sys/sys/thread.h

   1 /*
   2  * SYS/THREAD.H
   3  *
   4  *      Implements the architecture independant portion of the LWKT
   5  *      subsystem.
   6  *
   7  * Types which must already be defined when this header is included by
   8  * userland:    struct md_thread
   9  */
  10
  11 #ifndef _SYS_THREAD_H_
  12 #define _SYS_THREAD_H_
  13
  14 #ifndef _SYS_STDINT_H_
  15 #include <sys/stdint.h>         /* __int types */
  16 #endif
  17 #ifndef _SYS_PARAM_H_
  18 #include <sys/param.h>          /* MAXCOMLEN */
  19 #endif
  20 #ifndef _SYS_QUEUE_H_
  21 #include <sys/queue.h>          /* TAILQ_* macros */
  22 #endif
  23 #ifndef _SYS_MSGPORT_H_
  24 #include <sys/msgport.h>        /* lwkt_port */
  25 #endif
  26 #ifndef _SYS_TIME_H_
  27 #include <sys/time.h>           /* struct timeval */
  28 #endif
  29 #ifndef _SYS_LOCK_H
  30 #include <sys/lock.h>
  31 #endif
  32 #ifndef _SYS_SPINLOCK_H_
  33 #include <sys/spinlock.h>
  34 #endif
  35 #ifndef _SYS_IOSCHED_H_
  36 #include <sys/iosched.h>
  37 #endif
  38 #include <machine/thread.h>
  39
  40 struct globaldata;
  41 struct lwp;
  42 struct proc;
  43 struct thread;
  44 struct lwkt_queue;
  45 struct lwkt_token;
  46 struct lwkt_tokref;
  47 struct lwkt_ipiq;
  48 struct lwkt_cpu_msg;
  49 struct lwkt_cpu_port;
  50 struct lwkt_cpusync;
  51 union sysunion;
  52
  53 typedef struct lwkt_queue       *lwkt_queue_t;
  54 typedef struct lwkt_token       *lwkt_token_t;
  55 typedef struct lwkt_tokref      *lwkt_tokref_t;
  56 typedef struct lwkt_cpu_msg     *lwkt_cpu_msg_t;
  57 typedef struct lwkt_cpu_port    *lwkt_cpu_port_t;
  58 typedef struct lwkt_ipiq        *lwkt_ipiq_t;
  59 typedef struct lwkt_cpusync     *lwkt_cpusync_t;
  60 typedef struct thread           *thread_t;
  61
  62 typedef TAILQ_HEAD(lwkt_queue, thread) lwkt_queue;
  63
  64 /*
  65  * Differentiation between kernel threads and user threads.  Userland
  66  * programs which want to access to kernel structures have to define
  67  * _KERNEL_STRUCTURES.  This is a kinda safety valve to prevent badly
  68  * written user programs from getting an LWKT thread that is neither the
  69  * kernel nor the user version.
  70  */
  71 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  72 #ifndef _CPU_FRAME_H_
  73 #include <machine/frame.h>
  74 #endif
  75 #else
  76 struct intrframe;
  77 #endif
  78
  79 /*
  80  * Tokens are used to serialize access to information.  They are 'soft'
  81  * serialization entities that only stay in effect while a thread is
  82  * running.  If the thread blocks, other threads can run holding the same
  83  * token(s).  The tokens are reacquired when the original thread resumes.
  84  *
  85  * Tokens guarantee that no deadlock can happen regardless of type or
  86  * ordering.  However, obtaining the same token first shared, then
  87  * stacking exclusive, is not allowed and will panic.
  88  *
  89  * A thread can depend on its serialization remaining intact through a
  90  * preemption.  An interrupt which attempts to use the same token as the
  91  * thread being preempted will reschedule itself for non-preemptive
  92  * operation, so the new token code is capable of interlocking against
  93  * interrupts as well as other cpus.  This means that your token can only
  94  * be (temporarily) lost if you *explicitly* block.
