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pthread_attr.c revision 1.10 
      1 /*	$NetBSD: pthread_attr.c,v 1.10 2008/06/28 10:29:37 ad 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 1.10 2008/06/28 10:29:37 ad Exp $");
     34 
     35 #include <errno.h>
     36 #include <stdio.h>
     37 #include <stdlib.h>
     38 #include <string.h>
     39 #include <unistd.h>
     40 
     41 #include "pthread.h"
     42 #include "pthread_int.h"
     43 
     44 static struct pthread_attr_private *pthread__attr_init_private(
     45     pthread_attr_t *);
     46 
     47 static struct pthread_attr_private *
     48 pthread__attr_init_private(pthread_attr_t *attr)
     49 {
     50 	struct pthread_attr_private *p;
     51 
     52 	if ((p = attr->pta_private) != NULL)
     53 		return p;
     54 
     55 	p = malloc(sizeof(*p));
     56 	if (p != NULL) {
     57 		memset(p, 0, sizeof(*p));
     58 		attr->pta_private = p;
     59 		p->ptap_policy = SCHED_OTHER;
     60 	}
     61 	return p;
     62 }
     63 
     64 
     65 int
     66 pthread_attr_init(pthread_attr_t *attr)
     67 {
     68 
     69 	attr->pta_magic = PT_ATTR_MAGIC;
     70 	attr->pta_flags = 0;
     71 	attr->pta_private = NULL;
     72 
     73 	return 0;
     74 }
     75 
     76 
     77 int
     78 pthread_attr_destroy(pthread_attr_t *attr)
     79 {
     80 	struct pthread_attr_private *p;
     81 
     82 	if ((p = attr->pta_private) != NULL)
     83 		free(p);
     84 
     85 	return 0;
     86 }
     87 
     88 
     89 int
     90 pthread_attr_get_np(pthread_t thread, pthread_attr_t *attr)
     91 {
     92 	struct pthread_attr_private *p;
     93 
     94 	p = pthread__attr_init_private(attr);
     95 	if (p == NULL)
     96 		return ENOMEM;
     97 
     98 	attr->pta_flags = thread->pt_flags &
     99 	    (PT_FLAG_DETACHED | PT_FLAG_SCOPE_SYSTEM | PT_FLAG_EXPLICIT_SCHED);
    100 
    101 	p->ptap_namearg = thread->pt_name;
    102 	p->ptap_stackaddr = thread->pt_stack.ss_sp;
    103 	p->ptap_stacksize = thread->pt_stack.ss_size;
    104 	p->ptap_guardsize = (size_t)sysconf(_SC_PAGESIZE);
    105 	return pthread_getschedparam(thread, &p->ptap_policy, &p->ptap_sp);
    106 }
    107 
    108 
    109 int
    110 pthread_attr_getdetachstate(const pthread_attr_t *attr, int *detachstate)
    111 {
    112 
    113 	if (attr->pta_flags & PT_FLAG_DETACHED)
    114 		*detachstate = PTHREAD_CREATE_DETACHED;
    115 	else
    116 		*detachstate = PTHREAD_CREATE_JOINABLE;
    117 
    118 	return 0;
    119 }
    120 
    121 
    122 int
    123 pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate)
    124 {
    125 
    126 	switch (detachstate) {
    127 	case PTHREAD_CREATE_JOINABLE:
    128 		attr->pta_flags &= ~PT_FLAG_DETACHED;
    129 		break;
    130 	case PTHREAD_CREATE_DETACHED:
    131 		attr->pta_flags |= PT_FLAG_DETACHED;
    132 		break;
    133 	default:
    134 		return EINVAL;
    135 	}
    136 
    137 	return 0;
    138 }
    139 
    140 
    141 int
    142 pthread_attr_getguardsize(const pthread_attr_t *attr, size_t *guard)
    143 {
    144 	struct pthread_attr_private *p;
    145 
    146 	if ((p = attr->pta_private) == NULL)
    147 		*guard = (size_t)sysconf(_SC_PAGESIZE);
    148 	else
    149 		*guard = p->ptap_guardsize;
    150 
    151 	return 0;
    152 }
    153 
    154 
    155 int
    156 pthread_attr_setguardsize(pthread_attr_t *attr, size_t guard)
    157 {
