[ipc] support of lockless rt_completion (#8887)

* [ipc] lockless rt_completion implementation

The new rt_completion implemented by lockless algorithm can improve timer resolution for up to ~12%, compare to sem IPC.

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

* fixup: error

* remove useless changes

---------

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

examples/utest/testcases/Kconfig

@@ -11,6 +11,7 @@ source "$RTT_DIR/examples/utest/testcases/utest/Kconfig"
 source "$RTT_DIR/examples/utest/testcases/kernel/Kconfig"
 source "$RTT_DIR/examples/utest/testcases/cpp11/Kconfig"
 source "$RTT_DIR/examples/utest/testcases/drivers/serial_v2/Kconfig"
+source "$RTT_DIR/examples/utest/testcases/drivers/ipc/Kconfig"
 source "$RTT_DIR/examples/utest/testcases/posix/Kconfig"
 source "$RTT_DIR/examples/utest/testcases/mm/Kconfig"
 

examples/utest/testcases/drivers/ipc/Kconfig

@@ -0,0 +1,7 @@
+menu "Utest IPC Testcase"
+
+config UTEST_COMPLETION_TC
+    bool "rt_completion testcase"
+    default n
+
+endmenu

examples/utest/testcases/drivers/ipc/SConscript

@@ -0,0 +1,13 @@
+Import('rtconfig')
+from building import *
+
+cwd     = GetCurrentDir()
+src     = []
+CPPPATH = [cwd]
+
+if GetDepend(['UTEST_COMPLETION_TC']):
+    src += ['completion_tc.c', 'completion_timeout_tc.c']
+
+group = DefineGroup('utestcases', src, depend = ['RT_USING_UTESTCASES'], CPPPATH = CPPPATH)
+
+Return('group')