  95  *
  96  * Tokens are managed through a helper reference structure, lwkt_tokref.  Each
  97  * thread has a stack of tokref's to keep track of acquired tokens.  Multiple
  98  * tokref's may reference the same token.
  99  *
 100  * EXCLUSIVE TOKENS
 101  *      Acquiring an exclusive token requires acquiring the EXCLUSIVE bit
 102  *      with count == 0.  If the exclusive bit cannot be acquired, EXCLREQ
 103  *      is set.  Once acquired, EXCLREQ is cleared (but could get set by
 104  *      another thread also trying for an exclusive lock at any time).
 105  *
 106  * SHARED TOKENS
 107  *      Acquiring a shared token requires waiting for the EXCLUSIVE bit
 108  *      to be cleared and then acquiring a count.  A shared lock request
 109  *      can temporarily acquire a count and then back it out if it is
 110  *      unable to obtain the EXCLUSIVE bit, allowing fetchadd to be used.
 111  *
 112  *      A thread attempting to get a single shared token will defer to
 113  *      pending exclusive requesters.  However, a thread already holding
 114  *      one or more tokens and trying to get an additional shared token
 115  *      cannot defer to exclusive requesters because doing so can lead
 116  *      to a deadlock.
 117  *
 118  * Multiple exclusive tokens are handled by treating the additional tokens
 119  * as a special case of the shared token, incrementing the count value.  This
 120  * reduces the complexity of the token release code.
 121  */
 122
 123 typedef struct lwkt_token {
 124     long                t_count;        /* Shared/exclreq/exclusive access */
 125     struct lwkt_tokref  *t_ref;         /* Exclusive ref */
 126     long                t_collisions;   /* Collision counter */
 127     const char          *t_desc;        /* Descriptive name */
 128 } lwkt_token;
 129
 130 #define TOK_EXCLUSIVE   0x00000001      /* Exclusive lock held */
 131 #define TOK_EXCLREQ     0x00000002      /* Exclusive request pending */
 132 #define TOK_INCR        4               /* Shared count increment */
 133 #define TOK_COUNTMASK   (~(long)(TOK_EXCLUSIVE|TOK_EXCLREQ))
 134
 135 /*
 136  * Static initialization for a lwkt_token.
 137  */
 138 #define LWKT_TOKEN_INITIALIZER(name)    \
 139 {                                       \
 140         .t_count = 0,                   \
 141         .t_ref = NULL,                  \
 142         .t_collisions = 0,              \
 143         .t_desc = #name                 \
 144 }
 145
 146 /*
 147  * Assert that a particular token is held
 148  */
 149 #define LWKT_TOKEN_HELD_ANY(tok)        _lwkt_token_held_any(tok, curthread)
 150 #define LWKT_TOKEN_HELD_EXCL(tok)       _lwkt_token_held_excl(tok, curthread)
 151
 152 #define ASSERT_LWKT_TOKEN_HELD(tok)             \
 153         KKASSERT(LWKT_TOKEN_HELD_ANY(tok))
 154
 155 #define ASSERT_LWKT_TOKEN_HELD_EXCL(tok)        \
 156         KKASSERT(LWKT_TOKEN_HELD_EXCL(tok))
 157
 158 #define ASSERT_NO_TOKENS_HELD(td)       \
 159         KKASSERT((td)->td_toks_stop == &td->td_toks_array[0])
 160
 161 struct lwkt_tokref {
 162     lwkt_token_t        tr_tok;         /* token in question */
 163     long                tr_count;       /* TOK_EXCLUSIVE|TOK_EXCLREQ or 0 */
 164     struct thread       *tr_owner;      /* me */
 165 };
 166
 167 #define MAXCPUFIFO      32      /* power of 2 */
 168 #define MAXCPUFIFO_MASK (MAXCPUFIFO - 1)
 169 #define LWKT_MAXTOKENS  32      /* max tokens beneficially held by thread */
 170
 171 /*
 172  * Always cast to ipifunc_t when registering an ipi.  The actual ipi function
 173  * is called with both the data and an interrupt frame, but the ipi function
 174  * that is registered might only declare a data argument.
