126 lines
4 KiB
C
126 lines
4 KiB
C
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/*
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* pthread_key_delete.c
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*
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* Description:
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* POSIX thread functions which implement thread-specific data (TSD).
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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int
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pthread_key_delete (pthread_key_t key)
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/*
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* ------------------------------------------------------
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* DOCPUBLIC
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* This function deletes a thread-specific data key. This
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* does not change the value of the thread specific data key
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* for any thread and does not run the key's destructor
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* in any thread so it should be used with caution.
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*
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* PARAMETERS
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* key
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* pointer to an instance of pthread_key_t
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*
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*
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* DESCRIPTION
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* This function deletes a thread-specific data key. This
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* does not change the value of the thread specific data key
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* for any thread and does not run the key's destructor
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* in any thread so it should be used with caution.
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*
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* RESULTS
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* 0 successfully deleted the key,
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* EINVAL key is invalid,
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*
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* ------------------------------------------------------
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*/
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{
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ptw32_mcs_local_node_t keyLock;
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int result = 0;
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if (key != NULL)
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{
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if (key->threads != NULL && key->destructor != NULL)
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{
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ThreadKeyAssoc *assoc;
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ptw32_mcs_lock_acquire (&(key->keyLock), &keyLock);
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/*
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* Run through all Thread<-->Key associations
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* for this key.
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*
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* While we hold at least one of the locks guarding
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* the assoc, we know that the assoc pointed to by
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* key->threads is valid.
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*/
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while ((assoc = (ThreadKeyAssoc *) key->threads) != NULL)
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{
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ptw32_mcs_local_node_t threadLock;
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ptw32_thread_t * thread = assoc->thread;
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if (assoc == NULL)
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{
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/* Finished */
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break;
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}
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ptw32_mcs_lock_acquire (&(thread->threadLock), &threadLock);
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/*
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* Since we are starting at the head of the key's threads
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* chain, this will also point key->threads at the next assoc.
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* While we hold key->keyLock, no other thread can insert
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* a new assoc via pthread_setspecific.
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*/
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ptw32_tkAssocDestroy (assoc);
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ptw32_mcs_lock_release (&threadLock);
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ptw32_mcs_lock_release (&keyLock);
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}
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}
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TlsFree (key->key);
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if (key->destructor != NULL)
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{
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/* A thread could be holding the keyLock */
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ptw32_mcs_lock_acquire (&(key->keyLock), &keyLock);
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ptw32_mcs_lock_release (&keyLock);
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}
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#if defined( _DEBUG )
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memset ((char *) key, 0, sizeof (*key));
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#endif
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free (key);
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}
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return (result);
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}
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