1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26 
  27 #ifndef _SYS_THREAD_H
  28 #define _SYS_THREAD_H
  29 
  30 
  31 #include <sys/types.h>
  32 #include <sys/t_lock.h>
  33 #include <sys/klwp.h>
  34 #include <sys/time.h>
  35 #include <sys/signal.h>
  36 #include <sys/kcpc.h>
  37 #if defined(__GNUC__) && defined(_ASM_INLINES) && defined(_KERNEL)
  38 #include <asm/thread.h>
  39 #endif
  40 
  41 #ifdef  __cplusplus
  42 extern "C" {
  43 #endif
  44 
  45 /*
  46  * The thread object, its states, and the methods by which it
  47  * is accessed.
  48  */
  49 
  50 /*
  51  * Values that t_state may assume. Note that t_state cannot have more
  52  * than one of these flags set at a time.
  53  */
  54 #define TS_FREE         0x00    /* Thread at loose ends */
  55 #define TS_SLEEP        0x01    /* Awaiting an event */
  56 #define TS_RUN          0x02    /* Runnable, but not yet on a processor */
  57 #define TS_ONPROC       0x04    /* Thread is being run on a processor */
  58 #define TS_ZOMB         0x08    /* Thread has died but hasn't been reaped */
  59 #define TS_STOPPED      0x10    /* Stopped, initial state */
  60 #define TS_WAIT         0x20    /* Waiting to become runnable */
  61 
  62 typedef struct ctxop {
  63         void    (*save_op)(void *);     /* function to invoke to save context */
  64         void    (*restore_op)(void *);  /* function to invoke to restore ctx */
  65         void    (*fork_op)(void *, void *);     /* invoke to fork context */
  66         void    (*lwp_create_op)(void *, void *);       /* lwp_create context */
  67         void    (*exit_op)(void *);     /* invoked during {thread,lwp}_exit() */
  68         void    (*free_op)(void *, int); /* function which frees the context */
  69         void    *arg;           /* argument to above functions, ctx pointer */
  70         struct ctxop *next;     /* next context ops */
  71 } ctxop_t;
  72 
  73 /*
  74  * The active file descriptor table.
  75  * Each member of a_fd[] not equalling -1 represents an active fd.
  76  * The structure is initialized on first use; all zeros means uninitialized.
  77  */
  78 typedef struct {
  79         kmutex_t a_fdlock;      /* protects a_fd and a_nfd */
  80         int     *a_fd;          /* pointer to list of fds */
  81         int     a_nfd;          /* number of entries in *a_fd */
  82         int     a_stale;        /* one of the active fds is being closed */
  83         int     a_buf[2];       /* buffer to which a_fd initially refers */
  84 } afd_t;
  85 
  86 /*
  87  * An lwpchan provides uniqueness when sleeping on user-level
  88  * synchronization primitives.  The lc_wchan member is used
  89  * for sleeping on kernel synchronization primitives.
  90  */
  91 typedef struct {
  92         caddr_t lc_wchan0;
  93         caddr_t lc_wchan;
  94 } lwpchan_t;
  95 
  96 typedef struct _kthread *kthread_id_t;
  97 
  98 struct turnstile;
  99 struct panic_trap_info;
 100 struct upimutex;
 101 struct kproject;
 102 struct on_trap_data;
 103 struct waitq;
 104 struct _kcpc_ctx;
 105 struct _kcpc_set;
 106 
 107 /* Definition for kernel thread identifier type */
 108 typedef uint64_t kt_did_t;
 109 
 110 typedef struct _kthread {
 111         struct _kthread *t_link; /* dispq, sleepq, and free queue link */
 112 
 113         caddr_t t_stk;          /* base of stack (kernel sp value to use) */
 114         void    (*t_startpc)(void);     /* PC where thread started */
 115         struct cpu *t_bound_cpu; /* cpu bound to, or NULL if not bound */
 116         short   t_affinitycnt;  /* nesting level of kernel affinity-setting */
 117         short   t_bind_cpu;     /* user-specified CPU binding (-1 if none) */
 118         ushort_t t_flag;                /* modified only by current thread */
 119         ushort_t t_proc_flag;   /* modified holding ttproc(t)->p_lock */
 120         ushort_t t_schedflag;   /* modified holding thread_lock(t) */
 121         volatile char t_preempt;        /* don't preempt thread if set */
 122         volatile char t_preempt_lk;
 123         uint_t  t_state;        /* thread state (protected by thread_lock) */
 124         pri_t   t_pri;          /* assigned thread priority */
 125         pri_t   t_epri;         /* inherited thread priority */
 126         pri_t   t_cpri;         /* thread scheduling class priority */
 127         char    t_writer;       /* sleeping in lwp_rwlock_lock(RW_WRITE_LOCK) */
