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pthread_attr.c revision 1.9 
      1 /*	$NetBSD: pthread_attr.c,v 1.9 2008/06/25 11:07:07 ad Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001,2002,2003 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 1.9 2008/06/25 11:07:07 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 	}
     60 	return p;
     61 }
     62 
     63 
     64 int
     65 pthread_attr_init(pthread_attr_t *attr)
     66 {
     67 
     68 	attr->pta_magic = PT_ATTR_MAGIC;
     69 	attr->pta_flags = 0;
     70 	attr->pta_private = NULL;
     71 
     72 	return 0;
     73 }
     74 
     75 
     76 int
     77 pthread_attr_destroy(pthread_attr_t *attr)
     78 {
     79 	struct pthread_attr_private *p;
     80 
     81 	if ((p = attr->pta_private) != NULL)
     82 		free(p);
     83 
     84 	return 0;
     85 }
     86 
     87 
     88 int
     89 pthread_attr_get_np(pthread_t thread, pthread_attr_t *attr)
     90 {
     91 	struct pthread_attr_private *p;
     92 
     93 	p = pthread__attr_init_private(attr);
     94 	if (p == NULL)
     95 		return ENOMEM;
     96 
     97 	attr->pta_flags = thread->pt_flags &
     98 	    (PT_FLAG_DETACHED | PT_FLAG_SCOPE_SYSTEM | PT_FLAG_EXPLICIT_SCHED);
     99 
    100 	p->ptap_namearg = thread->pt_name;
    101 	p->ptap_stackaddr = thread->pt_stack.ss_sp;
    102 	p->ptap_stacksize = thread->pt_stack.ss_size;
    103 	p->ptap_guardsize = (size_t)sysconf(_SC_PAGESIZE);
    104 
    105 	return 0;
    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 /*ARGSUSED*/
    236 pthread_attr_setschedparam(pthread_attr_t *attr,
    237     const struct sched_param *param)
    238 {
    239 
    240 	if (param == NULL)
    241 		return EINVAL;
    242 
    243 	if (param->sched_priority != 0)
    244 		return EINVAL;
    245 
    246 	return 0;
    247 }
    248 
    249 
    250 int
    251 /*ARGSUSED*/
    252 pthread_attr_getschedparam(const pthread_attr_t *attr,
    253     struct sched_param *param)
    254 {
    255 
    256 	if (param == NULL)
    257 		return EINVAL;
    258 
    259 	param->sched_priority = 0;
    260 
    261 	return 0;
    262 }
    263 
    264 
    265 int
    266 /*ARGSUSED*/
    267 pthread_attr_setschedpolicy(pthread_attr_t *attr,
    268     int policy)
    269 {
    270 
    271 	if (policy != SCHED_OTHER)
    272 		return ENOTSUP;
    273 
    274 	return 0;
    275 }
    276 
    277 
    278 int
    279 /*ARGSUSED*/
    280 pthread_attr_getschedpolicy(const pthread_attr_t *attr,
    281     int *policy)
    282 {
    283 
    284 	*policy = SCHED_OTHER;
    285 
    286 	return 0;
    287 }
    288 
    289 
    290 int
    291 pthread_attr_getstack(const pthread_attr_t *attr, void **addr, size_t *size)
    292 {
    293 	struct pthread_attr_private *p;
    294 
    295 	if ((p = attr->pta_private) == NULL) {
    296 		*addr = NULL;
    297 		*size = pthread__stacksize;
    298 	} else {
    299 		*addr = p->ptap_stackaddr;
    300 		*size = p->ptap_stacksize;
    301 	}
    302 
    303 	return 0;
    304 }
    305 
    306 
    307 int
    308 pthread_attr_setstack(pthread_attr_t *attr, void *addr, size_t size)
    309 {
    310 	struct pthread_attr_private *p;
    311 
    312 	p = pthread__attr_init_private(attr);
    313 	if (p == NULL)
    314 		return ENOMEM;
    315 
    316 	p->ptap_stackaddr = addr;
    317 	p->ptap_stacksize = size;
    318 
    319 	return 0;
    320 }
    321 
    322 
    323 int
    324 pthread_attr_getstacksize(const pthread_attr_t *attr, size_t *size)
    325 {
    326 	struct pthread_attr_private *p;
    327 
    328 	if ((p = attr->pta_private) == NULL)
    329 		*size = pthread__stacksize;
    330 	else
    331 		*size = p->ptap_stacksize;
    332 
    333 	return 0;
    334 }
    335 
    336 
    337 int
    338 pthread_attr_setstacksize(pthread_attr_t *attr, size_t size)
    339 {
    340 	struct pthread_attr_private *p;
    341 
    342 	if (size < sysconf(_SC_THREAD_STACK_MIN))
    343 		return EINVAL;
    344 
    345 	p = pthread__attr_init_private(attr);
    346 	if (p == NULL)
    347 		return ENOMEM;
    348 
    349 	p->ptap_stacksize = size;
    350 
    351 	return 0;
    352 }
    353 
    354 
    355 int
    356 pthread_attr_getstackaddr(const pthread_attr_t *attr, void **addr)
    357 {
    358 	struct pthread_attr_private *p;
    359 
    360 	if ((p = attr->pta_private) == NULL)
    361 		*addr = NULL;
    362 	else
    363 		*addr = p->ptap_stackaddr;
    364 
    365 	return 0;
    366 }
    367 
    368 
    369 int
    370 pthread_attr_setstackaddr(pthread_attr_t *attr, void *addr)
    371 {
    372 	struct pthread_attr_private *p;
    373 
    374 	p = pthread__attr_init_private(attr);
    375 	if (p == NULL)
    376 		return ENOMEM;
    377 
    378 	p->ptap_stackaddr = addr;
    379 
    380 	return 0;
    381 }
    382 
    383 
    384 int
    385 pthread_attr_getname_np(const pthread_attr_t *attr, char *name, size_t len,
    386     void **argp)
    387 {
    388 	struct pthread_attr_private *p;
    389 
    390 	if ((p = attr->pta_private) == NULL) {
    391 		name[0] = '\0';
    392 		if (argp != NULL)
    393 			*argp = NULL;
    394 	} else {
    395 		strlcpy(name, p->ptap_name, len);
    396 		if (argp != NULL)
    397 			*argp = p->ptap_namearg;
    398 	}
    399 
    400 	return 0;
    401 }
    402 
    403 
    404 int
    405 pthread_attr_setname_np(pthread_attr_t *attr, const char *name, void *arg)
    406 {
    407 	struct pthread_attr_private *p;
    408 	int namelen;
    409 
    410 	p = pthread__attr_init_private(attr);
    411 	if (p == NULL)
    412 		return ENOMEM;
    413 
    414 	namelen = snprintf(p->ptap_name, PTHREAD_MAX_NAMELEN_NP, name, arg);
    415 	if (namelen >= PTHREAD_MAX_NAMELEN_NP) {
    416 		p->ptap_name[0] = '\0';
    417 		return EINVAL;
    418 	}
    419 	p->ptap_namearg = arg;
    420 
    421 	return 0;
    422 }
    423 
    424 int
    425 pthread_attr_setcreatesuspend_np(pthread_attr_t *attr)
    426 {
    427 	attr->pta_flags |= PT_FLAG_SUSPENDED;
    428 	return 0;
    429 }
    430