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glibc  2.9
pthread_key_delete.c
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00001 /* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <errno.h>
00021 #include "pthreadP.h"
00022 #include <atomic.h>
00023 
00024 
00025 int
00026 pthread_key_delete (key)
00027      pthread_key_t key;
00028 {
00029   int result = EINVAL;
00030 
00031   if (__builtin_expect (key < PTHREAD_KEYS_MAX, 1))
00032     {
00033       unsigned int seq = __pthread_keys[key].seq;
00034 
00035       if (__builtin_expect (! KEY_UNUSED (seq), 1)
00036          && ! atomic_compare_and_exchange_bool_acq (&__pthread_keys[key].seq,
00037                                                seq + 1, seq))
00038        /* We deleted a valid key.  */
00039        result = 0;
00040     }
00041 
00042   return result;
00043 }