what can be used in a signal handler

[hg]

Hi,

I posted an equivalent question earlier ... but am still not sure:

I currently (under Linux) have a program that uses Queue.put (raw_input(''))
in a signal handler and Queue.get() in the main/only thread.

It works but I want to know if it is legal / what type of synchro API I have
the right to use in a signal handler.

Regards,

hg