48 lines
597 B
Go
48 lines
597 B
Go
package main
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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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var (
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x int64
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wg sync.WaitGroup
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rwlock sync.RWMutex
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lock sync.Mutex
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)
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func main() {
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start := time.Now()
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for i := 0; i < 10; i++ {
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wg.Add(1)
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go write()
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}
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for i := 0; i < 100; i++ {
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wg.Add(1)
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go read()
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}
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wg.Wait()
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fmt.Println("cost:", time.Since(start))
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}
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func read() {
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//lock.Lock()
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rwlock.RLock()
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time.Sleep(time.Millisecond)
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//lock.Unlock()
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rwlock.RUnlock()
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wg.Done()
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}
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func write() {
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rwlock.Lock()
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//lock.Lock()
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x = x + 1
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time.Sleep(10 * time.Millisecond)
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//lock.Unlock()
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rwlock.Unlock()
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wg.Done()
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}
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