This is the output from top and htop. Each thread has it's own PID according to those: 
$ top -Hbn1 | grep Control
16330 root      20   0  200444  74912   5776 S  5.5  7.9   0:06.74 Control.pl
16316 root      20   0  200444  74912   5776 S  0.0  7.9   0:02.23 Control.pl
16322 root      20   0  200444  74912   5776 S  0.0  7.9   0:00.00 Control.pl
16323 root      20   0  200444  74912   5776 S  0.0  7.9   0:00.69 Control.pl
16324 root      20   0  200444  74912   5776 S  0.0  7.9   0:01.61 Control.pl
16325 root      20   0  200444  74912   5776 S  0.0  7.9   0:00.70 Control.pl
16326 root      20   0  200444  74912   5776 S  0.0  7.9   0:01.60 Control.pl
16327 root      20   0  200444  74912   5776 S  0.0  7.9   0:00.00 Control.pl
16329 root      20   0  200444  74912   5776 S  0.0  7.9   0:00.08 Control.pl

$ htop
16312 root       20   0  6184  3024  2716 S  0.0  0.3  0:00.02 │  │        └─ sudo ./Control.pl
16316 root       20   0  195M 74912  5776 S  3.3  7.9  0:09.58 │  │           └─ /usr/bin/perl ./Control.pl
16330 root       20   0  195M 74912  5776 S  2.3  7.9  0:04.29 │  │              ├─ /usr/bin/perl ./Control.pl
16329 root       20   0  195M 74912  5776 S  0.0  7.9  0:00.05 │  │              ├─ /usr/bin/perl ./Control.pl
16327 root       20   0  195M 74912  5776 S  0.0  7.9  0:00.00 │  │              ├─ /usr/bin/perl ./Control.pl
16326 root       20   0  195M 74912  5776 S  0.5  7.9  0:01.03 │  │              ├─ /usr/bin/perl ./Control.pl
16325 root       20   0  195M 74912  5776 S  0.0  7.9  0:00.45 │  │              ├─ /usr/bin/perl ./Control.pl
16324 root       20   0  195M 74912  5776 S  0.5  7.9  0:01.04 │  │              ├─ /usr/bin/perl ./Control.pl
16323 root       20   0  195M 74912  5776 S  0.0  7.9  0:00.44 │  │              ├─ /usr/bin/perl ./Control.pl
16322 root       20   0  195M 74912  5776 S  0.0  7.9  0:00.00 │  │              └─ /usr/bin/perl ./Control.pl

In reply to Re^2: Get PID of child threads by TS90
in thread Get PID of child threads by TS90

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