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_msg; 51 struct lwkt_port; 52 struct lwkt_cpusync; 53 union sysunion; 54 55 typedef struct lwkt_queue *lwkt_queue_t; 56 typedef struct lwkt_token *lwkt_token_t; 57 typedef struct lwkt_tokref *lwkt_tokref_t; 58 typedef struct lwkt_cpu_msg *lwkt_cpu_msg_t; 59 typedef struct lwkt_cpu_port *lwkt_cpu_port_t; 60 typedef struct lwkt_ipiq *lwkt_ipiq_t; 61 typedef struct lwkt_cpusync *lwkt_cpusync_t; 62 typedef struct thread *thread_t; 63 64 typedef TAILQ_HEAD(lwkt_queue, thread) lwkt_queue; 65 66 /* 67 * Differentiation between kernel threads and user threads. Userland 68 * programs which want to access to kernel structures have to define 69 * _KERNEL_STRUCTURES. This is a kinda safety valve to prevent badly 70 * written user programs from getting an LWKT thread that is neither the 71 * kernel nor the user version. 72 */ 73 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 74 #ifndef _MACHINE_THREAD_H_ 75 #include <machine/thread.h> /* md_thread */ 76 #endif 77 #ifndef _MACHINE_FRAME_H_ 78 #include <machine/frame.h> 79 #endif 80 #else 81 struct intrframe; 82 #endif 83 84 /* 85 * Tokens are used to serialize access to information. They are 'soft' 86 * serialization entities that only stay in effect while a thread is 87 * running. If the thread blocks, other threads can run holding the same 88 * token(s). The tokens are reacquired when the original thread resumes. 89 * 90 * A thread can depend on its serialization remaining intact through a 91 * preemption. An interrupt which attempts to use the same token as the 92 * thread being preempted will reschedule itself for non-preemptive 93 * operation, so the new token code is capable of interlocking against 94 * interrupts as well as other cpus. This means that your token can only 95 * be (temporarily) lost if you *explicitly* block. 96 * 97 * Tokens are managed through a helper reference structure, lwkt_tokref. Each 98 * thread has a stack of tokref's to keep track of acquired tokens. Multiple 99 * tokref's may reference the same token. 100 * 101 * Tokens can be held shared or exclusive. An exclusive holder is able 102 * to set the TOK_EXCLUSIVE bit in t_count as long as no bit in the count 103 * mask is set. If unable to accomplish this TOK_EXCLREQ can be set instead 104 * which prevents any new shared acquisitions while the exclusive requestor 105 * spins in the scheduler. A shared holder can bump t_count by the increment 106 * value as long as neither TOK_EXCLUSIVE or TOK_EXCLREQ is set, else spin 107 * in the scheduler. 108 * 109 * Multiple exclusive tokens are handled by treating the additional tokens 110 * as a special case of the shared token, incrementing the count value. This 111 * reduces the complexity of the token release code. 112 */ 113 114 typedef struct lwkt_token { 115 long t_count; /* Shared/exclreq/exclusive access */ 116 struct lwkt_tokref *t_ref; /* Exclusive ref */ 117 long t_collisions; /* Collision counter */ 118 const char *t_desc; /* Descriptive name */ 119 } lwkt_token; 120 121 #define TOK_EXCLUSIVE 0x00000001 /* Exclusive lock held */ 122 #define TOK_EXCLREQ 0x00000002 /* Exclusive request pending */ 123 #define TOK_INCR 4 /* Shared count increment */ 124 #define TOK_COUNTMASK (~(long)(TOK_EXCLUSIVE|TOK_EXCLREQ)) 125 126 /* 127 * Static initialization for a lwkt_token. 