FreeBSD/Linux Kernel Cross Reference
sys/common/sys/thread.h

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or http://www.opensolaris.org/os/licensing.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    
    /*
     * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
     * Use is subject to license terms.
     */
    
    #ifndef _SYS_THREAD_H
    #define _SYS_THREAD_H
    
    
    #include <sys/types.h>
    #include <sys/t_lock.h>
    #include <sys/klwp.h>
    #include <sys/time.h>
    #include <sys/signal.h>
    #include <sys/kcpc.h>
    #if defined(__GNUC__) && defined(_ASM_INLINES) && defined(_KERNEL)
    #include <asm/thread.h>
    #endif
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    /*
     * The thread object, its states, and the methods by which it
     * is accessed.
     */
    
    /*
     * Values that t_state may assume. Note that t_state cannot have more
     * than one of these flags set at a time.
     */
    #define TS_FREE         0x00    /* Thread at loose ends */
    #define TS_SLEEP        0x01    /* Awaiting an event */
    #define TS_RUN          0x02    /* Runnable, but not yet on a processor */
    #define TS_ONPROC       0x04    /* Thread is being run on a processor */
    #define TS_ZOMB         0x08    /* Thread has died but hasn't been reaped */
    #define TS_STOPPED      0x10    /* Stopped, initial state */
    #define TS_WAIT         0x20    /* Waiting to become runnable */
    
    typedef struct ctxop {
            void    (*save_op)(void *);     /* function to invoke to save context */
            void    (*restore_op)(void *);  /* function to invoke to restore ctx */
            void    (*fork_op)(void *, void *);     /* invoke to fork context */
            void    (*lwp_create_op)(void *, void *);       /* lwp_create context */
            void    (*exit_op)(void *);     /* invoked during {thread,lwp}_exit() */
            void    (*free_op)(void *, int); /* function which frees the context */
            void    *arg;           /* argument to above functions, ctx pointer */
            struct ctxop *next;     /* next context ops */
    } ctxop_t;
    
    /*
     * The active file descriptor table.
     * Each member of a_fd[] not equalling -1 represents an active fd.
     * The structure is initialized on first use; all zeros means uninitialized.
     */
    typedef struct {
            kmutex_t a_fdlock;      /* protects a_fd and a_nfd */
            int     *a_fd;          /* pointer to list of fds */
            int     a_nfd;          /* number of entries in *a_fd */
            int     a_stale;        /* one of the active fds is being closed */
            int     a_buf[2];       /* buffer to which a_fd initially refers */
    } afd_t;
    
    /*
     * An lwpchan provides uniqueness when sleeping on user-level
     * synchronization primitives.  The lc_wchan member is used
     * for sleeping on kernel synchronization primitives.
     */
    typedef struct {
            caddr_t lc_wchan0;
            caddr_t lc_wchan;
    } lwpchan_t;
    
    typedef struct _kthread *kthread_id_t;
    
    struct turnstile;
    struct panic_trap_info;
   struct upimutex;
   struct kproject;
   struct on_trap_data;
   struct waitq;
   struct _kcpc_ctx;
   struct _kcpc_set;
   
   /* Definition for kernel thread identifier type */
   typedef uint64_t kt_did_t;
   
   typedef struct _kthread {
           struct _kthread *t_link; /* dispq, sleepq, and free queue link */
   