 128         uchar_t t_bindflag;     /* CPU and pset binding type */
 129         label_t t_pcb;          /* pcb, save area when switching */
 130         lwpchan_t t_lwpchan;    /* reason for blocking */
 131 #define t_wchan0        t_lwpchan.lc_wchan0
 132 #define t_wchan         t_lwpchan.lc_wchan
 133         struct _sobj_ops *t_sobj_ops;
 134         id_t    t_cid;          /* scheduling class id */
 135         struct thread_ops *t_clfuncs;   /* scheduling class ops vector */
 136         void    *t_cldata;      /* per scheduling class specific data */
 137         ctxop_t *t_ctx;         /* thread context */
 138         uintptr_t t_lofault;    /* ret pc for failed page faults */
 139         label_t *t_onfault;     /* on_fault() setjmp buf */
 140         struct on_trap_data *t_ontrap;  /* on_trap() protection data */
 141         caddr_t t_swap;         /* the bottom of the stack, if from segkp */
 142         lock_t  t_lock;         /* used to resume() a thread */
 143         uint8_t t_lockstat;     /* set while thread is in lockstat code */
 144         uint8_t t_pil;          /* interrupt thread PIL */
 145         disp_lock_t     t_pi_lock;      /* lock protecting t_prioinv list */
 146         char    t_nomigrate;    /* do not migrate if set */
 147         struct cpu      *t_cpu; /* CPU that thread last ran on */
 148         struct cpu      *t_weakbound_cpu;       /* cpu weakly bound to */
 149         struct lgrp_ld  *t_lpl; /* load average for home lgroup */
 150         void            *t_lgrp_reserv[2];      /* reserved for future */
 151         struct _kthread *t_intr; /* interrupted (pinned) thread */
 152         uint64_t        t_intr_start;   /* timestamp when time slice began */
 153         kt_did_t        t_did;  /* thread id for kernel debuggers */
 154         caddr_t t_tnf_tpdp;     /* Trace facility data pointer */
 155         struct _kcpc_ctx *t_cpc_ctx;    /* performance counter context */
 156         struct _kcpc_set *t_cpc_set;    /* set this thread has bound */
 157 
 158         /*
 159          * non swappable part of the lwp state.
 160          */
 161         id_t            t_tid;          /* lwp's id */
 162         id_t            t_waitfor;      /* target lwp id in lwp_wait() */
 163         struct sigqueue *t_sigqueue;    /* queue of siginfo structs */
 164         k_sigset_t      t_sig;          /* signals pending to this process */
 165         k_sigset_t      t_extsig;       /* signals sent from another contract */
 166         k_sigset_t      t_hold;         /* hold signal bit mask */
 167         k_sigset_t      t_sigwait;      /* sigtimedwait/sigfd accepting these */
 168         struct  _kthread *t_forw;       /* process's forward thread link */
 169         struct  _kthread *t_back;       /* process's backward thread link */
 170         struct  _kthread *t_thlink;     /* tid (lwpid) lookup hash link */
 171         klwp_t  *t_lwp;                 /* thread's lwp pointer */
 172         struct  proc    *t_procp;       /* proc pointer */
 173         struct  t_audit_data *t_audit_data;     /* per thread audit data */
 174         struct  _kthread *t_next;       /* doubly linked list of all threads */
 175         struct  _kthread *t_prev;
 176         ushort_t t_whystop;             /* reason for stopping */
 177         ushort_t t_whatstop;            /* more detailed reason */
 178         int     t_dslot;                /* index in proc's thread directory */
 179         struct  pollstate *t_pollstate; /* state used during poll(2) */
 180         struct  pollcache *t_pollcache; /* to pass a pcache ptr by /dev/poll */
 181         struct  cred    *t_cred;        /* pointer to current cred */
 182         time_t  t_start;                /* start time, seconds since epoch */
 183         clock_t t_lbolt;                /* lbolt at last clock_tick() */
 184         hrtime_t t_stoptime;            /* timestamp at stop() */
 185         uint_t  t_pctcpu;               /* %cpu at last clock_tick(), binary */
 186                                         /* point at right of high-order bit */
 187         short   t_sysnum;               /* system call number */
 188         kcondvar_t      t_delay_cv;
 189         kmutex_t        t_delay_lock;
 190 
 191         /*
 192          * Pointer to the dispatcher lock protecting t_state and state-related
 193          * flags.  This pointer can change during waits on the lock, so
 194          * it should be grabbed only by thread_lock().
