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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 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 62 typedef struct ctxop { 63 void (*save_op)(void *); /* function to invoke to save context */ 64 void (*restore_op)(void *); /* function to invoke to restore ctx */ 65 void (*fork_op)(void *, void *); /* invoke to fork context */ 66 void (*lwp_create_op)(void *, void *); /* lwp_create context */ 67 void (*exit_op)(void *); /* invoked during {thread,lwp}_exit() */ 68 void (*free_op)(void *, int); /* function which frees the context */ 69 void *arg; /* argument to above functions, ctx pointer */ 70 struct ctxop *next; /* next context ops */ 71 } ctxop_t; 72 73 /* 74 * The active file descriptor table. 75 * Each member of a_fd[] not equalling -1 represents an active fd. 76 * The structure is initialized on first use; all zeros means uninitialized. 77 */ 78 typedef struct _afd { 79 int *a_fd; /* pointer to list of fds */ 80 short a_nfd; /* number of entries in *a_fd */ 81 short a_stale; /* one of the active fds is being closed */ 82 int a_buf[1]; /* buffer to which a_fd initially refers */ 83 } afd_t; 84 85 /* 86 * An lwpchan provides uniqueness when sleeping on user-level 87 * synchronization primitives. The lc_wchan member is used 88 * for sleeping on kernel synchronization primitives. 89 */ 90 typedef struct { 91 caddr_t lc_wchan0; 92 caddr_t lc_wchan; 93 } lwpchan_t; 94 95 typedef struct _kthread *kthread_id_t; 96 97 struct turnstile; 98 struct trap_info; 99 struct upimutex; 100 struct kproject; 101 struct on_trap_data; 102 103 /* Definition for kernel thread identifier type */ 104 typedef uint64_t kt_did_t; 105 106 typedef struct _kthread { 107 struct _kthread *t_link; /* dispq, sleepq, and free queue link */ 108 109 caddr_t t_stk; /* base of stack (kernel sp value to use) */ 110 void (*t_startpc)(void); /* PC where thread started */ 111 struct cpu *t_bound_cpu; /* cpu bound to, or NULL if not bound */ 112 short t_affinitycnt; /* nesting level of kernel affinity-setting */ 113 short t_bind_cpu; /* user-specified CPU binding (-1 if none) */ 114 ushort_t t_flag; /* modified only by current thread */ 115 ushort_t t_proc_flag; /* modified holding ttproc(t)->p_lock */ 116 ushort_t t_schedflag; /* modified holding thread_lock(t) */ 117 volatile char t_preempt; /* don't preempt thread if set */ 118 volatile char t_preempt_lk; 119 uint_t t_state; /* thread state (protected by thread_lock) */ 120 pri_t t_pri; /* assigned thread priority */ 121 pri_t t_epri; /* inherited thread priority */ 122 char t_writer; /* sleeping in lwp_rwlock_lock(RW_WRITE_LOCK) */ 123 label_t t_pcb; /* pcb, save area when switching */ 124 lwpchan_t t_lwpchan; /* reason for blocking */ 125 #define t_wchan0 t_lwpchan.lc_wchan0 126 #define t_wchan t_lwpchan.lc_wchan 127 struct _sobj_ops *t_sobj_ops; 128 id_t t_cid; /* scheduling class id */ 129 struct thread_ops *t_clfuncs; /* scheduling class ops vector */ 130 void *t_cldata; /* per scheduling class specific data */ 131 ctxop_t *t_ctx; /* thread context */ 132 uintptr_t t_lofault; /* ret pc for failed page faults */ 133 label_t *t_onfault; /* on_fault() setjmp buf */ 134 struct on_trap_data *t_ontrap; /* on_trap() protection data */ 135 caddr_t t_swap; /* swappable thread