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/*
* pthread_key_delete.c
*
* Description:
* POSIX thread functions which implement thread-specific data (TSD).
*
* --------------------------------------------------------------------------
*
* Pthreads4w - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999-2018, Pthreads4w contributors
*
* Homepage: https://sourceforge.net/projects/pthreads4w/
*
* 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:
* https://sourceforge.net/p/pthreads4w/wiki/Contributors/
*
* This file is part of Pthreads4w.
*
* Pthreads4w is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pthreads4w 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Pthreads4w. If not, see <http://www.gnu.org/licenses/>. *
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#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,
*
* ------------------------------------------------------
*/
{
ptw32_mcs_local_node_t keyLock;
int result = 0;
if (key != NULL)
{
if (key->threads != NULL && key->destructor != NULL)
{
ThreadKeyAssoc *assoc;
ptw32_mcs_lock_acquire (&(key->keyLock), &keyLock);
/*
* Run through all Thread<-->Key associations
* for this key.
*
* While we hold at least one of the locks guarding
* the assoc, we know that the assoc pointed to by
* key->threads is valid.
*/
while ((assoc = (ThreadKeyAssoc *) key->threads) != NULL)
{
ptw32_mcs_local_node_t threadLock;
ptw32_thread_t * thread = assoc->thread;
if (assoc == NULL)
{
/* Finished */
break;
}
ptw32_mcs_lock_acquire (&(thread->threadLock), &threadLock);
/*
* Since we are starting at the head of the key's threads
* chain, this will also point key->threads at the next assoc.
* While we hold key->keyLock, no other thread can insert
* a new assoc for this key via pthread_setspecific.
*/
ptw32_tkAssocDestroy (assoc);
ptw32_mcs_lock_release (&threadLock);
}
ptw32_mcs_lock_release (&keyLock);
}
TlsFree (key->key);
if (key->destructor != NULL)
{
/* A thread could be holding the keyLock */
ptw32_mcs_lock_acquire (&(key->keyLock), &keyLock);
ptw32_mcs_lock_release (&keyLock);
}
#if defined( _DEBUG )
memset ((char *) key, 0, sizeof (*key));
#endif
free (key);
}
return (result);
}
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