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authorrpj <rpj>2002-02-18 03:16:52 +0000
committerrpj <rpj>2002-02-18 03:16:52 +0000
commita416ab17ecf9f2cb0f1e3f7bd645a8d1ce690ca2 (patch)
tree72f776cd64e48824a5578ff7a523bc69097143b4 /pthread_key_delete.c
parente6f1797e9e9925ae7f9dda54806ef8f52ae3ed07 (diff)
Major reorganisation of source code; new routine and tests added.
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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) 1999,2002 Pthreads-win32 contributors
+ *
+ * Contact Email: rpj@ise.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 spcific 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 spcific 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->threadsLock)) == 0)
+ {
+ /*
+ * Run through all Thread<-->Key associations
+ * for this key.
+ * If the pthread_t still exits (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)
+ {
+ if (pthread_mutex_lock (&(assoc->lock)) == 0)
+ {
+ ThreadKeyAssoc *next;
+
+ assoc->key = NULL;
+ next = assoc->nextThread;
+ assoc->nextThread = NULL;
+
+ pthread_mutex_unlock (&(assoc->lock));
+
+ ptw32_tkAssocDestroy (assoc);
+
+ assoc = next;
+ }
+ }
+ pthread_mutex_unlock (&(key->threadsLock));
+ }
+
+ TlsFree (key->key);
+ if (key->destructor != NULL)
+ {
+ pthread_mutex_destroy (&(key->threadsLock));
+ }
+
+#if defined( _DEBUG )
+ memset ((char *) key, 0, sizeof (*key));
+#endif
+ free (key);
+ }
+
+ return (result);
+}