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: releng/11.1/sys/sys/umtx.h 300043 2016-05-17 09:56:22Z kib $
   27  *
   28  */
   29 
   30 #ifndef _SYS_UMTX_H_
   31 #define _SYS_UMTX_H_
   32 
   33 #include <sys/_umtx.h>
   34 
   35 /* Common lock flags */
   36 #define USYNC_PROCESS_SHARED    0x0001  /* Process shared sync objs */
   37 
   38 /* umutex flags */
   39 #define UMUTEX_PRIO_INHERIT     0x0004  /* Priority inherited mutex */
   40 #define UMUTEX_PRIO_PROTECT     0x0008  /* Priority protect mutex */
   41 #define UMUTEX_ROBUST           0x0010  /* Robust mutex */
   42 #define UMUTEX_NONCONSISTENT    0x0020  /* Robust locked but not consistent */
   43 
   44 /*
   45  * The umutex.m_lock values and bits.  The m_owner is the word which
   46  * serves as the lock.  Its high bit is the contention indicator and
   47  * rest of bits records the owner TID.  TIDs values start with PID_MAX
   48  * + 2 and end by INT32_MAX.  The low range [1..PID_MAX] is guaranteed
   49  * to be useable as the special markers.
   50  */
   51 #define UMUTEX_UNOWNED          0x0
   52 #define UMUTEX_CONTESTED        0x80000000U
   53 #define UMUTEX_RB_OWNERDEAD     (UMUTEX_CONTESTED | 0x10)
   54 #define UMUTEX_RB_NOTRECOV      (UMUTEX_CONTESTED | 0x11)
   55 
   56 /* urwlock flags */
   57 #define URWLOCK_PREFER_READER   0x0002
   58 
   59 #define URWLOCK_WRITE_OWNER     0x80000000U
   60 #define URWLOCK_WRITE_WAITERS   0x40000000U
   61 #define URWLOCK_READ_WAITERS    0x20000000U
   62 #define URWLOCK_MAX_READERS     0x1fffffffU
   63 #define URWLOCK_READER_COUNT(c) ((c) & URWLOCK_MAX_READERS)
   64 
   65 /* _usem flags */
   66 #define SEM_NAMED       0x0002
   67 
   68 /* _usem2 count field */
   69 #define USEM_HAS_WAITERS        0x80000000U
   70 #define USEM_MAX_COUNT          0x7fffffffU
   71 #define USEM_COUNT(c)           ((c) & USEM_MAX_COUNT)
   72 
   73 /* op code for _umtx_op */
   74 #define UMTX_OP_RESERVED0       0
   75 #define UMTX_OP_RESERVED1       1
   76 #define UMTX_OP_WAIT            2
   77 #define UMTX_OP_WAKE            3
   78 #define UMTX_OP_MUTEX_TRYLOCK   4
   79 #define UMTX_OP_MUTEX_LOCK      5
   80 #define UMTX_OP_MUTEX_UNLOCK    6
   81 #define UMTX_OP_SET_CEILING     7
   82 #define UMTX_OP_CV_WAIT         8
   83 #define UMTX_OP_CV_SIGNAL       9
   84 #define UMTX_OP_CV_BROADCAST    10
   85 #define UMTX_OP_WAIT_UINT       11
   86 #define UMTX_OP_RW_RDLOCK       12
   87 #define UMTX_OP_RW_WRLOCK       13
   88 #define UMTX_OP_RW_UNLOCK       14
   89 #define UMTX_OP_WAIT_UINT_PRIVATE       15
   90 #define UMTX_OP_WAKE_PRIVATE    16
   91 #define UMTX_OP_MUTEX_WAIT      17
   92 #define UMTX_OP_MUTEX_WAKE      18      /* deprecated */
   93 #define UMTX_OP_SEM_WAIT        19      /* deprecated */
   94 #define UMTX_OP_SEM_WAKE        20      /* deprecated */
   95 #define UMTX_OP_NWAKE_PRIVATE   21
   96 #define UMTX_OP_MUTEX_WAKE2     22
   97 #define UMTX_OP_SEM2_WAIT       23
   98 #define UMTX_OP_SEM2_WAKE       24
   99 #define UMTX_OP_SHM             25
  100 #define UMTX_OP_ROBUST_LISTS    26
  101 
  102 /* Flags for UMTX_OP_CV_WAIT */
  103 #define CVWAIT_CHECK_UNPARKING  0x01
