Golang ゴールーチンで並列数を指定して実行 - Qiita

package main import ( "sync" "time" "fmt" ) func sub(message string) { fmt.Printf("%s start\n", message) time.Sleep(5 * time.Second) fmt.Printf(" -> %s end\n", message) time.Sleep(1 * time.Second) } func getMessages() (messages []string) { messages = []string{ "a", "b", "c", "d", "e", "f", "g", "h", } return } func main() { // 並列数 concurrency := 4 // 並列キューを作成 limit := make(chan int, concurrency) /