kernel - MPSAFE work - add vmspace_token
[dragonfly.git] / sys / sys / thread.h
CommitLineData
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1/*
2 * SYS/THREAD.H
3 *
4 * Implements the architecture independant portion of the LWKT
5 * subsystem.
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6 *
7 * Types which must already be defined when this header is included by
8 * userland: struct md_thread
2df9fa87 9 *
cbb1e737 10 * $DragonFly: src/sys/sys/thread.h,v 1.97 2008/09/20 04:31:02 sephe Exp $
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11 */
12
13#ifndef _SYS_THREAD_H_
14#define _SYS_THREAD_H_
15
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16#ifndef _SYS_STDINT_H_
17#include <sys/stdint.h> /* __int types */
18#endif
19#ifndef _SYS_PARAM_H_
20#include <sys/param.h> /* MAXCOMLEN */
21#endif
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22#ifndef _SYS_QUEUE_H_
23#include <sys/queue.h> /* TAILQ_* macros */
24#endif
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25#ifndef _SYS_MSGPORT_H_
26#include <sys/msgport.h> /* lwkt_port */
27#endif
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28#ifndef _SYS_TIME_H_
29#include <sys/time.h> /* struct timeval */
30#endif
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31#ifndef _SYS_SPINLOCK_H_
32#include <sys/spinlock.h>
33#endif
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34#ifndef _SYS_IOSCHED_H_
35#include <sys/iosched.h>
36#endif
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37#ifndef _MACHINE_THREAD_H_
38#include <machine/thread.h>
39#endif
8a8d5d85 40
f1d1c3fa 41struct globaldata;
ef09c3ed 42struct lwp;
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43struct proc;
44struct thread;
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45struct lwkt_queue;
46struct lwkt_token;
41a01a4d 47struct lwkt_tokref;
96728c05 48struct lwkt_ipiq;
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49struct lwkt_cpu_msg;
50struct lwkt_cpu_port;
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51struct lwkt_msg;
52struct lwkt_port;
3b6b7bd1 53struct lwkt_cpusync;
4fd10eb6 54union sysunion;
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55
56typedef struct lwkt_queue *lwkt_queue_t;
57typedef struct lwkt_token *lwkt_token_t;
41a01a4d 58typedef struct lwkt_tokref *lwkt_tokref_t;
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59typedef struct lwkt_cpu_msg *lwkt_cpu_msg_t;
60typedef struct lwkt_cpu_port *lwkt_cpu_port_t;
96728c05 61typedef struct lwkt_ipiq *lwkt_ipiq_t;
3b6b7bd1 62typedef struct lwkt_cpusync *lwkt_cpusync_t;
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63typedef struct thread *thread_t;
64
65typedef TAILQ_HEAD(lwkt_queue, thread) lwkt_queue;
f1d1c3fa 66
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67/*
68 * Differentiation between kernel threads and user threads. Userland
69 * programs which want to access to kernel structures have to define
70 * _KERNEL_STRUCTURES. This is a kinda safety valve to prevent badly
71 * written user programs from getting an LWKT thread that is neither the
72 * kernel nor the user version.
73 */
74#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
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75#ifndef _MACHINE_THREAD_H_
76#include <machine/thread.h> /* md_thread */
77#endif
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78#ifndef _MACHINE_FRAME_H_
79#include <machine/frame.h>
80#endif
81#else
82struct intrframe;
ece04fd0 83#endif
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84
85/*
41a01a4d 86 * Tokens are used to serialize access to information. They are 'soft'
dd55d707 87 * serialization entities that only stay in effect while a thread is
41a01a4d 88 * running. If the thread blocks, other threads can run holding the same
dd55d707 89 * token(s). The tokens are reacquired when the original thread resumes.
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90 *
91 * A thread can depend on its serialization remaining intact through a
92 * preemption. An interrupt which attempts to use the same token as the
93 * thread being preempted will reschedule itself for non-preemptive
94 * operation, so the new token code is capable of interlocking against
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95 * interrupts as well as other cpus. This means that your token can only
96 * be (temporarily) lost if you *explicitly* block.
