https://github.com/remeh/sizedwaitgroup

SizedWaitGroup has the same role and close to the same API as the Golang sync.WaitGroup but it adds a limit on the amount of goroutines started concurrently.
https://github.com/remeh/sizedwaitgroup

Last synced: 4 days ago
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SizedWaitGroup has the same role and close to the same API as the Golang sync.WaitGroup but it adds a limit on the amount of goroutines started concurrently.

• Host: GitHub
• URL: https://github.com/remeh/sizedwaitgroup
• Owner: remeh
• License: mit
• Created: 2016-11-19T13:49:25.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2022-03-17T13:12:43.000Z (almost 3 years ago)
• Last Synced: 2025-01-03T16:06:21.957Z (11 days ago)
• Language: Go
• Homepage:
• Size: 10.7 KB
• Stars: 419
• Watchers: 7
• Forks: 47
• Open Issues: 6
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• go-awesome - SizedWaitGroup - concurrency control (Open source library / Concurrency)

README

        
# SizedWaitGroup

[![GoDoc](https://godoc.org/github.com/remeh/sizedwaitgroup?status.svg)](https://godoc.org/github.com/remeh/sizedwaitgroup)

`SizedWaitGroup` has the same role and API as `sync.WaitGroup` but it adds a limit of the amount of goroutines started concurrently.

`SizedWaitGroup` adds the feature of limiting the maximum number of concurrently started routines. It could for example be used to start multiples routines querying a database but without sending too much queries in order to not overload the given database.

# Example

```go

package main

import (

        "fmt"

        "math/rand"

        "time"

        "github.com/remeh/sizedwaitgroup"

)

func main() {

        rand.Seed(time.Now().UnixNano())

        // Typical use-case:

        // 50 queries must be executed as quick as possible

        // but without overloading the database, so only

        // 8 routines should be started concurrently.

        swg := sizedwaitgroup.New(8)

        for i := 0; i < 50; i++ {

                swg.Add()

                go func(i int) {

                        defer swg.Done()

                        query(i)

                }(i)

        }

        swg.Wait()

}

func query(i int) {

        fmt.Println(i)

        ms := i + 500 + rand.Intn(500)

        time.Sleep(time.Duration(ms) * time.Millisecond)

}

```

# License

MIT

# Copyright

Rémy Mathieu © 2016