 195          */
 196         disp_lock_t     *t_lockp;       /* pointer to the dispatcher lock */
 197         ushort_t        t_oldspl;       /* spl level before dispatcher locked */
 198         volatile char   t_pre_sys;      /* pre-syscall work needed */
 199         lock_t          t_lock_flush;   /* for lock_mutex_flush() impl */
 200         struct _disp    *t_disp_queue;  /* run queue for chosen CPU */
 201         clock_t         t_disp_time;    /* last time this thread was running */
 202         uint_t          t_kpri_req;     /* kernel priority required */
 203 
 204         /*
 205          * Post-syscall / post-trap flags.
 206          *      No lock is required to set these.
 207          *      These must be cleared only by the thread itself.
 208          *
 209          *      t_astflag indicates that some post-trap processing is required,
 210          *              possibly a signal or a preemption.  The thread will not
 211          *              return to user with this set.
 212          *      t_post_sys indicates that some unusualy post-system call
 213          *              handling is required, such as an error or tracing.
 214          *      t_sig_check indicates that some condition in ISSIG() must be
 215          *              checked, but doesn't prevent returning to user.
 216          *      t_post_sys_ast is a way of checking whether any of these three
 217          *              flags are set.
 218          */
 219         union __tu {
 220                 struct __ts {
 221                         volatile char   _t_astflag;     /* AST requested */
 222                         volatile char   _t_sig_check;   /* ISSIG required */
 223                         volatile char   _t_post_sys;    /* post_syscall req */
 224                         volatile char   _t_trapret;     /* call CL_TRAPRET */
 225                 } _ts;
 226                 volatile int    _t_post_sys_ast;        /* OR of these flags */
 227         } _tu;
 228 #define t_astflag       _tu._ts._t_astflag
 229 #define t_sig_check     _tu._ts._t_sig_check
 230 #define t_post_sys      _tu._ts._t_post_sys
 231 #define t_trapret       _tu._ts._t_trapret
 232 #define t_post_sys_ast  _tu._t_post_sys_ast
 233 
 234         /*
 235          * Real time microstate profiling.
 236          */
 237                                         /* possible 4-byte filler */
 238         hrtime_t t_waitrq;              /* timestamp for run queue wait time */
 239         int     t_mstate;               /* current microstate */
 240         struct rprof {
 241                 int     rp_anystate;            /* set if any state non-zero */
 242                 uint_t  rp_state[NMSTATES];     /* mstate profiling counts */
 243         } *t_rprof;
 244 
 245         /*
 246          * There is a turnstile inserted into the list below for
 247          * every priority inverted synchronization object that
 248          * this thread holds.
 249          */
 250 
 251         struct turnstile *t_prioinv;
 252 
 253         /*
 254          * Pointer to the turnstile attached to the synchronization
 255          * object where this thread is blocked.
 256          */
 257 
 258         struct turnstile *t_ts;
 259 
 260         /*
 261          * kernel thread specific data
 262          *      Borrowed from userland implementation of POSIX tsd
 263          */
 264         struct tsd_thread {
 265                 struct tsd_thread *ts_next;     /* threads with TSD */
 266                 struct tsd_thread *ts_prev;     /* threads with TSD */
 267                 uint_t            ts_nkeys;     /* entries in value array */
 268                 void              **ts_value;   /* array of value/key */
 269         } *t_tsd;
 270 
 271         clock_t         t_stime;        /* time stamp used by the swapper */
 272         struct door_data *t_door;       /* door invocation data */
 273         kmutex_t        *t_plockp;      /* pointer to process's p_lock */
 274 
 275         struct sc_shared *t_schedctl;   /* scheduler activations shared data */
 276         uintptr_t       t_sc_uaddr;     /* user-level address of shared data */
 277 
 278         struct cpupart  *t_cpupart;     /* partition containing thread */
 279         int             t_bind_pset;    /* processor set binding */
 280 
 281         struct copyops  *t_copyops;     /* copy in/out ops vector */
 282 
 283         caddr_t         t_stkbase;      /* base of the the stack */
 284         struct page     *t_red_pp;      /* if non-NULL, redzone is mapped */
 285 
 286         afd_t           t_activefd;     /* active file descriptor table */
 287 
 288         struct _kthread *t_priforw;     /* sleepq per-priority sublist */
 289         struct _kthread *t_priback;
 290 
 291         struct sleepq   *t_sleepq;      /* sleep queue thread is waiting on */
 292         struct panic_trap_info *t_panic_trap;   /* saved data from fatal trap */
 293         int             *t_lgrp_affinity;       /* lgroup affinity */
