1 files changed, 80 insertions, 0 deletions
diff --git a/src/libstrongswan/threading/rwlock.h b/src/libstrongswan/threading/rwlock.h
new file mode 100644
index 000000000..a86a241c5
--- /dev/null
+++ b/src/libstrongswan/threading/rwlock.h
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2008-2009 Tobias Brunner
+ * Copyright (C) 2008 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program 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.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program 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.
+ */
+
+/**
+ * @defgroup rwlock rwlock
+ * @{ @ingroup threading
+ */
+
+#ifndef THREADING_RWLOCK_H_
+#define THREADING_RWLOCK_H_
+
+typedef struct rwlock_t rwlock_t;
+typedef enum rwlock_type_t rwlock_type_t;
+
+/**
+ * Type of read-write lock.
+ */
+enum rwlock_type_t {
+	/** default condvar */
+	RWLOCK_TYPE_DEFAULT = 0,
+};
+
+/**
+ * Read-Write lock wrapper.
+ */
+struct rwlock_t {
+
+	/**
+	 * Acquire the read lock.
+	 */
+	void (*read_lock)(rwlock_t *this);
+
+	/**
+	 * Acquire the write lock.
+	 */
+	void (*write_lock)(rwlock_t *this);
+
+	/**
+	 * Try to acquire the write lock.
+	 *
+	 * Never blocks, but returns FALSE if the lock was already occupied.
+	 *
+	 * @return		TRUE if lock acquired
+	 */
+	bool (*try_write_lock)(rwlock_t *this);
+
+	/**
+	 * Release any acquired lock.
+	 */
+	void (*unlock)(rwlock_t *this);
+
+	/**
+	 * Destroy the read-write lock.
+	 */
+	void (*destroy)(rwlock_t *this);
+};
+
+/**
+ * Create a read-write lock instance.
+ *
+ * @param type		type of rwlock to create
+ * @return			unlocked rwlock instance
+ */
+rwlock_t *rwlock_create(rwlock_type_t type);
+
+#endif /** THREADING_RWLOCK_H_ @} */
+