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97 *
98 * Tokens are managed through a helper reference structure, lwkt_tokref,
99 * which is typically declared on the caller's stack. Multiple tokref's
100 * may reference the same token.
f1d1c3fa 101 */
dd55d707 102
f1d1c3fa 103typedef struct lwkt_token {
c6fbe95a 104 struct lwkt_tokref *t_ref; /* Owning ref or NULL */
3b998fa9 105 intptr_t t_flags; /* MP lock required */
c9aa7a82 106 long t_collisions; /* Collision counter */
7eb611ef 107} lwkt_token;
dd55d707 108
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109#define LWKT_TOKEN_MPSAFE 0x0001
110
111/*
112 * Static initialization for a lwkt_token.
113 * UP - Not MPSAFE (full MP lock will also be acquired)
114 * MP - Is MPSAFE (only the token will be acquired)
115 */
c9aa7a82 116#define LWKT_TOKEN_UP_INITIALIZER \
c6fbe95a 117{ \
3b998fa9 118 .t_ref = NULL, \
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119 .t_flags = 0, \
120 .t_collisions = 0 \
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121}
122
c9aa7a82 123#define LWKT_TOKEN_MP_INITIALIZER \
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124{ \
125 .t_ref = NULL, \
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126 .t_flags = LWKT_TOKEN_MPSAFE, \
127 .t_collisions = 0 \
0ca9b5e1 128}
0ca9b5e1 129
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130#define ASSERT_LWKT_TOKEN_HELD(tok) \
131 KKASSERT((tok)->t_ref->tr_owner == curthread)
8ed305a4 132
3b998fa9 133struct lwkt_tokref {
41a01a4d 134 lwkt_token_t tr_tok; /* token in question */
c6fbe95a 135 struct thread *tr_owner; /* me */
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136 intptr_t tr_flags; /* copy of t_flags */
137};
41a01a4d 138
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139#define MAXCPUFIFO 16 /* power of 2 */
140#define MAXCPUFIFO_MASK (MAXCPUFIFO - 1)
3b998fa9 141#define LWKT_MAXTOKENS 32 /* max tokens beneficially held by thread */
96728c05 142
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143/*
144 * Always cast to ipifunc_t when registering an ipi. The actual ipi function
145 * is called with both the data and an interrupt frame, but the ipi function
146 * that is registered might only declare a data argument.
147 */
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148typedef void (*ipifunc1_t)(void *arg);
149typedef void (*ipifunc2_t)(void *arg, int arg2);
150typedef void (*ipifunc3_t)(void *arg, int arg2, struct intrframe *frame);
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151
152typedef struct lwkt_ipiq {
153 int ip_rindex; /* only written by target cpu */
166ec852 154 int ip_xindex; /* written by target, indicates completion */
96728c05 155 int ip_windex; /* only written by source cpu */
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156 ipifunc3_t ip_func[MAXCPUFIFO];
157 void *ip_arg1[MAXCPUFIFO];
158 int ip_arg2[MAXCPUFIFO];
4c9f5a7f 159 u_int ip_npoll; /* synchronization to avoid excess IPIs */
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160} lwkt_ipiq;
161
f1d1c3fa 162/*
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163 * CPU Synchronization structure. See lwkt_cpusync_start() and
164 * lwkt_cpusync_finish() for more information.
165 */
166typedef void (*cpusync_func_t)(lwkt_cpusync_t poll);
167typedef void (*cpusync_func2_t)(void *data);
168
169struct lwkt_cpusync {
170 cpusync_func_t cs_run_func; /* run (tandem w/ acquire) */
171 cpusync_func_t cs_fin1_func; /* fin1 (synchronized) */
172 cpusync_func2_t cs_fin2_func; /* fin2 (tandem w/ release) */
173 void *cs_data;
5c71a36a 174 int cs_maxcount;
3b6b7bd1 175 volatile int cs_count;
5c71a36a 176 cpumask_t cs_mask;
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177};
178
179/*
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180 * The standard message and queue structure used for communications between
181 * cpus. Messages are typically queued via a machine-specific non-linked
182 * FIFO matrix allowing any cpu to send a message to any other cpu without
183 * blocking.
