45 lines
584 B
Go
45 lines
584 B
Go
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package mutex
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import (
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"fmt"
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"sync"
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"time"
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)
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type container struct {
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mu sync.Mutex
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counter map[string]int
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}
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func Mutex() {
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var wg sync.WaitGroup
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c := container{
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counter: map[string]int{
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"a": 0,
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"b": 0,
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},
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}
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increment := func(key string, times uint) {
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c.mu.Lock()
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defer c.mu.Unlock()
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time.Sleep(200 * time.Millisecond)
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for range times {
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c.counter[key]++
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}
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wg.Done()
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}
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wg.Add(3)
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go increment("a", 1000)
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go increment("b", 1000)
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go increment("a", 1000)
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wg.Wait()
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fmt.Printf("counter after all increment() calls: %v\n", c.counter)
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}
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