           caddr_t t_stk;          /* base of stack (kernel sp value to use) */
           void    (*t_startpc)(void);     /* PC where thread started */
           struct cpu *t_bound_cpu; /* cpu bound to, or NULL if not bound */
           short   t_affinitycnt;  /* nesting level of kernel affinity-setting */
           short   t_bind_cpu;     /* user-specified CPU binding (-1 if none) */
           ushort_t t_flag;                /* modified only by current thread */
           ushort_t t_proc_flag;   /* modified holding ttproc(t)->p_lock */
           ushort_t t_schedflag;   /* modified holding thread_lock(t) */
           volatile char t_preempt;        /* don't preempt thread if set */
           volatile char t_preempt_lk;
           uint_t  t_state;        /* thread state (protected by thread_lock) */
           pri_t   t_pri;          /* assigned thread priority */
           pri_t   t_epri;         /* inherited thread priority */
           pri_t   t_cpri;         /* thread scheduling class priority */
           char    t_writer;       /* sleeping in lwp_rwlock_lock(RW_WRITE_LOCK) */
           uchar_t t_bindflag;     /* CPU and pset binding type */
           label_t t_pcb;          /* pcb, save area when switching */
           lwpchan_t t_lwpchan;    /* reason for blocking */
   #define t_wchan0        t_lwpchan.lc_wchan0
   #define t_wchan         t_lwpchan.lc_wchan
           struct _sobj_ops *t_sobj_ops;
           id_t    t_cid;          /* scheduling class id */
           struct thread_ops *t_clfuncs;   /* scheduling class ops vector */
           void    *t_cldata;      /* per scheduling class specific data */
           ctxop_t *t_ctx;         /* thread context */
           uintptr_t t_lofault;    /* ret pc for failed page faults */
           label_t *t_onfault;     /* on_fault() setjmp buf */
           struct on_trap_data *t_ontrap;  /* on_trap() protection data */
           caddr_t t_swap;         /* the bottom of the stack, if from segkp */
           lock_t  t_lock;         /* used to resume() a thread */
           uint8_t t_lockstat;     /* set while thread is in lockstat code */
           uint8_t t_pil;          /* interrupt thread PIL */
           disp_lock_t     t_pi_lock;      /* lock protecting t_prioinv list */
           char    t_nomigrate;    /* do not migrate if set */
           struct cpu      *t_cpu; /* CPU that thread last ran on */
           struct cpu      *t_weakbound_cpu;       /* cpu weakly bound to */
           struct lgrp_ld  *t_lpl; /* load average for home lgroup */
           void            *t_lgrp_reserv[2];      /* reserved for future */
           struct _kthread *t_intr; /* interrupted (pinned) thread */
           uint64_t        t_intr_start;   /* timestamp when time slice began */
           kt_did_t        t_did;  /* thread id for kernel debuggers */
           caddr_t t_tnf_tpdp;     /* Trace facility data pointer */
           struct _kcpc_ctx *t_cpc_ctx;    /* performance counter context */
           struct _kcpc_set *t_cpc_set;    /* set this thread has bound */
   
           /*
            * non swappable part of the lwp state.
            */
           id_t            t_tid;          /* lwp's id */
           id_t            t_waitfor;      /* target lwp id in lwp_wait() */
           struct sigqueue *t_sigqueue;    /* queue of siginfo structs */
           k_sigset_t      t_sig;          /* signals pending to this process */
           k_sigset_t      t_extsig;       /* signals sent from another contract */
           k_sigset_t      t_hold;         /* hold signal bit mask */
           k_sigset_t      t_sigwait;      /* sigtimedwait() is accepting these */
           struct  _kthread *t_forw;       /* process's forward thread link */
           struct  _kthread *t_back;       /* process's backward thread link */
           struct  _kthread *t_thlink;     /* tid (lwpid) lookup hash link */
           klwp_t  *t_lwp;                 /* thread's lwp pointer */
           struct  proc    *t_procp;       /* proc pointer */
           struct  t_audit_data *t_audit_data;     /* per thread audit data */
           struct  _kthread *t_next;       /* doubly linked list of all threads */
           struct  _kthread *t_prev;
           ushort_t t_whystop;             /* reason for stopping */
           ushort_t t_whatstop;            /* more detailed reason */
           int     t_dslot;                /* index in proc's thread directory */
           struct  pollstate *t_pollstate; /* state used during poll(2) */
           struct  pollcache *t_pollcache; /* to pass a pcache ptr by /dev/poll */
           struct  cred    *t_cred;        /* pointer to current cred */
           time_t  t_start;                /* start time, seconds since epoch */
           clock_t t_lbolt;                /* lbolt at last clock_tick() */
           hrtime_t t_stoptime;            /* timestamp at stop() */
           uint_t  t_pctcpu;               /* %cpu at last clock_tick(), binary */
                                           /* point at right of high-order bit */
           short   t_sysnum;               /* system call number */
           kcondvar_t      t_delay_cv;
           kmutex_t        t_delay_lock;
   
