1/* This testcase is part of GDB, the GNU debugger.
2
3   Copyright 2022-2023 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 <sys/syscall.h>
21
22#define NUM_THREADS 32
23
24pthread_barrier_t barrier;
25
26static void
27do_exit (int exitcode)
28{
29  /* Synchronize all threads up to here so that they all exit at
30     roughly the same time.  */
31  pthread_barrier_wait (&barrier);
32
33  /* All threads exit with SYS_exit, even the main thread, to avoid
34     exiting with a group-exit syscall, as that syscall changes the
35     exit status of all still-alive threads, thus potentially masking
36     a bug.  */
37  syscall (SYS_exit, exitcode);
38}
39
40static void *
41start (void *arg)
42{
43  int thread_return_value = *(int *) arg;
44
45  do_exit (thread_return_value);
46}
47
48int
49main(void)
50{
51  pthread_t threads[NUM_THREADS];
52  int thread_return_val[NUM_THREADS];
53  int i;
54
55  pthread_barrier_init (&barrier, NULL, NUM_THREADS + 1);
56
57  for (i = 0; i < NUM_THREADS; ++i)
58    {
59      thread_return_val[i] = i + 2;
60      pthread_create (&threads[i], NULL, start, &thread_return_val[i]);
61    }
62
63  do_exit (1);
64}
65