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/*
* Ouroboros - Copyright (C) 2016 - 2018
*
* The IPC Resource Manager - Flows
*
* 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 200112L
#include "config.h"
#define OUROBOROS_PREFIX "irm_flow"
#include <ouroboros/errno.h>
#include <ouroboros/logs.h>
#include <ouroboros/time_utils.h>
#include "irm_flow.h"
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
struct irm_flow * irm_flow_create(pid_t n_pid,
pid_t n_1_pid,
int flow_id,
qosspec_t qs)
{
pthread_condattr_t cattr;
struct irm_flow * f = malloc(sizeof(*f));
if (f == NULL)
goto fail_malloc;
if (pthread_condattr_init(&cattr))
goto fail_cattr;
#ifndef __APPLE__
pthread_condattr_setclock(&cattr, PTHREAD_COND_CLOCK);
#endif
if (pthread_cond_init(&f->state_cond, &cattr))
goto fail_state_cond;
if (pthread_mutex_init(&f->state_lock, NULL))
goto fail_mutex;
f->n_pid = n_pid;
f->n_1_pid = n_1_pid;
f->flow_id = flow_id;
f->qs = qs;
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;
}
f->state = FLOW_ALLOC_PENDING;
if (clock_gettime(CLOCK_MONOTONIC, &f->t0) < 0)
log_warn("Failed to set timestamp.");
pthread_condattr_destroy(&cattr);
return f;
fail_n_1_rbuff:
shm_rbuff_destroy(f->n_rb);
fail_n_rbuff:
pthread_mutex_destroy(&f->state_lock);
fail_mutex:
pthread_cond_destroy(&f->state_cond);
fail_state_cond:
pthread_condattr_destroy(&cattr);
fail_cattr:
free(f);
fail_malloc:
return NULL;
}
static void cancel_irm_destroy(void * o)
{
struct irm_flow * f = (struct irm_flow *) o;
pthread_mutex_unlock(&f->state_lock);
pthread_cond_destroy(&f->state_cond);
pthread_mutex_destroy(&f->state_lock);
shm_rbuff_destroy(f->n_rb);
shm_rbuff_destroy(f->n_1_rb);
free(f);
}
void irm_flow_destroy(struct irm_flow * f)
{
assert(f);
pthread_mutex_lock(&f->state_lock);
if (f->state == FLOW_DESTROY) {
pthread_mutex_unlock(&f->state_lock);
return;
}
if (f->state == FLOW_ALLOC_PENDING)
f->state = FLOW_DESTROY;
else
f->state = FLOW_NULL;
pthread_cond_signal(&f->state_cond);
pthread_cleanup_push(cancel_irm_destroy, f);
while (f->state != FLOW_NULL)
pthread_cond_wait(&f->state_cond, &f->state_lock);
pthread_cleanup_pop(true);
}
enum flow_state irm_flow_get_state(struct irm_flow * f)
{
enum flow_state state;
assert(f);
pthread_mutex_lock(&f->state_lock);
state = f->state;
pthread_mutex_unlock(&f->state_lock);
return state;
}
void irm_flow_set_state(struct irm_flow * f,
enum flow_state state)
{
assert(f);
assert(state != FLOW_DESTROY);
pthread_mutex_lock(&f->state_lock);
f->state = state;
pthread_cond_broadcast(&f->state_cond);
pthread_mutex_unlock(&f->state_lock);
}
int irm_flow_wait_state(struct irm_flow * f,
enum flow_state state,
struct timespec * timeo)
{
int ret = 0;
int s;
struct timespec dl;
assert(f);
assert(state != FLOW_NULL);
assert(state != FLOW_DESTROY);
assert(state != FLOW_DEALLOC_PENDING);
if (timeo != NULL) {
clock_gettime(PTHREAD_COND_CLOCK, &dl);
ts_add(&dl, timeo, &dl);
}
pthread_mutex_lock(&f->state_lock);
assert(f->state != FLOW_NULL);
pthread_cleanup_push((void *)(void *) pthread_mutex_unlock,
&f->state_lock);
while (!(f->state == state ||
f->state == FLOW_DESTROY ||
f->state == FLOW_DEALLOC_PENDING) &&
ret != -ETIMEDOUT) {
if (timeo == NULL)
ret = -pthread_cond_wait(&f->state_cond,
&f->state_lock);
else
ret = -pthread_cond_timedwait(&f->state_cond,
&f->state_lock,
&dl);
}
if (f->state == FLOW_DESTROY ||
f->state == FLOW_DEALLOC_PENDING ||
ret == -ETIMEDOUT) {
f->state = FLOW_NULL;
pthread_cond_broadcast(&f->state_cond);
}
s = f->state;
pthread_cleanup_pop(true);
return ret ? ret : s;
}
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