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 2008 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 31 #include <sys/types.h> 32 #include <sys/t_lock.h> 33 #include <sys/klwp.h> 34 #include <sys/time.h> 35 #include <sys/signal.h> 36 #include <sys/kcpc.h> 37 #if defined(__GNUC__) && defined(_ASM_INLINES) && defined(_KERNEL) 38 #include <asm/thread.h> 39 #endif 40 41 #ifdef __cplusplus 42 extern "C" { 43 #endif 44 45 /* 46 * The thread object, its states, and the methods by which it 47 * is accessed. 48 */ 49 50 /* 51 * Values that t_state may assume. Note that t_state cannot have more 52 * than one of these flags set at a time. 53 */ 54 #define TS_FREE 0x00 /* Thread at loose ends */ 55 #define TS_SLEEP 0x01 /* Awaiting an event */ 56 #define TS_RUN 0x02 /* Runnable, but not yet on a processor */ 57 #define TS_ONPROC 0x04 /* Thread is being run on a processor */ 58 #define TS_ZOMB 0x08 /* Thread has died but hasn't been reaped */ 59 #define TS_STOPPED 0x10 /* Stopped, initial state */ 60 #define TS_WAIT 0x20 /* Waiting to become runnable */ 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 panic_trap_info; 99 struct upimutex; 100 struct kproject; 101 struct on_trap_data; 102 struct waitq; 103 struct _kcpc_ctx; 104 struct _kcpc_set; 105 106 /* Definition for kernel thread identifier type */ 107 typedef uint64_t kt_did_t; 108 109 typedef struct _kthread { 110 struct _kthread *t_link; /* dispq, sleepq, and free queue link */ 111 112 caddr_t t_stk; /* base of stack (kernel sp value to use) */ 113 void (*t_startpc)(void); /* PC where thread started */ 114 struct cpu *t_bound_cpu; /* cpu bound to, or NULL if not bound */ 115 short t_affinitycnt; /* nesting level of kernel affinity-setting */ 116 short t_bind_cpu; /* user-specified CPU binding (-1 if none) */ 117 ushort_t t_flag; /* modified only by current thread */ 118 ushort_t t_proc_flag; /* modified holding ttproc(t)->p_lock */ 119 ushort_t t_schedflag; /* modified holding thread_lock(t) */ 120 volatile char t_preempt; /* don't preempt thread if set */ 121 volatile char t_preempt_lk; 122 uint_t t_state; /* thread state (protected by thread_lock) */ 123 pri_t t_pri; /* assigned thread priority */ 124 pri_t t_epri; /* inherited thread priority */ 125 pri_t t_cpri; /* thread scheduling class priority */ 126 char t_writer; /* sleeping in lwp_rwlock_lock(RW_WRITE_LOCK) */ 127 uchar_t t_bindflag; /* CPU and pset binding type */ 128 label_t t_pcb; /* pcb, save area when switching */ 129 lwpchan_t t_lwpchan; /* reason for blocking */ 130 #define t_wchan0 t_lwpchan.lc_wchan0 131 #define t_wchan t_lwpchan.lc_wchan 132 struct _sobj_ops *t_sobj_ops; 133 id_t t_cid; /* scheduling class id */ 134 struct thread_ops *t_clfuncs; /* scheduling class ops vector */ 135 void *t_cldata; /* per scheduling class specific data */ 136 ctxop_t *t_ctx; /* thread context */ 137 uintptr_t t_lofault; /* ret pc for failed page faults */ 138 label_t *t_onfault; /* on_fault() setjmp buf */ 139 struct on_trap_data *t_ontrap; /* on_trap() protection data */ 140 caddr_t t_swap; /* swappable thread storage */ 141 lock_t t_lock; /* used to resume() a thread */ 142 uint8_t t_lockstat; /* set while thread is in lockstat code */ 143 uint8_t t_pil; /* interrupt thread PIL */ 144 disp_lock_t t_pi_lock; /* lock