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/*
* Copyright (C) 2014 René Kijewski <rene.kijewski@fu-berlin.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "thread.h"
#include "kernel.h"
#include "ringbuffer.h"
#include "mutex.h"
#include "tests-core.h"
/* (ITERATIONS * (BUF_SIZE + 1)) needs to be <= 127! Otherwise `char` overflows. */
#define ITERATIONS 15
#define BUF_SIZE 7
static char stack_get[THREAD_STACKSIZE_DEFAULT];
static char rb_buf[BUF_SIZE];
static ringbuffer_t rb = RINGBUFFER_INIT(rb_buf);
static mutex_t mutex;
static kernel_pid_t pid_add, pid_get;
static void assert_avail(unsigned assumed)
{
TEST_ASSERT_EQUAL_INT(assumed, rb.avail);
}
static void assert_add_one(char to_add, int assumed_result)
{
int actual_result = ringbuffer_add_one(&rb, to_add);
TEST_ASSERT_EQUAL_INT(assumed_result, actual_result);
}
static void assert_get_one(int assumed_result)
{
int actual_result = ringbuffer_get_one(&rb);
TEST_ASSERT_EQUAL_INT(assumed_result, actual_result);
}
static void run_add(void)
{
char next = 0;
for (unsigned iteration = 0; iteration < ITERATIONS; ++iteration) {
mutex_lock(&mutex);
for (unsigned i = 0; i < BUF_SIZE; ++i) {
assert_avail(i);
assert_add_one(next, -1);
assert_avail(i + 1);
++next;
}
/* Overwrite oldest element. It should be returned to us. */
assert_avail(BUF_SIZE);
assert_add_one(next, next - BUF_SIZE);
assert_avail(BUF_SIZE);
++next;
thread_wakeup(pid_get);
mutex_unlock_and_sleep(&mutex);
}
thread_wakeup(pid_get);
}
static void *run_get(void *arg)
{
(void) arg;
char next = 0;
for (unsigned iteration = 0; iteration < ITERATIONS; ++iteration) {
++next; /* the first element of a stride is always overwritten */
mutex_lock(&mutex);
for (unsigned i = BUF_SIZE; i > 0; --i) {
assert_avail(i);
assert_get_one(next);
assert_avail(i - 1);
++next;
}
assert_avail(0);
assert_get_one(-1);
assert_avail(0);
thread_wakeup(pid_add);
mutex_unlock_and_sleep(&mutex);
}
return NULL;
}
static void tests_core_ringbuffer(void)
{
pid_add = sched_active_pid;
pid_get = thread_create(stack_get, sizeof (stack_get),
THREAD_PRIORITY_MAIN,
THREAD_CREATE_SLEEPING | THREAD_CREATE_STACKTEST,
run_get, NULL, "get");
run_add();
}
Test *tests_core_ringbuffer_tests(void)
{
EMB_UNIT_TESTFIXTURES(fixtures) {
new_TestFixture(tests_core_ringbuffer),
};
EMB_UNIT_TESTCALLER(ringbuffer_tests, NULL, NULL, fixtures);
return (Test *)&ringbuffer_tests;
}