From 0fad9f57a66ae789318313a220e75421a54c7050 Mon Sep 17 00:00:00 2001 From: xiongzhuozi <1197363168@qq.com> Date: Mon, 23 Dec 2024 20:22:34 +0800 Subject: [PATCH] =?UTF-8?q?=E6=89=B9=E6=B3=A8001?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- pthread_atfork_test_001.cpp | 218 ++++++++++++++++++++++++++++++++++++ 1 file changed, 218 insertions(+) create mode 100644 pthread_atfork_test_001.cpp diff --git a/pthread_atfork_test_001.cpp b/pthread_atfork_test_001.cpp new file mode 100644 index 0000000..1ed1b31 --- /dev/null +++ b/pthread_atfork_test_001.cpp @@ -0,0 +1,218 @@ +/* + * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved. + * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this list of + * conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, this list + * of conditions and the following disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * 3. Neither the name of the copyright holder nor the names of its contributors may be used + * to endorse or promote products derived from this software without specific prior written + * permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; + * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR + * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF + * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ +#include "it_pthread_test.h" + +static volatile int g_count = 0; +static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER; +static int g_testAtforkCount = 0; +static int g_testAtforkPrepare = 0; +static int g_testAtforkParent = 0; +static int g_testAtforkChild = 0; +static const int SLEEP_TIME = 2; + +static void Prepare() +{ + int err; + ICUNIT_ASSERT_EQUAL_VOID(g_testAtforkCount, 1, g_testAtforkCount); +// 这是一个宏，用于检查条件是否满足。如果条件不满足，测试会停止并输出相应的信息。这里的作用是确保 g_testAtforkCount 等于 1。 + err = pthread_mutex_lock(&g_lock); +// 这行代码试图获取互斥锁 g_lock，如果获取成功，g_testAtforkPrepare 会自增，表示该线程执行了准备工作。 + ICUNIT_ASSERT_EQUAL_VOID(err, 0, err); + g_testAtforkPrepare++; +} + +static void Parent() +{ + int err; + ICUNIT_ASSERT_EQUAL_VOID(g_testAtforkCount, 1, g_testAtforkCount); + + err = pthread_mutex_unlock(&g_lock); +// 这行代码释放之前在 Prepare 函数中锁定的互斥量 g_lock，允许其他线程访问临界区。 + ICUNIT_ASSERT_EQUAL_VOID(err, 0, err); + g_testAtforkParent++; +// 增加 g_testAtforkParent，表示父进程执行完其相关操作。 +} + +static void child() +{ + int err; + ICUNIT_ASSERT_EQUAL_VOID(g_testAtforkCount, 1, g_testAtforkCount); + + err = pthread_mutex_unlock(&g_lock); + ICUNIT_ASSERT_EQUAL_VOID(err, 0, err); + g_testAtforkChild++; +// 增加 g_testAtforkChild，表示子进程执行完其相关操作。 +} + +static void *ThreadProc(void *arg) +{ + int err; + + // 进入一个循环，直到 g_count 达到 5。 + while (g_count < 5) { + // 锁住互斥量 g_lock，保护 g_count 的更新，防止并发修改。 + err = pthread_mutex_lock(&g_lock); + ICUNIT_GOTO_EQUAL(err, 0, err, EXIT); + + // 增加 g_count 的值，表示执行了一次计数。 + g_count++; + + // 调用 SLEEP_AND_YIELD 宏函数，让当前线程休眠一段时间并让出 CPU，允许其他线程执行。 + SLEEP_AND_YIELD(SLEEP_TIME); + + // 解锁互斥量 g_lock，允许其他线程访问被保护的资源。 + err = pthread_mutex_unlock(&g_lock); + ICUNIT_GOTO_EQUAL(err, 0, err, EXIT); + + // 再次调用 SLEEP_AND_YIELD 宏函数，让当前线程休眠并让出 CPU。 + SLEEP_AND_YIELD(SLEEP_TIME); + } + +EXIT: + return NULL; +} + + +static void *PthreadAtforkTest(void *arg) +{ + int err; + pid_t pid; + pthread_t tid; + int status = 0; + + // 初始化共享变量 g_count 和测试相关的变量 + g_count = 0; + g_testAtforkCount = 0; + g_testAtforkPrepare = 0; + g_testAtforkParent = 0; + g_testAtforkChild = 0; + + // 创建一个新的线程 + err = pthread_create(&tid, NULL, ThreadProc, NULL); + ICUNIT_GOTO_EQUAL(err, 0, err, EXIT); + + // 注册 fork 前的处理函数 + err = pthread_atfork(Prepare, Parent, child); + ICUNIT_GOTO_EQUAL(err, 0, err, EXIT); + + // 更新测试计数器，标记已创建线程 + g_testAtforkCount++; + + // 休眠并让出 CPU 控制 + SLEEP_AND_YIELD(SLEEP_TIME); + + // 调用 fork() 创建子进程 + pid = fork(); + ICUNIT_GOTO_WITHIN_EQUAL(pid, 0, 100000, pid, EXIT); // 100000, PID 不会超过 100000 + ICUNIT_GOTO_EQUAL(g_testAtforkPrepare, 1, g_testAtforkPrepare, EXIT); + + // 子进程的处理逻辑 + if (pid == 0) { + // 子进程中，检查 g_testAtforkChild 是否为 1，确认子进程的状态 + ICUNIT_GOTO_EQUAL(g_testAtforkChild, 1, g_testAtforkChild, EXIT); + + // 子进程进入循环，直到 g_count 达到 5 + while (g_count < 5) { + // 加锁，保护 g_count + err = pthread_mutex_lock(&g_lock); + ICUNIT_GOTO_EQUAL(err, 0, err, EXIT); + + // 增加 g_count + g_count++; + + // 休眠并让出 CPU 控制 + SLEEP_AND_YIELD(SLEEP_TIME); + + // 解锁 + err = pthread_mutex_unlock(&g_lock); + ICUNIT_GOTO_EQUAL(err, 0, err, EXIT); + + // 休眠并让出 CPU 控制 + SLEEP_AND_YIELD(SLEEP_TIME); + } + + // 子进程退出，设置退出状态为 15 + exit(15); // 15, 设置退出状态 + } + + // 父进程中，检查 g_testAtforkParent 是否为 1，确认父进程的状态 + ICUNIT_GOTO_EQUAL(g_testAtforkParent, 1, g_testAtforkParent, EXIT_WAIT); + + // 等待子线程结束 + err = pthread_join(tid, NULL); + ICUNIT_GOTO_EQUAL(err, 0, err, EXIT_WAIT); + + // 父进程等待子进程退出 + err = waitpid(pid, &status, 0); + status = WEXITSTATUS(status); // 获取子进程的退出状态 + ICUNIT_GOTO_EQUAL(err, pid, err, EXIT); + ICUNIT_GOTO_EQUAL(status, 15, status, EXIT); // 检查子进程的退出状态是否为 15 + +EXIT: + return NULL; + +EXIT_WAIT: + // 父进程等待子进程退出 + (void)waitpid(pid, &status, 0); + return NULL; +} + + +static int Testcase() +{ + int ret; + pthread_t newPthread; + int curThreadPri, curThreadPolicy; + pthread_attr_t a = { 0 }; + struct sched_param param = { 0 }; + + ret = pthread_getschedparam(pthread_self(), &curThreadPolicy, ¶m); + ICUNIT_ASSERT_EQUAL(ret, 0, -ret); + + curThreadPri = param.sched_priority; + + ret = pthread_attr_init(&a); + pthread_attr_setinheritsched(&a, PTHREAD_EXPLICIT_SCHED); + param.sched_priority = curThreadPri + 2; // 2, adjust the priority. + pthread_attr_setschedparam(&a, ¶m); + ret = pthread_create(&newPthread, &a, PthreadAtforkTest, 0); + ICUNIT_ASSERT_EQUAL(ret, 0, ret); + + ret = pthread_join(newPthread, NULL); + ICUNIT_ASSERT_EQUAL(ret, 0, ret); + + return 0; +} + +void ItTestPthreadAtfork001(void) +{ + TEST_ADD_CASE("IT_PTHREAD_ATFORK_001", Testcase, TEST_POSIX, TEST_MEM, TEST_LEVEL0, TEST_FUNCTION); +}