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/* Copyright 2023 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 ();
}
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