[kservice] MT-safe output support (kprintf/kputs)

Signed-off-by: Shell <smokewood@qq.com>

examples/utest/testcases/kernel/Kconfig

@@ -65,4 +65,8 @@ config UTEST_HOOKLIST_TC
     select RT_USING_HOOKLIST
     default n
 
+config UTEST_MTSAFE_KPRINT_TC
+    bool "mtsafe kprint test"
+    default n
+
 endmenu

examples/utest/testcases/kernel/SConscript

@@ -47,6 +47,9 @@ if GetDepend(['UTEST_ATOMIC_TC']):
 if GetDepend(['UTEST_HOOKLIST_TC']):
     src += ['hooklist_tc.c']
 
+if GetDepend(['UTEST_MTSAFE_KPRINT_TC']):
+    src += ['mtsafe_kprint_tc.c']
+
 group = DefineGroup('utestcases', src, depend = ['RT_USING_UTESTCASES'], CPPPATH = CPPPATH)
 
 Return('group')

examples/utest/testcases/kernel/mtsafe_kprint_tc.c

@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2023-12-25     Shell        the first version
+ */
+#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, "testcases.kernel.mtsafe_kprint", utest_tc_init, utest_tc_cleanup, 10);