/*
 * 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 <pthread.h>
#include <stdio.h>
#include <unistd.h>

#include <starpu.h>

static void *dummy_func(void *arg __attribute__ ((unused)))
{
	return NULL;
}

static starpu_codelet dummy_codelet = 
{
	.where = ANY,
	.core_func = dummy_func,
	.cublas_func = dummy_func,
	.model = NULL,
	.nbuffers = 0
};

static void callback(void *tag)
{
	fflush(stderr);
	fprintf(stderr, "Callback for tag %p\n", tag);
	fflush(stderr);
}

static struct starpu_task *create_dummy_task(starpu_tag_t tag)
{
	struct starpu_task *task = starpu_task_create();

	task->cl = &dummy_codelet;
	task->cl_arg = NULL;
	task->callback_func = callback;
	task->callback_arg = tag;

	task->use_tag = 1;
	task->tag_id = tag;

	task->cleanup = 0;

	return task;
}

#define tagA	0x42
#define tagB	0x12300

#define tagC	0x32
#define tagD	0x52
#define tagE	0x19999
#define tagF	0x2312
#define tagG	0x1985

#define tagH	0x32234
#define tagI	0x5234
#define tagJ	0x199
#define tagK	0x231234
#define tagL	0x2345


int main(int argc, char **argv)
{
	starpu_init(NULL);

	fprintf(stderr, "{ A } -> { B }\n");
	fflush(stderr);

	struct starpu_task *taskA, *taskB;
	
	taskA = create_dummy_task(tagA);
	taskB = create_dummy_task(tagB);

	/* B depends on A */
	starpu_tag_declare_deps(tagB, 1, tagA);

	starpu_submit_task(taskB);
	starpu_submit_task(taskA);

	starpu_tag_wait(tagB);
	
	fflush(stderr);
	fprintf(stderr, "{ C, D, E, F } -> { G }\n");
	fflush(stderr);

	struct starpu_task *taskC, *taskD, *taskE, *taskF, *taskG;

	taskC = create_dummy_task(tagC);
	taskD = create_dummy_task(tagD);
	taskE = create_dummy_task(tagE);
	taskF = create_dummy_task(tagF);
	taskG = create_dummy_task(tagG);

	/* NB: we could have used starpu_tag_declare_deps_array instead */
	starpu_tag_declare_deps(tagG, 4, tagC, tagD, tagE, tagF);

	starpu_submit_task(taskC);
	starpu_submit_task(taskD);
	starpu_submit_task(taskG);
	starpu_submit_task(taskE);
	starpu_submit_task(taskF);

	starpu_tag_wait(tagG);

	fflush(stderr);
	fprintf(stderr, "{ H, I } -> { J, K, L }\n");
	fflush(stderr);
	
	struct starpu_task *taskH, *taskI, *taskJ, *taskK, *taskL;

	taskH = create_dummy_task(tagH);
	taskI = create_dummy_task(tagI);
	taskJ = create_dummy_task(tagJ);
	taskK = create_dummy_task(tagK);
	taskL = create_dummy_task(tagL);

	starpu_tag_declare_deps(tagJ, 2, tagH, tagI);
	starpu_tag_declare_deps(tagK, 2, tagH, tagI);
	starpu_tag_declare_deps(tagL, 2, tagH, tagI);

	starpu_tag_t tagJKL[3] = {tagJ, tagK, tagL};

	starpu_tag_wait_array(3, tagJKL);

	starpu_shutdown();

	return 0;
}