| /* |
| * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org> |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``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 AUTHORS OR CONTRIBUTORS 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. |
| * |
| * $FreeBSD$ |
| */ |
| |
| #ifndef _OPENSOLARIS_SYS_RWLOCK_H_ |
| #define _OPENSOLARIS_SYS_RWLOCK_H_ |
| |
| #include <sys/param.h> |
| #include <sys/proc.h> |
| #include <sys/lock.h> |
| #include <sys/sx.h> |
| |
| typedef enum { |
| RW_DEFAULT = 4 /* kernel default rwlock */ |
| } krw_type_t; |
| |
| |
| typedef enum { |
| RW_NONE = 0, |
| RW_WRITER = 1, |
| RW_READER = 2 |
| } krw_t; |
| |
| typedef struct sx krwlock_t; |
| |
| #ifndef OPENSOLARIS_WITNESS |
| #define RW_FLAGS (SX_DUPOK | SX_NOWITNESS) |
| #else |
| #define RW_FLAGS (SX_DUPOK) |
| #endif |
| |
| #define RW_READ_HELD(x) (rw_read_held((x))) |
| #define RW_WRITE_HELD(x) (rw_write_held((x))) |
| #define RW_LOCK_HELD(x) (rw_lock_held((x))) |
| #define RW_ISWRITER(x) (rw_iswriter(x)) |
| /* BEGIN CSTYLED */ |
| #define rw_init(lock, desc, type, arg) do { \ |
| const char *_name; \ |
| ASSERT((type) == 0 || (type) == RW_DEFAULT); \ |
| KASSERT(((lock)->lock_object.lo_flags & LO_ALLMASK) != \ |
| LO_EXPECTED, ("lock %s already initialized", #lock)); \ |
| bzero((lock), sizeof(struct sx)); \ |
| for (_name = #lock; *_name != '\0'; _name++) { \ |
| if (*_name >= 'a' && *_name <= 'z') \ |
| break; \ |
| } \ |
| if (*_name == '\0') \ |
| _name = #lock; \ |
| sx_init_flags((lock), _name, RW_FLAGS); \ |
| } while (0) |
| #define rw_destroy(lock) sx_destroy(lock) |
| #define rw_enter(lock, how) do { \ |
| if ((how) == RW_READER) \ |
| sx_slock(lock); \ |
| else /* if ((how) == RW_WRITER) */ \ |
| sx_xlock(lock); \ |
| } while (0) |
| |
| #define rw_tryenter(lock, how) \ |
| ((how) == RW_READER ? sx_try_slock(lock) : sx_try_xlock(lock)) |
| #define rw_exit(lock) sx_unlock(lock) |
| #define rw_downgrade(lock) sx_downgrade(lock) |
| #define rw_tryupgrade(lock) sx_try_upgrade(lock) |
| #define rw_read_held(lock) \ |
| ((lock)->sx_lock != SX_LOCK_UNLOCKED && \ |
| ((lock)->sx_lock & SX_LOCK_SHARED)) |
| #define rw_write_held(lock) sx_xlocked(lock) |
| #define rw_lock_held(lock) (rw_read_held(lock) || rw_write_held(lock)) |
| #define rw_iswriter(lock) sx_xlocked(lock) |
| #define rw_owner(lock) sx_xholder(lock) |
| |
| /* END CSTYLED */ |
| #endif /* _OPENSOLARIS_SYS_RWLOCK_H_ */ |