kernel - Major signal path adjustments to fix races, tsleep race fixes, +more
[dragonfly.git] / sys / sys / thread.h
CommitLineData
2df9fa87
MD
1/*
2 * SYS/THREAD.H
3 *
4 * Implements the architecture independant portion of the LWKT
5 * subsystem.
05220613
MD
6 *
7 * Types which must already be defined when this header is included by
8 * userland: struct md_thread
2df9fa87
MD
9 */
10
11#ifndef _SYS_THREAD_H_
12#define _SYS_THREAD_H_
13
05220613
MD
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
8a8d5d85
MD
20#ifndef _SYS_QUEUE_H_
21#include <sys/queue.h> /* TAILQ_* macros */
22#endif
05220613
MD
23#ifndef _SYS_MSGPORT_H_
24#include <sys/msgport.h> /* lwkt_port */
25#endif
41f3429e
HP
26#ifndef _SYS_TIME_H_
27#include <sys/time.h> /* struct timeval */
28#endif
67e75efb
VS
29#ifndef _SYS_LOCK_H
30#include <sys/lock.h>
31#endif
9d265729
MD
32#ifndef _SYS_SPINLOCK_H_
33#include <sys/spinlock.h>
34#endif
79eae878
MD
35#ifndef _SYS_IOSCHED_H_
36#include <sys/iosched.h>
37#endif
1bd40720 38#include <machine/thread.h>
8a8d5d85 39
f1d1c3fa 40struct globaldata;
ef09c3ed 41struct lwp;
2df9fa87
MD
42struct proc;
43struct thread;
f1d1c3fa
MD
44struct lwkt_queue;
45struct lwkt_token;
41a01a4d 46struct lwkt_tokref;
96728c05 47struct lwkt_ipiq;
f1d1c3fa
MD
48struct lwkt_cpu_msg;
49struct lwkt_cpu_port;
ece04fd0
MD
50struct lwkt_msg;
51struct lwkt_port;
3b6b7bd1 52struct lwkt_cpusync;
4fd10eb6 53union sysunion;
f1d1c3fa
MD
54
55typedef struct lwkt_queue *lwkt_queue_t;
56typedef struct lwkt_token *lwkt_token_t;
41a01a4d 57typedef struct lwkt_tokref *lwkt_tokref_t;
f1d1c3fa
MD
58typedef struct lwkt_cpu_msg *lwkt_cpu_msg_t;
59typedef struct lwkt_cpu_port *lwkt_cpu_port_t;
96728c05 60typedef struct lwkt_ipiq *lwkt_ipiq_t;
3b6b7bd1 61typedef struct lwkt_cpusync *lwkt_cpusync_t;
f1d1c3fa
MD
62typedef struct thread *thread_t;
63
64typedef TAILQ_HEAD(lwkt_queue, thread) lwkt_queue;
f1d1c3fa 65
05220613
MD
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)
85100692
MD
74#ifndef _MACHINE_THREAD_H_
75#include <machine/thread.h> /* md_thread */
76#endif
88c4d2f6
MD
77#ifndef _MACHINE_FRAME_H_
78#include <machine/frame.h>
79#endif
80#else
81struct intrframe;
ece04fd0 82#endif
f1d1c3fa
MD
83
84/*
41a01a4d 85 * Tokens are used to serialize access to information. They are 'soft'
dd55d707 86 * serialization entities that only stay in effect while a thread is
41a01a4d 87 * running. If the thread blocks, other threads can run holding the same
dd55d707 88 * token(s). The tokens are reacquired when the original thread resumes.
41a01a4d
MD
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
7eb611ef
MD
94 * interrupts as well as other cpus. This means that your token can only
95 * be (temporarily) lost if you *explicitly* block.
41a01a4d 96 *
544c38e8
NT
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.
54341a3b
MD
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.
f1d1c3fa 112 */
dd55d707 113
f1d1c3fa 114typedef struct lwkt_token {
54341a3b
MD
115 long t_count; /* Shared/exclreq/exclusive access */
116 struct lwkt_tokref *t_ref; /* Exclusive ref */
c9aa7a82 117 long t_collisions; /* Collision counter */
b37f18d6 118 const char *t_desc; /* Descriptive name */
7eb611ef 119} lwkt_token;
dd55d707 120
54341a3b
MD
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
3b998fa9
MD
126/*
127 * Static initialization for a lwkt_token.
