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/*
* Copyright 2010-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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 <aws/common/rw_lock.h>
#include <aws/common/thread.h>
#include <aws/testing/aws_test_harness.h>
static int s_test_rw_lock_acquire_release(struct aws_allocator *allocator, void *ctx) {
(void)allocator;
(void)ctx;
struct aws_rw_lock rw_lock;
aws_rw_lock_init(&rw_lock);
ASSERT_SUCCESS(aws_rw_lock_wlock(&rw_lock), "rw_lock acquire should have returned success.");
ASSERT_SUCCESS(aws_rw_lock_wunlock(&rw_lock), "rw_lock release should have returned success.");
ASSERT_SUCCESS(aws_rw_lock_rlock(&rw_lock), "rw_lock acquire should have returned success.");
ASSERT_SUCCESS(aws_rw_lock_runlock(&rw_lock), "rw_lock release should have returned success.");
aws_rw_lock_clean_up(&rw_lock);
return 0;
}
AWS_TEST_CASE(rw_lock_aquire_release_test, s_test_rw_lock_acquire_release)
struct thread_rw_lock_data {
struct aws_rw_lock rw_lock;
volatile int counter;
int max_counts;
volatile int thread_fn_increments;
};
static void s_rw_lock_thread_fn(void *rw_lock_data) {
struct thread_rw_lock_data *p_rw_lock = (struct thread_rw_lock_data *)rw_lock_data;
int finished = 0;
while (!finished) {
aws_rw_lock_rlock(&p_rw_lock->rw_lock);
if (p_rw_lock->counter != p_rw_lock->max_counts) {
int counter = p_rw_lock->counter + 1;
aws_rw_lock_runlock(&p_rw_lock->rw_lock);
aws_rw_lock_wlock(&p_rw_lock->rw_lock);
p_rw_lock->counter = counter;
p_rw_lock->thread_fn_increments += 1;
aws_rw_lock_wunlock(&p_rw_lock->rw_lock);
aws_rw_lock_rlock(&p_rw_lock->rw_lock);
finished = p_rw_lock->counter == p_rw_lock->max_counts;
} else {
finished = 1;
}
aws_rw_lock_runlock(&p_rw_lock->rw_lock);
}
}
static int s_test_rw_lock_is_actually_rw_lock(struct aws_allocator *allocator, void *ctx) {
(void)ctx;
struct thread_rw_lock_data rw_lock_data = {
.counter = 0,
.max_counts = 1000000,
.thread_fn_increments = 0,
};
aws_rw_lock_init(&rw_lock_data.rw_lock);
struct aws_thread thread;
aws_thread_init(&thread, allocator);
ASSERT_SUCCESS(
aws_thread_launch(&thread, s_rw_lock_thread_fn, &rw_lock_data, 0),
"thread creation failed with error %d",
aws_last_error());
int finished = 0;
while (!finished) {
aws_rw_lock_rlock(&rw_lock_data.rw_lock);
finished = rw_lock_data.counter == rw_lock_data.max_counts;
aws_rw_lock_runlock(&rw_lock_data.rw_lock);
}
ASSERT_SUCCESS(aws_thread_join(&thread), "Thread join failed with error code %d.", aws_last_error());
ASSERT_INT_EQUALS(
rw_lock_data.thread_fn_increments, rw_lock_data.max_counts, "Thread 2 should have written all data");
ASSERT_INT_EQUALS(
rw_lock_data.max_counts, rw_lock_data.counter, "Both threads should have written exactly the max counts.");
aws_thread_clean_up(&thread);
aws_rw_lock_clean_up(&rw_lock_data.rw_lock);
return 0;
}
AWS_TEST_CASE(rw_lock_is_actually_rw_lock_test, s_test_rw_lock_is_actually_rw_lock)
static int s_iterations = 0;
static void s_thread_reader_fn(void *ud) {
struct aws_rw_lock *lock = ud;
int finished = 0;
while (!finished) {
aws_rw_lock_rlock(lock);
finished = s_iterations == 10000;
aws_rw_lock_runlock(lock);
}
}
static int s_test_rw_lock_many_readers(struct aws_allocator *allocator, void *ctx) {
(void)ctx;
struct aws_rw_lock lock;
aws_rw_lock_init(&lock);
struct aws_thread threads[2];
AWS_ZERO_ARRAY(threads);
for (size_t i = 0; i < AWS_ARRAY_SIZE(threads); ++i) {
aws_thread_init(&threads[i], allocator);
ASSERT_SUCCESS(
aws_thread_launch(&threads[i], s_thread_reader_fn, &lock, 0),
"thread creation failed with error %d",
aws_last_error());
}
int finished = 0;
while (!finished) {
aws_rw_lock_wlock(&lock);
finished = ++s_iterations == 10000;
aws_rw_lock_wunlock(&lock);
}
for (size_t i = 0; i < AWS_ARRAY_SIZE(threads); ++i) {
ASSERT_SUCCESS(aws_thread_join(&threads[i]), "Thread join failed with error code %d.", aws_last_error());
aws_thread_clean_up(&threads[i]);
}
aws_rw_lock_clean_up(&lock);
return 0;
}
AWS_TEST_CASE(rw_lock_many_readers_test, s_test_rw_lock_many_readers)
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