1 /* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2009-2015 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 <assert.h> 22 23 static const char *image; 24 static pthread_barrier_t barrier; 25 static char *argv1 = "go away"; 26 27 static void * 28 thread_execler (void *arg) 29 { 30 int i; 31 32 pthread_barrier_wait (&barrier); 33 34 /* Exec ourselves again. */ 35 if (execl (image, image, argv1, NULL) == -1) /* break-here */ 36 { 37 perror ("execl"); 38 abort (); 39 } 40 41 return NULL; 42 } 43 44 static void * 45 just_loop (void *arg) 46 { 47 unsigned int i; 48 49 pthread_barrier_wait (&barrier); 50 51 for (i = 1; i > 0; i++) 52 usleep (1); 53 54 return NULL; 55 } 56 57 #define THREADS 5 58 59 pthread_t loop_thread[THREADS]; 60 61 int 62 main (int argc, char **argv) 63 { 64 pthread_t thread; 65 int i, t; 66 67 image = argv[0]; 68 69 /* Pass "inf" as argument to keep re-execing ad infinitum, which can 70 be useful for manual testing. Passing any other argument exits 71 immediately (and that's what the execl above does by 72 default). */ 73 if (argc == 2 && strcmp (argv[1], "inf") == 0) 74 argv1 = argv[1]; 75 else if (argc > 1) 76 exit (0); 77 78 pthread_barrier_init (&barrier, NULL, 2 + THREADS); 79 80 i = pthread_create (&thread, NULL, thread_execler, NULL); 81 assert (i == 0); 82 83 for (t = 0; t < THREADS; t++) 84 { 85 i = pthread_create (&loop_thread[t], NULL, just_loop, NULL); 86 assert (i == 0); 87 } 88 89 pthread_barrier_wait (&barrier); 90 pthread_join (thread, NULL); 91 return 0; 92 } 93