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/*
* Ouroboros - Copyright (C) 2016 - 2017
*
* CDAP - CDAP request management
*
* Dimitri Staessens <dimitri.staessens@ugent.be>
* Sander Vrijders <sander.vrijders@ugent.be>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#define _POSIX_C_SOURCE 200809L
#include "config.h"
#include <ouroboros/time_utils.h>
#include <ouroboros/errno.h>
#include "cdap_req.h"
#include <stdlib.h>
#include <assert.h>
struct cdap_req * cdap_req_create(int fd,
invoke_id_t iid,
cdap_key_t key)
{
struct cdap_req * creq = malloc(sizeof(*creq));
pthread_condattr_t cattr;
if (creq == NULL)
return NULL;
creq->fd = fd;
creq->iid = iid;
creq->key = key;
creq->state = REQ_INIT;
creq->response = -1;
creq->data.data = NULL;
creq->data.len = 0;
if (pthread_mutex_init(&creq->lock, NULL)) {
free(creq);
return NULL;
}
pthread_condattr_init(&cattr);
#ifndef __APPLE__
pthread_condattr_setclock(&cattr, PTHREAD_COND_CLOCK);
#endif
if (pthread_cond_init(&creq->cond, &cattr)) {
pthread_condattr_destroy(&cattr);
pthread_mutex_destroy(&creq->lock);
free(creq);
return NULL;
}
pthread_condattr_destroy(&cattr);
list_head_init(&creq->next);
clock_gettime(PTHREAD_COND_CLOCK, &creq->birth);
return creq;
}
void cdap_req_destroy(struct cdap_req * creq)
{
assert(creq);
pthread_mutex_lock(&creq->lock);
switch(creq->state) {
case REQ_DESTROY:
pthread_mutex_unlock(&creq->lock);
return;
case REQ_INIT:
creq->state = REQ_NULL;
pthread_cond_broadcast(&creq->cond);
break;
case REQ_INIT_PENDING:
case REQ_PENDING:
case REQ_RESPONSE:
creq->state = REQ_DESTROY;
pthread_cond_broadcast(&creq->cond);
break;
default:
break;
}
while (creq->state != REQ_NULL)
pthread_cond_wait(&creq->cond, &creq->lock);
pthread_mutex_unlock(&creq->lock);
pthread_cond_destroy(&creq->cond);
pthread_mutex_destroy(&creq->lock);
free(creq);
}
int cdap_req_wait(struct cdap_req * creq)
{
struct timespec timeout = {(CDAP_REPLY_TIMEOUT / 1000),
(CDAP_REPLY_TIMEOUT % 1000) * MILLION};
struct timespec abstime;
int ret = -1;
assert(creq);
ts_add(&creq->birth, &timeout, &abstime);
pthread_mutex_lock(&creq->lock);
if (creq->state != REQ_INIT) {
pthread_mutex_unlock(&creq->lock);
return -EINVAL;
}
creq->state = REQ_PENDING;
pthread_cond_broadcast(&creq->cond);
while (creq->state == REQ_PENDING && ret != -ETIMEDOUT)
ret = -pthread_cond_timedwait(&creq->cond,
&creq->lock,
&abstime);
switch(creq->state) {
case REQ_DESTROY:
ret = -1;
/* FALLTHRU */
case REQ_PENDING:
creq->state = REQ_NULL;
pthread_cond_broadcast(&creq->cond);
break;
case REQ_RESPONSE:
creq->state = REQ_DONE;
pthread_cond_broadcast(&creq->cond);
break;
default:
assert(false);
break;
}
pthread_mutex_unlock(&creq->lock);
return ret;
}
void cdap_req_respond(struct cdap_req * creq,
int response,
buffer_t data)
{
assert(creq);
pthread_mutex_lock(&creq->lock);
if (creq->state == REQ_INIT)
creq->state = REQ_INIT_PENDING;
while (creq->state == REQ_INIT_PENDING)
pthread_cond_wait(&creq->cond, &creq->lock);
if (creq->state != REQ_PENDING) {
creq->state = REQ_NULL;
pthread_cond_broadcast(&creq->cond);
pthread_mutex_unlock(&creq->lock);
return;
}
creq->state = REQ_RESPONSE;
creq->response = response;
creq->data = data;
pthread_cond_broadcast(&creq->cond);
while (creq->state == REQ_RESPONSE)
pthread_cond_wait(&creq->cond, &creq->lock);
creq->state = REQ_NULL;
pthread_cond_broadcast(&creq->cond);
pthread_mutex_unlock(&creq->lock);
}
void cdap_req_cancel(struct cdap_req * creq)
{
assert(creq);
pthread_mutex_lock(&creq->lock);
creq->state = REQ_NULL;
pthread_cond_broadcast(&creq->cond);
pthread_mutex_unlock(&creq->lock);
}
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