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/*************************************************************************
* Copyright (C) 2010-2014 Tavian Barnes <tavianator@tavianator.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/>. *
*************************************************************************/
/**
* @file
* Future object implementation.
*/
#include <pthread.h>
/** Allocate a new future object. */
DMNSN_INTERNAL dmnsn_future *dmnsn_new_future(void);
/** Set the total number of loop iterations. */
DMNSN_INTERNAL void dmnsn_future_set_total(dmnsn_future *future, size_t total);
/** Increment the progress of a background task. */
DMNSN_INTERNAL void dmnsn_future_increment(dmnsn_future *future);
/** Instantly complete the background teask. */
DMNSN_INTERNAL void dmnsn_future_finish(dmnsn_future *future);
/** Set the number of worker threads. */
DMNSN_INTERNAL void dmnsn_future_set_nthreads(dmnsn_future *future,
unsigned int nthreads);
/** Notify completion of a worker thread. */
DMNSN_INTERNAL void dmnsn_future_finish_thread(dmnsn_future *future);
struct dmnsn_future {
size_t progress; /**< Completed loop iterations. */
size_t total; /**< Total expected loop iterations. */
/** The worker thread. */
pthread_t thread;
/** Mutex to guard progress and total. */
pthread_mutex_t mutex;
/** Condition variable for waiting for a particular amount of progress. */
pthread_cond_t cond;
/** Minimum waited-on value. */
double min_wait;
/** Number of threads working on the future's background task. */
unsigned int nthreads;
/** Number of threads not yet paused. */
unsigned int nrunning;
/** Count of threads holding the future paused. */
unsigned int npaused;
/** Condition variable for waiting for nrunning == 0. */
pthread_cond_t none_running_cond;
/** Condition variable for waiting for nrunning == nthreads. */
pthread_cond_t all_running_cond;
/** Condition variable for waiting for npaused == 0. */
pthread_cond_t resume_cond;
};
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