first version

module/pool/pool.go

@@ -0,0 +1,40 @@
+package pool
+
+import "sync"
+
+// Pool -
+type Pool struct {
+	q  chan bool
+	wg *sync.WaitGroup
+}
+
+// NewPool -
+func NewPool(size int) *Pool {
+	if size < 1 {
+		size = 1
+	}
+
+	p := &Pool{
+		q:  make(chan bool, size),
+		wg: &sync.WaitGroup{},
+	}
+
+	return p
+}
+
+// Add new queue work
+func (p *Pool) Add() {
+	p.q <- true
+	p.wg.Add(1)
+}
+
+// Done finish work
+func (p *Pool) Done() {
+	<-p.q
+	p.wg.Done()
+}
+
+// Wait -
+func (p *Pool) Wait() {
+	p.wg.Wait()
+}