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cond.go
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cond_test.go
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example_pool_test.go
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example_test.go
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export_test.go
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map.go
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mutex.go
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Code Editor : once_test.go
// Copyright 2009 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 sync_test import ( . "sync" "testing" ) type one int func (o *one) Increment() { *o++ } func run(t *testing.T, once *Once, o *one, c chan bool) { once.Do(func() { o.Increment() }) if v := *o; v != 1 { t.Errorf("once failed inside run: %d is not 1", v) } c <- true } func TestOnce(t *testing.T) { o := new(one) once := new(Once) c := make(chan bool) const N = 10 for i := 0; i < N; i++ { go run(t, once, o, c) } for i := 0; i < N; i++ { <-c } if *o != 1 { t.Errorf("once failed outside run: %d is not 1", *o) } } func TestOncePanic(t *testing.T) { var once Once func() { defer func() { if r := recover(); r == nil { t.Fatalf("Once.Do did not panic") } }() once.Do(func() { panic("failed") }) }() once.Do(func() { t.Fatalf("Once.Do called twice") }) } func BenchmarkOnce(b *testing.B) { var once Once f := func() {} b.RunParallel(func(pb *testing.PB) { for pb.Next() { once.Do(f) } }) }
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