summary refs log tree commit diff stats
path: root/libotr/libgpg-error-1.42/tests/t-lock.c
blob: 6add18b8ca93e61add4aaf74758cd35910c76c13 (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
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
/* t-lock.c - Check the lock functions
 * Copyright (C) 2013, 2015 g10 Code GmbH
 *
 * This file is part of libgpg-error.
 *
 * libgpg-error 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.
 *
 * libgpg-error 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 this program; if not, see <https://www.gnu.org/licenses/>.
 */

#if HAVE_CONFIG_H
# include <config.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <sys/types.h>
#include <unistd.h>
#ifdef _WIN32
# include <windows.h>
# include <time.h>
#else
# ifdef USE_POSIX_THREADS
#  include <pthread.h>
# endif
#endif

#define PGM "t-lock"

#include "t-common.h"

#ifdef _WIN32
# define THREAD_RET_TYPE  DWORD WINAPI
# define THREAD_RET_VALUE 0
#else
# define THREAD_RET_TYPE  void *
# define THREAD_RET_VALUE NULL
#endif


/* Our tests works by having a a couple of accountant threads which do
   random transactions between accounts and a revision threads which
   checks that the balance of all accounts is invariant.  The idea for
   this check is due to Bruno Haible.  */
#define N_ACCOUNT 8
#define ACCOUNT_VALUE 42
static int account[N_ACCOUNT];
GPGRT_LOCK_DEFINE (accounts_lock);

/* Number of transactions done by each accountant.  */
#define N_TRANSACTIONS 1000

/* Number of accountants to run.  */
#define N_ACCOUNTANTS 5

/* Maximum transaction value.  A quite low value is used so that we
   would get an integer overflow.  */
#define MAX_TRANSACTION_VALUE 50

/* Flag to tell the revision thread to finish.  */
static volatile int stop_revision_thread;


/* Initialze all accounts.  */
static void
init_accounts (void)
{
  int i;

  for (i=0; i < N_ACCOUNT; i++)
    account[i] = ACCOUNT_VALUE;
}


/* Check that the sum of all accounts matches the initial sum.  */
static void
check_accounts (void)
{
  int i, sum;

  sum = 0;
  for (i = 0; i < N_ACCOUNT; i++)
    sum += account[i];
  if (sum != N_ACCOUNT * ACCOUNT_VALUE)
    die ("accounts out of balance");
}


static void
print_accounts (void)
{
  int i;

  for (i=0; i < N_ACCOUNT; i++)
    printf ("account %d: %6d\n", i, account[i]);
}


#if defined(_WIN32) || defined(USE_POSIX_THREADS)
/* Get a a random integer value in the range 0 to HIGH.  */
static unsigned int
get_rand (int high)
{
  return (unsigned int)(1+(int)((double)(high+1)*rand ()/(RAND_MAX+1.0))) - 1;
}


/* Pick a random account.  Note that this function is not
   thread-safe. */
static int
pick_account (void)
{
  return get_rand (N_ACCOUNT - 1);
}


/* Pick a random value for a transaction.  This is not thread-safe.  */
static int
pick_value (void)
{
  return get_rand (MAX_TRANSACTION_VALUE);
}


/* This is the revision department.  */
static THREAD_RET_TYPE
revision_thread (void *arg)
{
  gpg_err_code_t rc;
  int i = 0;

  (void)arg;

  while (!stop_revision_thread)
    {
      rc = gpgrt_lock_lock (&accounts_lock);
      if (rc)
        fail ("gpgrt_lock_lock failed at %d: %s", __LINE__, gpg_strerror (rc));

      check_accounts ();
      rc = gpgrt_lock_unlock (&accounts_lock);
      if (rc)
        fail ("gpgrt_lock_unlock failed at %d: %s", __LINE__,gpg_strerror (rc));
      if (!(++i%7))
        gpgrt_yield ();
    }
  return THREAD_RET_VALUE;
}


/* This is one of our accountants.  */
static THREAD_RET_TYPE
accountant_thread (void *arg)
{
  gpg_err_code_t rc;
  int i;
  int acc1, acc2;
  int value;

  (void)arg;

