initial import

best-practices/goroutine-pooling/main.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"fmt"
+	"sync"
+	"time"
+)
+
+var (
+	concurrent = 5
+	pool       = make(chan interface{}, concurrent)
+)
+
+func work(num int, w *sync.WaitGroup) {
+	pool <- "starting"
+	defer func() {
+		w.Done()
+		<-pool
+	}()
+	fmt.Printf("number %d\n", num)
+	time.Sleep(1 * time.Second)
+}
+
+func main() {
+
+	var wg sync.WaitGroup
+	for i := 0; i < 1000; i++ {
+		wg.Add(1)
+		go work(i, &wg)
+	}
+	wg.Wait()
+
+}