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glibc  2.9
Functions
attr.c File Reference
#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/resource.h>
#include "pthread.h"
#include "internals.h"
#include <shlib-compat.h>
#include <ldsodefs.h>

Go to the source code of this file.

Functions

int __pthread_attr_init_2_1 (pthread_attr_t *attr)
 versioned_symbol (libpthread, __pthread_attr_init_2_1, pthread_attr_init, GLIBC_2_1)
int __pthread_attr_destroy (pthread_attr_t *attr)
 strong_alias (__pthread_attr_destroy, pthread_attr_destroy)
int __pthread_attr_setdetachstate (pthread_attr_t *attr, int detachstate)
 strong_alias (__pthread_attr_setdetachstate, pthread_attr_setdetachstate)
int __pthread_attr_getdetachstate (const pthread_attr_t *attr, int *detachstate)
 strong_alias (__pthread_attr_getdetachstate, pthread_attr_getdetachstate)
int __pthread_attr_setschedparam (pthread_attr_t *attr, const struct sched_param *param)
 strong_alias (__pthread_attr_setschedparam, pthread_attr_setschedparam)
int __pthread_attr_getschedparam (const pthread_attr_t *attr, struct sched_param *param)
 strong_alias (__pthread_attr_getschedparam, pthread_attr_getschedparam)
int __pthread_attr_setschedpolicy (pthread_attr_t *attr, int policy)
 strong_alias (__pthread_attr_setschedpolicy, pthread_attr_setschedpolicy)
int __pthread_attr_getschedpolicy (const pthread_attr_t *attr, int *policy)
 strong_alias (__pthread_attr_getschedpolicy, pthread_attr_getschedpolicy)
int __pthread_attr_setinheritsched (pthread_attr_t *attr, int inherit)
 strong_alias (__pthread_attr_setinheritsched, pthread_attr_setinheritsched)
int __pthread_attr_getinheritsched (const pthread_attr_t *attr, int *inherit)
 strong_alias (__pthread_attr_getinheritsched, pthread_attr_getinheritsched)
int __pthread_attr_setscope (pthread_attr_t *attr, int scope)
 strong_alias (__pthread_attr_setscope, pthread_attr_setscope)
int __pthread_attr_getscope (const pthread_attr_t *attr, int *scope)
 strong_alias (__pthread_attr_getscope, pthread_attr_getscope)
int __pthread_attr_setguardsize (pthread_attr_t *attr, size_t guardsize)
 weak_alias (__pthread_attr_setguardsize, pthread_attr_setguardsize)
 weak_alias (__pthread_attr_getguardsize, pthread_attr_getguardsize)
 weak_alias (__pthread_attr_setstackaddr, link_warning(pthread_attr_setstackaddr)
 weak_alias (__pthread_attr_getstackaddr, link_warning(pthread_attr_getstackaddr)
 versioned_symbol (libpthread, __pthread_attr_setstacksize, pthread_attr_setstacksize, GLIBC_2_3_3)
int __pthread_attr_getstacksize (const pthread_attr_t *attr, size_t *stacksize)
 weak_alias (__pthread_attr_getstacksize, pthread_attr_getstacksize)
 versioned_symbol (libpthread, __pthread_attr_setstack, pthread_attr_setstack, GLIBC_2_3_3)
int __pthread_attr_getstack (const pthread_attr_t *attr, void **stackaddr, size_t *stacksize)
 weak_alias (__pthread_attr_getstack, pthread_attr_getstack)

Function Documentation

Definition at line 69 of file attr.c.

{
  return 0;
}
int __pthread_attr_getdetachstate ( const pthread_attr_t attr,
int detachstate 
)

Definition at line 85 of file attr.c.

{
  *detachstate = attr->__detachstate;
  return 0;
}

Definition at line 138 of file attr.c.

{
  *inherit = attr->__inheritsched;
  return 0;
}

Definition at line 105 of file attr.c.

{
  memcpy (param, &attr->__schedparam, sizeof (struct sched_param));
  return 0;
}

Definition at line 122 of file attr.c.

{
  *policy = attr->__schedpolicy;
  return 0;
}
int __pthread_attr_getscope ( const pthread_attr_t attr,
int scope 
)

Definition at line 159 of file attr.c.

{
  *scope = attr->__scope;
  return 0;
}
int __pthread_attr_getstack ( const pthread_attr_t attr,
void **  stackaddr,
size_t stacksize 
)

Definition at line 337 of file attr.c.

{
  /* XXX This function has a stupid definition.  The standard specifies
     no error value but what is if no stack address was set?  We simply
     return the value we have in the member.  */
#ifndef _STACK_GROWS_UP
  *stackaddr = (char *) attr->__stackaddr - attr->__stacksize;
#else
  *stackaddr = attr->__stackaddr;
#endif
  *stacksize = attr->__stacksize;
  return 0;
}

Definition at line 272 of file attr.c.