protecting t_prioinv list */ 145 char t_nomigrate; /* do not migrate if set */ 146 struct cpu *t_cpu; /* CPU that thread last ran on */ 147 struct cpu *t_weakbound_cpu; /* cpu weakly bound to */ 148 struct lgrp_ld *t_lpl; /* load average for home lgroup */ 149 void *t_lgrp_reserv[2]; /* reserved for future */ 150 struct _kthread *t_intr; /* interrupted (pinned) thread */ 151 uint64_t t_intr_start; /* timestamp when time slice began */ 152 kt_did_t t_did; /* thread id for kernel debuggers */ 153 caddr_t t_tnf_tpdp; /* Trace facility data pointer */ 154 struct _kcpc_ctx *t_cpc_ctx; /* performance counter context */ 155 struct _kcpc_set *t_cpc_set; /* set this thread has bound */ 156 157 /* 158 * non swappable part of the lwp state. 159 */ 160 id_t t_tid; /* lwp's id */ 161 id_t t_waitfor; /* target lwp id in lwp_wait() */ 162 struct sigqueue *t_sigqueue; /* queue of siginfo structs */ 163 k_sigset_t t_sig; /* signals pending to this process */ 164 k_sigset_t t_extsig; /* signals sent from another contract */ 165 k_sigset_t t_hold; /* hold signal bit mask */ 166 struct _kthread *t_forw; /* process's forward thread link */ 167 struct _kthread *t_back; /* process's backward thread link */ 168 struct _kthread *t_thlink; /* tid (lwpid) lookup hash link */ 169 klwp_t *t_lwp; /* thread's lwp pointer */ 170 struct proc *t_procp; /* proc pointer */ 171 struct t_audit_data *t_audit_data; /* per thread audit data */ 172 struct _kthread *t_next; /* doubly linked list of all threads */ 173 struct _kthread *t_prev; 174 ushort_t t_whystop; /* reason for stopping */ 175 ushort_t t_whatstop; /* more detailed reason */ 176 int t_dslot; /* index in proc's thread directory */ 177 struct pollstate *t_pollstate; /* state used during poll(2) */ 178 struct pollcache *t_pollcache; /* to pass a pcache ptr by /dev/poll */ 179 struct cred *t_cred; /* pointer to current cred */ 180 time_t t_start; /* start time, seconds since epoch */ 181 clock_t t_lbolt; /* lbolt at last clock_tick() */ 182 hrtime_t t_stoptime; /* timestamp at stop() */ 183 uint_t t_pctcpu; /* %cpu at last clock_tick(), binary */ 184 /* point at right of high-order bit */ 185 short t_sysnum; /* system call number */ 186 kcondvar_t t_delay_cv; 187 kmutex_t t_delay_lock; 188 189 /* 190 * Pointer to the dispatcher lock protecting t_state and state-related 191 * flags. This pointer can change during waits on the lock, so 192 * it should be grabbed only by thread_lock(). 193 */ 194 disp_lock_t *t_lockp; /* pointer to the dispatcher lock */ 195 ushort_t t_oldspl; /* spl level before dispatcher locked */ 196 volatile char t_pre_sys; /* pre-syscall work needed */ 197 lock_t t_lock_flush; /* for lock_mutex_flush() impl */ 198 struct _disp *t_disp_queue; /* run queue for chosen CPU */ 199 clock_t t_disp_time; /* last time this thread was running */ 200 uint_t t_kpri_req; /* kernel priority required */ 201 202 /* 203 * Post-syscall / post-trap flags. 204 * No lock is required to set these. 205 * These must be cleared only by the thread itself. 206 * 207 * t_astflag indicates that some post-trap processing is required, 208 * possibly a signal or a preemption. The thread will not 209 * return to user with this set. 210 * t_post_sys indicates that some unusualy post-system call 211 * handling is required, such as an error or tracing. 