Question:

Consider the following rules for a shared-resource system:

• There are n shared data resources and m clients where n and m are positive integers.
• The resources are accessed via a network connection.
• The clients may read and write to the shared resources and may only execute one operation at a time.
• Clients read and write requests are served sequentially as they are received.

Propose rule changes and possible additional operations on resources besides read or write that would ensure the following:

• No clients modifications can be overwritten by another clients out-of-date revisions.