rwlock.h

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    1 /*
    2  * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD$
   27  */
   28 
   29 #ifndef _OPENSOLARIS_SYS_RWLOCK_H_
   30 #define _OPENSOLARIS_SYS_RWLOCK_H_
   31 
   32 #include <sys/param.h>
   33 #include <sys/proc.h>
   34 #include <sys/lock.h>
   35 #include <sys/sx.h>
   36 
   37 typedef enum {
   38         RW_DEFAULT = 4          /* kernel default rwlock */
   39 } krw_type_t;
   40 
   41 
   42 typedef enum {
   43         RW_NONE         = 0,
   44         RW_WRITER       = 1,
   45         RW_READER       = 2
   46 } krw_t;
   47 
   48 typedef struct sx       krwlock_t;
   49 
   50 #ifndef OPENSOLARIS_WITNESS
   51 #define RW_FLAGS        (SX_DUPOK | SX_NEW | SX_NOWITNESS)
   52 #else
   53 #define RW_FLAGS        (SX_DUPOK | SX_NEW)
   54 #endif
   55 
   56 #define RW_READ_HELD(x)         (rw_read_held((x)))
   57 #define RW_WRITE_HELD(x)        (rw_write_held((x)))
   58 #define RW_LOCK_HELD(x)         (rw_lock_held((x)))
   59 #define RW_ISWRITER(x)          (rw_iswriter(x))
   60 #define rw_init(lock, desc, type, arg)  do {                            \
   61         const char *_name;                                              \
   62         ASSERT((type) == 0 || (type) == RW_DEFAULT);                    \
   63         for (_name = #lock; *_name != '\0'; _name++) {                  \
   64                 if (*_name >= 'a' && *_name <= 'z')                     \
   65                         break;                                          \
   66         }                                                               \
   67         if (*_name == '\0')                                             \
   68                 _name = #lock;                                          \
   69         sx_init_flags((lock), _name, RW_FLAGS);                         \
   70 } while (0)
   71 #define rw_destroy(lock)        sx_destroy(lock)
   72 #define rw_enter(lock, how)     do {                                    \
   73         if ((how) == RW_READER)                                         \
   74                 sx_slock(lock);                                         \
   75         else /* if ((how) == RW_WRITER) */                              \
   76                 sx_xlock(lock);                                         \
   77         } while (0)
   78 
   79 #define rw_tryenter(lock, how)                     \
   80         ((how) == RW_READER ? sx_try_slock(lock) : sx_try_xlock(lock))
   81 #define rw_exit(lock)           sx_unlock(lock)
   82 #define rw_downgrade(lock)      sx_downgrade(lock)
   83 #define rw_tryupgrade(lock)     sx_try_upgrade(lock)
   84 #define rw_read_held(lock)                                        \
   85         ((lock)->sx_lock != SX_LOCK_UNLOCKED &&   \
   86             ((lock)->sx_lock & SX_LOCK_SHARED))
   87 #define rw_write_held(lock)     sx_xlocked(lock)
   88 #define rw_lock_held(lock)      (rw_read_held(lock) || rw_write_held(lock))
   89 #define rw_iswriter(lock)       sx_xlocked(lock)
   90 #define rw_owner(lock)          sx_xholder(lock)
   91 
   92 #endif  /* _OPENSOLARIS_SYS_RWLOCK_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/include/os/freebsd/spl/sys/rwlock.h

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/os/freebsd/spl/sys/rwlock.h