 175  */
 176 typedef void (*ipifunc1_t)(void *arg);
 177 typedef void (*ipifunc2_t)(void *arg, int arg2);
 178 typedef void (*ipifunc3_t)(void *arg, int arg2, struct intrframe *frame);
 179
 180 struct lwkt_ipiq {
 181     int         ip_rindex;      /* only written by target cpu */
 182     int         ip_xindex;      /* written by target, indicates completion */
 183     int         ip_windex;      /* only written by source cpu */
 184     int         ip_drain;       /* drain source limit */
 185     struct {
 186         ipifunc3_t      func;
 187         void            *arg1;
 188         int             arg2;
 189         char            filler[32 - sizeof(int) - sizeof(void *) * 2];
 190     } ip_info[MAXCPUFIFO];
 191 };
 192
 193 /*
 194  * CPU Synchronization structure.  See lwkt_cpusync_start() and
 195  * lwkt_cpusync_finish() for more information.
 196  */
 197 typedef void (*cpusync_func_t)(void *arg);
 198
 199 struct lwkt_cpusync {
 200     cpumask_t   cs_mask;                /* cpus running the sync */
 201     cpumask_t   cs_mack;                /* mask acknowledge */
 202     cpusync_func_t cs_func;             /* function to execute */
 203     void        *cs_data;               /* function data */
 204 };
 205
 206 /*
 207  * The standard message and queue structure used for communications between
 208  * cpus.  Messages are typically queued via a machine-specific non-linked
 209  * FIFO matrix allowing any cpu to send a message to any other cpu without
 210  * blocking.
 211  */
 212 typedef struct lwkt_cpu_msg {
 213     void        (*cm_func)(lwkt_cpu_msg_t msg); /* primary dispatch function */
 214     int         cm_code;                /* request code if applicable */
 215     int         cm_cpu;                 /* reply to cpu */
 216     thread_t    cm_originator;          /* originating thread for wakeup */
 217 } lwkt_cpu_msg;
 218
 219 /*
 220  * Thread structure.  Note that ownership of a thread structure is special
 221  * cased and there is no 'token'.  A thread is always owned by the cpu
 222  * represented by td_gd, any manipulation of the thread by some other cpu
 223  * must be done through cpu_*msg() functions.  e.g. you could request
 224  * ownership of a thread that way, or hand a thread off to another cpu.
 225  *
 226  * NOTE: td_ucred is synchronized from the p_ucred on user->kernel syscall,
 227  *       trap, and AST/signal transitions to provide a stable ucred for
 228  *       (primarily) system calls.  This field will be NULL for pure kernel
 229  *       threads.
