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/*
* Ouroboros - Copyright (C) 2016 - 2017
*
* SDU scheduler component
*
* 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/.
*/
#define _POSIX_C_SOURCE 199309L
#include "config.h"
#define OUROBOROS_PREFIX "sdu-scheduler"
#include <ouroboros/logs.h>
#include <ouroboros/errno.h>
#include "sdu_sched.h"
#include <stdbool.h>
#include <assert.h>
#include <stdlib.h>
#define FD_UPDATE_TIMEOUT 10000 /* nanoseconds */
struct sdu_sched {
fset_t * set[QOS_CUBE_MAX];
next_sdu_fn_t callback;
pthread_t sdu_readers[IPCP_SCHED_THREADS];
};
static void cleanup_reader(void * o)
{
int i;
fqueue_t ** fqs = (fqueue_t **) o;
for (i = 0; i < QOS_CUBE_MAX; ++i)
fqueue_destroy(fqs[i]);
}
static void * sdu_reader(void * o)
{
struct sdu_sched * sched;
struct shm_du_buff * sdb;
struct timespec timeout = {0, FD_UPDATE_TIMEOUT};
int fd;
int i = 0;
int ret;
fqueue_t * fqs[QOS_CUBE_MAX];
sched = (struct sdu_sched *) o;
for (i = 0; i < QOS_CUBE_MAX; ++i) {
fqs[i] = fqueue_create();
if (fqs[i] == NULL) {
int j;
for (j = 0; j < i; ++j)
fqueue_destroy(fqs[j]);
return (void *) -1;
}
}
pthread_cleanup_push(cleanup_reader, fqs);
while (true) {
/* FIXME: replace with scheduling policy call */
i = (i + 1) % QOS_CUBE_MAX;
ret = fevent(sched->set[i], fqs[i], &timeout);
if (ret == -ETIMEDOUT)
continue;
if (ret < 0) {
log_warn("Event error: %d.", ret);
continue;
}
while ((fd = fqueue_next(fqs[i])) >= 0) {
if (ipcp_flow_read(fd, &sdb)) {
log_warn("Failed to read SDU from fd %d.", fd);
continue;
}
sched->callback(fd, i, sdb);
}
}
pthread_cleanup_pop(true);
return (void *) 0;
}
struct sdu_sched * sdu_sched_create(next_sdu_fn_t callback)
{
struct sdu_sched * sdu_sched;
int i;
int j;
sdu_sched = malloc(sizeof(*sdu_sched));
if (sdu_sched == NULL)
goto fail_malloc;
assert(callback);
sdu_sched->callback = callback;
for (i = 0; i < QOS_CUBE_MAX; ++i) {
sdu_sched->set[i] = fset_create();
if (sdu_sched->set[i] == NULL) {
for (j = 0; j < i; ++j)
fset_destroy(sdu_sched->set[j]);
goto fail_flow_set;
}
}
for (i = 0; i < IPCP_SCHED_THREADS; ++i) {
if (pthread_create(&sdu_sched->sdu_readers[i], NULL,
sdu_reader, sdu_sched)) {
int j;
for (j = 0; j < i; ++j) {
pthread_cancel(sdu_sched->sdu_readers[j]);
pthread_join(sdu_sched->sdu_readers[j], NULL);
}
goto fail_flow_set;
}
}
return sdu_sched;
fail_flow_set:
free(sdu_sched);
fail_malloc:
return NULL;
}
void sdu_sched_destroy(struct sdu_sched * sdu_sched)
{
int i;
assert(sdu_sched);
for (i = 0; i < IPCP_SCHED_THREADS; ++i) {
pthread_cancel(sdu_sched->sdu_readers[i]);
pthread_join(sdu_sched->sdu_readers[i], NULL);
}
for (i = 0; i < QOS_CUBE_MAX; ++i)
fset_destroy(sdu_sched->set[i]);
free(sdu_sched);
}
void sdu_sched_add(struct sdu_sched * sdu_sched,
int fd)
{
qoscube_t qc;
assert(sdu_sched);
ipcp_flow_get_qoscube(fd, &qc);
fset_add(sdu_sched->set[qc], fd);
}
void sdu_sched_del(struct sdu_sched * sdu_sched,
int fd)
{
qoscube_t qc;
assert(sdu_sched);
ipcp_flow_get_qoscube(fd, &qc);
fset_del(sdu_sched->set[qc], fd);
}
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