storage */ 136 lock_t t_lock; /* used to resume() a thread */ 137 uint8_t t_lockstat; /* set while thread is in lockstat code */ 138 uint8_t t_pil; /* interrupt thread PIL */ 139 disp_lock_t t_pi_lock; /* lock protecting t_prioinv list */ 140 char t_nomigrate; /* do not migrate if set */ 141 struct cpu *t_cpu; /* CPU that thread last ran on */ 142 struct cpu *t_weakbound_cpu; /* cpu weakly bound to */ 143 struct lgrp_ld *t_lpl; /* load average for home lgroup */ 144 void *t_lgrp_reserv[2]; /* reserved for future */ 145 struct _kthread *t_intr; /* interrupted (pinned) thread */ 146 uint64_t t_intr_start; /* timestamp when time slice began */ 147 kt_did_t t_did; /* thread id for kernel debuggers */ 148 caddr_t t_tnf_tpdp; /* Trace facility data pointer */ 149 kcpc_ctx_t *t_cpc_ctx; /* performance counter context */ 150 kcpc_set_t *t_cpc_set; /* set this thread has bound */ 151 152 /* 153 * non swappable part of the lwp state. 154 */ 155 id_t t_tid; /* lwp's id */ 156 id_t t_waitfor; /* target lwp id in lwp_wait() */ 157 struct sigqueue *t_sigqueue; /* queue of siginfo structs */ 158 k_sigset_t t_sig; /* signals pending to this process */ 159 k_sigset_t t_extsig; /* signals sent from another contract */ 160 k_sigset_t t_hold; /* hold signal bit mask */ 161 struct _kthread *t_forw; /* process's forward thread link */ 162 struct _kthread *t_back; /* process's backward thread link */ 163 struct _kthread *t_thlink; /* tid (lwpid) lookup hash link */ 164 klwp_t *t_lwp; /* thread's lwp pointer */ 165 struct proc *t_procp; /* proc pointer */ 166 struct t_audit_data *t_audit_data; /* per thread audit data */ 167 struct _kthread *t_next; /* doubly linked list of all threads */ 168 struct _kthread *t_prev; 169 ushort_t t_whystop; /* reason for stopping */ 170 ushort_t t_whatstop; /* more detailed reason */ 171 int t_dslot; /* index in proc's thread directory */ 172 struct pollstate *t_pollstate; /* state used during poll(2) */ 173 struct pollcache *t_pollcache; /* to pass a pcache ptr by /dev/poll */ 174 struct cred *t_cred; /* pointer to current cred */ 175 time_t t_start; /* start time, seconds since epoch */ 176 clock_t t_lbolt; /* lbolt at last clock_tick() */ 177 hrtime_t t_stoptime; /* timestamp at stop() */ 178 uint_t t_pctcpu; /* %cpu at last clock_tick(), binary */ 179 /* point at right of high-order bit */ 180 short t_sysnum; /* system call number */ 181 kcondvar_t t_delay_cv; 182 kmutex_t t_delay_lock; 183 184 /* 185 * Pointer to the dispatcher lock protecting t_state and state-related 186 * flags. This pointer can change during waits on the lock, so 187 * it should be grabbed only by thread_lock(). 188 */ 189 disp_lock_t *t_lockp; /* pointer to the dispatcher lock */ 190 ushort_t t_oldspl; /* spl level before dispatcher locked */ 191 volatile char t_pre_sys; /* pre-syscall work needed */ 192 lock_t t_lock_flush; /* for lock_mutex_flush() impl */ 193 struct _disp *t_disp_queue; /* run queue for chosen CPU */ 194 clock_t t_disp_time; /* last time this thread was running */ 195 uint_t t_kpri_req; /* kernel priority required */ 196 197 /* 198 * Post-syscall / post-trap flags. 199 * No lock is required to set these. 200 * These must be cleared only by the thread itself. 