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/*
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* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
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* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "it_pthread_test.h"
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static volatile int g_count = 0;
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static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
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static int g_testAtforkCount = 0;
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static int g_testAtforkPrepare = 0;
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static int g_testAtforkParent = 0;
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static int g_testAtforkChild = 0;
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static const int SLEEP_TIME = 2;
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static void Prepare()
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{
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int err;
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ICUNIT_ASSERT_EQUAL_VOID(g_testAtforkCount, 1, g_testAtforkCount);
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// 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。
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err = pthread_mutex_lock(&g_lock);
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// 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。
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ICUNIT_ASSERT_EQUAL_VOID(err, 0, err);
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g_testAtforkPrepare++;
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}
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static void Parent()
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{
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int err;
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ICUNIT_ASSERT_EQUAL_VOID(g_testAtforkCount, 1, g_testAtforkCount);
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err = pthread_mutex_unlock(&g_lock);
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// 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。
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ICUNIT_ASSERT_EQUAL_VOID(err, 0, err);
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g_testAtforkParent++;
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// 增加 g_testAtforkParent，表示父进程执行完其相关操作。
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}
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static void child()
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{
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int err;
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ICUNIT_ASSERT_EQUAL_VOID(g_testAtforkCount, 1, g_testAtforkCount);
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err = pthread_mutex_unlock(&g_lock);
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ICUNIT_ASSERT_EQUAL_VOID(err, 0, err);
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g_testAtforkChild++;
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// 增加 g_testAtforkChild，表示子进程执行完其相关操作。
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}
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static void *ThreadProc(void *arg)
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{
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int err;
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// 进入一个循环，直到 g_count 达到 5。
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while (g_count < 5) {
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// 锁住互斥量 g_lock，保护 g_count 的更新，防止并发修改。
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err = pthread_mutex_lock(&g_lock);
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ICUNIT_GOTO_EQUAL(err, 0, err, EXIT);
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// 增加 g_count 的值，表示执行了一次计数。
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g_count++;
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// 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。
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SLEEP_AND_YIELD(SLEEP_TIME);
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// 解锁互斥量 g_lock，允许其他线程访问被保护的资源。
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err = pthread_mutex_unlock(&g_lock);
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ICUNIT_GOTO_EQUAL(err, 0, err, EXIT);
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// 再次调用 SLEEP_AND_YIELD 宏函数，让当前线程休眠并让出 CPU。
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SLEEP_AND_YIELD(SLEEP_TIME);
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}
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EXIT:
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return NULL;
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}
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static void *PthreadAtforkTest(void *arg)
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{
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int err;
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pid_t pid;
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pthread_t tid;
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int status = 0;
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// 初始化共享变量 g_count 和测试相关的变量
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g_count = 0;
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g_testAtforkCount = 0;
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g_testAtforkPrepare = 0;
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g_testAtforkParent = 0;
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g_testAtforkChild = 0;
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// 创建一个新的线程
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err = pthread_create(&tid, NULL, ThreadProc, NULL);
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ICUNIT_GOTO_EQUAL(err, 0, err, EXIT);
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// 注册 fork 前的处理函数
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err = pthread_atfork(Prepare, Parent, child);
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ICUNIT_GOTO_EQUAL(err, 0, err, EXIT);
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// 更新测试计数器，标记已创建线程
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g_testAtforkCount++;
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// 休眠并让出 CPU 控制
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SLEEP_AND_YIELD(SLEEP_TIME);
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// 调用 fork() 创建子进程
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pid = fork();
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ICUNIT_GOTO_WITHIN_EQUAL(pid, 0, 100000, pid, EXIT); // 100000, PID 不会超过 100000
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ICUNIT_GOTO_EQUAL(g_testAtforkPrepare, 1, g_testAtforkPrepare, EXIT);
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// 子进程的处理逻辑
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if (pid == 0) {
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// 子进程中，检查 g_testAtforkChild 是否为 1，确认子进程的状态
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ICUNIT_GOTO_EQUAL(g_testAtforkChild, 1, g_testAtforkChild, EXIT);
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// 子进程进入循环，直到 g_count 达到 5
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while (g_count < 5) {
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// 加锁，保护 g_count
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err = pthread_mutex_lock(&g_lock);
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ICUNIT_GOTO_EQUAL(err, 0, err, EXIT);
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// 增加 g_count
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g_count++;
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// 休眠并让出 CPU 控制
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SLEEP_AND_YIELD(SLEEP_TIME);
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// 解锁
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err = pthread_mutex_unlock(&g_lock);
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ICUNIT_GOTO_EQUAL(err, 0, err, EXIT);
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// 休眠并让出 CPU 控制
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SLEEP_AND_YIELD(SLEEP_TIME);
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}
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// 子进程退出，设置退出状态为 15
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exit(15); // 15, 设置退出状态
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}
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// 父进程中，检查 g_testAtforkParent 是否为 1，确认父进程的状态
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ICUNIT_GOTO_EQUAL(g_testAtforkParent, 1, g_testAtforkParent, EXIT_WAIT);
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// 等待子线程结束
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err = pthread_join(tid, NULL);
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ICUNIT_GOTO_EQUAL(err, 0, err, EXIT_WAIT);
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// 父进程等待子进程退出
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err = waitpid(pid, &status, 0);
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status = WEXITSTATUS(status); // 获取子进程的退出状态
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ICUNIT_GOTO_EQUAL(err, pid, err, EXIT);
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ICUNIT_GOTO_EQUAL(status, 15, status, EXIT); // 检查子进程的退出状态是否为 15
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EXIT:
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return NULL;
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EXIT_WAIT:
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// 父进程等待子进程退出
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(void)waitpid(pid, &status, 0);
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return NULL;
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}
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static int Testcase()
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{
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int ret;
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pthread_t newPthread;
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int curThreadPri, curThreadPolicy;
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pthread_attr_t a = { 0 };
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struct sched_param param = { 0 };
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ret = pthread_getschedparam(pthread_self(), &curThreadPolicy, ¶m);
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ICUNIT_ASSERT_EQUAL(ret, 0, -ret);
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curThreadPri = param.sched_priority;
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ret = pthread_attr_init(&a);
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pthread_attr_setinheritsched(&a, PTHREAD_EXPLICIT_SCHED);
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param.sched_priority = curThreadPri + 2; // 2, adjust the priority.
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pthread_attr_setschedparam(&a, ¶m);
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ret = pthread_create(&newPthread, &a, PthreadAtforkTest, 0);
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ICUNIT_ASSERT_EQUAL(ret, 0, ret);
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ret = pthread_join(newPthread, NULL);
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ICUNIT_ASSERT_EQUAL(ret, 0, ret);
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return 0;
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}
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void ItTestPthreadAtfork001(void)
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{
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TEST_ADD_CASE("IT_PTHREAD_ATFORK_001", Testcase, TEST_POSIX, TEST_MEM, TEST_LEVEL0, TEST_FUNCTION);
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}
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