0,0 → 1,83 |
/* |
* Copyright (c) 2001-2004 Jakub Jermar |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
/** @addtogroup sync |
* @{ |
*/ |
/** @file |
*/ |
|
#ifndef KERN_RWLOCK_H_ |
#define KERN_RWLOCK_H_ |
|
#include <arch/types.h> |
#include <synch/mutex.h> |
#include <synch/synch.h> |
#include <synch/spinlock.h> |
|
typedef enum { |
RWLOCK_NONE, |
RWLOCK_READER, |
RWLOCK_WRITER |
} rwlock_type_t; |
|
typedef struct { |
SPINLOCK_DECLARE(lock); |
/** |
* Mutex for writers, readers can bypass it if readers_in is positive. |
*/ |
mutex_t exclusive; |
/** Number of readers in critical section. */ |
count_t readers_in; |
} rwlock_t; |
|
#define rwlock_write_lock(rwl) \ |
_rwlock_write_lock_timeout((rwl), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE) |
#define rwlock_read_lock(rwl) \ |
_rwlock_read_lock_timeout((rwl), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE) |
#define rwlock_write_trylock(rwl) \ |
_rwlock_write_lock_timeout((rwl), SYNCH_NO_TIMEOUT, \ |
SYNCH_FLAGS_NON_BLOCKING) |
#define rwlock_read_trylock(rwl) \ |
_rwlock_read_lock_timeout((rwl), SYNCH_NO_TIMEOUT, \ |
SYNCH_FLAGS_NON_BLOCKING) |
#define rwlock_write_lock_timeout(rwl, usec) \ |
_rwlock_write_lock_timeout((rwl), (usec), SYNCH_FLAGS_NONE) |
#define rwlock_read_lock_timeout(rwl, usec) \ |
_rwlock_read_lock_timeout((rwl), (usec), SYNCH_FLAGS_NONE) |
|
extern void rwlock_initialize(rwlock_t *rwl); |
extern void rwlock_read_unlock(rwlock_t *rwl); |
extern void rwlock_write_unlock(rwlock_t *rwl); |
extern int _rwlock_read_lock_timeout(rwlock_t *rwl, uint32_t usec, int flags); |
extern int _rwlock_write_lock_timeout(rwlock_t *rwl, uint32_t usec, int flags); |
|
#endif |
|
/** @} |
*/ |