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_barrier_destroy.c | 103 +++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 pthreads/src/pthread_barrier_destroy.c

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

diff --git a/pthreads/src/pthread_barrier_destroy.c b/pthreads/src/pthread_barrier_destroy.c
new file mode 100644
index 0000000..55163cc
--- /dev/null
+++ b/pthreads/src/pthread_barrier_destroy.c
@@ -0,0 +1,103 @@
+/*
+ * pthread_barrier_destroy.c
+ *
+ * Description:
+ * This translation unit implements barrier 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_barrier_destroy (pthread_barrier_t * barrier)
+{
+  int result = 0;
+  pthread_barrier_t b;
+  ptw32_mcs_local_node_t node;
+
+  if (barrier == NULL || *barrier == (pthread_barrier_t) PTW32_OBJECT_INVALID)
+    {
+      return EINVAL;
+    }
+
+  if (0 != ptw32_mcs_lock_try_acquire(&(*barrier)->lock, &node))
+    {
+      return EBUSY;
+    }
+
+  b = *barrier;
+
+  if (b->nCurrentBarrierHeight < b->nInitialBarrierHeight)
+    {
+      result = EBUSY;
+    }
+  else
+	{
+      if (0 == (result = sem_destroy (&(b->semBarrierBreeched))))
+        {
+          *barrier = (pthread_barrier_t) PTW32_OBJECT_INVALID;
+          /*
+           * Release the lock before freeing b.
+           *
+           * FIXME: There may be successors which, when we release the lock,
+           * will be linked into b->lock, which will be corrupted at some
+           * point with undefined results for the application. To fix this
+           * will require changing pthread_barrier_t from a pointer to
+           * pthread_barrier_t_ to an instance. This is a change to the ABI
+           * and will require a major version number increment.
+           */
+          ptw32_mcs_lock_release(&node);
+	  (void) free (b);
+	  return 0;
+	}
+      else
+        {
+          /*
+           * This should not ever be reached.
+           * Restore the barrier to working condition before returning.
+           */
+          (void) sem_init (&(b->semBarrierBreeched), b->pshared, 0);
+        }
+
+      if (result != 0)
+        {
+          /*
+           * The barrier still exists and is valid
+           * in the event of any error above.
+           */
+          result = EBUSY;
+        }
+    }
+
+  ptw32_mcs_lock_release(&node);
+  return (result);
+}
-- 
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