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/*************************************************************************
* Copyright (C) 2008 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/>. *
*************************************************************************/
#include "dimension.h"
#include <pthread.h>
#include <stdlib.h> /* For malloc */
dmnsn_progress *
dmnsn_new_progress()
{
dmnsn_progress_element element = { .progress = 0, .total = 1 };
dmnsn_progress *progress = malloc(sizeof(dmnsn_progress));
if (progress) {
progress->elements = dmnsn_new_array(sizeof(dmnsn_progress_element));
dmnsn_array_push(progress->elements, &element);
if (pthread_cond_init(&progress->cond, NULL) != 0) {
dmnsn_error(DMNSN_SEVERITY_MEDIUM,
"Couldn't initialize condition variable.");
}
if (pthread_mutex_init(&progress->mutex, NULL) != 0) {
dmnsn_error(DMNSN_SEVERITY_MEDIUM, "Couldn't initialize mutex.");
}
}
return progress;
}
void
dmnsn_delete_progress(dmnsn_progress *progress)
{
if (progress) {
if (pthread_mutex_destroy(&progress->mutex) != 0) {
dmnsn_error(DMNSN_SEVERITY_LOW, "Leaking mutex.");
}
if (pthread_cond_destroy(&progress->cond) != 0) {
dmnsn_error(DMNSN_SEVERITY_LOW, "Leaking condition variable.");
}
dmnsn_delete_array(progress->elements);
free(progress);
}
}
int dmnsn_finish_progress(dmnsn_progress *progress)
{
void *ptr;
int retval = 1;
if (progress) {
if (pthread_cond_broadcast(&progress->cond) != 0) {
dmnsn_error(DMNSN_SEVERITY_MEDIUM, "Couldn't signal condition variable.");
}
if (pthread_join(progress->thread, &ptr) != 0) {
/* Medium severity because an unjoined thread likely means that the thread
is incomplete or invalid */
dmnsn_error(DMNSN_SEVERITY_MEDIUM, "Joining worker thread failed.");
} else if (ptr) {
retval = *(int *)ptr;
free(ptr);
}
dmnsn_delete_progress(progress);
}
return retval;
}
double
dmnsn_get_progress(const dmnsn_progress *progress)
{
dmnsn_progress_element *element;
double prog = 0.0;
unsigned int i;
dmnsn_array_rdlock(progress->elements);
for (i = 0; i < progress->elements->length; ++i) {
element = dmnsn_array_at(progress->elements,
progress->elements->length - i - 1);
prog += element->progress;
prog /= element->total;
}
dmnsn_array_unlock(progress->elements);
return prog;
}
void
dmnsn_new_progress_element(dmnsn_progress *progress, unsigned int total)
{
dmnsn_progress_element element = { .progress = 0, .total = total };
dmnsn_array_push(progress->elements, &element);
}
void
dmnsn_increment_progress(dmnsn_progress *progress)
{
dmnsn_progress_element *element;
dmnsn_array_wrlock(progress->elements);
element = dmnsn_array_at(progress->elements, progress->elements->length - 1);
++element->progress;
while (element->progress >= element->total
&& progress->elements->length > 1) {
dmnsn_array_resize_unlocked(progress->elements,
progress->elements->length - 1);
element = dmnsn_array_at(progress->elements, progress->elements->length - 1);
++element->progress;
}
if (pthread_cond_broadcast(&progress->cond) != 0) {
dmnsn_error(DMNSN_SEVERITY_MEDIUM, "Couldn't signal condition variable.");
}
dmnsn_array_unlock(progress->elements);
}
/* Immediately set to 100% completion */
void
dmnsn_progress_done(dmnsn_progress *progress)
{
dmnsn_progress_element *element;
dmnsn_array_wrlock(progress->elements);
dmnsn_array_resize_unlocked(progress->elements, 1);
element = dmnsn_array_at(progress->elements, progress->elements->length - 1);
element->progress = element->total;
if (pthread_cond_broadcast(&progress->cond) != 0) {
dmnsn_error(DMNSN_SEVERITY_MEDIUM, "Couldn't signal condition variable.");
}
dmnsn_array_unlock(progress->elements);
}
/* Wait until dmnsn_get_progress(progress) >= prog */
void
dmnsn_wait_progress(dmnsn_progress *progress, double prog)
{
if (pthread_mutex_lock(&progress->mutex) != 0) {
dmnsn_error(DMNSN_SEVERITY_MEDIUM, "Couldn't lock condition mutex.");
}
while (dmnsn_get_progress(progress) < prog) {
if (pthread_cond_wait(&progress->cond, &progress->mutex) != 0) {
dmnsn_error(DMNSN_SEVERITY_MEDIUM,
"Couldn't wait on condition variable.");
}
}
if (pthread_mutex_unlock(&progress->mutex) != 0) {
dmnsn_error(DMNSN_SEVERITY_MEDIUM, "Couldn't unlock condition mutex.");
}
}
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