201 * 202 * t_astflag indicates that some post-trap processing is required, 203 * possibly a signal or a preemption. The thread will not 204 * return to user with this set. 205 * t_post_sys indicates that some unusualy post-system call 206 * handling is required, such as an error or tracing. 207 * t_sig_check indicates that some condition in ISSIG() must be 208 * checked, but doesn't prevent returning to user. 209 * t_post_sys_ast is a way of checking whether any of these three 210 * flags are set. 211 */ 212 union __tu { 213 struct __ts { 214 volatile char _t_astflag; /* AST requested */ 215 volatile char _t_sig_check; /* ISSIG required */ 216 volatile char _t_post_sys; /* post_syscall req */ 217 volatile char _t_trapret; /* call CL_TRAPRET */ 218 } _ts; 219 volatile int _t_post_sys_ast; /* OR of these flags */ 220 } _tu; 221 #define t_astflag _tu._ts._t_astflag 222 #define t_sig_check _tu._ts._t_sig_check 223 #define t_post_sys _tu._ts._t_post_sys 224 #define t_trapret _tu._ts._t_trapret 225 #define t_post_sys_ast _tu._t_post_sys_ast 226 227 /* 228 * Real time microstate profiling. 229 */ 230 /* possible 4-byte filler */ 231 hrtime_t t_waitrq; /* timestamp for run queue wait time */ 232 int t_mstate; /* current microstate */ 233 struct rprof { 234 int rp_anystate; /* set if any state non-zero */ 235 uint_t rp_state[NMSTATES]; /* mstate profiling counts */ 236 } *t_rprof; 237 238 /* 239 * There is a turnstile inserted into the list below for 240 * every priority inverted synchronization object that 241 * this thread holds. 242 */ 243 244 struct turnstile *t_prioinv; 245 246 /* 247 * Pointer to the turnstile attached to the synchronization 248 * object where this thread is blocked. 249 */ 250 251 struct turnstile *t_ts; 252 253 /* 254 * kernel thread specific data 255 * Borrowed from userland implementation of POSIX tsd 256 */ 257 struct tsd_thread { 258 struct tsd_thread *ts_next; /* threads with TSD */ 259 struct tsd_thread *ts_prev; /* threads with TSD */ 260 uint_t ts_nkeys; /* entries in value array */ 261 void **ts_value; /* array of value/key */ 262 } *t_tsd; 263 264 clock_t t_stime; /* time stamp used by the swapper */ 265 struct door_data *t_door; /* door invocation data */ 266 kmutex_t *t_plockp; /* pointer to process's p_lock */ 267 268 struct sc_shared *t_schedctl; /* scheduler activations shared data */ 269 uintptr_t t_sc_uaddr; /* user-level address of shared data */ 270 271 struct cpupart *t_cpupart; /* partition containing thread */ 272 int t_bind_pset; /* processor set binding */ 273 274 struct copyops *t_copyops; /* copy in/out ops vector */ 275 276 caddr_t t_stkbase; /* base of the the stack */ 277 struct page *t_red_pp; /* if non-NULL, redzone is mapped */ 278 279 struct _afd t_activefd; /* active file descriptor table */ 280 281 struct _kthread *t_priforw; /* sleepq per-priority sublist */ 282 struct _kthread *t_priback; 283 284 struct sleepq *t_sleepq; /* sleep queue thread is waiting on */ 285 struct trap_info *t_panic_trap; /* saved data from fatal trap */ 286 int *t_lgrp_affinity; /* lgroup affinity */ 287 struct upimutex *t_upimutex; /* list of upimutexes owned by thread */ 288 uint32_t t_nupinest; /* number of nested held upi mutexes */ 289 struct kproject *t_proj; /* project containing this thread */ 290 uint8_t t_unpark; /* modified holding t_delay_lock */ 291 uint8_t t_release; /* lwp_release() waked up the