 230  */
 231 struct md_intr_info;
 232
 233 struct thread {
 234     TAILQ_ENTRY(thread) td_threadq;
 235     TAILQ_ENTRY(thread) td_allq;
 236     TAILQ_ENTRY(thread) td_sleepq;
 237     lwkt_port   td_msgport;     /* built-in message port for replies */
 238     struct lwp  *td_lwp;        /* (optional) associated lwp */
 239     struct proc *td_proc;       /* (optional) associated process */
 240     struct pcb  *td_pcb;        /* points to pcb and top of kstack */
 241     struct globaldata *td_gd;   /* associated with this cpu */
 242     const char  *td_wmesg;      /* string name for blockage */
 243     const volatile void *td_wchan;      /* waiting on channel */
 244     int         td_pri;         /* 0-31, 31=highest priority (note 1) */
 245     int         td_critcount;   /* critical section priority */
 246     u_int       td_flags;       /* TDF flags */
 247     int         td_wdomain;     /* domain for wchan address (typ 0) */
 248     void        (*td_preemptable)(struct thread *td, int critcount);
 249     void        (*td_release)(struct thread *td);
 250     char        *td_kstack;     /* kernel stack */
 251     int         td_kstack_size; /* size of kernel stack */
 252     char        *td_sp;         /* kernel stack pointer for LWKT restore */
 253     thread_t    (*td_switch)(struct thread *ntd);
 254     __uint64_t  td_uticks;      /* Statclock hits in user mode (uS) */
 255     __uint64_t  td_sticks;      /* Statclock hits in system mode (uS) */
 256     __uint64_t  td_iticks;      /* Statclock hits processing intr (uS) */
 257     int         td_locks;       /* lockmgr lock debugging */
 258     void        *td_unused01;   /* (future I/O scheduler heuristic) */
 259     int         td_refs;        /* hold position in gd_tdallq / hold free */
 260     int         td_nest_count;  /* prevent splz nesting */
 261     u_int       td_contended;   /* token contention count */
 262     u_int       td_mpflags;     /* flags can be set by foreign cpus */
 263     int         td_cscount;     /* cpu synchronization master */
 264     int         td_wakefromcpu; /* who woke me up? */
 265     int         td_upri;        /* user priority (sub-priority under td_pri) */
 266     int         td_type;        /* thread type, TD_TYPE_ */
 267     int         td_tracker;     /* for callers to debug lock counts */
 268     int         td_unused03[4]; /* for future fields */
 269     struct iosched_data td_iosdata;     /* Dynamic I/O scheduling data */
 270     struct timeval td_start;    /* start time for a thread/process */
 271     char        td_comm[MAXCOMLEN+1]; /* typ 16+1 bytes */
 272     struct thread *td_preempted; /* we preempted this thread */
 273     struct ucred *td_ucred;             /* synchronized from p_ucred */
 274     void         *td_vmm;       /* vmm private data */
 275     lwkt_tokref_t td_toks_have;         /* tokens we own */
 276     lwkt_tokref_t td_toks_stop;         /* tokens we want */
 277     struct lwkt_tokref td_toks_array[LWKT_MAXTOKENS];
 278     int         td_fairq_load;          /* fairq */
 279     int         td_fairq_count;         /* fairq */
 280     struct globaldata *td_migrate_gd;   /* target gd for thread migration */
 281 #ifdef DEBUG_CRIT_SECTIONS
 282 #define CRIT_DEBUG_ARRAY_SIZE   32
 283 #define CRIT_DEBUG_ARRAY_MASK   (CRIT_DEBUG_ARRAY_SIZE - 1)
 284     const char  *td_crit_debug_array[CRIT_DEBUG_ARRAY_SIZE];
 285     int         td_crit_debug_index;
 286     int         td_in_crit_report;
 287 #endif
 288     struct md_thread td_mach;
 289 #ifdef DEBUG_LOCKS
 290 #define SPINLOCK_DEBUG_ARRAY_SIZE       32
 291    int  td_spinlock_stack_id[SPINLOCK_DEBUG_ARRAY_SIZE];
 292    struct spinlock *td_spinlock_stack[SPINLOCK_DEBUG_ARRAY_SIZE];
 293    void         *td_spinlock_caller_pc[SPINLOCK_DEBUG_ARRAY_SIZE];
 294
 295     /*
 296      * Track lockmgr locks held; lk->lk_filename:lk->lk_lineno is the holder
 297      */
 298 #define LOCKMGR_DEBUG_ARRAY_SIZE        8
 299     int         td_lockmgr_stack_id[LOCKMGR_DEBUG_ARRAY_SIZE];
 300     struct lock *td_lockmgr_stack[LOCKMGR_DEBUG_ARRAY_SIZE];
 301 #endif
 302 };
 303
 304 #define td_toks_base            td_toks_array[0]
 305 #define td_toks_end             td_toks_array[LWKT_MAXTOKENS]
 306
 307 #define TD_TOKS_HELD(td)        ((td)->td_toks_stop != &(td)->td_toks_base)
 308 #define TD_TOKS_NOT_HELD(td)    ((td)->td_toks_stop == &(td)->td_toks_base)
 309
 310 /*
 311  * Thread flags.  Note that TDF_RUNNING is cleared on the old thread after
 312  * we switch to the new one, which is necessary because LWKTs don't need
 313  * to hold the BGL.  This flag is used by the exit code and the managed
 314  * thread migration code.  Note in addition that preemption will cause
 315  * TDF_RUNNING to be cleared temporarily, so any code checking TDF_RUNNING
 316  * must also check TDF_PREEMPT_LOCK.
