samba - Nov 2003 - How can i get synchronized of files between samba client and server

There is a file named 'test' at shared directory of Windows 2000.
I use smbmount to mount this on /mnt/test On Redhat Linux 7.2.(Kernel 2.4.7
samba:2.2.2).
command:smbmount //Win2000/Share /mnt/test
There are two program each named 'writer' and 'Reader'.
Writer running on Windows2000 opens the file and keep writing data to file
without closing the file.
Reader running on linux opens the file and keep reading data from this file.
But when Writer update the file , Reader cannot read the latest data.
How can I do this ?

Thanks .
Yours
Kingland