kernel - Add description to static token initializers
[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.
41a01a4d 97 *
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98 * Tokens are managed through a helper reference structure, lwkt_tokref. Each
99 * thread has a stack of tokref's to keep track of acquired tokens. Multiple
100 * tokref's 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 */
b37f18d6 107 const char *t_desc; /* Descriptive name */
7eb611ef 108} lwkt_token;
dd55d707 109
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110#define LWKT_TOKEN_MPSAFE 0x0001
111
112/*
113 * Static initialization for a lwkt_token.
114 * UP - Not MPSAFE (full MP lock will also be acquired)
115 * MP - Is MPSAFE (only the token will be acquired)
116 */
12586b82 117#define LWKT_TOKEN_UP_INITIALIZER(name) \
c6fbe95a 118{ \
3b998fa9 119 .t_ref = NULL, \
c9aa7a82 120 .t_flags = 0, \
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121 .t_collisions = 0, \
122 .t_desc = #name \
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123}
124
12586b82 125#define LWKT_TOKEN_MP_INITIALIZER(name) \
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126{ \
127 .t_ref = NULL, \
c9aa7a82 128 .t_flags = LWKT_TOKEN_MPSAFE, \
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129 .t_collisions = 0, \
130 .t_desc = #name \
0ca9b5e1 131}
0ca9b5e1 132
c6fbe95a 133#define ASSERT_LWKT_TOKEN_HELD(tok) \
bd92ea59 134 KKASSERT((tok)->t_ref && (tok)->t_ref->tr_owner == curthread)
8ed305a4 135
3b998fa9 136struct lwkt_tokref {
41a01a4d 137 lwkt_token_t tr_tok; /* token in question */
c6fbe95a 138 struct thread *tr_owner; /* me */
3b998fa9 139 intptr_t tr_flags; /* copy of t_flags */
b37f18d6 140 const void *tr_stallpc; /* stalled at pc */
3b998fa9 141};
41a01a4d 142
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143#define MAXCPUFIFO 16 /* power of 2 */
144#define MAXCPUFIFO_MASK (MAXCPUFIFO - 1)
3b998fa9 145#define LWKT_MAXTOKENS 32 /* max tokens beneficially held by thread */
96728c05 146
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147/*
148 * Always cast to ipifunc_t when registering an ipi. The actual ipi function
149 * is called with both the data and an interrupt frame, but the ipi function
150 * that is registered might only declare a data argument.
151 */
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152typedef void (*ipifunc1_t)(void *arg);
153typedef void (*ipifunc2_t)(void *arg, int arg2);
154typedef void (*ipifunc3_t)(void *arg, int arg2, struct intrframe *frame);
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155
156typedef struct lwkt_ipiq {
157 int ip_rindex; /* only written by target cpu */
166ec852 158 int ip_xindex; /* written by target, indicates completion */
96728c05 159 int ip_windex; /* only written by source cpu */
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160 ipifunc3_t ip_func[MAXCPUFIFO];
161 void *ip_arg1[MAXCPUFIFO];
162 int ip_arg2[MAXCPUFIFO];
4c9f5a7f 163 u_int ip_npoll; /* synchronization to avoid excess IPIs */
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164} lwkt_ipiq;
165
f1d1c3fa 166/*
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167 * CPU Synchronization structure. See lwkt_cpusync_start() and
168 * lwkt_cpusync_finish() for more information.
169 */
170typedef void (*cpusync_func_t)(lwkt_cpusync_t poll);
171typedef void (*cpusync_func2_t)(void *data);
172
173struct lwkt_cpusync {
174 cpusync_func_t cs_run_func; /* run (tandem w/ acquire) */
175 cpusync_func_t cs_fin1_func; /* fin1 (synchronized) */
176 cpusync_func2_t cs_fin2_func; /* fin2 (tandem w/ release) */
177 void *cs_data;
5c71a36a 178 int cs_maxcount;
3b6b7bd1 179 volatile int cs_count;
5c71a36a 180 cpumask_t cs_mask;
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181};
182
183/*
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184 * The standard message and queue structure used for communications between
185 * cpus. Messages are typically queued via a machine-specific non-linked
186 * FIFO matrix allowing any cpu to send a message to any other cpu without
187 * blocking.
