The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/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  * $FreeBSD$
   27  *
   28  */
   29 
   30 #ifndef _SYS_UMTX_H_
   31 #define _SYS_UMTX_H_
   32 
   33 /* 
   34  * See pthread_*
   35  */
   36 
   37 #define UMTX_UNOWNED    0x0
   38 
   39 struct umtx {
   40         void    *u_owner;       /* Owner of the mutex. */
   41 };
   42 
   43 #ifndef _KERNEL
   44 
   45 /*
   46  * System calls for acquiring and releasing contested mutexes.
   47  */
   48 int _umtx_lock(struct umtx *mtx);
   49 int _umtx_unlock(struct umtx *mtx);
   50 
   51 /*
   52  * Standard api.  Try uncontested acquire/release and asks the
   53  * kernel to resolve failures.
   54  */
   55 static __inline int
   56 umtx_lock(struct umtx *umtx, long id)
   57 {
   58         if (atomic_cmpset_acq_ptr(&umtx->u_owner, (void *)UMTX_UNOWNED,
   59             (void *)id) == 0)
   60                 if (_umtx_lock(umtx) == -1)
   61                         return (errno);
   62         return (0);
   63 }
   64 
   65 static __inline int
   66 umtx_trylock(struct umtx *umtx, long id)
   67 {
   68         if (atomic_cmpset_acq_ptr(&umtx->u_owner, (void *)UMTX_UNOWNED,
   69             (void *)id) == 0)
   70                 return (EBUSY);
   71         return (0);
   72 }
   73 
   74 static __inline int
   75 umtx_unlock(struct umtx *umtx, long id)
   76 {
   77         if (atomic_cmpset_rel_ptr(&umtx->u_owner, (void *)id,
   78             (void *)UMTX_UNOWNED) == 0)
   79                 if (_umtx_unlock(umtx) == -1)
   80                         return (errno);
   81         return (0);
   82 }
   83 #endif /* !_KERNEL */
   84 
   85 #endif /* !_SYS_UMTX_H_ */

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