-bash-3.00$ uname -a
SunOS reia 5.10 Generic_137137-09 sun4v sparc SUNW,Sun-Blade-T6320
-bash-3.00$  perl -Mthreads -e 'print $threads::VERSION . "\n"'; perl -Mthreads::shared -e 'print $threads::shared::VERSION . "\n"' ; perl -v
1.71
1.27

This is perl, v5.8.8 built for sun4-solaris-thread-multi