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Current Path: /opt/golang/1.17.2/src/sync

📁 ..
📁 atomic
📄 cond.go(2.54 KB)
📄 cond_test.go(5.07 KB)
📄 example_pool_test.go(1 KB)
📄 example_test.go(1.14 KB)
📄 export_test.go(1.27 KB)
📄 map.go(11.53 KB)
📄 map_bench_test.go(6.3 KB)
📄 map_reference_test.go(3.9 KB)
📄 map_test.go(4.15 KB)
📄 mutex.go(7.32 KB)
📄 mutex_test.go(5.7 KB)
📄 once.go(2.29 KB)
📄 once_test.go(1.1 KB)
📄 pool.go(8.57 KB)
📄 pool_test.go(7.27 KB)
📄 poolqueue.go(8.87 KB)
📄 runtime.go(1.97 KB)
📄 runtime2.go(507 B)
📄 runtime2_lockrank.go(587 B)
📄 runtime_sema_test.go(1.34 KB)
📄 rwmutex.go(4.93 KB)
📄 rwmutex_test.go(4.4 KB)
📄 waitgroup.go(4.41 KB)
📄 waitgroup_test.go(5.78 KB)

Editing: example_test.go

// Copyright 2012 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 (
	"fmt"
	"sync"
)

type httpPkg struct{}

func (httpPkg) Get(url string) {}

var http httpPkg

// This example fetches several URLs concurrently,
// using a WaitGroup to block until all the fetches are complete.
func ExampleWaitGroup() {
	var wg sync.WaitGroup
	var urls = []string{
		"http://www.golang.org/",
		"http://www.google.com/",
		"http://www.somestupidname.com/",
	}
	for _, url := range urls {
		// Increment the WaitGroup counter.
		wg.Add(1)
		// Launch a goroutine to fetch the URL.
		go func(url string) {
			// Decrement the counter when the goroutine completes.
			defer wg.Done()
			// Fetch the URL.
			http.Get(url)
		}(url)
	}
	// Wait for all HTTP fetches to complete.
	wg.Wait()
}

func ExampleOnce() {
	var once sync.Once
	onceBody := func() {
		fmt.Println("Only once")
	}
	done := make(chan bool)
	for i := 0; i < 10; i++ {
		go func() {
			once.Do(onceBody)
			done <- true
		}()
	}
	for i := 0; i < 10; i++ {
		<-done
	}
	// Output:
	// Only once
}

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Editing: example_test.go

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