    158 	struct pthread_attr_private *p;
    159 
    160 	p = pthread__attr_init_private(attr);
    161 	if (p == NULL)
    162 		return ENOMEM;
    163 
    164 	p->ptap_guardsize = guard;
    165 
    166 	return 0;
    167 }
    168 
    169 
    170 int
    171 pthread_attr_getinheritsched(const pthread_attr_t *attr, int *inherit)
    172 {
    173 
    174 	if (attr->pta_flags & PT_FLAG_EXPLICIT_SCHED)
    175 		*inherit = PTHREAD_EXPLICIT_SCHED;
    176 	else
    177 		*inherit = PTHREAD_INHERIT_SCHED;
    178 
    179 	return 0;
    180 }
    181 
    182 
    183 int
    184 pthread_attr_setinheritsched(pthread_attr_t *attr, int inherit)
    185 {
    186 
    187 	switch (inherit) {
    188 	case PTHREAD_INHERIT_SCHED:
    189 		attr->pta_flags &= ~PT_FLAG_EXPLICIT_SCHED;
    190 		break;
    191 	case PTHREAD_EXPLICIT_SCHED:
    192 		attr->pta_flags |= PT_FLAG_EXPLICIT_SCHED;
    193 		break;
    194 	default:
    195 		return EINVAL;
    196 	}
    197 
    198 	return 0;
    199 }
    200 
    201 
    202 int
    203 pthread_attr_getscope(const pthread_attr_t *attr, int *scope)
    204 {
    205 
    206 	if (attr->pta_flags & PT_FLAG_SCOPE_SYSTEM)
    207 		*scope = PTHREAD_SCOPE_SYSTEM;
    208 	else
    209 		*scope = PTHREAD_SCOPE_PROCESS;
    210 
    211 	return 0;
    212 }
    213 
    214 
    215 int
    216 pthread_attr_setscope(pthread_attr_t *attr, int scope)
    217 {
    218 
    219 	switch (scope) {
    220 	case PTHREAD_SCOPE_PROCESS:
    221 		attr->pta_flags &= ~PT_FLAG_SCOPE_SYSTEM;
    222 		break;
    223 	case PTHREAD_SCOPE_SYSTEM:
    224 		attr->pta_flags |= PT_FLAG_SCOPE_SYSTEM;
    225 		break;
    226 	default:
    227 		return EINVAL;
    228 	}
    229 
    230 	return 0;
    231 }
    232 
    233 
    234 int
    235 pthread_attr_setschedparam(pthread_attr_t *attr,
    236 			   const struct sched_param *param)
    237 {
    238 	struct pthread_attr_private *p;
    239 	int error;
    240 
    241 	if (param == NULL)
    242 		return EINVAL;
    243 	p = pthread__attr_init_private(attr);
    244 	if (p == NULL)
    245 		return ENOMEM;
    246 	error = pthread__checkpri(param->sched_priority);
    247 	if (error == 0)
    248 		p->ptap_sp = *param;
    249 	return error;
    250 }
    251 
    252 
    253 int
    254 pthread_attr_getschedparam(const pthread_attr_t *attr,
    255 			   struct sched_param *param)
    256 {
    257 	struct pthread_attr_private *p;
    258 
    259 	if (param == NULL)
    260 		return EINVAL;
    261 	p = attr->pta_private;
    262 	if (p == NULL)
    263 		return ENOMEM;
    264 	*param = p->ptap_sp;
    265 	return 0;
    266 }
    267 
    268 
    269 int
    270 pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy)
    271 {
    272 	struct pthread_attr_private *p;
    273 
    274 
    275 	switch (policy) {
    276 	case SCHED_OTHER:
    277 	case SCHED_FIFO:
    278 	case SCHED_RR:
    279 		p = pthread__attr_init_private(attr);
    280 		if (p == NULL)
    281 			return ENOMEM;
    282 		p->ptap_policy = policy;
    283 		return 0;
    284 	default:
    285 		return ENOTSUP;
    286 	}
    287 }
    288 
    289 
    290 int
    291 pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy)
    292 {
    293 	struct pthread_attr_private *p;
    294 
    295 	p = attr->pta_private;
    296 	if (p == NULL) {
    297 		*policy = SCHED_OTHER;
    298 		return 0;
    299 	}
    300 	*policy = p->ptap_policy;
    301 	return 0;
    302 }
    303 
