What are accept.lock files?

[Steven Ross <apache.org@xxxxxxxxxxxxxxxx>]

I'm running the pre-installed Apache 2 on my Mac OS X 10.5.8 machine.  
The log directory (where it writes error and access logs) is at:
/private/var/log/apache2/

The directory is filled with files like accept.lock.x where x is a  
number between 2 and 5 digits. They are all zero bytes long and date  
back many years.

What are they and can I delete all those empty files?

Thanks!
Steven

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