212 * t_sig_check indicates that some condition in ISSIG() must be 213 * checked, but doesn't prevent returning to user. 214 * t_post_sys_ast is a way of checking whether any of these three 215 * flags are set. 216 */ 217 union __tu { 218 struct __ts { 219 volatile char _t_astflag; /* AST requested */ 220 volatile char _t_sig_check; /* ISSIG required */ 221 volatile char _t_post_sys; /* post_syscall req */ 222 volatile char _t_trapret; /* call CL_TRAPRET */ 223 } _ts; 224 volatile int _t_post_sys_ast; /* OR of these flags */ 225 } _tu; 226 #define t_astflag _tu._ts._t_astflag 227 #define t_sig_check _tu._ts._t_sig_check 228 #define t_post_sys _tu._ts._t_post_sys 229 #define t_trapret _tu._ts._t_trapret 230 #define t_post_sys_ast _tu._t_post_sys_ast 231 232 /* 233 * Real time microstate profiling. 234 */ 235 /* possible 4-byte filler */ 236 hrtime_t t_waitrq; /* timestamp for run queue wait time */ 237 int t_mstate; /* current microstate */ 238 struct rprof { 239 int rp_anystate; /* set if any state non-zero */ 240 uint_t rp_state[NMSTATES]; /* mstate profiling counts */ 241 } *t_rprof; 242 243 /* 244 * There is a turnstile inserted into the list below for 245 * every priority inverted synchronization object that 246 * this thread holds. 247 */ 248 249 struct turnstile *t_prioinv; 250 251 /* 252 * Pointer to the turnstile attached to the synchronization 253 * object where this thread is blocked. 254 */ 255 256 struct turnstile *t_ts; 257 258 /* 259 * kernel thread specific data 260 * Borrowed from userland implementation of POSIX tsd 261 */ 262 struct tsd_thread { 263 struct tsd_thread *ts_next; /* threads with TSD */ 264 struct tsd_thread *ts_prev; /* threads with TSD */ 265 uint_t ts_nkeys; /* entries in value array */ 266 void **ts_value; /* array of value/key */ 267 } *t_tsd; 268 269 clock_t t_stime; /* time stamp used by the swapper */ 270 struct door_data *t_door; /* door invocation data */ 271 kmutex_t *t_plockp; /* pointer to process's p_lock */ 272 273 struct sc_shared *t_schedctl; /* scheduler activations shared data */ 274 uintptr_t t_sc_uaddr; /* user-level address of shared data */ 275 276 struct cpupart *t_cpupart; /* partition containing thread */ 277 int t_bind_pset; /* processor set binding */ 278 279 struct copyops *t_copyops; /* copy in/out ops vector */ 280 281 caddr_t t_stkbase; /* base of the the stack */ 282 struct page *t_red_pp; /* if non-NULL, redzone is mapped */ 283 284 struct _afd t_activefd; /* active file descriptor table */ 285 286 struct _kthread *t_priforw; /* sleepq per-priority sublist */ 287 struct _kthread *t_priback; 288 289 struct sleepq *t_sleepq; /* sleep queue thread is waiting on */ 290 struct panic_trap_info *t_panic_trap; /* saved data from fatal trap */ 291 int *t_lgrp_affinity; /* lgroup affinity */ 292 struct upimutex *t_upimutex; /* list of upimutexes owned by thread */ 293 uint32_t t_nupinest; /* number of nested held upi mutexes */ 294 struct kproject *t_proj; /* project containing this thread */ 295 uint8_t t_unpark; /* modified holding t_delay_lock */ 296 uint8_t t_release; /* lwp_release() waked up the thread */ 297 uint8_t t_hatdepth; /* depth of recursive hat_memloads */ 298 uint8_t t_xpvcntr; /* see xen_block_migrate() */ 299 kcondvar_t