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/*
* Ouroboros - Copyright (C) 2016
*
* The IPC Resource Manager - Registered Application Instances
*
* Dimitri Staessens <dimitri.staessens@intec.ugent.be>
* Sander Vrijders <sander.vrijders@intec.ugent.be>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "reg_api.h"
#include <stdlib.h>
#include <stdbool.h>
struct reg_api * reg_api_create(pid_t api)
{
struct reg_api * i;
i = malloc(sizeof(*i));
if (i == NULL)
return NULL;
i->api = api;
i->state = REG_I_INIT;
pthread_mutex_init(&i->state_lock, NULL);
pthread_cond_init(&i->state_cond, NULL);
INIT_LIST_HEAD(&i->next);
return i;
}
void reg_api_destroy(struct reg_api * i)
{
if (i == NULL)
return;
pthread_mutex_lock(&i->state_lock);
if (i->state != REG_I_NULL)
i->state = REG_I_DESTROY;
pthread_cond_signal(&i->state_cond);
pthread_mutex_unlock(&i->state_lock);
pthread_cleanup_push((void(*)(void *)) pthread_mutex_unlock,
(void *) &i->state_lock);
while (i->state != REG_I_NULL)
pthread_cond_wait(&i->state_cond, &i->state_lock);
pthread_cleanup_pop(true);
pthread_cond_destroy(&i->state_cond);
pthread_mutex_destroy(&i->state_lock);
free(i);
}
static void cleanup_sleeper(void * o) {
struct reg_api * i = (struct reg_api *) o;
i->state = REG_I_NULL;
pthread_cond_signal(&i->state_cond);
pthread_mutex_unlock(&i->state_lock);
}
void reg_api_sleep(struct reg_api * i)
{
if (i == NULL)
return;
pthread_mutex_lock(&i->state_lock);
if (i->state != REG_I_INIT) {
pthread_mutex_unlock(&i->state_lock);
return;
}
i->state = REG_I_SLEEP;
pthread_cleanup_push(cleanup_sleeper, (void *) i);
while (i->state == REG_I_SLEEP)
pthread_cond_wait(&i->state_cond, &i->state_lock);
pthread_cleanup_pop(true);
}
void reg_api_wake(struct reg_api * i)
{
pthread_mutex_lock(&i->state_lock);
if (i->state == REG_I_NULL) {
pthread_mutex_unlock(&i->state_lock);
return;
}
i->state = REG_I_WAKE;
pthread_cond_broadcast(&i->state_cond);
while (i->state == REG_I_WAKE)
pthread_cond_wait(&i->state_cond, &i->state_lock);
pthread_mutex_unlock(&i->state_lock);
}
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