/* StarPU --- Runtime system for heterogeneous multicore architectures.
 *
 * Copyright (C) 2010, 2014  Université de Bordeaux
 * Copyright (C) 2010, 2011, 2012, 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 <config.h>
#include <starpu.h>
#include "../helper.h"

#ifdef STARPU_QUICK_CHECK
static unsigned ntasks = 10;
#else
static unsigned ntasks = 10000;
#endif

#ifdef STARPU_USE_CUDA
extern void increment_cuda(void *descr[], STARPU_ATTRIBUTE_UNUSED void *_args);
#endif
#ifdef STARPU_USE_OPENCL
extern void increment_opencl(void *buffers[], void *args);
#endif

void increment_cpu(void *descr[], STARPU_ATTRIBUTE_UNUSED void *_args)
{
	unsigned *tokenptr = (unsigned *)STARPU_VARIABLE_GET_PTR(descr[0]);
	(*tokenptr)++;
}

static struct starpu_codelet increment_cl =
{
	.modes = { STARPU_RW },
	.cpu_funcs = {increment_cpu, NULL},
#ifdef STARPU_USE_CUDA
	.cuda_funcs = {increment_cuda, NULL},
	.cuda_flags = {STARPU_CUDA_ASYNC},
#endif
#ifdef STARPU_USE_OPENCL
	.opencl_funcs = {increment_opencl, NULL},
	.opencl_flags = {STARPU_OPENCL_ASYNC},
#endif
	.cpu_funcs_name = {"increment_cpu", NULL},
	.nbuffers = 1
};

unsigned token = 0;
starpu_data_handle_t token_handle;

static
int increment_token(void)
{
	int ret;
	struct starpu_task *task = starpu_task_create();
        task->synchronous = 1;
	task->cl = &increment_cl;
	task->handles[0] = token_handle;
	ret = starpu_task_submit(task);
	return ret;
}

static
void callback(void *arg STARPU_ATTRIBUTE_UNUSED)
{
        starpu_data_release(token_handle);
}

#ifdef STARPU_USE_OPENCL
struct starpu_opencl_program opencl_program;
#endif
int main(int argc, char **argv)
{
	unsigned i;
	int ret;

        ret = starpu_initialize(NULL, &argc, &argv);
	if (ret == -ENODEV) return STARPU_TEST_SKIPPED;
	STARPU_CHECK_RETURN_VALUE(ret, "starpu_init");

#ifdef STARPU_USE_OPENCL
	ret = starpu_opencl_load_opencl_from_file("tests/datawizard/acquire_release_opencl_kernel.cl",
						  &opencl_program, NULL);
	STARPU_CHECK_RETURN_VALUE(ret, "starpu_opencl_load_opencl_from_file");
#endif
	starpu_variable_data_register(&token_handle, STARPU_MAIN_RAM, (uintptr_t)&token, sizeof(unsigned));

        FPRINTF(stderr, "Token: %u\n", token);

	for(i=0; i<ntasks; i++)
	{
		/* synchronize data in RAM */
                ret = starpu_data_acquire(token_handle, STARPU_R);
		STARPU_CHECK_RETURN_VALUE(ret, "starpu_data_acquire");

                token ++;
                starpu_data_release(token_handle);

                ret = increment_token();
		if (ret == -ENODEV) goto enodev;
		STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_submit");

                ret = starpu_data_acquire_cb(token_handle, STARPU_RW, callback, NULL);
		STARPU_CHECK_RETURN_VALUE(ret, "starpu_data_acquire_cb");
	}

	starpu_data_unregister(token_handle);

#ifdef STARPU_USE_OPENCL
        ret = starpu_opencl_unload_opencl(&opencl_program);
        STARPU_CHECK_RETURN_VALUE(ret, "starpu_opencl_unload_opencl");
#endif
	starpu_shutdown();

        FPRINTF(stderr, "Token: %u\n", token);
	if (token == ntasks * 2)
		ret = EXIT_SUCCESS;
	else
		ret = EXIT_FAILURE;
	return ret;

enodev:
	starpu_data_unregister(token_handle);
	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 */
#ifdef STARPU_USE_OPENCL
        ret = starpu_opencl_unload_opencl(&opencl_program);
        STARPU_CHECK_RETURN_VALUE(ret, "starpu_opencl_unload_opencl");
#endif
	starpu_shutdown();
	return STARPU_TEST_SKIPPED;
}