summaryrefslogtreecommitdiff
path: root/linuxthreads/attr.c
blob: 2adc7ccd7a87d59fec125c023bdc6b1b1f68af3d (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
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
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
/* Linuxthreads - a simple clone()-based implementation of Posix        */
/* threads for Linux.                                                   */
/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr)              */
/*                                                                      */
/* This program is free software; you can redistribute it and/or        */
/* modify it under the terms of the GNU Library General Public License  */
/* as published by the Free Software Foundation; either version 2       */
/* 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 Library General Public License for more details.                 */

/* Handling of thread attributes */

#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/resource.h>
#include "pthread.h"
#include "internals.h"
#include <shlib-compat.h>
#include <ldsodefs.h>


int __pthread_attr_init_2_1(pthread_attr_t *attr)
{
  size_t ps = __getpagesize ();

  attr->__detachstate = PTHREAD_CREATE_JOINABLE;
  attr->__schedpolicy = SCHED_OTHER;
  attr->__schedparam.sched_priority = 0;
  attr->__inheritsched = PTHREAD_EXPLICIT_SCHED;
  attr->__scope = PTHREAD_SCOPE_SYSTEM;
#ifdef NEED_SEPARATE_REGISTER_STACK
  attr->__guardsize = ps + ps;
#else
  attr->__guardsize = ps;
#endif
  attr->__stackaddr = NULL;
  attr->__stackaddr_set = 0;
  attr->__stacksize = STACK_SIZE - ps;
  return 0;
}

versioned_symbol (libpthread, __pthread_attr_init_2_1, pthread_attr_init,
		  GLIBC_2_1);

#if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1)
int __pthread_attr_init_2_0(pthread_attr_t *attr)
{
  attr->__detachstate = PTHREAD_CREATE_JOINABLE;
  attr->__schedpolicy = SCHED_OTHER;
  attr->__schedparam.sched_priority = 0;
  attr->__inheritsched = PTHREAD_EXPLICIT_SCHED;
  attr->__scope = PTHREAD_SCOPE_SYSTEM;
  return 0;
}
compat_symbol (libpthread, __pthread_attr_init_2_0, pthread_attr_init,
	       GLIBC_2_0);
#endif

int __pthread_attr_destroy(pthread_attr_t *attr)
{
  return 0;
}
strong_alias (__pthread_attr_destroy, pthread_attr_destroy);

int __pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate)
{
  if (detachstate < PTHREAD_CREATE_JOINABLE ||
      detachstate > PTHREAD_CREATE_DETACHED)
    return EINVAL;
  attr->__detachstate = detachstate;
  return 0;
}
strong_alias (__pthread_attr_setdetachstate, pthread_attr_setdetachstate);

int __pthread_attr_getdetachstate(const pthread_attr_t *attr, int *detachstate)
{
  *detachstate = attr->__detachstate;
  return 0;
}
strong_alias (__pthread_attr_getdetachstate, pthread_attr_getdetachstate);

int __pthread_attr_setschedparam(pthread_attr_t *attr,
                                 const struct sched_param *param)
{
  int max_prio = __sched_get_priority_max(attr->__schedpolicy);
  int min_prio = __sched_get_priority_min(attr->__schedpolicy);

  if (param->sched_priority < min_prio || param->sched_priority > max_prio)
    return EINVAL;
  memcpy (&attr->__schedparam, param, sizeof (struct sched_param));
  return 0;
}
strong_alias (__pthread_attr_setschedparam, pthread_attr_setschedparam);

int __pthread_attr_getschedparam(const pthread_attr_t *attr,
                                 struct sched_param *param)
{
  memcpy (param, &attr->__schedparam, sizeof (struct sched_param));
  return 0;
}
strong_alias (__pthread_attr_getschedparam, pthread_attr_getschedparam);

int __pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy)
{
  if (policy != SCHED_OTHER && policy != SCHED_FIFO && policy != SCHED_RR)
    return EINVAL;
  attr->__schedpolicy = policy;
  return 0;
}
strong_alias (__pthread_attr_setschedpolicy, pthread_attr_setschedpolicy);