184 */
185typedef struct lwkt_cpu_msg {
186 void (*cm_func)(lwkt_cpu_msg_t msg); /* primary dispatch function */
187 int cm_code; /* request code if applicable */
188 int cm_cpu; /* reply to cpu */
189 thread_t cm_originator; /* originating thread for wakeup */
190} lwkt_cpu_msg;
191
192/*
f1d1c3fa 193 * Thread structure. Note that ownership of a thread structure is special
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194 * cased and there is no 'token'. A thread is always owned by the cpu
195 * represented by td_gd, any manipulation of the thread by some other cpu
196 * must be done through cpu_*msg() functions. e.g. you could request
197 * ownership of a thread that way, or hand a thread off to another cpu.
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198 *
199 * NOTE: td_pri is bumped by TDPRI_CRIT when entering a critical section,
200 * but this does not effect how the thread is scheduled by LWKT.
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201 *
202 * NOTE: td_ucred is synchronized from the p_ucred on user->kernel syscall,
203 * trap, and AST/signal transitions to provide a stable ucred for
204 * (primarily) system calls. This field will be NULL for pure kernel
205 * threads.
f1d1c3fa 206 */
96728c05 207struct md_intr_info;
f6bf3af1 208struct caps_kinfo;
96728c05 209
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210struct thread {
211 TAILQ_ENTRY(thread) td_threadq;
73e4f7b9 212 TAILQ_ENTRY(thread) td_allq;
ae8e83e6 213 TAILQ_ENTRY(thread) td_sleepq;
ece04fd0 214 lwkt_port td_msgport; /* built-in message port for replies */
ef09c3ed 215 struct lwp *td_lwp; /* (optional) associated lwp */
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216 struct proc *td_proc; /* (optional) associated process */
217 struct pcb *td_pcb; /* points to pcb and top of kstack */
26a0694b 218 struct globaldata *td_gd; /* associated with this cpu */
ae8050a4 219 const char *td_wmesg; /* string name for blockage */
5decebc7 220 const volatile void *td_wchan; /* waiting on channel */
4b5f931b 221 int td_pri; /* 0-31, 31=highest priority (note 1) */
b8337f35 222 int td_flags; /* TDF flags */
da5fb9ef 223 int td_wdomain; /* domain for wchan address (typ 0) */
96728c05 224 void (*td_preemptable)(struct thread *td, int critpri);
a2a5ad0d 225 void (*td_release)(struct thread *td);
7e1d4bf4 226 char *td_kstack; /* kernel stack */
f470d0c8 227 int td_kstack_size; /* size of kernel stack */
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228 char *td_sp; /* kernel stack pointer for LWKT restore */
229 void (*td_switch)(struct thread *ntd);
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230 __uint64_t td_uticks; /* Statclock hits in user mode (uS) */
231 __uint64_t td_sticks; /* Statclock hits in system mode (uS) */
232 __uint64_t td_iticks; /* Statclock hits processing intr (uS) */
69d78e99 233 int td_locks; /* lockmgr lock debugging */
d666840a 234 int td_unused01;
8c72e3d5 235 void *td_dsched_priv1; /* priv data for I/O schedulers */
73e4f7b9 236 int td_refs; /* hold position in gd_tdallq / hold free */
46a3f46d 237 int td_nest_count; /* prevent splz nesting */
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238#ifdef SMP
239 int td_mpcount; /* MP lock held (count) */
0f7a3396 240 int td_cscount; /* cpu synchronization master */
8a8d5d85 241#else
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242 int td_mpcount_unused; /* filler so size matches */
243 int td_cscount_unused;
8a8d5d85 244#endif
79eae878 245 struct iosched_data td_iosdata; /* Dynamic I/O scheduling data */
41f3429e 246 struct timeval td_start; /* start time for a thread/process */
0cfcada1 247 char td_comm[MAXCOMLEN+1]; /* typ 16+1 bytes */
99df837e 248 struct thread *td_preempted; /* we preempted this thread */
d86a23e0 249 struct ucred *td_ucred; /* synchronized from p_ucred */
f6bf3af1 250 struct caps_kinfo *td_caps; /* list of client and server registrations */
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251 lwkt_tokref_t td_toks_stop;
