fixed race issue

ants_test.go

@@ -105,7 +105,6 @@ func TestCodeCov(t *testing.T) {
 	t.Logf("pool with func, free workers number:%d", p.Free())
 	p.ReSize(AntsSize / 2)
 	t.Logf("pool with func, after resize, capacity:%d", p.Cap())
-
 }
 
 // func TestNoPool(t *testing.T) {

pool.go

@@ -145,10 +145,12 @@ func (p *Pool) Release() error {
 		for i := 0; i < running; i++ {
 			p.getWorker().task <- nil
 		}
+		p.lock.Lock()
 		for i := range p.workers {
 			p.workers[i] = nil
 		}
 		p.workers = nil
+		p.lock.Unlock()
 	})
 	return nil
 }

pool_func.go

@@ -150,10 +150,12 @@ func (p *PoolWithFunc) Release() error {
 		for i := 0; i < running; i++ {
 			p.getWorker().args <- nil
 		}
+		p.lock.Lock()
 		for i := range p.workers {
 			p.workers[i] = nil
 		}
 		p.workers = nil
+		p.lock.Unlock()
 	})
 	return nil
 }