int __pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy)
{
  *policy = attr->__schedpolicy;
  return 0;
}
strong_alias (__pthread_attr_getschedpolicy, pthread_attr_getschedpolicy);

int __pthread_attr_setinheritsched(pthread_attr_t *attr, int inherit)
{
  if (inherit != PTHREAD_INHERIT_SCHED && inherit != PTHREAD_EXPLICIT_SCHED)
    return EINVAL;
  attr->__inheritsched = inherit;
  return 0;
}
strong_alias (__pthread_attr_setinheritsched, pthread_attr_setinheritsched);

int __pthread_attr_getinheritsched(const pthread_attr_t *attr, int *inherit)
{
  *inherit = attr->__inheritsched;
  return 0;
}
strong_alias (__pthread_attr_getinheritsched, pthread_attr_getinheritsched);

int __pthread_attr_setscope(pthread_attr_t *attr, int scope)
{
  switch (scope) {
  case PTHREAD_SCOPE_SYSTEM:
    attr->__scope = scope;
    return 0;
  case PTHREAD_SCOPE_PROCESS:
    return ENOTSUP;
  default:
    return EINVAL;
  }
}
strong_alias (__pthread_attr_setscope, pthread_attr_setscope);

int __pthread_attr_getscope(const pthread_attr_t *attr, int *scope)
{
  *scope = attr->__scope;
  return 0;
}
strong_alias (__pthread_attr_getscope, pthread_attr_getscope);

int __pthread_attr_setguardsize(pthread_attr_t *attr, size_t guardsize)
{
  /* The guard size must not be larger than the stack itself */
  if (guardsize >= attr->__stacksize) return EINVAL;

  attr->__guardsize = guardsize;

  return 0;
}
weak_alias (__pthread_attr_setguardsize, pthread_attr_setguardsize)

int __pthread_attr_getguardsize(const pthread_attr_t *attr, size_t *guardsize)
{
  *guardsize = attr->__guardsize;
  return 0;
}
weak_alias (__pthread_attr_getguardsize, pthread_attr_getguardsize)

int __pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr)
{
  attr->__stackaddr = stackaddr;
  attr->__stackaddr_set = 1;
  return 0;
}
weak_alias (__pthread_attr_setstackaddr, pthread_attr_setstackaddr)

link_warning (pthread_attr_setstackaddr,
	      "the use of `pthread_attr_setstackaddr' is deprecated, use `pthread_attr_setstack'")

int __pthread_attr_getstackaddr(const pthread_attr_t *attr, void **stackaddr)
{
  /* XXX This function has a stupid definition.  The standard specifies
     no error value but what is if no stack address was set?  We simply
     return the value we have in the member.  */
  *stackaddr = attr->__stackaddr;
  return 0;
}
weak_alias (__pthread_attr_getstackaddr, pthread_attr_getstackaddr)

link_warning (pthread_attr_getstackaddr,
	      "the use of `pthread_attr_getstackaddr' is deprecated, use `pthread_attr_getstack'")


int __pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize)
{
#ifdef FLOATING_STACKS
  /* We have to check against the maximum allowed stack size.  This is no
     problem if the manager is already started and we determined it.  If
     this hasn't happened, we have to find the limit outself.  */
  if (__pthread_max_stacksize == 0)
    __pthread_init_max_stacksize ();

  if (stacksize > __pthread_max_stacksize)
    return EINVAL;
#else
  /* We have a fixed size limit.  */
  if (stacksize > STACK_SIZE)
    return EINVAL;
#endif

  /* We don't accept value smaller than PTHREAD_STACK_MIN.  */
  if (stacksize < PTHREAD_STACK_MIN)
    return EINVAL;

  attr->__stacksize = stacksize;
  return 0;
}

#if PTHREAD_STACK_MIN == 16384
weak_alias (__pthread_attr_setstacksize, pthread_attr_setstacksize)
#else
versioned_symbol (libpthread, __pthread_attr_setstacksize,
                  pthread_attr_setstacksize, GLIBC_2_3_3);

