/* pthread_setspecific.  Generic version.
   Copyright (C) 2002-2026 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library;  if not, see
   <https://www.gnu.org/licenses/>.  */

#include <pthread.h>

#include <pt-internal.h>
#include <shlib-compat.h>
#include <string.h>

int
__pthread_setspecific (pthread_key_t key, const void *value)
{
  struct __pthread *self = _pthread_self ();

  if (key < 0 || key >= __pthread_key_count)
    return EINVAL;

  if (self->thread_specifics == NULL)
    {
      if (key < PTHREAD_STATIC_KEYS)
	{
	  self->static_thread_specifics[key] = (void *) value;
	  return 0;
	}
    }

  if (key >= self->thread_specifics_size)
    {
      /* Amortize reallocation cost.  */
      int newsize = 2 * key + 1;
      void **new;

      if (self->thread_specifics == NULL)
	{
	  self->thread_specifics_size = PTHREAD_STATIC_KEYS;
	  new = malloc (newsize * sizeof (new[0]));
	  if (new != NULL)
	    memcpy (new, self->static_thread_specifics,
		    PTHREAD_STATIC_KEYS * sizeof (new[0]));
	}
      else
	{
	  new = realloc (self->thread_specifics,
			 newsize * sizeof (new[0]));
	}
      if (new == NULL)
	return ENOMEM;

      memset (&new[self->thread_specifics_size], 0,
	      (newsize - self->thread_specifics_size) * sizeof (new[0]));
      self->thread_specifics = new;
      self->thread_specifics_size = newsize;
    }

  self->thread_specifics[key] = (void *) value;
  return 0;
}
libc_hidden_def (__pthread_setspecific)
versioned_symbol (libc, __pthread_setspecific, pthread_setspecific, GLIBC_2_42);

#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_12, GLIBC_2_42)
compat_symbol (libpthread, __pthread_setspecific, pthread_setspecific, GLIBC_2_12);
#endif
