Lock Semaphores

In order to remain compatible with the variety of networks supported in OpenInsight, the system uses a standard protocol for the establishment of locks. This is based on lock semaphores.

When a BASIC+ LOCK statement is executed, the system uses the file handle and record key information (if locking a record) to create a lock semaphore. In order to accommodate all potential network locking schemes, the semaphore is simplified by hashing the file and record information into a reduced eight-byte format.