From a416ab17ecf9f2cb0f1e3f7bd645a8d1ce690ca2 Mon Sep 17 00:00:00 2001
From: rpj <rpj>
Date: Mon, 18 Feb 2002 03:16:52 +0000
Subject: Major reorganisation of source code; new routine and tests added.

---
 pthread_spin_destroy.c | 102 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 pthread_spin_destroy.c

(limited to 'pthread_spin_destroy.c')

diff --git a/pthread_spin_destroy.c b/pthread_spin_destroy.c
new file mode 100644
index 0000000..1f61930
--- /dev/null
+++ b/pthread_spin_destroy.c
@@ -0,0 +1,102 @@
+/*
+ * 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) 1999,2002 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_spin_destroy(pthread_spinlock_t *lock)
+{
+  register pthread_spinlock_t s;
+
+  if (lock == NULL || *lock == NULL)
+    {
+      return EINVAL;
+    }
+
+  if ((s = *lock) != PTHREAD_SPINLOCK_INITIALIZER)
+    {
+      if (s->interlock == PTW32_SPIN_USE_MUTEX)
+        {
+          return pthread_mutex_destroy(&(s->u.mutex));
+        }
+
+      if ( (PTW32_INTERLOCKED_LONG) PTW32_SPIN_UNLOCKED ==
+           ptw32_interlocked_compare_exchange((PTW32_INTERLOCKED_LPLONG) &(s->interlock),
+                                              (PTW32_INTERLOCKED_LONG) PTW32_OBJECT_INVALID,
+                                              (PTW32_INTERLOCKED_LONG) PTW32_SPIN_UNLOCKED))
+        {
+          return 0;
+        }
+
+      return EINVAL;
+    }
+  else
+    {
+      int result = 0;
+
+      /*
+       * See notes in ptw32_spinlock_check_need_init() above also.
+       */
+      EnterCriticalSection(&ptw32_spinlock_test_init_lock);
+
+      /*
+       * 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;
+        }
+
+      LeaveCriticalSection(&ptw32_spinlock_test_init_lock);
+      return(result);
+    }
+}
-- 
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