# if SHLIB_COMPAT(libpthread, GLIBC_2_1, GLIBC_2_3_3)

int __old_pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize)
{
#  ifdef FLOATING_STACKS
  /* We have to check against the maximum allowed stack size.  This is no
     problem if the manager is already started and we determined it.  If
     this hasn't happened, we have to find the limit outself.  */
  if (__pthread_max_stacksize == 0)
    __pthread_init_max_stacksize ();

  if (stacksize > __pthread_max_stacksize)
    return EINVAL;
#  else
  /* We have a fixed size limit.  */
  if (stacksize > STACK_SIZE)
    return EINVAL;
#  endif

  /* We don't accept value smaller than old PTHREAD_STACK_MIN.  */
  if (stacksize < 16384)
    return EINVAL;

  attr->__stacksize = stacksize;
  return 0;
}
compat_symbol (libpthread, __old_pthread_attr_setstacksize,
	       pthread_attr_setstacksize, GLIBC_2_1);
# endif
#endif


int __pthread_attr_getstacksize(const pthread_attr_t *attr, size_t *stacksize)
{
  *stacksize = attr->__stacksize;
  return 0;
}
weak_alias (__pthread_attr_getstacksize, pthread_attr_getstacksize)

int __pthread_attr_setstack (pthread_attr_t *attr, void *stackaddr,
			     size_t stacksize)
{
  int err;

  if ((((uintptr_t) stackaddr)
       & (__alignof__ (struct _pthread_descr_struct) - 1)) != 0)
    err = EINVAL;
  else
    err = __pthread_attr_setstacksize (attr, stacksize);
  if (err == 0)
    {
#ifndef _STACK_GROWS_UP
      attr->__stackaddr = (char *) stackaddr + stacksize;
#else
      attr->__stackaddr = stackaddr;
#endif
      attr->__stackaddr_set = 1;
    }

  return err;
}

#if PTHREAD_STACK_MIN == 16384
weak_alias (__pthread_attr_setstack, pthread_attr_setstack)
#else
versioned_symbol (libpthread, __pthread_attr_setstack, pthread_attr_setstack,
                  GLIBC_2_3_3);
# if SHLIB_COMPAT(libpthread, GLIBC_2_2, GLIBC_2_3_3)
int __old_pthread_attr_setstack (pthread_attr_t *attr, void *stackaddr,
				 size_t stacksize)
{
  int err;

  if ((((uintptr_t) stackaddr)
       & (__alignof__ (struct _pthread_descr_struct) - 1)) != 0)
    err = EINVAL;
  else
    err = __old_pthread_attr_setstacksize (attr, stacksize);
  if (err == 0)
    {
#  ifndef _STACK_GROWS_UP
      attr->__stackaddr = (char *) stackaddr + stacksize;
#  else
      attr->__stackaddr = stackaddr;
#  endif
      attr->__stackaddr_set = 1;
    }

  return err;
}

compat_symbol (libpthread, __old_pthread_attr_setstack, pthread_attr_setstack,
               GLIBC_2_2);

# endif
#endif

int __pthread_attr_getstack (const pthread_attr_t *attr, void **stackaddr,
			     size_t *stacksize)
{
  /* XXX This function has a stupid definition.  The standard specifies
     no error value but what is if no stack address was set?  We simply
     return the value we have in the member.  */
#ifndef _STACK_GROWS_UP
  *stackaddr = (char *) attr->__stackaddr - attr->__stacksize;
#else
  *stackaddr = attr->__stackaddr;
#endif
  *stacksize = attr->__stacksize;
  return 0;
}
weak_alias (__pthread_attr_getstack, pthread_attr_getstack)

int pthread_getattr_np (pthread_t thread, pthread_attr_t *attr)
{
  pthread_handle handle = thread_handle (thread);
  pthread_descr descr;
  int ret = 0;

  if (handle == NULL)
    return ENOENT;

  descr = handle->h_descr;

  attr->__detachstate = (descr->p_detached
			 ? PTHREAD_CREATE_DETACHED
			 : PTHREAD_CREATE_JOINABLE);

  attr->__schedpolicy = __sched_getscheduler (descr->p_pid);
  if (attr->__schedpolicy == -1)
    return errno;

  if (__sched_getparam (descr->p_pid,
			(struct sched_param *) &attr->__schedparam) != 0)
    return errno;

  attr->__inheritsched = descr->p_inheritsched;
  attr->__scope = PTHREAD_SCOPE_SYSTEM;

