Home | History | Annotate | Download | only in pthreads-win32 
      1 /*
      2  * ptw32_tkAssocDestroy.c
      3  *
      4  * Description:
      5  * This translation unit implements routines which are private to
      6  * the implementation and may be used throughout it.
      7  *
      8  * --------------------------------------------------------------------------
      9  *
     10  *      Pthreads-win32 - POSIX Threads Library for Win32
     11  *      Copyright(C) 1998 John E. Bossom
     12  *      Copyright(C) 1999,2005 Pthreads-win32 contributors
     13  *
     14  *      Contact Email: rpj (at) callisto.canberra.edu.au
     15  *
     16  *      The current list of contributors is contained
     17  *      in the file CONTRIBUTORS included with the source
     18  *      code distribution. The list can also be seen at the
     19  *      following World Wide Web location:
     20  *      http://sources.redhat.com/pthreads-win32/contributors.html
     21  *
     22  *      This library is free software; you can redistribute it and/or
     23  *      modify it under the terms of the GNU Lesser General Public
     24  *      License as published by the Free Software Foundation; either
     25  *      version 2 of the License, or (at your option) any later version.
     26  *
     27  *      This library is distributed in the hope that it will be useful,
     28  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
     29  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     30  *      Lesser General Public License for more details.
     31  *
     32  *      You should have received a copy of the GNU Lesser General Public
     33  *      License along with this library in the file COPYING.LIB;
     34  *      if not, write to the Free Software Foundation, Inc.,
     35  *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
     36  */
     37 
     38 #include "pthread.h"
     39 #include "implement.h"
     40 
     41 
     42 void
     43 ptw32_tkAssocDestroy (ThreadKeyAssoc * assoc)
     44      /*
     45       * -------------------------------------------------------------------
     46       * This routine releases all resources for the given ThreadKeyAssoc
     47       * once it is no longer being referenced
     48       * ie) either the key or thread has stopped referencing it.
     49       *
     50       * Parameters:
     51       *              assoc
     52       *                      an instance of ThreadKeyAssoc.
     53       * Returns:
     54       *      N/A
     55       * -------------------------------------------------------------------
     56       */
     57 {
     58 
     59   /*
     60    * Both key->keyLock and thread->threadLock are locked before
     61    * entry to this routine.
     62    */
     63   if (assoc != NULL)
     64     {
     65       ThreadKeyAssoc * prev, * next;
     66 
     67       /* Remove assoc from thread's keys chain */
     68       prev = assoc->prevKey;
     69       next = assoc->nextKey;
     70       if (prev != NULL)
     71 	{
     72 	  prev->nextKey = next;
     73 	}
     74       if (next != NULL)
     75 	{
     76 	  next->prevKey = prev;
     77 	}
     78 
     79       if (assoc->thread->keys == assoc)
     80 	{
     81 	  /* We're at the head of the thread's keys chain */
     82 	  assoc->thread->keys = next;
     83 	}
     84       if (assoc->thread->nextAssoc == assoc)
     85 	{
     86 	  /*
     87 	   * Thread is exiting and we're deleting the assoc to be processed next.
     88 	   * Hand thread the assoc after this one.
     89 	   */
     90 	  assoc->thread->nextAssoc = next;
     91 	}
     92 
     93       /* Remove assoc from key's threads chain */
     94       prev = assoc->prevThread;
     95       next = assoc->nextThread;
     96       if (prev != NULL)
     97 	{
     98 	  prev->nextThread = next;
     99 	}
    100       if (next != NULL)
    101 	{
    102 	  next->prevThread = prev;
    103 	}
    104 
    105       if (assoc->key->threads == assoc)
    106 	{
    107 	  /* We're at the head of the key's threads chain */
    108 	  assoc->key->threads = next;
    109 	}
    110 
    111       free (assoc);
    112     }
    113 
    114 }				/* ptw32_tkAssocDestroy */
    115