Testing
Test Goroutines and Channels in Go Code Without Sleeps
Test Go goroutines and channels without time.Sleep: range until the channel closes, use a select guard timeout, sort unordered results and check drains.
6 min read
Tag
channels
13 articles
Concurrency
The Or Done and Tee Channel Patterns in Go Explained
Three small channel helpers in Go: or-done to wrap a range loop with cancellation, tee to duplicate a stream, and or to combine several done signals.
7 min read
Concurrency
Channels or Mutexes in Go and How to Decide Between Them
Channels or mutexes in Go, decided with a benchmark and a rule of thumb: who owns the data, whether a reply is needed, and what each choice costs.
8 min read
Concurrency
Iterators Instead of Channels in Go 1.23 and Later
Compare range-over-func iterators and channel generators in Go 1.23 and later: cost per item, early break, cancellation, iter.Pull and when channels win.
7 min read
Concurrency
Merge Several Channels Into One Channel in Go Safely
Merge many channels into one in Go with a generic function: who closes the output, stopping early without leaks, reflect.Select for dynamic sets.
7 min read
Concurrency
Pub Sub in Go With Channels and Goroutines From Scratch
Build a typed in-process pub sub broker in Go from scratch: topics, per-subscriber buffers, a drop policy for slow consumers, safe unsubscribe and tests.
15 min read
Concurrency
Go Channels Under the Hood With the Real Source Code
How a Go channel is built: the hchan struct, the ring buffer, wait queues, direct hand-off to a waiting receiver, and what the compiler emits for select.
8 min read
Concurrency
Closing Channels in Go and Who Is Allowed to Do It
Who may close a Go channel and when: the single-sender rule, closing after multiple senders with a WaitGroup, close as a broadcast, and the panics to avoid.
7 min read
Editor's pick
ConcurrencyGuide
Channels in Go From Unbuffered to Buffered and Back Again
A full guide to Go channels: send and receive, blocking, buffered and unbuffered behavior, close and range, directions, nil channels, ownership and costs.
12 min read
Concurrency
Panic Send on Closed Channel and How to Avoid It in Go
Fix panic send on closed channel in Go: reproduce it, find the racing close, and apply ownership fixes for one or many senders, with context to stop them.
7 min read
Concurrency
Nil Channels in Select and the Pattern They Unlock
A nil channel blocks forever, so its select case is dead. Use that to merge streams, switch cases off, and enable a send only when a batch is ready.
7 min read
Concurrency
The Done Channel Pattern in Go and When to Retire It
The done channel pattern in Go: how a closed channel broadcasts a stop signal, how it relates to context, the any-done helper, and when to use a context.
7 min read