relibc_pthreads-emb/pte_tkAssocDestroy.c

/*
 * pte_tkAssocDestroy.c
 *
 * Description:
 * This translation unit implements routines which are private to
 * the implementation and may be used throughout it.
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads-embedded (PTE) - POSIX Threads Library for embedded systems
 *      Copyright(C) 2008 Jason Schmidlapp
 *
 *      Contact Email: [email protected]
 *
 *
 *      Based upon Pthreads-win32 - POSIX Threads Library for Win32
 *      Copyright(C) 1998 John E. Bossom
 *      Copyright(C) 1999,2005 Pthreads-win32 contributors
 *
 *      Contact Email: [email protected]
 *
 *      The original list of contributors to the Pthreads-win32 project
 *      is contained in the file CONTRIBUTORS.ptw32 included with the
 *      source code distribution. The list can also be seen at the
 *      following World Wide Web location:
 *      http://sources.redhat.com/pthreads-win32/contributors.html
 *
 *      This 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 of the License, or (at your option) any later version.
 *
 *      This 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 this library in the file COPYING.LIB;
 *      if not, write to the Free Software Foundation, Inc.,
 *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

#include <stdlib.h>

#include "pthread.h"
#include "implement.h"


void
pte_tkAssocDestroy (ThreadKeyAssoc * assoc)
/*
 * -------------------------------------------------------------------
 * This routine releases all resources for the given ThreadKeyAssoc
 * once it is no longer being referenced
 * ie) either the key or thread has stopped referencing it.
 *
 * Parameters:
 *              assoc
 *                      an instance of ThreadKeyAssoc.
 * Returns:
 *      N/A
 * -------------------------------------------------------------------
 */
{

  /*
   * Both key->keyLock and thread->threadLock are locked on
   * entry to this routine.
   */
  if (assoc != NULL)
    {
      ThreadKeyAssoc * prev, * next;

      /* Remove assoc from thread's keys chain */
      prev = assoc->prevKey;
      next = assoc->nextKey;
      if (prev != NULL)
        {
          prev->nextKey = next;
        }
      if (next != NULL)
        {
          next->prevKey = prev;
        }

      if (assoc->thread->keys == assoc)
        {
          /* We're at the head of the thread's keys chain */
          assoc->thread->keys = next;
        }
      if (assoc->thread->nextAssoc == assoc)
        {
          /*
           * Thread is exiting and we're deleting the assoc to be processed next.
           * Hand thread the assoc after this one.
           */
          assoc->thread->nextAssoc = next;
        }

      /* Remove assoc from key's threads chain */
      prev = assoc->prevThread;
      next = assoc->nextThread;
      if (prev != NULL)
        {
          prev->nextThread = next;
        }
      if (next != NULL)
        {
          next->prevThread = prev;
        }

      if (assoc->key->threads == assoc)
        {
          /* We're at the head of the key's threads chain */
          assoc->key->threads = next;
        }

      free (assoc);
    }

}				/* pte_tkAssocDestroy */