Beefy Boxes and Bandwidth Generously Provided by pair Networks
Syntactic Confectionery Delight
 
PerlMonks  

Re^2: panic: COND_DESTROY(6)

by menth0l (Monk)
on Feb 01, 2012 at 09:02 UTC ( #951153=note: print w/replies, xml ) Need Help??


in reply to Re: panic: COND_DESTROY(6)
in thread panic: COND_DESTROY(6)

Maybe you're right. I added a tons of logging just next to each lock occurrence to see at which point my app fails. I found that each time it was crashing near calling this function:
sub UnshareHash { my $reference = shift; lock $reference if is_shared($reference); given (ref $reference) { when ('HASH') { return { map UnshareHash($_), %{$reference} } } when ('ARRAY') { return [ map UnshareHash($_), @{$reference} ] } when ('REF') { return \UnshareHash($$reference) } default { return $reference } } }
I have a configuration object shared between threads which sometimes need to clone/unshare some part of it using the function above. I've changed the function to lock only the top-level structure:
sub UnshareHash { my $reference = shift; my $deep = shift; lock $reference if is_shared($reference) and not $deep; given (ref $reference) { when ('HASH') { return { map UnshareHash($_, 1), %{$reference} } } when ('ARRAY') { return [ map UnshareHash($_, 1), @{$reference} ] } when ('REF') { return \UnshareHash($$reference, 1) } default { return $reference } } }
For now it looks promising: my app runs for about 40 straight hours now. Before that crash happened after few hours at most, sometimes after few minutes. But that may be just a coincidence, i'll have to wait some more time.

But if it happens to be true (i.e. UnshareHash() is the culprit) then i assume that recursive locking is the problem? That would be a bug in threads::shared, wouldn't it?

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://951153]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others browsing the Monastery: (5)
As of 2016-10-01 20:08 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    How many different varieties (color, size, etc) of socks do you have in your sock drawer?






    Results (7 votes). Check out past polls.