           /*
            * Pointer to the dispatcher lock protecting t_state and state-related
            * flags.  This pointer can change during waits on the lock, so
            * it should be grabbed only by thread_lock().
            */
           disp_lock_t     *t_lockp;       /* pointer to the dispatcher lock */
           ushort_t        t_oldspl;       /* spl level before dispatcher locked */
           volatile char   t_pre_sys;      /* pre-syscall work needed */
           lock_t          t_lock_flush;   /* for lock_mutex_flush() impl */
           struct _disp    *t_disp_queue;  /* run queue for chosen CPU */
           clock_t         t_disp_time;    /* last time this thread was running */
           uint_t          t_kpri_req;     /* kernel priority required */
   
           /*
            * Post-syscall / post-trap flags.
            *      No lock is required to set these.
            *      These must be cleared only by the thread itself.
            *
            *      t_astflag indicates that some post-trap processing is required,
            *              possibly a signal or a preemption.  The thread will not
            *              return to user with this set.
            *      t_post_sys indicates that some unusualy post-system call
            *              handling is required, such as an error or tracing.
            *      t_sig_check indicates that some condition in ISSIG() must be
            *              checked, but doesn't prevent returning to user.
            *      t_post_sys_ast is a way of checking whether any of these three
            *              flags are set.
            */
           union __tu {
                   struct __ts {
                           volatile char   _t_astflag;     /* AST requested */
                           volatile char   _t_sig_check;   /* ISSIG required */
                           volatile char   _t_post_sys;    /* post_syscall req */
                           volatile char   _t_trapret;     /* call CL_TRAPRET */
                   } _ts;
                   volatile int    _t_post_sys_ast;        /* OR of these flags */
           } _tu;
   #define t_astflag       _tu._ts._t_astflag
   #define t_sig_check     _tu._ts._t_sig_check
   #define t_post_sys      _tu._ts._t_post_sys
   #define t_trapret       _tu._ts._t_trapret
   #define t_post_sys_ast  _tu._t_post_sys_ast
   
           /*
            * Real time microstate profiling.
            */
                                           /* possible 4-byte filler */
           hrtime_t t_waitrq;              /* timestamp for run queue wait time */
           int     t_mstate;               /* current microstate */
           struct rprof {
                   int     rp_anystate;            /* set if any state non-zero */
                   uint_t  rp_state[NMSTATES];     /* mstate profiling counts */
           } *t_rprof;
   
           /*
            * There is a turnstile inserted into the list below for
            * every priority inverted synchronization object that
            * this thread holds.
            */
   
           struct turnstile *t_prioinv;
   
           /*
            * Pointer to the turnstile attached to the synchronization
            * object where this thread is blocked.
            */
   
           struct turnstile *t_ts;
   
           /*
            * kernel thread specific data
            *      Borrowed from userland implementation of POSIX tsd
            */
           struct tsd_thread {
                   struct tsd_thread *ts_next;     /* threads with TSD */
                   struct tsd_thread *ts_prev;     /* threads with TSD */
                   uint_t            ts_nkeys;     /* entries in value array */
                   void              **ts_value;   /* array of value/key */
           } *t_tsd;
   
           clock_t         t_stime;        /* time stamp used by the swapper */
           struct door_data *t_door;       /* door invocation data */
           kmutex_t        *t_plockp;      /* pointer to process's p_lock */
   
           struct sc_shared *t_schedctl;   /* scheduler activations shared data */
           uintptr_t       t_sc_uaddr;     /* user-level address of shared data */
   
           struct cpupart  *t_cpupart;     /* partition containing thread */
           int             t_bind_pset;    /* processor set binding */
   
           struct copyops  *t_copyops;     /* copy in/out ops vector */
   
           caddr_t         t_stkbase;      /* base of the the stack */
           struct page     *t_red_pp;      /* if non-NULL, redzone is mapped */
   
           afd_t           t_activefd;     /* active file descriptor table */
   
           struct _kthread *t_priforw;     /* sleepq per-priority sublist */
           struct _kthread *t_priback;
   
