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  * A thread can depend on its serialization remaining intact through a
  86  * preemption.  An interrupt which attempts to use the same token as the
  87  * thread being preempted will reschedule itself for non-preemptive
  88  * operation, so the new token code is capable of interlocking against
  89  * interrupts as well as other cpus.  This means that your token can only
  90  * be (temporarily) lost if you *explicitly* block.
  91  *
  92  * Tokens are managed through a helper reference structure, lwkt_tokref.  Each
  93  * thread has a stack of tokref's to keep track of acquired tokens.  Multiple
  94  * tokref's may reference the same token.
  95  *
  96  * Tokens can be held shared or exclusive.   An exclusive holder is able
  97  * to set the TOK_EXCLUSIVE bit in t_count as long as no bit in the count
  98  * mask is set.  If unable to accomplish this TOK_EXCLREQ can be set instead
  99  * which prevents any new shared acquisitions while the exclusive requestor
 100  * spins in the scheduler.  A shared holder can bump t_count by the increment
 101  * value as long as neither TOK_EXCLUSIVE or TOK_EXCLREQ is set, else spin
 102  * in the scheduler.
 103  *
 104  * Multiple exclusive tokens are handled by treating the additional tokens
 105  * as a special case of the shared token, incrementing the count value.  This
 106  * reduces the complexity of the token release code.
 107  */
 108
 109 typedef struct lwkt_token {
 110     long                t_count;        /* Shared/exclreq/exclusive access */
 111     struct lwkt_tokref  *t_ref;         /* Exclusive ref */
 112     long                t_collisions;   /* Collision counter */
 113     const char          *t_desc;        /* Descriptive name */
 114 } lwkt_token;
 115
 116 #define TOK_EXCLUSIVE   0x00000001      /* Exclusive lock held */
 117 #define TOK_EXCLREQ     0x00000002      /* Exclusive request pending */
 118 #define TOK_INCR        4               /* Shared count increment */
 119 #define TOK_COUNTMASK   (~(long)(TOK_EXCLUSIVE|TOK_EXCLREQ))
 120
 121 /*
 122  * Static initialization for a lwkt_token.
 123  */
 124 #define LWKT_TOKEN_INITIALIZER(name)    \
 125 {                                       \
 126         .t_count = 0,                   \
 127         .t_ref = NULL,                  \
 128         .t_collisions = 0,              \
 129         .t_desc = #name                 \
 130 }
 131
 132 /*
 133  * Assert that a particular token is held
 134  */
 135 #define LWKT_TOKEN_HELD_ANY(tok)        _lwkt_token_held_any(tok, curthread)
 136 #define LWKT_TOKEN_HELD_EXCL(tok)       _lwkt_token_held_excl(tok, curthread)
 137
 138 #define ASSERT_LWKT_TOKEN_HELD(tok)             \
 139         KKASSERT(LWKT_TOKEN_HELD_ANY(tok))
 140
 141 #define ASSERT_LWKT_TOKEN_HELD_EXCL(tok)        \
 142         KKASSERT(LWKT_TOKEN_HELD_EXCL(tok))
 143
 144 #define ASSERT_NO_TOKENS_HELD(td)       \
 145         KKASSERT((td)->td_toks_stop == &td->td_toks_array[0])
 146
 147 /*
 148  * Assert that a particular token is held and we are in a hard
 149  * code execution section (interrupt, ipi, or hard code section).
 150  * Hard code sections are not allowed to block or potentially block.
 151  * e.g. lwkt_gettoken() would only be ok if the token were already
 152  * held.
 153  */
 154 #define ASSERT_LWKT_TOKEN_HARD(tok)                                     \
 155         do {                                                            \
 156                 globaldata_t zgd __debugvar = mycpu;                    \
 157                 KKASSERT((tok)->t_ref &&                                \
 158                          (tok)->t_ref->tr_owner == zgd->gd_curthread && \
 159                          zgd->gd_intr_nesting_level > 0);               \
 160         } while(0)
 161
 162 /*
 163  * Assert that a particular token is held and we are in a normal
 164  * critical section.  Critical sections will not be preempted but
 165  * can explicitly block (tsleep, lwkt_gettoken, etc).
