linuxthreads/attr.c

   1 /* Linuxthreads - a simple clone()-based implementation of Posix        */
   2 /* threads for Linux.                                                   */
   3 /* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr)              */
   4 /*                                                                      */
   5 /* This program is free software; you can redistribute it and/or        */
   6 /* modify it under the terms of the GNU Library General Public License  */
   7 /* as published by the Free Software Foundation; either version 2       */
   8 /* of the License, or (at your option) any later version.               */
   9 /*                                                                      */
  10 /* This program is distributed in the hope that it will be useful,      */
  11 /* but WITHOUT ANY WARRANTY; without even the implied warranty of       */
  12 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        */
  13 /* GNU Library General Public License for more details.                 */
  14
  15 /* Handling of thread attributes */
  16
  17 #include <errno.h>
  18 #include <string.h>
  19 #include <unistd.h>
  20 #include <sys/param.h>
  21 #include "pthread.h"
  22 #include "internals.h"
  23
  24 int __pthread_attr_init_2_1(pthread_attr_t *attr)
  25 {
  26   size_t ps = __getpagesize ();
  27
  28   attr->__detachstate = PTHREAD_CREATE_JOINABLE;
  29   attr->__schedpolicy = SCHED_OTHER;
  30   attr->__schedparam.sched_priority = 0;
  31   attr->__inheritsched = PTHREAD_EXPLICIT_SCHED;
  32   attr->__scope = PTHREAD_SCOPE_SYSTEM;
  33   attr->__guardsize = ps;
  34   attr->__stackaddr = NULL;
  35   attr->__stackaddr_set = 0;
  36   attr->__stacksize = STACK_SIZE - ps;
  37   return 0;
  38 }
  39 #if defined HAVE_ELF && defined PIC && defined DO_VERSIONING
  40 default_symbol_version (__pthread_attr_init_2_1, pthread_attr_init, GLIBC_2.1);
  41
  42 int __pthread_attr_init_2_0(pthread_attr_t *attr)
  43 {
  44   attr->__detachstate = PTHREAD_CREATE_JOINABLE;
  45   attr->__schedpolicy = SCHED_OTHER;
  46   attr->__schedparam.sched_priority = 0;
  47   attr->__inheritsched = PTHREAD_EXPLICIT_SCHED;
  48   attr->__scope = PTHREAD_SCOPE_SYSTEM;
  49   return 0;
  50 }
  51 symbol_version (__pthread_attr_init_2_0, pthread_attr_init, GLIBC_2.0);
  52 #else
  53 strong_alias (__pthread_attr_init_2_1, pthread_attr_init)
  54 #endif
  55
  56 int pthread_attr_destroy(pthread_attr_t *attr)
  57 {
  58   return 0;
  59 }
  60
  61 int pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate)
  62 {
  63   if (detachstate < PTHREAD_CREATE_JOINABLE ||
  64       detachstate > PTHREAD_CREATE_DETACHED)
  65     return EINVAL;
  66   attr->__detachstate = detachstate;
  67   return 0;
  68 }
  69
  70 int pthread_attr_getdetachstate(const pthread_attr_t *attr, int *detachstate)
  71 {
  72   *detachstate = attr->__detachstate;
  73   return 0;
  74 }
  75
  76 int pthread_attr_setschedparam(pthread_attr_t *attr,
  77                                const struct sched_param *param)
  78 {
  79   int max_prio = __sched_get_priority_max(attr->__schedpolicy);
  80   int min_prio = __sched_get_priority_min(attr->__schedpolicy);
  81
  82   if (param->sched_priority < min_prio || param->sched_priority > max_prio)
  83     return EINVAL;
  84   memcpy (&attr->__schedparam, param, sizeof (struct sched_param));
  85   return 0;
  86 }
  87
