Add direct test case for threadfence_system workaround

Change-Id: I5b21b590e957c901044741ac94e816cd8b1426f9

tests/src/runtimeApi/memory/hipMemoryAllocateCoherent.cpp

@@ -0,0 +1,61 @@
+/*
+Copyright (c) 2015-2016 Advanced Micro Devices, Inc. All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+/* HIT_START
+ * BUILD: %t %s ../../test_common.cpp
+ * HIT_END
+ */
+
+
+#include <cstdio>
+#include "hip/hip_runtime.h"
+
+__global__ void Kernel(hipLaunchParm lp,volatile float* hostRes)
+{
+    int tid = hipThreadIdx_x + hipBlockIdx_x * hipBlockDim_x;
+    hostRes[tid] = tid + 1;
+    __threadfence_system();
+    // expecting that the data is getting flushed to host here!
+    // time waster for-loop (sleep)
+    for (int timeWater = 0; timeWater  < 100000000; timeWater++);
+}
+
+int main()
+{
+    size_t blocks = 2;
+    volatile float* hostRes;
+    hipHostMalloc((void**)&hostRes,blocks*sizeof(float),hipHostMallocMapped);
+    hostRes[0]=0;
+    hostRes[1]=0;
+    hipLaunchKernel(HIP_KERNEL_NAME(Kernel), dim3(1), dim3(blocks), 0, 0, hostRes);
+    int eleCounter = 0;
+    while (eleCounter < blocks)
+    {
+        // blocks until the value changes
+        while(hostRes[eleCounter] == 0);
+        printf("%f\n", hostRes[eleCounter]);;
+        eleCounter++;
+    }
+    hipHostFree((void *)hostRes);
+    return 0;
+}
+