 166  */
 167 #define ASSERT_LWKT_TOKEN_CRIT(tok)                                     \
 168         do {                                                            \
 169                 globaldata_t zgd __debugvar = mycpu;                    \
 170                 KKASSERT((tok)->t_ref &&                                \
 171                          (tok)->t_ref->tr_owner == zgd->gd_curthread && \
 172                          zgd->gd_curthread->td_critcount > 0);          \
 173         } while(0)
 174
 175 struct lwkt_tokref {
 176     lwkt_token_t        tr_tok;         /* token in question */
 177     long                tr_count;       /* TOK_EXCLUSIVE|TOK_EXCLREQ or 0 */
 178     struct thread       *tr_owner;      /* me */
 179 };
 180
 181 #define MAXCPUFIFO      32      /* power of 2 */
 182 #define MAXCPUFIFO_MASK (MAXCPUFIFO - 1)
 183 #define LWKT_MAXTOKENS  32      /* max tokens beneficially held by thread */
 184
 185 /*
 186  * Always cast to ipifunc_t when registering an ipi.  The actual ipi function
 187  * is called with both the data and an interrupt frame, but the ipi function
 188  * that is registered might only declare a data argument.
 189  */
 190 typedef void (*ipifunc1_t)(void *arg);
 191 typedef void (*ipifunc2_t)(void *arg, int arg2);
 192 typedef void (*ipifunc3_t)(void *arg, int arg2, struct intrframe *frame);
 193
 194 struct lwkt_ipiq {
 195     int         ip_rindex;      /* only written by target cpu */
 196     int         ip_xindex;      /* written by target, indicates completion */
 197     int         ip_windex;      /* only written by source cpu */
 198     int         ip_drain;       /* drain source limit */
 199     struct {
 200         ipifunc3_t      func;
 201         void            *arg1;
 202         int             arg2;
 203         char            filler[32 - sizeof(int) - sizeof(void *) * 2];
 204     } ip_info[MAXCPUFIFO];
 205 };
 206
 207 /*
 208  * CPU Synchronization structure.  See lwkt_cpusync_start() and
 209  * lwkt_cpusync_finish() for more information.
 210  */
 211 typedef void (*cpusync_func_t)(void *arg);
 212
 213 struct lwkt_cpusync {
 214     cpumask_t   cs_mask;                /* cpus running the sync */
 215     cpumask_t   cs_mack;                /* mask acknowledge */
 216     cpusync_func_t cs_func;             /* function to execute */
 217     void        *cs_data;               /* function data */
 218 };
 219
 220 /*
 221  * The standard message and queue structure used for communications between
 222  * cpus.  Messages are typically queued via a machine-specific non-linked
 223  * FIFO matrix allowing any cpu to send a message to any other cpu without
 224  * blocking.
 225  */
 226 typedef struct lwkt_cpu_msg {
 227     void        (*cm_func)(lwkt_cpu_msg_t msg); /* primary dispatch function */
 228     int         cm_code;                /* request code if applicable */
 229     int         cm_cpu;                 /* reply to cpu */
 230     thread_t    cm_originator;          /* originating thread for wakeup */
 231 } lwkt_cpu_msg;
 232
 233 /*
 234  * Thread structure.  Note that ownership of a thread structure is special
 235  * cased and there is no 'token'.  A thread is always owned by the cpu
 236  * represented by td_gd, any manipulation of the thread by some other cpu
 237  * must be done through cpu_*msg() functions.  e.g. you could request
 238  * ownership of a thread that way, or hand a thread off to another cpu.
 239  *
 240  * NOTE: td_ucred is synchronized from the p_ucred on user->kernel syscall,
 241  *       trap, and AST/signal transitions to provide a stable ucred for
 242  *       (primarily) system calls.  This field will be NULL for pure kernel
 243  *       threads.
