Click above to get retro games delivered to your door ever month!

Overview -- Network function system


   The following is a system of user-defined functions that demonstrate
   how to access database file and records in a network environment.
   Each function is time dependent, RETURNing false (.F.) if access is
   not gained after a specified number of seconds.  If access is gained
   each function terminates immediately RETURNing true (.T.).  If the
   specified number of seconds is zero, all functions attempt to gain
   access indefinitely.


   Table: Network user-defined functions
   -----------------------------------------------------------------
     Udf            Substitutes for          Purpose
   -----------------------------------------------------------------
     Net_use()      USE <file> [EXCLUSIVE]   Share/Deny others USE
     Fil_lock()     FLOCK()                  Lock current file
     Rec_lock()     RLOCK()/LOCK()           Lock current record
     Add_rec()      APPEND BLANK             Lock new blank record
   -----------------------------------------------------------------

   Note: All user-defined functions in this system assume EXCLUSIVE
   is OFF.