252 struct lwkt_tokref td_toks_array[LWKT_MAXTOKENS];
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253#ifdef DEBUG_CRIT_SECTIONS
254#define CRIT_DEBUG_ARRAY_SIZE 32
255#define CRIT_DEBUG_ARRAY_MASK (CRIT_DEBUG_ARRAY_SIZE - 1)
256 const char *td_crit_debug_array[CRIT_DEBUG_ARRAY_SIZE];
257 int td_crit_debug_index;
258 int td_in_crit_report;
259#endif
85100692 260 struct md_thread td_mach;
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261};
262
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263#define td_toks_base td_toks_array[0]
264#define td_toks_end td_toks_array[LWKT_MAXTOKENS]
265
266#define TD_TOKS_HELD(td) ((td)->td_toks_stop != &(td)->td_toks_base)
267#define TD_TOKS_NOT_HELD(td) ((td)->td_toks_stop == &(td)->td_toks_base)
268
2df9fa87 269/*
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270 * Thread flags. Note that TDF_RUNNING is cleared on the old thread after
271 * we switch to the new one, which is necessary because LWKTs don't need
272 * to hold the BGL. This flag is used by the exit code and the managed
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273 * thread migration code. Note in addition that preemption will cause
274 * TDF_RUNNING to be cleared temporarily, so any code checking TDF_RUNNING
275 * must also check TDF_PREEMPT_LOCK.
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276 *
277 * LWKT threads stay on their (per-cpu) run queue while running, not to
278 * be confused with user processes which are removed from the user scheduling
279 * run queue while actually running.
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280 *
281 * td_threadq can represent the thread on one of three queues... the LWKT
282 * run queue, a tsleep queue, or an lwkt blocking queue. The LWKT subsystem
283 * does not allow a thread to be scheduled if it already resides on some
284 * queue.
8ad65e08 285 */
d9eea1a5 286#define TDF_RUNNING 0x0001 /* thread still active */
a2a5ad0d 287#define TDF_RUNQ 0x0002 /* on an LWKT run queue */
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288#define TDF_PREEMPT_LOCK 0x0004 /* I have been preempted */
289#define TDF_PREEMPT_DONE 0x0008 /* acknowledge preemption complete */
a2a5ad0d 290#define TDF_IDLE_NOHLT 0x0010 /* we need to spin */
5d21b981 291#define TDF_MIGRATING 0x0020 /* thread is being migrated */
d9d6cb99 292#define TDF_SINTR 0x0040 /* interruptability hint for 'ps' */
344ad853 293#define TDF_TSLEEPQ 0x0080 /* on a tsleep wait queue */
26a0694b 294
4ecf7cc9 295#define TDF_SYSTHREAD 0x0100 /* allocations may use reserve */
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296#define TDF_ALLOCATED_THREAD 0x0200 /* objcache allocated thread */
297#define TDF_ALLOCATED_STACK 0x0400 /* objcache allocated stack */
99df837e 298#define TDF_VERBOSE 0x0800 /* verbose on exit */
dadab5e9 299#define TDF_DEADLKTREAT 0x1000 /* special lockmgr deadlock treatment */
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300#define TDF_STOPREQ 0x2000 /* suspend_kproc */
301#define TDF_WAKEREQ 0x4000 /* resume_kproc */
302#define TDF_TIMEOUT 0x8000 /* tsleep timeout */
03aa8d99 303#define TDF_INTTHREAD 0x00010000 /* interrupt thread */
ae8e83e6 304#define TDF_TSLEEP_DESCHEDULED 0x00020000 /* tsleep core deschedule */
8ec60c3f 305#define TDF_BLOCKED 0x00040000 /* Thread is blocked */
a7422615 306#define TDF_PANICWARN 0x00080000 /* panic warning in switch */
344ad853 307#define TDF_BLOCKQ 0x00100000 /* on block queue */
c2fba90b 308#define TDF_MPSAFE 0x00200000 /* (thread creation) */
c1102e9f 309#define TDF_EXITING 0x00400000 /* thread exiting */
1b251f0a 310#define TDF_USINGFP 0x00800000 /* thread using fp coproc */
aad81e48 311#define TDF_KERNELFP 0x01000000 /* kernel using fp coproc */
cbb1e737 312#define TDF_NETWORK 0x02000000 /* network proto thread */
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313
314/*
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315 * Thread priorities. Typically only one thread from any given
316 * user process scheduling queue is on the LWKT run queue at a time.
