mirror of
https://github.com/golang/go
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35 lines
786 B
Go
35 lines
786 B
Go
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package sync_test
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import (
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"net/http"
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"sync"
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)
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// This example fetches several URLs concurrently,
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// using a WaitGroup to block until all the fetches are complete.
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func ExampleWaitGroup() {
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var wg sync.WaitGroup
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var urls = []string{
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"http://www.golang.org/",
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"http://www.google.com/",
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"http://www.somestupidname.com/",
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}
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for _, url := range urls {
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// Increment the WaitGroup counter.
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wg.Add(1)
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// Launch a goroutine to fetch the URL.
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go func(url string) {
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// Fetch the URL.
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http.Get(url)
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// Decrement the counter.
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wg.Done()
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}(url)
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}
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// Wait for all HTTP fetches to complete.
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wg.Wait()
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}
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