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_mutex_destroy.c | 148 +++++++++++++++++++++++++++++++++++
 1 file changed, 148 insertions(+)
 create mode 100644 pthreads/src/pthread_mutex_destroy.c

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

diff --git a/pthreads/src/pthread_mutex_destroy.c b/pthreads/src/pthread_mutex_destroy.c
new file mode 100644
index 0000000..7b8c9cd
--- /dev/null
+++ b/pthreads/src/pthread_mutex_destroy.c
@@ -0,0 +1,148 @@
+/*
+ * pthread_mutex_destroy.c
+ *
+ * Description:
+ * This translation unit implements mutual exclusion (mutex) primitives.
+ *
+ * --------------------------------------------------------------------------
+ *
+ *      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_mutex_destroy (pthread_mutex_t * mutex)
+{
+  int result = 0;
+  pthread_mutex_t mx;
+
+  /*
+   * Let the system deal with invalid pointers.
+   */
+
+  /*
+   * Check to see if we have something to delete.
+   */
+  if (*mutex < PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
+    {
+      mx = *mutex;
+
+      result = pthread_mutex_trylock (&mx);
+
+      /*
+       * If trylock succeeded and the mutex is not recursively locked it
+       * can be destroyed.
+       */
+      if (0 == result || ENOTRECOVERABLE == result)
+	{
+	  if (mx->kind != PTHREAD_MUTEX_RECURSIVE || 1 == mx->recursive_count)
+	    {
+	      /*
+	       * FIXME!!!
+	       * The mutex isn't held by another thread but we could still
+	       * be too late invalidating the mutex below since another thread
+	       * may already have entered mutex_lock and the check for a valid
+	       * *mutex != NULL.
+	       */
+	      *mutex = NULL;
+
+	      result = (0 == result)?pthread_mutex_unlock(&mx):0;
+
+	      if (0 == result)
+		{
+                  if (mx->robustNode != NULL)
+                    {
+                      free(mx->robustNode);
+                    }
+		  if (!CloseHandle (mx->event))
+		    {
+		      *mutex = mx;
+		      result = EINVAL;
+		    }
+		  else
+		    {
+		      free (mx);
+		    }
+		}
+	      else
+		{
+		  /*
+		   * Restore the mutex before we return the error.
+		   */
+		  *mutex = mx;
+		}
+	    }
+	  else			/* mx->recursive_count > 1 */
+	    {
+	      /*
+	       * The mutex must be recursive and already locked by us (this thread).
+	       */
+	      mx->recursive_count--;	/* Undo effect of pthread_mutex_trylock() above */
+	      result = EBUSY;
+	    }
+	}
+    }
+  else
+    {
+      ptw32_mcs_local_node_t node;
+
+      /*
+       * See notes in ptw32_mutex_check_need_init() above also.
+       */
+
+      ptw32_mcs_lock_acquire(&ptw32_mutex_test_init_lock, &node);
+
+      /*
+       * Check again.
+       */
+      if (*mutex >= PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
+	{
+	  /*
+	   * This is all we need to do to destroy a statically
+	   * initialised mutex that has not yet been used (initialised).
+	   * If we get to here, another thread
+	   * waiting to initialise this mutex will get an EINVAL.
+	   */
+	  *mutex = NULL;
+	}
+      else
+	{
+	  /*
+	   * The mutex has been initialised while we were waiting
+	   * so assume it's in use.
+	   */
+	  result = EBUSY;
+	}
+      ptw32_mcs_lock_release(&node);
+    }
+
+  return (result);
+}
-- 
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