 294         struct upimutex *t_upimutex;    /* list of upimutexes owned by thread */
 295         uint32_t        t_nupinest;     /* number of nested held upi mutexes */
 296         struct kproject *t_proj;        /* project containing this thread */
 297         uint8_t         t_unpark;       /* modified holding t_delay_lock */
 298         uint8_t         t_release;      /* lwp_release() waked up the thread */
 299         uint8_t         t_hatdepth;     /* depth of recursive hat_memloads */
 300         uint8_t         t_xpvcntr;      /* see xen_block_migrate() */
 301         kcondvar_t      t_joincv;       /* cv used to wait for thread exit */
 302         void            *t_taskq;       /* for threads belonging to taskq */
 303         hrtime_t        t_anttime;      /* most recent time anticipatory load */
 304                                         /*      was added to an lgroup's load */
 305                                         /*      on this thread's behalf */
 306         char            *t_pdmsg;       /* privilege debugging message */
 307 
 308         uint_t          t_predcache;    /* DTrace predicate cache */
 309         hrtime_t        t_dtrace_vtime; /* DTrace virtual time */
 310         hrtime_t        t_dtrace_start; /* DTrace slice start time */
 311 
 312         uint8_t         t_dtrace_stop;  /* indicates a DTrace-desired stop */
 313         uint8_t         t_dtrace_sig;   /* signal sent via DTrace's raise() */
 314 
 315         union __tdu {
 316                 struct __tds {
 317                         uint8_t _t_dtrace_on;   /* hit a fasttrap tracepoint */
 318                         uint8_t _t_dtrace_step; /* about to return to kernel */
 319                         uint8_t _t_dtrace_ret;  /* handling a return probe */
 320                         uint8_t _t_dtrace_ast;  /* saved ast flag */
 321 #ifdef __amd64
 322                         uint8_t _t_dtrace_reg;  /* modified register */
 323 #endif
 324                 } _tds;
 325                 ulong_t _t_dtrace_ft;           /* bitwise or of these flags */
 326         } _tdu;
 327 #define t_dtrace_ft     _tdu._t_dtrace_ft
 328 #define t_dtrace_on     _tdu._tds._t_dtrace_on
 329 #define t_dtrace_step   _tdu._tds._t_dtrace_step
 330 #define t_dtrace_ret    _tdu._tds._t_dtrace_ret
 331 #define t_dtrace_ast    _tdu._tds._t_dtrace_ast
 332 #ifdef __amd64
 333 #define t_dtrace_reg    _tdu._tds._t_dtrace_reg
 334 #endif
 335 
 336         uintptr_t       t_dtrace_pc;    /* DTrace saved pc from fasttrap */
 337         uintptr_t       t_dtrace_npc;   /* DTrace next pc from fasttrap */
 338         uintptr_t       t_dtrace_scrpc; /* DTrace per-thread scratch location */
 339         uintptr_t       t_dtrace_astpc; /* DTrace return sequence location */
 340 #ifdef __amd64
 341         uint64_t        t_dtrace_regv;  /* DTrace saved reg from fasttrap */
 342         uint64_t        t_useracc;      /* SMAP state saved across swtch() */
 343 #endif
 344         hrtime_t        t_hrtime;       /* high-res last time on cpu */
 345         kmutex_t        t_ctx_lock;     /* protects t_ctx in removectx() */
 346         struct waitq    *t_waitq;       /* wait queue */
 347         kmutex_t        t_wait_mutex;   /* used in CV wait functions */
 348 } kthread_t;
 349 
 350 /*
 351  * Thread flag (t_flag) definitions.
 352  *      These flags must be changed only for the current thread,
 353  *      and not during preemption code, since the code being
 354  *      preempted could be modifying the flags.
 355  *
 356  *      For the most part these flags do not need locking.
 357  *      The following flags will only be changed while the thread_lock is held,
 358  *      to give assurrance that they are consistent with t_state:
 359  *              T_WAKEABLE
 360  */
 361 #define T_INTR_THREAD   0x0001  /* thread is an interrupt thread */
 362 #define T_WAKEABLE      0x0002  /* thread is blocked, signals enabled */
 363 #define T_TOMASK        0x0004  /* use lwp_sigoldmask on return from signal */
 364 #define T_TALLOCSTK     0x0008  /* thread structure allocated from stk */
 365 #define T_FORKALL       0x0010  /* thread was cloned by forkall() */
 366 #define T_WOULDBLOCK    0x0020  /* for lockfs */
 367 #define T_DONTBLOCK     0x0040  /* for lockfs */
 368 #define T_DONTPEND      0x0080  /* for lockfs */
 369 #define T_SYS_PROF      0x0100  /* profiling on for duration of system call */
 370 #define T_WAITCVSEM     0x0200  /* waiting for a lwp_cv or lwp_sema on sleepq */
 371 #define T_WATCHPT       0x0400  /* thread undergoing a watchpoint emulation */
 372 #define T_PANIC         0x0800  /* thread initiated a system panic */
 373 #define T_LWPREUSE      0x1000  /* stack and LWP can be reused */
 374 #define T_CAPTURING     0x2000  /* thread is in page capture logic */
 375 #define T_VFPARENT      0x4000  /* thread is vfork parent, must call vfwait */
 376 #define T_DONTDTRACE    0x8000  /* disable DTrace probes */
 377 
 378 /*
 379  * Flags in t_proc_flag.
