Both top and htop will toggle the display of PID/TID when you press 'H'. The header, somewhat confusingly, remains "PID". In reality, the PID is shared between threads. The ps utility has a separate field for thread ID, called "LWP". In any case, this ID is accessible for the thread via gettid, a Linux-specific syscall...

Here's a snippet that appears to work on my system: 

use threads;

sub gettid {
    use Config;
    die if $Config{archname} !~ /x86_64-linux/;

    syscall 186
}

sub diag {
    print "pid=$$ tid=@{[threads->tid]} gettid=@{[gettid]}\n";
}

async { diag }->join for 1..5;

[download]

Edit. s/detach/join/, just in case.

In reply to Re: Get PID of child threads by oiskuu
in thread Get PID of child threads by TS90

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