rotatelog and more than 1 vhost logging in one file

Hello,

I have a handfull of virtual hosts on my server. 2 of them belong to the
same domain (foo.domain and bar.domain).

foo.domain already uses rotatelog to log accesses.

I would like to log accesses to bar.domain in the same file than
foo.domain and I wonder if there will be a conflict when both rotatelog
processes will try to rotate the unique log file.

any hint ?

patpro