188 */
189typedef struct lwkt_cpu_msg {
190 void (*cm_func)(lwkt_cpu_msg_t msg); /* primary dispatch function */
191 int cm_code; /* request code if applicable */
192 int cm_cpu; /* reply to cpu */
193 thread_t cm_originator; /* originating thread for wakeup */
194} lwkt_cpu_msg;
195
196/*
f1d1c3fa 197 * Thread structure. Note that ownership of a thread structure is special
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198 * cased and there is no 'token'. A thread is always owned by the cpu
199 * represented by td_gd, any manipulation of the thread by some other cpu
200 * must be done through cpu_*msg() functions. e.g. you could request
201 * ownership of a thread that way, or hand a thread off to another cpu.
4b5f931b 202 *
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203 * NOTE: td_ucred is synchronized from the p_ucred on user->kernel syscall,
204 * trap, and AST/signal transitions to provide a stable ucred for
205 * (primarily) system calls. This field will be NULL for pure kernel
206 * threads.
f1d1c3fa 207 */
96728c05 208struct md_intr_info;
f6bf3af1 209struct caps_kinfo;
96728c05 210
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211struct thread {
212 TAILQ_ENTRY(thread) td_threadq;
73e4f7b9 213 TAILQ_ENTRY(thread) td_allq;
ae8e83e6 214 TAILQ_ENTRY(thread) td_sleepq;
ece04fd0 215 lwkt_port td_msgport; /* built-in message port for replies */
ef09c3ed 216 struct lwp *td_lwp; /* (optional) associated lwp */
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217 struct proc *td_proc; /* (optional) associated process */
218 struct pcb *td_pcb; /* points to pcb and top of kstack */
26a0694b 219 struct globaldata *td_gd; /* associated with this cpu */
ae8050a4 220 const char *td_wmesg; /* string name for blockage */
5decebc7 221 const volatile void *td_wchan; /* waiting on channel */
4b5f931b 222 int td_pri; /* 0-31, 31=highest priority (note 1) */
f9235b6d 223 int td_critcount; /* critical section priority */
b8337f35 224 int td_flags; /* TDF flags */
da5fb9ef 225 int td_wdomain; /* domain for wchan address (typ 0) */
f9235b6d 226 void (*td_preemptable)(struct thread *td, int critcount);
a2a5ad0d 227 void (*td_release)(struct thread *td);
7e1d4bf4 228 char *td_kstack; /* kernel stack */
f470d0c8 229 int td_kstack_size; /* size of kernel stack */
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230 char *td_sp; /* kernel stack pointer for LWKT restore */
231 void (*td_switch)(struct thread *ntd);
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232 __uint64_t td_uticks; /* Statclock hits in user mode (uS) */
233 __uint64_t td_sticks; /* Statclock hits in system mode (uS) */
234 __uint64_t td_iticks; /* Statclock hits processing intr (uS) */
69d78e99 235 int td_locks; /* lockmgr lock debugging */
8c72e3d5 236 void *td_dsched_priv1; /* priv data for I/O schedulers */
73e4f7b9 237 int td_refs; /* hold position in gd_tdallq / hold free */
46a3f46d 238 int td_nest_count; /* prevent splz nesting */
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239#ifdef SMP
240 int td_mpcount; /* MP lock held (count) */
0f7a3396 241 int td_cscount; /* cpu synchronization master */
8a8d5d85 242#else
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243 int td_mpcount_unused; /* filler so size matches */
244 int td_cscount_unused;
8a8d5d85 245#endif
79eae878 246 struct iosched_data td_iosdata; /* Dynamic I/O scheduling data */
41f3429e 247 struct timeval td_start; /* start time for a thread/process */
0cfcada1 248 char td_comm[MAXCOMLEN+1]; /* typ 16+1 bytes */
99df837e 249 struct thread *td_preempted; /* we preempted this thread */
d86a23e0 250 struct ucred *td_ucred; /* synchronized from p_ucred */
f6bf3af1 251 struct caps_kinfo *td_caps; /* list of client and server registrations */
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252 lwkt_tokref_t td_toks_stop;
253 struct lwkt_tokref td_toks_array[LWKT_MAXTOKENS];
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254 int td_fairq_lticks; /* fairq wakeup accumulator reset */
255 int td_fairq_accum; /* fairq priority accumulator */
256 const void *td_mplock_stallpc; /* last mplock stall address */