           struct sleepq   *t_sleepq;      /* sleep queue thread is waiting on */
           struct panic_trap_info *t_panic_trap;   /* saved data from fatal trap */
           int             *t_lgrp_affinity;       /* lgroup affinity */
           struct upimutex *t_upimutex;    /* list of upimutexes owned by thread */
           uint32_t        t_nupinest;     /* number of nested held upi mutexes */
           struct kproject *t_proj;        /* project containing this thread */
           uint8_t         t_unpark;       /* modified holding t_delay_lock */
           uint8_t         t_release;      /* lwp_release() waked up the thread */
           uint8_t         t_hatdepth;     /* depth of recursive hat_memloads */
           uint8_t         t_xpvcntr;      /* see xen_block_migrate() */
           kcondvar_t      t_joincv;       /* cv used to wait for thread exit */
           void            *t_taskq;       /* for threads belonging to taskq */
           hrtime_t        t_anttime;      /* most recent time anticipatory load */
                                           /*      was added to an lgroup's load */
                                           /*      on this thread's behalf */
           char            *t_pdmsg;       /* privilege debugging message */
   
           uint_t          t_predcache;    /* DTrace predicate cache */
           hrtime_t        t_dtrace_vtime; /* DTrace virtual time */
           hrtime_t        t_dtrace_start; /* DTrace slice start time */
   
           uint8_t         t_dtrace_stop;  /* indicates a DTrace-desired stop */
           uint8_t         t_dtrace_sig;   /* signal sent via DTrace's raise() */
   
           union __tdu {
                   struct __tds {
                           uint8_t _t_dtrace_on;   /* hit a fasttrap tracepoint */
                           uint8_t _t_dtrace_step; /* about to return to kernel */
                           uint8_t _t_dtrace_ret;  /* handling a return probe */
                           uint8_t _t_dtrace_ast;  /* saved ast flag */
   #ifdef __amd64
                           uint8_t _t_dtrace_reg;  /* modified register */
   #endif
                   } _tds;
                   ulong_t _t_dtrace_ft;           /* bitwise or of these flags */
           } _tdu;
   #define t_dtrace_ft     _tdu._t_dtrace_ft
   #define t_dtrace_on     _tdu._tds._t_dtrace_on
   #define t_dtrace_step   _tdu._tds._t_dtrace_step
   #define t_dtrace_ret    _tdu._tds._t_dtrace_ret
   #define t_dtrace_ast    _tdu._tds._t_dtrace_ast
   #ifdef __amd64
   #define t_dtrace_reg    _tdu._tds._t_dtrace_reg
   #endif
   
           uintptr_t       t_dtrace_pc;    /* DTrace saved pc from fasttrap */
           uintptr_t       t_dtrace_npc;   /* DTrace next pc from fasttrap */
           uintptr_t       t_dtrace_scrpc; /* DTrace per-thread scratch location */
           uintptr_t       t_dtrace_astpc; /* DTrace return sequence location */
   #ifdef __amd64
           uint64_t        t_dtrace_regv;  /* DTrace saved reg from fasttrap */
   #endif
           hrtime_t        t_hrtime;       /* high-res last time on cpu */
           kmutex_t        t_ctx_lock;     /* protects t_ctx in removectx() */
           struct waitq    *t_waitq;       /* wait queue */
           kmutex_t        t_wait_mutex;   /* used in CV wait functions */
   } kthread_t;
   
   /*
    * Thread flag (t_flag) definitions.
    *      These flags must be changed only for the current thread,
    *      and not during preemption code, since the code being
    *      preempted could be modifying the flags.
    *
    *      For the most part these flags do not need locking.
    *      The following flags will only be changed while the thread_lock is held,
    *      to give assurrance that they are consistent with t_state:
    *              T_WAKEABLE
    */
   #define T_INTR_THREAD   0x0001  /* thread is an interrupt thread */
   #define T_WAKEABLE      0x0002  /* thread is blocked, signals enabled */
   #define T_TOMASK        0x0004  /* use lwp_sigoldmask on return from signal */
   #define T_TALLOCSTK     0x0008  /* thread structure allocated from stk */
   #define T_FORKALL       0x0010  /* thread was cloned by forkall() */
   #define T_WOULDBLOCK    0x0020  /* for lockfs */
   #define T_DONTBLOCK     0x0040  /* for lockfs */
   #define T_DONTPEND      0x0080  /* for lockfs */
   #define T_SYS_PROF      0x0100  /* profiling on for duration of system call */
   #define T_WAITCVSEM     0x0200  /* waiting for a lwp_cv or lwp_sema on sleepq */
   #define T_WATCHPT       0x0400  /* thread undergoing a watchpoint emulation */
   #define T_PANIC         0x0800  /* thread initiated a system panic */
   #define T_LWPREUSE      0x1000  /* stack and LWP can be reused */
   #define T_CAPTURING     0x2000  /* thread is in page capture logic */
   #define T_VFPARENT      0x4000  /* thread is vfork parent, must call vfwait */
   #define T_DONTDTRACE    0x8000  /* disable DTrace probes */
   
