counter

Package counter is a simple thread-safe atomic counter. It is basically just a wrapper of convenience functions around "sync/atomic" compare and swap operations (CAS) for uint64 and int64 (without ability to go into negative numbers).

Fork of https://github.com/Avalanche-io/counter

Example

package main

import (
    "fmt"
    "sync"

    "github.com/gosimple/counter"
)

func main() {

    c := counter.New()
    var wg sync.WaitGroup
    for i := 0; i < 8; i++ {
        wg.Add(1)
        go func() {
            defer wg.Done()
            for i := 0; i < 10000; i++ {
                c.Up()
            }
        }()
    }
    wg.Wait()

    fmt.Printf("c = %d\n", c.Get())

}

output: c = 80000

Functions

• Add(val uint64) uint64 - Add val to the counter and return the total.

• Up() uint64 - Add 1

• Down() uint64 - Subtract 1

• Subtract(val uint64) uint64 - Subtract val from the counter and return the total. If the value would be below zero then then the counter is set to zero and zero is returned.

• Set(val uint64) - Set the counter to val.

• Get() uint64 - Get the value.

All methods are tread-safe non-blocking operations on the underlying uint64.