t_joincv; /* cv used to wait for thread exit */ 300 void *t_taskq; /* for threads belonging to taskq */ 301 hrtime_t t_anttime; /* most recent time anticipatory load */ 302 /* was added to an lgroup's load */ 303 /* on this thread's behalf */ 304 char *t_pdmsg; /* privilege debugging message */ 305 306 uint_t t_predcache; /* DTrace predicate cache */ 307 hrtime_t t_dtrace_vtime; /* DTrace virtual time */ 308 hrtime_t t_dtrace_start; /* DTrace slice start time */ 309 310 uint8_t t_dtrace_stop; /* indicates a DTrace-desired stop */ 311 uint8_t t_dtrace_sig; /* signal sent via DTrace's raise() */ 312 313 union __tdu { 314 struct __tds { 315 uint8_t _t_dtrace_on; /* hit a fasttrap tracepoint */ 316 uint8_t _t_dtrace_step; /* about to return to kernel */ 317 uint8_t _t_dtrace_ret; /* handling a return probe */ 318 uint8_t _t_dtrace_ast; /* saved ast flag */ 319 #ifdef __amd64 320 uint8_t _t_dtrace_reg; /* modified register */ 321 #endif 322 } _tds; 323 ulong_t _t_dtrace_ft; /* bitwise or of these flags */ 324 } _tdu; 325 #define t_dtrace_ft _tdu._t_dtrace_ft 326 #define t_dtrace_on _tdu._tds._t_dtrace_on 327 #define t_dtrace_step _tdu._tds._t_dtrace_step 328 #define t_dtrace_ret _tdu._tds._t_dtrace_ret 329 #define t_dtrace_ast _tdu._tds._t_dtrace_ast 330 #ifdef __amd64 331 #define t_dtrace_reg _tdu._tds._t_dtrace_reg 332 #endif 333 334 uintptr_t t_dtrace_pc; /* DTrace saved pc from fasttrap */ 335 uintptr_t t_dtrace_npc; /* DTrace next pc from fasttrap */ 336 uintptr_t t_dtrace_scrpc; /* DTrace per-thread scratch location */ 337 uintptr_t t_dtrace_astpc; /* DTrace return sequence location */ 338 #ifdef __amd64 339 uint64_t t_dtrace_regv; /* DTrace saved reg from fasttrap */ 340 #endif 341 hrtime_t t_hrtime; /* high-res last time on cpu */ 342 kmutex_t t_ctx_lock; /* protects t_ctx in removectx() */ 343 struct waitq *t_waitq; /* wait queue */ 344 } kthread_t; 345 346 /* 347 * Thread flag (t_flag) definitions. 348 * These flags must be changed only for the current thread, 349 * and not during preemption code, since the code being 350 * preempted could be modifying the flags. 351 * 352 * For the most part these flags do not need locking. 353 * The following flags will only be changed while the thread_lock is held, 354 * to give assurrance that they are consistent with t_state: 355 * T_WAKEABLE 356 */ 357 #define T_INTR_THREAD 0x0001 /* thread is an interrupt thread */ 358 #define T_WAKEABLE 0x0002 /* thread is blocked, signals enabled */ 359 #define T_TOMASK 0x0004 /* use lwp_sigoldmask on return from signal */ 360 #define T_TALLOCSTK 0x0008 /* thread structure allocated from stk */ 361 #define T_FORKALL 0x0010 /* thread was cloned by forkall() */ 362 #define T_WOULDBLOCK 0x0020 /* for lockfs */ 363 #define T_DONTBLOCK 0x0040 /* for lockfs */ 364 #define T_DONTPEND 0x0080 /* for lockfs */ 365 #define T_SYS_PROF 0x0100 /* profiling on for duration of system call */ 366 #define T_WAITCVSEM 0x0200 /* waiting for a lwp_cv or lwp_sema on sleepq */ 367 #define T_WATCHPT 0x0400 /* thread undergoing a watchpoint emulation */ 368 #define T_PANIC 0x0800 /* thread initiated a system panic */ 369 #define T_DFLTSTK 0x1000 /* stack is default size */ 370 #define T_CAPTURING 0x2000 /* thread is in page capture logic */ 371 #define T_VFPARENT 0x4000 /* thread is vfork parent, must call vfwait */ 372 #define T_DONTDTRACE 0x8000 /* disable DTrace probes */ 373 374 /* 375 * Flags in t_proc_flag. 376 * These flags must be modified only when holding the p_lock 377 * for the associated process. 