thread */ 292 uint8_t t_hatdepth; /* depth of recursive hat_memloads */ 293 kcondvar_t t_joincv; /* cv used to wait for thread exit */ 294 void *t_taskq; /* for threads belonging to taskq */ 295 hrtime_t t_anttime; /* most recent time anticipatory load */ 296 /* was added to an lgroup's load */ 297 /* on this thread's behalf */ 298 char *t_pdmsg; /* privilege debugging message */ 299 300 uint_t t_predcache; /* DTrace predicate cache */ 301 hrtime_t t_dtrace_vtime; /* DTrace virtual time */ 302 hrtime_t t_dtrace_start; /* DTrace slice start time */ 303 304 uint8_t t_dtrace_stop; /* indicates a DTrace-desired stop */ 305 uint8_t t_dtrace_sig; /* signal sent via DTrace's raise() */ 306 307 union __tdu { 308 struct __tds { 309 uint8_t _t_dtrace_on; /* hit a fasttrap tracepoint */ 310 uint8_t _t_dtrace_step; /* about to return to kernel */ 311 uint8_t _t_dtrace_ret; /* handling a return probe */ 312 uint8_t _t_dtrace_ast; /* saved ast flag */ 313 #ifdef __amd64 314 uint8_t _t_dtrace_reg; /* modified register */ 315 #endif 316 } _tds; 317 ulong_t _t_dtrace_ft; /* bitwise or of these flags */ 318 } _tdu; 319 #define t_dtrace_ft _tdu._t_dtrace_ft 320 #define t_dtrace_on _tdu._tds._t_dtrace_on 321 #define t_dtrace_step _tdu._tds._t_dtrace_step 322 #define t_dtrace_ret _tdu._tds._t_dtrace_ret 323 #define t_dtrace_ast _tdu._tds._t_dtrace_ast 324 #ifdef __amd64 325 #define t_dtrace_reg _tdu._tds._t_dtrace_reg 326 #endif 327 328 uintptr_t t_dtrace_pc; /* DTrace saved pc from fasttrap */ 329 uintptr_t t_dtrace_npc; /* DTrace next pc from fasttrap */ 330 uintptr_t t_dtrace_scrpc; /* DTrace per-thread scratch location */ 331 uintptr_t t_dtrace_astpc; /* DTrace return sequence location */ 332 #ifdef __amd64 333 uint64_t t_dtrace_regv; /* DTrace saved reg from fasttrap */ 334 #endif 335 hrtime_t t_hrtime; /* high-res last time on cpu */ 336 } kthread_t; 337 338 /* 339 * Thread flag (t_flag) definitions. 340 * These flags must be changed only for the current thread, 341 * and not during preemption code, since the code being 342 * preempted could be modifying the flags. 343 * 344 * For the most part these flags do not need locking. 345 * The following flags will only be changed while the thread_lock is held, 346 * to give assurrance that they are consistent with t_state: 347 * T_WAKEABLE 348 */ 349 #define T_INTR_THREAD 0x0001 /* thread is an interrupt thread */ 350 #define T_WAKEABLE 0x0002 /* thread is blocked, signals enabled */ 351 #define T_TOMASK 0x0004 /* use lwp_sigoldmask on return from signal */ 352 #define T_TALLOCSTK 0x0008 /* thread structure allocated from stk */ 353 #define T_WOULDBLOCK 0x0020 /* for lockfs */ 354 #define T_DONTBLOCK 0x0040 /* for lockfs */ 355 #define T_DONTPEND 0x0080 /* for lockfs */ 356 #define T_SYS_PROF 0x0100 /* profiling on for duration of system call */ 357 #define T_WAITCVSEM 0x0200 /* waiting for a lwp_cv or lwp_sema on sleepq */ 358 #define T_WATCHPT 0x0400 /* thread undergoing a watchpoint emulation */ 359 #define T_PANIC 0x0800 /* thread initiated a system panic */ 360 #define T_DFLTSTK 0x1000 /* stack is default size */ 361 362 /* 363 * Flags in t_proc_flag. 364 * These flags must be modified only when holding the p_lock 365 * for the associated process. 