nptl/pthread_getattr_np.c

   1 /* Copyright (C) 2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <string.h>
  21 #include "pthreadP.h"
  22 #include <lowlevellock.h>
  23
  24
  25 int
  26 pthread_getattr_np (thread_id, attr)
  27      pthread_t thread_id;
  28      pthread_attr_t *attr;
  29 {
  30   struct pthread *thread = (struct pthread *) thread_id;
  31   struct pthread_attr *iattr = (struct pthread_attr *) attr;
  32
  33   /* We have to handle cancellation in the following code since we are
  34      locking another threads desriptor.  */
  35   pthread_cleanup_push ((void (*) (void *)) lll_unlock_wake_cb, &thread->lock);
  36
  37   lll_lock (thread->lock);
  38
  39   /* The thread library is responsible for keeping the values in the
  40      thread desriptor up-to-date in case the user changes them.  */
  41   memcpy (&iattr->schedparam, &thread->schedparam,
  42           sizeof (struct sched_param));
  43   iattr->schedpolicy = thread->schedpolicy;
  44
  45   /* Clear the flags work.  */
  46   iattr->flags = thread->flags;
  47
  48   /* The thread might be detached by now.  */
  49   if (IS_DETACHED (thread))
  50     iattr->flags |= ATTR_FLAG_DETACHSTATE;
  51
  52   /* This is the guardsize after adjusting it.  */
  53   iattr->guardsize = thread->guardsize;
  54
  55   /* The sizes are subject to alignment.  */
  56   iattr->stacksize = thread->stackblock_size;
  57   iattr->stackaddr = (char *) thread->stackblock + iattr->stacksize;
  58   iattr->flags |= ATTR_FLAG_STACKADDR;
  59
  60   lll_unlock (thread->lock);
  61
  62   pthread_cleanup_pop (0);
  63
  64   return 0;
  65 }