examples/utest/testcases/drivers/ipc/completion_tc.c

@@ -0,0 +1,199 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-04-30     Shell        init ver.
+ */
+
+/**
+ * Test Case for rt_completion API
+ *
+ * The test simulates a producer-consumer interaction where a producer thread
+ * generates data, and a consumer thread consumes the data after waiting for its
+ * availability using rt_completion synchronization primitives.
+ *
+ * Test Criteria:
+ * - The producer should correctly increment the test data and signal
+ *   completion.
+ * - The consumer should correctly wait for data update, consume it, and signal
+ *   completion.
+ * - Data integrity should be maintained between producer and consumer.
+ * - Synchronization is properly done so both can see consistent data.
+ * - Random latency is introduced to simulate racing scenarios.
+ */
+
+#define TEST_LATENCY_TICK (1)
+#define TEST_LOOP_TIMES   (60 * RT_TICK_PER_SECOND)
+#define TEST_PROGRESS_ON  (RT_TICK_PER_SECOND)
+
+#include "utest.h"
+
+#include <ipc/completion.h>
+#include <rtthread.h>
+#include <stdlib.h>
+
+static struct rt_completion _prod_completion;
+static struct rt_completion _cons_completion;
+static int _test_data = 0;
+static rt_atomic_t _progress_counter;
+static struct rt_semaphore _thr_exit_sem;
+
+static void done_safely(struct rt_completion *completion)
+{
+    rt_err_t error;
+
+    /* Signal completion */
+    error = rt_completion_wakeup(completion);
+
+    /* try again if failed to produce */
+    if (error == -RT_EEMPTY)
+    {
+        rt_thread_yield();
+    }
+    else if (error)
+    {
+        uassert_false(0);
+        rt_thread_delete(rt_thread_self());
+    }
+}
+
+static void wait_safely(struct rt_completion *completion)
+{
+    rt_err_t error;
+    do
+    {
+        error = rt_completion_wait_flags(completion, RT_WAITING_FOREVER,
+                                         RT_INTERRUPTIBLE);
+        if (error)
+        {
+            uassert_true(error == -RT_EINTR);
+            rt_thread_yield();
+        }
+        else
+        {
+            break;
+        }
+    } while (1);
+}
+
+static void producer_thread_entry(void *parameter)
+{
+    for (size_t i = 0; i < TEST_LOOP_TIMES; i++)
+    {
+        /* Produce data */
+        _test_data++;
+
+        /* notify consumer */
+        done_safely(&_prod_completion);
+
+        /* Delay before producing next data */
+        rt_thread_delay(TEST_LATENCY_TICK);
+
+        /* sync with consumer */
+        wait_safely(&_cons_completion);
+    }
+
+    rt_sem_release(&_thr_exit_sem);
+}
+
+static void _wait_until_edge(void)
+{
+    rt_tick_t entry_level, current;
+    rt_base_t random_latency;
+
+    entry_level = rt_tick_get();
+    do
+    {
+        current = rt_tick_get();
+    } while (current == entry_level);
+
+    /* give a random latency for test */
+    random_latency = rand();
+    entry_level = current;
+    for (size_t i = 0; i < random_latency; i++)
+    {
+        current = rt_tick_get();
+        if (current != entry_level) break;
+    }
+}
+
+static void consumer_thread_entry(void *parameter)
+{
+    int local_test_data = 0;
+
+    rt_thread_startup(parameter);
+
+    for (size_t i = 0; i < TEST_LOOP_TIMES; i++)
+    {
+        /* add more random case for test */
+        _wait_until_edge();
+
+        /* Wait for data update */
+        wait_safely(&_prod_completion);
+
+        /* Consume data */
+        if (local_test_data + 1 != _test_data)
+        {
+            LOG_I("local test data is %d, shared test data is %d",
+                  local_test_data, _test_data);
+            uassert_true(0);
+        }
+        else if (rt_atomic_add(&_progress_counter, 1) % TEST_PROGRESS_ON == 0)
+        {
+            uassert_true(1);
+        }
+
+        local_test_data = _test_data;
+        done_safely(&_cons_completion);
+    }
+
+    rt_sem_release(&_thr_exit_sem);
+}
+
+static void testcase(void)
+{
+    /* Initialize completion object */
+    rt_completion_init(&_prod_completion);
+    rt_completion_init(&_cons_completion);
+
+    /* Create producer and consumer threads */
+    rt_thread_t producer_thread =
+        rt_thread_create("producer", producer_thread_entry, RT_NULL,
+                         UTEST_THR_STACK_SIZE, UTEST_THR_PRIORITY, 100);
+    rt_thread_t consumer_thread =
+        rt_thread_create("consumer", consumer_thread_entry, producer_thread,
+                         UTEST_THR_STACK_SIZE, UTEST_THR_PRIORITY, 100);
+    uassert_true(producer_thread != RT_NULL);
+    uassert_true(consumer_thread != RT_NULL);
+
+    LOG_I("Summary:\n"
+          "\tTest times: %ds(%d)",
+          TEST_LOOP_TIMES / RT_TICK_PER_SECOND, TEST_LOOP_TIMES);
+
+    rt_thread_startup(consumer_thread);
+
+    for (size_t i = 0; i < 2; i++)
+    {
+        rt_sem_take(&_thr_exit_sem, RT_WAITING_FOREVER);
+    }
+}
+
+static rt_err_t utest_tc_init(void)
+{
+    _test_data = 0;
+    _progress_counter = 0;
+    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;
+}
+
+UTEST_TC_EXPORT(testcase, "testcases.drivers.ipc.rt_completion.basic",
+                utest_tc_init, utest_tc_cleanup, 10);