378 */ 379 #define TP_DAEMON 0x0001 /* this is an LWP_DAEMON lwp */ 380 #define TP_HOLDLWP 0x0002 /* hold thread's lwp */ 381 #define TP_TWAIT 0x0004 /* wait to be freed by lwp_wait() */ 382 #define TP_LWPEXIT 0x0008 /* lwp has exited */ 383 #define TP_PRSTOP 0x0010 /* thread is being stopped via /proc */ 384 #define TP_CHKPT 0x0020 /* thread is being stopped via CPR checkpoint */ 385 #define TP_EXITLWP 0x0040 /* terminate this lwp */ 386 #define TP_PRVSTOP 0x0080 /* thread is virtually stopped via /proc */ 387 #define TP_MSACCT 0x0100 /* collect micro-state accounting information */ 388 #define TP_STOPPING 0x0200 /* thread is executing stop() */ 389 #define TP_WATCHPT 0x0400 /* process has watchpoints in effect */ 390 #define TP_PAUSE 0x0800 /* process is being stopped via pauselwps() */ 391 #define TP_CHANGEBIND 0x1000 /* thread has a new cpu/cpupart binding */ 392 #define TP_ZTHREAD 0x2000 /* this is a kernel thread for a zone */ 393 #define TP_WATCHSTOP 0x4000 /* thread is stopping via holdwatch() */ 394 395 /* 396 * Thread scheduler flag (t_schedflag) definitions. 397 * The thread must be locked via thread_lock() or equiv. to change these. 398 */ 399 #define TS_LOAD 0x0001 /* thread is in memory */ 400 #define TS_DONT_SWAP 0x0002 /* thread/lwp should not be swapped */ 401 #define TS_SWAPENQ 0x0004 /* swap thread when it reaches a safe point */ 402 #define TS_ON_SWAPQ 0x0008 /* thread is on the swap queue */ 403 #define TS_SIGNALLED 0x0010 /* thread was awakened by cv_signal() */ 404 #define TS_PROJWAITQ 0x0020 /* thread is on its project's waitq */ 405 #define TS_ZONEWAITQ 0x0040 /* thread is on its zone's waitq */ 406 #define TS_CSTART 0x0100 /* setrun() by continuelwps() */ 407 #define TS_UNPAUSE 0x0200 /* setrun() by unpauselwps() */ 408 #define TS_XSTART 0x0400 /* setrun() by SIGCONT */ 409 #define TS_PSTART 0x0800 /* setrun() by /proc */ 410 #define TS_RESUME 0x1000 /* setrun() by CPR resume process */ 411 #define TS_CREATE 0x2000 /* setrun() by syslwp_create() */ 412 #define TS_RUNQMATCH 0x4000 /* exact run queue balancing by setbackdq() */ 413 #define TS_ALLSTART \ 414 (TS_CSTART|TS_UNPAUSE|TS_XSTART|TS_PSTART|TS_RESUME|TS_CREATE) 415 #define TS_ANYWAITQ (TS_PROJWAITQ|TS_ZONEWAITQ) 416 417 /* 418 * Thread binding types 419 */ 420 #define TB_ALLHARD 0 421 #define TB_CPU_SOFT 0x01 /* soft binding to CPU */ 422 #define TB_PSET_SOFT 0x02 /* soft binding to pset */ 423 424 #define TB_CPU_SOFT_SET(t) ((t)->t_bindflag |= TB_CPU_SOFT) 425 #define TB_CPU_HARD_SET(t) ((t)->t_bindflag &= ~TB_CPU_SOFT) 426 #define TB_PSET_SOFT_SET(t) ((t)->t_bindflag |= TB_PSET_SOFT) 427 #define TB_PSET_HARD_SET(t) ((t)->t_bindflag &= ~TB_PSET_SOFT) 428 #define TB_CPU_IS_SOFT(t) ((t)->t_bindflag & TB_CPU_SOFT) 429 #define TB_CPU_IS_HARD(t) (!TB_CPU_IS_SOFT(t)) 430 #define TB_PSET_IS_SOFT(t) ((t)->t_bindflag & TB_PSET_SOFT) 431 432 /* 433 * No locking needed for AST field. 434 */ 435 #define aston(t) ((t)->t_astflag = 1) 436 #define astoff(t) ((t)->t_astflag = 0) 437 438 /* True if thread is stopped on an event of interest */ 439 #define ISTOPPED(t) ((t)->t_state == TS_STOPPED && \ 440 !