   /*
    * Flags in t_proc_flag.
    *      These flags must be modified only when holding the p_lock
    *      for the associated process.
    */
   #define TP_DAEMON       0x0001  /* this is an LWP_DAEMON lwp */
   #define TP_HOLDLWP      0x0002  /* hold thread's lwp */
   #define TP_TWAIT        0x0004  /* wait to be freed by lwp_wait() */
   #define TP_LWPEXIT      0x0008  /* lwp has exited */
   #define TP_PRSTOP       0x0010  /* thread is being stopped via /proc */
   #define TP_CHKPT        0x0020  /* thread is being stopped via CPR checkpoint */
   #define TP_EXITLWP      0x0040  /* terminate this lwp */
   #define TP_PRVSTOP      0x0080  /* thread is virtually stopped via /proc */
   #define TP_MSACCT       0x0100  /* collect micro-state accounting information */
   #define TP_STOPPING     0x0200  /* thread is executing stop() */
   #define TP_WATCHPT      0x0400  /* process has watchpoints in effect */
   #define TP_PAUSE        0x0800  /* process is being stopped via pauselwps() */
   #define TP_CHANGEBIND   0x1000  /* thread has a new cpu/cpupart binding */
   #define TP_ZTHREAD      0x2000  /* this is a kernel thread for a zone */
   #define TP_WATCHSTOP    0x4000  /* thread is stopping via holdwatch() */
   
   /*
    * Thread scheduler flag (t_schedflag) definitions.
    *      The thread must be locked via thread_lock() or equiv. to change these.
    */
   #define TS_LOAD         0x0001  /* thread is in memory */
   #define TS_DONT_SWAP    0x0002  /* thread/lwp should not be swapped */
   #define TS_SWAPENQ      0x0004  /* swap thread when it reaches a safe point */
   #define TS_ON_SWAPQ     0x0008  /* thread is on the swap queue */
   #define TS_SIGNALLED    0x0010  /* thread was awakened by cv_signal() */
   #define TS_PROJWAITQ    0x0020  /* thread is on its project's waitq */
   #define TS_ZONEWAITQ    0x0040  /* thread is on its zone's waitq */
   #define TS_CSTART       0x0100  /* setrun() by continuelwps() */
   #define TS_UNPAUSE      0x0200  /* setrun() by unpauselwps() */
   #define TS_XSTART       0x0400  /* setrun() by SIGCONT */
   #define TS_PSTART       0x0800  /* setrun() by /proc */
   #define TS_RESUME       0x1000  /* setrun() by CPR resume process */
   #define TS_CREATE       0x2000  /* setrun() by syslwp_create() */
   #define TS_RUNQMATCH    0x4000  /* exact run queue balancing by setbackdq() */
   #define TS_ALLSTART     \
           (TS_CSTART|TS_UNPAUSE|TS_XSTART|TS_PSTART|TS_RESUME|TS_CREATE)
   #define TS_ANYWAITQ     (TS_PROJWAITQ|TS_ZONEWAITQ)
   
   /*
    * Thread binding types
    */
   #define TB_ALLHARD      0
   #define TB_CPU_SOFT     0x01            /* soft binding to CPU */
   #define TB_PSET_SOFT    0x02            /* soft binding to pset */
   
   #define TB_CPU_SOFT_SET(t)              ((t)->t_bindflag |= TB_CPU_SOFT)
   #define TB_CPU_HARD_SET(t)              ((t)->t_bindflag &= ~TB_CPU_SOFT)
   #define TB_PSET_SOFT_SET(t)             ((t)->t_bindflag |= TB_PSET_SOFT)
   #define TB_PSET_HARD_SET(t)             ((t)->t_bindflag &= ~TB_PSET_SOFT)
   #define TB_CPU_IS_SOFT(t)               ((t)->t_bindflag & TB_CPU_SOFT)
   #define TB_CPU_IS_HARD(t)               (!TB_CPU_IS_SOFT(t))
   #define TB_PSET_IS_SOFT(t)              ((t)->t_bindflag & TB_PSET_SOFT)
   