3b998fa9 128 */
a3c18566 129#define LWKT_TOKEN_INITIALIZER(name) \
c6fbe95a 130{ \
54341a3b 131 .t_count = 0, \
3b998fa9 132 .t_ref = NULL, \
12586b82
MD
133 .t_collisions = 0, \
134 .t_desc = #name \
3b998fa9
MD
135}
136
4a28fe22
MD
137/*
138 * Assert that a particular token is held
139 */
b5d16701
MD
140#define LWKT_TOKEN_HELD(tok) _lwkt_token_held(tok, curthread)
141
4a28fe22 142#define ASSERT_LWKT_TOKEN_HELD(tok) \
b5d16701
MD
143 KKASSERT(LWKT_TOKEN_HELD(tok))
144
3933a3ab 145#define ASSERT_NO_TOKENS_HELD(td) \
b5d16701 146 KKASSERT((td)->td_toks_stop == &td->td_toks_array[0])
8ed305a4 147
4a28fe22
MD
148/*
149 * Assert that a particular token is held and we are in a hard
150 * code execution section (interrupt, ipi, or hard code section).
151 * Hard code sections are not allowed to block or potentially block.
152 * e.g. lwkt_gettoken() would only be ok if the token were already
153 * held.
154 */
155#define ASSERT_LWKT_TOKEN_HARD(tok) \
156 do { \
157 globaldata_t zgd __debugvar = mycpu; \
158 KKASSERT((tok)->t_ref && \
159 (tok)->t_ref->tr_owner == zgd->gd_curthread && \
160 zgd->gd_intr_nesting_level > 0); \
161 } while(0)
162
163/*
164 * Assert that a particular token is held and we are in a normal
165 * critical section. Critical sections will not be preempted but
166 * can explicitly block (tsleep, lwkt_gettoken, etc).
167 */
168#define ASSERT_LWKT_TOKEN_CRIT(tok) \
169 do { \
170 globaldata_t zgd __debugvar = mycpu; \
171 KKASSERT((tok)->t_ref && \
172 (tok)->t_ref->tr_owner == zgd->gd_curthread && \
173 zgd->gd_curthread->td_critcount > 0); \
174 } while(0)
175
3b998fa9 176struct lwkt_tokref {
41a01a4d 177 lwkt_token_t tr_tok; /* token in question */
54341a3b 178 long tr_count; /* TOK_EXCLUSIVE|TOK_EXCLREQ or 0 */
c6fbe95a 179 struct thread *tr_owner; /* me */
3b998fa9 180};
41a01a4d 181
b12defdc 182#define MAXCPUFIFO 32 /* power of 2 */
96728c05 183#define MAXCPUFIFO_MASK (MAXCPUFIFO - 1)
3b998fa9 184#define LWKT_MAXTOKENS 32 /* max tokens beneficially held by thread */
96728c05 185
88c4d2f6
MD
186/*
187 * Always cast to ipifunc_t when registering an ipi. The actual ipi function
188 * is called with both the data and an interrupt frame, but the ipi function
189 * that is registered might only declare a data argument.
190 */
b8a98473
MD
191typedef void (*ipifunc1_t)(void *arg);
192typedef void (*ipifunc2_t)(void *arg, int arg2);
193typedef void (*ipifunc3_t)(void *arg, int arg2, struct intrframe *frame);
96728c05
MD
194
195typedef struct lwkt_ipiq {
196 int ip_rindex; /* only written by target cpu */
166ec852 197 int ip_xindex; /* written by target, indicates completion */
96728c05 198 int ip_windex; /* only written by source cpu */
b12defdc
MD
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];
96728c05
MD
205} lwkt_ipiq;
206
f1d1c3fa 207/*
3b6b7bd1
MD
208 * CPU Synchronization structure. See lwkt_cpusync_start() and
209 * lwkt_cpusync_finish() for more information.
210 */
d5b2d319 211typedef void (*cpusync_func_t)(void *arg);
3b6b7bd1
MD
212
213struct lwkt_cpusync {
d5b2d319
MD
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 */
3b6b7bd1
MD
218};
219
220/*
f1d1c3fa
MD
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 */
226typedef 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/*
f1d1c3fa 234 * Thread structure. Note that ownership of a thread structure is special
a72187e9
MD
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.
