File: tst-default-attr.c

package info (click to toggle)
glibc 2.19-18+deb8u7
  • links: PTS, VCS
  • area: main
  • in suites: jessie-backports
  • size: 204,748 kB
  • sloc: ansic: 970,427; asm: 241,207; sh: 10,069; makefile: 8,476; cpp: 3,595; perl: 2,077; pascal: 1,839; awk: 1,704; yacc: 317; sed: 73
file content (385 lines) | stat: -rw-r--r-- 9,429 bytes parent folder | download | duplicates (26)
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
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
/* Verify that pthread_[gs]etattr_default_np work correctly.

   Copyright (C) 2013 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   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 <pthread.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <stdbool.h>

#define RETURN_IF_FAIL(f, ...) \
  ({									      \
    int ret = f (__VA_ARGS__);						      \
    if (ret != 0)							      \
      {									      \
	printf ("%s:%d: %s returned %d (errno = %d)\n", __FILE__, __LINE__,   \
		#f, ret, errno);					      \
	return ret;							      \
      }									      \
  })

static int (*verify_result) (pthread_attr_t *);
static size_t stacksize = 1024 * 1024;
static size_t guardsize;
static bool do_join = true;
static int running = 0;
static int detach_failed = 0;
static pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t c = PTHREAD_COND_INITIALIZER;

static void *
thr (void *unused __attribute__ ((unused)))
{
  pthread_attr_t attr;
  int ret;

  memset (&attr, 0xab, sizeof attr);
  /* To verify that the pthread_setattr_default_np worked.  */
  if ((ret = pthread_getattr_default_np (&attr)) != 0)
    {
      printf ("pthread_getattr_default_np failed: %s\n", strerror (ret));
      goto out;
    }

  if ((ret = (*verify_result) (&attr)) != 0)
    goto out;

  memset (&attr, 0xab, sizeof attr);
  /* To verify that the attributes actually got applied.  */
  if ((ret = pthread_getattr_np (pthread_self (), &attr)) != 0)
    {
      printf ("pthread_getattr_default_np failed: %s\n", strerror (ret));
      goto out;
    }

  ret = (*verify_result) (&attr);

out:
  if (!do_join)
    {
      pthread_mutex_lock (&m);
      running--;
      pthread_cond_signal (&c);
      pthread_mutex_unlock (&m);

      detach_failed |= ret;
    }

  return (void *) (uintptr_t) ret;
}

static int
run_threads (const pthread_attr_t *attr)
{
  pthread_t t;
  void *tret = NULL;

  RETURN_IF_FAIL (pthread_setattr_default_np, attr);

  /* Run twice to ensure that the attributes do not get overwritten in the
     first run somehow.  */
  for (int i = 0; i < 2; i++)
    {
      RETURN_IF_FAIL (pthread_create, &t, NULL, thr, NULL);
      if (do_join)
	RETURN_IF_FAIL (pthread_join, t, &tret);
      else
	{
	  pthread_mutex_lock (&m);
	  running++;
	  pthread_mutex_unlock (&m);
	}

      if (tret != NULL)
	{
	  puts ("Thread failed");
	  return 1;
	}
    }

  /* Stay in sync for detached threads and get their status.  */
  while (!do_join)
    {
      pthread_mutex_lock (&m);
      if (running == 0)
	{
	  pthread_mutex_unlock (&m);
	  break;
	}
      pthread_cond_wait (&c, &m);
      pthread_mutex_unlock (&m);
    }

  return 0;
}

static int
verify_detach_result (pthread_attr_t *attr)
{
  int state;

  RETURN_IF_FAIL (pthread_attr_getdetachstate, attr, &state);

  if (state != PTHREAD_CREATE_DETACHED)
    {
      puts ("failed to set detach state");
      return 1;
    }

  return 0;
}

static int
do_detach_test (void)
{
  pthread_attr_t attr;

  do_join = false;
  RETURN_IF_FAIL (pthread_attr_init, &attr);
  RETURN_IF_FAIL (pthread_attr_setdetachstate, &attr, PTHREAD_CREATE_DETACHED);

  RETURN_IF_FAIL (run_threads, &attr);
  return detach_failed;
}

static int
verify_affinity_result (pthread_attr_t *attr)
{
  cpu_set_t cpuset;

  RETURN_IF_FAIL (pthread_attr_getaffinity_np, attr, sizeof (cpuset), &cpuset);
  if (!CPU_ISSET (0, &cpuset))
    {
      puts ("failed to set cpu affinity");
      return 1;
    }

  return 0;
}

static int
do_affinity_test (void)
{
  pthread_attr_t attr;

  RETURN_IF_FAIL (pthread_attr_init, &attr);

  /* Processor affinity.  Like scheduling policy, this could fail if the user
     does not have the necessary privileges.  So we only spew a warning if
     pthread_create fails with EPERM.  A computer has at least one CPU.  */
  cpu_set_t cpuset;
  CPU_ZERO (&cpuset);
  CPU_SET (0, &cpuset);
  RETURN_IF_FAIL (pthread_attr_setaffinity_np, &attr, sizeof (cpuset), &cpuset);

  int ret = run_threads (&attr);

  if (ret == EPERM)
    {
      printf ("Skipping CPU Affinity test: %s\n", strerror (ret));
      return 0;
    }
  else if (ret != 0)
    return ret;

  return 0;
}

static int
verify_sched_result (pthread_attr_t *attr)
{
  int inherited, policy;
  struct sched_param param;

