From d5e3a77cb0f6eb6f3a16fcb071b6e7064595f51d Mon Sep 17 00:00:00 2001
From: Elizaveta Shashkova <Elizaveta.Shashkova@jetbrains.com>
Date: Wed, 21 Jan 2015 18:55:26 +0300
Subject: [PATCH] PY-13927 Debugger: Timeout waiting for response on 113 when
 viewing watches

Getting the next sequence number was not synchronized. Sometimes it returned the same value for different commands and lost some responses.
---
 .../jetbrains/python/debugger/pydev/RemoteDebugger.java    | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/python/pydevSrc/com/jetbrains/python/debugger/pydev/RemoteDebugger.java b/python/pydevSrc/com/jetbrains/python/debugger/pydev/RemoteDebugger.java
index 1956f9faaec8..cd2c6e2f0b4d 100644
--- a/python/pydevSrc/com/jetbrains/python/debugger/pydev/RemoteDebugger.java
+++ b/python/pydevSrc/com/jetbrains/python/debugger/pydev/RemoteDebugger.java
@@ -55,6 +55,7 @@ public class RemoteDebugger implements ProcessDebugger {
   private Socket mySocket;
   private volatile boolean myConnected = false;
   private int mySequence = -1;
+  private final Object mySequenceObject = new Object(); // for synchronization on mySequence
   private final Map<String, PyThreadInfo> myThreads = new ConcurrentHashMap<String, PyThreadInfo>();
   private final Map<Integer, ProtocolFrame> myResponseQueue = new HashMap<Integer, ProtocolFrame>();
   private final TempVarsHolder myTempVars = new TempVarsHolder();
@@ -285,8 +286,10 @@ public class RemoteDebugger implements ProcessDebugger {
   }
 
   int getNextSequence() {
-    mySequence += 2;
-    return mySequence;
+    synchronized (mySequenceObject) {
+      mySequence += 2;
+      return mySequence;
+    }
   }
 
   void placeResponse(final int sequence, final ProtocolFrame response) {