4b5f931b 239 *
9910d07b
MD
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.
f1d1c3fa 244 */
96728c05 245struct md_intr_info;
f6bf3af1 246struct caps_kinfo;
96728c05 247
2df9fa87
MD
248struct thread {
249 TAILQ_ENTRY(thread) td_threadq;
73e4f7b9 250 TAILQ_ENTRY(thread) td_allq;
ae8e83e6 251 TAILQ_ENTRY(thread) td_sleepq;
ece04fd0 252 lwkt_port td_msgport; /* built-in message port for replies */
ef09c3ed 253 struct lwp *td_lwp; /* (optional) associated lwp */
2df9fa87
MD
254 struct proc *td_proc; /* (optional) associated process */
255 struct pcb *td_pcb; /* points to pcb and top of kstack */
26a0694b 256 struct globaldata *td_gd; /* associated with this cpu */
ae8050a4 257 const char *td_wmesg; /* string name for blockage */
5decebc7 258 const volatile void *td_wchan; /* waiting on channel */
4b5f931b 259 int td_pri; /* 0-31, 31=highest priority (note 1) */
f9235b6d 260 int td_critcount; /* critical section priority */
4643740a 261 u_int td_flags; /* TDF flags */
da5fb9ef 262 int td_wdomain; /* domain for wchan address (typ 0) */
f9235b6d 263 void (*td_preemptable)(struct thread *td, int critcount);
a2a5ad0d 264 void (*td_release)(struct thread *td);
7e1d4bf4 265 char *td_kstack; /* kernel stack */
f470d0c8 266 int td_kstack_size; /* size of kernel stack */
8ad65e08 267 char *td_sp; /* kernel stack pointer for LWKT restore */
cc9b6223 268 thread_t (*td_switch)(struct thread *ntd);
05220613
MD
269 __uint64_t td_uticks; /* Statclock hits in user mode (uS) */
270 __uint64_t td_sticks; /* Statclock hits in system mode (uS) */
271 __uint64_t td_iticks; /* Statclock hits processing intr (uS) */
69d78e99 272 int td_locks; /* lockmgr lock debugging */
8c72e3d5 273 void *td_dsched_priv1; /* priv data for I/O schedulers */
73e4f7b9 274 int td_refs; /* hold position in gd_tdallq / hold free */
46a3f46d 275 int td_nest_count; /* prevent splz nesting */
85946b6c 276 int td_contended; /* token contention count */
4643740a 277 u_int td_mpflags; /* flags can be set by foreign cpus */
8a8d5d85 278#ifdef SMP
0f7a3396 279 int td_cscount; /* cpu synchronization master */
8a8d5d85 280#else
386344f1 281 int td_cscount_unused;
8a8d5d85 282#endif
b5d16701
MD
283 int td_unused02[4]; /* for future fields */
284 int td_unused03[4]; /* for future fields */
79eae878 285 struct iosched_data td_iosdata; /* Dynamic I/O scheduling data */
41f3429e 286 struct timeval td_start; /* start time for a thread/process */
0cfcada1 287 char td_comm[MAXCOMLEN+1]; /* typ 16+1 bytes */
99df837e 288 struct thread *td_preempted; /* we preempted this thread */
d86a23e0 289 struct ucred *td_ucred; /* synchronized from p_ucred */
f6bf3af1 290 struct caps_kinfo *td_caps; /* list of client and server registrations */
54341a3b
MD
291 lwkt_tokref_t td_toks_have; /* tokens we own */
292 lwkt_tokref_t td_toks_stop; /* tokens we want */
3b998fa9 293 struct lwkt_tokref td_toks_array[LWKT_MAXTOKENS];
85946b6c
MD
294 int td_fairq_load; /* fairq */
295 int td_fairq_count; /* fairq */
cc9b6223 296 struct globaldata *td_migrate_gd; /* target gd for thread migration */
02d8a449
MD
297#ifdef DEBUG_CRIT_SECTIONS
298#define CRIT_DEBUG_ARRAY_SIZE 32
299#define CRIT_DEBUG_ARRAY_MASK (CRIT_DEBUG_ARRAY_SIZE - 1)
300 const char *td_crit_debug_array[CRIT_DEBUG_ARRAY_SIZE];
301 int td_crit_debug_index;
302 int td_in_crit_report;
303#endif
85100692 304 struct md_thread td_mach;
1a474e56
VS
305#ifdef DEBUG_LOCKS
306#define SPINLOCK_DEBUG_ARRAY_SIZE 32
307 int td_spinlock_stack_id[SPINLOCK_DEBUG_ARRAY_SIZE];
308 struct spinlock *td_spinlock_stack[SPINLOCK_DEBUG_ARRAY_SIZE];
309 void *td_spinlock_caller_pc[SPINLOCK_DEBUG_ARRAY_SIZE];
