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-rw-r--r--src/ipcpd/timerwheel.c366
1 files changed, 0 insertions, 366 deletions
diff --git a/src/ipcpd/timerwheel.c b/src/ipcpd/timerwheel.c
deleted file mode 100644
index 6086181a..00000000
--- a/src/ipcpd/timerwheel.c
+++ /dev/null
@@ -1,366 +0,0 @@
-/*
- * Ouroboros - Copyright (C) 2016 - 2017
- *
- * Timerwheel
- *
- * 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., http://www.fsf.org/about/contact/.
- */
-
-#include <ouroboros/config.h>
-#include <ouroboros/time_utils.h>
-#include <ouroboros/errno.h>
-#include <ouroboros/list.h>
-
-#include <pthread.h>
-#include <stdlib.h>
-#include <assert.h>
-#include <string.h>
-
-#define FRAC 10 /* accuracy of the timer */
-
-#define tw_used(tw) ((tw->head + tw->elements - tw->tail) & (tw->elements - 1));
-#define tw_free(tw) (tw_used(tw) + 1 < tw->elements)
-#define tw_empty(tw) (tw->head == tw->tail)
-
-enum tw_state {
- TW_NULL = 0,
- TW_RUNNING,
- TW_DESTROY
-};
-
-struct tw_f {
- struct list_head next;
- void (* func)(void *);
- void * arg;
-};
-
-struct tw_el {
- struct list_head funcs;
- struct timespec expiry;
-};
-
-struct timerwheel {
- struct tw_el * wheel;
-
- struct timespec intv;
-
- size_t pos;
-
- struct list_head wq;
-
- pthread_cond_t work;
- pthread_mutex_t lock;
-
- int resolution;
- unsigned int elements;
-
- enum tw_state state;
- pthread_mutex_t s_lock;
-
- pthread_t ticker;
- pthread_t worker;
-};
-
-static void tw_el_fini(struct tw_el * e)
-{
- struct list_head * p;
- struct list_head * h;
-
- list_for_each_safe(p, h, &e->funcs) {
- struct tw_f * f = list_entry(p, struct tw_f, next);
- list_del(&f->next);
- if (f->arg != NULL)
- free(f->arg);
- }
-}
-
-static enum tw_state tw_get_state(struct timerwheel * tw)
-{
- enum tw_state state;
-
- assert(tw);
-
- pthread_mutex_lock(&tw->s_lock);
-
- state = tw->state;
-
- pthread_mutex_unlock(&tw->s_lock);
-
- return state;
-}
-
-static void tw_set_state(struct timerwheel * tw, enum tw_state state)
-{
- assert(tw);
- assert(state != TW_NULL);
-
- pthread_mutex_lock(&tw->s_lock);
-
- tw->state = state;
-
- pthread_mutex_unlock(&tw->s_lock);
-}
-
-static void * worker(void * o)
-{
- struct list_head * p;
- struct list_head * h;
-
- struct timerwheel * tw = (struct timerwheel *) o;
- struct timespec dl;
- struct timespec now;
-
- clock_gettime(PTHREAD_COND_CLOCK, &now);
-
- ts_add(&now, &tw->intv, &dl);
-
- pthread_mutex_lock(&tw->lock);
-
- while (tw_get_state(tw) == TW_RUNNING) {
- if (pthread_cond_timedwait(&tw->work, &tw->lock, &dl)
- == ETIMEDOUT)
- ts_add(&dl, &tw->intv, &dl);
-
- list_for_each_safe(p, h, &tw->wq) {
- struct tw_f * f = list_entry(p, struct tw_f, next);
- list_del(&f->next);
- pthread_mutex_unlock(&tw->lock);
- f->func(f->arg);
- if (f->arg != NULL)
- free(f->arg);
- free(f);
-
- pthread_mutex_lock(&tw->lock);
- }
- }
-
- pthread_mutex_unlock(&tw->lock);
-
- return (void *) o;
-}
-
-static void * movement(void * o)
-{
- struct timerwheel * tw = (struct timerwheel *) o;
- struct timespec now = {0, 0};
- long ms = tw->resolution * tw->elements;
- struct timespec total = {ms / 1000,
- (ms % 1000) * MILLION};
- struct list_head * p;
- struct list_head * h;
-
- while (tw_get_state(tw) == TW_RUNNING) {
- clock_gettime(CLOCK_MONOTONIC, &now);
-
- pthread_mutex_lock(&tw->lock);
-
- if (ts_diff_us(&tw->wheel[tw->pos].expiry, &now) < 0) {
- pthread_mutex_unlock(&tw->lock);
- nanosleep(&tw->intv, NULL);
- continue;
- }
-
- list_for_each_safe(p, h, &tw->wheel[tw->pos].funcs) {
- struct tw_f * f = list_entry(p, struct tw_f, next);
- list_del(&f->next);
- list_add(&f->next, &tw->wq);
- }
-
- ts_add(&tw->wheel[tw->pos].expiry,
- &total,
- &tw->wheel[tw->pos].expiry);
-
