htl/pt-getattr.c

   1 /* Thread attributes retrieval.
   2    Copyright (C) 2008-2020 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library;  if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <assert.h>
  20 #include <errno.h>
  21 #include <pthread.h>
  22
  23 #include <pt-internal.h>
  24
  25 /* Initialize thread attribute *ATTR with attributes corresponding to the
  26    already running thread THREAD.  It shall be called on an uninitialized ATTR
  27    and destroyed with pthread_attr_destroy when no longer needed.  */
  28 int
  29 __pthread_getattr_np (pthread_t thread, pthread_attr_t *attr)
  30 {
  31   struct __pthread *pthread;
  32
  33   pthread = __pthread_getid (thread);
  34   if (pthread == NULL)
  35     return ESRCH;
  36
  37   /* Some attributes (schedparam, inheritsched, contentionscope and schedpolicy)
  38      are not supported yet, so fill them with our default values.  */
  39   *attr = __pthread_default_attr;
  40
  41   attr->__stackaddr = (pthread->stackaddr
  42                        + ((pthread->guardsize + __vm_page_size - 1)
  43                           / __vm_page_size * __vm_page_size));
  44   attr->__stacksize = pthread->stacksize;
  45   attr->__guardsize = pthread->guardsize;
  46   attr->__detachstate = (pthread->state == PTHREAD_DETACHED
  47                          ? PTHREAD_CREATE_DETACHED : PTHREAD_CREATE_JOINABLE);
  48
  49   return 0;
  50 }
  51 weak_alias (__pthread_getattr_np, pthread_getattr_np)