skip limiting if limit is zero

weed/util/limiter.go

@@ -85,16 +85,20 @@ func NewLimitedOutOfOrderProcessor(limit int32) (c *LimitedOutOfOrderProcessor)
 
 			request := value.Interface().(OperationRequest)
 
-			c.processorLimitCond.L.Lock()
-			for atomic.LoadInt32(&c.currentProcessor) > c.processorLimit {
-				c.processorLimitCond.Wait()
+			if c.processorLimit > 0 {
+				c.processorLimitCond.L.Lock()
+				for atomic.LoadInt32(&c.currentProcessor) > c.processorLimit {
+					c.processorLimitCond.Wait()
+				}
+				atomic.AddInt32(&c.currentProcessor, 1)
+				c.processorLimitCond.L.Unlock()
 			}
-			atomic.AddInt32(&c.currentProcessor, 1)
-			c.processorLimitCond.L.Unlock()
 
 			go func() {
-				defer atomic.AddInt32(&c.currentProcessor, -1)
-				defer c.processorLimitCond.Signal()
+				if c.processorLimit > 0 {
+					defer atomic.AddInt32(&c.currentProcessor, -1)
+					defer c.processorLimitCond.Signal()
+				}
 				request()
 			}()