umtx.h

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    1 /*
    2  * Copyright (c) 2002, Jeffrey Roberson <jeff@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 unmodified, this list of conditions, and the following
   10  *    disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/5.1/sys/sys/umtx.h 115784 2003-06-03 20:43:18Z jeff $
   27  *
   28  */
   29 
   30 #ifndef _SYS_UMTX_H_
   31 #define _SYS_UMTX_H_
   32 
   33 /* 
   34  * See pthread_*
   35  */
   36 
   37 #define UMTX_UNOWNED    NULL
   38 #define UMTX_CONTESTED  0x1
   39 
   40 
   41 struct umtx {
   42         thr_id_t u_owner;       /* Owner of the mutex. */
   43 };
   44 
   45 #ifndef _KERNEL
   46 
   47 /*
   48  * System calls for acquiring and releasing contested mutexes.
   49  */
   50 int _umtx_lock(struct umtx *mtx);
   51 int _umtx_unlock(struct umtx *mtx);
   52 
   53 /*
   54  * Standard api.  Try uncontested acquire/release and asks the
   55  * kernel to resolve failures.
   56  */
   57 static __inline int
   58 umtx_lock(struct umtx *umtx, thr_id_t id)
   59 {
   60         if (atomic_cmpset_acq_ptr(&umtx->u_owner, UMTX_UNOWNED, id) == 0)
   61                 if (_umtx_lock(umtx) == -1)
   62                         return (errno);
   63 
   64         return (0);
   65 }
   66 
   67 static __inline int
   68 umtx_trylock(struct umtx *umtx, thr_id_t id)
   69 {
   70         if (atomic_cmpset_acq_ptr(&umtx->u_owner, UMTX_UNOWNED, id) == 0)
   71                 return (EBUSY);
   72 
   73         return (0);
   74 }
   75 
   76 static __inline int
   77 umtx_unlock(struct umtx *umtx, thr_id_t id)
   78 {
   79         if (atomic_cmpset_rel_ptr(&umtx->u_owner, id, UMTX_UNOWNED) == 0)
   80                 if (_umtx_unlock(umtx) == -1)
   81                         return (errno);
   82         return (0);
   83 }
   84 #endif /* !_KERNEL */
   85 
   86 #endif /* !_SYS_UMTX_H_ */

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

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