net/rpc: fix mutex comment

Fixes #8086.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/153420044

diff --git a/src/net/rpc/client.go b/src/net/rpc/client.go
index 21f79b06844638e485f055b3a24c0407be310c64..d0c4a69214e82d71277b2dae78e1d65df0c2dfa3 100644 (file)
--- a/src/net/rpc/client.go
+++ b/src/net/rpc/client.go
@@ -41,10 +41,10 @@ type Call struct {
 type Client struct {
        codec ClientCodec
 
-       sending sync.Mutex
+       reqMutex sync.Mutex // protects following
+       request  Request
 
        mutex    sync.Mutex // protects following
-       request  Request
        seq      uint64
        pending  map[uint64]*Call
        closing  bool // user has called Close
@@ -69,8 +69,8 @@ type ClientCodec interface {
 }
 
 func (client *Client) send(call *Call) {
-       client.sending.Lock()
-       defer client.sending.Unlock()
+       client.reqMutex.Lock()
+       defer client.reqMutex.Unlock()
 
        // Register this call.
        client.mutex.Lock()
@@ -146,7 +146,7 @@ func (client *Client) input() {
                }
        }
        // Terminate pending calls.
-       client.sending.Lock()
+       client.reqMutex.Lock()
        client.mutex.Lock()
        client.shutdown = true
        closing := client.closing
@@ -162,7 +162,7 @@ func (client *Client) input() {
                call.done()
        }
        client.mutex.Unlock()
-       client.sending.Unlock()
+       client.reqMutex.Unlock()
        if debugLog && err != io.EOF && !closing {
                log.Println("rpc: client protocol error:", err)
        }