1/*	$NetBSD: pthread_attr.c,v 1.14 2010/08/06 14:23:06 christos Exp $	*/
2
3/*-
4 * Copyright (c) 2001, 2002, 2003, 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Nathan J. Williams.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__RCSID("$NetBSD: pthread_attr.c,v 1.14 2010/08/06 14:23:06 christos Exp $");
34
35#include <errno.h>
36#include <stdio.h>
37#include <stdlib.h>
38#include <string.h>
39#include <unistd.h>
40
41#ifndef __lint__
42#define pthread_attr_get_np _pthread_attr_get_np
43#endif
44
45#include "pthread.h"
46#include "pthread_int.h"
47
48__weak_alias(pthread_attr_get_np, _pthread_attr_get_np)
49
50static struct pthread_attr_private *pthread__attr_init_private(
51    pthread_attr_t *);
52
53static struct pthread_attr_private *
54pthread__attr_init_private(pthread_attr_t *attr)
55{
56	struct pthread_attr_private *p;
57
58	if ((p = attr->pta_private) != NULL)
59		return p;
60
61	p = malloc(sizeof(*p));
62	if (p != NULL) {
63		memset(p, 0, sizeof(*p));
64		attr->pta_private = p;
65		p->ptap_policy = SCHED_OTHER;
66	}
67	return p;
68}
69
70
71int
72pthread_attr_init(pthread_attr_t *attr)
73{
74
75	attr->pta_magic = PT_ATTR_MAGIC;
76	attr->pta_flags = 0;
77	attr->pta_private = NULL;
78
79	return 0;
80}
81
82
83int
84pthread_attr_destroy(pthread_attr_t *attr)
85{
86	struct pthread_attr_private *p;
87
88	if ((p = attr->pta_private) != NULL)
89		free(p);
90
91	return 0;
92}
93
94
95int
96pthread_attr_get_np(pthread_t thread, pthread_attr_t *attr)
97{
98	struct pthread_attr_private *p;
99
100	p = pthread__attr_init_private(attr);
101	if (p == NULL)
102		return ENOMEM;
103
104	attr->pta_flags = thread->pt_flags &
105	    (PT_FLAG_DETACHED | PT_FLAG_SCOPE_SYSTEM | PT_FLAG_EXPLICIT_SCHED);
106
107	p->ptap_namearg = thread->pt_name;
108	p->ptap_stackaddr = thread->pt_stack.ss_sp;
109	p->ptap_stacksize = thread->pt_stack.ss_size;
110	p->ptap_guardsize = (size_t)sysconf(_SC_PAGESIZE);
111	return pthread_getschedparam(thread, &p->ptap_policy, &p->ptap_sp);
112}
113
114
115int
116pthread_attr_getdetachstate(const pthread_attr_t *attr, int *detachstate)
117{
118
119	if (attr->pta_flags & PT_FLAG_DETACHED)
120		*detachstate = PTHREAD_CREATE_DETACHED;
121	else
122		*detachstate = PTHREAD_CREATE_JOINABLE;
123
124	return 0;
125}
126
127
128int
129pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate)
130{
131
132	switch (detachstate) {
133	case PTHREAD_CREATE_JOINABLE:
134		attr->pta_flags &= ~PT_FLAG_DETACHED;
135		break;
136	case PTHREAD_CREATE_DETACHED:
137		attr->pta_flags |= PT_FLAG_DETACHED;
138		break;
139	default:
140		return EINVAL;
141	}
142
143	return 0;
144}
145
146
147int
148pthread_attr_getguardsize(const pthread_attr_t *attr, size_t *guard)
149{
150	struct pthread_attr_private *p;
151
152	if ((p = attr->pta_private) == NULL)
153		*guard = (size_t)sysconf(_SC_PAGESIZE);
154	else
155		*guard = p->ptap_guardsize;
156
157	return 0;
158}
159
160
161int
162pthread_attr_setguardsize(pthread_attr_t *attr, size_t guard)
163{
164	struct pthread_attr_private *p;
165
166	p = pthread__attr_init_private(attr);
167	if (p == NULL)
168		return ENOMEM;
169
170	p->ptap_guardsize = guard;
171
172	return 0;
173}
174
175
176int
177pthread_attr_getinheritsched(const pthread_attr_t *attr, int *inherit)
178{
179
180	if (attr->pta_flags & PT_FLAG_EXPLICIT_SCHED)
181		*inherit = PTHREAD_EXPLICIT_SCHED;
182	else
183		*inherit = PTHREAD_INHERIT_SCHED;
184
185	return 0;
186}
187
188
189int
190pthread_attr_setinheritsched(pthread_attr_t *attr, int inherit)
191{
192
193	switch (inherit) {
194	case PTHREAD_INHERIT_SCHED:
195		attr->pta_flags &= ~PT_FLAG_EXPLICIT_SCHED;
196		break;
197	case PTHREAD_EXPLICIT_SCHED:
198		attr->pta_flags |= PT_FLAG_EXPLICIT_SCHED;
199		break;
200	default:
201		return EINVAL;
202	}
203
204	return 0;
205}
206
207
208int
209pthread_attr_getscope(const pthread_attr_t *attr, int *scope)
210{
211
212	if (attr->pta_flags & PT_FLAG_SCOPE_SYSTEM)
213		*scope = PTHREAD_SCOPE_SYSTEM;
214	else
215		*scope = PTHREAD_SCOPE_PROCESS;
216
217	return 0;
218}
219
220
221int
222pthread_attr_setscope(pthread_attr_t *attr, int scope)
223{
224
225	switch (scope) {
226	case PTHREAD_SCOPE_PROCESS:
227		attr->pta_flags &= ~PT_FLAG_SCOPE_SYSTEM;
228		break;
229	case PTHREAD_SCOPE_SYSTEM:
230		attr->pta_flags |= PT_FLAG_SCOPE_SYSTEM;
231		break;
232	default:
233		return EINVAL;
234	}
235
236	return 0;
237}
238
239
240int
241pthread_attr_setschedparam(pthread_attr_t *attr,