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257#ifdef DEBUG_CRIT_SECTIONS
258#define CRIT_DEBUG_ARRAY_SIZE 32
259#define CRIT_DEBUG_ARRAY_MASK (CRIT_DEBUG_ARRAY_SIZE - 1)
260 const char *td_crit_debug_array[CRIT_DEBUG_ARRAY_SIZE];
261 int td_crit_debug_index;
262 int td_in_crit_report;
263#endif
85100692 264 struct md_thread td_mach;
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265};
266
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267#define td_toks_base td_toks_array[0]
268#define td_toks_end td_toks_array[LWKT_MAXTOKENS]
269
270#define TD_TOKS_HELD(td) ((td)->td_toks_stop != &(td)->td_toks_base)
271#define TD_TOKS_NOT_HELD(td) ((td)->td_toks_stop == &(td)->td_toks_base)
272
2df9fa87 273/*
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274 * Thread flags. Note that TDF_RUNNING is cleared on the old thread after
275 * we switch to the new one, which is necessary because LWKTs don't need
276 * to hold the BGL. This flag is used by the exit code and the managed
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277 * thread migration code. Note in addition that preemption will cause
278 * TDF_RUNNING to be cleared temporarily, so any code checking TDF_RUNNING
279 * must also check TDF_PREEMPT_LOCK.
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280 *
281 * LWKT threads stay on their (per-cpu) run queue while running, not to
282 * be confused with user processes which are removed from the user scheduling
283 * run queue while actually running.
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284 *
285 * td_threadq can represent the thread on one of three queues... the LWKT
286 * run queue, a tsleep queue, or an lwkt blocking queue. The LWKT subsystem
287 * does not allow a thread to be scheduled if it already resides on some
288 * queue.
8ad65e08 289 */
d9eea1a5 290#define TDF_RUNNING 0x0001 /* thread still active */
a2a5ad0d 291#define TDF_RUNQ 0x0002 /* on an LWKT run queue */
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292#define TDF_PREEMPT_LOCK 0x0004 /* I have been preempted */
293#define TDF_PREEMPT_DONE 0x0008 /* acknowledge preemption complete */
a2a5ad0d 294#define TDF_IDLE_NOHLT 0x0010 /* we need to spin */
5d21b981 295#define TDF_MIGRATING 0x0020 /* thread is being migrated */
d9d6cb99 296#define TDF_SINTR 0x0040 /* interruptability hint for 'ps' */
344ad853 297#define TDF_TSLEEPQ 0x0080 /* on a tsleep wait queue */
26a0694b 298
4ecf7cc9 299#define TDF_SYSTHREAD 0x0100 /* allocations may use reserve */
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300#define TDF_ALLOCATED_THREAD 0x0200 /* objcache allocated thread */
301#define TDF_ALLOCATED_STACK 0x0400 /* objcache allocated stack */
99df837e 302#define TDF_VERBOSE 0x0800 /* verbose on exit */
dadab5e9 303#define TDF_DEADLKTREAT 0x1000 /* special lockmgr deadlock treatment */
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304#define TDF_STOPREQ 0x2000 /* suspend_kproc */
305#define TDF_WAKEREQ 0x4000 /* resume_kproc */
306#define TDF_TIMEOUT 0x8000 /* tsleep timeout */
03aa8d99 307#define TDF_INTTHREAD 0x00010000 /* interrupt thread */
ae8e83e6 308#define TDF_TSLEEP_DESCHEDULED 0x00020000 /* tsleep core deschedule */
8ec60c3f 309#define TDF_BLOCKED 0x00040000 /* Thread is blocked */
a7422615 310#define TDF_PANICWARN 0x00080000 /* panic warning in switch */
344ad853 311#define TDF_BLOCKQ 0x00100000 /* on block queue */
c2fba90b 312#define TDF_MPSAFE 0x00200000 /* (thread creation) */
c1102e9f 313#define TDF_EXITING 0x00400000 /* thread exiting */
1b251f0a 314#define TDF_USINGFP 0x00800000 /* thread using fp coproc */
aad81e48 315#define TDF_KERNELFP 0x01000000 /* kernel using fp coproc */
cbb1e737 316#define TDF_NETWORK 0x02000000 /* network proto thread */
345ee1fb 317#define TDF_CRYPTO 0x04000000 /* crypto thread */
f9235b6d 318#define TDF_MARKER 0x80000000 /* fairq marker thread */
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319
320/*
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321 * Thread priorities. Typically only one thread from any given
322 * user process scheduling queue is on the LWKT run queue at a time.
