X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=ETL%2FETL%2F_rwlock.h;fp=ETL%2FETL%2F_rwlock.h;h=930db268fd3527962a53e1e339e68a664fa65bac;hb=a095981e18cc37a8ecc7cd237cc22b9c10329264;hp=0000000000000000000000000000000000000000;hpb=9459638ad6797b8139f1e9f0715c96076dbf0890;p=synfig.git

diff --git a/ETL/ETL/_rwlock.h b/ETL/ETL/_rwlock.h
new file mode 100644
index 0000000..930db26
--- /dev/null
+++ b/ETL/ETL/_rwlock.h
@@ -0,0 +1,93 @@
+/*! ========================================================================
+** 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