  88 int pthread_attr_getschedparam(const pthread_attr_t *attr,
  89                                struct sched_param *param)
  90 {
  91   memcpy (param, &attr->__schedparam, sizeof (struct sched_param));
  92   return 0;
  93 }
  94
  95 int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy)
  96 {
  97   if (policy != SCHED_OTHER && policy != SCHED_FIFO && policy != SCHED_RR)
  98     return EINVAL;
  99   attr->__schedpolicy = policy;
 100   return 0;
 101 }
 102
 103 int pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy)
 104 {
 105   *policy = attr->__schedpolicy;
 106   return 0;
 107 }
 108
 109 int pthread_attr_setinheritsched(pthread_attr_t *attr, int inherit)
 110 {
 111   if (inherit != PTHREAD_INHERIT_SCHED && inherit != PTHREAD_EXPLICIT_SCHED)
 112     return EINVAL;
 113   attr->__inheritsched = inherit;
 114   return 0;
 115 }
 116
 117 int pthread_attr_getinheritsched(const pthread_attr_t *attr, int *inherit)
 118 {
 119   *inherit = attr->__inheritsched;
 120   return 0;
 121 }
 122
 123 int pthread_attr_setscope(pthread_attr_t *attr, int scope)
 124 {
 125   switch (scope) {
 126   case PTHREAD_SCOPE_SYSTEM:
 127     attr->__scope = scope;
 128     return 0;
 129   case PTHREAD_SCOPE_PROCESS:
 130     return ENOTSUP;
 131   default:
 132     return EINVAL;
 133   }
 134 }
 135
 136 int pthread_attr_getscope(const pthread_attr_t *attr, int *scope)
 137 {
 138   *scope = attr->__scope;
 139   return 0;
 140 }
 141
 142 int __pthread_attr_setguardsize(pthread_attr_t *attr, size_t guardsize)
 143 {
 144   size_t ps = __getpagesize ();
 145
 146   /* First round up the guard size.  */
 147   guardsize = roundup (guardsize, ps);
 148
 149   /* The guard size must not be larger than the stack itself */
 150   if (guardsize >= attr->__stacksize) return EINVAL;
 151
 152   attr->__guardsize = guardsize;
 153
 154   return 0;
 155 }
 156 weak_alias (__pthread_attr_setguardsize, pthread_attr_setguardsize)
 157
 158 int __pthread_attr_getguardsize(const pthread_attr_t *attr, size_t *guardsize)
 159 {
 160   *guardsize = attr->__guardsize;
 161   return 0;
 162 }
 163 weak_alias (__pthread_attr_getguardsize, pthread_attr_getguardsize)
 164
 165 int __pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr)
 166 {
 167   attr->__stackaddr = stackaddr;
 168   attr->__stackaddr_set = 1;
 169   return 0;
 170 }
 171 weak_alias (__pthread_attr_setstackaddr, pthread_attr_setstackaddr)
 172
 173 int __pthread_attr_getstackaddr(const pthread_attr_t *attr, void **stackaddr)
 174 {
 175   /* XXX This function has a stupid definition.  The standard specifies
 176      no error value but what is if no stack address was set?  We simply
 177      return the value we have in the member.  */
 178   *stackaddr = attr->__stackaddr;
 179   return 0;
 180 }
 181 weak_alias (__pthread_attr_getstackaddr, pthread_attr_getstackaddr)
 182
 183 int __pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize)
 184 {
 185   /* We don't accept value smaller than PTHREAD_STACK_MIN.  */
 186   if (stacksize < PTHREAD_STACK_MIN)
 187     return EINVAL;
 188
 189   attr->__stacksize = stacksize;
 190   return 0;
 191 }
 192 weak_alias (__pthread_attr_setstacksize, pthread_attr_setstacksize)
 193
 194 int __pthread_attr_getstacksize(const pthread_attr_t *attr, size_t *stacksize)
 195 {
 196   *stacksize = attr->__stacksize;
 197   return 0;
 198 }
 199 weak_alias (__pthread_attr_getstacksize, pthread_attr_getstacksize)