- tw->pos = (tw->pos + 1) & (tw->elements - 1);
-
- pthread_cond_signal(&tw->work);
-
- pthread_mutex_unlock(&tw->lock);
- }
-
- return (void *) 0;
-}
-
-struct timerwheel * timerwheel_create(unsigned int resolution,
- unsigned int max_delay)
-{
- struct timespec now = {0, 0};
- struct timespec res_ts = {resolution / 1000,
- (resolution % 1000) * MILLION};
- unsigned long i;
-
- struct timerwheel * tw;
-
- pthread_condattr_t cattr;
-
- assert(resolution != 0);
-
- tw = malloc(sizeof(*tw));
- if (tw == NULL)
- return NULL;
-
- if (pthread_mutex_init(&tw->lock, NULL))
- return NULL;
-
- tw->elements = 1;
-
- while (tw->elements < max_delay / resolution)
- tw->elements <<= 1;
-
- tw->wheel = malloc(sizeof(*tw->wheel) * tw->elements);
- if (tw->wheel == NULL) {
- free(tw);
- return NULL;
- }
-
- tw->resolution = resolution;
-
- tw->intv.tv_sec = (tw->resolution / FRAC) / 1000;
- tw->intv.tv_nsec = ((tw->resolution / FRAC) % 1000) * MILLION;
-
- list_head_init(&tw->wq);
-
- if (pthread_mutex_init(&tw->lock, NULL)) {
- free(tw->wheel);
- free(tw);
- return NULL;
- }
-
- if (pthread_mutex_init(&tw->s_lock, NULL)) {
- pthread_mutex_destroy(&tw->lock);
- free(tw->wheel);
- free(tw);
- return NULL;
- }
-
- if (pthread_condattr_init(&cattr)) {
- pthread_mutex_destroy(&tw->lock);
- free(tw->wheel);
- free(tw);
- return NULL;
- }
-#ifndef __APPLE__
- pthread_condattr_setclock(&cattr, PTHREAD_COND_CLOCK);
-#endif
- if (pthread_cond_init(&tw->work, &cattr)) {
- pthread_mutex_destroy(&tw->s_lock);
- pthread_mutex_destroy(&tw->lock);
- free(tw->wheel);
- free(tw);
- return NULL;
- }
-
- tw->pos = 0;
- tw->state = TW_RUNNING;
-
- clock_gettime(CLOCK_MONOTONIC, &now);
- now.tv_nsec -= (now.tv_nsec % MILLION);
-
- for (i = 0; i < tw->elements; ++i) {
- list_head_init(&tw->wheel[i].funcs);
- tw->wheel[i].expiry = now;
- ts_add(&now, &res_ts, &now);
- }
-
- if (pthread_create(&tw->worker, NULL, worker, (void *) tw)) {
- pthread_cond_destroy(&tw->work);
- pthread_mutex_destroy(&tw->s_lock);
- pthread_mutex_destroy(&tw->lock);
- free(tw->wheel);
- free(tw);
- return NULL;
- }
-
- if (pthread_create(&tw->ticker, NULL, movement, (void *) tw)) {
- tw_set_state(tw, TW_DESTROY);
- pthread_join(tw->worker, NULL);
- pthread_cond_destroy(&tw->work);
- pthread_mutex_destroy(&tw->s_lock);
- pthread_mutex_destroy(&tw->lock);
- free(tw->wheel);
- free(tw);
- return NULL;
- }
-
- return tw;
-}
-
-void timerwheel_destroy(struct timerwheel * tw)
-{
- unsigned long i;
-
- struct list_head * p;
- struct list_head * h;
-
- tw_set_state(tw, TW_DESTROY);
-
- pthread_join(tw->ticker, NULL);
- pthread_join(tw->worker, NULL);
-
- for (i = 0; i < tw->elements; ++i)
- tw_el_fini(&tw->wheel[i]);
-
- pthread_mutex_lock(&tw->lock);
-
- list_for_each_safe(p, h, &tw->wq) {
- struct tw_f * f = list_entry(p, struct tw_f, next);
- list_del(&f->next);
- if (f->arg != NULL)
- free(f->arg);
- free(f);
- }
-
- pthread_mutex_unlock(&tw->lock);
-
- pthread_cond_destroy(&tw->work);
- pthread_mutex_destroy(&tw->lock);
- pthread_mutex_destroy(&tw->s_lock);
-
- free(tw->wheel);
- free(tw);
-}
-
-int timerwheel_add(struct timerwheel * tw,
- void (* func)(void *),
- void * arg,
- size_t arg_len,
- unsigned int delay)
-{
- int pos;
- struct tw_f * f = malloc(sizeof(*f));
- if (f == NULL)
- return -ENOMEM;
-
- f->func = func;
- f->arg = malloc(arg_len);
- if (f->arg == NULL) {
- free(f);
- return -ENOMEM;
- }
-
- memcpy(f->arg, arg, arg_len);
-
- assert(delay < tw->elements * tw->resolution);
-
- pthread_mutex_lock(&tw->lock);
-
- pos = (tw->pos + delay / tw->resolution) & (tw->elements - 1);
- list_add(&f->next, &tw->wheel[pos].funcs);
-
- pthread_mutex_unlock(&tw->lock);
-
- return 0;
-}
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