366 */ 367 #define TP_DAEMON 0x0001 /* this is an LWP_DAEMON lwp */ 368 #define TP_HOLDLWP 0x0002 /* hold thread's lwp */ 369 #define TP_TWAIT 0x0004 /* wait to be freed by lwp_wait() */ 370 #define TP_LWPEXIT 0x0008 /* lwp has exited */ 371 #define TP_PRSTOP 0x0010 /* thread is being stopped via /proc */ 372 #define TP_CHKPT 0x0020 /* thread is being stopped via CPR checkpoint */ 373 #define TP_EXITLWP 0x0040 /* terminate this lwp */ 374 #define TP_PRVSTOP 0x0080 /* thread is virtually stopped via /proc */ 375 #define TP_MSACCT 0x0100 /* collect micro-state accounting information */ 376 #define TP_STOPPING 0x0200 /* thread is executing stop() */ 377 #define TP_WATCHPT 0x0400 /* process has watchpoints in effect */ 378 #define TP_PAUSE 0x0800 /* process is being stopped via pauselwps() */ 379 #define TP_CHANGEBIND 0x1000 /* thread has a new cpu/cpupart binding */ 380 #define TP_ZTHREAD 0x2000 /* this is a kernel thread for a zone */ 381 #define TP_WATCHSTOP 0x4000 /* thread is stopping via holdwatch() */ 382 383 /* 384 * Thread scheduler flag (t_schedflag) definitions. 385 * The thread must be locked via thread_lock() or equiv. to change these. 386 */ 387 #define TS_LOAD 0x0001 /* thread is in memory */ 388 #define TS_DONT_SWAP 0x0002 /* thread/lwp should not be swapped */ 389 #define TS_SWAPENQ 0x0004 /* swap thread when it reaches a safe point */ 390 #define TS_ON_SWAPQ 0x0008 /* thread is on the swap queue */ 391 #define TS_SIGNALLED 0x0010 /* thread was awakened by cv_signal() */ 392 #define TS_CSTART 0x0100 /* setrun() by continuelwps() */ 393 #define TS_UNPAUSE 0x0200 /* setrun() by unpauselwps() */ 394 #define TS_XSTART 0x0400 /* setrun() by SIGCONT */ 395 #define TS_PSTART 0x0800 /* setrun() by /proc */ 396 #define TS_RESUME 0x1000 /* setrun() by CPR resume process */ 397 #define TS_CREATE 0x2000 /* setrun() by syslwp_create() */ 398 #define TS_RUNQMATCH 0x4000 /* exact run queue balancing by setbackdq() */ 399 #define TS_ALLSTART \ 400 (TS_CSTART|TS_UNPAUSE|TS_XSTART|TS_PSTART|TS_RESUME|TS_CREATE) 401 402 /* 403 * No locking needed for AST field. 404 */ 405 #define aston(t) ((t)->t_astflag = 1) 406 #define astoff(t) ((t)->t_astflag = 0) 407 408 /* True if thread is stopped on an event of interest */ 409 #define ISTOPPED(t) ((t)->t_state == TS_STOPPED && \ 410 !((t)->t_schedflag & TS_PSTART)) 411 412 /* similar to ISTOPPED except the event of interest is CPR */ 413 #define CPR_ISTOPPED(t) ((t)->t_state == TS_STOPPED && \ 414 !((t)->t_schedflag & TS_RESUME)) 415 416 /* 417 * True if thread is virtually stopped (is or was asleep in 418 * one of the lwp_*() system calls and marked to stop by /proc.) 419 */ 420 #define VSTOPPED(t) ((t)->t_proc_flag & TP_PRVSTOP) 421 422 /* similar to VSTOPPED except the point of interest is CPR */ 423 #define CPR_VSTOPPED(t) \ 424 ((t)->t_state == TS_SLEEP && \ 425 (t)->t_wchan0 != NULL && \ 426 ((t)->t_flag & T_WAKEABLE) && \ 427 ((t)->t_proc_flag & TP_CHKPT)) 428 429 /* True if thread has been stopped by hold*() or was created stopped */ 430 #define SUSPENDED(t) ((t)->t_state == TS_STOPPED && \ 431 ((t)->t_schedflag & (TS_CSTART|TS_UNPAUSE)) != (TS_CSTART|TS_UNPAUSE)) 432 433 /* True if thread possesses an inherited priority */ 434 #define INHERITED(t) ((t)->t_epri != 0) 435 436 /* The dispatch priority of a thread */ 437 #define DISP_PRIO(t) ((t)->t_epri > (t)->t_pri ? (t)->t_epri : (t)->t_pri) 438 439 /* The assigned priority of a thread */ 440 #define ASSIGNED_PRIO(t) ((t)->t_pri) 441 442 /* 443 * Macros to determine whether a thread can be swapped. 