1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _SYS_THREAD_H 28 #define _SYS_THREAD_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include <sys/types.h> 33 #include <sys/t_lock.h> 34 #include <sys/klwp.h> 35 #include <sys/time.h> 36 #include <sys/signal.h> 37 #include <sys/kcpc.h> 38 #if defined(__GNUC__) && defined(_ASM_INLINES) && defined(_KERNEL) 39 #include <asm/thread.h> 40 #endif 41 42 #ifdef __cplusplus 43 extern "C" { 44 #endif 45 46 /* 47 * The thread object, its states, and the methods by which it 48 * is accessed. 49 */ 50 51 /* 52 * Values that t_state may assume. Note that t_state cannot have more 53 * than one of these flags set at a time. 54 */ 55 #define TS_FREE 0x00 /* Thread at loose ends */ 56 #define TS_SLEEP 0x01 /* Awaiting an event */ 57 #define TS_RUN 0x02 /* Runnable, but not yet on a processor */ 58 #define TS_ONPROC 0x04 /* Thread is being run on a processor */ 59 #define TS_ZOMB 0x08 /* Thread has died but hasn't been reaped */ 60 #define TS_STOPPED 0x10 /* Stopped, initial state */ 61 #define TS_WAIT 0x20 /* Waiting to become runnable */ 62 63 typedef struct ctxop { 64 void (*save_op)(void *); /* function to invoke to save context */ 65 void (*restore_op)(void *); /* function to invoke to restore ctx */ 66 void (*fork_op)(void *, void *); /* invoke to fork context */ 67 void (*lwp_create_op)(void *, void *); /* lwp_create context */ 68 void (*exit_op)(void *); /* invoked during {thread,lwp}_exit() */ 69 void (*free_op)(void *, int); /* function which frees the context */ 70 void *arg; /* argument to above functions, ctx pointer */ 71 struct ctxop *next; /* next context ops */ 72 } ctxop_t; 73 74 /* 75 * The active file descriptor table. 76 * Each member of a_fd[] not equalling -1 represents an active fd. 77 * The structure is initialized on first use; all zeros means uninitialized. 78 */ 79 typedef struct _afd { 80 int *a_fd; /* pointer to list of fds */ 81 short a_nfd; /* number of entries in *a_fd */ 82 short a_stale; /* one of the active fds is being closed */ 83 int a_buf[1]; /* buffer to which a_fd initially refers */ 84 } afd_t; 85 86 /* 87 * An lwpchan provides uniqueness when sleeping on user-level 88 * synchronization primitives. The lc_wchan member is used 89 * for sleeping on kernel synchronization primitives. 90 */ 91 typedef struct { 92 caddr_t lc_wchan0; 93 caddr_t lc_wchan; 94 } lwpchan_t; 95 96 typedef struct _kthread *kthread_id_t; 97 98 struct turnstile; 99 struct trap_info; 100 struct upimutex; 101 struct kproject; 102 struct on_trap_data; 103 struct waitq; 104 105 /* Definition for kernel thread identifier type */ 106 typedef uint64_t kt_did_t; 107 108 typedef struct _kthread { 109 struct _kthread *t_link; /* dispq, sleepq, and free queue link */ 110 111 caddr_t t_stk; /* base of stack (kernel sp value to use) */ 112 void (*t_startpc)(void); /* PC where thread started */ 113 struct cpu *t_bound_cpu; /* cpu bound to, or NULL if not bound */ 114 short t_affinitycnt; /* nesting level of kernel affinity-setting */ 115 short t_bind_cpu; /* user-specified CPU binding (-1 if none) */ 116 ushort_t t_flag; /* modified only by current thread */ 117 