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pthread_attr.c revision 1.13 
      1 /*	$NetBSD: pthread_attr.c,v 1.13 2010/08/06 05:25:02 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 1.13 2010/08/06 05:25:02 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 #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 		memset(param, 0, sizeof(*param));
    264 	else
    265 		*param = p->ptap_sp;
    266 	return 0;
    267 }
    268 
    269 
    270 int
    271 pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy)
    272 {
    273 	struct pthread_attr_private *p;
    274 
    275 
    276 	switch (policy) {
    277 	case SCHED_OTHER:
    278 	case SCHED_FIFO:
    279 	case SCHED_RR:
    280 		p = pthread__attr_init_private(attr);
    281 		if (p == NULL)
    282 			return ENOMEM;
    283 		p->ptap_policy = policy;
    284 		return 0;
    285 	default:
    286 		return ENOTSUP;
    287 	}
    288 }
    289 
    290 
    291 int
    292 pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy)
    293 {
    294 	struct pthread_attr_private *p;
    295 
    296 	p = attr->pta_private;
    297 	if (p == NULL) {
    298 		*policy = SCHED_OTHER;
    299 		return 0;
    300 	}
    301 	*policy = p->ptap_policy;
    302 	return 0;
    303 }
    304 
    305 
    306 int
    307 pthread_attr_getstack(const pthread_attr_t *attr, void **addr, size_t *size)
    308 {
    309 	struct pthread_attr_private *p;
    310 
    311 	if ((p = attr->pta_private) == NULL) {
    312 		*addr = NULL;
    313 		*size = pthread__stacksize;
    314 	} else {
    315 		*addr = p->ptap_stackaddr;
    316 		*size = p->ptap_stacksize;
    317 	}
    318 
    319 	return 0;
    320 }
    321 
    322 
    323 int
    324 pthread_attr_setstack(pthread_attr_t *attr, void *addr, size_t size)
    325 {
    326 	struct pthread_attr_private *p;
    327 
    328 	p = pthread__attr_init_private(attr);
    329 	if (p == NULL)
    330 		return ENOMEM;
    331 
    332 	p->ptap_stackaddr = addr;
    333 	p->ptap_stacksize = size;
    334 
    335 	return 0;
    336 }
    337 
    338 
    339 int
    340 pthread_attr_getstacksize(const pthread_attr_t *attr, size_t *size)
    341 {
    342 	struct pthread_attr_private *p;
    343 
    344 	if ((p = attr->pta_private) == NULL)
    345 		*size = pthread__stacksize;
    346 	else
    347 		*size = p->ptap_stacksize;
    348 
    349 	return 0;
    350 }
    351 
    352 
    353 int
    354 pthread_attr_setstacksize(pthread_attr_t *attr, size_t size)
    355 {
    356 	struct pthread_attr_private *p;
    357 
    358 	if (size < (size_t)sysconf(_SC_THREAD_STACK_MIN))
    359 		return EINVAL;
    360 
    361 	p = pthread__attr_init_private(attr);
    362 	if (p == NULL)
    363 		return ENOMEM;
    364 
    365 	p->ptap_stacksize = size;
    366 
    367 	return 0;
    368 }
    369 
    370 
    371 int
    372 pthread_attr_getstackaddr(const pthread_attr_t *attr, void **addr)
    373 {
    374 	struct pthread_attr_private *p;
    375 
    376 	if ((p = attr->pta_private) == NULL)
    377 		*addr = NULL;
    378 	else
    379 		*addr = p->ptap_stackaddr;
    380 
    381 	return 0;
    382 }
    383 
    384 
    385 int
    386 pthread_attr_setstackaddr(pthread_attr_t *attr, void *addr)
    387 {
    388 	struct pthread_attr_private *p;
    389 
    390 	p = pthread__attr_init_private(attr);
    391 	if (p == NULL)
    392 		return ENOMEM;
    393 
    394 	p->ptap_stackaddr = addr;
    395 
    396 	return 0;
    397 }
    398 
    399 
    400 int
    401 pthread_attr_getname_np(const pthread_attr_t *attr, char *name, size_t len,
    402     void **argp)
    403 {
    404 	struct pthread_attr_private *p;
    405 
    406 	if ((p = attr->pta_private) == NULL) {
    407 		name[0] = '\0';
    408 		if (argp != NULL)
    409 			*argp = NULL;
    410 	} else {
    411 		strlcpy(name, p->ptap_name, len);
    412 		if (argp != NULL)
    413 			*argp = p->ptap_namearg;
    414 	}
    415 
    416 	return 0;
    417 }
    418 
    419 
    420 int
    421 pthread_attr_setname_np(pthread_attr_t *attr, const char *name, void *arg)
    422 {
    423 	struct pthread_attr_private *p;
    424 	int namelen;
    425 
    426 	p = pthread__attr_init_private(attr);
    427 	if (p == NULL)
    428 		return ENOMEM;
    429 
    430 	namelen = snprintf(p->ptap_name, PTHREAD_MAX_NAMELEN_NP, name, arg);
    431 	if (namelen >= PTHREAD_MAX_NAMELEN_NP) {
    432 		p->ptap_name[0] = '\0';
    433 		return EINVAL;
    434 	}
    435 	p->ptap_namearg = arg;
    436 
    437 	return 0;
    438 }
    439 
    440 int
    441 pthread_attr_setcreatesuspend_np(pthread_attr_t *attr)
    442 {
    443 	attr->pta_flags |= PT_FLAG_SUSPENDED;
    444 	return 0;
    445 }
    446 
    447 int
    448 pthread_getattr_np(pthread_t thread, pthread_attr_t *attr)
    449 {
    450 	int error;
    451 	if ((error = pthread_attr_init(attr)) != 0)
    452 		return error;
    453 	if ((error = pthread_attr_get_np(thread, attr)) != 0) {
    454 		(void)pthread_attr_destroy(attr);
    455 		return error;
    456 	}
    457 	return 0;
    458 }
    459