   /*
    * No locking needed for AST field.
    */
   #define aston(t)                ((t)->t_astflag = 1)
   #define astoff(t)               ((t)->t_astflag = 0)
   
   /* True if thread is stopped on an event of interest */
   #define ISTOPPED(t) ((t)->t_state == TS_STOPPED && \
                           !((t)->t_schedflag & TS_PSTART))
   
   /* True if thread is asleep and wakeable */
   #define ISWAKEABLE(t) (((t)->t_state == TS_SLEEP && \
                           ((t)->t_flag & T_WAKEABLE)))
   
   /* True if thread is on the wait queue */
   #define ISWAITING(t) ((t)->t_state == TS_WAIT)
   
   /* similar to ISTOPPED except the event of interest is CPR */
   #define CPR_ISTOPPED(t) ((t)->t_state == TS_STOPPED && \
                           !((t)->t_schedflag & TS_RESUME))
   
   /*
    * True if thread is virtually stopped (is or was asleep in
    * one of the lwp_*() system calls and marked to stop by /proc.)
    */
   #define VSTOPPED(t)     ((t)->t_proc_flag & TP_PRVSTOP)
   
   /* similar to VSTOPPED except the point of interest is CPR */
   #define CPR_VSTOPPED(t)                         \
           ((t)->t_state == TS_SLEEP &&            \
           (t)->t_wchan0 != NULL &&                \
           ((t)->t_flag & T_WAKEABLE) &&           \
           ((t)->t_proc_flag & TP_CHKPT))
   
   /* True if thread has been stopped by hold*() or was created stopped */
   #define SUSPENDED(t) ((t)->t_state == TS_STOPPED && \
           ((t)->t_schedflag & (TS_CSTART|TS_UNPAUSE)) != (TS_CSTART|TS_UNPAUSE))
   
   /* True if thread possesses an inherited priority */
   #define INHERITED(t)    ((t)->t_epri != 0)
   
   /* The dispatch priority of a thread */
   #define DISP_PRIO(t) ((t)->t_epri > (t)->t_pri ? (t)->t_epri : (t)->t_pri)
   
   /* The assigned priority of a thread */
   #define ASSIGNED_PRIO(t)        ((t)->t_pri)
   
   /*
    * Macros to determine whether a thread can be swapped.
    * If t_lock is held, the thread is either on a processor or being swapped.
    */
   #define SWAP_OK(t)      (!LOCK_HELD(&(t)->t_lock))
   
   /*
    * proctot(x)
    *      convert a proc pointer to a thread pointer. this only works with
    *      procs that have only one lwp.
    *
    * proctolwp(x)
    *      convert a proc pointer to a lwp pointer. this only works with
    *      procs that have only one lwp.
    *
    * ttolwp(x)
    *      convert a thread pointer to its lwp pointer.
    *
    * ttoproc(x)
    *      convert a thread pointer to its proc pointer.
    *
    * ttoproj(x)
    *      convert a thread pointer to its project pointer.
    *
    * ttozone(x)
    *      convert a thread pointer to its zone pointer.
    *
    * lwptot(x)
    *      convert a lwp pointer to its thread pointer.
    *
    * lwptoproc(x)
    *      convert a lwp to its proc pointer.
    */
   #define proctot(x)      ((x)->p_tlist)
   #define proctolwp(x)    ((x)->p_tlist->t_lwp)
   #define ttolwp(x)       ((x)->t_lwp)
   #define ttoproc(x)      ((x)->t_procp)
   #define ttoproj(x)      ((x)->t_proj)
   #define ttozone(x)      ((x)->t_procp->p_zone)
   #define lwptot(x)       ((x)->lwp_thread)
   #define lwptoproc(x)    ((x)->lwp_procp)
   
   #define t_pc            t_pcb.val[0]
   #define t_sp            t_pcb.val[1]
   