317 * Remember that there is one LWKT run queue per cpu.
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318 *
319 * Critical sections are handled by bumping td_pri above TDPRI_MAX, which
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320 * causes interrupts to be masked as they occur. When this occurs a
321 * rollup flag will be set in mycpu->gd_reqflags.
2df9fa87 322 */
f1d1c3fa 323#define TDPRI_IDLE_THREAD 0 /* the idle thread */
bb6811be 324#define TDPRI_IDLE_WORK 1 /* idle work (page zero, etc) */
50017724 325#define TDPRI_USER_SCHEDULER 2 /* user scheduler helper */
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326#define TDPRI_USER_IDLE 4 /* user scheduler idle */
327#define TDPRI_USER_NORM 6 /* user scheduler normal */
328#define TDPRI_USER_REAL 8 /* user scheduler real time */
9ae9ee8d 329#define TDPRI_KERN_LPSCHED 9 /* scheduler helper for userland sch */
f1d1c3fa 330#define TDPRI_KERN_USER 10 /* kernel / block in syscall */
26a0694b 331#define TDPRI_KERN_DAEMON 12 /* kernel daemon (pageout, etc) */
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332#define TDPRI_SOFT_NORM 14 /* kernel / normal */
333#define TDPRI_SOFT_TIMER 16 /* kernel / timer */
ae8050a4 334#define TDPRI_EXITING 19 /* exiting thread */
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335#define TDPRI_INT_SUPPORT 20 /* kernel / high priority support */
336#define TDPRI_INT_LOW 27 /* low priority interrupt */
337#define TDPRI_INT_MED 28 /* medium priority interrupt */
338#define TDPRI_INT_HIGH 29 /* high priority interrupt */
339#define TDPRI_MAX 31
340
341#define TDPRI_MASK 31
342#define TDPRI_CRIT 32 /* high bits of td_pri used for crit */
2df9fa87 343
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344#define LWKT_THREAD_STACK (UPAGES * PAGE_SIZE)
345
ef0fdad1 346#define CACHE_NTHREADS 6
7e1d4bf4 347
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348#define IN_CRITICAL_SECT(td) ((td)->td_pri >= TDPRI_CRIT)
349
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350#ifdef _KERNEL
351
352/*
353 * Global tokens
354 */
355extern struct lwkt_token pmap_token;
356extern struct lwkt_token dev_token;
d63ddd9c 357extern struct lwkt_token vm_token;
d39d3c43 358extern struct lwkt_token vmspace_token;
d63ddd9c 359extern struct lwkt_token kvm_token;
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360extern struct lwkt_token proc_token;
361extern struct lwkt_token tty_token;
362extern struct lwkt_token vnode_token;
363
364/*
365 * Procedures
366 */
40aaf5fc 367extern void lwkt_init(void);
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368extern struct thread *lwkt_alloc_thread(struct thread *, int, int, int);
369extern void lwkt_init_thread(struct thread *, void *, int, int,
370 struct globaldata *);
fcefa6f2 371extern void lwkt_set_comm(thread_t, const char *, ...) __printflike(2, 3);
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372extern void lwkt_wait_free(struct thread *);
373extern void lwkt_free_thread(struct thread *);
374extern void lwkt_gdinit(struct globaldata *);
8ad65e08 375extern void lwkt_switch(void);
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376extern void lwkt_preempt(thread_t, int);
377extern void lwkt_schedule(thread_t);
361d01dd 378extern void lwkt_schedule_noresched(thread_t);
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379extern void lwkt_schedule_self(thread_t);
380extern void lwkt_deschedule(thread_t);
