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/*
* Ouroboros - Copyright (C) 2016 - 2023
*
* The IPC Resource Manager - Registry - Flows
*
* Dimitri Staessens <dimitri@ouroboros.rocks>
* Sander Vrijders <sander@ouroboros.rocks>
*
* 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 200112L
#include "config.h"
#define OUROBOROS_PREFIX "reg-flow"
#include <ouroboros/errno.h>
#include <ouroboros/logs.h>
#include <ouroboros/time_utils.h>
#include <ouroboros/pthread.h>
#include "flow.h"
#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
struct reg_flow * reg_flow_create(pid_t n_pid,
pid_t n_1_pid,
int flow_id,
qosspec_t qs)
{
pthread_condattr_t cattr;
struct reg_flow * f;
f = malloc(sizeof(*f));
if (f == NULL)
goto fail_malloc;
memset(f, 0, sizeof(*f));
if (pthread_condattr_init(&cattr))
goto fail_cattr;
#ifndef __APPLE__
pthread_condattr_setclock(&cattr, PTHREAD_COND_CLOCK);
#endif
if (pthread_cond_init(&f->cond, &cattr))
goto fail_cond;
if (pthread_mutex_init(&f->mtx, NULL))
goto fail_mutex;
f->n_rb = shm_rbuff_create(n_pid, flow_id);
if (f->n_rb == NULL) {
log_err("Could not create ringbuffer for process %d.", n_pid);
goto fail_n_rbuff;
}
f->n_1_rb = shm_rbuff_create(n_1_pid, flow_id);
if (f->n_1_rb == NULL) {
log_err("Could not create ringbuffer for process %d.", n_1_pid);
goto fail_n_1_rbuff;
}
if (clock_gettime(CLOCK_MONOTONIC, &f->t0) < 0)
log_warn("Failed to set timestamp.");
pthread_condattr_destroy(&cattr);
f->n_pid = n_pid;
f->n_1_pid = n_1_pid;
f->flow_id = flow_id;
f->qs = qs;
f->state = FLOW_ALLOC_PENDING;
return f;
fail_n_1_rbuff:
shm_rbuff_destroy(f->n_rb);
fail_n_rbuff:
pthread_mutex_destroy(&f->mtx);
fail_mutex:
pthread_cond_destroy(&f->cond);
fail_cond:
pthread_condattr_destroy(&cattr);
fail_cattr:
free(f);
fail_malloc:
return NULL;
}
static void cancel_irm_destroy(void * o)
{
struct reg_flow * f = (struct reg_flow *) o;
pthread_mutex_unlock(&f->mtx);
pthread_cond_destroy(&f->cond);
pthread_mutex_destroy(&f->mtx);
shm_rbuff_destroy(f->n_rb);
shm_rbuff_destroy(f->n_1_rb);
free(f);
}
void reg_flow_destroy(struct reg_flow * f)
{
assert(f);
pthread_mutex_lock(&f->mtx);
assert(f->data.len == 0);
if (f->state == FLOW_DESTROY) {
pthread_mutex_unlock(&f->mtx);
return;
}
if (f->state == FLOW_ALLOC_PENDING)
f->state = FLOW_DESTROY;
else
f->state = FLOW_NULL;
pthread_cond_broadcast(&f->cond);
pthread_cleanup_push(cancel_irm_destroy, f);
while (f->state != FLOW_NULL)
pthread_cond_wait(&f->cond, &f->mtx);
pthread_cleanup_pop(true);
}
enum flow_state reg_flow_get_state(struct reg_flow * f)
{
enum flow_state state;
assert(f);
pthread_mutex_lock(&f->mtx);
state = f->state;
pthread_mutex_unlock(&f->mtx);
return state;
}
void reg_flow_set_state(struct reg_flow * f,
enum flow_state state)
{
assert(f);
assert(state != FLOW_DESTROY);
pthread_mutex_lock(&f->mtx);
f->state = state;
pthread_cond_broadcast(&f->cond);
pthread_mutex_unlock(&f->mtx);
}
int reg_flow_wait_state(struct reg_flow * f,
enum flow_state state,
struct timespec * dl)
{
int ret = 0;
int s;
assert(f);
assert(state != FLOW_NULL);
assert(state != FLOW_DESTROY);
assert(state != FLOW_DEALLOC_PENDING);
pthread_mutex_lock(&f->mtx);
assert(f->state != FLOW_NULL);
pthread_cleanup_push(__cleanup_mutex_unlock, &f->mtx);
while (!(f->state == state ||
f->state == FLOW_DESTROY ||
f->state == FLOW_DEALLOC_PENDING) &&
ret != -ETIMEDOUT) {
if (dl != NULL)
ret = -pthread_cond_timedwait(&f->cond,
&f->mtx,
dl);
else
ret = -pthread_cond_wait(&f->cond,
&f->mtx);
}
if (f->state == FLOW_DESTROY ||
f->state == FLOW_DEALLOC_PENDING ||
ret == -ETIMEDOUT) {
f->state = FLOW_NULL;
pthread_cond_broadcast(&f->cond);
}
s = f->state;
pthread_cleanup_pop(true);
return ret ? ret : s;
}
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