{
  *stacksize = attr->__stacksize;
  return 0;
}

Definition at line 32 of file attr.c.

{
  size_t ps = __getpagesize ();

  attr->__detachstate = PTHREAD_CREATE_JOINABLE;
  attr->__schedpolicy = SCHED_OTHER;
  attr->__schedparam.sched_priority = 0;
  attr->__inheritsched = PTHREAD_EXPLICIT_SCHED;
  attr->__scope = PTHREAD_SCOPE_SYSTEM;
#ifdef NEED_SEPARATE_REGISTER_STACK
  attr->__guardsize = ps + ps;
#else
  attr->__guardsize = ps;
#endif
  attr->__stackaddr = NULL;
  attr->__stackaddr_set = 0;
  attr->__stacksize = STACK_SIZE - ps;
  return 0;
}
int __pthread_attr_setdetachstate ( pthread_attr_t attr,
int  detachstate 
)

Definition at line 75 of file attr.c.

{
  if (detachstate < PTHREAD_CREATE_JOINABLE ||
      detachstate > PTHREAD_CREATE_DETACHED)
    return EINVAL;
  attr->__detachstate = detachstate;
  return 0;
}

Definition at line 166 of file attr.c.

{
  /* The guard size must not be larger than the stack itself */
  if (guardsize >= attr->__stacksize) return EINVAL;

  attr->__guardsize = guardsize;

  return 0;
}

Definition at line 129 of file attr.c.

{
  if (inherit != PTHREAD_INHERIT_SCHED && inherit != PTHREAD_EXPLICIT_SCHED)
    return EINVAL;
  attr->__inheritsched = inherit;
  return 0;
}

Definition at line 92 of file attr.c.

{
  int max_prio = __sched_get_priority_max(attr->__schedpolicy);
  int min_prio = __sched_get_priority_min(attr->__schedpolicy);

  if (param->sched_priority < min_prio || param->sched_priority > max_prio)
    return EINVAL;
  memcpy (&attr->__schedparam, param, sizeof (struct sched_param));
  return 0;
}

Definition at line 113 of file attr.c.

{
  if (policy != SCHED_OTHER && policy != SCHED_FIFO && policy != SCHED_RR)
    return EINVAL;
  attr->__schedpolicy = policy;
  return 0;
}
int __pthread_attr_setscope ( pthread_attr_t attr,
int  scope 
)

Definition at line 145 of file attr.c.

{
  switch (scope) {
  case PTHREAD_SCOPE_SYSTEM:
    attr->__scope = scope;
    return 0;
  case PTHREAD_SCOPE_PROCESS:
    return ENOTSUP;
  default:
    return EINVAL;
  }
}
versioned_symbol ( libpthread  ,
__pthread_attr_init_2_1  ,
pthread_attr_init  ,
GLIBC_2_1   
)
versioned_symbol ( libpthread  ,
__pthread_attr_setstacksize  ,
pthread_attr_setstacksize  ,
GLIBC_2_3_3   
)
versioned_symbol ( libpthread  ,
__pthread_attr_setstack  ,
pthread_attr_setstack  ,
GLIBC_2_3_3   
)

Definition at line 175 of file attr.c.

{
  *guardsize = attr->__guardsize;
  return 0;
}

Definition at line 182 of file attr.c.

{
  attr->__stackaddr = stackaddr;
  attr->__stackaddr_set = 1;
  return 0;
}
weak_alias ( __pthread_attr_setstackaddr  ,
link_warning pthread_attr_setstackaddr 
)

Definition at line 190 of file attr.c.

{
  /* XXX This function has a stupid definition.  The standard specifies
     no error value but what is if no stack address was set?  We simply
     return the value we have in the member.  */
  *stackaddr = attr->__stackaddr;
  return 0;
}
weak_alias ( __pthread_attr_getstackaddr  ,
link_warning pthread_attr_getstackaddr 
)

Definition at line 203 of file attr.c.

{
#ifdef FLOATING_STACKS
  /* We have to check against the maximum allowed stack size.  This is no
     problem if the manager is already started and we determined it.  If
     this hasn't happened, we have to find the limit outself.  */
  if (__pthread_max_stacksize == 0)
    __pthread_init_max_stacksize ();

  if (stacksize > __pthread_max_stacksize)
    return EINVAL;
#else
  /* We have a fixed size limit.  */
  if (stacksize > STACK_SIZE)
    return EINVAL;
#endif

  /* We don't accept value smaller than PTHREAD_STACK_MIN.  */
  if (stacksize < PTHREAD_STACK_MIN)
    return EINVAL;

  attr->__stacksize = stacksize;
  return 0;
}

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Definition at line 277 of file attr.c.

