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_spin_destroy.c | 111 ++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 pthreads/src/pthread_spin_destroy.c

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

diff --git a/pthreads/src/pthread_spin_destroy.c b/pthreads/src/pthread_spin_destroy.c
new file mode 100644
index 0000000..786c4e3
--- /dev/null
+++ b/pthreads/src/pthread_spin_destroy.c
@@ -0,0 +1,111 @@
+/*
+ * pthread_spin_destroy.c
+ *
+ * Description:
+ * This translation unit implements spin lock 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_spin_destroy (pthread_spinlock_t * lock)
+{
+  register pthread_spinlock_t s;
+  int result = 0;
+
+  if (lock == NULL || *lock == NULL)
+    {
+      return EINVAL;
+    }
+
+  if ((s = *lock) != PTHREAD_SPINLOCK_INITIALIZER)
+    {
+      if (s->interlock == PTW32_SPIN_USE_MUTEX)
+	{
+	  result = pthread_mutex_destroy (&(s->u.mutex));
+	}
+      else if ((PTW32_INTERLOCKED_LONG) PTW32_SPIN_UNLOCKED !=
+	       PTW32_INTERLOCKED_COMPARE_EXCHANGE_LONG ((PTW32_INTERLOCKED_LONGPTR) &s->interlock,
+						   (PTW32_INTERLOCKED_LONG) PTW32_SPIN_INVALID,
+						   (PTW32_INTERLOCKED_LONG) PTW32_SPIN_UNLOCKED))
+	{
+	  result = EINVAL;
+	}
+
+      if (0 == result)
+	{
+	  /*
+	   * We are relying on the application to ensure that all other threads
+	   * have finished with the spinlock before destroying it.
+	   */
+	  *lock = NULL;
+	  (void) free (s);
+	}
+    }
+  else
+    {
+      /*
+       * See notes in ptw32_spinlock_check_need_init() above also.
+       */
+      ptw32_mcs_local_node_t node;
+
+      ptw32_mcs_lock_acquire(&ptw32_spinlock_test_init_lock, &node);
+
+      /*
+       * Check again.
+       */
+      if (*lock == PTHREAD_SPINLOCK_INITIALIZER)
+	{
+	  /*
+	   * This is all we need to do to destroy a statically
+	   * initialised spinlock that has not yet been used (initialised).
+	   * If we get to here, another thread
+	   * waiting to initialise this mutex will get an EINVAL.
+	   */
+	  *lock = NULL;
+	}
+      else
+	{
+	  /*
+	   * The spinlock has been initialised while we were waiting
+	   * so assume it's in use.
+	   */
+	  result = EBUSY;
+	}
+
+       ptw32_mcs_lock_release(&node);
+    }
+
+  return (result);
+}
-- 
cgit v1.2.3