ushort_t t_proc_flag; /* modified holding ttproc(t)->p_lock */ 118 ushort_t t_schedflag; /* modified holding thread_lock(t) */ 119 volatile char t_preempt; /* don't preempt thread if set */ 120 volatile char t_preempt_lk; 121 uint_t t_state; /* thread state (protected by thread_lock) */ 122 pri_t t_pri; /* assigned thread priority */ 123 pri_t t_epri; /* inherited thread priority */ 124 char t_writer; /* sleeping in lwp_rwlock_lock(RW_WRITE_LOCK) */ 125 label_t t_pcb; /* pcb, save area when switching */ 126 lwpchan_t t_lwpchan; /* reason for blocking */ 127 #define t_wchan0 t_lwpchan.lc_wchan0 128 #define t_wchan t_lwpchan.lc_wchan 129 struct _sobj_ops *t_sobj_ops; 130 id_t t_cid; /* scheduling class id */ 131 struct thread_ops *t_clfuncs; /* scheduling class ops vector */ 132 void *t_cldata; /* per scheduling class specific data */ 133 ctxop_t *t_ctx; /* thread context */ 134 uintptr_t t_lofault; /* ret pc for failed page faults */ 135 label_t *t_onfault; /* on_fault() setjmp buf */ 136 struct on_trap_data *t_ontrap; /* on_trap() protection data */ 137 caddr_t t_swap; /* swappable thread storage */ 138 lock_t t_lock; /* used to resume() a thread */ 139 uint8_t t_lockstat; /* set while thread is in lockstat code */ 140 uint8_t t_pil; /* interrupt thread PIL */ 141 disp_lock_t t_pi_lock; /* lock protecting t_prioinv list */ 142 char t_nomigrate; /* do not migrate if set */ 143 struct cpu *t_cpu; /* CPU that thread last ran on */ 144 struct cpu *t_weakbound_cpu; /* cpu weakly bound to */ 145 struct lgrp_ld *t_lpl; /* load average for home lgroup */ 146 void *t_lgrp_reserv[2]; /* reserved for future */ 147 struct _kthread *t_intr; /* interrupted (pinned) thread */ 148 uint64_t t_intr_start; /* timestamp when time slice began */ 149 kt_did_t t_did; /* thread id for kernel debuggers */ 150 caddr_t t_tnf_tpdp; /* Trace facility data pointer */ 151 kcpc_ctx_t *t_cpc_ctx; /* performance counter context */ 152 kcpc_set_t *t_cpc_set; /* set this thread has bound */ 153 154 /* 155 * non swappable part of the lwp state. 156 */ 157 id_t t_tid; /* lwp's id */ 158 id_t t_waitfor; /* target lwp id in lwp_wait() */ 159 struct sigqueue *t_sigqueue; /* queue of siginfo structs */ 160 k_sigset_t t_sig; /* signals pending to this process */ 161 k_sigset_t t_extsig; /* signals sent from another contract */ 162 k_sigset_t t_hold; /* hold signal bit mask */ 163 struct _kthread *t_forw; /* process's forward thread link */ 164 struct _kthread *t_back; /* process's backward thread link */ 165 struct _kthread *t_thlink; /* tid (lwpid) lookup hash link */ 166 klwp_t *t_lwp; /* thread's lwp pointer */ 167 struct proc *t_procp; /* proc pointer */ 168 struct t_audit_data *t_audit_data; /* per thread audit data */ 169 struct _kthread *t_next; /* doubly linked list of all threads */ 170 struct _kthread *t_prev; 171 ushort_t t_whystop; /* reason for stopping */ 172 ushort_t t_whatstop; /* more detailed reason */ 173 int t_dslot; /* index in proc's thread directory */ 174 struct pollstate *t_pollstate; /* state used during poll(2) */ 175 struct pollcache *t_pollcache; /* to pass a pcache ptr by /dev/poll */ 176 struct cred *t_cred; /* pointer