syncutil

Documentation

Overview

Package syncutil provides concurrency utilities.

Index

• func GetOrCreate[K comparable, V any](mu *sync.RWMutex, cache map[K]V, key K, create func() (V, error)) (V, error)

Functions

func GetOrCreate

func GetOrCreate[K comparable, V any](
	mu *sync.RWMutex,
	cache map[K]V,
	key K,
	create func() (V, error),
) (V, error)

GetOrCreate looks up key in cache under a read lock; if missing, acquires a write lock, double-checks, and calls create to populate the entry. The entry is stored in cache only when create returns a nil error. create is called while the write lock is held, so it is safe for create to read or write other fields protected by the same mu.