 317  *
 318  * LWKT threads stay on their (per-cpu) run queue while running, not to
 319  * be confused with user processes which are removed from the user scheduling
 320  * run queue while actually running.
 321  *
 322  * td_threadq can represent the thread on one of three queues... the LWKT
 323  * run queue, a tsleep queue, or an lwkt blocking queue.  The LWKT subsystem
 324  * does not allow a thread to be scheduled if it already resides on some
 325  * queue.
 326  */
 327 #define TDF_RUNNING             0x00000001      /* thread still active */
 328 #define TDF_RUNQ                0x00000002      /* on an LWKT run queue */
 329 #define TDF_PREEMPT_LOCK        0x00000004      /* I have been preempted */
 330 #define TDF_PREEMPT_DONE        0x00000008      /* ac preemption complete */
 331 #define TDF_NOSTART             0x00000010      /* do not schedule on create */
 332 #define TDF_MIGRATING           0x00000020      /* thread is being migrated */
 333 #define TDF_SINTR               0x00000040      /* interruptability for 'ps' */
 334 #define TDF_TSLEEPQ             0x00000080      /* on a tsleep wait queue */
 335
 336 #define TDF_SYSTHREAD           0x00000100      /* reserve memory may be used */
 337 #define TDF_ALLOCATED_THREAD    0x00000200      /* objcache allocated thread */
 338 #define TDF_ALLOCATED_STACK     0x00000400      /* objcache allocated stack */
 339 #define TDF_VERBOSE             0x00000800      /* verbose on exit */
 340 #define TDF_DEADLKTREAT         0x00001000      /* special lockmgr treatment */
 341 #define TDF_MARKER              0x00002000      /* tdallq list scan marker */
 342 #define TDF_TIMEOUT_RUNNING     0x00004000      /* tsleep timeout race */
 343 #define TDF_TIMEOUT             0x00008000      /* tsleep timeout */
 344 #define TDF_INTTHREAD           0x00010000      /* interrupt thread */
 345 #define TDF_TSLEEP_DESCHEDULED  0x00020000      /* tsleep core deschedule */
 346 #define TDF_BLOCKED             0x00040000      /* Thread is blocked */
 347 #define TDF_PANICWARN           0x00080000      /* panic warning in switch */
 348 #define TDF_BLOCKQ              0x00100000      /* on block queue */
 349 #define TDF_FORCE_SPINPORT      0x00200000
 350 #define TDF_EXITING             0x00400000      /* thread exiting */
 351 #define TDF_USINGFP             0x00800000      /* thread using fp coproc */
 352 #define TDF_KERNELFP            0x01000000      /* kernel using fp coproc */
 353 #define TDF_DELAYED_WAKEUP      0x02000000
 354 #define TDF_FIXEDCPU            0x04000000      /* running cpu is fixed */
 355 #define TDF_USERMODE            0x08000000      /* in or entering user mode */
 356 #define TDF_NOFAULT             0x10000000      /* force onfault on fault */
 357
 358 #define TDF_MP_STOPREQ          0x00000001      /* suspend_kproc */
 359 #define TDF_MP_WAKEREQ          0x00000002      /* resume_kproc */
 360 #define TDF_MP_EXITWAIT         0x00000004      /* reaper, see lwp_wait() */
 361 #define TDF_MP_EXITSIG          0x00000008      /* reaper, see lwp_wait() */
 362 #define TDF_MP_BATCH_DEMARC     0x00000010      /* batch mode handling */
 363 #define TDF_MP_DIDYIELD         0x00000020      /* effects scheduling */
 364
 365 #define TD_TYPE_GENERIC         0               /* generic thread */
 366 #define TD_TYPE_CRYPTO          1               /* crypto thread */
 367 #define TD_TYPE_NETISR          2               /* netisr thread */
 368
 369 /*
 370  * Thread priorities.  Typically only one thread from any given
 371  * user process scheduling queue is on the LWKT run queue at a time.