to current cred */ 177 time_t t_start; /* start time, seconds since epoch */ 178 clock_t t_lbolt; /* lbolt at last clock_tick() */ 179 hrtime_t t_stoptime; /* timestamp at stop() */ 180 uint_t t_pctcpu; /* %cpu at last clock_tick(), binary */ 181 /* point at right of high-order bit */ 182 short t_sysnum; /* system call number */ 183 kcondvar_t t_delay_cv; 184 kmutex_t t_delay_lock; 185 186 /* 187 * Pointer to the dispatcher lock protecting t_state and state-related 188 * flags. This pointer can change during waits on the lock, so 189 * it should be grabbed only by thread_lock(). 190 */ 191 disp_lock_t *t_lockp; /* pointer to the dispatcher lock */ 192 ushort_t t_oldspl; /* spl level before dispatcher locked */ 193 volatile char t_pre_sys; /* pre-syscall work needed */ 194 lock_t t_lock_flush; /* for lock_mutex_flush() impl */ 195 struct _disp *t_disp_queue; /* run queue for chosen CPU */ 196 clock_t t_disp_time; /* last time this thread was running */ 197 uint_t t_kpri_req; /* kernel priority required */ 198 199 /* 200 * Post-syscall / post-trap flags. 201 * No lock is required to set these. 202 * These must be cleared only by the thread itself. 203 * 204 * t_astflag indicates that some post-trap processing is required, 205 * possibly a signal or a preemption. The thread will not 206 * return to user with this set. 207 * t_post_sys indicates that some unusualy post-system call 208 * handling is required, such as an error or tracing. 209 * t_sig_check indicates that some condition in ISSIG() must be 210 * checked, but doesn't prevent returning to user. 211 * t_post_sys_ast is a way of checking whether any of these three 212 * flags are set. 213 */ 214 union __tu { 215 struct __ts { 216 volatile char _t_astflag; /* AST requested */ 217 volatile char _t_sig_check; /* ISSIG required */ 218 volatile char _t_post_sys; /* post_syscall req */ 219 volatile char _t_trapret; /* call CL_TRAPRET */ 220 } _ts; 221 volatile int _t_post_sys_ast; /* OR of these flags */ 222 } _tu; 223 #define t_astflag _tu._ts._t_astflag 224 #define t_sig_check _tu._ts._t_sig_check 225 #define t_post_sys _tu._ts._t_post_sys 226 #define t_trapret _tu._ts._t_trapret 227 #define t_post_sys_ast _tu._t_post_sys_ast 228 229 /* 230 * Real time microstate profiling. 231 */ 232 /* possible 4-byte filler */ 233 hrtime_t t_waitrq; /* timestamp for run queue wait time */ 234 int t_mstate; /* current microstate */ 235 struct rprof { 236 int rp_anystate; /* set if any state non-zero */ 237 uint_t rp_state[NMSTATES]; /* mstate profiling counts */ 238 } *t_rprof; 239 240 /* 241 * There is a turnstile inserted into the list below for 242 * every priority inverted synchronization object that 243 * this thread holds. 244 */ 245 246 struct turnstile *t_prioinv; 247 248 /* 249 * Pointer to the turnstile attached to the synchronization 250 * object where this thread is blocked. 