Xbase64 - Multi user / Record Locking



If you are using the Xbase64 library in a multi user environment, 

The Record Locking functionality of Xbase64 is designed to work in an evironment
where the files are not cached on a local client machine.

If you are using the Xbase64 library in a multi user environment, you will need
to verify that Oplocks are turned off for the files in question.

Oplocks is short for Opportunistic Locking.


If you are using Samba software as your file server software, you will
need to add the following to your smb.conf config files.


In the global section of the smb.conf file:

[global]
veto oplock files = /*.dbf/*.DBF/*.dbt/*.DBT/*.ndx/*.NDX/*.cdx/*.CDX/*.mdx/*.MDX


Or you could set this at the share level
[share_name]
veto oplock files = /*.dbf/*.DBF/*.dbt/*.DBT/*.ndx/*.NDX/*.cdx/*.CDX/*.mdx/*.MDX


Sometimes locking issues can be related to the network config, more than the programs
For example, the locking logic might fail if the underlying file structure does not
support it.

Mac OSX does not support locking functionality on SMB / Samba shares
Mac OSX does support locking functionality on NFS shares
Per Apple, this is by design


Function:  xbase::SetMultiUser( xbTrue || xbFalse )

  Use this function to turn multi user mode on or off.
  This function needs to be called before any files are opened or created.
  If this function is called after files are opened or created, the files
  will need to be closed and reopened for this setting to take effect.
  
  This setting turns file buffering on and off.  In a single user environment,
  set this switch to off to improve the performance of the application.