Try forking/threading early before curl is loaded 
use threads; 
async sub {
    print join q/ /, threads->tid, "\n";
    sleep 3;
    return;
};

require WWW::Curl::Easy;
...;
exit 0;

[download]

In reply to Re: WWW::Curl and making it thread safe by Anonymous Monk
in thread WWW::Curl and making it thread safe by lsuchocki

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