67e75efb
VS
310
311 /*
312 * Track lockmgr locks held; lk->lk_filename:lk->lk_lineno is the holder
313 */
314#define LOCKMGR_DEBUG_ARRAY_SIZE 8
315 int td_lockmgr_stack_id[LOCKMGR_DEBUG_ARRAY_SIZE];
316 struct lock *td_lockmgr_stack[LOCKMGR_DEBUG_ARRAY_SIZE];
1a474e56 317#endif
2df9fa87
MD
318};
319
3933a3ab
MD
320#define td_toks_base td_toks_array[0]
321#define td_toks_end td_toks_array[LWKT_MAXTOKENS]
3b998fa9
MD
322
323#define TD_TOKS_HELD(td) ((td)->td_toks_stop != &(td)->td_toks_base)
324#define TD_TOKS_NOT_HELD(td) ((td)->td_toks_stop == &(td)->td_toks_base)
325
2df9fa87 326/*
d9eea1a5
MD
327 * Thread flags. Note that TDF_RUNNING is cleared on the old thread after
328 * we switch to the new one, which is necessary because LWKTs don't need
329 * to hold the BGL. This flag is used by the exit code and the managed
c1102e9f
MD
330 * thread migration code. Note in addition that preemption will cause
331 * TDF_RUNNING to be cleared temporarily, so any code checking TDF_RUNNING
332 * must also check TDF_PREEMPT_LOCK.
a2a5ad0d
MD
333 *
334 * LWKT threads stay on their (per-cpu) run queue while running, not to
335 * be confused with user processes which are removed from the user scheduling
336 * run queue while actually running.
344ad853
MD
337 *
338 * td_threadq can represent the thread on one of three queues... the LWKT
339 * run queue, a tsleep queue, or an lwkt blocking queue. The LWKT subsystem
340 * does not allow a thread to be scheduled if it already resides on some
341 * queue.
8ad65e08 342 */
4643740a
MD
343#define TDF_RUNNING 0x00000001 /* thread still active */
344#define TDF_RUNQ 0x00000002 /* on an LWKT run queue */
345#define TDF_PREEMPT_LOCK 0x00000004 /* I have been preempted */
346#define TDF_PREEMPT_DONE 0x00000008 /* ac preemption complete */
347#define TDF_NOSTART 0x00000010 /* do not schedule on create */
348#define TDF_MIGRATING 0x00000020 /* thread is being migrated */
349#define TDF_SINTR 0x00000040 /* interruptability for 'ps' */
350#define TDF_TSLEEPQ 0x00000080 /* on a tsleep wait queue */
26a0694b 351
4643740a
MD
352#define TDF_SYSTHREAD 0x00000100 /* reserve memory may be used */
353#define TDF_ALLOCATED_THREAD 0x00000200 /* objcache allocated thread */
354#define TDF_ALLOCATED_STACK 0x00000400 /* objcache allocated stack */
355#define TDF_VERBOSE 0x00000800 /* verbose on exit */
356#define TDF_DEADLKTREAT 0x00001000 /* special lockmgr treatment */
357#define TDF_UNUSED2000 0x00002000
358#define TDF_TIMEOUT_RUNNING 0x00004000 /* tsleep timeout race */
359#define TDF_TIMEOUT 0x00008000 /* tsleep timeout */
03aa8d99 360#define TDF_INTTHREAD 0x00010000 /* interrupt thread */
ae8e83e6 361#define TDF_TSLEEP_DESCHEDULED 0x00020000 /* tsleep core deschedule */
8ec60c3f 362#define TDF_BLOCKED 0x00040000 /* Thread is blocked */
a7422615 363#define TDF_PANICWARN 0x00080000 /* panic warning in switch */
344ad853 364#define TDF_BLOCKQ 0x00100000 /* on block queue */
392cd266 365#define TDF_FORCE_SPINPORT 0x00200000
c1102e9f 366#define TDF_EXITING 0x00400000 /* thread exiting */
1b251f0a 367#define TDF_USINGFP 0x00800000 /* thread using fp coproc */
aad81e48 368#define TDF_KERNELFP 0x01000000 /* kernel using fp coproc */
c3c96e44 369#define TDF_UNUSED02000000 0x02000000
345ee1fb 370#define TDF_CRYPTO 0x04000000 /* crypto thread */
8ad65e08 371
4643740a
MD
372#define TDF_MP_STOPREQ 0x00000001 /* suspend_kproc */
373#define TDF_MP_WAKEREQ 0x00000002 /* resume_kproc */
374
8ad65e08 375/*
2df9fa87
MD
376 * Thread priorities. Typically only one thread from any given
377 * user process scheduling queue is on the LWKT run queue at a time.