 380  *      These flags must be modified only when holding the p_lock
 381  *      for the associated process.
 382  */
 383 #define TP_DAEMON       0x0001  /* this is an LWP_DAEMON lwp */
 384 #define TP_HOLDLWP      0x0002  /* hold thread's lwp */
 385 #define TP_TWAIT        0x0004  /* wait to be freed by lwp_wait() */
 386 #define TP_LWPEXIT      0x0008  /* lwp has exited */
 387 #define TP_PRSTOP       0x0010  /* thread is being stopped via /proc */
 388 #define TP_CHKPT        0x0020  /* thread is being stopped via CPR checkpoint */
 389 #define TP_EXITLWP      0x0040  /* terminate this lwp */
 390 #define TP_PRVSTOP      0x0080  /* thread is virtually stopped via /proc */
 391 #define TP_MSACCT       0x0100  /* collect micro-state accounting information */
 392 #define TP_STOPPING     0x0200  /* thread is executing stop() */
 393 #define TP_WATCHPT      0x0400  /* process has watchpoints in effect */
 394 #define TP_PAUSE        0x0800  /* process is being stopped via pauselwps() */
 395 #define TP_CHANGEBIND   0x1000  /* thread has a new cpu/cpupart binding */
 396 #define TP_ZTHREAD      0x2000  /* this is a kernel thread for a zone */
 397 #define TP_WATCHSTOP    0x4000  /* thread is stopping via holdwatch() */
 398 
 399 /*
 400  * Thread scheduler flag (t_schedflag) definitions.
 401  *      The thread must be locked via thread_lock() or equiv. to change these.
 402  */
 403 #define TS_LOAD         0x0001  /* thread is in memory */
 404 #define TS_DONT_SWAP    0x0002  /* thread/lwp should not be swapped */
 405 #define TS_SWAPENQ      0x0004  /* swap thread when it reaches a safe point */
 406 #define TS_ON_SWAPQ     0x0008  /* thread is on the swap queue */
 407 #define TS_SIGNALLED    0x0010  /* thread was awakened by cv_signal() */
 408 #define TS_PROJWAITQ    0x0020  /* thread is on its project's waitq */
 409 #define TS_ZONEWAITQ    0x0040  /* thread is on its zone's waitq */
 410 #define TS_CSTART       0x0100  /* setrun() by continuelwps() */
 411 #define TS_UNPAUSE      0x0200  /* setrun() by unpauselwps() */
 412 #define TS_XSTART       0x0400  /* setrun() by SIGCONT */
 413 #define TS_PSTART       0x0800  /* setrun() by /proc */
 414 #define TS_RESUME       0x1000  /* setrun() by CPR resume process */
 415 #define TS_CREATE       0x2000  /* setrun() by syslwp_create() */
 416 #define TS_RUNQMATCH    0x4000  /* exact run queue balancing by setbackdq() */
 417 #define TS_ALLSTART     \
 418         (TS_CSTART|TS_UNPAUSE|TS_XSTART|TS_PSTART|TS_RESUME|TS_CREATE)
 419 #define TS_ANYWAITQ     (TS_PROJWAITQ|TS_ZONEWAITQ)
 420 
 421 /*
 422  * Thread binding types
 423  */
 424 #define TB_ALLHARD      0
 425 #define TB_CPU_SOFT     0x01            /* soft binding to CPU */
 426 #define TB_PSET_SOFT    0x02            /* soft binding to pset */
 427 
 428 #define TB_CPU_SOFT_SET(t)              ((t)->t_bindflag |= TB_CPU_SOFT)
 429 #define TB_CPU_HARD_SET(t)              ((t)->t_bindflag &= ~TB_CPU_SOFT)
 430 #define TB_PSET_SOFT_SET(t)             ((t)->t_bindflag |= TB_PSET_SOFT)
 431 #define TB_PSET_HARD_SET(t)             ((t)->t_bindflag &= ~TB_PSET_SOFT)
 432 #define TB_CPU_IS_SOFT(t)               ((t)->t_bindflag & TB_CPU_SOFT)
 433 #define TB_CPU_IS_HARD(t)               (!TB_CPU_IS_SOFT(t))
 434 #define TB_PSET_IS_SOFT(t)              ((t)->t_bindflag & TB_PSET_SOFT)
 435 
 436 /*
 437  * No locking needed for AST field.
