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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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