 244  */
 245 struct md_intr_info;
 246
 247 struct thread {
 248     TAILQ_ENTRY(thread) td_threadq;
 249     TAILQ_ENTRY(thread) td_allq;
 250     TAILQ_ENTRY(thread) td_sleepq;
 251     lwkt_port   td_msgport;     /* built-in message port for replies */
 252     struct lwp  *td_lwp;        /* (optional) associated lwp */
 253     struct proc *td_proc;       /* (optional) associated process */
 254     struct pcb  *td_pcb;        /* points to pcb and top of kstack */
 255     struct globaldata *td_gd;   /* associated with this cpu */
 256     const char  *td_wmesg;      /* string name for blockage */
 257     const volatile void *td_wchan;      /* waiting on channel */
 258     int         td_pri;         /* 0-31, 31=highest priority (note 1) */
 259     int         td_critcount;   /* critical section priority */
 260     u_int       td_flags;       /* TDF flags */
 261     int         td_wdomain;     /* domain for wchan address (typ 0) */
 262     void        (*td_preemptable)(struct thread *td, int critcount);
 263     void        (*td_release)(struct thread *td);
 264     char        *td_kstack;     /* kernel stack */
 265     int         td_kstack_size; /* size of kernel stack */
 266     char        *td_sp;         /* kernel stack pointer for LWKT restore */
 267     thread_t    (*td_switch)(struct thread *ntd);
 268     __uint64_t  td_uticks;      /* Statclock hits in user mode (uS) */
 269     __uint64_t  td_sticks;      /* Statclock hits in system mode (uS) */
 270     __uint64_t  td_iticks;      /* Statclock hits processing intr (uS) */
 271     int         td_locks;       /* lockmgr lock debugging */
 272     void        *td_unused01;   /* (future I/O scheduler heuristic) */
 273     int         td_refs;        /* hold position in gd_tdallq / hold free */
 274     int         td_nest_count;  /* prevent splz nesting */
 275     int         td_contended;   /* token contention count */
 276     u_int       td_mpflags;     /* flags can be set by foreign cpus */
 277     int         td_cscount;     /* cpu synchronization master */
 278     int         td_wakefromcpu; /* who woke me up? */
 279     int         td_upri;        /* user priority (sub-priority under td_pri) */
 280     int         td_type;        /* thread type, TD_TYPE_ */
 281     int         td_tracker;     /* for callers to debug lock counts */
 282     int         td_unused03[4]; /* for future fields */
 283     struct iosched_data td_iosdata;     /* Dynamic I/O scheduling data */
 284     struct timeval td_start;    /* start time for a thread/process */
 285     char        td_comm[MAXCOMLEN+1]; /* typ 16+1 bytes */
 286     struct thread *td_preempted; /* we preempted this thread */
 287     struct ucred *td_ucred;             /* synchronized from p_ucred */
 288     void         *td_vmm;       /* vmm private data */
 289     lwkt_tokref_t td_toks_have;         /* tokens we own */
 290     lwkt_tokref_t td_toks_stop;         /* tokens we want */
 291     struct lwkt_tokref td_toks_array[LWKT_MAXTOKENS];
 292     int         td_fairq_load;          /* fairq */
 293     int         td_fairq_count;         /* fairq */
 294     struct globaldata *td_migrate_gd;   /* target gd for thread migration */
 295 #ifdef DEBUG_CRIT_SECTIONS
 296 #define CRIT_DEBUG_ARRAY_SIZE   32
 297 #define CRIT_DEBUG_ARRAY_MASK   (CRIT_DEBUG_ARRAY_SIZE - 1)
 298     const char  *td_crit_debug_array[CRIT_DEBUG_ARRAY_SIZE];
 299     int         td_crit_debug_index;
 300     int         td_in_crit_report;
 301 #endif
 302     struct md_thread td_mach;
 303 #ifdef DEBUG_LOCKS
 304 #define SPINLOCK_DEBUG_ARRAY_SIZE       32
 305    int  td_spinlock_stack_id[SPINLOCK_DEBUG_ARRAY_SIZE];
 306    struct spinlock *td_spinlock_stack[SPINLOCK_DEBUG_ARRAY_SIZE];
 307    void         *td_spinlock_caller_pc[SPINLOCK_DEBUG_ARRAY_SIZE];
 308
 309     /*
 310      * Track lockmgr locks held; lk->lk_filename:lk->lk_lineno is the holder
 311      */
 312 #define LOCKMGR_DEBUG_ARRAY_SIZE        8
 313     int         td_lockmgr_stack_id[LOCKMGR_DEBUG_ARRAY_SIZE];
 314     struct lock *td_lockmgr_stack[LOCKMGR_DEBUG_ARRAY_SIZE];
 315 #endif
 316 };
 317
 318 #define td_toks_base            td_toks_array[0]
 319 #define td_toks_end             td_toks_array[LWKT_MAXTOKENS]
