Channels: Implementation, Contention, the Memory Model, and Alternatives
Compare synchronization workloads while preserving the ordering semantics each primitive provides.
This chapter is part of the paid launch. The preview stays visible so readers can evaluate the exact scope before buying.
Core and Complete. Complete also includes the practical exam and free Go-version updates.
What this chapter teaches
Channels are the idiomatic, fast way for goroutines to share data. Prefer them over locks everywhere.
an hchan has a mutex, a ring buffer, and sender/receiver wait queues. Successful sends and receives acquire the lock; a failed non-blocking operation can return from an atomic fast path without it. An unbuffered operation pairs a sender and receiver directly, parking only when its counterpart is not already waiting. Under contention the channel machinery can become the bottleneck, so a sync.Mutex or sync/atomic is measurably faster for the counter measured here. Choose a channel for its communication, blocking, select, and happens-before semantics, and benchmark the actual workload.
Unlock Chapter 13 and the rest of the course.
Core unlocks every paid chapter and lab. Complete also includes the practical exam and future Go-version updates.
Full course access with the complete mechanics curriculum.
Best-value launch option with the exam and free Go-version course updates.
No subscription or account required. Access is tied to the email entered at Stripe Checkout and can be restored by email.