444 * If t_lock is held, the thread is either on a processor or being swapped. 445 */ 446 #define SWAP_OK(t) (!LOCK_HELD(&(t)->t_lock)) 447 448 /* 449 * proctot(x) 450 * convert a proc pointer to a thread pointer. this only works with 451 * procs that have only one lwp. 452 * 453 * proctolwp(x) 454 * convert a proc pointer to a lwp pointer. this only works with 455 * procs that have only one lwp. 456 * 457 * ttolwp(x) 458 * convert a thread pointer to its lwp pointer. 459 * 460 * ttoproc(x) 461 * convert a thread pointer to its proc pointer. 462 * 463 * ttoproj(x) 464 * convert a thread pointer to its project pointer. 465 * 466 * lwptot(x) 467 * convert a lwp pointer to its thread pointer. 468 * 469 * lwptoproc(x) 470 * convert a lwp to its proc pointer. 471 */ 472 #define proctot(x) ((x)->p_tlist) 473 #define proctolwp(x) ((x)->p_tlist->t_lwp) 474 #define ttolwp(x) ((x)->t_lwp) 475 #define ttoproc(x) ((x)->t_procp) 476 #define ttoproj(x) ((x)->t_proj) 477 #define lwptot(x) ((x)->lwp_thread) 478 #define lwptoproc(x) ((x)->lwp_procp) 479 480 #define t_pc t_pcb.val[0] 481 #define t_sp t_pcb.val[1] 482 483 #ifdef _KERNEL 484 485 extern kthread_t *threadp(void); /* inline, returns thread pointer */ 486 #define curthread (threadp()) /* current thread pointer */ 487 #define curproc (ttoproc(curthread)) /* current process pointer */ 488 #define curproj (ttoproj(curthread)) /* current project pointer */ 489 490 extern struct _kthread t0; /* the scheduler thread */ 491 extern kmutex_t pidlock; /* global process lock */ 492 493 /* 494 * thread_free_lock is used by the clock thread to keep a thread 495 * from being freed while it is being examined. 496 */ 497 extern kmutex_t thread_free_lock; 498 499 /* 500 * Routines to change the priority and effective priority 501 * of a thread-locked thread, whatever its state. 502 */ 503 extern int thread_change_pri(kthread_t *t, pri_t disp_pri, int front); 504 extern void thread_change_epri(kthread_t *t, pri_t disp_pri); 505 506 /* 507 * Routines that manipulate the dispatcher lock for the thread. 508 * The locking heirarchy is as follows: 509 * cpu_lock > sleepq locks > run queue locks 510 */ 511 void thread_transition(kthread_t *); /* move to transition lock */ 512 void thread_stop(kthread_t *); /* move to stop lock */ 513 void thread_lock(kthread_t *); /* lock thread and its queue */ 514 void thread_lock_high(kthread_t *); /* lock thread and its queue */ 515 void thread_onproc(kthread_t *, struct cpu *); /* set onproc state lock */ 516 517 #define thread_unlock(t) disp_lock_exit((t)->t_lockp) 518 #define thread_unlock_high(t) disp_lock_exit_high((t)->t_lockp) 519 #define thread_unlock_nopreempt(t) disp_lock_exit_nopreempt((t)->t_lockp) 520 521 #define THREAD_LOCK_HELD(t) (DISP_LOCK_HELD((t)->t_lockp)) 522 523 extern disp_lock_t transition_lock; /* lock protecting transiting threads */ 524 extern disp_lock_t stop_lock; /* lock protecting stopped threads */ 525 526 caddr_t thread_stk_init(caddr_t); /* init thread stack */ 527 528 #endif /* _KERNEL */ 529 530 /* 531 * Macros to indicate that the thread holds resources that could be critical 532 * to other kernel threads, so this thread needs to have kernel priority 533 * if it blocks or is preempted. Note that this is not necessary if the 534 * resource is a mutex or a writer lock because of priority inheritance. 