 438  */
 439 #define aston(t)                ((t)->t_astflag = 1)
 440 #define astoff(t)               ((t)->t_astflag = 0)
 441 
 442 /* True if thread is stopped on an event of interest */
 443 #define ISTOPPED(t) ((t)->t_state == TS_STOPPED && \
 444                         !((t)->t_schedflag & TS_PSTART))
 445 
 446 /* True if thread is asleep and wakeable */
 447 #define ISWAKEABLE(t) (((t)->t_state == TS_SLEEP && \
 448                         ((t)->t_flag & T_WAKEABLE)))
 449 
 450 /* True if thread is on the wait queue */
 451 #define ISWAITING(t) ((t)->t_state == TS_WAIT)
 452 
 453 /* similar to ISTOPPED except the event of interest is CPR */
 454 #define CPR_ISTOPPED(t) ((t)->t_state == TS_STOPPED && \
 455                         !((t)->t_schedflag & TS_RESUME))
 456 
 457 /*
 458  * True if thread is virtually stopped (is or was asleep in
 459  * one of the lwp_*() system calls and marked to stop by /proc.)
 460  */
 461 #define VSTOPPED(t)     ((t)->t_proc_flag & TP_PRVSTOP)
 462 
 463 /* similar to VSTOPPED except the point of interest is CPR */
 464 #define CPR_VSTOPPED(t)                         \
 465         ((t)->t_state == TS_SLEEP &&         \
 466         (t)->t_wchan0 != NULL &&             \
 467         ((t)->t_flag & T_WAKEABLE) &&            \
 468         ((t)->t_proc_flag & TP_CHKPT))
 469 
 470 /* True if thread has been stopped by hold*() or was created stopped */
 471 #define SUSPENDED(t) ((t)->t_state == TS_STOPPED && \
 472         ((t)->t_schedflag & (TS_CSTART|TS_UNPAUSE)) != (TS_CSTART|TS_UNPAUSE))
 473 
 474 /* True if thread possesses an inherited priority */
 475 #define INHERITED(t)    ((t)->t_epri != 0)
 476 
 477 /* The dispatch priority of a thread */
 478 #define DISP_PRIO(t) ((t)->t_epri > (t)->t_pri ? (t)->t_epri : (t)->t_pri)
 479 
 480 /* The assigned priority of a thread */
 481 #define ASSIGNED_PRIO(t)        ((t)->t_pri)
 482 
 483 /*
 484  * Macros to determine whether a thread can be swapped.
 485  * If t_lock is held, the thread is either on a processor or being swapped.
 486  */
 487 #define SWAP_OK(t)      (!LOCK_HELD(&(t)->t_lock))
 488 
 489 /*
 490  * proctot(x)
 491  *      convert a proc pointer to a thread pointer. this only works with
 492  *      procs that have only one lwp.
 493  *
 494  * proctolwp(x)
 495  *      convert a proc pointer to a lwp pointer. this only works with
 496  *      procs that have only one lwp.
 497  *
 498  * ttolwp(x)
 499  *      convert a thread pointer to its lwp pointer.
 500  *
 501  * ttoproc(x)
 502  *      convert a thread pointer to its proc pointer.
 503  *
 504  * ttoproj(x)
 505  *      convert a thread pointer to its project pointer.
 506  *
 507  * ttozone(x)
 508  *      convert a thread pointer to its zone pointer.
 509  *
 510  * lwptot(x)
 511  *      convert a lwp pointer to its thread pointer.
 512  *
 513  * lwptoproc(x)
 514  *      convert a lwp to its proc pointer.
 515  */
 516 #define proctot(x)      ((x)->p_tlist)
 517 #define proctolwp(x)    ((x)->p_tlist->t_lwp)
 518 #define ttolwp(x)       ((x)->t_lwp)
 519 #define ttoproc(x)      ((x)->t_procp)
 520 #define ttoproj(x)      ((x)->t_proj)
 521 #define ttozone(x)      ((x)->t_procp->p_zone)
 522 #define lwptot(x)       ((x)->lwp_thread)
 523 #define lwptoproc(x)    ((x)->lwp_procp)
 524 
 525 #define t_pc            t_pcb.val[0]
 526 #define t_sp            t_pcb.val[1]
 527 
 528 #ifdef  _KERNEL
 529 
 530 extern  kthread_t       *threadp(void); /* inline, returns thread pointer */
 531 #define curthread       (threadp())             /* current thread pointer */
 532 #define curproc         (ttoproc(curthread))    /* current process pointer */
 533 #define curproj         (ttoproj(curthread))    /* current project pointer */
 534 #define curzone         (curproc->p_zone)    /* current zone pointer */
 535 
 536 extern  struct _kthread t0;             /* the scheduler thread */
 537 extern  kmutex_t        pidlock;        /* global process lock */
 538 
 539 /*
 540  * thread_free_lock is used by the tick accounting thread to keep a thread
 541  * from being freed while it is being examined.