#ifdef _STACK_GROWS_DOWN
# ifdef USE_TLS
  attr->__stacksize = descr->p_stackaddr - (char *)descr->p_guardaddr
		      - descr->p_guardsize;
# else
  attr->__stacksize = (char *)(descr + 1) - (char *)descr->p_guardaddr
		      - descr->p_guardsize;
# endif
#else
# ifdef USE_TLS
  attr->__stacksize = (char *)descr->p_guardaddr - descr->p_stackaddr;
# else
  attr->__stacksize = (char *)descr->p_guardaddr - (char *)descr;
# endif
#endif
  attr->__guardsize = descr->p_guardsize;
  attr->__stackaddr_set = descr->p_userstack;
#ifdef NEED_SEPARATE_REGISTER_STACK
  if (descr->p_userstack == 0)
    attr->__stacksize *= 2;
  /* XXX This is awkward.  The guard pages are in the middle of the
     two stacks.  We must count the guard size in the stack size since
     otherwise the range of the stack area cannot be computed.  */
  attr->__stacksize += attr->__guardsize;
#endif
#ifdef USE_TLS
  attr->__stackaddr = descr->p_stackaddr;
#else
# ifndef _STACK_GROWS_UP
  attr->__stackaddr = (char *)(descr + 1);
# else
  attr->__stackaddr = (char *)descr;
# endif
#endif

#ifdef USE_TLS
  if (attr->__stackaddr == NULL)
#else
  if (descr == &__pthread_initial_thread)
#endif
    {
      /* Stack size limit.  */
      struct rlimit rl;

      /* The safest way to get the top of the stack is to read
	 /proc/self/maps and locate the line into which
	 __libc_stack_end falls.  */
      FILE *fp = fopen ("/proc/self/maps", "rc");
      if (fp == NULL)
	ret = errno;
      /* We need the limit of the stack in any case.  */
      else if (getrlimit (RLIMIT_STACK, &rl) != 0)
	ret = errno;
      else
	{
	  /* We need no locking.  */
	  __fsetlocking (fp, FSETLOCKING_BYCALLER);

	  /* Until we found an entry (which should always be the case)
	     mark the result as a failure.  */
	  ret = ENOENT;

	  char *line = NULL;
	  size_t linelen = 0;
	  uintptr_t last_to = 0;

	  while (! feof_unlocked (fp))
	    {
	      if (__getdelim (&line, &linelen, '\n', fp) <= 0)
		break;

	      uintptr_t from;
	      uintptr_t to;
	      if (sscanf (line, "%" SCNxPTR "-%" SCNxPTR, &from, &to) != 2)
		continue;
	      if (from <= (uintptr_t) __libc_stack_end
		  && (uintptr_t) __libc_stack_end < to)
		{
		  /* Found the entry.  Now we have the info we need.  */
		  attr->__stacksize = rl.rlim_cur;
#ifdef _STACK_GROWS_UP
		  /* Don't check to enforce a limit on the __stacksize */
		  attr->__stackaddr = (void *) from;
#else
		  attr->__stackaddr = (void *) to;

		  /* The limit might be too high.  */
		  if ((size_t) attr->__stacksize
		      > (size_t) attr->__stackaddr - last_to)
		    attr->__stacksize = (size_t) attr->__stackaddr - last_to;
#endif

		  /* We succeed and no need to look further.  */
		  ret = 0;
		  break;
		}
	      last_to = to;
	    }

	  fclose (fp);
	  free (line);
	}
    }

  return 0;

}