33 lines
424 B
Go
33 lines
424 B
Go
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package main
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import (
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"strconv"
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"sync"
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)
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type Counter struct {
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count int
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lock sync.Mutex
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}
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func NewCounter() *Counter {
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return &Counter{count: 0}
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}
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func (c *Counter) Add() {
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c.lock.Lock()
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defer c.lock.Unlock()
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c.count += 1
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}
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func (c *Counter) Sub() {
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c.lock.Lock()
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defer c.lock.Unlock()
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c.count -= 1
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}
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func (c *Counter) String() string {
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c.lock.Lock()
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defer c.lock.Unlock()
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return strconv.Itoa(c.count)
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}
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