sysdeps/htl/pt-destroy-specific.c

   1 /* __pthread_destory_specific.  Hurd 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 #include <stdlib.h>
  21
  22 #include <pt-internal.h>
  23
  24 void
  25 __pthread_destroy_specific (struct __pthread *thread)
  26 {
  27   int i;
  28   int seen_one;
  29
  30   /* Check if there is any thread specific data.  */
  31   if (thread->thread_specifics == NULL)
  32     return;
  33
  34   __pthread_key_lock_ready ();
  35
  36   /* Iterate and call the destructors on any thread specific data.  */
  37   for (;;)
  38     {
  39       seen_one = 0;
  40
  41       __pthread_mutex_lock (&__pthread_key_lock);
  42
  43       for (i = 0; i < __pthread_key_count && i < thread->thread_specifics_size;
  44            i++)
  45         {
  46           void *value;
  47
  48           if (__pthread_key_destructors[i] == PTHREAD_KEY_INVALID)
  49             continue;
  50
  51           value = thread->thread_specifics[i];
  52           if (value != NULL)
  53             {
  54               thread->thread_specifics[i] = 0;
  55
  56               if (__pthread_key_destructors[i])
  57                 {
  58                   seen_one = 1;
  59                   __pthread_key_destructors[i] (value);
  60                 }
  61             }
  62         }
  63
  64       __pthread_mutex_unlock (&__pthread_key_lock);
  65
  66       if (!seen_one)
  67         break;
  68
  69       /* This may take a very long time.  Let those blocking on
  70          pthread_key_create or pthread_key_delete make progress.  */
  71       __sched_yield ();
  72     }
  73
  74   free (thread->thread_specifics);
  75   thread->thread_specifics = 0;
  76   thread->thread_specifics_size = 0;
  77 }