/*1212 * 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); }