Public Git Hosting - opensolaris.git/blob - usr/src/uts/common/sys/thread.h

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 */

22 /*

24 * Use is subject to license terms.

25 */

27 #ifndef _SYS_THREAD_H

28 #define _SYS_THREAD_H

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

41 #ifdef __cplusplus

42 extern "C" {

43 #endif

45 /*

46 * The thread object, its states, and the methods by which it

47 * is accessed.

48 */

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 */

62 typedef struct ctxop {

        void    (*save_op)(void *);     /* function to invoke to save context */

        void    (*restore_op)(void *);  /* function to invoke to restore ctx */

        void    (*fork_op)(void *, void *);     /* invoke to fork context */

        void    (*lwp_create_op)(void *, void *);       /* lwp_create context */

        void    (*exit_op)(void *);     /* invoked during {thread,lwp}_exit() */

        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;

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 */

        int     a_buf[1];       /* buffer to which a_fd initially refers */

83 } afd_t;

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;

95 typedef struct _kthread *kthread_id_t;

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) */

        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 */

        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 kmutex_t t_wait_mutex; /* used in CV wait functions */

345 } kthread_t;

346

347 /*

348 * Thread flag (t_flag) definitions.

349 * These flags must be changed only for the current thread,

350 * and not during preemption code, since the code being

351 * preempted could be modifying the flags.

352 *

353 * For the most part these flags do not need locking.

354 * The following flags will only be changed while the thread_lock is held,

355 * to give assurrance that they are consistent with t_state:

356 * T_WAKEABLE

357 */

358 #define T_INTR_THREAD 0x0001 /* thread is an interrupt thread */

359 #define T_WAKEABLE 0x0002 /* thread is blocked, signals enabled */

360 #define T_TOMASK 0x0004 /* use lwp_sigoldmask on return from signal */

361 #define T_TALLOCSTK 0x0008 /* thread structure allocated from stk */

362 #define T_FORKALL 0x0010 /* thread was cloned by forkall() */

363 #define T_WOULDBLOCK 0x0020 /* for lockfs */

364 #define T_DONTBLOCK 0x0040 /* for lockfs */

365 #define T_DONTPEND 0x0080 /* for lockfs */

366 #define T_SYS_PROF 0x0100 /* profiling on for duration of system call */

367 #define T_WAITCVSEM 0x0200 /* waiting for a lwp_cv or lwp_sema on sleepq */

368 #define T_WATCHPT 0x0400 /* thread undergoing a watchpoint emulation */

369 #define T_PANIC 0x0800 /* thread initiated a system panic */

370 #define T_DFLTSTK 0x1000 /* stack is default size */

371 #define T_CAPTURING 0x2000 /* thread is in page capture logic */

372 #define T_VFPARENT 0x4000 /* thread is vfork parent, must call vfwait */

373 #define T_DONTDTRACE 0x8000 /* disable DTrace probes */

374

375 /*

376 * Flags in t_proc_flag.

377 * These flags must be modified only when holding the p_lock

378 * for the associated process.

379 */

380 #define TP_DAEMON 0x0001 /* this is an LWP_DAEMON lwp */

381 #define TP_HOLDLWP 0x0002 /* hold thread's lwp */

382 #define TP_TWAIT 0x0004 /* wait to be freed by lwp_wait() */

383 #define TP_LWPEXIT 0x0008 /* lwp has exited */

384 #define TP_PRSTOP 0x0010 /* thread is being stopped via /proc */

385 #define TP_CHKPT 0x0020 /* thread is being stopped via CPR checkpoint */

386 #define TP_EXITLWP 0x0040 /* terminate this lwp */

387 #define TP_PRVSTOP 0x0080 /* thread is virtually stopped via /proc */

388 #define TP_MSACCT 0x0100 /* collect micro-state accounting information */

389 #define TP_STOPPING 0x0200 /* thread is executing stop() */

390 #define TP_WATCHPT 0x0400 /* process has watchpoints in effect */

391 #define TP_PAUSE 0x0800 /* process is being stopped via pauselwps() */

392 #define TP_CHANGEBIND 0x1000 /* thread has a new cpu/cpupart binding */

393 #define TP_ZTHREAD 0x2000 /* this is a kernel thread for a zone */

394 #define TP_WATCHSTOP 0x4000 /* thread is stopping via holdwatch() */

395

396 /*

397 * Thread scheduler flag (t_schedflag) definitions.