  RETURN_IF_FAIL (pthread_attr_getinheritsched, attr, &inherited);
  if (inherited != PTHREAD_EXPLICIT_SCHED)
    {
      puts ("failed to set EXPLICIT_SCHED (%d != %d)");
      return 1;
    }

  RETURN_IF_FAIL (pthread_attr_getschedpolicy, attr, &policy);
  if (policy != SCHED_RR)
    {
      printf ("failed to set SCHED_RR (%d != %d)\n", policy, SCHED_RR);
      return 1;
    }

  RETURN_IF_FAIL (pthread_attr_getschedparam, attr, &param);
  if (param.sched_priority != 42)
    {
      printf ("failed to set sched_priority (%d != %d)\n",
	      param.sched_priority, 42);
      return 1;
    }

  return 0;
}

static int
do_sched_test (void)
{
  pthread_attr_t attr;

  RETURN_IF_FAIL (pthread_attr_init, &attr);

  /* Scheduling policy.  Note that we don't always test these since it's
     possible that the user the tests run as don't have the appropriate
     privileges.  */
  RETURN_IF_FAIL (pthread_attr_setinheritsched, &attr, PTHREAD_EXPLICIT_SCHED);
  RETURN_IF_FAIL (pthread_attr_setschedpolicy, &attr, SCHED_RR);

  struct sched_param param;
  param.sched_priority = 42;
  RETURN_IF_FAIL (pthread_attr_setschedparam, &attr, &param);

  int ret = run_threads (&attr);

  if (ret == EPERM)
    {
      printf ("Skipping Scheduler Attributes test: %s\n", strerror (ret));
      return 0;
    }
  else if (ret != 0)
    return ret;

  return 0;
}

static int
verify_guardsize_result (pthread_attr_t *attr)
{
  size_t guard;

  RETURN_IF_FAIL (pthread_attr_getguardsize, attr, &guard);

  if (guardsize != guard)
    {
      printf ("failed to set guardsize (%zu, %zu)\n", guardsize, guard);
      return 1;
    }

  return 0;
}

static int
do_guardsize_test (void)
{
  long int pagesize = sysconf (_SC_PAGESIZE);
  pthread_attr_t attr;

  if (pagesize < 0)
    {
      printf ("sysconf failed: %s\n", strerror (errno));
      return 1;
    }

  RETURN_IF_FAIL (pthread_getattr_default_np, &attr);

  /* Increase default guardsize by a page.  */
  RETURN_IF_FAIL (pthread_attr_getguardsize, &attr, &guardsize);
  guardsize += pagesize;
  RETURN_IF_FAIL (pthread_attr_setguardsize, &attr, guardsize);
  RETURN_IF_FAIL (run_threads, &attr);

  return 0;
}

static int
verify_stacksize_result (pthread_attr_t *attr)
{
  size_t stack;

  RETURN_IF_FAIL (pthread_attr_getstacksize, attr, &stack);

  if (stacksize != stack)
    {
      printf ("failed to set default stacksize (%zu, %zu)\n", stacksize, stack);
      return 1;
    }

  return 0;
}

static int
do_stacksize_test (void)
{
  long int pagesize = sysconf (_SC_PAGESIZE);
  pthread_attr_t attr;

  if (pagesize < 0)
    {
      printf ("sysconf failed: %s\n", strerror (errno));
      return 1;
    }

  /* Perturb the size by a page so that we're not aligned on the 64K boundary.
     pthread_create does this perturbation on x86 to avoid causing the 64k
     aliasing conflict.  We want to prevent pthread_create from doing that
     since it is not consistent for all architectures.  */
  stacksize += pagesize;

  RETURN_IF_FAIL (pthread_attr_init, &attr);

  /* Run twice to ensure that we don't give a false positive.  */
  RETURN_IF_FAIL (pthread_attr_setstacksize, &attr, stacksize);
  RETURN_IF_FAIL (run_threads, &attr);
  stacksize *= 2;
  RETURN_IF_FAIL (pthread_attr_setstacksize, &attr, stacksize);
  RETURN_IF_FAIL (run_threads, &attr);
  return 0;
}

/* We test each attribute separately because sched and affinity tests may need
   additional user privileges that may not be available during the test run.
   Each attribute test is a set of two functions, viz. a function to set the
   default attribute (do_foo_test) and another to verify its result
   (verify_foo_result).  Each test spawns a thread and checks (1) if the
   attribute values were applied correctly and (2) if the change in the default
   value reflected.  */
static int
do_test (void)
{
  puts ("stacksize test");
  verify_result = verify_stacksize_result;
  RETURN_IF_FAIL (do_stacksize_test);

  puts ("guardsize test");
  verify_result = verify_guardsize_result;
  RETURN_IF_FAIL (do_guardsize_test);

  puts ("sched test");
  verify_result = verify_sched_result;
  RETURN_IF_FAIL (do_sched_test);

  puts ("affinity test");
  verify_result = verify_affinity_result;
  RETURN_IF_FAIL (do_affinity_test);

  puts ("detach test");
  verify_result = verify_detach_result;
  RETURN_IF_FAIL (do_detach_test);

  return 0;
}

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