1  /* pthread_setspecific.  Generic version.
       2     Copyright (C) 2002-2023 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 <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)