Remove ancient trunk folder from svn repository

[synfig.git] / ETL / ETL / _rwlock.h

diff --git a/ETL/ETL/_rwlock.h b/ETL/ETL/_rwlock.h
new file mode 100644 (file)
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--- /dev/null
+++ b/ETL/ETL/_rwlock.h
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+/*! ========================================================================
+** Extended Template and Library
+** Mutex Abstraction Class Implementation
+** $Id$
+**
+** Copyright (c) 2002 Robert B. Quattlebaum Jr.
+**
+** This package is free software; you can redistribute it and/or
+** modify it under the terms of the GNU General Public License as
+** published by the Free Software Foundation; either version 2 of
+** the License, or (at your option) any later version.
+**
+** This package 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
+** General Public License for more details.
+**
+** === N O T E S ===========================================================
+**
+** This is an internal header file, included by other ETL headers.
+** You should not attempt to use it directly.
+**
+** ========================================================================= */
+
+/* === S T A R T =========================================================== */
+
+#ifndef __ETL__RWLOCK_H_
+#define __ETL__RWLOCK_H_
+
+/* === H E A D E R S ======================================================= */
+
+/* === M A C R O S ========================================================= */
+
+/* === C L A S S E S & S T R U C T S ======================================= */
+
+_ETL_BEGIN_NAMESPACE
+
+class read_write_lock : private Mutex
+{
+public:
+
+       read_write_lock()
+       {  }
+
+       ~read_write_lock()
+       {  }
+
+       //! Exception-safe read-lock class
+       class read_lock
+       {
+               read_write_lock *_mtx;
+       public:
+               read_lock(read_write_lock &x):_mtx(&x) { _mtx->lock_read(); }
+               ~read_lock() { _mtx->unlock_read(); }
+               read_write_lock &get() { return *_mtx; }
+       };
+
+       //! Exception-safe write-lock class
+       class write_lock
+       {
+               read_write_lock *_mtx;
+       public:
+               write_lock(read_write_lock &x):_mtx(&x) { _mtx->lock_write(); }
+               ~read_lock() { _mtx->unlock_write(); }
+               read_write_lock &get() { return *_mtx; }
+       };
+
+       void lock_read(void)
+       { lock_mutex(); }
+
+       void lock_write(void)
+       { lock_mutex(); }
+
+       bool try_lock_read(void)
+       { return try_lock_mutex(); }
+
+       bool try_lock_write(void)
+       { return try_lock_mutex(); }
+
+       void unlock_write(void)
+       { unlock_mutex(); }
+
+       void unlock_read(void)
+       { unlock_mutex(); }
+};
+
+_ETL_END_NAMESPACE
+
+/* === E X T E R N S ======================================================= */
+
+/* === E N D =============================================================== */
+
+#endif