((t)->t_schedflag & TS_PSTART)) 441 442 /* True if thread is asleep and wakeable */ 443 #define ISWAKEABLE(t) (((t)->t_state == TS_SLEEP && \ 444 ((t)->t_flag & T_WAKEABLE))) 445 446 /* True if thread is on the wait queue */ 447 #define ISWAITING(t) ((t)->t_state == TS_WAIT) 448 449 /* similar to ISTOPPED except the event of interest is CPR */ 450 #define CPR_ISTOPPED(t) ((t)->t_state == TS_STOPPED && \ 451 !((t)->t_schedflag & TS_RESUME)) 452 453 /* 454 * True if thread is virtually stopped (is or was asleep in 455 * one of the lwp_*() system calls and marked to stop by /proc.) 456 */ 457 #define VSTOPPED(t) ((t)->t_proc_flag & TP_PRVSTOP) 458 459 /* similar to VSTOPPED except the point of interest is CPR */ 460 #define CPR_VSTOPPED(t) \ 461 ((t)->t_state == TS_SLEEP && \ 462 (t)->t_wchan0 != NULL && \ 463 ((t)->t_flag & T_WAKEABLE) && \ 464 ((t)->t_proc_flag & TP_CHKPT)) 465 466 /* True if thread has been stopped by hold*() or was created stopped */ 467 #define SUSPENDED(t) ((t)->t_state == TS_STOPPED && \ 468 ((t)->t_schedflag & (TS_CSTART|TS_UNPAUSE)) != (TS_CSTART|TS_UNPAUSE)) 469 470 /* True if thread possesses an inherited priority */ 471 #define INHERITED(t) ((t)->t_epri != 0) 472 473 /* The dispatch priority of a thread */ 474 #define DISP_PRIO(t) ((t)->t_epri > (t)->t_pri ? (t)->t_epri : (t)->t_pri) 475 476 /* The assigned priority of a thread */ 477 #define ASSIGNED_PRIO(t) ((t)->t_pri) 478 479 /* 480 * Macros to determine whether a thread can be swapped. 481 * If t_lock is held, the thread is either on a processor or being swapped. 482 */ 483 #define SWAP_OK(t) (!LOCK_HELD(&(t)->t_lock)) 484 485 /* 486 * proctot(x) 487 * convert a proc pointer to a thread pointer. this only works with 488 * procs that have only one lwp. 489 * 490 * proctolwp(x) 491 * convert a proc pointer to a lwp pointer. this only works with 492 * procs that have only one lwp. 493 * 494 * ttolwp(x) 495 * convert a thread pointer to its lwp pointer. 496 * 497 * ttoproc(x) 498 * convert a thread pointer to its proc pointer. 499 * 500 * ttoproj(x) 501 * convert a thread pointer to its project pointer. 502 * 503 * ttozone(x) 504 * convert a thread pointer to its zone pointer. 505 * 506 * lwptot(x) 507 * convert a lwp pointer to its thread pointer. 508 * 509 * lwptoproc(x) 510 * convert a lwp to its proc pointer. 511 */ 512 #define proctot(x) ((x)->p_tlist) 513 #define proctolwp(x) ((x)->p_tlist->t_lwp) 514 #define ttolwp(x) ((x)->t_lwp) 515 #define ttoproc(x) ((x)->t_procp) 516 #define ttoproj(x) ((x)->t_proj) 517 #define ttozone(x) ((x)->t_procp->p_zone) 518 #define lwptot(x) ((x)->lwp_thread) 519 #define lwptoproc(x) ((x)->lwp_procp) 520 521 #define t_pc t_pcb.val[0] 522 #define t_sp t_pcb.val[1] 523 524 #ifdef _KERNEL 525 526 extern kthread_t *threadp(void); /* inline, returns thread pointer */ 527 #define curthread (threadp()) /* current thread pointer */ 528 #define curproc (ttoproc(curthread)) /* current process pointer */ 529 #define curproj (ttoproj(curthread)) /* current project pointer */ 530 #define curzone (curproc->p_zone) /* current zone pointer */ 531 532 extern struct _kthread t0; /* the scheduler thread */ 533 extern kmutex_t pidlock; /* global process lock */ 534 535 /* 536 * thread_free_lock is used by the tick accounting thread to keep a thread 537 * from being freed while it is being examined. 