/* * Ouroboros - Copyright (C) 2016 - 2017 * * The IPC Resource Manager - Application Instance Table * * Dimitri Staessens <dimitri.staessens@ugent.be> * Sander Vrijders <sander.vrijders@ugent.be> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * 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 <ouroboros/config.h> #include <ouroboros/list.h> #include <ouroboros/errno.h> #include <ouroboros/time_utils.h> #include "api_table.h" #include "registry.h" #include <stdlib.h> #include <unistd.h> #include <limits.h> #include <assert.h> #define ENTRY_SLEEP_TIMEOUT 10 /* ms */ struct api_entry * api_entry_create(pid_t api, char * apn) { struct api_entry * e; pthread_condattr_t cattr; assert(apn); e = malloc(sizeof(*e)); if (e == NULL) return NULL; list_head_init(&e->next); list_head_init(&e->names); e->api = api; e->apn = apn; e->daf_name = NULL; e->re = NULL; e->state = API_INIT; if (pthread_condattr_init(&cattr)) { free(e); return NULL; } #ifndef __APPLE__ pthread_condattr_setclock(&cattr, PTHREAD_COND_CLOCK); #endif if (pthread_mutex_init(&e->state_lock, NULL)) { free(e); return NULL; } if (pthread_cond_init(&e->state_cond, &cattr)) { pthread_mutex_destroy(&e->state_lock); free(e); return NULL; } return e; } void api_entry_destroy(struct api_entry * e) { struct list_head * p; struct list_head * h; assert(e); pthread_mutex_lock(&e->state_lock); if (e->state == API_DESTROY) { pthread_mutex_unlock(&e->state_lock); return; } if (e->state == API_SLEEP) e->state = API_DESTROY; pthread_cond_signal(&e->state_cond); while (e->state != API_INIT) pthread_cond_wait(&e->state_cond, &e->state_lock); pthread_mutex_unlock(&e->state_lock); pthread_cond_destroy(&e->state_cond); pthread_mutex_destroy(&e->state_lock); if (e->apn != NULL) free(e->apn); list_for_each_safe(p, h, &e->names) { struct str_el * n = list_entry(p, struct str_el, next); list_del(&n->next); if (n->str != NULL) free(n->str); free(n); } free(e); } int api_entry_add_name(struct api_entry * e, char * name) { struct str_el * s; assert(e); assert(name); s = malloc(sizeof(*s)); if (s == NULL) return -ENOMEM; s->str = name; list_add(&s->next, &e->names); return 0; } void api_entry_del_name(struct api_entry * e, char * name) { struct list_head * p = NULL; struct list_head * h = NULL; assert(e); assert(name); list_for_each_safe(p, h, &e->names) { struct str_el * s = list_entry(p, struct str_el, next); if (!wildcard_match(name, s->str)) { list_del(&s->next); if (s->str != NULL) free(s->str); free(s); } } } void api_entry_cancel(struct api_entry * e) { pthread_mutex_lock(&e->state_lock); e->state = API_INIT; pthread_cond_broadcast(&e->state_cond); pthread_mutex_unlock(&e->state_lock); } int api_entry_sleep(struct api_entry * e) { struct timespec timeout = {(ENTRY_SLEEP_TIMEOUT / 1000), (ENTRY_SLEEP_TIMEOUT % 1000) * MILLION}; struct timespec now; struct timespec dl; int ret = 0; assert(e); clock_gettime(PTHREAD_COND_CLOCK, &now); ts_add(&now, &timeout, &dl); pthread_mutex_lock(&e->state_lock); if (e->state != API_WAKE && e->state != API_DESTROY) e->state = API_SLEEP; while (e->state == API_SLEEP && ret != -ETIMEDOUT) ret = -pthread_cond_timedwait(&e->state_cond, &e->state_lock, &dl); if (e->state == API_DESTROY) { if (e->re != NULL) reg_entry_del_api(e->re, e->api); ret = -1; } if (ret != -ETIMEDOUT) e->state = API_INIT; pthread_cond_broadcast(&e->state_cond); pthread_mutex_unlock(&e->state_lock); return ret; } void api_entry_wake(struct api_entry * e, struct reg_entry * re) { assert(e); assert(re); pthread_mutex_lock(&e->state_lock); if (e->state != API_SLEEP) { pthread_mutex_unlock(&e->state_lock); return; } e->state = API_WAKE; e->re = re; pthread_cond_broadcast(&e->state_cond); while (e->state == API_WAKE) pthread_cond_wait(&e->state_cond, &e->state_lock); if (e->state == API_DESTROY) e->state = API_INIT; pthread_mutex_unlock(&e->state_lock); } int api_table_add(struct list_head * api_table, struct api_entry * e) { assert(api_table); assert(e); list_add(&e->next, api_table); return 0; } void api_table_del(struct list_head * api_table, pid_t api) { struct list_head * p; struct list_head * h; assert(api_table); list_for_each_safe(p, h, api_table) { struct api_entry * e = list_entry(p, struct api_entry, next); if (api == e->api) { list_del(&e->next); api_entry_destroy(e); } } } struct api_entry * api_table_get(struct list_head * api_table, pid_t api) { struct list_head * h; assert(api_table); list_for_each(h, api_table) { struct api_entry * e = list_entry(h, struct api_entry, next); if (api == e->api) return e; } return NULL; }