vector scaling example: add missing cuda implementation

examples/basic_examples/vector_scal_cuda.cu

@@ -0,0 +1,41 @@
+/*
+ * StarPU
+ * Copyright (C) INRIA 2008-2009 (see AUTHORS file)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * See the GNU Lesser General Public License in COPYING.LGPL for more details.
+ */
+
+#include <starpu.h>
+
+static __global__ void vector_mult_cuda(float *val, unsigned n,
+                                        float factor)
+{
+        unsigned i;
+        for(i = 0 ; i < n ; i++)
+               val[i] *= factor;
+}
+
+extern "C" void scal_cuda_func(void *buffers[], void *_args)
+{
+        float *factor = (float *)_args;
+        struct starpu_vector_interface_s *vector = (struct starpu_vector_interface_s *) buffers[0];
+
+        /* length of the vector */
+        unsigned n = STARPU_GET_VECTOR_NX(vector);
+        /* local copy of the vector pointer */
+        float *val = (float *)STARPU_GET_VECTOR_PTR(vector);
+
+        /* TODO: use more blocks and threads in blocks */
+        vector_mult_cuda<<<1,1>>>(val, n, *factor);
+
+	cudaThreadSynchronize();
+}