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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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#include <time.h>
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// 引入系统函数nanosleep，该函数用于使当前线程休眠指定的时间。
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extern int nanosleep(const struct timespec *req, struct timespec *rem);
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// 定义全局互斥锁 g_mux，用于同步多线程操作。
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static pthread_mutex_t g_mux = PTHREAD_MUTEX_INITIALIZER;
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// 定义全局变量，跟踪fork相关的操作计数和状态。
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static volatile int g_testAtforkCount = 0; // 记录fork次数的计数器
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static int g_testAtforkPrepare = 0; // 用于标识准备状态的计数器
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static int g_testAtforkParent = 0; // 用于标识父进程状态的计数器
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// 线程函数Doit，用于在锁保护下进行nanosleep操作。
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static void *Doit(void *arg)
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{
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int err;
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struct timespec ts = { 2, 0 }; // 设置休眠时间为2秒，第二个参数为纳秒（0表示不需要额外的纳秒部分）。
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// 检查g_testAtforkCount是否为1，如果不是，跳转到EXIT标签。
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ICUNIT_GOTO_EQUAL(g_testAtforkCount, 1, g_testAtforkCount, EXIT);
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// 锁住g_mux互斥锁，保证对共享资源的访问是线程安全的。
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err = pthread_mutex_lock(&g_mux);
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ICUNIT_GOTO_EQUAL(err, 0, err, EXIT);
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// 让当前线程休眠2秒。
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(void)nanosleep(&ts, NULL);
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// 解锁g_mux互斥锁。
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err = pthread_mutex_unlock(&g_mux);
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ICUNIT_GOTO_EQUAL(err, 0, err, EXIT);
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EXIT:
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// 函数结束，返回NULL表示没有错误。
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return NULL;
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}
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// 线程函数Doit1，与Doit函数功能相同，都是进行互斥锁保护下的nanosleep操作。
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static void *Doit1(void *arg)
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{
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int err;
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struct timespec ts = { 2, 0 }; // 设置休眠时间为2秒。
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// 检查g_testAtforkCount是否为1，如果不是，跳转到EXIT标签。
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ICUNIT_GOTO_EQUAL(g_testAtforkCount, 1, g_testAtforkCount, EXIT);
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// 锁住g_mux互斥锁，保证对共享资源的访问是线程安全的。
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err = pthread_mutex_lock(&g_mux);
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ICUNIT_GOTO_EQUAL(err, 0, err, EXIT);
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// 让当前线程休眠2秒。
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(void)nanosleep(&ts, NULL);
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// 解锁g_mux互斥锁。
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err = pthread_mutex_unlock(&g_mux);
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ICUNIT_GOTO_EQUAL(err, 0, err, EXIT);
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EXIT:
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// 函数结束，返回NULL表示没有错误。
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return NULL;
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}
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// Prepare函数用于准备阶段，释放锁并更新g_testAtforkPrepare计数器。
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static void Prepare(void)
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{
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int err;
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// 尝试解锁g_mux互斥锁，若没有锁住，则返回错误。
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err = pthread_mutex_unlock(&g_mux);
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ICUNIT_ASSERT_EQUAL_VOID(err, 0, err); // 校验解锁是否成功，若不成功则会引发错误。
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// 更新g_testAtforkPrepare计数器，表示已准备好。
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g_testAtforkPrepare++;
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}
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// Parent函数用于父进程阶段，获取锁并更新g_testAtforkParent计数器。
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static void Parent(void)
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{
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int err = pthread_mutex_lock(&g_mux); // 锁住g_mux互斥锁。
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ICUNIT_ASSERT_EQUAL_VOID(err, 0, err); // 校验锁住是否成功，若不成功则会引发错误。
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// 更新g_testAtforkParent计数器，表示父进程已进入阶段。
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g_testAtforkParent++;
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}
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// PthreadAtforkTest函数的作用是进行多线程与fork操作的测试，验证pthread_atfork()的行为。
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static void *PthreadAtforkTest(void *arg)
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{
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int err, ret;
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int pid;
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int status = 0;
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struct timespec ts = { 1, 0 }; // 定义一个timespec结构，指定nanosleep时休眠1秒。
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pthread_t tid; // 定义一个线程ID变量，用于存储创建的线程的ID。
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// 初始化全局变量，跟踪fork相关的操作计数和状态。
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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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// 使用pthread_atfork注册处理函数，分别为子进程准备函数Prepare和父进程函数Parent。
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// NULL表示没有为子进程注册处理函数。
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err = pthread_atfork(Prepare, Parent, NULL);
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ICUNIT_GOTO_EQUAL(err, 0, err, EXIT); // 如果pthread_atfork返回错误，跳转到EXIT标签。
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// 将g_testAtforkCount计数器加1，表示准备开始执行fork操作。
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g_testAtforkCount++;
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// 创建一个新线程，线程的执行函数是Doit。
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err = pthread_create(&tid, NULL, Doit, NULL);
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ICUNIT_GOTO_EQUAL(err, 0, err, EXIT); // 如果pthread_create失败，跳转到EXIT标签。
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// 让当前线程休眠1秒，确保线程和主线程有足够的时间进入适当的执行阶段。
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nanosleep(&ts, NULL);
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// 执行fork系统调用，创建一个新进程。
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pid = fork();
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ICUNIT_GOTO_EQUAL(g_testAtforkPrepare, 1, g_testAtforkPrepare, EXIT); // 确保在fork后，Prepare函数已经被调用。
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if (pid == 0) { // 子进程执行的代码。
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// 调用Doit1函数，子进程将在此执行，休眠2秒。
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Doit1(NULL);
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exit(10); // 10表示子进程的退出状态。
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}
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// 检查pid值是否合法，确保fork操作成功并且pid不会超过100000。
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ICUNIT_GOTO_WITHIN_EQUAL(pid, 0, 100000, pid, EXIT_WAIT);
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// 确保父进程调用了Parent函数，更新了g_testAtforkParent计数器。
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ICUNIT_GOTO_EQUAL(g_testAtforkParent, 1, g_testAtforkParent, EXIT_WAIT);
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// 等待创建的线程结束。
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err = pthread_join(tid, NULL);
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ICUNIT_GOTO_EQUAL(err, 0, err, EXIT_WAIT); // 如果pthread_join失败，跳转到EXIT_WAIT标签。
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// 等待子进程结束，并获取其退出状态。
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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); // 检查waitpid返回值是否与pid一致。
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ICUNIT_GOTO_EQUAL(status, 10, status, EXIT); // 确保子进程的退出状态是10。
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EXIT:
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return NULL; // 函数结束，返回NULL。
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EXIT_WAIT:
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// 如果到达EXIT_WAIT标签，表示需要等待子进程的结束，防止僵尸进程。
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(void)waitpid(pid, 0, 0);
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return NULL;
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}
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static int Testcase(void)
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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 ItTestPthreadAtfork002(void)
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{
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TEST_ADD_CASE("IT_PTHREAD_ATFORK_002", Testcase, TEST_POSIX, TEST_MEM, TEST_LEVEL0, TEST_FUNCTION);
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}
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