rwlock.h revision 219820
1219820Sjeff/*- 2219820Sjeff * Copyright (c) 2010 Isilon Systems, Inc. 3219820Sjeff * Copyright (c) 2010 iX Systems, Inc. 4219820Sjeff * Copyright (c) 2010 Panasas, Inc. 5219820Sjeff * All rights reserved. 6219820Sjeff * 7219820Sjeff * Redistribution and use in source and binary forms, with or without 8219820Sjeff * modification, are permitted provided that the following conditions 9219820Sjeff * are met: 10219820Sjeff * 1. Redistributions of source code must retain the above copyright 11219820Sjeff * notice unmodified, this list of conditions, and the following 12219820Sjeff * disclaimer. 13219820Sjeff * 2. Redistributions in binary form must reproduce the above copyright 14219820Sjeff * notice, this list of conditions and the following disclaimer in the 15219820Sjeff * documentation and/or other materials provided with the distribution. 16219820Sjeff * 17219820Sjeff * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18219820Sjeff * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19219820Sjeff * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20219820Sjeff * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21219820Sjeff * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22219820Sjeff * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23219820Sjeff * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24219820Sjeff * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25219820Sjeff * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26219820Sjeff * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27219820Sjeff */ 28219820Sjeff#ifndef _LINUX_RWLOCK_H_ 29219820Sjeff#define _LINUX_RWLOCK_H_ 30219820Sjeff 31219820Sjeff#include <sys/lock.h> 32219820Sjeff#include <sys/rwlock.h> 33219820Sjeff 34219820Sjefftypedef struct { 35219820Sjeff struct rwlock rw; 36219820Sjeff} rwlock_t; 37219820Sjeff 38219820Sjeff#define read_lock(_l) rw_rlock(&(_l)->rw) 39219820Sjeff#define write_lock(_l) rw_wlock(&(_l)->rw) 40219820Sjeff#define read_unlock(_l) rw_runlock(&(_l)->rw) 41219820Sjeff#define write_unlock(_l) rw_wunlock(&(_l)->rw) 42219820Sjeff#define read_lock_irq(lock) read_lock((lock)) 43219820Sjeff#define read_unlock_irq(lock) read_unlock((lock)) 44219820Sjeff#define write_lock_irq(lock) write_lock((lock)) 45219820Sjeff#define write_unlock_irq(lock) write_unlock((lock)) 46219820Sjeff#define read_lock_irqsave(lock, flags) \ 47219820Sjeff do {(flags) = 0; read_lock(lock); } while (0) 48219820Sjeff#define write_lock_irqsave(lock, flags) \ 49219820Sjeff do {(flags) = 0; write_lock(lock); } while (0) 50219820Sjeff#define read_unlock_irqrestore(lock, flags) \ 51219820Sjeff do { read_unlock(lock); } while (0) 52219820Sjeff#define write_unlock_irqrestore(lock, flags) \ 53219820Sjeff do { write_unlock(lock); } while (0) 54219820Sjeff 55219820Sjeffstatic inline void 56219820Sjeffrwlock_init(rwlock_t *lock) 57219820Sjeff{ 58219820Sjeff 59219820Sjeff memset(&lock->rw, 0, sizeof(lock->rw)); 60219820Sjeff rw_init_flags(&lock->rw, "lnxrw", RW_NOWITNESS); 61219820Sjeff} 62219820Sjeff 63219820Sjeff#endif /* _LINUX_RWLOCK_H_ */ 64