From 15581be8a3a107eb3e66bf061ff179fd483adfa1 Mon Sep 17 00:00:00 2001
From: Shrirang Shirodkar <shrirs@microsoft.com>
Date: Wed, 20 May 2015 09:32:39 -0700
Subject: [PATCH] Fix potential race conditions while adding items to sync
 table

- The write operation dispatch queue is defined as concurrent, however,
the tasks that run in it are not thread safe.
- Changing dispatch queue type from concurrent to serial will take care
of it
- In the future, if needed, we can change it back to concurrent and
make the tasks that run in it thread safe.
---
 sdk/iOS/src/MSSyncContext.m | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sdk/iOS/src/MSSyncContext.m b/sdk/iOS/src/MSSyncContext.m
index f5ce73b5c..fdc0e8d71 100644
--- a/sdk/iOS/src/MSSyncContext.m
+++ b/sdk/iOS/src/MSSyncContext.m
@@ -53,7 +53,7 @@ -(id) initWithDelegate:(id<MSSyncContextDelegate>) delegate dataSource:(id<MSSyn
     self = [super init];
     if (self)
     {
-        writeOperationQueue = dispatch_queue_create("WriteOperationQueue", DISPATCH_QUEUE_CONCURRENT);
+        writeOperationQueue = dispatch_queue_create("WriteOperationQueue", DISPATCH_QUEUE_SERIAL);
         
         callbackQueue_ = callbackQueue;
         if (!callbackQueue_) {