1f0a75d27SPawel Jakub Dawidek /*- 2f0a75d27SPawel Jakub Dawidek * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3f0a75d27SPawel Jakub Dawidek * All rights reserved. 4f0a75d27SPawel Jakub Dawidek * 5f0a75d27SPawel Jakub Dawidek * Redistribution and use in source and binary forms, with or without 6f0a75d27SPawel Jakub Dawidek * modification, are permitted provided that the following conditions 7f0a75d27SPawel Jakub Dawidek * are met: 8f0a75d27SPawel Jakub Dawidek * 1. Redistributions of source code must retain the above copyright 9f0a75d27SPawel Jakub Dawidek * notice, this list of conditions and the following disclaimer. 10f0a75d27SPawel Jakub Dawidek * 2. Redistributions in binary form must reproduce the above copyright 11f0a75d27SPawel Jakub Dawidek * notice, this list of conditions and the following disclaimer in the 12f0a75d27SPawel Jakub Dawidek * documentation and/or other materials provided with the distribution. 13f0a75d27SPawel Jakub Dawidek * 14f0a75d27SPawel Jakub Dawidek * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15f0a75d27SPawel Jakub Dawidek * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16f0a75d27SPawel Jakub Dawidek * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17f0a75d27SPawel Jakub Dawidek * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18f0a75d27SPawel Jakub Dawidek * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19f0a75d27SPawel Jakub Dawidek * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20f0a75d27SPawel Jakub Dawidek * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21f0a75d27SPawel Jakub Dawidek * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22f0a75d27SPawel Jakub Dawidek * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23f0a75d27SPawel Jakub Dawidek * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24f0a75d27SPawel Jakub Dawidek * SUCH DAMAGE. 25f0a75d27SPawel Jakub Dawidek */ 26f0a75d27SPawel Jakub Dawidek 27f0a75d27SPawel Jakub Dawidek #ifndef _OPENSOLARIS_SYS_RWLOCK_H_ 28f0a75d27SPawel Jakub Dawidek #define _OPENSOLARIS_SYS_RWLOCK_H_ 29f0a75d27SPawel Jakub Dawidek 30f0a75d27SPawel Jakub Dawidek #include <sys/param.h> 31f0a75d27SPawel Jakub Dawidek #include <sys/proc.h> 32f0a75d27SPawel Jakub Dawidek #include <sys/lock.h> 33f0a75d27SPawel Jakub Dawidek #include <sys/sx.h> 34f0a75d27SPawel Jakub Dawidek 35f0a75d27SPawel Jakub Dawidek #ifdef _KERNEL 36f0a75d27SPawel Jakub Dawidek 37f0a75d27SPawel Jakub Dawidek typedef enum { 38f0a75d27SPawel Jakub Dawidek RW_DEFAULT = 4 /* kernel default rwlock */ 39f0a75d27SPawel Jakub Dawidek } krw_type_t; 40f0a75d27SPawel Jakub Dawidek 41f0a75d27SPawel Jakub Dawidek typedef enum { 42f0a75d27SPawel Jakub Dawidek RW_WRITER, 43f0a75d27SPawel Jakub Dawidek RW_READER 44f0a75d27SPawel Jakub Dawidek } krw_t; 45f0a75d27SPawel Jakub Dawidek 46f0a75d27SPawel Jakub Dawidek typedef struct sx krwlock_t; 47f0a75d27SPawel Jakub Dawidek 