bfs：实现maxOpenFiles

internal/utils/bfs/threads_limiter.go

@@ -0,0 +1,26 @@
+// Copyright 2024 GoEdge CDN goedge.cdn@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package bfs
+
+import "github.com/TeaOSLab/EdgeNode/internal/zero"
+
+// TODO 使用atomic代替channel？需要使用基准测试对比性能
+// TODO 线程数可以根据硬盘数量动态调整？
+var readThreadsLimiter = make(chan zero.Zero, 8)
+var writeThreadsLimiter = make(chan zero.Zero, 8)
+
+func AckReadThread() {
+	readThreadsLimiter <- zero.Zero{}
+}
+
+func ReleaseReadThread() {
+	<-readThreadsLimiter
+}
+
+func AckWriteThread() {
+	writeThreadsLimiter <- zero.Zero{}
+}
+
+func ReleaseWriteThread() {
+	<-writeThreadsLimiter
+}