251 */ 252 253 struct turnstile *t_ts; 254 255 /* 256 * kernel thread specific data 257 * Borrowed from userland implementation of POSIX tsd 258 */ 259 struct tsd_thread { 260 struct tsd_thread *ts_next; /* threads with TSD */ 261 struct tsd_thread *ts_prev; /* threads with TSD */ 262 uint_t ts_nkeys; /* entries in value array */ 263 void **ts_value; /* array of value/key */ 264 } *t_tsd; 265 266 clock_t t_stime; /* time stamp used by the swapper */ 267 struct door_data *t_door; /* door invocation data */ 268 kmutex_t *t_plockp; /* pointer to process's p_lock */ 269 270 struct sc_shared *t_schedctl; /* scheduler activations shared data */ 271 uintptr_t t_sc_uaddr; /* user-level address of shared data */ 272 273 struct cpupart *t_cpupart; /* partition containing thread */ 274 int t_bind_pset; /* processor set binding */ 275 276 struct copyops *t_copyops; /* copy in/out ops vector */ 277 278 caddr_t t_stkbase; /* base of the the stack */ 279 struct page *t_red_pp; /* if non-NULL, redzone is mapped */ 280 281 struct _afd t_activefd; /* active file descriptor table */ 282 283 struct _kthread *t_priforw; /* sleepq per-priority sublist */ 284 struct _kthread *t_priback; 285 286 struct sleepq *t_sleepq; /* sleep queue thread is waiting on */ 287 struct trap_info *t_panic_trap; /* saved data from fatal trap */ 288 int *t_lgrp_affinity; /* lgroup affinity */ 289 struct upimutex *t_upimutex; /* list of upimutexes owned by thread */ 290 uint32_t t_nupinest; /* number of nested held upi mutexes */ 291 struct kproject *t_proj; /* project containing this thread */ 292 uint8_t t_unpark; /* modified holding t_delay_lock */ 293 uint8_t t_release; /* lwp_release() waked up the thread */ 294 uint8_t t_hatdepth; /* depth of recursive hat_memloads */ 295 kcondvar_t t_joincv; /* cv used to wait for thread exit */ 296 void *t_taskq; /* for threads belonging to taskq */ 297 hrtime_t t_anttime; /* most recent time anticipatory load */ 298 /* was added to an lgroup's load */ 299 /* on this thread's behalf */ 300 char *t_pdmsg; /* privilege debugging message */ 301 302 uint_t t_predcache; /* DTrace predicate cache */ 303 hrtime_t t_dtrace_vtime; /* DTrace virtual time */ 304 hrtime_t t_dtrace_start; /* DTrace slice start time */ 305 306 uint8_t t_dtrace_stop; /* indicates a DTrace-desired stop */ 307 uint8_t t_dtrace_sig; /* signal sent via DTrace's raise() */ 308 309 union __tdu { 310 struct __tds { 311 uint8_t _t_dtrace_on; /* hit a fasttrap tracepoint */ 312 uint8_t _t_dtrace_step; /* about to return to kernel */ 313 uint8_t _t_dtrace_ret; /* handling a return probe */ 314 uint8_t _t_dtrace_ast; /* saved ast flag */ 315 #ifdef __amd64 316 uint8_t _t_dtrace_reg; /* modified register */ 317 #endif 318 } _tds; 319 ulong_t _t_dtrace_ft; /* bitwise or of these flags */ 320 } _tdu; 321 #define t_dtrace_ft _tdu._t_dtrace_ft 322 #define t_dtrace_on _tdu._tds._t_dtrace_on 323 #define t_dtrace_step _tdu._tds._t_dtrace_step 324 #define t_dtrace_ret _tdu._tds._t_dtrace_ret 325 #define t_dtrace_ast _tdu._tds._t_dtrace_ast 326 #ifdef __amd64 327 #define t_dtrace_reg _tdu._tds._t_dtrace_reg 328 #endif 329 330 uintptr_t t_dtrace_pc; /* DTrace saved pc from fasttrap */ 331 uintptr_t t_dtrace_npc; /* DTrace next pc from fasttrap */ 332 uintptr_t t_dtrace_scrpc; /* DTrace per-thread scratch location */ 333 uintptr_t t_dtrace_astpc; /* DTrace return sequence location */ 334 #ifdef __amd64 335 uint64_t t_dtrace_regv; /* DTrace saved reg from fasttrap */ 336 #endif 337 hrtime_t t_hrtime; /* high-res last time on cpu */ 338 kmutex_t t_ctx_lock; /* protects t_ctx in removectx() */ 339 struct waitq *t_waitq; /* wait queue */ 340 } kthread_t; 341 342 /* 343 * Thread flag (t_flag) definitions. 