Package idem supports a common pattern for halting goroutines in Go.

The implementation in halter.go is fairly self explanatory.

The test file halter_test.go has lots of examples.

The summary is: Halter is used for shutting down goroutines, and waiting until they have exited. This requires cooperation from the code the goroutine is running of course, so you'll need to be writing both. Halter has two idempotently closable channels: ReqStop to request that the goroutine stop, and Done for it to acknowledge it is just about to exit.

It is really simple actually.

Copyright (c) 2025 by Jason E. Aten, Ph.D.

Licence: 3-clause BSD, same as Go. See the LICENSE file.