1 /* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2002-2016 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 This file is copied from schedlock.c. */ 19 20 #include <stdio.h> 21 #include <unistd.h> 22 #include <stdlib.h> 23 #include <pthread.h> 24 25 void *thread_function (void *arg); /* Function executed by each thread. */ 26 27 #define NUM 5 28 29 unsigned int args[NUM+1]; 30 31 int 32 main () 33 { 34 int res; 35 pthread_t threads[NUM]; 36 void *thread_result; 37 long i; 38 39 /* To keep the test determinative, initialize args first, 40 then start all the threads. Otherwise, the way watchthreads.exp 41 is written, we have to worry about things like threads[0] getting 42 to 29 hits of args[0] before args[1] gets changed. */ 43 44 for (i = 0; i < NUM; i++) 45 { 46 /* The call to usleep is so that when the watchpoint triggers, 47 the pc is still on the same line. */ 48 args[i] = 1; usleep (1); /* Init value. */ 49 } 50 51 for (i = 0; i < NUM; i++) 52 { 53 res = pthread_create (&threads[i], 54 NULL, 55 thread_function, 56 (void *) i); 57 } 58 59 args[i] = 1; 60 thread_function ((void *) i); 61 62 exit (EXIT_SUCCESS); 63 } 64 65 void * 66 thread_function (void *arg) 67 { 68 int my_number = (long) arg; 69 int *myp = (int *) &args[my_number]; 70 71 /* Don't run forever. Run just short of it :) */ 72 while (*myp > 0) 73 { 74 (*myp) ++; usleep (1); /* Loop increment. */ 75 } 76 77 pthread_exit (NULL); 78 } 79 80