1 /* This test program is part of GDB, The GNU debugger. 2 3 Copyright 2004-2020 Free Software Foundation, Inc. 4 5 Originally written by Jeff Johnston <jjohnstn@redhat.com>, 6 contributed by Red Hat 7 8 This file is part of GDB. 9 10 This program is free software; you can redistribute it and/or modify 11 it under the terms of the GNU General Public License as published by 12 the Free Software Foundation; either version 3 of the License, or 13 (at your option) any later version. 14 15 This program is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 GNU General Public License for more details. 19 20 You should have received a copy of the GNU General Public License 21 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 22 23 #include <pthread.h> 24 #include <semaphore.h> 25 #include <stdio.h> 26 #include <limits.h> 27 #include <errno.h> 28 29 sem_t semaphore; 30 31 #ifdef HAVE_TLS 32 __thread int tlsvar; 33 #endif 34 35 void * 36 thread_function (void *arg) 37 { 38 #ifdef HAVE_TLS 39 tlsvar = 2; 40 #endif 41 while (sem_wait (&semaphore) != 0) 42 { 43 if (errno != EINTR) 44 { 45 perror ("thread_function"); 46 return NULL; 47 } 48 } 49 printf ("Thread executing\n"); /* tlsvar-is-set */ 50 return NULL; 51 } 52 53 int 54 main (int argc, char **argv) 55 { 56 pthread_attr_t attr; 57 58 pthread_attr_init (&attr); 59 pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN); 60 61 if (sem_init (&semaphore, 0, 0) == -1) 62 { 63 perror ("semaphore"); 64 return -1; 65 } 66 67 #ifdef HAVE_TLS 68 tlsvar = 1; 69 #endif 70 71 /* Create a thread, wait for it to complete. */ 72 { 73 pthread_t thread; 74 pthread_create (&thread, &attr, thread_function, NULL); 75 sem_post (&semaphore); 76 pthread_join (thread, NULL); 77 } 78 79 pthread_attr_destroy (&attr); 80 return 0; 81 } 82