1  /* Thread attributes retrieval.
       2     Copyright (C) 2008-2023 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)