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/*************************************************************************
* Copyright (C) 2009-2011 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
* Progress objects.
*/
#include "dimension-internal.h"
#include <pthread.h>
/* Allocate a new dmnsn_progress* */
dmnsn_progress *
dmnsn_new_progress(void)
{
dmnsn_progress *progress = dmnsn_malloc(sizeof(dmnsn_progress));
progress->progress = 0;
progress->total = 1;
/* Initialize the rwlock, condition variable, and mutex */
progress->rwlock = dmnsn_malloc(sizeof(pthread_rwlock_t));
dmnsn_initialize_rwlock(progress->rwlock);
progress->cond = dmnsn_malloc(sizeof(pthread_cond_t));
dmnsn_initialize_cond(progress->cond);
progress->mutex = dmnsn_malloc(sizeof(pthread_mutex_t));
dmnsn_initialize_mutex(progress->mutex);
progress->min_wait = dmnsn_malloc(sizeof(double));
*progress->min_wait = 1.0;
return progress;
}
/* Join the worker thread and delete `progress'. */
int
dmnsn_finish_progress(dmnsn_progress *progress)
{
void *ptr;
int retval = -1;
if (progress) {
/* Get the thread's return value */
dmnsn_join_thread(progress->thread, &ptr);
if (ptr && ptr != PTHREAD_CANCELED) {
retval = *(int *)ptr;
dmnsn_free(ptr);
}
/* Free the progress object */
dmnsn_free(progress->min_wait);
dmnsn_destroy_mutex(progress->mutex);
dmnsn_free(progress->mutex);
dmnsn_destroy_cond(progress->cond);
dmnsn_free(progress->cond);
dmnsn_destroy_rwlock(progress->rwlock);
dmnsn_free(progress->rwlock);
dmnsn_free(progress);
}
return retval;
}
/* Cancel a background thread */
void
dmnsn_cancel_progress(dmnsn_progress *progress)
{
pthread_cancel(progress->thread);
}
/* Get the current progress of the worker thread, in [0.0, 1.0] */
double
dmnsn_get_progress(const dmnsn_progress *progress)
{
double prog;
dmnsn_read_lock(progress->rwlock);
prog = (double)progress->progress/progress->total;
dmnsn_unlock_rwlock(progress->rwlock);
return prog;
}
/* Wait until dmnsn_get_progress(progress) >= prog */
void
dmnsn_wait_progress(const dmnsn_progress *progress, double prog)
{
dmnsn_lock_mutex(progress->mutex);
while (dmnsn_get_progress(progress) < prog) {
/* Set the minimum waited-on value */
if (prog < *progress->min_wait)
*progress->min_wait = prog;
dmnsn_cond_wait(progress->cond, progress->mutex);
}
dmnsn_unlock_mutex(progress->mutex);
}
/* Set the total number of loop iterations */
void
dmnsn_set_progress_total(dmnsn_progress *progress, size_t total)
{
dmnsn_write_lock(progress->rwlock);
progress->total = total;
dmnsn_unlock_rwlock(progress->rwlock);
}
/* Increment the number of completed loop iterations */
void
dmnsn_increment_progress(dmnsn_progress *progress)
{
/* Allow a thread to be canceled whenever it increments a progress object --
this is close to PTHREAD_CANCEL_ASYNCHRONOUS but allows consistent state
on cancellation */
pthread_testcancel();
dmnsn_write_lock(progress->rwlock);
++progress->progress;
dmnsn_unlock_rwlock(progress->rwlock);
dmnsn_lock_mutex(progress->mutex);
if (dmnsn_get_progress(progress) >= *progress->min_wait) {
*progress->min_wait = 1.0;
dmnsn_cond_broadcast(progress->cond);
}
dmnsn_unlock_mutex(progress->mutex);
}
/* Immediately set to 100% completion */
void
dmnsn_done_progress(dmnsn_progress *progress)
{
dmnsn_write_lock(progress->rwlock);
progress->progress = progress->total;
dmnsn_unlock_rwlock(progress->rwlock);
dmnsn_lock_mutex(progress->mutex);
dmnsn_cond_broadcast(progress->cond);
dmnsn_unlock_mutex(progress->mutex);
}
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