344 * These flags must be changed only for the current thread, 345 * and not during preemption code, since the code being 346 * preempted could be modifying the flags. 347 * 348 * For the most part these flags do not need locking. 349 * The following flags will only be changed while the thread_lock is held, 350 * to give assurrance that they are consistent with t_state: 351 * T_WAKEABLE 352 */ 353 #define T_INTR_THREAD 0x0001 /* thread is an interrupt thread */ 354 #define T_WAKEABLE 0x0002 /* thread is blocked, signals enabled */ 355 #define T_TOMASK 0x0004 /* use lwp_sigoldmask on return from signal */ 356 #define T_TALLOCSTK 0x0008 /* thread structure allocated from stk */ 357 #define T_FORKALL 0x0010 /* thread was cloned by forkall() */ 358 #define T_WOULDBLOCK 0x0020 /* for lockfs */ 359 #define T_DONTBLOCK 0x0040 /* for lockfs */ 360 #define T_DONTPEND 0x0080 /* for lockfs */ 361 #define T_SYS_PROF 0x0100 /* profiling on for duration of system call */ 362 #define T_WAITCVSEM 0x0200 /* waiting for a lwp_cv or lwp_sema on sleepq */ 363 #define T_WATCHPT 0x0400 /* thread undergoing a watchpoint emulation */ 364 #define T_PANIC 0x0800 /* thread initiated a system panic */ 365 #define T_DFLTSTK 0x1000 /* stack is default size */ 366 #define T_CAPTURING 0x2000 /* thread is in page capture logic */ 367 #define T_VFPARENT 0x4000 /* thread is vfork parent, must call vfwait */ 368 369 /* 370 * Flags in t_proc_flag. 371 * These flags must be modified only when holding the p_lock 372 * for the associated process. 373 */ 374 #define TP_DAEMON 0x0001 /* this is an LWP_DAEMON lwp */ 375 #define TP_HOLDLWP 0x0002 /* hold thread's lwp */ 376 #define TP_TWAIT 0x0004 /* wait to be freed by lwp_wait() */ 377 #define TP_LWPEXIT 0x0008 /* lwp has exited */ 378 #define TP_PRSTOP 0x0010 /* thread is being stopped via /proc */ 379 #define TP_CHKPT 0x0020 /* thread is being stopped via CPR checkpoint */ 380 #define TP_EXITLWP 0x0040 /* terminate this lwp */ 381 #define TP_PRVSTOP 0x0080 /* thread is virtually stopped via /proc */ 382 #define TP_MSACCT 0x0100 /* collect micro-state accounting information */ 383 #define TP_STOPPING 0x0200 /* thread is executing stop() */ 384 #define TP_WATCHPT 0x0400 /* process has watchpoints in effect */ 385 #define TP_PAUSE 0x0800 /* process is being stopped via pauselwps() */ 386 #define TP_CHANGEBIND 0x1000 /* thread has a new cpu/cpupart binding */ 387 #define TP_ZTHREAD 0x2000 /* this is a kernel thread for a zone */ 388 #define TP_WATCHSTOP 0x4000 /* thread is stopping via holdwatch() */ 389 390 /* 391 * Thread scheduler flag (t_schedflag) definitions. 392 * The thread must be locked via thread_lock() or equiv. to change these. 