1 /* $NetBSD: pthread_attr.c,v 1.8 2008/04/28 20:23:01 martin 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 1.8 2008/04/28 20:23:01 martin 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 p = pthread__attr_init_private(attr); 343 if (p == NULL) 344 return ENOMEM; 345 346 p->ptap_stacksize = size; 347 348 return 0; 349 } 350 351 352 int 353 pthread_attr_getstackaddr(const pthread_attr_t *attr, void **addr) 354 { 355 struct pthread_attr_private *p; 356 357 if ((p = attr->pta_private) == NULL) 358 *addr = NULL; 359 else 360 *addr = p->ptap_stackaddr; 361 362 return 0; 363 } 364 365 366 int 367 pthread_attr_setstackaddr(pthread_attr_t *attr, void *addr) 368 { 369 struct pthread_attr_private *p; 370 371 p = pthread__attr_init_private(attr); 372 if (p == NULL) 373 return ENOMEM; 374 375 p->ptap_stackaddr = addr; 376 377 return 0; 378 } 379 380 381 int 382 pthread_attr_getname_np(const pthread_attr_t *attr, char *name, size_t len, 383 void **argp) 384 { 385 struct pthread_attr_private *p; 386 387 if ((p = attr->pta_private) == NULL) { 388 name[0] = '\0'; 389 if (argp != NULL) 390 *argp = NULL; 391 } else { 392 strlcpy(name, p->ptap_name, len); 393 if (argp != NULL) 394 *argp = p->ptap_namearg; 395 } 396 397 return 0; 398 } 399 400 401 int 402 pthread_attr_setname_np(pthread_attr_t *attr, const char *name, void *arg) 403 { 404 struct pthread_attr_private *p; 405 int namelen; 406 407 p = pthread__attr_init_private(attr); 408 if (p == NULL) 409 return ENOMEM; 410 411 namelen = snprintf(p->ptap_name, PTHREAD_MAX_NAMELEN_NP, name, arg); 412 if (namelen >= PTHREAD_MAX_NAMELEN_NP) { 413 p->ptap_name[0] = '\0'; 414 return EINVAL; 415 } 416 p->ptap_namearg = arg; 417 418 return 0; 419 } 420 421 int 422 pthread_attr_setcreatesuspend_np(pthread_attr_t *attr) 423 { 424 attr->pta_flags |= PT_FLAG_SUSPENDED; 425 return 0; 426 } 427