Question on WAL/PITR

Hello

i have one script that does a full backup weekly and one thats used to
archive the WAL files.
The script that does the full backup creates a new directory and
stores the directory name to a config file.
The script that copies the WAL files uses this configuration to store
the files.

What happens if the script for the full backup runs while the script
for copying the WAL file is running.
Can i rely on the following WAL files to match to the newly created
full backup? Say i can delete the old directories.

_tia rene