 372  * Remember that there is one LWKT run queue per cpu.
 373  *
 374  * Critical sections are handled by bumping td_pri above TDPRI_MAX, which
 375  * causes interrupts to be masked as they occur.  When this occurs a
 376  * rollup flag will be set in mycpu->gd_reqflags.
 377  */
 378 #define TDPRI_IDLE_THREAD       0       /* the idle thread */
 379 #define TDPRI_IDLE_WORK         1       /* idle work (page zero, etc) */
 380 #define TDPRI_USER_SCHEDULER    2       /* user scheduler helper */
 381 #define TDPRI_USER_IDLE         4       /* user scheduler idle */
 382 #define TDPRI_USER_NORM         6       /* user scheduler normal */
 383 #define TDPRI_USER_REAL         8       /* user scheduler real time */
 384 #define TDPRI_KERN_LPSCHED      9       /* (comparison point only) */
 385 #define TDPRI_KERN_USER         10      /* kernel / block in syscall */
 386 #define TDPRI_KERN_DAEMON       12      /* kernel daemon (pageout, etc) */
 387 #define TDPRI_SOFT_NORM         14      /* kernel / normal */
 388 #define TDPRI_SOFT_TIMER        16      /* kernel / timer */
 389 #define TDPRI_UNUSED19          19
 390 #define TDPRI_INT_SUPPORT       20      /* kernel / high priority support */
 391 #define TDPRI_INT_LOW           27      /* low priority interrupt */
 392 #define TDPRI_INT_MED           28      /* medium priority interrupt */
 393 #define TDPRI_INT_HIGH          29      /* high priority interrupt */
 394 #define TDPRI_MAX               31
 395
 396 #define LWKT_THREAD_STACK       (UPAGES * PAGE_SIZE)
 397
 398 #define IN_CRITICAL_SECT(td)    ((td)->td_critcount)
 399
 400 #ifdef _KERNEL
 401
 402 /*
 403  * Global tokens
 404  */
 405 extern struct lwkt_token mp_token;
 406 extern struct lwkt_token pmap_token;
 407 extern struct lwkt_token dev_token;
 408 extern struct lwkt_token vm_token;
 409 extern struct lwkt_token vmspace_token;
 410 extern struct lwkt_token kvm_token;
 411 extern struct lwkt_token sigio_token;
 412 extern struct lwkt_token tty_token;
 413 extern struct lwkt_token vnode_token;
 414 extern struct lwkt_token revoke_token;
 415
 416 /*
 417  * Procedures
 418  */
 419 extern struct thread *lwkt_alloc_thread(struct thread *, int, int, int);
 420 extern void lwkt_init_thread(struct thread *, void *, int, int,
 421                              struct globaldata *);
 422 extern void lwkt_set_interrupt_support_thread(void);
 423 extern void lwkt_set_comm(thread_t, const char *, ...) __printflike(2, 3);
 424 extern void lwkt_free_thread(struct thread *);
 425 extern void lwkt_gdinit(struct globaldata *);
 426 extern void lwkt_switch(void);
 427 extern void lwkt_switch_return(struct thread *);
 428 extern void lwkt_preempt(thread_t, int);
 429 extern void lwkt_schedule(thread_t);
 430 extern void lwkt_schedule_noresched(thread_t);
 431 extern void lwkt_schedule_self(thread_t);
