MultiThreadedUnitTestExecuter: Fixed exception throwing.

test/TensorFlowNET.UnitTest/Utilities/MultiThreadedUnitTestExecuter.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Diagnostics;
 using System.Threading;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
 
 namespace TensorFlowNET.UnitTest
 {
@@ -13,6 +14,7 @@ namespace TensorFlowNET.UnitTest
     {
         public int ThreadCount { get; }
         public Thread[] Threads { get; }
+        public Exception[] Exceptions { get; }
         private readonly SemaphoreSlim barrier_threadstarted;
         private readonly ManualResetEventSlim barrier_corestart;
         private readonly SemaphoreSlim done_barrier2;
@@ -57,6 +59,7 @@ namespace TensorFlowNET.UnitTest
                 throw new ArgumentOutOfRangeException(nameof(threadCount));
             ThreadCount = threadCount;
             Threads = new Thread[ThreadCount];
+            Exceptions = new Exception[ThreadCount];
             done_barrier2 = new SemaphoreSlim(0, threadCount);
             barrier_corestart = new ManualResetEventSlim();
             barrier_threadstarted = new SemaphoreSlim(0, threadCount);
@@ -72,28 +75,53 @@ namespace TensorFlowNET.UnitTest
 
             if (ThreadCount == 1)
             {
+                Exception ex = null;
                 new Thread(() =>
                 {
-                    workloads[0](0);
-                    done_barrier2.Release(1);
+                    try
+                    {
+                        workloads[0](0);
+                    } catch (Exception e)
+                    {
+                        if (Debugger.IsAttached)
+                            throw;
+                        ex = e;
+                    } finally
+                    {
+                        done_barrier2.Release(1);
+                    }
                 }).Start();
-                
+
                 done_barrier2.Wait();
+
+                if (ex != null)
+                    throw new Exception($"Thread 0 has failed: ", ex);
+
                 PostRun?.Invoke(this);
 
                 return;
             }
 
             //thread core
-            void ThreadCore(MultiThreadedTestDelegate core, int threadid)
+            Exception ThreadCore(MultiThreadedTestDelegate core, int threadid)
             {
                 barrier_threadstarted.Release(1);
                 barrier_corestart.Wait();
-
                 //workload
-                core(threadid);
+                try
+                {
+                    core(threadid);
+                } catch (Exception e)
+                {
+                    if (Debugger.IsAttached)
+                        throw;
+                    return e;
+                } finally
+                {
+                    done_barrier2.Release(1);
+                }
 
-                done_barrier2.Release(1);
+                return null;
             }
 
             //initialize all threads
@@ -103,7 +131,7 @@ namespace TensorFlowNET.UnitTest
                 for (int i = 0; i < ThreadCount; i++)
                 {
                     var i_local = i;
-                    Threads[i] = new Thread(() => ThreadCore(workload, i_local));
+                    Threads[i] = new Thread(() => Exceptions[i_local] = ThreadCore(workload, i_local));
                 }
             } else
             {
@@ -111,7 +139,7 @@ namespace TensorFlowNET.UnitTest
                 {
                     var i_local = i;
                     var workload = workloads[i_local % workloads.Length];
-                    Threads[i] = new Thread(() => ThreadCore(workload, i_local));
+                    Threads[i] = new Thread(() => Exceptions[i_local] = ThreadCore(workload, i_local));
                 }
             }
 
@@ -126,6 +154,11 @@ namespace TensorFlowNET.UnitTest
             //wait for threads to finish
             for (int i = 0; i < ThreadCount; i++) done_barrier2.Wait();
 
+            //handle fails
+            for (int i = 0; i < ThreadCount; i++)
+                if (Exceptions[i] != null)
+                    throw new Exception($"Thread {i} has failed: ", Exceptions[i]);
+
             //checks after ended
             PostRun?.Invoke(this);
         }