blob: dc58affdaac89952d4c82e34a795f97702f918a1 [file] [log] [blame]
// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package net
import "sync"
// call is an in-flight or completed singleflight.Do call
type call struct {
wg sync.WaitGroup
val interface{}
err error
dups int
// singleflight represents a class of work and forms a namespace in
// which units of work can be executed with duplicate suppression.
type singleflight struct {
mu sync.Mutex // protects m
m map[string]*call // lazily initialized
// Do executes and returns the results of the given function, making
// sure that only one execution is in-flight for a given key at a
// time. If a duplicate comes in, the duplicate caller waits for the
// original to complete and receives the same results.
// The return value shared indicates whether v was given to multiple callers.
func (g *singleflight) Do(key string, fn func() (interface{}, error)) (v interface{}, err error, shared bool) {
if g.m == nil {
g.m = make(map[string]*call)
if c, ok := g.m[key]; ok {
return c.val, c.err, true
c := new(call)
g.m[key] = c
c.val, c.err = fn()
delete(g.m, key)
return c.val, c.err, c.dups > 0