In the first two programs the GUI freezes as soon as I begin to type into STDIN

For me on Windows 7, I think the first one might be working fine (as a standalone script, at least). I find that output ceases as soon as I start to enter something into STDIN, but then resumes as soon as I hit 'Enter'.
Output for me on perl 5.24.0 is:

C:\_32\pscrpt\gtk2>perl timer1.pl
                        1496276122
                        1496276122
                        1496276122
                        1496276122
                        1496276122
                        1496276122
my input
my input
                        1496276130
                        1496276131
                        1496276131
                        1496276131
                        1496276131
                        1496276131
                        1496276131
                        1496276131
                        1496276131
my next input
my next input
                        1496276143
                        1496276144
                        1496276144
                        1496276144
                        1496276144
                        1496276144
                        1496276144
                        1496276144
                        1496276144
                        1496276144
                        1496276145
                        ....
[download]

However,YMMV.
Even if that is correct behaviour, the script is definitely buggy on perl-5.16.0.
I haven't tested versions in between.

Cheers,
Rob