535 * 536 * The only way one thread may legally manipulate another thread's t_kpri_req 537 * is to hold the target thread's thread lock while that thread is asleep. 538 * (The rwlock code does this to implement direct handoff to waiting readers.) 539 */ 540 #define THREAD_KPRI_REQUEST() (curthread->t_kpri_req++) 541 #define THREAD_KPRI_RELEASE() (curthread->t_kpri_req--) 542 #define THREAD_KPRI_RELEASE_N(n) (curthread->t_kpri_req -= (n)) 543 544 /* 545 * Macro to change a thread's priority. 546 */ 547 #define THREAD_CHANGE_PRI(t, pri) { \ 548 pri_t __new_pri = (pri); \ 549 DTRACE_SCHED2(change__pri, kthread_t *, (t), pri_t, __new_pri); \ 550 (t)->t_pri = __new_pri; \ 551 } 552 553 /* 554 * Macro to indicate that a thread's priority is about to be changed. 555 */ 556 #define THREAD_WILLCHANGE_PRI(t, pri) { \ 557 DTRACE_SCHED2(change__pri, kthread_t *, (t), pri_t, (pri)); \ 558 } 559 560 /* 561 * Macros to change thread state and the associated lock. 562 */ 563 #define THREAD_SET_STATE(tp, state, lp) \ 564 ((tp)->t_state = state, (tp)->t_lockp = lp) 565 566 /* 567 * Point it at the transition lock, which is always held. 568 * The previosly held lock is dropped. 569 */ 570 #define THREAD_TRANSITION(tp) thread_transition(tp); 571 /* 572 * Set the thread's lock to be the transition lock, without dropping 573 * previosly held lock. 574 */ 575 #define THREAD_TRANSITION_NOLOCK(tp) ((tp)->t_lockp = &transition_lock) 576 577 /* 578 * Put thread in run state, and set the lock pointer to the dispatcher queue 579 * lock pointer provided. This lock should be held. 580 */ 581 #define THREAD_RUN(tp, lp) THREAD_SET_STATE(tp, TS_RUN, lp) 582 583 /* 584 * Put thread in run state, and set the lock pointer to the dispatcher queue 585 * lock pointer provided (i.e., the "swapped_lock"). This lock should be held. 586 */ 587 #define THREAD_SWAP(tp, lp) THREAD_SET_STATE(tp, TS_RUN, lp) 588 589 /* 590 * Put the thread in zombie state and set the lock pointer to NULL. 591 * The NULL will catch anything that tries to lock a zombie. 592 */ 593 #define THREAD_ZOMB(tp) THREAD_SET_STATE(tp, TS_ZOMB, NULL) 594 595 /* 596 * Set the thread into ONPROC state, and point the lock at the CPUs 597 * lock for the onproc thread(s). This lock should be held, so the 598 * thread deoes not become unlocked, since these stores can be reordered. 599 */ 600 #define THREAD_ONPROC(tp, cpu) \ 601 THREAD_SET_STATE(tp, TS_ONPROC, &(cpu)->cpu_thread_lock) 602 603 /* 604 * Set the thread into the TS_SLEEP state, and set the lock pointer to 605 * to some sleep queue's lock. The new lock should already be held. 606 */ 607 #define THREAD_SLEEP(tp, lp) { \ 608 disp_lock_t *tlp; \ 609 tlp = (tp)->t_lockp; \ 610 THREAD_SET_STATE(tp, TS_SLEEP, lp); \ 611 disp_lock_exit_high(tlp); \ 612 } 613 614 /* 615 * Interrupt threads are created in TS_FREE state, and their lock 616 * points at the associated CPU's lock. 617 */ 618 #define THREAD_FREEINTR(tp, cpu) \ 619 THREAD_SET_STATE(tp, TS_FREE, &(cpu)->cpu_thread_lock) 620 621 622 #ifdef __cplusplus 623 } 624 #endif 625 626 #endif /* _SYS_THREAD_H */ 627