Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?

Re: parallel functions

by kcott (Chancellor)
on Nov 07, 2012 at 21:58 UTC ( #1002757=note: print w/replies, xml ) Need Help??

in reply to parallel functions

G'day micmac,

If you add use warnings;, you'll see that the exec is not being run at all:

$ in test2 Can't exec "1": No such file or directory at ./ line +13. in test1 Can't exec "1": No such file or directory at ./ line +13. in test2 Can't exec "1": No such file or directory at ./ line +13.

What's actually happening is that $cmd->() is being run then exec is trying to use the return value ("1" from say) as its argument.

So, the first child runs test1() then, because there's no exec, it runs test2() on the second iteration. The second child runs test2() (also with no exec). That's test1() once and test2() twice.


exec $cmd->();


#exec $cmd->(); $cmd->(); last;

you'll get the desired output:

$ in test2 in test1

I'll leave you to decide if that's also the desired functionality.

-- Ken

Replies are listed 'Best First'.
Re^2: parallel functions
by micmac (Acolyte) on Nov 07, 2012 at 22:11 UTC
    Good explanation, thanks Ken.

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1002757]
[marto]: this puts me in mind of Understand, which is well worth the read IMHO

How do I use this? | Other CB clients
Other Users?
Others romping around the Monastery: (8)
As of 2018-01-17 13:36 GMT
Find Nodes?
    Voting Booth?
    How did you see in the new year?

    Results (200 votes). Check out past polls.