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Diffstat (limited to 'pthreads/pthread_key_delete.c')
| -rw-r--r-- | pthreads/pthread_key_delete.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/pthreads/pthread_key_delete.c b/pthreads/pthread_key_delete.c new file mode 100644 index 000000000..7da9b2fb6 --- /dev/null +++ b/pthreads/pthread_key_delete.c @@ -0,0 +1,133 @@ +/* + * 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) + { + ThreadKeyAssoc *assoc; + /* + * 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_thread_t * thread = assoc->thread; + + if (assoc == NULL) + { + /* Finished */ + break; + } + + if (pthread_mutex_lock (&(thread->threadLock)) == 0) + { + /* + * 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 via pthread_setspecific. + */ + ptw32_tkAssocDestroy (assoc); + (void) pthread_mutex_unlock (&(thread->threadLock)); + } + else + { + /* Thread or lock is no longer valid? */ + ptw32_tkAssocDestroy (assoc); + } + } + pthread_mutex_unlock (&(key->keyLock)); + } + + TlsFree (key->key); + if (key->destructor != NULL) + { + /* A thread could be holding the keyLock */ + while (EBUSY == pthread_mutex_destroy (&(key->keyLock))) + { + Sleep(1); // Ugly. + } + } + +#if defined( _DEBUG ) + memset ((char *) key, 0, sizeof (*key)); +#endif + free (key); + } + + return (result); +} |