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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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define OUROBOROS_PREFIX "sdu-scheduler"
#include <ouroboros/config.h>
#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 {
flow_set_t * set[QOS_CUBE_MAX];
fqueue_t * fqs[QOS_CUBE_MAX];
next_sdu_t callback;
pthread_t sdu_reader;
};
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;
sched = (struct sdu_sched *) o;
while (true) {
/* FIXME: replace with scheduling policy call */
i = (i + 1) % QOS_CUBE_MAX;
ret = flow_event_wait(sched->set[i], sched->fqs[i], &timeout);
if (ret == -ETIMEDOUT)
continue;
if (ret < 0) {
log_warn("Event error: %d.", ret);
continue;
}
while ((fd = fqueue_next(sched->fqs[i])) >= 0) {
if (ipcp_flow_read(fd, &sdb)) {
log_warn("Failed to read SDU from fd %d.", fd);
continue;
}
if (sched->callback(fd, i, sdb)) {
log_warn("Callback reported an error.");
continue;
}
}
}
return (void *) 0;
}
struct sdu_sched * sdu_sched_create(flow_set_t * set[QOS_CUBE_MAX],
next_sdu_t callback)
{
struct sdu_sched * sdu_sched;
int i;
int j;
sdu_sched = malloc(sizeof(*sdu_sched));
if (sdu_sched == NULL)
return NULL;
sdu_sched->callback = callback;
for (i = 0; i < QOS_CUBE_MAX; ++i) {
sdu_sched->set[i] = set[i];
sdu_sched->fqs[i] = fqueue_create();
if (sdu_sched->fqs[i] == NULL) {
for (j = i; j >= 0; --j)
fqueue_destroy(sdu_sched->fqs[j]);
free(sdu_sched);
return NULL;
}
}
pthread_create(&sdu_sched->sdu_reader,
NULL,
sdu_reader,
(void *) sdu_sched);
return sdu_sched;
}
void sdu_sched_destroy(struct sdu_sched * sdu_sched)
{
int i;
assert(sdu_sched);
pthread_cancel(sdu_sched->sdu_reader);
pthread_join(sdu_sched->sdu_reader, NULL);
for (i = 0; i < QOS_CUBE_MAX; ++i)
fqueue_destroy(sdu_sched->fqs[i]);
free(sdu_sched);
}
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