67vc33-b1a78eb8b39a7a2f.ithost.pongsawadi.ac.th

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/usr/share/go-1.22/src/sync/

Edit File: 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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Listing directory:

Name	Size	Modify	Owner/Group	Perms	Action	Select
atomic	DIR	29.06.2025 20:01:27	0/0	drwxr-xr-x	Edit Rename
cond.go	3.96 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
cond_test.go	4.96 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
example_pool_test.go	1017 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
example_test.go	1.13 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
export_test.go	1.2 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
map.go	14.98 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
map_bench_test.go	11.25 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
map_reference_test.go	5.41 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
map_test.go	6.74 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
mutex.go	8.27 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
mutex_test.go	5.94 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
once.go	2.4 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
once_test.go	1.1 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
oncefunc.go	2 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
oncefunc_test.go	6.94 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
pool.go	9 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
pool_test.go	8.1 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
poolqueue.go	8.73 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
runtime.go	2.33 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
runtime2.go	465 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
runtime2_lockrank.go	546 B	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
runtime_sema_test.go	1.34 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
rwmutex.go	7.02 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
rwmutex_test.go	4.89 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
waitgroup.go	3.87 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download
waitgroup_test.go	3.01 KB	29.03.2024 15:27:02	0/0	-rw-r--r--	Edit Rename Download

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