Add Server.singleReader option which uses a single read loop.

fuse/server.go

@@ -43,6 +43,7 @@ type Server struct {
 	outstandingReadBufs int
 	kernelSettings      InitIn
 
+	singleReader bool
 	canSplice    bool
 	loops        sync.WaitGroup
 }
@@ -239,7 +240,7 @@ func (ms *Server) readRequest(exitIdle bool) (req *request, code Status) {
 		dest = nil
 	}
 	ms.reqReaders--
-	if ms.reqReaders <= 0 {
+	if !ms.singleReader && ms.reqReaders <= 0 {
 		ms.loops.Add(1)
 		go ms.loop(true)
 	}
@@ -311,8 +312,12 @@ exit:
 			break exit
 		}
 
+		if ms.singleReader {
+			go ms.handleRequest(req)
+		} else {
 			ms.handleRequest(req)
 		}
+	}
 }
 
 func (ms *Server) handleRequest(req *request) {