about summary refs log tree commit diff
path: root/nptl/tst-mutex4.c
blob: d8f30c6119b2fcec25b3b536c009b5915f0f2280 (plain) (blame)
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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
/* Copyright (C) 2002-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <pthread.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/wait.h>


static int
do_test (void)
{
  size_t ps = sysconf (_SC_PAGESIZE);
  char tmpfname[] = "/tmp/tst-mutex4.XXXXXX";
  char data[ps];
  void *mem;
  int fd;
  pthread_mutex_t *m;
  pthread_mutexattr_t a;
  pid_t pid;
  char *p;
  int err;
  int s;
  pthread_barrier_t *b;
  pthread_barrierattr_t ba;

  fd = mkstemp (tmpfname);
  if (fd == -1)
    {
      printf ("cannot open temporary file: %m\n");
      return 1;
    }

  /* Make sure it is always removed.  */
  unlink (tmpfname);

  /* Create one page of data.  */
  memset (data, '\0', ps);

  /* Write the data to the file.  */
  if (write (fd, data, ps) != (ssize_t) ps)
    {
      puts ("short write");
      return 1;
    }

  mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  if (mem == MAP_FAILED)
    {
      printf ("mmap failed: %m\n");
      return 1;
    }

  m = (pthread_mutex_t *) (((uintptr_t) mem + __alignof (pthread_mutex_t) - 1)
			   & ~(__alignof (pthread_mutex_t) - 1));
  b = (pthread_barrier_t *) (((uintptr_t) (m + 1)
			      + __alignof (pthread_barrier_t) - 1)
			     & ~(__alignof (pthread_barrier_t) - 1));
  p = (char *) (b + 1);

  if (pthread_mutexattr_init (&a) != 0)
    {
      puts ("mutexattr_init failed");
      return 1;
    }

  if (pthread_mutexattr_getpshared (&a, &s) != 0)
    {
      puts ("1st mutexattr_getpshared failed");
      return 1;
    }

  if (s != PTHREAD_PROCESS_PRIVATE)
    {
      puts ("default pshared value wrong");
      return 1;
    }

  if (pthread_mutexattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
    {
      puts ("mutexattr_setpshared failed");
      return 1;
    }

  if (pthread_mutexattr_getpshared (&a, &s) != 0)
    {
      puts ("2nd mutexattr_getpshared failed");
      return 1;
    }

  if (s != PTHREAD_PROCESS_SHARED)
    {
      puts ("pshared value after setpshared call wrong");
      return 1;
    }

#ifdef ENABLE_PI
  if (pthread_mutexattr_setprotocol (&a, PTHREAD_PRIO_INHERIT) != 0)
    {
      puts ("pthread_mutexattr_setprotocol failed");
      return 1;
    }
#endif

  if ((err = pthread_mutex_init (m, &a)) != 0)
    {
#ifdef ENABLE_PI
      if (err == ENOTSUP)
	{
	  puts ("PI mutexes unsupported");
	  return 0;
	}
#endif
      puts ("mutex_init failed");
      return 1;
    }

  if (pthread_mutex_lock (m) != 0)
    {
      puts ("mutex_lock failed");
      return 1;
    }

  if (pthread_mutexattr_destroy (&a) != 0)
    {
      puts ("mutexattr_destroy failed");
      return 1;
    }

  if (pthread_barrierattr_init (&ba) != 0)
    {
      puts ("barrierattr_init failed");
      return 1;
    }

  if (pthread_barrierattr_setpshared (&ba, PTHREAD_PROCESS_SHARED) != 0)
    {
      puts ("barrierattr_setpshared failed");
      return 1;
    }

  if (pthread_barrier_init (b, &ba, 2) != 0)
    {
      puts ("barrier_init failed");
      return 1;
    }

  if (pthread_barrierattr_destroy (&ba) != 0)
    {
      puts ("barrierattr_destroy failed");
      return 1;
    }

  err = pthread_mutex_trylock (m);
  if (err == 0)
    {
      puts ("mutex_trylock succeeded");
      return 1;
    }
  else if (err != EBUSY)
    {
      puts ("mutex_trylock didn't return EBUSY");
      return 1;
    }

  *p = 0;

  if (pthread_mutex_unlock (m) != 0)
    {
      puts ("parent: 1st mutex_unlock failed");
      return 1;
    }

  puts ("going to fork now");
  pid = fork ();
  if (pid == -1)
    {
      puts ("fork failed");
      return 1;
    }
  else if (pid == 0)
    {
      if (pthread_mutex_lock (m) != 0)
	{
	  puts ("child: mutex_lock failed");
	  return 1;
	}

      int e = pthread_barrier_wait (b);
      if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
	{
	  puts ("child: barrier_wait failed");
	  return 1;
	}

      if ((*p)++ != 0)
	{
	  puts ("child: *p != 0");
	  return 1;
	}

      if (pthread_mutex_unlock (m) != 0)
	{
	  puts ("child: mutex_unlock failed");
	  return 1;
	}

      puts ("child done");
    }
  else
    {
      int e = pthread_barrier_wait (b);
      if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
	{
	  puts ("parent: barrier_wait failed");
	  return 1;
	}

      if (pthread_mutex_lock (m) != 0)
	{
	  puts ("parent: 2nd mutex_lock failed");
	  return 1;
	}

      if (*p != 1)
	{
	  puts ("*p != 1");
	  return 1;
	}

      if (pthread_mutex_unlock (m) != 0)
	{
	  puts ("parent: 2nd mutex_unlock failed");
	  return 1;
	}

      if (pthread_mutex_destroy (m) != 0)
	{
	  puts ("mutex_destroy failed");
	  return 1;
	}

      if (pthread_barrier_destroy (b) != 0)
	{
	  puts ("barrier_destroy failed");
	  return 1;
	}

      puts ("parent done");
    }

  return 0;
}

#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"