1  /* Copyright (C) 2002-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <errno.h>
      19  #include "pthreadP.h"
      20  #include <atomic.h>
      21  #include <shlib-compat.h>
      22  
      23  int
      24  ___pthread_key_delete (pthread_key_t key)
      25  {
      26    int result = EINVAL;
      27  
      28    if (__glibc_likely (key < PTHREAD_KEYS_MAX))
      29      {
      30        unsigned int seq = __pthread_keys[key].seq;
      31  
      32        if (__builtin_expect (! KEY_UNUSED (seq), 1)
      33  	  && ! atomic_compare_and_exchange_bool_acq (&__pthread_keys[key].seq,
      34  						     seq + 1, seq))
      35  	/* We deleted a valid key.  */
      36  	result = 0;
      37      }
      38  
      39    return result;
      40  }
      41  versioned_symbol (libc, ___pthread_key_delete, pthread_key_delete,
      42  		  GLIBC_2_34);
      43  libc_hidden_ver (___pthread_key_delete, __pthread_key_delete)
      44  #ifndef SHARED
      45  strong_alias (___pthread_key_delete, __pthread_key_delete)
      46  #endif
      47  
      48  #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_34)
      49  compat_symbol (libpthread, ___pthread_key_delete, pthread_key_delete,
      50  	       GLIBC_2_0);
      51  #endif