first commit

include/QxMemLeak/class_level_lock.h

@@ -0,0 +1,139 @@
+// -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
+// vim:tabstop=4:shiftwidth=4:expandtab:
+
+/*
+ * Copyright (C) 2004-2008 Wu Yongwei <adah at users dot sourceforge dot net>
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any
+ * damages arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute
+ * it freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must
+ *    not claim that you wrote the original software.  If you use this
+ *    software in a product, an acknowledgement in the product
+ *    documentation would be appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must
+ *    not be misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source
+ *    distribution.
+ *
+ * This file is part of Stones of Nvwa:
+ *      http://sourceforge.net/projects/nvwa
+ *
+ */
+
+/*!
+ * \file    class_level_lock.h
+ * \ingroup QxMemLeak
+ *
+ * In essence Loki ClassLevelLockable re-engineered to use a fast_mutex class.
+ *
+ * \version 1.13, 2007/12/30
+ * \author  Wu Yongwei
+ *
+ */
+
+#ifndef QT_NO_DEBUG
+#ifndef _QX_MODE_RELEASE
+#if _QX_USE_MEM_LEAK_DETECTION
+
+#ifndef _CLASS_LEVEL_LOCK_H
+#define _CLASS_LEVEL_LOCK_H
+
+#ifdef _MSC_VER
+#pragma once
+#endif
+
+#include "fast_mutex.h"
+
+namespace qx {
+namespace memory {
+
+#ifdef _NOTHREADS
+    /**
+     * Helper class for class-level locking.  This is the
+     * single-threaded implementation.
+     */
+    template <class _Host, bool _RealLock = false>
+    class class_level_lock
+    {
+    public:
+        /** Type that provides locking/unlocking semantics. */
+        class lock
+        {
+        public:
+            lock() {}
+        };
+
+        typedef _Host volatile_type;
+    };
+#else
+    /**
+     * Helper class for class-level locking.  This is the multi-threaded
+     * implementation.  The main departure from Loki ClassLevelLockable
+     * is that there is an additional template parameter which can make
+     * the lock not lock at all even in multi-threaded environments.
+     * See static_mem_pool.h for real usage.
+     */
+    template <class _Host, bool _RealLock = true>
+    class class_level_lock
+    {
+        static fast_mutex _S_mtx;
+
+    public:
+        class lock;
+        friend class lock;
+
+        /** Type that provides locking/unlocking semantics. */
+        class lock
+        {
+            lock(const lock&);
+            lock& operator=(const lock&);
+        public:
+            lock()
+            {
+                if (_RealLock)
+                    _S_mtx.lock();
+            }
+            ~lock()
+            {
+                if (_RealLock)
+                    _S_mtx.unlock();
+            }
+        };
+
+        typedef volatile _Host volatile_type;
+    };
+
+#if HAVE_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION
+    /** Partial specialization that makes null locking. */
+    template <class _Host>
+    class class_level_lock<_Host, false>
+    {
+    public:
+        /** Type that provides locking/unlocking semantics. */
+        class lock
+        {
+        public:
+            lock() {}
+        };
+
+        typedef _Host volatile_type;
+    };
+#endif // HAVE_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION
+
+    template <class _Host, bool _RealLock>
+    fast_mutex class_level_lock<_Host, _RealLock>::_S_mtx;
+#endif // _NOTHREADS
+
+} // namespace memory
+} // namespace qx
+
+#endif // _CLASS_LEVEL_LOCK_H
+#endif // _QX_USE_MEM_LEAK_DETECTION
+#endif // _QX_MODE_RELEASE
+#endif // QT_NO_DEBUG