/*
 * StarPU
 * Copyright (C) Université Bordeaux 1, CNRS 2008-2010 (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 <string.h>
#include <math.h>
#include <sys/types.h>
#include <pthread.h>
#include <signal.h>

#include <starpu.h>

#ifdef STARPU_USE_GORDON
#include <gordon/null.h>
#endif

#define TAG(i, iter)	((starpu_tag_t)  (((uint64_t)iter)<<32 | (i)) )

starpu_codelet cl;

#define Ni	64
#define Nk	256

static unsigned ni = Ni, nk = Nk;
static unsigned callback_cnt;
static unsigned iter = 0;

static void parse_args(int argc, char **argv)
{
	int i;
	for (i = 1; i < argc; i++) {
		if (strcmp(argv[i], "-iter") == 0) {
		        char *argptr;
			nk = strtol(argv[++i], &argptr, 10);
		}

		if (strcmp(argv[i], "-i") == 0) {
		        char *argptr;
			ni = strtol(argv[++i], &argptr, 10);
		}

		if (strcmp(argv[i], "-h") == 0) {
			printf("usage : %s [-iter iter] [-i i]\n", argv[0]);
		}
	}
}

void callback_cpu(void *argcb);

static void tag_cleanup_grid(unsigned ni, unsigned iter)
{
	unsigned i;

	for (i = 0; i < ni; i++)
	{
		starpu_tag_remove(TAG(i,iter));
	}


} 

static void create_task_grid(unsigned iter)
{
	unsigned i;

//	fprintf(stderr, "start iter %d ni %d...\n", iter, ni);

	callback_cnt = (ni);

	for (i = 0; i < ni; i++)
	{
		/* create a new task */
		struct starpu_task *task = starpu_task_create();

		task->cl = &cl;
		task->cl_arg = NULL;

		task->use_tag = 1;
		task->tag_id = TAG(i, iter);

		if (i != 0)
			starpu_tag_declare_deps(TAG(i,iter), 1, TAG(i-1,iter));

		starpu_task_submit(task);
	}

}

void cpu_codelet(void *descr[] __attribute__ ((unused)),
			void *_args __attribute__ ((unused)))
{
}

int main(int argc __attribute__((unused)) , char **argv __attribute__((unused)))
{
	unsigned i;

	starpu_init(NULL);

#ifdef STARPU_USE_GORDON
	/* load an empty kernel and get its identifier */
	unsigned gordon_null_kernel = load_gordon_null_kernel();
#endif

	parse_args(argc, argv);

	cl.cpu_func = cpu_codelet;
	cl.cuda_func = cpu_codelet;
#ifdef STARPU_USE_GORDON
	cl.gordon_func = gordon_null_kernel;
#endif
	cl.where = STARPU_CPU|STARPU_CUDA|STARPU_GORDON;
	cl.nbuffers = 0;

	fprintf(stderr, "ITER : %d\n", nk);

	for (i = 0; i < nk; i++)
	{
		create_task_grid(i);

		starpu_tag_wait(TAG(ni-1, i));

		/* cleanup old grids ... */
		if (i > 1)
			tag_cleanup_grid(ni, i-1);
	}

	starpu_shutdown();

	fprintf(stderr, "TEST DONE ...\n");

	return 0;
}
