# perl thread
(gdb) p my_perl
$1 = (PerlInterpreter *) 0xb
(...)
 dSP;
(gdb) p my_perl
$7 = (PerlInterpreter *) 0x555555953260
(...)
# mpv thread:
(gdb) p my_perl
$2 = (PerlInterpreter *) 0x1
(...)
dSP;
(gdb) p my_perl
$3 = (PerlInterpreter *) 0x0