128 */ 129 #define LWKT_TOKEN_INITIALIZER(name) \ 130 { \ 131 .t_count = 0, \ 132 .t_ref = NULL, \ 133 .t_collisions = 0, \ 134 .t_desc = #name \ 135 } 136 137 /* 138 * Assert that a particular token is held 139 */ 140 #define LWKT_TOKEN_HELD_ANY(tok) _lwkt_token_held_any(tok, curthread) 141 #define LWKT_TOKEN_HELD_EXCL(tok) _lwkt_token_held_excl(tok, curthread) 142 143 #define ASSERT_LWKT_TOKEN_HELD(tok) \ 144 KKASSERT(LWKT_TOKEN_HELD_ANY(tok)) 145 146 #define ASSERT_LWKT_TOKEN_HELD_EXCL(tok) \ 147 KKASSERT(LWKT_TOKEN_HELD_EXCL(tok)) 148 149 #define ASSERT_NO_TOKENS_HELD(td) \ 150 KKASSERT((td)->td_toks_stop == &td->td_toks_array[0]) 151 152 /* 153 * Assert that a particular token is held and we are in a hard 154 * code execution section (interrupt, ipi, or hard code section). 155 * Hard code sections are not allowed to block or potentially block. 156 * e.g. lwkt_gettoken() would only be ok if the token were already 157 * held. 158 */ 159 #define ASSERT_LWKT_TOKEN_HARD(tok) \ 160 do { \ 161 globaldata_t zgd __debugvar = mycpu; \ 162 KKASSERT((tok)->t_ref && \ 163 (tok)->t_ref->tr_owner == zgd->gd_curthread && \ 164 zgd->gd_intr_nesting_level > 0); \ 165 } while(0) 166 167 /* 168 * Assert that a particular token is held and we are in a normal 169 * critical section. Critical sections will not be preempted but 170 * can explicitly block (tsleep, lwkt_gettoken, etc). 171 */ 172 #define ASSERT_LWKT_TOKEN_CRIT(tok) \ 173 do { \ 174 globaldata_t zgd __debugvar = mycpu; \ 175 KKASSERT((tok)->t_ref && \ 176 (tok)->t_ref->tr_owner == zgd->gd_curthread && \ 177 zgd->gd_curthread->td_critcount > 0); \ 178 } while(0) 179 180 struct lwkt_tokref { 181 lwkt_token_t tr_tok; /* token in question */ 182 long tr_count; /* TOK_EXCLUSIVE|TOK_EXCLREQ or 0 */ 183 struct thread *tr_owner; /* me */ 184 }; 185 186 #define MAXCPUFIFO 32 /* power of 2 */ 187 #define MAXCPUFIFO_MASK (MAXCPUFIFO - 1) 188 #define LWKT_MAXTOKENS 32 /* max tokens beneficially held by thread */ 189 190 /* 191 * Always cast to ipifunc_t when registering an ipi. The actual ipi function 192 * is called with both the data and an interrupt frame, but the ipi function 193 * that is registered might only declare a data argument. 194 */ 195 typedef void (*ipifunc1_t)(void *arg); 196 typedef void (*ipifunc2_t)(void *arg, int arg2); 197 typedef void (*ipifunc3_t)(void *arg, int arg2, struct intrframe *frame); 198 199 typedef struct lwkt_ipiq { 200 int ip_rindex; /* only written by target cpu */ 201 int ip_xindex; /* written by target, indicates completion */ 202 int ip_windex; /* only written by source cpu */ 203 struct { 204 ipifunc3_t func; 205 void *arg1; 206 int arg2; 207 char filler[32 - sizeof(int) - sizeof(void *) * 2]; 208 } ip_info[MAXCPUFIFO]; 209 } lwkt_ipiq; 210 211 /* 212 * CPU Synchronization structure. See lwkt_cpusync_start() and 213 * lwkt_cpusync_finish() for more information. 214 */ 215 typedef void (*cpusync_func_t)(void *arg); 216 217 struct lwkt_cpusync { 218 cpumask_t cs_mask; /* cpus running the sync */ 219 cpumask_t cs_mack; /* mask acknowledge */ 220 cpusync_func_t cs_func; /* function to execute */ 221 void *cs_data; /* function data */ 222 }; 223 224 /* 225 * The standard message and queue structure used for communications between 226 * cpus. Messages are typically queued via a machine-specific non-linked 227 * FIFO matrix allowing any cpu to send a message to any other cpu without 228 * blocking. 