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/*
* Copyright (c) 2023 Red Hat, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#undef NDEBUG
#include <unistd.h>
#include "openvswitch/list.h"
#include "ovstest.h"
#include "ovs-thread.h"
#include "random.h"
#include "rculist.h"
#include "util.h"
enum { MAX_ELEMS = 10, MAX_CHECKS = 200 };
/* Sample list element. */
struct element {
int value;
struct rculist node;
};
static void
do_usleep(unsigned int usecs)
{
#ifdef _WIN32
Sleep(MAX(usecs / 1000, 1));
#else
usleep(usecs);
#endif
}
/* Continuously check the integrity of the list until it's empty. */
static void *
checker_main(void *aux)
{
struct rculist *list = (struct rculist *) aux;
struct element *elem;
bool checked = false;
for (int i = 0; i < MAX_CHECKS; i++) {
int value = -1;
RCULIST_FOR_EACH (elem, node, list) {
ovs_assert(value <= elem->value);
ovs_assert(elem->value < MAX_ELEMS);
value = elem->value;
if (!checked) {
checked = true;
}
do_usleep(10);
}
ovsrcu_quiesce();
if (checked && rculist_is_empty(list)) {
break;
}
}
return NULL;
}
/* Run test while a thread checks the integrity of the list.
* Tests must end up emptying the list. */
static void
run_test_while_checking(void (*function)(struct rculist *list))
{
struct rculist list;
pthread_t checker;
rculist_init(&list);
checker = ovs_thread_create("checker", checker_main, &list);
function(&list);
ovs_assert(rculist_is_empty(&list));
ovsrcu_quiesce();
xpthread_join(checker, NULL);
printf(".");
}
static void
test_rculist_insert_delete__(struct rculist *list, bool long_version)
{
struct element *elem;
int value;
for (int i = 1; i < MAX_ELEMS; i++) {
elem = xmalloc(sizeof *elem);
elem->value = i;
rculist_insert(list, &elem->node);
/* Leave some time for checkers to iterate through. */
do_usleep(random_range(1000));
}
ovsrcu_quiesce();
value = MAX_ELEMS;
RCULIST_FOR_EACH_REVERSE_PROTECTED (elem, node, list) {
ovs_assert (elem->value <= value);
value = elem->value;
}
if (long_version) {
struct element *next;
RCULIST_FOR_EACH_SAFE_PROTECTED (elem, next, node, list) {
rculist_remove(&elem->node);
ovsrcu_postpone(free, elem);
/* Leave some time for checkers to iterate through. */
do_usleep(random_range(1000));
}
} else {
RCULIST_FOR_EACH_SAFE_PROTECTED (elem, node, list) {
rculist_remove(&elem->node);
ovsrcu_postpone(free, elem);
/* Leave some time for checkers to iterate through. */
do_usleep(random_range(1000));
}
}
}
static void
test_rculist_insert_delete(struct rculist *list)
{
test_rculist_insert_delete__(list, false);
}
static void
test_rculist_insert_delete_long(struct rculist *list)
{
test_rculist_insert_delete__(list, true);
}
static void
test_rculist_push_front_pop_back(struct rculist *list)
{
struct element *elem;
for (int i = MAX_ELEMS - 1; i > 0; i--) {
elem = xmalloc(sizeof *elem);
elem->value = i;
rculist_push_front(list, &elem->node);
/* Leave some time for checkers to iterate through. */
do_usleep(random_range(1000));
}
ovsrcu_quiesce();
while (!rculist_is_empty(list)) {
elem = CONTAINER_OF(rculist_pop_back(list), struct element, node);
ovsrcu_postpone(free, elem);
/* Leave some time for checkers to iterate through. */
do_usleep(random_range(1000));
}
}
static void
test_rculist_push_back_pop_front(struct rculist *list)
{
struct element *elem;
for (int i = 0; i < MAX_ELEMS; i++) {
elem = xmalloc(sizeof *elem);
elem->value = i;
rculist_push_back(list, &elem->node);
/* Leave some time for checkers to iterate through. */
do_usleep(random_range(1000));
}
ovsrcu_quiesce();
while (!rculist_is_empty(list)) {
elem = CONTAINER_OF(rculist_pop_front(list), struct element, node);
ovsrcu_postpone(free, elem);
/* Leave some time for checkers to iterate through. */
do_usleep(random_range(1000));
}
}
static void
test_rculist_splice(struct rculist *list)
{
struct element *elem;
struct rculist other;
rculist_init(&other);
/* Insert elements in list by splicing an intermediate rculist. */
for (int i = 0; i < MAX_ELEMS; i++) {
elem = xmalloc(sizeof *elem);
elem->value = i;
rculist_insert(&other, &elem->node);
rculist_splice_hidden(list, rculist_next_protected(&other), &other);
rculist_init(&other);
/* Leave some time for checkers to iterate through. */
do_usleep(random_range(1000));
}
ovsrcu_quiesce();
ovs_assert(rculist_size(list) == MAX_ELEMS);
ovs_assert(rculist_is_empty(&other));
while (!rculist_is_empty(list)) {
elem = CONTAINER_OF(rculist_pop_front(list), struct element, node);
ovsrcu_postpone(free, elem);
/* Leave some time for checkers to iterate through. */
do_usleep(random_range(1000));
}
}
static void
test_rculist_main(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
{
run_test_while_checking(test_rculist_insert_delete);
run_test_while_checking(test_rculist_insert_delete_long);
run_test_while_checking(test_rculist_push_back_pop_front);
run_test_while_checking(test_rculist_push_front_pop_back);
run_test_while_checking(test_rculist_splice);
printf("\n");
}
OVSTEST_REGISTER("test-rculist", test_rculist_main);
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