For shared objects, the OO interface has the least overhead. MCE::Shared provides on-demand dereferencing for array and hash-like behavior. In that case, a mutex is needed whenever dereferencing involves a fetch and store (equals 2 IPC trips to the shared-manager). Regarding the OO interface, there is a single entry point to the shared-manager process. This is why a mutex isn't needed when accessing shared objects via the OO interface, unless wanting a mutex around updating two or more shared objects.

sub task {
    our $mutex;
    $mutex->lock; # not necessary when accessing shared-objects via th
+e OO interface
    $result->push(shift);
    $mutex->unlock;

    $mutex->lock; # necessary if dereferencing involves fetch and stor
+e behind TIE
    push @{ $result }, shift;
    $mutex->unlock;
}

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In reply to Re: Where does the 6th process come from? by marioroy
in thread Where does the 6th process come from? [SOLVED] by karlgoethebier

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