229 */ 230 typedef struct lwkt_cpu_msg { 231 void (*cm_func)(lwkt_cpu_msg_t msg); /* primary dispatch function */ 232 int cm_code; /* request code if applicable */ 233 int cm_cpu; /* reply to cpu */ 234 thread_t cm_originator; /* originating thread for wakeup */ 235 } lwkt_cpu_msg; 236 237 /* 238 * Thread structure. Note that ownership of a thread structure is special 239 * cased and there is no 'token'. A thread is always owned by the cpu 240 * represented by td_gd, any manipulation of the thread by some other cpu 241 * must be done through cpu_*msg() functions. e.g. you could request 242 * ownership of a thread that way, or hand a thread off to another cpu. 243 * 244 * NOTE: td_ucred is synchronized from the p_ucred on user->kernel syscall, 245 * trap, and AST/signal transitions to provide a stable ucred for 246 * (primarily) system calls. This field will be NULL for pure kernel 247 * threads. 248 */ 249 struct md_intr_info; 250 251 struct thread { 252 TAILQ_ENTRY(thread) td_threadq; 253 TAILQ_ENTRY(thread) td_allq; 254 TAILQ_ENTRY(thread) td_sleepq; 255 lwkt_port td_msgport; /* built-in message port for replies */ 256 struct lwp *td_lwp; /* (optional) associated lwp */ 257 struct proc *td_proc; /* (optional) associated process */ 258 struct pcb *td_pcb; /* points to pcb and top of kstack */ 259 struct globaldata *td_gd; /* associated with this cpu */ 260 const char *td_wmesg; /* string name for blockage */ 261 const volatile void *td_wchan; /* waiting on channel */ 262 int td_pri; /* 0-31, 31=highest priority (note 1) */ 263 int td_critcount; /* critical section priority */ 264 u_int td_flags; /* TDF flags */ 265 int td_wdomain; /* domain for wchan address (typ 0) */ 266 void (*td_preemptable)(struct thread *td, int critcount); 267 void (*td_release)(struct thread *td); 268 char *td_kstack; /* kernel stack */ 269 int td_kstack_size; /* size of kernel stack */ 270 char *td_sp; /* kernel stack pointer for LWKT restore */ 271 thread_t (*td_switch)(struct thread *ntd); 272 __uint64_t td_uticks; /* Statclock hits in user mode (uS) */ 273 __uint64_t td_sticks; /* Statclock hits in system mode (uS) */ 274 __uint64_t td_iticks; /* Statclock hits processing intr (uS) */ 275 int td_locks; /* lockmgr lock debugging */ 276 void *td_dsched_priv1; /* priv data for I/O schedulers */ 277 int td_refs; /* hold position in gd_tdallq / hold free */ 278 int td_nest_count; /* prevent splz nesting */ 279 int td_contended; /* token contention count */ 280 u_int td_mpflags; /* flags can be set by foreign cpus */ 281 int td_cscount; /* cpu synchronization master */ 282 int td_wakefromcpu; /* who woke me up? */ 283 int td_upri; /* user priority (sub-priority under td_pri) */ 284 int td_type; /* thread type, TD_TYPE_ */ 285 int td_unused02[1]; /* for future fields */ 286 int td_unused03[4]; /* for future fields */ 287 struct iosched_data td_iosdata; /* Dynamic I/O scheduling data */ 288 struct timeval td_start; /* start time for a thread/process */ 289 char td_comm[MAXCOMLEN+1]; /* typ 16+1 bytes */ 290 struct thread *td_preempted; /* we preempted this thread */ 291 struct ucred *td_ucred; /* synchronized from p_ucred */ 292 void *td_unused04; /* for future fields */ 293 lwkt_tokref_t td_toks_have; /* tokens we own */ 294 lwkt_tokref_t td_toks_stop; /* tokens we want */ 295 struct lwkt_tokref