378 * Remember that there is one LWKT run queue per cpu.
f1d1c3fa
MD
379 *
380 * Critical sections are handled by bumping td_pri above TDPRI_MAX, which
235957ed
MD
381 * causes interrupts to be masked as they occur. When this occurs a
382 * rollup flag will be set in mycpu->gd_reqflags.
2df9fa87 383 */
f1d1c3fa 384#define TDPRI_IDLE_THREAD 0 /* the idle thread */
bb6811be 385#define TDPRI_IDLE_WORK 1 /* idle work (page zero, etc) */
50017724 386#define TDPRI_USER_SCHEDULER 2 /* user scheduler helper */
f1d1c3fa
MD
387#define TDPRI_USER_IDLE 4 /* user scheduler idle */
388#define TDPRI_USER_NORM 6 /* user scheduler normal */
389#define TDPRI_USER_REAL 8 /* user scheduler real time */
9ae9ee8d 390#define TDPRI_KERN_LPSCHED 9 /* scheduler helper for userland sch */
f1d1c3fa 391#define TDPRI_KERN_USER 10 /* kernel / block in syscall */
26a0694b 392#define TDPRI_KERN_DAEMON 12 /* kernel daemon (pageout, etc) */
f1d1c3fa
MD
393#define TDPRI_SOFT_NORM 14 /* kernel / normal */
394#define TDPRI_SOFT_TIMER 16 /* kernel / timer */
ae8050a4 395#define TDPRI_EXITING 19 /* exiting thread */
f1d1c3fa
MD
396#define TDPRI_INT_SUPPORT 20 /* kernel / high priority support */
397#define TDPRI_INT_LOW 27 /* low priority interrupt */
398#define TDPRI_INT_MED 28 /* medium priority interrupt */
399#define TDPRI_INT_HIGH 29 /* high priority interrupt */
400#define TDPRI_MAX 31
401
f470d0c8
MD
402#define LWKT_THREAD_STACK (UPAGES * PAGE_SIZE)
403
f9235b6d 404#define IN_CRITICAL_SECT(td) ((td)->td_critcount)
f8c3996b 405
c9aa7a82
MD
406#ifdef _KERNEL
407
408/*
409 * Global tokens
410 */
b5d16701 411extern struct lwkt_token mp_token;
c9aa7a82
MD
412extern struct lwkt_token pmap_token;
413extern struct lwkt_token dev_token;
d63ddd9c 414extern struct lwkt_token vm_token;
d39d3c43 415extern struct lwkt_token vmspace_token;
d63ddd9c 416extern struct lwkt_token kvm_token;
c9aa7a82
MD
417extern struct lwkt_token proc_token;
418extern struct lwkt_token tty_token;
419extern struct lwkt_token vnode_token;
2de4f77e 420extern struct lwkt_token vmobj_token;
c9aa7a82
MD
421
422/*
423 * Procedures
424 */
40aaf5fc 425extern void lwkt_init(void);
b9665ad7
SW
426extern struct thread *lwkt_alloc_thread(struct thread *, int, int, int);
427extern void lwkt_init_thread(struct thread *, void *, int, int,
428 struct globaldata *);
e6546af9 429extern void lwkt_set_interrupt_support_thread(void);
fcefa6f2 430extern void lwkt_set_comm(thread_t, const char *, ...) __printflike(2, 3);
b9665ad7
SW
431extern void lwkt_wait_free(struct thread *);
432extern void lwkt_free_thread(struct thread *);
433extern void lwkt_gdinit(struct globaldata *);
8ad65e08 434extern void lwkt_switch(void);
cc9b6223 435extern void lwkt_switch_return(struct thread *);
b9665ad7
SW
436extern void lwkt_preempt(thread_t, int);
437extern void lwkt_schedule(thread_t);
361d01dd 438extern void lwkt_schedule_noresched(thread_t);
b9665ad7
SW
439extern void lwkt_schedule_self(thread_t);
440extern void lwkt_deschedule(thread_t);
441extern void lwkt_deschedule_self(thread_t);
f1d1c3fa 442extern void lwkt_yield(void);
3824f392 443extern void lwkt_user_yield(void);
41a01a4d 444extern void lwkt_token_wait(void);