538 */ 539 #define THREAD_FREE_NUM 1024 540 #define THREAD_FREE_MASK (THREAD_FREE_NUM - 1) 541 #define THREAD_FREE_SHIFT_BITS 5 542 #define THREAD_FREE_SHIFT(t) ((uintptr_t)t >> THREAD_FREE_SHIFT_BITS) 543 #define THREAD_FREE_HASH(t) (THREAD_FREE_SHIFT(t) & THREAD_FREE_MASK) 544 545 typedef struct thread_free_lock { 546 kmutex_t tf_lock; 547 uchar_t tf_pad[64 - sizeof (kmutex_t)]; 548 } thread_free_lock_t; 549 550 extern void thread_free_prevent(kthread_t *); 551 extern void thread_free_allow(kthread_t *); 552 553 /* 554 * Routines to change the priority and effective priority 555 * of a thread-locked thread, whatever its state. 556 */ 557 extern int thread_change_pri(kthread_t *t, pri_t disp_pri, int front); 558 extern void thread_change_epri(kthread_t *t, pri_t disp_pri); 559 560 /* 561 * Routines that manipulate the dispatcher lock for the thread. 562 * The locking heirarchy is as follows: 563 * cpu_lock > sleepq locks > run queue locks 564 */ 565 void thread_transition(kthread_t *); /* move to transition lock */ 566 void thread_stop(kthread_t *); /* move to stop lock */ 567 void thread_lock(kthread_t *); /* lock thread and its queue */ 568 void thread_lock_high(kthread_t *); /* lock thread and its queue */ 569 void thread_onproc(kthread_t *, struct cpu *); /* set onproc state lock */ 570 571 #define thread_unlock(t) disp_lock_exit((t)->t_lockp) 572 #define thread_unlock_high(t) disp_lock_exit_high((t)->t_lockp) 573 #define thread_unlock_nopreempt(t) disp_lock_exit_nopreempt((t)->t_lockp) 574 575 #define THREAD_LOCK_HELD(t) (DISP_LOCK_HELD((t)->t_lockp)) 576 577 extern disp_lock_t transition_lock; /* lock protecting transiting threads */ 578 extern disp_lock_t stop_lock; /* lock protecting stopped threads */ 579 580 caddr_t thread_stk_init(caddr_t); /* init thread stack */ 581 582 extern int default_binding_mode; 583 584 #endif /* _KERNEL */ 585 586 /* 587 * Macros to indicate that the thread holds resources that could be critical 588 * to other kernel threads, so this thread needs to have kernel priority 589 * if it blocks or is preempted. Note that this is not necessary if the 590 * resource is a mutex or a writer lock because of priority inheritance. 591 * 592 * The only way one thread may legally manipulate another thread's t_kpri_req 593 * is to hold the target thread's thread lock while that thread is asleep. 594 * (The rwlock code does this to implement direct handoff to waiting readers.) 595 */ 596 #define THREAD_KPRI_REQUEST() (curthread->t_kpri_req++) 597 #define THREAD_KPRI_RELEASE() (curthread->t_kpri_req--) 598 #define THREAD_KPRI_RELEASE_N(n) (curthread->t_kpri_req -= (n)) 599 600 /* 601 * Macro to change a thread's priority. 602 */ 603 #define THREAD_CHANGE_PRI(t, pri) { \ 604 pri_t __new_pri = (pri); \ 605 DTRACE_SCHED2(change__pri, kthread_t *, (t), pri_t, __new_pri); \ 606 (t)->t_pri = __new_pri; \ 607 schedctl_set_cidpri(t); \ 608 } 609 610 /* 611 * Macro to indicate that a thread's priority is about to be changed. 