td_toks_array[LWKT_MAXTOKENS]; 296 int td_fairq_load; /* fairq */ 297 int td_fairq_count; /* fairq */ 298 struct globaldata *td_migrate_gd; /* target gd for thread migration */ 299 #ifdef DEBUG_CRIT_SECTIONS 300 #define CRIT_DEBUG_ARRAY_SIZE 32 301 #define CRIT_DEBUG_ARRAY_MASK (CRIT_DEBUG_ARRAY_SIZE - 1) 302 const char *td_crit_debug_array[CRIT_DEBUG_ARRAY_SIZE]; 303 int td_crit_debug_index; 304 int td_in_crit_report; 305 #endif 306 struct md_thread td_mach; 307 #ifdef DEBUG_LOCKS 308 #define SPINLOCK_DEBUG_ARRAY_SIZE 32 309 int td_spinlock_stack_id[SPINLOCK_DEBUG_ARRAY_SIZE]; 310 struct spinlock *td_spinlock_stack[SPINLOCK_DEBUG_ARRAY_SIZE]; 311 void *td_spinlock_caller_pc[SPINLOCK_DEBUG_ARRAY_SIZE]; 312 313 /* 314 * Track lockmgr locks held; lk->lk_filename:lk->lk_lineno is the holder 315 */ 316 #define LOCKMGR_DEBUG_ARRAY_SIZE 8 317 int td_lockmgr_stack_id[LOCKMGR_DEBUG_ARRAY_SIZE]; 318 struct lock *td_lockmgr_stack[LOCKMGR_DEBUG_ARRAY_SIZE]; 319 #endif 320 }; 321 322 #define td_toks_base td_toks_array[0] 323 #define td_toks_end td_toks_array[LWKT_MAXTOKENS] 324 325 #define TD_TOKS_HELD(td) ((td)->td_toks_stop != &(td)->td_toks_base) 326 #define TD_TOKS_NOT_HELD(td) ((td)->td_toks_stop == &(td)->td_toks_base) 327 328 /* 329 * Thread flags. Note that TDF_RUNNING is cleared on the old thread after 330 * we switch to the new one, which is necessary because LWKTs don't need 331 * to hold the BGL. This flag is used by the exit code and the managed 332 * thread migration code. Note in addition that preemption will cause 333 * TDF_RUNNING to be cleared temporarily, so any code checking TDF_RUNNING 334 * must also check TDF_PREEMPT_LOCK. 335 * 336 * LWKT threads stay on their (per-cpu) run queue while running, not to 337 * be confused with user processes which are removed from the user scheduling 338 * run queue while actually running. 339 * 340 * td_threadq can represent the thread on one of three queues... the LWKT 341 * run queue, a tsleep queue, or an lwkt blocking queue. The LWKT subsystem 342 * does not allow a thread to be scheduled if it already resides on some 343 * queue. 344 */ 345 #define TDF_RUNNING 0x00000001 /* thread still active */ 346 #define TDF_RUNQ 0x00000002 /* on an LWKT run queue */ 347 #define TDF_PREEMPT_LOCK 0x00000004 /* I have been preempted */ 348 #define TDF_PREEMPT_DONE 0x00000008 /* ac preemption complete */ 349 #define TDF_NOSTART 0x00000010 /* do not schedule on create */ 350 #define TDF_MIGRATING 0x00000020 /* thread is being migrated */ 351 #define TDF_SINTR 0x00000040 /* interruptability for 'ps' */ 352 #define TDF_TSLEEPQ 0x00000080 /* on a tsleep wait queue */ 353 354 #define TDF_SYSTHREAD 0x00000100 /* reserve memory may be used */ 355 #define TDF_ALLOCATED_THREAD 0x00000200 /* objcache allocated thread */ 356 #define TDF_ALLOCATED_STACK 0x00000400 /* objcache allocated stack */ 357 #define TDF_VERBOSE 0x00000800 /* verbose on exit */ 358 #define TDF_DEADLKTREAT 0x00001000 /* special lockmgr treatment */ 359 #define TDF_MARKER 0x00002000 /* tdallq list scan marker */ 360 #define TDF_TIMEOUT_RUNNING 0x00004000 /* tsleep timeout race */ 361 #define TDF_TIMEOUT 0x00008000 /* tsleep timeout */ 362 #define TDF_INTTHREAD 0x00010000 /* interrupt thread */ 363 #define TDF_TSLEEP_DESCHEDULED 0x00020000 /* tsleep core deschedule */ 364 #define TDF_BLOCKED 0x00040000 /* Thread is blocked */ 365 #define TDF_PANICWARN 0x00080000 /* panic warning in switch */ 366 #define TDF_BLOCKQ 0x00100000 /* on block queue */ 367 #define TDF_FORCE_SPINPORT 0x00200000 368 #define TDF_EXITING 0x00400000 /* thread exiting */ 369 #define TDF_USINGFP 0x00800000 /* thread using fp coproc */ 370 #define TDF_KERNELFP 0x01000000 /* kernel using fp coproc */ 371 #define TDF_DELAYED_WAKEUP 0x02000000 372 #define TDF_UNUSED1 0x04000000 /* unused */ 373 #define TDF_USERMODE 0x08000000 /* in or entering user mode */ 374 #define TDF_NOFAULT 0x10000000 /* force onfault on fault */ 375 376 #define TDF_MP_STOPREQ 0x00000001 /* suspend_kproc */ 377 #define TDF_MP_WAKEREQ 0x00000002 /* resume_kproc */ 378 #define TDF_MP_EXITWAIT 0x00000004 /* reaper, see lwp_wait() */ 379 #define TDF_MP_EXITSIG 0x00000008 /* reaper, see lwp_wait() */ 380 #define TDF_MP_BATCH_DEMARC 0x00000010 /* batch mode handling */ 381 382 #define TD_TYPE_GENERIC 0 /* generic thread */ 383 #define TD_TYPE_CRYPTO 1 /* crypto thread */ 384 #define TD_TYPE_NETISR 2 /* netisr thread */ 385 386 /* 387 * Thread priorities. Typically only one thread from any given 388 * user process scheduling queue is on the LWKT run queue at a time. 389 * Remember that there is one LWKT run queue per cpu. 390 * 391 * Critical sections are handled by bumping td_pri above TDPRI_MAX, which 392 * causes interrupts to be masked as they occur. When this occurs a 393 * rollup flag will be set in mycpu->gd_reqflags. 394 */ 395 #define TDPRI_IDLE_THREAD 0 /* the idle thread */ 396 #define TDPRI_IDLE_WORK 1 /* idle work (page zero, etc) */ 397 #define TDPRI_USER_SCHEDULER 2 /* user scheduler helper */ 398 #define TDPRI_USER_IDLE 4 /* user scheduler idle */ 399 #define TDPRI_USER_NORM 6 /* user scheduler normal */ 400 #define TDPRI_USER_REAL 8 /* user scheduler real time */ 401 #define TDPRI_KERN_LPSCHED 9 /* scheduler helper for userland sch */ 402 #define TDPRI_KERN_USER 10 /* kernel / block in syscall */ 403 #define TDPRI_KERN_DAEMON 12 /* kernel daemon (pageout, etc) */ 404 #define TDPRI_SOFT_NORM 14 /* kernel / normal */ 405 #define TDPRI_SOFT_TIMER 16 /* kernel / timer */ 406 #define TDPRI_EXITING 19 /* exiting thread */ 407 #define TDPRI_INT_SUPPORT 20 /* kernel / high priority support */ 408 #define TDPRI_INT_LOW 27 /* low priority interrupt */ 409 #define TDPRI_INT_MED 28 /* medium priority interrupt */ 410 #define TDPRI_INT_HIGH 29 /* high priority interrupt */ 411 #define TDPRI_MAX 31 412 413 #define LWKT_THREAD_STACK (UPAGES * PAGE_SIZE) 414 415 #define IN_CRITICAL_SECT(td) ((td)->td_critcount) 416 417 #ifdef _KERNEL 418 419 /* 420 * Global tokens 421 */ 422 extern struct lwkt_token mp_token; 423 extern struct lwkt_token pmap_token; 424 extern struct lwkt_token dev_token; 425 extern struct lwkt_token vm_token; 426 extern struct lwkt_token vmspace_token; 427 extern struct lwkt_token kvm_token; 428 extern struct lwkt_token proc_token; 429 extern struct lwkt_token tty_token; 430 extern struct lwkt_token vnode_token; 431 extern struct lwkt_token vmobj_token; 432 433 /* 434 * Procedures 435 */ 436 extern void lwkt_init(void); 437 extern struct thread *lwkt_alloc_thread(struct thread *, int, int, int); 438 extern void lwkt_init_thread(struct thread *, void *, int, int, 439 struct globaldata *); 440 extern void lwkt_set_interrupt_support_thread(void); 441 extern void lwkt_set_comm(thread_t, const