From 2ab3d99967d68c79351fe2a3df22c445447e3010 Mon Sep 17 00:00:00 2001
From: Michał Cichoń <michcic@gmail.com>
Date: Tue, 15 Nov 2011 22:28:48 +0100
Subject: Initial import.

---
 pthreads/src/pthread_key_delete.c | 125 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 pthreads/src/pthread_key_delete.c

(limited to 'pthreads/src/pthread_key_delete.c')

diff --git a/pthreads/src/pthread_key_delete.c b/pthreads/src/pthread_key_delete.c
new file mode 100644
index 0000000..09d70c6
--- /dev/null
+++ b/pthreads/src/pthread_key_delete.c
@@ -0,0 +1,125 @@
+/*
+ * 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,
+      *
+      * ------------------------------------------------------
+      */
+{
+  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 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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