The define -Dusereentrant to perls ./Configure will try use _r functions instead.
It currently makes gmtime and localtime threadsafe. The functions that are still not threadsafe are atleast.
rand
srand
readdir
getlogin
getgrgid
getgrnam
getpwuid
getpwnam
The ones I am going to fix now are rand/srand, readdir and possibly getlogin.