 542  *
 543  * Thread structures are 32-byte aligned structures. That is why we use the
 544  * following formula.
 545  */
 546 #define THREAD_FREE_BITS        10
 547 #define THREAD_FREE_NUM         (1 << THREAD_FREE_BITS)
 548 #define THREAD_FREE_MASK        (THREAD_FREE_NUM - 1)
 549 #define THREAD_FREE_1           PTR24_LSB
 550 #define THREAD_FREE_2           (PTR24_LSB + THREAD_FREE_BITS)
 551 #define THREAD_FREE_SHIFT(t)    \
 552         (((ulong_t)(t) >> THREAD_FREE_1) ^ ((ulong_t)(t) >> THREAD_FREE_2))
 553 #define THREAD_FREE_HASH(t)     (THREAD_FREE_SHIFT(t) & THREAD_FREE_MASK)
 554 
 555 typedef struct thread_free_lock {
 556         kmutex_t        tf_lock;
 557         uchar_t         tf_pad[64 - sizeof (kmutex_t)];
 558 } thread_free_lock_t;
 559 
 560 extern void     thread_free_prevent(kthread_t *);
 561 extern void     thread_free_allow(kthread_t *);
 562 
 563 /*
 564  * Routines to change the priority and effective priority
 565  * of a thread-locked thread, whatever its state.
 566  */
 567 extern int      thread_change_pri(kthread_t *t, pri_t disp_pri, int front);
 568 extern void     thread_change_epri(kthread_t *t, pri_t disp_pri);
 569 
 570 /*
 571  * Routines that manipulate the dispatcher lock for the thread.
 572  * The locking heirarchy is as follows:
 573  *      cpu_lock > sleepq locks > run queue locks
 574  */
 575 void    thread_transition(kthread_t *); /* move to transition lock */
 576 void    thread_stop(kthread_t *);       /* move to stop lock */
 577 void    thread_lock(kthread_t *);       /* lock thread and its queue */
 578 void    thread_lock_high(kthread_t *);  /* lock thread and its queue */
 579 void    thread_onproc(kthread_t *, struct cpu *); /* set onproc state lock */
 580 
 581 #define thread_unlock(t)                disp_lock_exit((t)->t_lockp)
 582 #define thread_unlock_high(t)           disp_lock_exit_high((t)->t_lockp)
 583 #define thread_unlock_nopreempt(t)      disp_lock_exit_nopreempt((t)->t_lockp)
 584 
 585 #define THREAD_LOCK_HELD(t)     (DISP_LOCK_HELD((t)->t_lockp))
 586 
 587 extern disp_lock_t transition_lock;     /* lock protecting transiting threads */
 588 extern disp_lock_t stop_lock;           /* lock protecting stopped threads */
 589 
 590 caddr_t thread_stk_init(caddr_t);       /* init thread stack */
 591 
 592 extern int default_binding_mode;
 593 
 594 #endif  /* _KERNEL */
 595 
 596 /*
 597  * Macros to indicate that the thread holds resources that could be critical
 598  * to other kernel threads, so this thread needs to have kernel priority
 599  * if it blocks or is preempted.  Note that this is not necessary if the
 600  * resource is a mutex or a writer lock because of priority inheritance.
 601  *
 602  * The only way one thread may legally manipulate another thread's t_kpri_req
 603  * is to hold the target thread's thread lock while that thread is asleep.
 604  * (The rwlock code does this to implement direct handoff to waiting readers.)
 605  */
 606 #define THREAD_KPRI_REQUEST()   (curthread->t_kpri_req++)
 607 #define THREAD_KPRI_RELEASE()   (curthread->t_kpri_req--)
 608 #define THREAD_KPRI_RELEASE_N(n) (curthread->t_kpri_req -= (n))
 609 
 610 /*
 611  * Macro to change a thread's priority.
 612  */
 613 #define THREAD_CHANGE_PRI(t, pri) {                                     \
 614         pri_t __new_pri = (pri);                                        \
 615         DTRACE_SCHED2(change__pri, kthread_t *, (t), pri_t, __new_pri); \
 616         (t)->t_pri = __new_pri;                                              \
 617         schedctl_set_cidpri(t);                                         \
 618 }
 619 
 620 /*
 621  * Macro to indicate that a thread's priority is about to be changed.
