/* StarPU --- Runtime system for heterogeneous multicore architectures.
 *
 * Copyright (C) 2010,2011 University of Bordeaux
 *
 * 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 "socl.h"

static void mapbuffer_callback(void *args) {
	command_map_buffer cmd = (command_map_buffer)args;

	starpu_tag_notify_from_apps(cmd->event->id);
	cmd->event->status = CL_COMPLETE;
}

static void mapbuffer_task(void *args) {
	command_map_buffer cmd = (command_map_buffer)args;

	enum starpu_access_mode mode = (cmd->map_flags == CL_MAP_READ ? STARPU_R : STARPU_RW);

	starpu_data_acquire_cb(cmd->buffer->handle, mode, mapbuffer_callback, cmd);
}

cl_int command_map_buffer_submit(command_map_buffer cmd) {
	starpu_task task = task_create_cpu(mapbuffer_task, cmd, 0);

	task_submit(task, cmd);

	return CL_SUCCESS;
}

CL_API_ENTRY void * CL_API_CALL
soclEnqueueMapBuffer(cl_command_queue cq,
                   cl_mem           buffer,
                   cl_bool          blocking, 
                   cl_map_flags     map_flags,
                   size_t           offset, 
                   size_t           cb,
                   cl_uint          num_events,
                   const cl_event * events,
                   cl_event *       event,
                   cl_int *         errcode_ret) CL_API_SUFFIX__VERSION_1_0
{
	cl_event ev = event_create();

	command_map_buffer cmd = command_map_buffer_create(buffer, map_flags, offset, cb, ev);

	command_queue_enqueue(cq, cmd, num_events, events);

	if (errcode_ret != NULL)
		*errcode_ret = CL_SUCCESS;

	RETURN_CUSTOM_EVENT(ev,event);

	MAY_BLOCK_CUSTOM(blocking,ev);
	
	return (void*)(starpu_variable_get_local_ptr(buffer->handle) + offset);
}