1 /* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2022-2023 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 18 #include <pthread.h> 19 #include <unistd.h> 20 #include <sys/types.h> 21 #include <sys/wait.h> 22 #include <errno.h> 23 #include <assert.h> 24 #include <limits.h> 25 26 /* Number of threads doing forks. */ 27 #define N_FORKERS 4 28 29 static void * 30 forker (void *arg) 31 { 32 for (;;) 33 { 34 pid_t pid = FORK_FUNC (); 35 36 if (pid == 0) 37 _exit (11); 38 39 assert (pid > 0); 40 41 /* Wait for children to exit. */ 42 int ret; 43 int stat; 44 do 45 { 46 ret = waitpid (pid, &stat, 0); 47 } while (ret == -1 && errno == EINTR); 48 49 assert (ret == pid); 50 assert (WIFEXITED (stat)); 51 assert (WEXITSTATUS (stat) == 11); 52 53 /* We need a sleep, otherwise the forking threads spam events and the 54 stepping thread doesn't make progress. Sleep for a bit less than 55 `sleep_a_bit` does, so that forks are likely to interrupt a "next". */ 56 usleep (40 * 1000); 57 } 58 59 return NULL; 60 } 61 62 static void 63 sleep_a_bit (void) 64 { 65 usleep (1000 * 50); 66 } 67 68 int 69 main (void) 70 { 71 int i; 72 73 alarm (60); 74 75 pthread_t thread[N_FORKERS]; 76 for (i = 0; i < N_FORKERS; ++i) 77 { 78 int ret = pthread_create (&thread[i], NULL, forker, NULL); 79 assert (ret == 0); 80 } 81 82 for (i = 0; i < INT_MAX; ++i) /* for loop */ 83 { 84 sleep_a_bit (); /* break here */ 85 sleep_a_bit (); /* other line */ 86 } 87 88 for (i = 0; i < N_FORKERS; ++i) 89 pthread_join (thread[i], NULL); 90 91 return 0; 92 } 93