612 */ 613 #define THREAD_WILLCHANGE_PRI(t, pri) { \ 614 DTRACE_SCHED2(change__pri, kthread_t *, (t), pri_t, (pri)); \ 615 } 616 617 /* 618 * Macros to change thread state and the associated lock. 619 */ 620 #define THREAD_SET_STATE(tp, state, lp) \ 621 ((tp)->t_state = state, (tp)->t_lockp = lp) 622 623 /* 624 * Point it at the transition lock, which is always held. 625 * The previosly held lock is dropped. 626 */ 627 #define THREAD_TRANSITION(tp) thread_transition(tp); 628 /* 629 * Set the thread's lock to be the transition lock, without dropping 630 * previosly held lock. 631 */ 632 #define THREAD_TRANSITION_NOLOCK(tp) ((tp)->t_lockp = &transition_lock) 633 634 /* 635 * Put thread in run state, and set the lock pointer to the dispatcher queue 636 * lock pointer provided. This lock should be held. 637 */ 638 #define THREAD_RUN(tp, lp) THREAD_SET_STATE(tp, TS_RUN, lp) 639 640 /* 641 * Put thread in wait state, and set the lock pointer to the wait queue 642 * lock pointer provided. This lock should be held. 643 */ 644 #define THREAD_WAIT(tp, lp) THREAD_SET_STATE(tp, TS_WAIT, lp) 645 646 /* 647 * Put thread in run state, and set the lock pointer to the dispatcher queue 648 * lock pointer provided (i.e., the "swapped_lock"). This lock should be held. 649 */ 650 #define THREAD_SWAP(tp, lp) THREAD_SET_STATE(tp, TS_RUN, lp) 651 652 /* 653 * Put the thread in zombie state and set the lock pointer to NULL. 654 * The NULL will catch anything that tries to lock a zombie. 655 */ 656 #define THREAD_ZOMB(tp) THREAD_SET_STATE(tp, TS_ZOMB, NULL) 657 658 /* 659 * Set the thread into ONPROC state, and point the lock at the CPUs 660 * lock for the onproc thread(s). This lock should be held, so the 661 * thread deoes not become unlocked, since these stores can be reordered. 662 */ 663 #define THREAD_ONPROC(tp, cpu) \ 664 THREAD_SET_STATE(tp, TS_ONPROC, &(cpu)->cpu_thread_lock) 665 666 /* 667 * Set the thread into the TS_SLEEP state, and set the lock pointer to 668 * to some sleep queue's lock. The new lock should already be held. 669 */ 670 #define THREAD_SLEEP(tp, lp) { \ 671 disp_lock_t *tlp; \ 672 tlp = (tp)->t_lockp; \ 673 THREAD_SET_STATE(tp, TS_SLEEP, lp); \ 674 disp_lock_exit_high(tlp); \ 675 } 676 677 /* 678 * Interrupt threads are created in TS_FREE state, and their lock 679 * points at the associated CPU's lock. 680 */ 681 #define THREAD_FREEINTR(tp, cpu) \ 682 THREAD_SET_STATE(tp, TS_FREE, &(cpu)->cpu_thread_lock) 683 684 /* if tunable kmem_stackinfo is set, fill kthread stack with a pattern */ 685 #define KMEM_STKINFO_PATTERN 0xbadcbadcbadcbadcULL 686 687 /* 688 * If tunable kmem_stackinfo is set, log the latest KMEM_LOG_STK_USAGE_SIZE 689 * dead kthreads that used their kernel stack the most. 690 */ 691 #define KMEM_STKINFO_LOG_SIZE 16 692 693 /* kthread name (cmd/lwpid) string size in the stackinfo log */ 694 #define KMEM_STKINFO_STR_SIZE 64 695 696 /* 697 * stackinfo logged data. 698 */ 699 typedef struct kmem_stkinfo { 700 caddr_t kthread; /* kthread pointer */ 701 caddr_t t_startpc; /* where kthread started */ 702 caddr_t start; /* kthread stack start address */ 703 size_t stksz; /* kthread stack size */ 704 size_t percent; /* kthread stack high water mark */ 705 id_t t_tid; /* kthread id */ 706 char cmd[KMEM_STKINFO_STR_SIZE]; /* kthread name (cmd/lwpid) */ 707 } kmem_stkinfo_t; 708 709 #ifdef __cplusplus 710 } 711 #endif 712 713 #endif /* _SYS_THREAD_H */ 714