examples/utest/testcases/drivers/ipc/completion_timeout_tc.c

@@ -0,0 +1,213 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-04-30     Shell        init ver.
+ */
+
+/**
+ * Test Case for rt_completion API
+ *
+ * The test simulates a producer-consumer interaction where a producer thread
+ * generates data, and a consumer thread consumes the data after waiting for its
+ * availability using rt_completion synchronization primitives.
+ *
+ * Test Criteria:
+ * - The producer produces data correctly and notifies the consumer thread.
+ * - The consumer receives data correctly and acknowledges receipt to the
+ *   producer.
+ * - The producer and consumer threads synchronize their operations effectively.
+ * - Verify the correctness of data production and consumption between producer
+ *   and consumer threads.
+ * - The asynchronous woken of consumer thread was handled properly so the
+ *   consumer don't lose woken from producer.
+ *
+ * Test APIs:
+ * - rt_completion_init()
+ * - rt_completion_wakeup()
+ * - rt_completion_wait_flags()
+ */
+
+#define TEST_LATENCY_TICK (1)
+#define TEST_LOOP_TIMES   (60 * RT_TICK_PER_SECOND)
+#define TEST_PROGRESS_ON  (RT_TICK_PER_SECOND)
+
+#include "utest.h"
+
+#include <ipc/completion.h>
+#include <rtthread.h>
+#include <stdlib.h>
+
+static struct rt_completion _prod_completion;
+static struct rt_completion _cons_completion;
+static int _test_data;
+static int _async_intr_count;
+static rt_atomic_t _progress_counter;
+static struct rt_semaphore _thr_exit_sem;
+
+static void _test_thread_exit_failure(char *string)
+{
+    LOG_E("\t[TEST failed] %s", string);
+
+    rt_sem_release(&_thr_exit_sem);
+    rt_thread_delete(rt_thread_self());
+}
+
+static void done_safely(struct rt_completion *completion)
+{
+    rt_err_t error;
+
+    /* Signal completion */
+    error = rt_completion_wakeup(completion);
+
+    /* try again if failed to produce */
+    if (error == -RT_EEMPTY)
+    {
+        rt_thread_yield();
+    }
+    else if (error)
+    {
+        uassert_true(error == RT_EOK);
+        _test_thread_exit_failure("unexpected error");
+    }
+}
+
+static void wait_safely(struct rt_completion *completion)
+{
+    int try_times = 3;
+    rt_err_t error;
+    do
+    {
+        /* wait for one tick, to add more random */
+        error = rt_completion_wait_flags(completion, 1, RT_INTERRUPTIBLE);
+        if (error)
+        {
+            if (error == -RT_ETIMEOUT || error == -RT_EINTR)
+            {
+                _async_intr_count++;
+            }
+            else
+            {
+                LOG_I("Async event %d\n", error);
+                uassert_true(0);
+            }
+            rt_thread_yield();
+        }
+        else
+        {
+            break;
+        }
+    } while (try_times--);
+
+    if (error != RT_EOK)
+    {
+        uassert_true(error == RT_EOK);
+        _test_thread_exit_failure("wait failed");
+    }
+}
+
+static void producer_thread_entry(void *parameter)
+{
+    for (size_t i = 0; i < TEST_LOOP_TIMES; i++)
+    {
+        /* Produce data */
+        _test_data++;
+
+        /* Delay before producing next data */
+        rt_thread_delay(TEST_LATENCY_TICK);
+
+        /* notify consumer */
+        done_safely(&_prod_completion);
+
+        /* sync with consumer */
+        wait_safely(&_cons_completion);
+    }
+
+    rt_sem_release(&_thr_exit_sem);
+}
+
+static void consumer_thread_entry(void *parameter)
+{
+    int local_test_data = 0;
+
+    rt_thread_startup(parameter);
+
+    for (size_t i = 0; i < TEST_LOOP_TIMES; i++)
+    {
+        /* Wait for data update */
+        wait_safely(&_prod_completion);
+
+        /* Consume data */
+        if (local_test_data + 1 != _test_data)
+        {
+            LOG_I("local test data is %d, shared test data is %d",
+                  local_test_data, _test_data);
+            uassert_true(0);
+        }
+        else if (rt_atomic_add(&_progress_counter, 1) % TEST_PROGRESS_ON == 0)
+        {
+            uassert_true(1);
+        }
+
+        local_test_data = _test_data;
+        done_safely(&_cons_completion);
+    }
+
+    rt_sem_release(&_thr_exit_sem);
+}
+
+rt_thread_t _watching_thread1;
+rt_thread_t _watching_thread2;
+
+static void testcase(void)
+{
+    /* Initialize completion object */
+    rt_completion_init(&_prod_completion);
+    rt_completion_init(&_cons_completion);
+
+    /* Create producer and consumer threads */
+    rt_thread_t producer_thread =
+        rt_thread_create("producer", producer_thread_entry, RT_NULL,
+                         UTEST_THR_STACK_SIZE, UTEST_THR_PRIORITY, 100);
+    rt_thread_t consumer_thread =
+        rt_thread_create("consumer", consumer_thread_entry, producer_thread,
+                         UTEST_THR_STACK_SIZE, UTEST_THR_PRIORITY, 100);
+    uassert_true(producer_thread != RT_NULL);
+    uassert_true(consumer_thread != RT_NULL);
+    _watching_thread1 = consumer_thread;
+    _watching_thread2 = producer_thread;
+
+    rt_thread_startup(consumer_thread);
+
+    for (size_t i = 0; i < 2; i++)
+    {
+        rt_sem_take(&_thr_exit_sem, RT_WAITING_FOREVER);
+    }
+
+    LOG_I("Summary:\n"
+          "\tTest times: %ds(%d times)\n"
+          "\tAsync interruption count: %d\n",
+          TEST_LOOP_TIMES / RT_TICK_PER_SECOND, TEST_LOOP_TIMES,
+          _async_intr_count);
+}
+
+static rt_err_t utest_tc_init(void)
+{
+    _test_data = 0;
+    _progress_counter = 0;
+    _async_intr_count = 0;
+    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;
+}
+
+UTEST_TC_EXPORT(testcase, "testcases.drivers.ipc.rt_completion.timeout",
+                utest_tc_init, utest_tc_cleanup, 1000);