393 */ 394 #define TS_LOAD 0x0001 /* thread is in memory */ 395 #define TS_DONT_SWAP 0x0002 /* thread/lwp should not be swapped */ 396 #define TS_SWAPENQ 0x0004 /* swap thread when it reaches a safe point */ 397 #define TS_ON_SWAPQ 0x0008 /* thread is on the swap queue */ 398 #define TS_SIGNALLED 0x0010 /* thread was awakened by cv_signal() */ 399 #define TS_PROJWAITQ 0x0020 /* thread is on its project's waitq */ 400 #define TS_ZONEWAITQ 0x0040 /* thread is on its zone's waitq */ 401 #define TS_CSTART 0x0100 /* setrun() by continuelwps() */ 402 #define TS_UNPAUSE 0x0200 /* setrun() by unpauselwps() */ 403 #define TS_XSTART 0x0400 /* setrun() by SIGCONT */ 404 #define TS_PSTART 0x0800 /* setrun() by /proc */ 405 #define TS_RESUME 0x1000 /* setrun() by CPR resume process */ 406 #define TS_CREATE 0x2000 /* setrun() by syslwp_create() */ 407 #define TS_RUNQMATCH 0x4000 /* exact run queue balancing by setbackdq() */ 408 #define TS_ALLSTART \ 409 (TS_CSTART|TS_UNPAUSE|TS_XSTART|TS_PSTART|TS_RESUME|TS_CREATE) 410 #define TS_ANYWAITQ (TS_PROJWAITQ|TS_ZONEWAITQ) 411 412 /* 413 * No locking needed for AST field. 414 */ 415 #define aston(t) ((t)->t_astflag = 1) 416 #define astoff(t) ((t)->t_astflag = 0) 417 418 /* True if thread is stopped on an event of interest */ 419 #define ISTOPPED(t) ((t)->t_state == TS_STOPPED && \ 420 !((t)->t_schedflag & TS_PSTART)) 421 422 /* True if thread is asleep and wakeable */ 423 #define ISWAKEABLE(t) (((t)->t_state == TS_SLEEP && \ 424 ((t)->t_flag & T_WAKEABLE))) 425 426 /* True if thread is on the wait queue */ 427 #define ISWAITING(t) ((t)->t_state == TS_WAIT) 428 429 /* similar to ISTOPPED except the event of interest is CPR */ 430 #define CPR_ISTOPPED(t) ((t)->t_state == TS_STOPPED && \ 431 !((t)->t_schedflag & TS_RESUME)) 432 433 /* 434 * True if thread is virtually stopped (is or was asleep in 435 * one of the lwp_*() system calls and marked to stop by /proc.) 436 */ 437 #define VSTOPPED(t) ((t)->t_proc_flag & TP_PRVSTOP) 438 439 /* similar to VSTOPPED except the point of interest is CPR */ 440 #define CPR_VSTOPPED(t) \ 441 ((t)->t_state == TS_SLEEP && \ 442 (t)->t_wchan0 != NULL && \ 443 ((t)->t_flag & T_WAKEABLE) && \ 444 ((t)->t_proc_flag & TP_CHKPT)) 445 446 /* True if thread has been stopped by hold*() or was created stopped */ 447 #define SUSPENDED(t) ((t)->t_state == TS_STOPPED && \ 448 ((t)->t_schedflag & (TS_CSTART|TS_UNPAUSE)) != (TS_CSTART|TS_UNPAUSE)) 449 450 /* True if thread possesses an inherited priority */ 451 #define INHERITED(t) ((t)->t_epri != 0) 452 453 /* The dispatch priority of a thread */ 454 #define DISP_PRIO(t) ((t)->t_epri > (t)->t_pri ? (t)->t_epri : (t)->t_pri) 455 456 /* The assigned priority of a thread */ 457 #define ASSIGNED_PRIO(t) ((t)->t_pri) 458 459 /* 460 * Macros to determine whether a thread can be swapped. 461 * If t_lock is held, the thread is either on a processor or being swapped. 462 */ 463 #define SWAP_OK(t) (!LOCK_HELD(&(t)->t_lock)) 464 465 /* 466 * proctot(x) 467 * convert a proc pointer to a thread pointer. this only works with 468 * procs that have only one lwp. 469 * 470 * proctolwp(x) 471 * convert a proc pointer to a lwp pointer. this only works with 472 * procs that have only one lwp. 473 * 474 * ttolwp(x) 475 * convert a thread pointer to its lwp pointer. 476 * 477 * ttoproc(x) 478 * convert a thread pointer to its proc pointer. 