 320
 321 #define TD_TOKS_HELD(td)        ((td)->td_toks_stop != &(td)->td_toks_base)
 322 #define TD_TOKS_NOT_HELD(td)    ((td)->td_toks_stop == &(td)->td_toks_base)
 323
 324 /*
 325  * Thread flags.  Note that TDF_RUNNING is cleared on the old thread after
 326  * we switch to the new one, which is necessary because LWKTs don't need
 327  * to hold the BGL.  This flag is used by the exit code and the managed
 328  * thread migration code.  Note in addition that preemption will cause
 329  * TDF_RUNNING to be cleared temporarily, so any code checking TDF_RUNNING
 330  * must also check TDF_PREEMPT_LOCK.
 331  *
 332  * LWKT threads stay on their (per-cpu) run queue while running, not to
 333  * be confused with user processes which are removed from the user scheduling
 334  * run queue while actually running.
 335  *
 336  * td_threadq can represent the thread on one of three queues... the LWKT
 337  * run queue, a tsleep queue, or an lwkt blocking queue.  The LWKT subsystem
 338  * does not allow a thread to be scheduled if it already resides on some
 339  * queue.
 340  */
 341 #define TDF_RUNNING             0x00000001      /* thread still active */
 342 #define TDF_RUNQ                0x00000002      /* on an LWKT run queue */
 343 #define TDF_PREEMPT_LOCK        0x00000004      /* I have been preempted */
 344 #define TDF_PREEMPT_DONE        0x00000008      /* ac preemption complete */
 345 #define TDF_NOSTART             0x00000010      /* do not schedule on create */
 346 #define TDF_MIGRATING           0x00000020      /* thread is being migrated */
 347 #define TDF_SINTR               0x00000040      /* interruptability for 'ps' */
 348 #define TDF_TSLEEPQ             0x00000080      /* on a tsleep wait queue */
 349
 350 #define TDF_SYSTHREAD           0x00000100      /* reserve memory may be used */
 351 #define TDF_ALLOCATED_THREAD    0x00000200      /* objcache allocated thread */
 352 #define TDF_ALLOCATED_STACK     0x00000400      /* objcache allocated stack */
 353 #define TDF_VERBOSE             0x00000800      /* verbose on exit */
 354 #define TDF_DEADLKTREAT         0x00001000      /* special lockmgr treatment */
 355 #define TDF_MARKER              0x00002000      /* tdallq list scan marker */
 356 #define TDF_TIMEOUT_RUNNING     0x00004000      /* tsleep timeout race */
 357 #define TDF_TIMEOUT             0x00008000      /* tsleep timeout */
 358 #define TDF_INTTHREAD           0x00010000      /* interrupt thread */
 359 #define TDF_TSLEEP_DESCHEDULED  0x00020000      /* tsleep core deschedule */
 360 #define TDF_BLOCKED             0x00040000      /* Thread is blocked */
 361 #define TDF_PANICWARN           0x00080000      /* panic warning in switch */
 362 #define TDF_BLOCKQ              0x00100000      /* on block queue */
 363 #define TDF_FORCE_SPINPORT      0x00200000
 364 #define TDF_EXITING             0x00400000      /* thread exiting */
 365 #define TDF_USINGFP             0x00800000      /* thread using fp coproc */
 366 #define TDF_KERNELFP            0x01000000      /* kernel using fp coproc */
 367 #define TDF_DELAYED_WAKEUP      0x02000000
 368 #define TDF_FIXEDCPU            0x04000000      /* running cpu is fixed */
 369 #define TDF_USERMODE            0x08000000      /* in or entering user mode */
 370 #define TDF_NOFAULT             0x10000000      /* force onfault on fault */
 371
 372 #define TDF_MP_STOPREQ          0x00000001      /* suspend_kproc */
 373 #define TDF_MP_WAKEREQ          0x00000002      /* resume_kproc */
 374 #define TDF_MP_EXITWAIT         0x00000004      /* reaper, see lwp_wait() */
 375 #define TDF_MP_EXITSIG          0x00000008      /* reaper, see lwp_wait() */
 376 #define TDF_MP_BATCH_DEMARC     0x00000010      /* batch mode handling */
 377 #define TDF_MP_DIDYIELD         0x00000020      /* effects scheduling */
 378
 379 #define TD_TYPE_GENERIC         0               /* generic thread */
 380 #define TD_TYPE_CRYPTO          1               /* crypto thread */
 381 #define TD_TYPE_NETISR          2               /* netisr thread */
 382
 383 /*
 384  * Thread priorities.  Typically only one thread from any given
 385  * user process scheduling queue is on the LWKT run queue at a time.
