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tests/count-f.c
83 строки
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Dmitry V. Levin
tests/count-f.c: fix race condition
29 ноя 2021, 23:00
29 ноя 2021, 23:00
3fc392b
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/* * This file is part of count-f strace test. * * Copyright (c) 2016-2021 Dmitry V. Levin <ldv@strace.io> * All rights reserved. * * SPDX-License-Identifier: GPL-2.0-or-later */ #include "tests.h" #include <assert.h> #include <errno.h> #include <pthread.h> #include <stdio.h> #include <stdlib.h> #include <sys/wait.h> #include <unistd.h> #define N 32 #define P 8 #define T 4 static void * thread(void *arg) { assert(chdir(".") == 0); for (unsigned int i = 0; i < N; ++i) { assert(chdir("") == -1); assert(chdir(".") == 0); } return NULL; } static int process(void) { pthread_t t[T]; for (unsigned int i = 0; i < T; ++i) { errno = pthread_create(&t[i], NULL, thread, NULL); if (errno) perror_msg_and_fail("pthread_create"); } for (unsigned int i = 0; i < T; ++i) { void *retval; errno = pthread_join(t[i], &retval); if (errno) perror_msg_and_fail("pthread_join"); } return 0; } int main(void) { pid_t p[P]; for (unsigned int i = 0; i < P; ++i) { p[i] = fork(); if (p[i] < 0) perror_msg_and_fail("fork"); if (!p[i]) return process(); } for (unsigned int i = 0; i < P; ++i) { int s; pid_t rc; while ((rc = waitpid(p[i], &s, 0)) != p[i]) { if (rc < 0 && errno == EINTR) continue; perror_msg_and_fail("waitpid: %d", p[i]); } assert(WIFEXITED(s)); if (WEXITSTATUS(s)) return WEXITSTATUS(s); } return 0; }