#ifdef _WIN32
  srand (time(NULL)*getpid());  /* Windows needs it per thread.  */
#endif
  for (i = 0; i < N_TRANSACTIONS; i++)
    {
      rc = gpgrt_lock_lock (&accounts_lock);
      if (rc)
        fail ("gpgrt_lock_lock failed at %d: %s", __LINE__, gpg_strerror (rc));

      acc1 = pick_account ();
      acc2 = pick_account ();
      value = pick_value ();
      account[acc1] += value;
      account[acc2] -= value;

      rc = gpgrt_lock_unlock (&accounts_lock);
      if (rc)
        fail ("gpgrt_lock_unlock failed at %d: %s", __LINE__,gpg_strerror (rc));
      if (i && !(i%8))
        gpgrt_yield ();
    }
  return THREAD_RET_VALUE;
}
#endif /*_WIN32||USE_POSIX_THREADS*/


static void
run_test (void)
{
#ifdef _WIN32
  HANDLE rthread;
  HANDLE athreads[N_ACCOUNTANTS];
  int i;
  int rc;

  stop_revision_thread = 0;
  rthread = CreateThread (NULL, 0, revision_thread, NULL, 0, NULL);
  if (!rthread)
    die ("error creating revision thread: rc=%d", (int)GetLastError ());

  for (i=0; i < N_ACCOUNTANTS; i++)
    {
      athreads[i] = CreateThread (NULL, 0, accountant_thread, NULL, 0, NULL);
      if (!athreads[i])
        die ("error creating accountant thread %d: rc=%d",
             i, (int)GetLastError ());
    }

  for (i=0; i < N_ACCOUNTANTS; i++)
    {
      rc = WaitForSingleObject (athreads[i], INFINITE);
      if (rc == WAIT_OBJECT_0)
        show ("accountant thread %d has terminated", i);
      else
        fail ("waiting for accountant thread %d failed: %d",
              i, (int)GetLastError ());
      CloseHandle (athreads[i]);
    }
  stop_revision_thread = 1;

  rc = WaitForSingleObject (rthread, INFINITE);
  if (rc == WAIT_OBJECT_0)
    show ("revision thread has terminated");
  else
    fail ("waiting for revision thread failed: %d", (int)GetLastError ());
  CloseHandle (rthread);

#else /*!_WIN32*/
# ifdef USE_POSIX_THREADS
  pthread_t rthread;
  pthread_t athreads[N_ACCOUNTANTS];
  int i;

  stop_revision_thread = 0;
  pthread_create (&rthread, NULL, revision_thread, NULL);

  for (i=0; i < N_ACCOUNTANTS; i++)
    pthread_create (&athreads[i], NULL, accountant_thread, NULL);

  for (i=0; i < N_ACCOUNTANTS; i++)
    {
      pthread_join (athreads[i], NULL);
      show ("accountant thread %d has terminated", i);
    }

  stop_revision_thread = 1;
  pthread_join (rthread, NULL);
  show ("revision thread has terminated");
# else /*!USE_POSIX_THREADS*/
  verbose++;
  show ("no thread support - skipping test\n", PGM);
  verbose--;
# endif /*!USE_POSIX_THREADS*/
#endif /*!_WIN32*/

  gpgrt_lock_destroy (&accounts_lock);
}


int
main (int argc, char **argv)
{
  int last_argc = -1;
  int rc;

  if (argc)
    {
      argc--; argv++;
    }
  while (argc && last_argc != argc )
    {
      last_argc = argc;
      if (!strcmp (*argv, "--help"))
        {
          puts (
"usage: ./t-lock [options]\n"
"\n"
"Options:\n"
"  --verbose      Show what is going on\n"
"  --debug        Flyswatter\n"
);
          exit (0);
        }
      if (!strcmp (*argv, "--verbose"))
        {
          verbose = 1;
          argc--; argv++;
        }
      else if (!strcmp (*argv, "--debug"))
        {
          verbose = debug = 1;
          argc--; argv++;
        }
    }

  srand (time(NULL)*getpid());

  if (!gpg_error_check_version (GPG_ERROR_VERSION))
    {
      die ("gpg_error_check_version returned an error");
      errorcount++;
    }

  init_accounts ();
  check_accounts ();
  run_test ();
  check_accounts ();
  /* Run a second time to check deinit code.  */
  run_test ();
  check_accounts ();
  /* And a third time to test an explicit init.  */
  rc = gpgrt_lock_init (&accounts_lock);
  if (rc)
    fail ("gpgrt_lock_init failed at %d: %s", __LINE__, gpg_strerror (rc));
  run_test ();
  check_accounts ();
  if (verbose)
    print_accounts ();

  return errorcount ? 1 : 0;
}