242			   const struct sched_param *param)
243{
244	struct pthread_attr_private *p;
245	int error;
246
247	if (param == NULL)
248		return EINVAL;
249	p = pthread__attr_init_private(attr);
250	if (p == NULL)
251		return ENOMEM;
252	error = pthread__checkpri(param->sched_priority);
253	if (error == 0)
254		p->ptap_sp = *param;
255	return error;
256}
257
258
259int
260pthread_attr_getschedparam(const pthread_attr_t *attr,
261			   struct sched_param *param)
262{
263	struct pthread_attr_private *p;
264
265	if (param == NULL)
266		return EINVAL;
267	p = attr->pta_private;
268	if (p == NULL)
269		memset(param, 0, sizeof(*param));
270	else
271		*param = p->ptap_sp;
272	return 0;
273}
274
275
276int
277pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy)
278{
279	struct pthread_attr_private *p;
280
281
282	switch (policy) {
283	case SCHED_OTHER:
284	case SCHED_FIFO:
285	case SCHED_RR:
286		p = pthread__attr_init_private(attr);
287		if (p == NULL)
288			return ENOMEM;
289		p->ptap_policy = policy;
290		return 0;
291	default:
292		return ENOTSUP;
293	}
294}
295
296
297int
298pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy)
299{
300	struct pthread_attr_private *p;
301
302	p = attr->pta_private;
303	if (p == NULL) {
304		*policy = SCHED_OTHER;
305		return 0;
306	}
307	*policy = p->ptap_policy;
308	return 0;
309}
310
311
312int
313pthread_attr_getstack(const pthread_attr_t *attr, void **addr, size_t *size)
314{
315	struct pthread_attr_private *p;
316
317	if ((p = attr->pta_private) == NULL) {
318		*addr = NULL;
319		*size = pthread__stacksize;
320	} else {
321		*addr = p->ptap_stackaddr;
322		*size = p->ptap_stacksize;
323	}
324
325	return 0;
326}
327
328
329int
330pthread_attr_setstack(pthread_attr_t *attr, void *addr, size_t size)
331{
332	struct pthread_attr_private *p;
333
334	p = pthread__attr_init_private(attr);
335	if (p == NULL)
336		return ENOMEM;
337
338	p->ptap_stackaddr = addr;
339	p->ptap_stacksize = size;
340
341	return 0;
342}
343
344
345int
346pthread_attr_getstacksize(const pthread_attr_t *attr, size_t *size)
347{
348	struct pthread_attr_private *p;
349
350	if ((p = attr->pta_private) == NULL)
351		*size = pthread__stacksize;
352	else
353		*size = p->ptap_stacksize;
354
355	return 0;
356}
357
358
359int
360pthread_attr_setstacksize(pthread_attr_t *attr, size_t size)
361{
362	struct pthread_attr_private *p;
363
364	if (size < (size_t)sysconf(_SC_THREAD_STACK_MIN))
365		return EINVAL;
366
367	p = pthread__attr_init_private(attr);
368	if (p == NULL)
369		return ENOMEM;
370
371	p->ptap_stacksize = size;
372
373	return 0;
374}
375
376
377int
378pthread_attr_getstackaddr(const pthread_attr_t *attr, void **addr)
379{
380	struct pthread_attr_private *p;
381
382	if ((p = attr->pta_private) == NULL)
383		*addr = NULL;
384	else
385		*addr = p->ptap_stackaddr;
386
387	return 0;
388}
389
390
391int
392pthread_attr_setstackaddr(pthread_attr_t *attr, void *addr)
393{
394	struct pthread_attr_private *p;
395
396	p = pthread__attr_init_private(attr);
397	if (p == NULL)
398		return ENOMEM;
399
400	p->ptap_stackaddr = addr;
401
402	return 0;
403}
404
405
406int
407pthread_attr_getname_np(const pthread_attr_t *attr, char *name, size_t len,
408    void **argp)
409{
410	struct pthread_attr_private *p;
411
412	if ((p = attr->pta_private) == NULL) {
413		name[0] = '\0';
414		if (argp != NULL)
415			*argp = NULL;
416	} else {
417		strlcpy(name, p->ptap_name, len);
418		if (argp != NULL)
419			*argp = p->ptap_namearg;
420	}
421
422	return 0;
423}
424
425
426int
427pthread_attr_setname_np(pthread_attr_t *attr, const char *name, void *arg)
428{
429	struct pthread_attr_private *p;
430	int namelen;
431
432	p = pthread__attr_init_private(attr);
433	if (p == NULL)
434		return ENOMEM;
435
436	namelen = snprintf(p->ptap_name, PTHREAD_MAX_NAMELEN_NP, name, arg);
437	if (namelen >= PTHREAD_MAX_NAMELEN_NP) {
438		p->ptap_name[0] = '\0';
439		return EINVAL;
440	}
441	p->ptap_namearg = arg;
442
443	return 0;
444}
445
446int
447pthread_attr_setcreatesuspend_np(pthread_attr_t *attr)
448{
449	attr->pta_flags |= PT_FLAG_SUSPENDED;
450	return 0;
451}
452
453int
454pthread_getattr_np(pthread_t thread, pthread_attr_t *attr)
455{
456	int error;
457	if ((error = pthread_attr_init(attr)) != 0)
458		return error;
459	if ((error = pthread_attr_get_np(thread, attr)) != 0) {
460		(void)pthread_attr_destroy(attr);
461		return error;
462	}
463	return 0;
464}
465