sysdeps/htl/pt-setspecific.c

   1 /* pthread_setspecific.  Generic version.
   2    Copyright (C) 2002-2022 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 <pthread.h>
  20
  21 #include <pt-internal.h>
  22
  23 int
  24 __pthread_setspecific (pthread_key_t key, const void *value)
  25 {
  26   struct __pthread *self = _pthread_self ();
  27
  28   if (key < 0 || key >= __pthread_key_count)
  29     return EINVAL;
  30
  31   if (key >= self->thread_specifics_size)
  32     {
  33       /* Amortize reallocation cost.  */
  34       int newsize = 2 * key + 1;
  35       void **new = realloc (self->thread_specifics,
  36                             newsize * sizeof (new[0]));
  37       if (new == NULL)
  38         return ENOMEM;
  39
  40       memset (&new[self->thread_specifics_size], 0,
  41               (newsize - self->thread_specifics_size) * sizeof (new[0]));
  42       self->thread_specifics = new;
  43       self->thread_specifics_size = newsize;
  44     }
  45
  46   self->thread_specifics[key] = (void *) value;
  47   return 0;
  48 }
  49 weak_alias (__pthread_setspecific, pthread_setspecific);
  50 hidden_def (__pthread_setspecific)