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/*
* Ouroboros - Copyright (C) 2016 - 2017
*
* Notifier event system using callbacks
*
* Dimitri Staessens <dimitri.staessens@ugent.be>
* Sander Vrijders <sander.vrijders@ugent.be>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* 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 library; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#include <ouroboros/errno.h>
#include <ouroboros/notifier.h>
#include <ouroboros/list.h>
#include <pthread.h>
#include <stdlib.h>
struct listener {
struct list_head next;
notifier_fn_t callback;
};
struct {
struct list_head listeners;
pthread_mutex_t lock;
} notifier;
int notifier_init(void)
{
if (pthread_mutex_init(¬ifier.lock, NULL))
return -1;
list_head_init(¬ifier.listeners);
return 0;
}
void notifier_fini(void)
{
struct list_head * p;
struct list_head * h;
pthread_mutex_lock(¬ifier.lock);
list_for_each_safe(p, h, ¬ifier.listeners) {
struct listener * l = list_entry(p, struct listener, next);
list_del(&l->next);
free(l);
}
pthread_mutex_unlock(¬ifier.lock);
pthread_mutex_destroy(¬ifier.lock);
}
void notifier_event(int event,
const void * o)
{
struct list_head * p;
pthread_mutex_lock(¬ifier.lock);
list_for_each(p, ¬ifier.listeners)
list_entry(p, struct listener, next)->callback(event, o);
pthread_mutex_unlock(¬ifier.lock);
}
int notifier_reg(notifier_fn_t callback)
{
struct listener * l;
struct list_head * p;
pthread_mutex_lock(¬ifier.lock);
list_for_each(p, ¬ifier.listeners) {
struct listener * l = list_entry(p, struct listener, next);
if (l->callback == callback) {
pthread_mutex_unlock(¬ifier.lock);
return -EPERM;
}
}
l = malloc(sizeof(*l));
if (l == NULL) {
pthread_mutex_unlock(¬ifier.lock);
return -ENOMEM;
}
l->callback = callback;
list_add(&l->next, ¬ifier.listeners);
pthread_mutex_unlock(¬ifier.lock);
return 0;
}
void notifier_unreg(notifier_fn_t callback)
{
struct list_head * p;
struct list_head * h;
pthread_mutex_lock(¬ifier.lock);
list_for_each_safe(p, h, ¬ifier.listeners) {
struct listener * l = list_entry(p, struct listener, next);
if (l->callback == callback) {
list_del(&l->next);
free(l);
break;
}
}
pthread_mutex_unlock(¬ifier.lock);
}
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