1/* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2017-2020 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 <memory.h> 21 22#define NTHR 3 23#define NBOGUSTHR 2 24 25int thr_data[NTHR]; 26 27/* Thread handles for each thread plus some "bogus" threads. */ 28pthread_t thrs[NTHR + NBOGUSTHR]; 29 30/* The thread children will meet at this barrier. */ 31pthread_barrier_t c_barrier; 32 33/* The main thread and child thread will meet at this barrier. */ 34pthread_barrier_t mc_barrier; 35 36void 37do_something (int n) 38{ 39} 40 41void * 42do_work (void *data) 43{ 44 int num = * (int *) data; 45 46 /* As the child threads are created, they'll meet the main thread 47 at this barrier. We do this to ensure that threads end up in 48 GDB's thread list in the order in which they were created. Having 49 this ordering makes it easier to write the test. */ 50 pthread_barrier_wait (&mc_barrier); 51 52 /* All of the child threads will meet at this barrier before proceeding. 53 This ensures that all threads will be active (not exited) and in 54 roughly the same state when the first one hits the breakpoint in 55 do_something(). */ 56 pthread_barrier_wait (&c_barrier); 57 58 do_something (num); 59 60 pthread_exit (NULL); 61} 62 63void 64after_mc_barrier (void) 65{ 66} 67 68int 69main (int argc, char **argv) 70{ 71 int i; 72 73 pthread_barrier_init (&c_barrier, NULL, NTHR - 1); 74 pthread_barrier_init (&mc_barrier, NULL, 2); 75 76 thrs[0] = pthread_self (); 77 thr_data[0] = 1; 78 79 /* Create two bogus thread handles. */ 80 memset (&thrs[NTHR], 0, sizeof (pthread_t)); 81 memset (&thrs[NTHR + 1], 0xaa, sizeof (pthread_t)); 82 83 for (i = 1; i < NTHR; i++) 84 { 85 thr_data[i] = i + 1; 86 87 pthread_create (&thrs[i], NULL, do_work, &thr_data[i]); 88 pthread_barrier_wait (&mc_barrier); 89 after_mc_barrier (); 90 } 91 92 for (i = 1; i < NTHR; i++) 93 pthread_join (thrs[i], NULL); 94} 95