   #ifdef  _KERNEL
   
   extern  kthread_t       *threadp(void); /* inline, returns thread pointer */
   #define curthread       (threadp())             /* current thread pointer */
   #define curproc         (ttoproc(curthread))    /* current process pointer */
   #define curproj         (ttoproj(curthread))    /* current project pointer */
   #define curzone         (curproc->p_zone)       /* current zone pointer */
   
   extern  struct _kthread t0;             /* the scheduler thread */
   extern  kmutex_t        pidlock;        /* global process lock */
   
   /*
    * thread_free_lock is used by the tick accounting thread to keep a thread
    * from being freed while it is being examined.
    *
    * Thread structures are 32-byte aligned structures. That is why we use the
    * following formula.
    */
   #define THREAD_FREE_BITS        10
   #define THREAD_FREE_NUM         (1 << THREAD_FREE_BITS)
   #define THREAD_FREE_MASK        (THREAD_FREE_NUM - 1)
   #define THREAD_FREE_1           PTR24_LSB
   #define THREAD_FREE_2           (PTR24_LSB + THREAD_FREE_BITS)
   #define THREAD_FREE_SHIFT(t)    \
           (((ulong_t)(t) >> THREAD_FREE_1) ^ ((ulong_t)(t) >> THREAD_FREE_2))
   #define THREAD_FREE_HASH(t)     (THREAD_FREE_SHIFT(t) & THREAD_FREE_MASK)
   
   typedef struct thread_free_lock {
           kmutex_t        tf_lock;
           uchar_t         tf_pad[64 - sizeof (kmutex_t)];
   } thread_free_lock_t;
   
   extern void     thread_free_prevent(kthread_t *);
   extern void     thread_free_allow(kthread_t *);
   
   /*
    * Routines to change the priority and effective priority
    * of a thread-locked thread, whatever its state.
    */
   extern int      thread_change_pri(kthread_t *t, pri_t disp_pri, int front);
   extern void     thread_change_epri(kthread_t *t, pri_t disp_pri);
   
   /*
    * Routines that manipulate the dispatcher lock for the thread.
    * The locking heirarchy is as follows:
    *      cpu_lock > sleepq locks > run queue locks
    */
   void    thread_transition(kthread_t *); /* move to transition lock */
   void    thread_stop(kthread_t *);       /* move to stop lock */
   void    thread_lock(kthread_t *);       /* lock thread and its queue */
   void    thread_lock_high(kthread_t *);  /* lock thread and its queue */
   void    thread_onproc(kthread_t *, struct cpu *); /* set onproc state lock */
   
   #define thread_unlock(t)                disp_lock_exit((t)->t_lockp)
   #define thread_unlock_high(t)           disp_lock_exit_high((t)->t_lockp)
   #define thread_unlock_nopreempt(t)      disp_lock_exit_nopreempt((t)->t_lockp)
   
   #define THREAD_LOCK_HELD(t)     (DISP_LOCK_HELD((t)->t_lockp))
   
   extern disp_lock_t transition_lock;     /* lock protecting transiting threads */
   extern disp_lock_t stop_lock;           /* lock protecting stopped threads */
   
   caddr_t thread_stk_init(caddr_t);       /* init thread stack */
   
   extern int default_binding_mode;
   
   #endif  /* _KERNEL */
   
   /*
    * Macros to indicate that the thread holds resources that could be critical
    * to other kernel threads, so this thread needs to have kernel priority
    * if it blocks or is preempted.  Note that this is not necessary if the
    * resource is a mutex or a writer lock because of priority inheritance.
    *
    * The only way one thread may legally manipulate another thread's t_kpri_req
    * is to hold the target thread's thread lock while that thread is asleep.
    * (The rwlock code does this to implement direct handoff to waiting readers.)
    */
   #define THREAD_KPRI_REQUEST()   (curthread->t_kpri_req++)
   #define THREAD_KPRI_RELEASE()   (curthread->t_kpri_req--)
   #define THREAD_KPRI_RELEASE_N(n) (curthread->t_kpri_req -= (n))
   
   /*
    * Macro to change a thread's priority.
    */
   #define THREAD_CHANGE_PRI(t, pri) {                                     \
           pri_t __new_pri = (pri);                                        \
           DTRACE_SCHED2(change__pri, kthread_t *, (t), pri_t, __new_pri); \
           (t)->t_pri = __new_pri;                                         \
           schedctl_set_cidpri(t);                                         \
   }
   
