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/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* 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 version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
* GPL HEADER END
*/
/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* libcfs/include/libcfs/linux/linux-lock.h
*
* Basic library routines.
*/
#ifndef __LIBCFS_LINUX_CFS_LOCK_H__
#define __LIBCFS_LINUX_CFS_LOCK_H__
#ifndef __LIBCFS_LIBCFS_H__
#error Do not #include this file directly. #include <linux/libcfs/libcfs.h> instead
#endif
#include <linux/mutex.h>
/*
* IMPORTANT !!!!!!!!
*
* All locks' declaration are not guaranteed to be initialized,
* although some of them are initialized in Linux. All locks
* declared by CFS_DECL_* should be initialized explicitly.
*/
/*
* spin_lock "implementation" (use Linux kernel's primitives)
*
* - spin_lock_init(x)
* - spin_lock(x)
* - spin_lock_bh(x)
* - spin_lock_bh_init(x)
* - spin_unlock(x)
* - spin_unlock_bh(x)
* - spin_trylock(x)
* - spin_is_locked(x)
*
* - spin_lock_irq(x)
* - spin_lock_irqsave(x, f)
* - spin_unlock_irqrestore(x, f)
* - read_lock_irqsave(lock, f)
* - write_lock_irqsave(lock, f)
* - write_unlock_irqrestore(lock, f)
*/
/*
* spinlock "implementation"
*/
/*
* rw_semaphore "implementation" (use Linux kernel's primitives)
*
* - sema_init(x)
* - init_rwsem(x)
* - down_read(x)
* - up_read(x)
* - down_write(x)
* - up_write(x)
*/
#define fini_rwsem(s) do {} while (0)
/*
* rwlock_t "implementation" (use Linux kernel's primitives)
*
* - rwlock_init(x)
* - read_lock(x)
* - read_unlock(x)
* - write_lock(x)
* - write_unlock(x)
* - write_lock_bh(x)
* - write_unlock_bh(x)
*
* - RW_LOCK_UNLOCKED
*/
#ifndef DEFINE_RWLOCK
#define DEFINE_RWLOCK(lock) rwlock_t lock = __RW_LOCK_UNLOCKED(lock)
#endif
/*
* completion "implementation" (use Linux kernel's primitives)
*
* - DECLARE_COMPLETION(work)
* - INIT_COMPLETION(c)
* - COMPLETION_INITIALIZER(work)
* - init_completion(c)
* - complete(c)
* - wait_for_completion(c)
* - wait_for_completion_interruptible(c)
* - fini_completion(c)
*/
#define fini_completion(c) do { } while (0)
/*
* semaphore "implementation" (use Linux kernel's primitives)
* - DEFINE_SEMAPHORE(name)
* - sema_init(sem, val)
* - up(sem)
* - down(sem)
* - down_interruptible(sem)
* - down_trylock(sem)
*/
/*
* mutex "implementation" (use Linux kernel's primitives)
*
* - DEFINE_MUTEX(name)
* - mutex_init(x)
* - mutex_lock(x)
* - mutex_unlock(x)
* - mutex_trylock(x)
* - mutex_is_locked(x)
* - mutex_destroy(x)
*/
#ifndef lockdep_set_class
/**************************************************************************
*
* Lockdep "implementation". Also see liblustre.h
*
**************************************************************************/
struct lock_class_key {
;
};
#define lockdep_set_class(lock, key) \
do { (void)sizeof(lock); (void)sizeof(key); } while (0)
/* This has to be a macro, so that `subclass' can be undefined in kernels
* that do not support lockdep. */
static inline void lockdep_off(void)
{
}
static inline void lockdep_on(void)
{
}
#else
#endif /* lockdep_set_class */
#ifndef CONFIG_DEBUG_LOCK_ALLOC
#ifndef mutex_lock_nested
#define mutex_lock_nested(mutex, subclass) mutex_lock(mutex)
#endif
#ifndef spin_lock_nested
#define spin_lock_nested(lock, subclass) spin_lock(lock)
#endif
#ifndef down_read_nested
#define down_read_nested(lock, subclass) down_read(lock)
#endif
#ifndef down_write_nested
#define down_write_nested(lock, subclass) down_write(lock)
#endif
#endif /* CONFIG_DEBUG_LOCK_ALLOC */
#endif /* __LIBCFS_LINUX_CFS_LOCK_H__ */
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