1/* This testcase is part of GDB, the GNU debugger.
2
3   Copyright 2008-2023 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 <assert.h>
20#include <unistd.h>
21#include <stdio.h>
22#include <stdlib.h>
23#include <errno.h>
24#include <unistd.h>
25#include <sys/types.h>
26#include <sys/wait.h>
27
28#define NUMTHREADS 10
29
30volatile int done = 0;
31static pthread_barrier_t barrier;
32
33static void *
34start (void *arg)
35{
36  while (!done)
37    usleep (100);
38  assert (0);
39  return arg;
40}
41
42void *
43thread_function (void *arg)
44{
45  int x = * (int *) arg;
46
47  printf ("Thread <%d> executing\n", x);
48
49  pthread_barrier_wait (&barrier);
50
51  while (!done)
52    usleep (100);
53
54  return NULL;
55}
56
57void *
58thread_forker (void *arg)
59{
60  int x = * (int *) arg;
61  pid_t pid;
62  int rv;
63  int i;
64  pthread_t thread;
65
66  printf ("Thread forker <%d> executing\n", x);
67
68  pthread_barrier_wait (&barrier);
69
70  switch ((pid = fork ()))
71    {
72    case -1:
73      assert (0);
74    default:
75      wait (&rv);
76      done = 1;
77      break;
78    case 0:
79      i = pthread_create (&thread, NULL, start, NULL);
80      assert (i == 0);
81      i = pthread_join (thread, NULL);
82      assert (i == 0);
83
84      assert (0);
85    }
86
87  return NULL;
88}
89
90int
91main (void)
92{
93  pthread_t threads[NUMTHREADS];
94  int args[NUMTHREADS];
95  int i, j;
96
97  alarm (600);
98
99  i = pthread_barrier_init (&barrier, NULL, NUMTHREADS);
100  assert (i == 0);
101
102  /* Create a few threads that do mostly nothing, and then one that
103     forks.  */
104  for (j = 0; j < NUMTHREADS - 1; ++j)
105    {
106      args[j] = j;
107      pthread_create (&threads[j], NULL, thread_function, &args[j]);
108    }
109
110  args[j] = j;
111  pthread_create (&threads[j], NULL, thread_forker, &args[j]);
112
113  for (j = 0; j < NUMTHREADS; ++j)
114    {
115      pthread_join (threads[j], NULL);
116    }
117
118  return 0;
119}
120