  104 #define CVWAIT_ABSTIME          0x02
  105 #define CVWAIT_CLOCKID          0x04
  106 
  107 #define UMTX_ABSTIME            0x01
  108 
  109 #define UMTX_CHECK_UNPARKING    CVWAIT_CHECK_UNPARKING
  110 
  111 /* Flags for UMTX_OP_SHM */
  112 #define UMTX_SHM_CREAT          0x0001
  113 #define UMTX_SHM_LOOKUP         0x0002
  114 #define UMTX_SHM_DESTROY        0x0004
  115 #define UMTX_SHM_ALIVE          0x0008
  116 
  117 struct umtx_robust_lists_params {
  118         uintptr_t       robust_list_offset;
  119         uintptr_t       robust_priv_list_offset;
  120         uintptr_t       robust_inact_offset;
  121 };
  122 
  123 #ifndef _KERNEL
  124 
  125 int _umtx_op(void *obj, int op, u_long val, void *uaddr, void *uaddr2);
  126 
  127 #else
  128 
  129 /*
  130  * The umtx_key structure is used by both the Linux futex code and the
  131  * umtx implementation to map userland addresses to unique keys.
  132  */
  133 
  134 enum {
  135         TYPE_SIMPLE_WAIT,
  136         TYPE_CV,
  137         TYPE_SEM,
  138         TYPE_SIMPLE_LOCK,
  139         TYPE_NORMAL_UMUTEX,
  140         TYPE_PI_UMUTEX,
  141         TYPE_PP_UMUTEX,
  142         TYPE_RWLOCK,
  143         TYPE_FUTEX,
  144         TYPE_SHM,
  145         TYPE_PI_ROBUST_UMUTEX,
  146         TYPE_PP_ROBUST_UMUTEX,
  147 };
  148 
  149 /* Key to represent a unique userland synchronous object */
  150 struct umtx_key {
  151         int     hash;
  152         int     type;
  153         int     shared;
  154         union {
  155                 struct {
  156                         struct vm_object *object;
  157                         uintptr_t       offset;
  158                 } shared;
  159                 struct {
  160                         struct vmspace  *vs;
  161                         uintptr_t       addr;
  162                 } private;
  163                 struct {
  164                         void            *a;
  165                         uintptr_t       b;
  166                 } both;
  167         } info;
  168 };
  169 
  170 #define THREAD_SHARE            0
  171 #define PROCESS_SHARE           1
  172 #define AUTO_SHARE              2
  173 
  174 struct thread;
  175 
  176 static inline int
  177 umtx_key_match(const struct umtx_key *k1, const struct umtx_key *k2)
  178 {
  179         return (k1->type == k2->type &&
  180                 k1->info.both.a == k2->info.both.a &&
  181                 k1->info.both.b == k2->info.both.b);
  182 }
  183 
  184 int umtx_copyin_timeout(const void *, struct timespec *);
  185 int umtx_key_get(const void *, int, int, struct umtx_key *);
  186 void umtx_key_release(struct umtx_key *);
  187 struct umtx_q *umtxq_alloc(void);
  188 void umtxq_free(struct umtx_q *);
  189 int kern_umtx_wake(struct thread *, void *, int, int);
  190 void umtx_pi_adjust(struct thread *, u_char);
  191 void umtx_thread_init(struct thread *);
  192 void umtx_thread_fini(struct thread *);
  193 void umtx_thread_alloc(struct thread *);
  194 void umtx_thread_exit(struct thread *);
  195 #endif /* !_KERNEL */
  196 #endif /* !_SYS_UMTX_H_ */

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