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/*
* Copyright (C) 2008-2009 Tobias Brunner
* Copyright (C) 2008 Martin Willi
* HSR 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_ @} */
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