| /* Copyright 2023-2024 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include <pthread.h> |
| #include <unistd.h> |
| #include <stdlib.h> |
| |
| #define NTHREAD 1 |
| |
| /* Barrier for synchronising threads. */ |
| static pthread_barrier_t barrier; |
| |
| /* Wrapper around pthread_barrier_wait that aborts if the wait returns an |
| error. */ |
| static void |
| barrier_wait (pthread_barrier_t *barrier) |
| { |
| int res = pthread_barrier_wait (barrier); |
| if (res != PTHREAD_BARRIER_SERIAL_THREAD && res != 0) |
| abort (); |
| } |
| |
| /* GDB can set this to 0 to force the 'spin' function to return. */ |
| volatile int do_spin = 1; |
| |
| void |
| breakpt () |
| { |
| /* Nothing. */ |
| } |
| |
| /* Spin for a reasonably long while (this lets GDB run some commands in |
| async mode), but return early if/when do_spin is set to 0 (which is done |
| by GDB). */ |
| |
| void |
| spin () |
| { |
| int i; |
| |
| for (i = 0; i < 300 && do_spin; ++i) |
| sleep (1); |
| } |
| |
| void * |
| thread_worker (void *arg) |
| { |
| barrier_wait (&barrier); |
| return NULL; |
| } |
| |
| int |
| main () |
| { |
| pthread_t thr[NTHREAD]; |
| int i; |
| |
| if (pthread_barrier_init (&barrier, NULL, NTHREAD + 1) != 0) |
| abort (); |
| |
| for (i = 0; i < NTHREAD; ++i) |
| pthread_create (&thr[i], NULL, thread_worker, NULL); |
| |
| breakpt (); /* First breakpoint. */ |
| |
| barrier_wait (&barrier); |
| |
| for (i = 0; i < NTHREAD; ++i) |
| pthread_join (thr[i], NULL); |
| |
| spin (); |
| |
| breakpt (); |
| } |