 386  * Remember that there is one LWKT run queue per cpu.
 387  *
 388  * Critical sections are handled by bumping td_pri above TDPRI_MAX, which
 389  * causes interrupts to be masked as they occur.  When this occurs a
 390  * rollup flag will be set in mycpu->gd_reqflags.
 391  */
 392 #define TDPRI_IDLE_THREAD       0       /* the idle thread */
 393 #define TDPRI_IDLE_WORK         1       /* idle work (page zero, etc) */
 394 #define TDPRI_USER_SCHEDULER    2       /* user scheduler helper */
 395 #define TDPRI_USER_IDLE         4       /* user scheduler idle */
 396 #define TDPRI_USER_NORM         6       /* user scheduler normal */
 397 #define TDPRI_USER_REAL         8       /* user scheduler real time */
 398 #define TDPRI_KERN_LPSCHED      9       /* (comparison point only) */
 399 #define TDPRI_KERN_USER         10      /* kernel / block in syscall */
 400 #define TDPRI_KERN_DAEMON       12      /* kernel daemon (pageout, etc) */
 401 #define TDPRI_SOFT_NORM         14      /* kernel / normal */
 402 #define TDPRI_SOFT_TIMER        16      /* kernel / timer */
 403 #define TDPRI_UNUSED19          19
 404 #define TDPRI_INT_SUPPORT       20      /* kernel / high priority support */
 405 #define TDPRI_INT_LOW           27      /* low priority interrupt */
 406 #define TDPRI_INT_MED           28      /* medium priority interrupt */
 407 #define TDPRI_INT_HIGH          29      /* high priority interrupt */
 408 #define TDPRI_MAX               31
 409
 410 #define LWKT_THREAD_STACK       (UPAGES * PAGE_SIZE)
 411
 412 #define IN_CRITICAL_SECT(td)    ((td)->td_critcount)
 413
 414 #ifdef _KERNEL
 415
 416 /*
 417  * Global tokens
 418  */
 419 extern struct lwkt_token mp_token;
 420 extern struct lwkt_token pmap_token;
 421 extern struct lwkt_token dev_token;
 422 extern struct lwkt_token vm_token;
 423 extern struct lwkt_token vmspace_token;
 424 extern struct lwkt_token kvm_token;
 425 extern struct lwkt_token sigio_token;
 426 extern struct lwkt_token tty_token;
 427 extern struct lwkt_token vnode_token;
 428 extern struct lwkt_token revoke_token;
 429
 430 /*
 431  * Procedures
 432  */
 433 extern struct thread *lwkt_alloc_thread(struct thread *, int, int, int);
 434 extern void lwkt_init_thread(struct thread *, void *, int, int,
 435                              struct globaldata *);
 436 extern void lwkt_set_interrupt_support_thread(void);
 437 extern void lwkt_set_comm(thread_t, const char *, ...) __printflike(2, 3);
 438 extern void lwkt_free_thread(struct thread *);
 439 extern void lwkt_gdinit(struct globaldata *);
 440 extern void lwkt_switch(void);
 441 extern void lwkt_switch_return(struct thread *);
 442 extern void lwkt_preempt(thread_t, int);
 443 extern void lwkt_schedule(thread_t);
 444 extern void lwkt_schedule_noresched(thread_t);
 445 extern void lwkt_schedule_self(thread_t);
 446 extern void lwkt_deschedule(thread_t);