323 * Remember that there is one LWKT run queue per cpu.
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324 *
325 * Critical sections are handled by bumping td_pri above TDPRI_MAX, which
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326 * causes interrupts to be masked as they occur. When this occurs a
327 * rollup flag will be set in mycpu->gd_reqflags.
2df9fa87 328 */
f1d1c3fa 329#define TDPRI_IDLE_THREAD 0 /* the idle thread */
bb6811be 330#define TDPRI_IDLE_WORK 1 /* idle work (page zero, etc) */
50017724 331#define TDPRI_USER_SCHEDULER 2 /* user scheduler helper */
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332#define TDPRI_USER_IDLE 4 /* user scheduler idle */
333#define TDPRI_USER_NORM 6 /* user scheduler normal */
334#define TDPRI_USER_REAL 8 /* user scheduler real time */
9ae9ee8d 335#define TDPRI_KERN_LPSCHED 9 /* scheduler helper for userland sch */
f1d1c3fa 336#define TDPRI_KERN_USER 10 /* kernel / block in syscall */
26a0694b 337#define TDPRI_KERN_DAEMON 12 /* kernel daemon (pageout, etc) */
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338#define TDPRI_SOFT_NORM 14 /* kernel / normal */
339#define TDPRI_SOFT_TIMER 16 /* kernel / timer */
ae8050a4 340#define TDPRI_EXITING 19 /* exiting thread */
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341#define TDPRI_INT_SUPPORT 20 /* kernel / high priority support */
342#define TDPRI_INT_LOW 27 /* low priority interrupt */
343#define TDPRI_INT_MED 28 /* medium priority interrupt */
344#define TDPRI_INT_HIGH 29 /* high priority interrupt */
345#define TDPRI_MAX 31
346
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347/*
348 * Scale is the approximate number of ticks for which we desire the
349 * entire gd_tdrunq to get service. With hz = 100 a scale of 8 is 80ms.
350 *
351 * Setting this value too small will result in inefficient switching
352 * rates.
353 */
354#define TDFAIRQ_SCALE 8
355#define TDFAIRQ_MAX(gd) ((gd)->gd_fairq_total_pri * TDFAIRQ_SCALE)
2df9fa87 356
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357#define LWKT_THREAD_STACK (UPAGES * PAGE_SIZE)
358
ef0fdad1 359#define CACHE_NTHREADS 6
7e1d4bf4 360
f9235b6d 361#define IN_CRITICAL_SECT(td) ((td)->td_critcount)
f8c3996b 362
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363#ifdef _KERNEL
364
365/*
366 * Global tokens
367 */
368extern struct lwkt_token pmap_token;
369extern struct lwkt_token dev_token;
d63ddd9c 370extern struct lwkt_token vm_token;
d39d3c43 371extern struct lwkt_token vmspace_token;
d63ddd9c 372extern struct lwkt_token kvm_token;
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373extern struct lwkt_token proc_token;
374extern struct lwkt_token tty_token;
375extern struct lwkt_token vnode_token;
376
377/*
378 * Procedures
379 */
40aaf5fc 380extern void lwkt_init(void);
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381extern struct thread *lwkt_alloc_thread(struct thread *, int, int, int);
382extern void lwkt_init_thread(struct thread *, void *, int, int,
383 struct globaldata *);
fcefa6f2 384extern void lwkt_set_comm(thread_t, const char *, ...) __printflike(2, 3);
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385extern void lwkt_wait_free(struct thread *);
386extern void lwkt_free_thread(struct thread *);
387extern void lwkt_gdinit(struct globaldata *);
8ad65e08 388extern void lwkt_switch(void);
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389extern void lwkt_preempt(thread_t, int);
390extern void lwkt_schedule(thread_t);
361d01dd 391extern void lwkt_schedule_noresched(thread_t);
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392extern void lwkt_schedule_self(thread_t);
