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/*
* This file is part of the PCEPlib, a PCEP protocol library.
*
* Copyright (C) 2020 Volta Networks https://voltanet.io/
*
* This 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 2 of the License, or (at your option) any later version.
*
* This 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 <https://www.gnu.org/licenses/>.
*
* Author : Brady Johnson <brady@voltanet.io>
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <errno.h>
#include <stddef.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/select.h>
#include "pcep_timers_event_loop.h"
#include "pcep_timer_internals.h"
#include "pcep_utils_ordered_list.h"
#include "pcep_utils_logging.h"
#include "pcep_utils_memory.h"
/* For each expired timer: remove the timer from the list, call the
* expire_handler, and free the timer. */
void walk_and_process_timers(pcep_timers_context *timers_context)
{
pthread_mutex_lock(&timers_context->timer_list_lock);
bool keep_walking = true;
ordered_list_node *timer_node = timers_context->timer_list->head;
time_t now = time(NULL);
pcep_timer *timer_data;
/* the timers are sorted by expire_time, so we will only
* remove the top node each time through the loop */
while (timer_node != NULL && keep_walking) {
timer_data = (pcep_timer *)timer_node->data;
if (timer_data->expire_time <= now) {
timer_node = timer_node->next_node;
ordered_list_remove_first_node(
timers_context->timer_list);
/* call the timer expired handler */
timers_context->expire_handler(timer_data->data,
timer_data->timer_id);
pceplib_free(PCEPLIB_INFRA, timer_data);
} else {
keep_walking = false;
}
}
pthread_mutex_unlock(&timers_context->timer_list_lock);
}
/* pcep_timers::initialize() will create a thread and invoke this method */
void *event_loop(void *context)
{
if (context == NULL) {
pcep_log(
LOG_WARNING,
"%s: pcep_timers_event_loop cannot start event_loop with NULL data",
__func__);
return NULL;
}
pcep_log(LOG_NOTICE, "%s: [%ld-%ld] Starting timers_event_loop thread",
__func__, time(NULL), pthread_self());
pcep_timers_context *timers_context = (pcep_timers_context *)context;
struct timeval timer;
int retval;
while (timers_context->active) {
/* check the timers every half second */
timer.tv_sec = 0;
timer.tv_usec = 500000;
do {
/* if the select() call gets interrupted, select() will
* set the remaining time in timer, so we need to call
* it again.
*/
retval = select(0, NULL, NULL, NULL, &timer);
} while (retval != 0 && errno == EINTR);
walk_and_process_timers(timers_context);
}
pcep_log(LOG_WARNING, "%s: [%ld-%ld] Finished timers_event_loop thread",
__func__, time(NULL), pthread_self());
return NULL;
}
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