48c319ea15SAndriy Gapon #ifndef OPENSOLARIS_WITNESS 491ae1c2a3SAttilio Rao #define RW_FLAGS (SX_DUPOK | SX_NOWITNESS) 500d99488dSPawel Jakub Dawidek #else 511ae1c2a3SAttilio Rao #define RW_FLAGS (SX_DUPOK) 520d99488dSPawel Jakub Dawidek #endif 530d99488dSPawel Jakub Dawidek 54f0a75d27SPawel Jakub Dawidek #define RW_READ_HELD(x) (rw_read_held((x))) 55f0a75d27SPawel Jakub Dawidek #define RW_WRITE_HELD(x) (rw_write_held((x))) 56f0a75d27SPawel Jakub Dawidek #define RW_LOCK_HELD(x) (rw_lock_held((x))) 57f0a75d27SPawel Jakub Dawidek #define RW_ISWRITER(x) (rw_iswriter(x)) 58f0a75d27SPawel Jakub Dawidek 5924bda164SPawel Jakub Dawidek #define rw_init(lock, desc, type, arg) do { \ 60171eb887SPawel Jakub Dawidek const char *_name; \ 6110b9d77bSPawel Jakub Dawidek ASSERT((type) == 0 || (type) == RW_DEFAULT); \ 6224bda164SPawel Jakub Dawidek KASSERT(((lock)->lock_object.lo_flags & LO_ALLMASK) != \ 6324bda164SPawel Jakub Dawidek LO_EXPECTED, ("lock %s already initialized", #lock)); \ 6424bda164SPawel Jakub Dawidek bzero((lock), sizeof(struct sx)); \ 65171eb887SPawel Jakub Dawidek for (_name = #lock; *_name != '\0'; _name++) { \ 66171eb887SPawel Jakub Dawidek if (*_name >= 'a' && *_name <= 'z') \ 67171eb887SPawel Jakub Dawidek break; \ 68171eb887SPawel Jakub Dawidek } \ 69171eb887SPawel Jakub Dawidek if (*_name == '\0') \ 70171eb887SPawel Jakub Dawidek _name = #lock; \ 71171eb887SPawel Jakub Dawidek sx_init_flags((lock), _name, RW_FLAGS); \ 7224bda164SPawel Jakub Dawidek } while (0) 73f0a75d27SPawel Jakub Dawidek #define rw_destroy(lock) sx_destroy(lock) 74f0a75d27SPawel Jakub Dawidek #define rw_enter(lock, how) do { \ 75f0a75d27SPawel Jakub Dawidek if ((how) == RW_READER) \ 76f0a75d27SPawel Jakub Dawidek sx_slock(lock); \ 77f0a75d27SPawel Jakub Dawidek else /* if ((how) == RW_WRITER) */ \ 78f0a75d27SPawel Jakub Dawidek sx_xlock(lock); \ 79f0a75d27SPawel Jakub Dawidek } while (0) 80f0a75d27SPawel Jakub Dawidek #define rw_tryenter(lock, how) ((how) == RW_READER ? sx_try_slock(lock) : sx_try_xlock(lock)) 81f0a75d27SPawel Jakub Dawidek #define rw_exit(lock) sx_unlock(lock) 82f0a75d27SPawel Jakub Dawidek #define rw_downgrade(lock) sx_downgrade(lock) 83f0a75d27SPawel Jakub Dawidek #define rw_tryupgrade(lock) sx_try_upgrade(lock) 84f0a75d27SPawel Jakub Dawidek #define rw_read_held(lock) ((lock)->sx_lock != SX_LOCK_UNLOCKED && ((lock)->sx_lock & SX_LOCK_SHARED)) 85f0a75d27SPawel Jakub Dawidek #define rw_write_held(lock) sx_xlocked(lock) 86f0a75d27SPawel Jakub Dawidek #define rw_lock_held(lock) (rw_read_held(lock) || rw_write_held(lock)) 87f0a75d27SPawel Jakub Dawidek #define rw_iswriter(lock) sx_xlocked(lock) 889f247840SRyan Moeller #define rw_owner(lock) sx_xholder(lock) 89f0a75d27SPawel Jakub Dawidek 90f0a75d27SPawel Jakub Dawidek #endif /* defined(_KERNEL) */ 91f0a75d27SPawel Jakub Dawidek 92f0a75d27SPawel Jakub Dawidek #endif /* _OPENSOLARIS_SYS_RWLOCK_H_ */ 93