 447 extern void lwkt_deschedule_self(thread_t);
 448 extern void lwkt_yield(void);
 449 extern void lwkt_yield_quick(void);
 450 extern void lwkt_user_yield(void);
 451 extern void lwkt_hold(thread_t);
 452 extern void lwkt_rele(thread_t);
 453 extern void lwkt_passive_release(thread_t);
 454 extern void lwkt_maybe_splz(thread_t);
 455
 456 extern void lwkt_gettoken(lwkt_token_t);
 457 extern void lwkt_gettoken_shared(lwkt_token_t);
 458 extern void lwkt_gettoken_hard(lwkt_token_t);
 459 extern int  lwkt_trytoken(lwkt_token_t);
 460 extern void lwkt_reltoken(lwkt_token_t);
 461 extern void lwkt_reltoken_hard(lwkt_token_t);
 462 extern int  lwkt_cnttoken(lwkt_token_t, thread_t);
 463 extern int  lwkt_getalltokens(thread_t, int);
 464 extern void lwkt_relalltokens(thread_t);
 465 extern void lwkt_token_init(lwkt_token_t, const char *);
 466 extern void lwkt_token_uninit(lwkt_token_t);
 467
 468 extern void lwkt_token_pool_init(void);
 469 extern lwkt_token_t lwkt_token_pool_lookup(void *);
 470 extern lwkt_token_t lwkt_getpooltoken(void *);
 471 extern void lwkt_relpooltoken(void *);
 472
 473 extern void lwkt_token_swap(void);
 474
 475 extern void lwkt_setpri(thread_t, int);
 476 extern void lwkt_setpri_initial(thread_t, int);
 477 extern void lwkt_setpri_self(int);
 478 extern void lwkt_schedulerclock(thread_t td);
 479 extern void lwkt_setcpu_self(struct globaldata *);
 480 extern void lwkt_migratecpu(int);
 481
 482 extern void lwkt_giveaway(struct thread *);
 483 extern void lwkt_acquire(struct thread *);
 484 extern int  lwkt_send_ipiq3(struct globaldata *, ipifunc3_t, void *, int);
 485 extern int  lwkt_send_ipiq3_passive(struct globaldata *, ipifunc3_t,
 486                                     void *, int);
 487 extern int  lwkt_send_ipiq3_bycpu(int, ipifunc3_t, void *, int);
 488 extern int  lwkt_send_ipiq3_mask(cpumask_t, ipifunc3_t, void *, int);
 489 extern void lwkt_wait_ipiq(struct globaldata *, int);
 490 extern void lwkt_process_ipiq(void);
 491 extern void lwkt_process_ipiq_frame(struct intrframe *);
 492 extern void lwkt_smp_stopped(void);
 493 extern void lwkt_synchronize_ipiqs(const char *);
 494
 495 /* lwkt_cpusync_init() - inline function in sys/thread2.h */
 496 extern void lwkt_cpusync_simple(cpumask_t, cpusync_func_t, void *);
 497 extern void lwkt_cpusync_interlock(lwkt_cpusync_t);
 498 extern void lwkt_cpusync_deinterlock(lwkt_cpusync_t);
 499 extern void lwkt_cpusync_quick(lwkt_cpusync_t);
 500
 501 extern void crit_panic(void) __dead2;
 502 extern struct lwp *lwkt_preempted_proc(void);
 503
 504 extern int  lwkt_create (void (*func)(void *), void *, struct thread **,
 505                 struct thread *, int, int,
 506                 const char *, ...) __printflike(7, 8);
 507 extern void lwkt_exit (void) __dead2;
 508 extern void lwkt_remove_tdallq (struct thread *);
 509
 510 #endif
 511
 512 #endif
 513