go-plus

go-plus (Go+) is an API library that exposes CRL's custom Go extensions to Go programs.

The following two extensions are provided:

• proc provides Go programs with finer grain control over the Go runtime system. This makes it possible to build more "advanced" concurrency data structures such as a custom sync.Pool implementation.

  It also provides a new runtime feature called "Inheritable Goroutine ID" (IGID).

  API doc link: https://pkg.go.dev/github.com/cockroachdb/go-plus/proc

• taskgroup provides Go program with a new runtime abstraction called “task group” (discussed here), to provide aggregate accounting of resource usage to fleets of related goroutines.

  API doc link: https://pkg.go.dev/github.com/cockroachdb/go-plus/taskgroup

How to use in Go programs

When using this library with a “vanilla” Go runtime, the Supported() API calls in each package return false, to indicate the extension is not available.

This makes it possible to build Go programs using this API even with a “vanilla” Go compiler and runtime.

To actually enable the extension:

1. clone the repository at https://github.com/cockroachdb/go
2. check out the crdb-fixes branch
3. build the runtime: bash src/make.bash
4. build the Go application with:
   • GOROOT set to the custom go source tree
   • PATH including $GOROOT/bin at the start

Note: the way this works is that the customized go runtime implicitly provides an extra build tag goplus. One can check whether the custom runtime is active with e.g. go test -v ./proc inside the library (the provided TestSupported reports the build tags and support status).