examples: add example for dynamically allocated number of buffers per task

examples/Makefile.am

@@ -159,6 +159,7 @@ examplebin_PROGRAMS +=				\
 	basic_examples/block			\
 	basic_examples/variable			\
 	basic_examples/multiformat              \
+	basic_examples/dynamic_handles		\
 	cpp/incrementer_cpp			\
 	filters/custom_mf/custom_mf_filter      \
 	filters/fvector				\

examples/basic_examples/dynamic_handles.c

@@ -0,0 +1,150 @@
+/* StarPU --- Runtime system for heterogeneous multicore architectures.
+ *
+ * Copyright (C) 2013  Centre National de la Recherche Scientifique
+ *
+ * StarPU 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.
+ *
+ * StarPU 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>
+
+#define FPRINTF(ofile, fmt, ...) do { if (!getenv("STARPU_SSILENT")) {fprintf(ofile, fmt, ## __VA_ARGS__); }} while(0)
+
+static void dummy_small_kernel(void *descr[], void *cl_arg)
+{
+	int nb_data;
+	int i;
+
+	starpu_codelet_unpack_args(cl_arg, &nb_data);
+	assert(nb_data == 1);
+	FPRINTF(stderr, "Number of data: %d\n", nb_data);
+
+	for(i=0 ; i<nb_data; i++)
+	{
+		int *val = (int *)STARPU_VARIABLE_GET_PTR(descr[i]);
+		assert(*val == 42);
+	}
+}
+
+static void dummy_big_kernel(void *descr[], void *cl_arg)
+{
+	int nb_data;
+	int i;
+
+	starpu_codelet_unpack_args(cl_arg, &nb_data);
+	assert(nb_data == 9);
+	FPRINTF(stderr, "Number of data: %d\n", nb_data);
+
+	for(i=0 ; i<nb_data; i++)
+	{
+		int *val = (int *)STARPU_VARIABLE_GET_PTR(descr[i]);
+		assert(*val == 42);
+	}
+}
+
+static struct starpu_codelet dummy_small_cl =
+{
+	.cuda_funcs = {dummy_small_kernel, NULL},
+	.opencl_funcs = {dummy_small_kernel, NULL},
+	.cpu_funcs = {dummy_small_kernel, NULL},
+	.modes = {STARPU_RW},
+	.nbuffers = 1
+};
+
+struct starpu_codelet dummy_big_cl =
+{
+	.cuda_funcs = {dummy_big_kernel, NULL},
+	.opencl_funcs = {dummy_big_kernel, NULL},
+	.cpu_funcs = {dummy_big_kernel, NULL},
+	.nbuffers = STARPU_NMAXBUFS+1
+};
+
+int main(int argc, char **argv)
+{
+	starpu_data_handle_t handle, *handles;
+	int ret;
+	int val=42;
+	unsigned i;
+	struct starpu_task *task, *task2;
+
+	ret = starpu_init(NULL);
+	if (ret == -ENODEV) return 77;
+	STARPU_CHECK_RETURN_VALUE(ret, "starpu_init");
+
+	dummy_big_cl.dyn_modes = malloc(dummy_big_cl.nbuffers * sizeof(enum starpu_access_mode));
+	for(i=0 ; i<dummy_big_cl.nbuffers ; i++)
+	     dummy_big_cl.dyn_modes[i] = STARPU_RW;
+
+	starpu_variable_data_register(&handle, 0, (uintptr_t)&val, sizeof(int));
+
+	task = starpu_task_create();
+	task->synchronous = 1;
+	task->cl = &dummy_small_cl;
+	starpu_codelet_pack_args(&task->cl_arg, &task->cl_arg_size,
+				 STARPU_VALUE, &(task->cl->nbuffers), sizeof(task->cl->nbuffers),
+				 0);
+	task->dyn_handles = malloc(sizeof(starpu_data_handle_t));
+	task->dyn_handles[0] = handle;
+	ret = starpu_task_submit(task);
+	if (ret == -ENODEV) goto enodev;
+	STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_submit");
+
+	task2 = starpu_task_create();
+	task2->synchronous = 1;
+	task2->cl = &dummy_big_cl;
+	starpu_codelet_pack_args(&task2->cl_arg, &task2->cl_arg_size,
+				 STARPU_VALUE, &task2->cl->nbuffers, sizeof(task2->cl->nbuffers),
+				 0);
+	task2->dyn_handles = malloc(task2->cl->nbuffers * sizeof(starpu_data_handle_t));
+	for(i=0 ; i<task2->cl->nbuffers ; i++)
+	{
+		task2->dyn_handles[i] = handle;
+	}
+	ret = starpu_task_submit(task2);
+	if (ret == -ENODEV) goto enodev;
+	STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_submit");
+
+	ret = starpu_insert_task(&dummy_small_cl,
+				 STARPU_VALUE, &dummy_small_cl.nbuffers, sizeof(dummy_small_cl.nbuffers),
+				 STARPU_RW, handle,
+				 0);
+	if (ret == -ENODEV) goto enodev;
+	STARPU_CHECK_RETURN_VALUE(ret, "starpu_insert_task");
+        ret = starpu_task_wait_for_all();
+	STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_wait_for_all");
+
+	handles = malloc(dummy_big_cl.nbuffers * sizeof(starpu_data_handle_t));
+	for(i=0 ; i<dummy_big_cl.nbuffers ; i++)
+	{
+		handles[i] = handle;
+	}
+	ret = starpu_insert_task(&dummy_big_cl,
+				 STARPU_VALUE, &dummy_big_cl.nbuffers, sizeof(dummy_big_cl.nbuffers),
+				 STARPU_DATA_ARRAY, handles, dummy_big_cl.nbuffers,
+				 0);
+	if (ret == -ENODEV) goto enodev;
+	STARPU_CHECK_RETURN_VALUE(ret, "starpu_insert_task");
+        ret = starpu_task_wait_for_all();
+	STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_wait_for_all");
+	free(handles);
+
+	starpu_data_unregister(handle);
+	free(dummy_big_cl.dyn_modes);
+	starpu_shutdown();
+
+	return EXIT_SUCCESS;
+
+enodev:
+	starpu_data_unregister(handle);
+	free(dummy_big_cl.dyn_modes);
+	starpu_shutdown();
+	return 77;
+}