    304 
    305 int
    306 pthread_attr_getstack(const pthread_attr_t *attr, void **addr, size_t *size)
    307 {
    308 	struct pthread_attr_private *p;
    309 
    310 	if ((p = attr->pta_private) == NULL) {
    311 		*addr = NULL;
    312 		*size = pthread__stacksize;
    313 	} else {
    314 		*addr = p->ptap_stackaddr;
    315 		*size = p->ptap_stacksize;
    316 	}
    317 
    318 	return 0;
    319 }
    320 
    321 
    322 int
    323 pthread_attr_setstack(pthread_attr_t *attr, void *addr, size_t size)
    324 {
    325 	struct pthread_attr_private *p;
    326 
    327 	p = pthread__attr_init_private(attr);
    328 	if (p == NULL)
    329 		return ENOMEM;
    330 
    331 	p->ptap_stackaddr = addr;
    332 	p->ptap_stacksize = size;
    333 
    334 	return 0;
    335 }
    336 
    337 
    338 int
    339 pthread_attr_getstacksize(const pthread_attr_t *attr, size_t *size)
    340 {
    341 	struct pthread_attr_private *p;
    342 
    343 	if ((p = attr->pta_private) == NULL)
    344 		*size = pthread__stacksize;
    345 	else
    346 		*size = p->ptap_stacksize;
    347 
    348 	return 0;
    349 }
    350 
    351 
    352 int
    353 pthread_attr_setstacksize(pthread_attr_t *attr, size_t size)
    354 {
    355 	struct pthread_attr_private *p;
    356 
    357 	if (size < sysconf(_SC_THREAD_STACK_MIN))
    358 		return EINVAL;
    359 
    360 	p = pthread__attr_init_private(attr);
    361 	if (p == NULL)
    362 		return ENOMEM;
    363 
    364 	p->ptap_stacksize = size;
    365 
    366 	return 0;
    367 }
    368 
    369 
    370 int
    371 pthread_attr_getstackaddr(const pthread_attr_t *attr, void **addr)
    372 {
    373 	struct pthread_attr_private *p;
    374 
    375 	if ((p = attr->pta_private) == NULL)
    376 		*addr = NULL;
    377 	else
    378 		*addr = p->ptap_stackaddr;
    379 
    380 	return 0;
    381 }
    382 
    383 
    384 int
    385 pthread_attr_setstackaddr(pthread_attr_t *attr, void *addr)
    386 {
    387 	struct pthread_attr_private *p;
    388 
    389 	p = pthread__attr_init_private(attr);
    390 	if (p == NULL)
    391 		return ENOMEM;
    392 
    393 	p->ptap_stackaddr = addr;
    394 
    395 	return 0;
    396 }
    397 
    398 
    399 int
    400 pthread_attr_getname_np(const pthread_attr_t *attr, char *name, size_t len,
    401     void **argp)
    402 {
    403 	struct pthread_attr_private *p;
    404 
    405 	if ((p = attr->pta_private) == NULL) {
    406 		name[0] = '\0';
    407 		if (argp != NULL)
    408 			*argp = NULL;
    409 	} else {
    410 		strlcpy(name, p->ptap_name, len);
    411 		if (argp != NULL)
    412 			*argp = p->ptap_namearg;
    413 	}
    414 
    415 	return 0;
    416 }
    417 
    418 
    419 int
    420 pthread_attr_setname_np(pthread_attr_t *attr, const char *name, void *arg)
    421 {
    422 	struct pthread_attr_private *p;
    423 	int namelen;
    424 
    425 	p = pthread__attr_init_private(attr);
    426 	if (p == NULL)
    427 		return ENOMEM;
    428 
    429 	namelen = snprintf(p->ptap_name, PTHREAD_MAX_NAMELEN_NP, name, arg);
    430 	if (namelen >= PTHREAD_MAX_NAMELEN_NP) {
    431 		p->ptap_name[0] = '\0';
    432 		return EINVAL;
    433 	}
    434 	p->ptap_namearg = arg;
    435 
    436 	return 0;
    437 }
    438 
    439 int
    440 pthread_attr_setcreatesuspend_np(pthread_attr_t *attr)
    441 {
    442 	attr->pta_flags |= PT_FLAG_SUSPENDED;
    443 	return 0;
    444 }
    445