{
  int err;

  if ((((uintptr_t) stackaddr)
       & (__alignof__ (struct _pthread_descr_struct) - 1)) != 0)
    err = EINVAL;
  else
    err = __pthread_attr_setstacksize (attr, stacksize);
  if (err == 0)
    {
#ifndef _STACK_GROWS_UP
      attr->__stackaddr = (char *) stackaddr + stacksize;
#else
      attr->__stackaddr = stackaddr;
#endif
      attr->__stackaddr_set = 1;
    }

  return err;
}

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weak_alias ( __pthread_attr_getstack  ,
pthread_attr_getstack   
)

Definition at line 351 of file attr.c.

{
  pthread_handle handle = thread_handle (thread);
  pthread_descr descr;
  int ret = 0;

  if (handle == NULL)
    return ENOENT;

  descr = handle->h_descr;

  attr->__detachstate = (descr->p_detached
                      ? PTHREAD_CREATE_DETACHED
                      : PTHREAD_CREATE_JOINABLE);

  attr->__schedpolicy = __sched_getscheduler (descr->p_pid);
  if (attr->__schedpolicy == -1)
    return errno;

  if (__sched_getparam (descr->p_pid,
                     (struct sched_param *) &attr->__schedparam) != 0)
    return errno;

  attr->__inheritsched = descr->p_inheritsched;
  attr->__scope = PTHREAD_SCOPE_SYSTEM;

#ifdef _STACK_GROWS_DOWN
# ifdef USE_TLS
  attr->__stacksize = descr->p_stackaddr - (char *)descr->p_guardaddr
                    - descr->p_guardsize;
# else
  attr->__stacksize = (char *)(descr + 1) - (char *)descr->p_guardaddr
                    - descr->p_guardsize;
# endif
#else
# ifdef USE_TLS
  attr->__stacksize = (char *)descr->p_guardaddr - descr->p_stackaddr;
# else
  attr->__stacksize = (char *)descr->p_guardaddr - (char *)descr;
# endif
#endif
  attr->__guardsize = descr->p_guardsize;
  attr->__stackaddr_set = descr->p_userstack;
#ifdef NEED_SEPARATE_REGISTER_STACK
  if (descr->p_userstack == 0)
    attr->__stacksize *= 2;
  /* XXX This is awkward.  The guard pages are in the middle of the
     two stacks.  We must count the guard size in the stack size since
     otherwise the range of the stack area cannot be computed.  */
  attr->__stacksize += attr->__guardsize;
#endif
#ifdef USE_TLS
  attr->__stackaddr = descr->p_stackaddr;
#else
# ifndef _STACK_GROWS_UP
  attr->__stackaddr = (char *)(descr + 1);
# else
  attr->__stackaddr = (char *)descr;
# endif
#endif

#ifdef USE_TLS
  if (attr->__stackaddr == NULL)
#else
  if (descr == &__pthread_initial_thread)
#endif
    {
      /* Stack size limit.  */
      struct rlimit rl;

      /* The safest way to get the top of the stack is to read
        /proc/self/maps and locate the line into which
        __libc_stack_end falls.  */
      FILE *fp = fopen ("/proc/self/maps", "rc");
      if (fp == NULL)
       ret = errno;
      /* We need the limit of the stack in any case.  */
      else if (getrlimit (RLIMIT_STACK, &rl) != 0)
       ret = errno;
      else
       {
         /* We need no locking.  */
         __fsetlocking (fp, FSETLOCKING_BYCALLER);

         /* Until we found an entry (which should always be the case)
            mark the result as a failure.  */
         ret = ENOENT;

         char *line = NULL;
         size_t linelen = 0;
         uintptr_t last_to = 0;

         while (! feof_unlocked (fp))
           {
             if (__getdelim (&line, &linelen, '\n', fp) <= 0)
              break;

             uintptr_t from;
             uintptr_t to;
             if (sscanf (line, "%" SCNxPTR "-%" SCNxPTR, &from, &to) != 2)
              continue;
             if (from <= (uintptr_t) __libc_stack_end
                && (uintptr_t) __libc_stack_end < to)
              {
                /* Found the entry.  Now we have the info we need.  */
                attr->__stacksize = rl.rlim_cur;
#ifdef _STACK_GROWS_UP
                /* Don't check to enforce a limit on the __stacksize */
                attr->__stackaddr = (void *) from;
#else
                attr->__stackaddr = (void *) to;

                /* The limit might be too high.  */
                if ((size_t) attr->__stacksize
                    > (size_t) attr->__stackaddr - last_to)
                  attr->__stacksize = (size_t) attr->__stackaddr - last_to;
#endif

                /* We succeed and no need to look further.  */
                ret = 0;
                break;
              }
             last_to = to;
           }

         fclose (fp);
         free (line);
       }
    }

  return 0;

}

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