实现自定义 wg 以统计协程数量

pkg/utils/sync.go

@@ -0,0 +1,29 @@
+package utils
+
+import (
+	"sync"
+	"sync/atomic"
+)
+
+type CountWaitGroup struct {
+	wg  sync.WaitGroup
+	num atomic.Uint64
+}
+
+func (c *CountWaitGroup) Add(delta uint64) {
+	c.wg.Add(int(delta))
+	c.num.Add(delta)
+}
+
+func (c *CountWaitGroup) Done() {
+	c.wg.Done()
+	c.num.Add(-1)
+}
+
+func (c *CountWaitGroup) Wait() {
+	c.wg.Wait()
+}
+
+func (c *CountWaitGroup) Count() uint64 {
+	return c.num.Load()
+}