aboutsummaryrefslogtreecommitdiff
path: root/gdb/testsuite/gdb.threads/interrupted-hand-call.c
blob: 0a3e6f9d01aeb4f45cacd1567e7d173940bdd267 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
/* Test case for hand function calls interrupted by a signal in another thread.

   Copyright 2008-2013 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 <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>

#ifndef NR_THREADS
#define NR_THREADS 4
#endif

pthread_t threads[NR_THREADS];

/* Number of threads currently running.  */
int thread_count;

pthread_mutex_t thread_count_mutex;

pthread_cond_t thread_count_condvar;

sig_atomic_t sigabrt_received;

void
incr_thread_count (void)
{
  pthread_mutex_lock (&thread_count_mutex);
  ++thread_count;
  if (thread_count == NR_THREADS)
    pthread_cond_signal (&thread_count_condvar);
  pthread_mutex_unlock (&thread_count_mutex);
}

void
cond_wait (pthread_cond_t *cond, pthread_mutex_t *mut)
{
  pthread_mutex_lock (mut);
  pthread_cond_wait (cond, mut);
  pthread_mutex_unlock (mut);
}

void
noreturn (void)
{
  pthread_mutex_t mut;
  pthread_cond_t cond;

  pthread_mutex_init (&mut, NULL);
  pthread_cond_init (&cond, NULL);

  /* Wait for a condition that will never be signaled, so we effectively
     block the thread here.  */
  cond_wait (&cond, &mut);
}

void *
thread_entry (void *unused)
{
  incr_thread_count ();
  noreturn ();
}

void
sigabrt_handler (int signo)
{
  sigabrt_received = 1;
}

/* Helper to test a hand-call being "interrupted" by a signal on another
   thread.  */

void
hand_call_with_signal (void)
{
  const struct timespec ts = { 0, 10000000 }; /* 0.01 sec */

  sigabrt_received = 0;
  pthread_kill (threads[0], SIGABRT);
  while (! sigabrt_received)
    nanosleep (&ts, NULL);
}

/* Wait until all threads are running.  */

void
wait_all_threads_running (void)
{
  pthread_mutex_lock (&thread_count_mutex);
  if (thread_count == NR_THREADS)
    {
      pthread_mutex_unlock (&thread_count_mutex);
      return;
    }
  pthread_cond_wait (&thread_count_condvar, &thread_count_mutex);
  if (thread_count == NR_THREADS)
    {
      pthread_mutex_unlock (&thread_count_mutex);
      return;
    }
  pthread_mutex_unlock (&thread_count_mutex);
  printf ("failed waiting for all threads to start\n");
  abort ();
}

/* Called when all threads are running.
   Easy place for a breakpoint.  */

void
all_threads_running (void)
{
}

int
main (void)
{
  int i;

  signal (SIGABRT, sigabrt_handler);

  pthread_mutex_init (&thread_count_mutex, NULL);
  pthread_cond_init (&thread_count_condvar, NULL);

  for (i = 0; i < NR_THREADS; ++i)
    pthread_create (&threads[i], NULL, thread_entry, NULL);

  wait_all_threads_running ();
  all_threads_running ();

  return 0;
}