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

     /*-
      * Copyright (c) 2002, Jeffrey Roberson <jeff@freebsd.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice unmodified, this list of conditions, and the following
     *    disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD: releng/11.1/sys/sys/umtx.h 300043 2016-05-17 09:56:22Z kib $
     *
     */
    
    #ifndef _SYS_UMTX_H_
    #define _SYS_UMTX_H_
    
    #include <sys/_umtx.h>
    
    /* Common lock flags */
    #define USYNC_PROCESS_SHARED    0x0001  /* Process shared sync objs */
    
    /* umutex flags */
    #define UMUTEX_PRIO_INHERIT     0x0004  /* Priority inherited mutex */
    #define UMUTEX_PRIO_PROTECT     0x0008  /* Priority protect mutex */
    #define UMUTEX_ROBUST           0x0010  /* Robust mutex */
    #define UMUTEX_NONCONSISTENT    0x0020  /* Robust locked but not consistent */
    
    /*
     * The umutex.m_lock values and bits.  The m_owner is the word which
     * serves as the lock.  Its high bit is the contention indicator and
     * rest of bits records the owner TID.  TIDs values start with PID_MAX
     * + 2 and end by INT32_MAX.  The low range [1..PID_MAX] is guaranteed
     * to be useable as the special markers.
     */
    #define UMUTEX_UNOWNED          0x0
    #define UMUTEX_CONTESTED        0x80000000U
    #define UMUTEX_RB_OWNERDEAD     (UMUTEX_CONTESTED | 0x10)
    #define UMUTEX_RB_NOTRECOV      (UMUTEX_CONTESTED | 0x11)
    
    /* urwlock flags */
    #define URWLOCK_PREFER_READER   0x0002
    
    #define URWLOCK_WRITE_OWNER     0x80000000U
    #define URWLOCK_WRITE_WAITERS   0x40000000U
    #define URWLOCK_READ_WAITERS    0x20000000U
    #define URWLOCK_MAX_READERS     0x1fffffffU
    #define URWLOCK_READER_COUNT(c) ((c) & URWLOCK_MAX_READERS)
    
    /* _usem flags */
    #define SEM_NAMED       0x0002
    
    /* _usem2 count field */
    #define USEM_HAS_WAITERS        0x80000000U
    #define USEM_MAX_COUNT          0x7fffffffU
    #define USEM_COUNT(c)           ((c) & USEM_MAX_COUNT)
    
    /* op code for _umtx_op */
    #define UMTX_OP_RESERVED0       0
    #define UMTX_OP_RESERVED1       1
    #define UMTX_OP_WAIT            2
    #define UMTX_OP_WAKE            3
    #define UMTX_OP_MUTEX_TRYLOCK   4
    #define UMTX_OP_MUTEX_LOCK      5
    #define UMTX_OP_MUTEX_UNLOCK    6
    #define UMTX_OP_SET_CEILING     7
    #define UMTX_OP_CV_WAIT         8
    #define UMTX_OP_CV_SIGNAL       9
    #define UMTX_OP_CV_BROADCAST    10
    #define UMTX_OP_WAIT_UINT       11
    #define UMTX_OP_RW_RDLOCK       12
    #define UMTX_OP_RW_WRLOCK       13
    #define UMTX_OP_RW_UNLOCK       14
    #define UMTX_OP_WAIT_UINT_PRIVATE       15
    #define UMTX_OP_WAKE_PRIVATE    16
    #define UMTX_OP_MUTEX_WAIT      17
    #define UMTX_OP_MUTEX_WAKE      18      /* deprecated */
    #define UMTX_OP_SEM_WAIT        19      /* deprecated */
    #define UMTX_OP_SEM_WAKE        20      /* deprecated */
    #define UMTX_OP_NWAKE_PRIVATE   21
    #define UMTX_OP_MUTEX_WAKE2     22
    #define UMTX_OP_SEM2_WAIT       23
    #define UMTX_OP_SEM2_WAKE       24
    #define UMTX_OP_SHM             25
   #define UMTX_OP_ROBUST_LISTS    26
   
   /* Flags for UMTX_OP_CV_WAIT */
   #define CVWAIT_CHECK_UNPARKING  0x01
   #define CVWAIT_ABSTIME          0x02
   #define CVWAIT_CLOCKID          0x04
   
   #define UMTX_ABSTIME            0x01
   
   #define UMTX_CHECK_UNPARKING    CVWAIT_CHECK_UNPARKING
   
   /* Flags for UMTX_OP_SHM */
   #define UMTX_SHM_CREAT          0x0001
   #define UMTX_SHM_LOOKUP         0x0002
   #define UMTX_SHM_DESTROY        0x0004
   #define UMTX_SHM_ALIVE          0x0008
   
   struct umtx_robust_lists_params {
           uintptr_t       robust_list_offset;
           uintptr_t       robust_priv_list_offset;
           uintptr_t       robust_inact_offset;
   };
   
   #ifndef _KERNEL
   
   int _umtx_op(void *obj, int op, u_long val, void *uaddr, void *uaddr2);
   
   #else
   
   /*
    * The umtx_key structure is used by both the Linux futex code and the
    * umtx implementation to map userland addresses to unique keys.
    */
   
   enum {
           TYPE_SIMPLE_WAIT,
           TYPE_CV,
           TYPE_SEM,
           TYPE_SIMPLE_LOCK,
           TYPE_NORMAL_UMUTEX,
           TYPE_PI_UMUTEX,
           TYPE_PP_UMUTEX,
           TYPE_RWLOCK,
           TYPE_FUTEX,
           TYPE_SHM,
           TYPE_PI_ROBUST_UMUTEX,
           TYPE_PP_ROBUST_UMUTEX,
   };
   
   /* Key to represent a unique userland synchronous object */
   struct umtx_key {
           int     hash;
           int     type;
           int     shared;
           union {
                   struct {
                           struct vm_object *object;
                           uintptr_t       offset;
                   } shared;
                   struct {
                           struct vmspace  *vs;
                           uintptr_t       addr;
                   } private;
                   struct {
                           void            *a;
                           uintptr_t       b;
                   } both;
           } info;
   };
   
   #define THREAD_SHARE            0
   #define PROCESS_SHARE           1
   #define AUTO_SHARE              2
   
   struct thread;
   
   static inline int
   umtx_key_match(const struct umtx_key *k1, const struct umtx_key *k2)
   {
           return (k1->type == k2->type &&
                   k1->info.both.a == k2->info.both.a &&
                   k1->info.both.b == k2->info.both.b);
   }
   
   int umtx_copyin_timeout(const void *, struct timespec *);
   int umtx_key_get(const void *, int, int, struct umtx_key *);
   void umtx_key_release(struct umtx_key *);
   struct umtx_q *umtxq_alloc(void);
   void umtxq_free(struct umtx_q *);
   int kern_umtx_wake(struct thread *, void *, int, int);
   void umtx_pi_adjust(struct thread *, u_char);
   void umtx_thread_init(struct thread *);
   void umtx_thread_fini(struct thread *);
   void umtx_thread_alloc(struct thread *);
   void umtx_thread_exit(struct thread *);
   #endif /* !_KERNEL */
   #endif /* !_SYS_UMTX_H_ */

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