398 * The thread must be locked via thread_lock() or equiv. to change these.

399 */

400 #define TS_LOAD 0x0001 /* thread is in memory */

401 #define TS_DONT_SWAP 0x0002 /* thread/lwp should not be swapped */

402 #define TS_SWAPENQ 0x0004 /* swap thread when it reaches a safe point */

403 #define TS_ON_SWAPQ 0x0008 /* thread is on the swap queue */

404 #define TS_SIGNALLED 0x0010 /* thread was awakened by cv_signal() */

405 #define TS_PROJWAITQ 0x0020 /* thread is on its project's waitq */

406 #define TS_ZONEWAITQ 0x0040 /* thread is on its zone's waitq */

407 #define TS_CSTART 0x0100 /* setrun() by continuelwps() */

408 #define TS_UNPAUSE 0x0200 /* setrun() by unpauselwps() */

409 #define TS_XSTART 0x0400 /* setrun() by SIGCONT */

410 #define TS_PSTART 0x0800 /* setrun() by /proc */

411 #define TS_RESUME 0x1000 /* setrun() by CPR resume process */

412 #define TS_CREATE 0x2000 /* setrun() by syslwp_create() */

413 #define TS_RUNQMATCH 0x4000 /* exact run queue balancing by setbackdq() */

414 #define TS_ALLSTART \

416 #define TS_ANYWAITQ (TS_PROJWAITQ|TS_ZONEWAITQ)

417

418 /*

419 * Thread binding types

420 */

421 #define TB_ALLHARD 0

422 #define TB_CPU_SOFT 0x01 /* soft binding to CPU */

423 #define TB_PSET_SOFT 0x02 /* soft binding to pset */

424

425 #define TB_CPU_SOFT_SET(t) ((t)->t_bindflag |= TB_CPU_SOFT)

426 #define TB_CPU_HARD_SET(t) ((t)->t_bindflag &= ~TB_CPU_SOFT)

427 #define TB_PSET_SOFT_SET(t) ((t)->t_bindflag |= TB_PSET_SOFT)

428 #define TB_PSET_HARD_SET(t) ((t)->t_bindflag &= ~TB_PSET_SOFT)

429 #define TB_CPU_IS_SOFT(t) ((t)->t_bindflag & TB_CPU_SOFT)

430 #define TB_CPU_IS_HARD(t) (!TB_CPU_IS_SOFT(t))

431 #define TB_PSET_IS_SOFT(t) ((t)->t_bindflag & TB_PSET_SOFT)

432

433 /*

434 * No locking needed for AST field.

435 */

436 #define aston(t) ((t)->t_astflag = 1)

437 #define astoff(t) ((t)->t_astflag = 0)

438

439 /* True if thread is stopped on an event of interest */

440 #define ISTOPPED(t) ((t)->t_state == TS_STOPPED && \

441 !((t)->t_schedflag & TS_PSTART))

442

443 /* True if thread is asleep and wakeable */

444 #define ISWAKEABLE(t) (((t)->t_state == TS_SLEEP && \

445 ((t)->t_flag & T_WAKEABLE)))

446

447 /* True if thread is on the wait queue */

448 #define ISWAITING(t) ((t)->t_state == TS_WAIT)

449

450 /* similar to ISTOPPED except the event of interest is CPR */

451 #define CPR_ISTOPPED(t) ((t)->t_state == TS_STOPPED && \

452 !((t)->t_schedflag & TS_RESUME))

453

454 /*

455 * True if thread is virtually stopped (is or was asleep in

456 * one of the lwp_*() system calls and marked to stop by /proc.)

457 */

458 #define VSTOPPED(t) ((t)->t_proc_flag & TP_PRVSTOP)

459

460 /* similar to VSTOPPED except the point of interest is CPR */

461 #define CPR_VSTOPPED(t) \

462 ((t)->t_state == TS_SLEEP && \

463 (t)->t_wchan0 != NULL && \

464 ((t)->t_flag & T_WAKEABLE) && \

465 ((t)->t_proc_flag & TP_CHKPT))

466

467 /* True if thread has been stopped by hold*() or was created stopped */

468 #define SUSPENDED(t) ((t)->t_state == TS_STOPPED && \

469 ((t)->t_schedflag & (TS_CSTART|TS_UNPAUSE)) != (TS_CSTART|TS_UNPAUSE))

470

471 /* True if thread possesses an inherited priority */

472 #define INHERITED(t) ((t)->t_epri != 0)

473

474 /* The dispatch priority of a thread */

475 #define DISP_PRIO(t) ((t)->t_epri > (t)->t_pri ? (t)->t_epri : (t)->t_pri)

476

477 /* The assigned priority of a thread */

478 #define ASSIGNED_PRIO(t) ((t)->t_pri)

479

480 /*

481 * Macros to determine whether a thread can be swapped.

