sys/emulation/linux/linux_futex.h

   1 /*      $NetBSD: linux_futex.h,v 1.3 2008/10/126 16:38:22 christos Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2005 Emmanuel Dreyfus, all rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following 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  * 3. All advertising materials mentioning features or use of this software
  15  *    must display the following acknowledgement:
  16  *      This product includes software developed by Emmanuel Dreyfus
  17  * 4. The name of the author may not be used to endorse or promote
  18  *    products derived from this software without specific prior written
  19  *    permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE THE AUTHOR AND CONTRIBUTORS ``AS IS''
  22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  23  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  24  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
  25  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31  * POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef _LINUX_FUTEX_H
  35 #define _LINUX_FUTEX_H
  36
  37 extern LIST_HEAD(futex_list, futex) futex_list;
  38 extern struct lock futex_lock;
  39
  40 #define LINUX_FUTEX_WAIT        0
  41 #define LINUX_FUTEX_WAKE        1
  42 #define LINUX_FUTEX_FD          2       /* unused */
  43 #define LINUX_FUTEX_REQUEUE     3
  44 #define LINUX_FUTEX_CMP_REQUEUE 4
  45 #define LINUX_FUTEX_WAKE_OP     5
  46
  47 /* XXX: what are these? netbsd doesn't have them */
  48 #define LINUX_FUTEX_LOCK_PI     6
  49 #define LINUX_FUTEX_UNLOCK_PI   7
  50 #define LINUX_FUTEX_TRYLOCK_PI  8
  51
  52 #define LINUX_FUTEX_PRIVATE_FLAG        128
  53
  54 #define FUTEX_OP_SET            0       /* *(int *)UADDR2 = OPARG; */
  55 #define FUTEX_OP_ADD            1       /* *(int *)UADDR2 += OPARG; */
  56 #define FUTEX_OP_OR             2       /* *(int *)UADDR2 |= OPARG; */
  57 #define FUTEX_OP_ANDN           3       /* *(int *)UADDR2 &= ~OPARG; */
  58 #define FUTEX_OP_XOR            4       /* *(int *)UADDR2 ^= OPARG; */
  59
  60 #define FUTEX_OP_OPARG_SHIFT    8       /* Use (1 << OPARG) instead of OPARG.  */
  61
  62 #define FUTEX_OP_CMP_EQ         0       /* if (oldval == CMPARG) wake */
  63 #define FUTEX_OP_CMP_NE         1       /* if (oldval != CMPARG) wake */
  64 #define FUTEX_OP_CMP_LT         2       /* if (oldval < CMPARG) wake */
  65 #define FUTEX_OP_CMP_LE         3       /* if (oldval <= CMPARG) wake */
  66 #define FUTEX_OP_CMP_GT         4       /* if (oldval > CMPARG) wake */
  67 #define FUTEX_OP_CMP_GE         5       /* if (oldval >= CMPARG) wake */
  68
  69 #define FUTEX_WAITERS           0x80000000
  70 #define FUTEX_OWNER_DIED        0x40000000
  71 #define FUTEX_TID_MASK          0x3fffffff
  72
  73
  74 /* robust futexes */
  75 struct linux_robust_list {
  76         struct linux_robust_list        *next;
  77 };
  78
  79 struct linux_robust_list_head {
  80         struct linux_robust_list        list;
  81         l_long                          futex_offset;
  82         struct linux_robust_list        *pending_list;
  83 };
  84
  85 void    release_futexes(struct proc *);
  86 extern struct lock futex_mtx;
  87 #endif  /* !_LINUX_FUTEX_H */