ( [id://443794]=note: print w/replies, xml ) Need Help??


in reply to Re: Locking/unlocking program execution using a queue
in thread Locking/unlocking program execution using a queue

I didn't see that documented anywhere (and I have no man pages installed for flock, fcntl or lockf on the AIX machine I am working on!) so I tested it out.

By hand it seemed to work... but running it in a script of 
#!/bin/ksh

testlock.pl 1 &
testlock.pl 2 &
testlock.pl 3 &
testlock.pl 4 &
testlock.pl 5 &
gave me this: 

got lock 4
finished sleeping 4
got lock 3
finished sleeping 3
got lock 1
finished sleeping 1
got lock 5
finished sleeping 5
got lock 2
finished sleeping 2
So I don't think that's supported on all platforms
--------------
"But what of all those sweet words you spoke in private?"
"Oh that's just what we call pillow talk, baby, that's all."
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Re^3: Locking/unlocking program execution using a queue
by reasonablekeith (Deacon) on Mar 31, 2005 at 13:44 UTC
    I had only tried it by hand, but it worked fine when I ran it as per your ksh script just now. I'm on Solaris 5.8. Guess it's not something you can rely on though.
[reply]
      Yes, unfortunately, I'm finding this to be the case no matter what I do. Whatever locking mechanism I choose will have an issue with execution order. I'm currently on the hunt for an execution start time that's more granular than $^T...
      --------------
      "But what of all those sweet words you spoke in private?"
      "Oh that's just what we call pillow talk, baby, that's all."
[reply]

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