Added async memcpy driver api

Change-Id: I90e8a078d668a408e79f9e1142e7534771467a4f

tests/src/hipDrvMemcpy.cpp

@@ -6,21 +6,39 @@
 #define SIZE LEN<<2
 
 int main(){
-  int *A, *B, *C;
-  hipDeviceptr Ad, Bd;
+  int *A, *B;
+  hipDeviceptr_t Ad, Bd;
   A = new int[LEN];
   B = new int[LEN];
-  C = new int[LEN];
+
   for(int i=0;i<LEN;i++){
     A[i] = i;
   }
+
   hipMalloc((void**)&Ad, SIZE);
   hipMalloc((void**)&Bd, SIZE);
+
   hipMemcpyHtoD(Ad, A, SIZE);
   hipMemcpyDtoD(Bd, Ad, SIZE);
   hipMemcpyDtoH(B, Bd, SIZE);
-  hipMemcpyHtoH(C, B,SIZE);
+
   for(int i=0;i<16;i++){
-    std::cout<<A[i]<<" "<<C[i]<<std::endl;
+    std::cout<<A[i]<<" "<<B[i]<<std::endl;
   }
+
+  int *Ah, *Bh;
+  hipHostMalloc(&Ah, SIZE, 0);
+  hipHostMalloc(&Bh, SIZE, 0);
+  memcpy(Ah, A, SIZE);
+  hipStream_t stream;
+  hipStreamCreate(&stream);
+
+  hipMemcpyHtoDAsync(Ad, Ah, SIZE, stream);
+  hipStreamSynchronize(stream);
+  hipMemcpyDtoDAsync(Bd, Ad, SIZE, stream);
+  hipStreamSynchronize(stream);
+  hipMemcpyDtoHAsync(Bh, Bd, SIZE, stream);
+  hipStreamSynchronize(stream);
+
+  std::cout<<Ah[10]<<" "<<Bh[10]<<std::endl;
 }