rwsem.h

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    1 /*-
    2  * Copyright (c) 2010 Isilon Systems, Inc.
    3  * Copyright (c) 2010 iX Systems, Inc.
    4  * Copyright (c) 2010 Panasas, Inc.
    5  * Copyright (c) 2013-2017 Mellanox Technologies, Ltd.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice unmodified, this list of conditions, and the following
   13  *    disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  *
   29  * $FreeBSD$
   30  */
   31 #ifndef _LINUXKPI_LINUX_RWSEM_H_
   32 #define _LINUXKPI_LINUX_RWSEM_H_
   33 
   34 #include <sys/param.h>
   35 #include <sys/lock.h>
   36 #include <sys/sx.h>
   37 #include <sys/libkern.h>
   38 #include <sys/kernel.h>
   39 
   40 struct rw_semaphore {
   41         struct sx sx;
   42 };
   43 
   44 #define down_write(_rw)                 sx_xlock(&(_rw)->sx)
   45 #define up_write(_rw)                   sx_xunlock(&(_rw)->sx)
   46 #define down_read(_rw)                  sx_slock(&(_rw)->sx)
   47 #define up_read(_rw)                    sx_sunlock(&(_rw)->sx)
   48 #define down_read_trylock(_rw)          !!sx_try_slock(&(_rw)->sx)
   49 #define down_read_killable(_rw)         linux_down_read_killable(_rw)
   50 #define down_write_trylock(_rw)         !!sx_try_xlock(&(_rw)->sx)
   51 #define down_write_killable(_rw)        linux_down_write_killable(_rw)
   52 #define downgrade_write(_rw)            sx_downgrade(&(_rw)->sx)
   53 #define down_read_nested(_rw, _sc)      down_read(_rw)
   54 #define init_rwsem(_rw)                 linux_init_rwsem(_rw, rwsem_name("lnxrwsem"))
   55 #define down_write_nest_lock(sem, _rw)  down_write(_rw)
   56 
   57 #ifdef WITNESS_ALL
   58 /* NOTE: the maximum WITNESS name is 64 chars */
   59 #define __rwsem_name(name, file, line)          \
   60         (((const char *){file ":" #line "-" name}) +    \
   61         (sizeof(file) > 16 ? sizeof(file) - 16 : 0))
   62 #else
   63 #define __rwsem_name(name, file, line)  name
   64 #endif
   65 #define _rwsem_name(...)                __rwsem_name(__VA_ARGS__)
   66 #define rwsem_name(name)                _rwsem_name(name, __FILE__, __LINE__)
   67 
   68 #define DECLARE_RWSEM(name)                                             \
   69 struct rw_semaphore name;                                               \
   70 static void name##_rwsem_init(void *arg)                                \
   71 {                                                                       \
   72         linux_init_rwsem(&name, rwsem_name(#name));                     \
   73 }                                                                       \
   74 SYSINIT(name, SI_SUB_LOCK, SI_ORDER_SECOND, name##_rwsem_init, NULL)
   75 
   76 static inline void
   77 linux_init_rwsem(struct rw_semaphore *rw, const char *name)
   78 {
   79 
   80         memset(rw, 0, sizeof(*rw));
   81         sx_init_flags(&rw->sx, name, SX_NOWITNESS);
   82 }
   83 
   84 extern int linux_down_read_killable(struct rw_semaphore *);
   85 extern int linux_down_write_killable(struct rw_semaphore *);
   86 
   87 #endif                                  /* _LINUXKPI_LINUX_RWSEM_H_ */

Cache object: 4e638d25debab4b1ecbd0356f32cf44a

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

FreeBSD/Linux Kernel Cross Reference sys/compat/linuxkpi/common/include/linux/rwsem.h

FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/rwsem.h