Re: What is this "Do you need to predeclare croak" about?

Hi Karl, I am not clever enough to know how this could lead to the warning, but do you need to use a mutex since you are writing to a shared data structure?

...
use MCE::Loop;
use MCE::Shared;
use MCE::Mutex;

my $result = MCE::Shared->hash;
my $mutex = MCE::Mutex->new
...

mce_loop {
    my @data = $fetch->($_);
    sleep AMOUNT;
    $mutex->enter( $result->set( $_ => \@data ) );
}
@urls;

...
[download]

Hope this helps! (Mario would know better...)

The way forward always starts with a minimal test.

Comment on Re: What is this "Do you need to predeclare croak" about? Download Code

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Re^2: What is this "Do you need to predeclare croak" about? by marioroy (Prior) on Jun 14, 2017 at 21:55 UTC
Hi 1nickt. Yes, a mutex is necessary when workers update the same element in a shared hash. For Karl's demonstration, a mutex is optional when workers update unique elements via the OO interface.	[reply]
Re^3: What is this "Do you need to predeclare croak" about? by 1nickt (Canon) on Jun 15, 2017 at 02:44 UTC
Thanks for clarifying. I hadn't made the distinction, but I see it's an important one, certainly don't want to block if not needed. The way forward always starts with a minimal test.	[reply]
Re^2: What is this "Do you need to predeclare croak" about? by karlgoethebier (Abbot) on Jun 14, 2017 at 19:20 UTC
According to Mario i don't need a mutex - as far as i remember ;-) Update: I tried it with the mutex as you suggested. Doesn't help. Thanks and best regards, Karl ŤThe Crux of the Biscuit is the Apostropheť Furthermore I consider that Donald Trump must be impeached as soon as possible	[reply]
Re^3: What is this "Do you need to predeclare croak" about? by Anonymous Monk on Feb 21, 2018 at 09:41 UTC
Hi! Add next line my script - fix this error for me(Do you need to predeclare croak): `use IO::Handle;`	[reply] [d/l]