add context switch test code

Author: rcitach

examples/utest/testcases/perf/context_switch_tc.c

@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2006-2025, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2025-07-03     rcitach      test case for context_switch
+ */
+
+#include <rtthread.h>
+#include <rthw.h>
+#include <rtdevice.h>
+#include <utest.h>
+#include <utest_assert.h>
+#include <perf_tc.h>
+
+static rt_sem_t sem1, sem2;
+static rt_sem_t complete_sem = RT_NULL;
+
+static void local_modify_time(rt_perf_t *perf)
+{
+    if(perf)
+        perf->real_time = perf->real_time - perf->tmp_time;
+}
+
+static void perf_thread_event1(void *parameter)
+{
+    while (1)
+    {
+        rt_sem_take(sem1, RT_WAITING_FOREVER);
+        rt_sem_release(sem2);
+    }
+}
+
+static void perf_thread_event2(void *parameter)
+{
+    rt_perf_t *perf = (rt_perf_t *)parameter;
+
+    for (rt_uint32_t i = 0; i < UTEST_SYS_PERF_TC_COUNT; i++)
+    {
+        perf->tmp_time = 0;
+        rt_perf_start(perf);
+        rt_sem_take(sem2, RT_WAITING_FOREVER);
+        rt_sem_release(sem2);
+        rt_perf_stop(perf);
+
+        rt_mutex_take(perf->lock,RT_WAITING_FOREVER);
+        perf->count -= 1;
+        perf->tmp_time = perf->real_time;
+        rt_mutex_release(perf->lock);
+
+        rt_perf_start(perf);
+        rt_sem_take(sem2, RT_WAITING_FOREVER);
+        rt_sem_release(sem1);
+        rt_perf_stop(perf);
+    }
+    rt_sem_release(complete_sem);
+}
+
+rt_err_t context_switch_test(rt_perf_t *perf)
+{
+    rt_thread_t thread1 = RT_NULL;
+    rt_thread_t thread2 = RT_NULL;
+
+# if __STDC_VERSION__ >= 199901L
+    rt_strcpy(perf->name,__func__);
+#else
+    rt_strcpy(perf->name,"context_switch_test");
+#endif
+
+    perf->local_modify = local_modify_time;
+    sem1 = rt_sem_create("sem1", 1, RT_IPC_FLAG_FIFO);
+    sem2 = rt_sem_create("sem2", 0, RT_IPC_FLAG_FIFO);
+    complete_sem = rt_sem_create("complete_sem", 0, RT_IPC_FLAG_FIFO);
+
+    thread1 = rt_thread_create("perf_thread_event1", perf_thread_event1, perf,
+                                THREAD_STACK_SIZE, THREAD_PRIORITY, THREAD_TIMESLICE);
+    if (thread1 == RT_NULL)
+    {
+        LOG_E("perf_thread_event1 create failed.");
+        return -RT_ERROR;
+    }
+
+    thread2 = rt_thread_create("perf_thread_event2", perf_thread_event2, perf,
+                                THREAD_STACK_SIZE, THREAD_PRIORITY + 1, THREAD_TIMESLICE);
+    if (thread2 == RT_NULL)
+    {
+        LOG_E("perf_thread_event2 create failed.");
+        return -RT_ERROR;
+    }
+
+    rt_thread_startup(thread1);
+    rt_thread_startup(thread2);
+
+    rt_sem_take(complete_sem, RT_WAITING_FOREVER);
+
+    rt_perf_dump(perf);
+    rt_thread_delete(thread1);
+    rt_sem_delete(complete_sem);
+    rt_sem_delete(sem1);
+    rt_sem_delete(sem2);
+
+    return RT_EOK;
+}
+