Gothpool is a Golang library for running fire-and-forget jobs using a fixed size goroutine pool and processing queue.

go get github.com/radutanasa/gothpool

Or, using dep:

dep ensure -add github.com/radutanasa/gothpool

Simply instantiate the gothpool (executor pool) with your desired level of parallelism and queue size and start sending it functions.

package main

import (
    "github.com/radutanasa/gothpool"
)

func main() {	
    exec := gothpool.New(4, 1e5)
    exec.Start()
    defer exec.Stop()

    exec.Run(func() {
        // perform operations
    })	
}

It's important to note that the executor pool will finish its current job queue, but won't receive any new jobs.

A Run() call on a stopped pool will return an ExecPoolStoppedErr error.

The pool can be restarted by calling the Start() function.

IMPORTANT: Variables sent to the executor should not change!

This code results in an unexpected behavior, as i references different values:

for i:=0; i<10; i++ {
    exec.Run(func() {
        println(i)
    })
} 

This results in the correct behavior:

for i:=0; i<10; i++ {
    var j = i
    exec.Run(func() {
        println(j)
    })
}