479 * 480 * ttoproj(x) 481 * convert a thread pointer to its project pointer. 482 * 483 * ttozone(x) 484 * convert a thread pointer to its zone pointer. 485 * 486 * lwptot(x) 487 * convert a lwp pointer to its thread pointer. 488 * 489 * lwptoproc(x) 490 * convert a lwp to its proc pointer. 491 */ 492 #define proctot(x) ((x)->p_tlist) 493 #define proctolwp(x) ((x)->p_tlist->t_lwp) 494 #define ttolwp(x) ((x)->t_lwp) 495 #define ttoproc(x) ((x)->t_procp) 496 #define ttoproj(x) ((x)->t_proj) 497 #define ttozone(x) ((x)->t_procp->p_zone) 498 #define lwptot(x) ((x)->lwp_thread) 499 #define lwptoproc(x) ((x)->lwp_procp) 500 501 #define t_pc t_pcb.val[0] 502 #define t_sp t_pcb.val[1] 503 504 #ifdef _KERNEL 505 506 extern kthread_t *threadp(void); /* inline, returns thread pointer */ 507 #define curthread (threadp()) /* current thread pointer */ 508 #define curproc (ttoproc(curthread)) /* current process pointer */ 509 #define curproj (ttoproj(curthread)) /* current project pointer */ 510 #define curzone (curproc->p_zone) /* current zone pointer */ 511 512 extern struct _kthread t0; /* the scheduler thread */ 513 extern kmutex_t pidlock; /* global process lock */ 514 515 /* 516 * thread_free_lock is used by the clock thread to keep a thread 517 * from being freed while it is being examined. 518 */ 519 extern kmutex_t thread_free_lock; 520 521 /* 522 * Routines to change the priority and effective priority 523 * of a thread-locked thread, whatever its state. 524 */ 525 extern int thread_change_pri(kthread_t *t, pri_t disp_pri, int front); 526 extern void thread_change_epri(kthread_t *t, pri_t disp_pri); 527 528 /* 529 * Routines that manipulate the dispatcher lock for the thread. 530 * The locking heirarchy is as follows: 531 * cpu_lock > sleepq locks > run queue locks 532 */ 533 void thread_transition(kthread_t *); /* move to transition lock */ 534 void thread_stop(kthread_t *); /* move to stop lock */ 535 void thread_lock(kthread_t *); /* lock thread and its queue */ 536 void thread_lock_high(kthread_t *); /* lock thread and its queue */ 537 void thread_onproc(kthread_t *, struct cpu *); /* set onproc state lock */ 538 539 #define thread_unlock(t) disp_lock_exit((t)->t_lockp) 540 #define thread_unlock_high(t) disp_lock_exit_high((t)->t_lockp) 541 #define thread_unlock_nopreempt(t) disp_lock_exit_nopreempt((t)->t_lockp) 542 543 #define THREAD_LOCK_HELD(t) (DISP_LOCK_HELD((t)->t_lockp)) 544 545 extern disp_lock_t transition_lock; /* lock protecting transiting threads */ 546 extern disp_lock_t stop_lock; /* lock protecting stopped threads */ 547 548 caddr_t thread_stk_init(caddr_t); /* init thread stack */ 549 550 #endif /* _KERNEL */ 551 552 /* 553 * Macros to indicate that the thread holds resources that could be critical 554 * to other kernel threads, so this thread needs to have kernel priority 555 * if it blocks or is preempted. Note that this is not necessary if the 556 * resource is a mutex or a writer lock because of priority inheritance. 557 * 558 * The only way one thread may legally manipulate another thread's t_kpri_req 559 * is to hold the target thread's thread lock while that thread is asleep. 