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  }