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Go Cheatsheet - WaitGroup / Mutex / Atomic

Concurrency

WaitGroup

var wg sync.WaitGroup
for i := 1; i <= 5; i++ {
    wg.Add(1)
    go func(num int) {
        defer wg.Done()
    }(i)
}
wg.Wait()

Mutex

import "sync"

var mu sync.Mutex
mu.Lock()
// do some operation
mu.Unlock()

Use atomic to increase integer

import "sync/atomic"
// ...
var ops uint64
// then in each go routine, do increase
atomic.AddUint64(&ops, 1)
// print value after all go routine finished
fmt.Println("ops:", ops)
 
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