/* StarPU --- Runtime system for heterogeneous multicore architectures.
 *
 * Copyright (C) 2010  Université de Bordeaux 1
 * Copyright (C) 2010, 2011, 2012  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 <config.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <starpu.h>
#include <stdlib.h>
#include "../helper.h"

#define VECTORSIZE	1024

static unsigned *A, *B, *C, *D;
starpu_data_handle_t A_handle, B_handle, C_handle, D_handle;

static unsigned var = 0;

static void f(void *descr[], __attribute__ ((unused)) void *_args)
{
	STARPU_SKIP_IF_VALGRIND;

	usleep(200000);
}

static struct starpu_codelet cl_f =
{
	.modes = { STARPU_R, STARPU_RW },
	.where = STARPU_CPU|STARPU_CUDA,
	.cpu_funcs = {f, NULL},
	.cuda_funcs = {f, NULL},
	.nbuffers = 2
};

static void g(void *descr[], __attribute__ ((unused)) void *_args)
{
	STARPU_SKIP_IF_VALGRIND;

	usleep(100000);
	var = 42;
}

static struct starpu_codelet cl_g =
{
	.modes = { STARPU_R, STARPU_RW },
	.where = STARPU_CPU|STARPU_CUDA,
	.cpu_funcs = {g, NULL},
	.cuda_funcs = {g, NULL},
	.nbuffers = 2
};

static void h(void *descr[], __attribute__ ((unused)) void *_args)
{
	STARPU_SKIP_IF_VALGRIND;

	FPRINTF(stderr, "VAR %u (should be 42)\n", var);
	STARPU_ASSERT(var == 42);
}

static struct starpu_codelet cl_h =
{
	.modes = { STARPU_R, STARPU_RW },
	.where = STARPU_CPU|STARPU_CUDA,
	.cpu_funcs = {h, NULL},
	.cuda_funcs = {h, NULL},
	.nbuffers = 2
};

int main(int argc, char **argv)
{
	int ret;

	ret = starpu_init(NULL);
	if (ret == -ENODEV) return STARPU_TEST_SKIPPED;
	STARPU_CHECK_RETURN_VALUE(ret, "starpu_init");

	A = (unsigned *) malloc(VECTORSIZE*sizeof(unsigned));
	B = (unsigned *) malloc(VECTORSIZE*sizeof(unsigned));
	C = (unsigned *) malloc(VECTORSIZE*sizeof(unsigned));
	D = (unsigned *) malloc(VECTORSIZE*sizeof(unsigned));

	starpu_vector_data_register(&A_handle, 0, (uintptr_t)A, VECTORSIZE, sizeof(unsigned));
	starpu_vector_data_register(&B_handle, 0, (uintptr_t)B, VECTORSIZE, sizeof(unsigned));
	starpu_vector_data_register(&C_handle, 0, (uintptr_t)C, VECTORSIZE, sizeof(unsigned));
	starpu_vector_data_register(&D_handle, 0, (uintptr_t)D, VECTORSIZE, sizeof(unsigned));

#if 0
	starpu_data_set_sequential_consistency_flag(A_handle, 0);
	starpu_data_set_sequential_consistency_flag(B_handle, 0);
	starpu_data_set_sequential_consistency_flag(C_handle, 0);
	starpu_data_set_sequential_consistency_flag(D_handle, 0);
#endif

	/* 	f(Ar, Brw): sleep 
	 *	g(Br; Crw); sleep, var = 42
	 *	h(Cr; Drw); check that var == 42
	 */
	struct starpu_task *task_f = starpu_task_create();
	task_f->cl = &cl_f;
	task_f->handles[0] = A_handle;
	task_f->handles[1] = B_handle;
	ret = starpu_task_submit(task_f);
	if (ret == -ENODEV) goto enodev;
	STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_submit");

	struct starpu_task *task_g = starpu_task_create();
	task_g->cl = &cl_g;
	task_g->handles[0] = B_handle;
	task_g->handles[1] = C_handle;
	ret = starpu_task_submit(task_g);
	if (ret == -ENODEV) goto enodev;
	STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_submit");

	struct starpu_task *task_h = starpu_task_create();
	task_h->cl = &cl_h;
	task_h->handles[0] = C_handle;
	task_h->handles[1] = D_handle;
	ret = starpu_task_submit(task_h);
	if (ret == -ENODEV) goto enodev;
	STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_submit");

	ret = starpu_task_wait_for_all();
	STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_wait_for_all");

	starpu_data_unregister(A_handle);
	starpu_data_unregister(B_handle);
	starpu_data_unregister(C_handle);
	starpu_data_unregister(D_handle);

	free(A);
	free(B);
	free(C);
	free(D);

	starpu_shutdown();

	return EXIT_SUCCESS;

enodev:
	free(A);
	free(B);
	free(C);
	free(D);
	fprintf(stderr, "WARNING: No one can execute this task\n");
	/* yes, we do not perform the computation but we did detect that no one
 	 * could perform the kernel, so this is not an error from StarPU */
	starpu_shutdown();
	return STARPU_TEST_SKIPPED;
}