char *, ...) __printflike(2, 3); 442 extern void lwkt_free_thread(struct thread *); 443 extern void lwkt_gdinit(struct globaldata *); 444 extern void lwkt_switch(void); 445 extern void lwkt_switch_return(struct thread *); 446 extern void lwkt_preempt(thread_t, int); 447 extern void lwkt_schedule(thread_t); 448 extern void lwkt_schedule_noresched(thread_t); 449 extern void lwkt_schedule_self(thread_t); 450 extern void lwkt_deschedule(thread_t); 451 extern void lwkt_deschedule_self(thread_t); 452 extern void lwkt_yield(void); 453 extern void lwkt_yield_quick(void); 454 extern void lwkt_user_yield(void); 455 extern void lwkt_token_wait(void); 456 extern void lwkt_hold(thread_t); 457 extern void lwkt_rele(thread_t); 458 extern void lwkt_passive_release(thread_t); 459 extern void lwkt_maybe_splz(thread_t); 460 461 extern void lwkt_gettoken(lwkt_token_t); 462 extern void lwkt_gettoken_shared(lwkt_token_t); 463 extern void lwkt_gettoken_hard(lwkt_token_t); 464 extern int lwkt_trytoken(lwkt_token_t); 465 extern void lwkt_reltoken(lwkt_token_t); 466 extern void lwkt_reltoken_hard(lwkt_token_t); 467 extern int lwkt_cnttoken(lwkt_token_t, thread_t); 468 extern int lwkt_getalltokens(thread_t, int); 469 extern void lwkt_relalltokens(thread_t); 470 extern void lwkt_drain_token_requests(void); 471 extern void lwkt_token_init(lwkt_token_t, const char *); 472 extern void lwkt_token_uninit(lwkt_token_t); 473 474 extern void lwkt_token_pool_init(void); 475 extern lwkt_token_t lwkt_token_pool_lookup(void *); 476 extern lwkt_token_t lwkt_getpooltoken(void *); 477 extern void lwkt_relpooltoken(void *); 478 479 extern void lwkt_token_swap(void); 480 481 extern void lwkt_setpri(thread_t, int); 482 extern void lwkt_setpri_initial(thread_t, int); 483 extern void lwkt_setpri_self(int); 484 extern void lwkt_schedulerclock(thread_t td); 485 extern void lwkt_setcpu_self(struct globaldata *); 486 extern void lwkt_migratecpu(int); 487 488 extern void lwkt_giveaway(struct thread *); 489 extern void lwkt_acquire(struct thread *); 490 extern int lwkt_send_ipiq3(struct globaldata *, ipifunc3_t, void *, int); 491 extern int lwkt_send_ipiq3_passive(struct globaldata *, ipifunc3_t, 492 void *, int); 493 extern int lwkt_send_ipiq3_nowait(struct globaldata *, ipifunc3_t, 494 void *, int); 495 extern int lwkt_send_ipiq3_bycpu(int, ipifunc3_t, void *, int); 496 extern int lwkt_send_ipiq3_mask(cpumask_t, ipifunc3_t, void *, int); 497 extern void lwkt_wait_ipiq(struct globaldata *, int); 498 extern int lwkt_seq_ipiq(struct globaldata *); 499 extern void lwkt_process_ipiq(void); 500 extern void lwkt_process_ipiq_frame(struct intrframe *); 501 extern void lwkt_smp_stopped(void); 502 extern void lwkt_synchronize_ipiqs(const char *); 503 504 /* lwkt_cpusync_init() - inline function in sys/thread2.h */ 505 extern void lwkt_cpusync_simple(cpumask_t, cpusync_func_t, void *); 506 extern void lwkt_cpusync_interlock(lwkt_cpusync_t); 507 extern void lwkt_cpusync_deinterlock(lwkt_cpusync_t); 508 509 extern void crit_panic(void) __dead2; 510 extern struct lwp *lwkt_preempted_proc(void); 511 512 extern int lwkt_create (void (*func)(void *), void *, struct thread **, 513 struct thread *, int, int, 514 const char *, ...) __printflike(7, 8); 515 extern void lwkt_exit (void) __dead2; 516 extern void lwkt_remove_tdallq (struct thread *); 517 518 #endif 519 520 #endif 521 522