Here's the relevant headers in the ToC.

11. Atomic Transactions

11.1 KV Transaction Interfaces

11.2 DB Transaction Interfaces

11.3 Implementing the KV Transaction

12. Concurrent Readers and Writers

12.1 The Readers-Writer Problem

12.2 Analysing the Implementation

12.3 Concurrent Transactions

  Part 1: Modify the KV type

  Part 2: Add the Read-Only Transaction Type

  Part 3: Add the Read-Write Transaction Type

 12.4 The Free List

 12.5 Closing Remarks