1 /* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2009-2023 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 <stdlib.h> 21 #include <stdio.h> 22 #include <string.h> 23 #include <assert.h> 24 25 static const char *image; 26 static pthread_barrier_t barrier; 27 static char *argv1 = "go away"; 28 29 static void * 30 thread_execler (void *arg) 31 { 32 int i; 33 34 pthread_barrier_wait (&barrier); 35 36 /* Exec ourselves again. */ 37 if (execl (image, image, argv1, NULL) == -1) /* break-here */ 38 { 39 perror ("execl"); 40 abort (); 41 } 42 43 return NULL; 44 } 45 46 static void * 47 just_loop (void *arg) 48 { 49 unsigned int i; 50 51 pthread_barrier_wait (&barrier); 52 53 for (i = 1; i > 0; i++) 54 usleep (1); 55 56 return NULL; 57 } 58 59 #define THREADS 5 60 61 pthread_t loop_thread[THREADS]; 62 63 int 64 main (int argc, char **argv) 65 { 66 pthread_t thread; 67 int i, t; 68 69 image = argv[0]; 70 71 /* Pass "inf" as argument to keep re-execing ad infinitum, which can 72 be useful for manual testing. Passing any other argument exits 73 immediately (and that's what the execl above does by 74 default). */ 75 if (argc == 2 && strcmp (argv[1], "inf") == 0) 76 argv1 = argv[1]; 77 else if (argc > 1) 78 exit (0); 79 80 pthread_barrier_init (&barrier, NULL, 2 + THREADS); 81 82 i = pthread_create (&thread, NULL, thread_execler, NULL); 83 assert (i == 0); 84 85 for (t = 0; t < THREADS; t++) 86 { 87 i = pthread_create (&loop_thread[t], NULL, just_loop, NULL); 88 assert (i == 0); 89 } 90 91 pthread_barrier_wait (&barrier); 92 pthread_join (thread, NULL); 93 return 0; 94 } 95