Merged in sandervrijders/ouroboros/be-frct (pull request #555)

lib: Add basic FRCT mechanisms

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;
-}