Go: Dealing with Lock Contention with the Atomic Package

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️ This article is based on Go 1.14.

Go , (channel) (mutex ), . , . , , Go atomic. , .

(data race) , , . map , , .

, , . :

, - :

[...]
&{[79167 79170 79173 79176 79179 79181]}
&{[79216 79219 79220 79221 79222 79223]}
&{[79265 79268 79271 79274 79278 79281]}
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

, , . -race



:

WARNING: DATA RACE
Read at 0x00c0003aa028 by goroutine 9:
  [...]
  fmt.Printf()
      /usr/local/go/src/fmt/print.go:213 +0xb5
  main.main.func2()
      main.go:30 +0x3b

Previous write at 0x00c0003aa028 by goroutine 7:
  main.main.func1()
      main.go:20 +0xfe
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

( ) atomic.

Mutex vs Atomic

sync



: sync.Mutex



sync.RWMutex



; , . :

; :

[...]
&{[213 214 215 216 217 218]}
&{[214 215 216 217 218 219]}
&{[215 216 217 218 219 220]}
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

atomic



. :

:

[...]
&{[32724 32725 32726 32727 32728 32729]}
&{[32733 32734 32735 32736 32737 32738]}
&{[32753 32754 32755 32756 32757 32758]}
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

, , atomic , . , .

, . , , , , . , , , , . :

:

name                              time/op
AtomicOneWriterMultipleReaders-4  72.2ns ± 2%
AtomicMultipleReaders-4           65.8ns ± 2%
MutexOneWriterMultipleReaders-4    717ns ± 3%
MutexMultipleReaders-4             176ns ± 2%
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

, . , , .

trace «Go: Discovery of the Trace Package.».

, atomic



:

. , :

, , . , , :

. :

atomic



. . , map, map, .

«Go: Mutex and Starvation».

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"Golang Developer. Professional"

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