December 2022
Intermediate to advanced
528 pages
15h 41m
English
Content preview from Functional and Concurrent Programming: Core Concepts and Features
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Chapter 20
Case Study: Thread-Safe Queue
This first concurrent programming case study discusses several possible lock-based implementations of a thread-safe first-in-first-out queue. Of particular interest are the contrasts between public and private locks and between single and multiple locks.
20.1 Queues as Pairs of Lists
One classic design of a first-in-first-out queue uses two functional lists. The idea is to store the state of a queue into two lists: in and out. List out represents the front of the queue, in order, and list in is the back of the queue, in reverse order (Figure 20.1). Accordingly, the head of out is the oldest (first-inserted) element of the queue; the head of in is the youngest (last-inserted). Queue elements are removed ...
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