Since we are going to need the "null" gordon kernel often, let's create a small

wrapper that dynamically loads it onto the SPUs and returns its identifier so
that we do not redo the same work every time.

examples/Makefile.am

@@ -25,11 +25,14 @@ BUILT_SOURCES =
 
 EXTRA_DIST = 					\
 	cuda/incrementer_cuda.cu		\
-	cuda/spmv_cuda.cu
+	cuda/spmv_cuda.cu			\
+	gordon/null_kernel_gordon.c
 
 CLEANFILES = 					\
 	cuda/incrementer_cuda.cubin		\
-	cuda/spmv_cuda.cubin			
+	cuda/spmv_cuda.cubin			\
+	gordon/null_kernel_gordon.spuelf
+	
 
 CLEANFILES += *.gcno *.gcda *.linkinfo
 
@@ -66,6 +69,9 @@ SPULIBS = -lblas #-lc -lgloss -lc
 .spuo.spuelf:
 	$(SPU_LD) $(SPULDFLAGS) $< -o $@ $(SPULIBS)
 
+BUILT_SOURCES +=				\
+	gordon/null_kernel_gordon.spuelf
+
 endif
 
 examplebindir = $(libdir)/starpu/examples/
@@ -83,6 +89,7 @@ noinst_HEADERS = 				\
 	common/blas.h				\
 	mult/dw_mult.h				\
 	cuda/incrementer_cuda.h			\
+	gordon/null.h				\
 	fortran/bindings/StarPU-fortran.h	\
 	ppm-downscaler/ppm-downscaler.h		\
 	strassen/strassen.h			\

examples/gordon/null.h

@@ -0,0 +1,32 @@
+/*
+ * 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>
+
+#ifdef USE_GORDON
+static inline unsigned load_gordon_null_kernel(void)
+{
+	unsigned elf_id =
+		gordon_register_elf_plugin("./gordon/null_kernel_gordon.spuelf");
+	gordon_load_plugin_on_all_spu(elf_id);
+
+	unsigned gordon_null_kernel =
+		gordon_register_kernel(elf_id, "empty_kernel");
+	gordon_load_kernel_on_all_spu(gordon_null_kernel);
+
+	return gordon_null_kernel;
+}
+#endif

examples/gordon/null_kernel_gordon.c

@@ -0,0 +1,22 @@
+/*
+ * 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.
+ */
+
+void empty_kernel (__attribute__ ((unused)) void **alloc,
+                __attribute__ ((unused)) void **in,
+                __attribute__ ((unused)) void **inout,
+                __attribute__ ((unused)) void **out)
+{
+}

examples/tag_example/tag_example.c

@@ -23,6 +23,10 @@
 
 #include <starpu.h>
 
+#ifdef USE_GORDON
+#include <gordon/null.h>
+#endif
+
 #define TAG(i, j, iter)	((starpu_tag_t) ( ((uint64_t)(iter)<<48) |  ((uint64_t)(j)<<24) | (i)) )
 
 sem_t sem;
@@ -185,6 +189,11 @@ int main(int argc __attribute__((unused)) , char **argv __attribute__((unused)))
 {
 	starpu_init(NULL);
 
+#ifdef USE_GORDON
+	/* load an empty kernel and get its identifier */
+	unsigned gordon_null_kernel = load_gordon_null_kernel();
+#endif
+
 	parse_args(argc, argv);
 
 	fprintf(stderr, "ITER: %d\n", nk);
@@ -193,9 +202,7 @@ int main(int argc __attribute__((unused)) , char **argv __attribute__((unused)))
 	cl.core_func = core_codelet;
 	cl.cublas_func = core_codelet;
 #ifdef USE_GORDON
-#ifdef SPU_FUNC_NULL
-	cl.gordon_func = SPU_FUNC_NULL;
-#endif
+	cl.gordon_func = gordon_null_kernel;
 #endif
 	cl.nbuffers = 0;