>>>I looked primary key generation routine from Craig website and
>>>found that it uses flock() instead on rlock()
>>>
>>>This causes several perfomance slowdown if there are many
>>>different primary keys required concurrently.
>>>
>>>In code comment there is a note that there are problems using
>>>rlock().
>>>
>>>Can anybody give me information against using rlock()
>>>to lock record in a table used for sequential
>>>primary key generation ?
>>
>>I found that there was contention at times on the keys table when using RLOCK, so I changed it and my problems went away.
>
>I don't know any fox framework or program which uses flock().
>All they use rlock() with key table.
>Have you discovered an undocumented rlock() bug not noticed by any others?

I don't think it is a bug, otherwise I would have reported it. The problems I saw could have been due to network problems, rather than with Fox. I didn't research it extensively due to time restraints.