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/*************************************************************************
* Copyright (C) 2009-2010 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library 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 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library 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 for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/*
* An interface for asynchronous tasks. *_async() versions of functions
* return a dmnsn_progress* object which can indicate the progress of the
* background task, and wait for task completion. The task's return value
* is returned as an int from dmnsn_finish_progress().
*/
#ifndef DIMENSION_PROGRESS_H
#define DIMENSION_PROGRESS_H
#include <pthread.h>
/* A single element in an array for dmnsn_progress. Progress of this item is
progress/total. */
typedef struct {
unsigned int progress, total;
} dmnsn_progress_element;
typedef struct {
/* Array of progress elements. Progress is given by P(0), where
P(i) = (elements[i].progress + P(i + 1))/elements[i].total. */
dmnsn_array *elements;
/* The worker thread */
pthread_t thread;
/* Read-write synchronization */
pthread_rwlock_t *rwlock;
/* Condition variable for waiting for a particular amount of progress */
pthread_cond_t *cond;
pthread_mutex_t *mutex;
} dmnsn_progress;
/* Allocate a new progress object */
dmnsn_progress *dmnsn_new_progress();
/* For failed returns from *_async() functions */
void dmnsn_delete_progress(dmnsn_progress *progress);
/* Join the worker thread and returns it's integer return value in addition to
deleting `progress' */
int dmnsn_finish_progress(dmnsn_progress *progress);
/* Get the progress of the background task, out of 1.0 */
double dmnsn_get_progress(const dmnsn_progress *progress);
/* Wait for the progress to be >= prog, in a better way than spinlocking */
void dmnsn_wait_progress(const dmnsn_progress *progress, double prog);
/* Create a new level of loop nesting */
void dmnsn_new_progress_element(dmnsn_progress *progress, unsigned int total);
/* Increment the progress counter; should only be called from innermost loop */
void dmnsn_increment_progress(dmnsn_progress *progress);
/* Instantly complete the progress */
void dmnsn_done_progress(dmnsn_progress *progress);
#endif /* DIMENSION_PROGRESS_H */
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