393extern void lwkt_deschedule(thread_t);
394extern void lwkt_deschedule_self(thread_t);
f1d1c3fa 395extern void lwkt_yield(void);
3824f392 396extern void lwkt_user_yield(void);
41a01a4d 397extern void lwkt_token_wait(void);
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398extern void lwkt_hold(thread_t);
399extern void lwkt_rele(thread_t);
3824f392 400extern void lwkt_passive_release(thread_t);
b9665ad7 401
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402extern void lwkt_gettoken(lwkt_token_t);
403extern int lwkt_trytoken(lwkt_token_t);
404extern void lwkt_reltoken(lwkt_token_t);
b37f18d6 405extern int lwkt_getalltokens(thread_t, const char **, const void **);
b9665ad7 406extern void lwkt_relalltokens(thread_t);
41a01a4d 407extern void lwkt_drain_token_requests(void);
b37f18d6 408extern void lwkt_token_init(lwkt_token_t, int, const char *);
b9665ad7 409extern void lwkt_token_uninit(lwkt_token_t);
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410
411extern void lwkt_token_pool_init(void);
c6fbe95a 412extern lwkt_token_t lwkt_token_pool_lookup(void *);
3b998fa9 413extern lwkt_token_t lwkt_getpooltoken(void *);
41a01a4d 414
b9665ad7 415extern void lwkt_setpri(thread_t, int);
03bd0a5e 416extern void lwkt_setpri_initial(thread_t, int);
b9665ad7 417extern void lwkt_setpri_self(int);
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418extern void lwkt_fairq_schedulerclock(thread_t td);
419extern void lwkt_fairq_setpri_self(int pri);
420extern int lwkt_fairq_push(int pri);
421extern void lwkt_fairq_pop(int pri);
422extern void lwkt_fairq_yield(void);
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423extern void lwkt_setcpu_self(struct globaldata *);
424extern void lwkt_migratecpu(int);
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425
426#ifdef SMP
427
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428extern void lwkt_giveaway(struct thread *);
429extern void lwkt_acquire(struct thread *);
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430extern int lwkt_send_ipiq3(struct globaldata *, ipifunc3_t, void *, int);
431extern int lwkt_send_ipiq3_passive(struct globaldata *, ipifunc3_t,
432 void *, int);
433extern int lwkt_send_ipiq3_nowait(struct globaldata *, ipifunc3_t,
434 void *, int);
435extern int lwkt_send_ipiq3_bycpu(int, ipifunc3_t, void *, int);
436extern int lwkt_send_ipiq3_mask(cpumask_t, ipifunc3_t, void *, int);
437extern void lwkt_wait_ipiq(struct globaldata *, int);
438extern int lwkt_seq_ipiq(struct globaldata *);
96728c05 439extern void lwkt_process_ipiq(void);
b9665ad7 440extern void lwkt_process_ipiq_frame(struct intrframe *);
b8a98473 441extern void lwkt_smp_stopped(void);
6c92c1f2 442extern void lwkt_synchronize_ipiqs(const char *);
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443
444#endif /* SMP */
445
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446extern void lwkt_cpusync_simple(cpumask_t, cpusync_func_t, void *);
447extern void lwkt_cpusync_fastdata(cpumask_t, cpusync_func2_t, void *);
448extern void lwkt_cpusync_start(cpumask_t, lwkt_cpusync_t);
449extern void lwkt_cpusync_add(cpumask_t, lwkt_cpusync_t);
450extern void lwkt_cpusync_finish(lwkt_cpusync_t);
b8a98473 451
26a0694b 452extern void crit_panic(void);
553ea3c8 453extern struct lwp *lwkt_preempted_proc(void);
4b5f931b 454
b9665ad7 455extern int lwkt_create (void (*func)(void *), void *, struct thread **,
fcefa6f2
SW
456 struct thread *, int, int,
457 const char *, ...) __printflike(7, 8);
b153f746 458extern void lwkt_exit (void) __dead2;
e56e4dea 459extern void lwkt_remove_tdallq (struct thread *);
99df837e 460
2df9fa87
MD
461#endif
462
c9aa7a82
MD
463#endif
464