understanding locking in Go

package main

import (
	"fmt"
	"sync"
	"sync/atomic"
)

var (
	atomicLock int32 = 0
)

func lock() {
	for {
		if atomic.CompareAndSwapInt32(&atomicLock, 0, 1) {
			return
		}
	}
}

func unlock() {
	atomic.StoreInt32(&atomicLock, 0)
}

func main() {
	var wg sync.WaitGroup

	for i := range 10 {
		wg.Add(1)

		go func(i int) {
			defer wg.Done()

			fmt.Printf("%d thread tries to lock\n", i)
			lock()
			fmt.Printf("%d thread succesfully lock\n", i)
			unlock()
			fmt.Printf("%d thread succesfully unlock\n", i)
		}(i)
	}

	wg.Wait()
}


Output:
5 thread succesfully lock <= lock
5 thread succesfully unlock <= unlock
0 thread succesfully lock <= lock
1 thread tries to lock <= waits to unlock from 0
0 thread succesfully unlock <= unlock successfully
8 thread succesfully lock <= lock
8 thread succesfully unlock <= unlock
4 thread tries to lock <= wait to lock
1 thread succesfully lock <= lock
1 thread succesfully unlock
2 thread succesfully lock
2 thread succesfully unlock
3 thread succesfully lock
3 thread succesfully unlock
4 thread succesfully lock
4 thread succesfully unlock
7 thread succesfully lock
9 thread succesfully lock
7 thread succesfully unlock
9 thread succesfully unlock
6 thread succesfully lock
6 thread succesfully unlock