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/*
* pthread_key_delete.c
*
* Description:
* POSIX thread functions which implement thread-specific data (TSD).
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2005 Pthreads-win32 contributors
*
* Contact Email: rpj@callisto.canberra.edu.au
*
* The current list of contributors is contained
* in the file CONTRIBUTORS 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 "pthread.h"
#include "implement.h"
int
pthread_key_delete (pthread_key_t key)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function deletes a thread-specific data key. This
* does not change the value of the thread specific data key
* for any thread and does not run the key's destructor
* in any thread so it should be used with caution.
*
* PARAMETERS
* key
* pointer to an instance of pthread_key_t
*
*
* DESCRIPTION
* This function deletes a thread-specific data key. This
* does not change the value of the thread specific data key
* for any thread and does not run the key's destructor
* in any thread so it should be used with caution.
*
* RESULTS
* 0 successfully deleted the key,
* EINVAL key is invalid,
*
* ------------------------------------------------------
*/
{
int result = 0;
if (key != NULL)
{
if (key->threads != NULL &&
key->destructor != NULL &&
pthread_mutex_lock (&(key->keyLock)) == 0)
{
/*
* Run through all Thread<-->Key associations
* for this key.
* If the pthread_t still exists (ie the assoc->thread
* is not NULL) then leave the assoc for the thread to
* destroy.
* Notes:
* If assoc->thread is NULL, then the associated thread
* is no longer referencing this assoc.
* The association is only referenced
* by this key and must be released; otherwise
* the assoc will be destroyed when the thread is destroyed.
*/
ThreadKeyAssoc *assoc;
assoc = (ThreadKeyAssoc *) key->threads;
while (assoc != NULL)
{
ThreadKeyAssoc *next;
ptw32_thread_t * thread = assoc->thread;
if (thread != NULL
&& pthread_mutex_lock (&(thread->threadLock)) == 0)
{
next = assoc->nextThread;
ptw32_tkAssocDestroy (assoc);
(void) pthread_mutex_unlock (&(thread->threadLock));
}
else
{
/* Thread or lock is no longer valid */
next = assoc->nextThread;
ptw32_tkAssocDestroy (assoc);
}
assoc = next;
}
pthread_mutex_unlock (&(key->keyLock));
}
TlsFree (key->key);
if (key->destructor != NULL)
{
pthread_mutex_destroy (&(key->keyLock));
}
#if defined( _DEBUG )
memset ((char *) key, 0, sizeof (*key));
#endif
free (key);
}
return (result);
}
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