adding warring for Windows build

CNTK.Cpp.props

@@ -42,6 +42,10 @@
 
     <UseZip>false</UseZip>
     <UseZip Condition="Exists('$(ZLIB_PATH)')">true</UseZip>
+
+    <HasMultiverso>false</HasMultiverso>
+    <HasMultiverso Condition="Exists('$(SolutionDir)\Source\Multiverso\include\multiverso')">true</HasMultiverso>
+
   </PropertyGroup>
 
   <PropertyGroup>

Source/SGDLib/SGD.cpp

@@ -425,7 +425,7 @@ void SGD<ElemType>::TrainOrAdaptModel(int startEpoch, ComputationNetworkPtr net,
     {
         // Synchronize all ranks before proceeding to ensure that
         // rank 0 has finished writing the previous model file
-        BarrierWorkers();
+        SynchronizeWorkers();
 
         // (re-)initialize 1-bit SGD
         if (GetParallelizationMethod() == ParallelizationMethod::dataParallelSGD &&
@@ -728,7 +728,7 @@ void SGD<ElemType>::TrainOrAdaptModel(int startEpoch, ComputationNetworkPtr net,
         // Synchronize all ranks before proceeding to ensure that
         // nobody tries reading the checkpoint file at the same time
         // as rank 0 deleting it below
-        BarrierWorkers();
+        SynchronizeWorkers();
 
         // Persist model and check-point info
         if ((m_mpi == nullptr) || m_mpi->IsMainNode())
@@ -797,7 +797,7 @@ void SGD<ElemType>::TrainOrAdaptModel(int startEpoch, ComputationNetworkPtr net,
     // Synchronize all ranks before proceeding to ensure that
     // rank 0 has finished writing the model file
     // TODO[DataASGD]: should othet other rank waiting in async-mode
-    BarrierWorkers();
+    SynchronizeWorkers();
 
     // progress tracing for compute cluster management
     ProgressTracing::TraceProgressPercentage(m_maxEpochs, 0.0, true);

Source/SGDLib/SGD.h

@@ -597,7 +597,7 @@ private:
         return UsingGradientAggregation(epochNumber) || UsingModelAggregation(epochNumber) || UsingAsyncGradientAggregation(epochNumber);
     }
 
-    void BarrierWorkers()
+    void SynchronizeWorkers()
     {
         if (m_mpi != nullptr && GetParallelizationMethod() != ParallelizationMethod::dataParallelASGD)
         {

Source/SGDLib/SGDLib.vcxproj

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project DefaultTargets="Build" InitialTargets="CheckDependencies" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|x64">
       <Configuration>Debug</Configuration>
@@ -149,4 +149,7 @@
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets" />
+  <Target Name="CheckDependencies">
+    <Error Condition="!$(HasMultiverso) And '$(CNTK_ENABLE_ASGD)'!='false'" Text="CNTK requires Multiverso to build, Please see https://github.com/Microsoft/CNTK/wiki/Setup-CNTK-on-Windows#getting-cntk-source-code for installation instructions." />
+  </Target>
 </Project>