381extern void lwkt_deschedule_self(thread_t);
f1d1c3fa 382extern void lwkt_yield(void);
3824f392 383extern void lwkt_user_yield(void);
41a01a4d 384extern void lwkt_token_wait(void);
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385extern void lwkt_hold(thread_t);
386extern void lwkt_rele(thread_t);
3824f392 387extern void lwkt_passive_release(thread_t);
b9665ad7 388
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389extern void lwkt_gettoken(lwkt_token_t);
390extern int lwkt_trytoken(lwkt_token_t);
391extern void lwkt_reltoken(lwkt_token_t);
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392extern int lwkt_getalltokens(thread_t);
393extern void lwkt_relalltokens(thread_t);
41a01a4d 394extern void lwkt_drain_token_requests(void);
3b998fa9 395extern void lwkt_token_init(lwkt_token_t, int);
b9665ad7 396extern void lwkt_token_uninit(lwkt_token_t);
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397
398extern void lwkt_token_pool_init(void);
c6fbe95a 399extern lwkt_token_t lwkt_token_pool_lookup(void *);
3b998fa9 400extern lwkt_token_t lwkt_getpooltoken(void *);
41a01a4d 401
b9665ad7 402extern void lwkt_setpri(thread_t, int);
03bd0a5e 403extern void lwkt_setpri_initial(thread_t, int);
b9665ad7 404extern void lwkt_setpri_self(int);
b9eb1c19 405extern int lwkt_check_resched(thread_t);
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406extern void lwkt_setcpu_self(struct globaldata *);
407extern void lwkt_migratecpu(int);
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408
409#ifdef SMP
410
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411extern void lwkt_giveaway(struct thread *);
412extern void lwkt_acquire(struct thread *);
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413extern int lwkt_send_ipiq3(struct globaldata *, ipifunc3_t, void *, int);
414extern int lwkt_send_ipiq3_passive(struct globaldata *, ipifunc3_t,
415 void *, int);
416extern int lwkt_send_ipiq3_nowait(struct globaldata *, ipifunc3_t,
417 void *, int);
418extern int lwkt_send_ipiq3_bycpu(int, ipifunc3_t, void *, int);
419extern int lwkt_send_ipiq3_mask(cpumask_t, ipifunc3_t, void *, int);
420extern void lwkt_wait_ipiq(struct globaldata *, int);
421extern int lwkt_seq_ipiq(struct globaldata *);
96728c05 422extern void lwkt_process_ipiq(void);
b9665ad7 423extern void lwkt_process_ipiq_frame(struct intrframe *);
b8a98473 424extern void lwkt_smp_stopped(void);
6c92c1f2 425extern void lwkt_synchronize_ipiqs(const char *);
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426
427#endif /* SMP */
428
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429extern void lwkt_cpusync_simple(cpumask_t, cpusync_func_t, void *);
430extern void lwkt_cpusync_fastdata(cpumask_t, cpusync_func2_t, void *);
431extern void lwkt_cpusync_start(cpumask_t, lwkt_cpusync_t);
432extern void lwkt_cpusync_add(cpumask_t, lwkt_cpusync_t);
433extern void lwkt_cpusync_finish(lwkt_cpusync_t);
b8a98473 434
26a0694b 435extern void crit_panic(void);
553ea3c8 436extern struct lwp *lwkt_preempted_proc(void);
4b5f931b 437
b9665ad7 438extern int lwkt_create (void (*func)(void *), void *, struct thread **,
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439 struct thread *, int, int,
440 const char *, ...) __printflike(7, 8);
b153f746 441extern void lwkt_exit (void) __dead2;
e56e4dea 442extern void lwkt_remove_tdallq (struct thread *);
99df837e 443
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444#endif
445
c9aa7a82
MD
446#endif
447