   /*
    * Macro to indicate that a thread's priority is about to be changed.
    */
   #define THREAD_WILLCHANGE_PRI(t, pri) {                                 \
           DTRACE_SCHED2(change__pri, kthread_t *, (t), pri_t, (pri));     \
   }
   
   /*
    * Macros to change thread state and the associated lock.
    */
   #define THREAD_SET_STATE(tp, state, lp) \
                   ((tp)->t_state = state, (tp)->t_lockp = lp)
   
   /*
    * Point it at the transition lock, which is always held.
    * The previosly held lock is dropped.
    */
   #define THREAD_TRANSITION(tp)   thread_transition(tp);
   /*
    * Set the thread's lock to be the transition lock, without dropping
    * previosly held lock.
    */
   #define THREAD_TRANSITION_NOLOCK(tp)    ((tp)->t_lockp = &transition_lock)
   
   /*
    * Put thread in run state, and set the lock pointer to the dispatcher queue
    * lock pointer provided.  This lock should be held.
    */
   #define THREAD_RUN(tp, lp)      THREAD_SET_STATE(tp, TS_RUN, lp)
   
   /*
    * Put thread in wait state, and set the lock pointer to the wait queue
    * lock pointer provided.  This lock should be held.
    */
   #define THREAD_WAIT(tp, lp)     THREAD_SET_STATE(tp, TS_WAIT, lp)
   
   /*
    * Put thread in run state, and set the lock pointer to the dispatcher queue
    * lock pointer provided (i.e., the "swapped_lock").  This lock should be held.
    */
   #define THREAD_SWAP(tp, lp)     THREAD_SET_STATE(tp, TS_RUN, lp)
   
   /*
    * Put the thread in zombie state and set the lock pointer to NULL.
    * The NULL will catch anything that tries to lock a zombie.
    */
   #define THREAD_ZOMB(tp)         THREAD_SET_STATE(tp, TS_ZOMB, NULL)
   
   /*
    * Set the thread into ONPROC state, and point the lock at the CPUs
    * lock for the onproc thread(s).  This lock should be held, so the
    * thread deoes not become unlocked, since these stores can be reordered.
    */
   #define THREAD_ONPROC(tp, cpu)  \
                   THREAD_SET_STATE(tp, TS_ONPROC, &(cpu)->cpu_thread_lock)
   
   /*
    * Set the thread into the TS_SLEEP state, and set the lock pointer to
    * to some sleep queue's lock.  The new lock should already be held.
    */
   #define THREAD_SLEEP(tp, lp)    {                               \
                           disp_lock_t     *tlp;                   \
                           tlp = (tp)->t_lockp;                    \
                           THREAD_SET_STATE(tp, TS_SLEEP, lp);     \
                           disp_lock_exit_high(tlp);               \
                           }
   
   /*
    * Interrupt threads are created in TS_FREE state, and their lock
    * points at the associated CPU's lock.
    */
   #define THREAD_FREEINTR(tp, cpu)        \
                   THREAD_SET_STATE(tp, TS_FREE, &(cpu)->cpu_thread_lock)
   
   /* if tunable kmem_stackinfo is set, fill kthread stack with a pattern */
   #define KMEM_STKINFO_PATTERN    0xbadcbadcbadcbadcULL
   
   /*
    * If tunable kmem_stackinfo is set, log the latest KMEM_LOG_STK_USAGE_SIZE
    * dead kthreads that used their kernel stack the most.
    */
   #define KMEM_STKINFO_LOG_SIZE   16
   
   /* kthread name (cmd/lwpid) string size in the stackinfo log */
   #define KMEM_STKINFO_STR_SIZE   64
   
   /*
    * stackinfo logged data.
    */
   typedef struct kmem_stkinfo {
           caddr_t kthread;        /* kthread pointer */
           caddr_t t_startpc;      /* where kthread started */
           caddr_t start;          /* kthread stack start address */
           size_t  stksz;          /* kthread stack size */
           size_t  percent;        /* kthread stack high water mark */
           id_t    t_tid;          /* kthread id */
           char    cmd[KMEM_STKINFO_STR_SIZE];     /* kthread name (cmd/lwpid) */
   } kmem_stkinfo_t;
   
   #ifdef  __cplusplus
   }
   #endif
   
   #endif /* _SYS_THREAD_H */

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