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/*
* Copyright (c) 2006-2025, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-12-25 Shell the first version
* 2025-11-16 h0bbl3s Add standardized utest documentation block
*/
/**
* Test Case Name: Kernel Core MT-Safe Kprint Test
*
* Test Objectives:
* - Validate the thread-safety of the rt_kprintf function
*
* Test Scenarios:
* - mtsafe_kprint_tc: Creates 16 concurrent threads, each calling rt_kprintf in a loop to stress test for
* race conditions and corruptions
*
* Verification Metrics:
* - All 16 threads run to completion (verified by semaphore)
* - The system does not crash or deadlock
* - Console output is not garbled or corrupted
*
* Dependencies:
* - Enable MT-Safe kprint Test (RT-Thread Utestcases -> Kernel Core -> MT-Safe Kprint Test)
* - RT_USING_THREADSAFE_PRINTF must be enabled (RT-Thread Kernel -> Enable thread safe kernel print service)
* - Note: This test (and MT-safe kprint) increases scheduler load. The idle thread stack
* size (RT-Thread Kernel -> The stack size of idle thread) may need to be increased for this test
* - Test on any RT-Thread supported platform
*
* Expected Results:
* - After executing this test in msh each thread prints its id on a single line each loop until it is finished
* - There should be no mixed or overlapping console outputs
* - When complete you should see the output:
* "[ PASSED ] [ result ] testcase (core.mtsafe_kprint)"
*/
#include <rtthread.h>
#include "utest.h"
#define TEST_LOOP_TIMES 20
static struct rt_semaphore _thr_exit_sem;
static void _thread_entry(void *param)
{
for (size_t i = 0; i < TEST_LOOP_TIMES; i++)
{
rt_kprintf("This is thread %p\n", rt_thread_self());
rt_thread_mdelay(1);
}
rt_sem_release(&_thr_exit_sem);
return;
}
#define TEST_THREAD_COUNT 16
static void mtsafe_kprint_tc(void)
{
for (size_t i = 0; i < TEST_THREAD_COUNT; i++)
{
rt_thread_t new_thread =
rt_thread_create(
"test",
_thread_entry,
NULL,
UTEST_THR_STACK_SIZE,
UTEST_THR_PRIORITY,
100);
rt_thread_startup(new_thread);
}
for (size_t i = 0; i < TEST_THREAD_COUNT; i++)
{
rt_sem_take(&_thr_exit_sem, RT_WAITING_FOREVER);
}
}
static rt_err_t utest_tc_init(void)
{
rt_sem_init(&_thr_exit_sem, "test", 0, RT_IPC_FLAG_PRIO);
return RT_EOK;
}
static rt_err_t utest_tc_cleanup(void)
{
rt_sem_detach(&_thr_exit_sem);
return RT_EOK;
}
static void testcase(void)
{
UTEST_UNIT_RUN(mtsafe_kprint_tc);
}
UTEST_TC_EXPORT(testcase, "core.mtsafe_kprint", utest_tc_init, utest_tc_cleanup, 10);
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