 432 extern void lwkt_deschedule(thread_t);
 433 extern void lwkt_deschedule_self(thread_t);
 434 extern void lwkt_yield(void);
 435 extern void lwkt_yield_quick(void);
 436 extern void lwkt_user_yield(void);
 437 extern void lwkt_hold(thread_t);
 438 extern void lwkt_rele(thread_t);
 439 extern void lwkt_passive_release(thread_t);
 440 extern void lwkt_maybe_splz(thread_t);
 441
 442 extern void lwkt_gettoken(lwkt_token_t);
 443 extern void lwkt_gettoken_shared(lwkt_token_t);
 444 extern int  lwkt_trytoken(lwkt_token_t);
 445 extern void lwkt_reltoken(lwkt_token_t);
 446 extern int  lwkt_cnttoken(lwkt_token_t, thread_t);
 447 extern int  lwkt_getalltokens(thread_t, int);
 448 extern void lwkt_relalltokens(thread_t);
 449 extern void lwkt_token_init(lwkt_token_t, const char *);
 450 extern void lwkt_token_uninit(lwkt_token_t);
 451
 452 extern void lwkt_token_pool_init(void);
 453 extern lwkt_token_t lwkt_token_pool_lookup(void *);
 454 extern lwkt_token_t lwkt_getpooltoken(void *);
 455 extern void lwkt_relpooltoken(void *);
 456
 457 extern void lwkt_token_swap(void);
 458
 459 extern void lwkt_setpri(thread_t, int);
 460 extern void lwkt_setpri_initial(thread_t, int);
 461 extern void lwkt_setpri_self(int);
 462 extern void lwkt_schedulerclock(thread_t td);
 463 extern void lwkt_setcpu_self(struct globaldata *);
 464 extern void lwkt_migratecpu(int);
 465
 466 extern void lwkt_giveaway(struct thread *);
 467 extern void lwkt_acquire(struct thread *);
 468 extern int  lwkt_send_ipiq3(struct globaldata *, ipifunc3_t, void *, int);
 469 extern int  lwkt_send_ipiq3_passive(struct globaldata *, ipifunc3_t,
 470                                     void *, int);
 471 extern int  lwkt_send_ipiq3_bycpu(int, ipifunc3_t, void *, int);
 472 extern int  lwkt_send_ipiq3_mask(cpumask_t, ipifunc3_t, void *, int);
 473 extern void lwkt_wait_ipiq(struct globaldata *, int);
 474 extern void lwkt_process_ipiq(void);
 475 extern void lwkt_process_ipiq_frame(struct intrframe *);
 476 extern void lwkt_smp_stopped(void);
 477 extern void lwkt_synchronize_ipiqs(const char *);
 478
 479 /* lwkt_cpusync_init() - inline function in sys/thread2.h */
 480 extern void lwkt_cpusync_simple(cpumask_t, cpusync_func_t, void *);
 481 extern void lwkt_cpusync_interlock(lwkt_cpusync_t);
 482 extern void lwkt_cpusync_deinterlock(lwkt_cpusync_t);
 483 extern void lwkt_cpusync_quick(lwkt_cpusync_t);
 484
 485 extern void crit_panic(void) __dead2;
 486 extern struct lwp *lwkt_preempted_proc(void);
 487
 488 extern int  lwkt_create (void (*func)(void *), void *, struct thread **,
 489                 struct thread *, int, int,
 490                 const char *, ...) __printflike(7, 8);
 491 extern void lwkt_exit (void) __dead2;
 492 extern void lwkt_remove_tdallq (struct thread *);
 493
 494 #endif
 495
 496 #endif
 497