socketvar2.h

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1990, 1993
    3  *      The Regents of the University of California.  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  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  * @(#)socketvar.h      8.3 (Berkeley) 2/19/95
   34  * $FreeBSD: src/sys/sys/socketvar.h,v 1.46.2.10 2003/08/24 08:24:39 hsu Exp $
   35  */
   36 
   37 #ifndef _SYS_SOCKETVAR2_H_
   38 #define _SYS_SOCKETVAR2_H_
   39 
   40 #ifndef _SYS_SOCKETVAR_H_
   41 #include <sys/socketvar.h>
   42 #endif
   43 #ifndef _SYS_SYSTM_H_
   44 #include <sys/systm.h>
   45 #endif
   46 #ifndef _SYS_MALLOC_H_
   47 #include <sys/malloc.h>
   48 #endif
   49 #include <machine/atomic.h>
   50 
   51 /*
   52  * Acquire a lock on a signalsockbuf, sleep if the lock is already held.
   53  * The sleep is interruptable unless SSB_NOINTR is set in the ssb.
   54  *
   55  * We also acquire the token on success.  This token is used to interlock
   56  * frontend/backend operations until the sockbuf itself can be made mpsafe.
   57  *
   58  * Returns 0 on success, non-zero if the lock could not be acquired.
   59  */
   60 static __inline int
   61 ssb_lock(struct signalsockbuf *ssb, int wf)
   62 {
   63         uint32_t flags;
   64 
   65         for (;;) {
   66                 flags = ssb->ssb_flags;
   67                 cpu_ccfence();
   68                 if (flags & SSB_LOCK) {
   69                         if (wf == M_WAITOK)
   70                                 return _ssb_lock(ssb);
   71                         return EWOULDBLOCK;
   72                 }
   73                 if (atomic_cmpset_int(&ssb->ssb_flags, flags, flags|SSB_LOCK)) {
   74                         lwkt_gettoken(&ssb->ssb_token);
   75                         return(0);
   76                 }
   77         }
   78 }
   79 
   80 /*
   81  * Release a previously acquired lock on a signalsockbuf.
   82  *
   83  * Interlocked wakeup if SSB_WANT was also set.
   84  */
   85 static __inline void
   86 ssb_unlock(struct signalsockbuf *ssb)
   87 {
   88         uint32_t flags;
   89 
   90         KKASSERT(ssb->ssb_flags & SSB_LOCK);
   91         lwkt_reltoken(&ssb->ssb_token);
   92         for (;;) {
   93                 flags = ssb->ssb_flags;
   94                 cpu_ccfence();
   95                 if (atomic_cmpset_int(&ssb->ssb_flags, flags,
   96                                       flags & ~(SSB_LOCK | SSB_WANT))) {
   97                         if (flags & SSB_WANT)
   98                                 wakeup(&ssb->ssb_flags);
   99                         break;
  100                 }
  101         }
  102 }
  103 
  104 static __inline void
  105 sosetstate(struct socket *so, short state)
  106 {
  107         atomic_set_short(&so->so_state, state);
  108 }
  109 
  110 static __inline void
  111 soclrstate(struct socket *so, short state)
  112 {
  113         atomic_clear_short(&so->so_state, state);
  114 }
  115 
  116 static __inline void
  117 soreference(struct socket *so)
  118 {
  119         atomic_add_int(&so->so_refs, 1);
  120 }
  121 
  122 #endif

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FreeBSD/Linux Kernel Cross Reference sys/sys/socketvar2.h

FreeBSD/Linux Kernel Cross Reference
sys/sys/socketvar2.h