“You look at where you’re going and where you are and it never makes sense, but then you look back at where you’ve been and a pattern seems to emerge. And if you project forward from that pattern, then sometimes you can come up with something.”
Robert M. Pirsig
This chapter presents five patterns that address various types of concurrency architecture and design issues for components, subsystems, and applications: Active Object, Monitor Object, Half-Sync/Half-Async, Leader/Followers, and Thread-Specific Storage.
The choice of concurrency architecture has a significant impact on the design and performance of multi-threaded networking middleware and applications. No single concurrency architecture is suitable for all workload conditions and hardware and software platforms. The patterns in this chapter therefore collectively provide solutions to a variety of concurrency problems.
The first two patterns in this chapter specify designs for sharing resources among multiple threads or processes:
Both patterns can ...