560 * (The rwlock code does this to implement direct handoff to waiting readers.) 561 */ 562 #define THREAD_KPRI_REQUEST() (curthread->t_kpri_req++) 563 #define THREAD_KPRI_RELEASE() (curthread->t_kpri_req--) 564 #define THREAD_KPRI_RELEASE_N(n) (curthread->t_kpri_req -= (n)) 565 566 /* 567 * Macro to change a thread's priority. 568 */ 569 #define THREAD_CHANGE_PRI(t, pri) { \ 570 pri_t __new_pri = (pri); \ 571 DTRACE_SCHED2(change__pri, kthread_t *, (t), pri_t, __new_pri); \ 572 (t)->t_pri = __new_pri; \ 573 } 574 575 /* 576 * Macro to indicate that a thread's priority is about to be changed. 577 */ 578 #define THREAD_WILLCHANGE_PRI(t, pri) { \ 579 DTRACE_SCHED2(change__pri, kthread_t *, (t), pri_t, (pri)); \ 580 } 581 582 /* 583 * Macros to change thread state and the associated lock. 584 */ 585 #define THREAD_SET_STATE(tp, state, lp) \ 586 ((tp)->t_state = state, (tp)->t_lockp = lp) 587 588 /* 589 * Point it at the transition lock, which is always held. 590 * The previosly held lock is dropped. 591 */ 592 #define THREAD_TRANSITION(tp) thread_transition(tp); 593 /* 594 * Set the thread's lock to be the transition lock, without dropping 595 * previosly held lock. 596 */ 597 #define THREAD_TRANSITION_NOLOCK(tp) ((tp)->t_lockp = &transition_lock) 598 599 /* 600 * Put thread in run state, and set the lock pointer to the dispatcher queue 601 * lock pointer provided. This lock should be held. 602 */ 603 #define THREAD_RUN(tp, lp) THREAD_SET_STATE(tp, TS_RUN, lp) 604 605 /* 606 * Put thread in wait state, and set the lock pointer to the wait queue 607 * lock pointer provided. This lock should be held. 608 */ 609 #define THREAD_WAIT(tp, lp) THREAD_SET_STATE(tp, TS_WAIT, lp) 610 611 /* 612 * Put thread in run state, and set the lock pointer to the dispatcher queue 613 * lock pointer provided (i.e., the "swapped_lock"). This lock should be held. 614 */ 615 #define THREAD_SWAP(tp, lp) THREAD_SET_STATE(tp, TS_RUN, lp) 616 617 /* 618 * Put the thread in zombie state and set the lock pointer to NULL. 619 * The NULL will catch anything that tries to lock a zombie. 620 */ 621 #define THREAD_ZOMB(tp) THREAD_SET_STATE(tp, TS_ZOMB, NULL) 622 623 /* 624 * Set the thread into ONPROC state, and point the lock at the CPUs 625 * lock for the onproc thread(s). This lock should be held, so the 626 * thread deoes not become unlocked, since these stores can be reordered. 627 */ 628 #define THREAD_ONPROC(tp, cpu) \ 629 THREAD_SET_STATE(tp, TS_ONPROC, &(cpu)->cpu_thread_lock) 630 631 /* 632 * Set the thread into the TS_SLEEP state, and set the lock pointer to 633 * to some sleep queue's lock. The new lock should already be held. 634 */ 635 #define THREAD_SLEEP(tp, lp) { \ 636 disp_lock_t *tlp; \ 637 tlp = (tp)->t_lockp; \ 638 THREAD_SET_STATE(tp, TS_SLEEP, lp); \ 639 disp_lock_exit_high(tlp); \ 640 } 641 642 /* 643 * Interrupt threads are created in TS_FREE state, and their lock 644 * points at the associated CPU's lock. 645 */ 646 #define THREAD_FREEINTR(tp, cpu) \ 647 THREAD_SET_STATE(tp, TS_FREE, &(cpu)->cpu_thread_lock) 648 649 #ifdef __cplusplus 650 } 651 #endif 652 653 #endif /* _SYS_THREAD_H */ 654