b9665ad7
SW
445extern void lwkt_hold(thread_t);
446extern void lwkt_rele(thread_t);
3824f392 447extern void lwkt_passive_release(thread_t);
4a28fe22 448extern void lwkt_maybe_splz(thread_t);
b9665ad7 449
3b998fa9 450extern void lwkt_gettoken(lwkt_token_t);
54341a3b 451extern void lwkt_gettoken_shared(lwkt_token_t);
4a28fe22 452extern void lwkt_gettoken_hard(lwkt_token_t);
3b998fa9
MD
453extern int lwkt_trytoken(lwkt_token_t);
454extern void lwkt_reltoken(lwkt_token_t);
4a28fe22 455extern void lwkt_reltoken_hard(lwkt_token_t);
b5d16701 456extern int lwkt_cnttoken(lwkt_token_t, thread_t);
b12defdc 457extern int lwkt_getalltokens(thread_t, int);
b9665ad7 458extern void lwkt_relalltokens(thread_t);
41a01a4d 459extern void lwkt_drain_token_requests(void);
a3c18566 460extern void lwkt_token_init(lwkt_token_t, const char *);
b9665ad7 461extern void lwkt_token_uninit(lwkt_token_t);
41a01a4d
MD
462
463extern void lwkt_token_pool_init(void);
c6fbe95a 464extern lwkt_token_t lwkt_token_pool_lookup(void *);
3b998fa9 465extern lwkt_token_t lwkt_getpooltoken(void *);
177e553a 466extern void lwkt_relpooltoken(void *);
41a01a4d 467
d79f0a1a
VS
468extern void lwkt_token_swap(void);
469
b9665ad7 470extern void lwkt_setpri(thread_t, int);
03bd0a5e 471extern void lwkt_setpri_initial(thread_t, int);
b9665ad7 472extern void lwkt_setpri_self(int);
85946b6c 473extern void lwkt_schedulerclock(thread_t td);
b9665ad7
SW
474extern void lwkt_setcpu_self(struct globaldata *);
475extern void lwkt_migratecpu(int);
b8a98473
MD
476
477#ifdef SMP
478
52eedfb5
MD
479extern void lwkt_giveaway(struct thread *);
480extern void lwkt_acquire(struct thread *);
b9665ad7
SW
481extern int lwkt_send_ipiq3(struct globaldata *, ipifunc3_t, void *, int);
482extern int lwkt_send_ipiq3_passive(struct globaldata *, ipifunc3_t,
483 void *, int);
484extern int lwkt_send_ipiq3_nowait(struct globaldata *, ipifunc3_t,
485 void *, int);
486extern int lwkt_send_ipiq3_bycpu(int, ipifunc3_t, void *, int);
487extern int lwkt_send_ipiq3_mask(cpumask_t, ipifunc3_t, void *, int);
488extern void lwkt_wait_ipiq(struct globaldata *, int);
489extern int lwkt_seq_ipiq(struct globaldata *);
96728c05 490extern void lwkt_process_ipiq(void);
b9665ad7 491extern void lwkt_process_ipiq_frame(struct intrframe *);
b8a98473 492extern void lwkt_smp_stopped(void);
6c92c1f2 493extern void lwkt_synchronize_ipiqs(const char *);
b8a98473
MD
494
495#endif /* SMP */
496
d5b2d319 497/* lwkt_cpusync_init() - inline function in sys/thread2.h */
b9665ad7 498extern void lwkt_cpusync_simple(cpumask_t, cpusync_func_t, void *);
d5b2d319
MD
499extern void lwkt_cpusync_interlock(lwkt_cpusync_t);
500extern void lwkt_cpusync_deinterlock(lwkt_cpusync_t);
b8a98473 501
4a28fe22 502extern void crit_panic(void) __dead2;
553ea3c8 503extern struct lwp *lwkt_preempted_proc(void);
4b5f931b 504
b9665ad7 505extern int lwkt_create (void (*func)(void *), void *, struct thread **,
fcefa6f2
SW
506 struct thread *, int, int,
507 const char *, ...) __printflike(7, 8);
b153f746 508extern void lwkt_exit (void) __dead2;
e56e4dea 509extern void lwkt_remove_tdallq (struct thread *);
99df837e 510
2df9fa87
MD
511#endif
512
c9aa7a82
MD
513#endif
514