 622  */
 623 #define THREAD_WILLCHANGE_PRI(t, pri) {                                 \
 624         DTRACE_SCHED2(change__pri, kthread_t *, (t), pri_t, (pri));     \
 625 }
 626 
 627 /*
 628  * Macros to change thread state and the associated lock.
 629  */
 630 #define THREAD_SET_STATE(tp, state, lp) \
 631                 ((tp)->t_state = state, (tp)->t_lockp = lp)
 632 
 633 /*
 634  * Point it at the transition lock, which is always held.
 635  * The previosly held lock is dropped.
 636  */
 637 #define THREAD_TRANSITION(tp)   thread_transition(tp);
 638 /*
 639  * Set the thread's lock to be the transition lock, without dropping
 640  * previosly held lock.
 641  */
 642 #define THREAD_TRANSITION_NOLOCK(tp)    ((tp)->t_lockp = &transition_lock)
 643 
 644 /*
 645  * Put thread in run state, and set the lock pointer to the dispatcher queue
 646  * lock pointer provided.  This lock should be held.
 647  */
 648 #define THREAD_RUN(tp, lp)      THREAD_SET_STATE(tp, TS_RUN, lp)
 649 
 650 /*
 651  * Put thread in wait state, and set the lock pointer to the wait queue
 652  * lock pointer provided.  This lock should be held.
 653  */
 654 #define THREAD_WAIT(tp, lp)     THREAD_SET_STATE(tp, TS_WAIT, lp)
 655 
 656 /*
 657  * Put thread in run state, and set the lock pointer to the dispatcher queue
 658  * lock pointer provided (i.e., the "swapped_lock").  This lock should be held.
 659  */
 660 #define THREAD_SWAP(tp, lp)     THREAD_SET_STATE(tp, TS_RUN, lp)
 661 
 662 /*
 663  * Put the thread in zombie state and set the lock pointer to NULL.
 664  * The NULL will catch anything that tries to lock a zombie.
 665  */
 666 #define THREAD_ZOMB(tp)         THREAD_SET_STATE(tp, TS_ZOMB, NULL)
 667 
 668 /*
 669  * Set the thread into ONPROC state, and point the lock at the CPUs
 670  * lock for the onproc thread(s).  This lock should be held, so the
 671  * thread deoes not become unlocked, since these stores can be reordered.
 672  */
 673 #define THREAD_ONPROC(tp, cpu)  \
 674                 THREAD_SET_STATE(tp, TS_ONPROC, &(cpu)->cpu_thread_lock)
 675 
 676 /*
 677  * Set the thread into the TS_SLEEP state, and set the lock pointer to
 678  * to some sleep queue's lock.  The new lock should already be held.
 679  */
 680 #define THREAD_SLEEP(tp, lp)    {                               \
 681                         disp_lock_t     *tlp;                   \
 682                         tlp = (tp)->t_lockp;                 \
 683                         THREAD_SET_STATE(tp, TS_SLEEP, lp);     \
 684                         disp_lock_exit_high(tlp);               \
 685                         }
 686 
 687 /*
 688  * Interrupt threads are created in TS_FREE state, and their lock
 689  * points at the associated CPU's lock.
 690  */
 691 #define THREAD_FREEINTR(tp, cpu)        \
 692                 THREAD_SET_STATE(tp, TS_FREE, &(cpu)->cpu_thread_lock)
 693 
 694 /* if tunable kmem_stackinfo is set, fill kthread stack with a pattern */
 695 #define KMEM_STKINFO_PATTERN    0xbadcbadcbadcbadcULL
 696 
 697 /*
 698  * If tunable kmem_stackinfo is set, log the latest KMEM_LOG_STK_USAGE_SIZE
 699  * dead kthreads that used their kernel stack the most.
 700  */
 701 #define KMEM_STKINFO_LOG_SIZE   16
 702 
 703 /* kthread name (cmd/lwpid) string size in the stackinfo log */
 704 #define KMEM_STKINFO_STR_SIZE   64
 705 
 706 /*
 707  * stackinfo logged data.
 708  */
 709 typedef struct kmem_stkinfo {
 710         caddr_t kthread;        /* kthread pointer */
 711         caddr_t t_startpc;      /* where kthread started */
 712         caddr_t start;          /* kthread stack start address */
 713         size_t  stksz;          /* kthread stack size */
 714         size_t  percent;        /* kthread stack high water mark */
 715         id_t    t_tid;          /* kthread id */
 716         char    cmd[KMEM_STKINFO_STR_SIZE];     /* kthread name (cmd/lwpid) */
 717 } kmem_stkinfo_t;
 718 
 719 #ifdef  __cplusplus
 720 }
 721 #endif
 722 
 723 #endif /* _SYS_THREAD_H */