482 * If t_lock is held, the thread is either on a processor or being swapped.

483 */

484 #define SWAP_OK(t) (!LOCK_HELD(&(t)->t_lock))

485

486 /*

487 * proctot(x)

488 * convert a proc pointer to a thread pointer. this only works with

489 * procs that have only one lwp.

490 *

491 * proctolwp(x)

492 * convert a proc pointer to a lwp pointer. this only works with

493 * procs that have only one lwp.

494 *

495 * ttolwp(x)

496 * convert a thread pointer to its lwp pointer.

497 *

498 * ttoproc(x)

499 * convert a thread pointer to its proc pointer.

500 *

501 * ttoproj(x)

502 * convert a thread pointer to its project pointer.

503 *

504 * ttozone(x)

505 * convert a thread pointer to its zone pointer.

506 *

507 * lwptot(x)

508 * convert a lwp pointer to its thread pointer.

509 *

510 * lwptoproc(x)

511 * convert a lwp to its proc pointer.

512 */

513 #define proctot(x) ((x)->p_tlist)

514 #define proctolwp(x) ((x)->p_tlist->t_lwp)

515 #define ttolwp(x) ((x)->t_lwp)

516 #define ttoproc(x) ((x)->t_procp)

517 #define ttoproj(x) ((x)->t_proj)

518 #define ttozone(x) ((x)->t_procp->p_zone)

519 #define lwptot(x) ((x)->lwp_thread)

520 #define lwptoproc(x) ((x)->lwp_procp)

521

522 #define t_pc t_pcb.val[0]

523 #define t_sp t_pcb.val[1]

524

525 #ifdef _KERNEL

526

extern  kthread_t       *threadp(void); /* inline, returns thread pointer */

528 #define curthread (threadp()) /* current thread pointer */

529 #define curproc (ttoproc(curthread)) /* current process pointer */

530 #define curproj (ttoproj(curthread)) /* current project pointer */

531 #define curzone (curproc->p_zone) /* current zone pointer */

532

533 extern struct _kthread t0; /* the scheduler thread */

534 extern kmutex_t pidlock; /* global process lock */

535

536 /*

537 * thread_free_lock is used by the tick accounting thread to keep a thread

538 * from being freed while it is being examined.

539 */

540 #define THREAD_FREE_NUM 1024

541 #define THREAD_FREE_MASK (THREAD_FREE_NUM - 1)

542 #define THREAD_FREE_SHIFT_BITS 5

543 #define THREAD_FREE_SHIFT(t) ((uintptr_t)t >> THREAD_FREE_SHIFT_BITS)

544 #define THREAD_FREE_HASH(t) (THREAD_FREE_SHIFT(t) & THREAD_FREE_MASK)

545

546 typedef struct thread_free_lock {

547 kmutex_t tf_lock;

        uchar_t         tf_pad[64 - sizeof (kmutex_t)];

549 } thread_free_lock_t;

550

extern void     thread_free_prevent(kthread_t *);

extern void     thread_free_allow(kthread_t *);

553

554 /*

555 * Routines to change the priority and effective priority

556 * of a thread-locked thread, whatever its state.

557 */

extern int      thread_change_pri(kthread_t *t, pri_t disp_pri, int front);

extern void     thread_change_epri(kthread_t *t, pri_t disp_pri);

560

561 /*

562 * Routines that manipulate the dispatcher lock for the thread.

563 * The locking heirarchy is as follows:

564 * cpu_lock > sleepq locks > run queue locks

565 */

void    thread_transition(kthread_t *); /* move to transition lock */

void    thread_stop(kthread_t *);       /* move to stop lock */

void    thread_lock(kthread_t *);       /* lock thread and its queue */

void    thread_lock_high(kthread_t *);  /* lock thread and its queue */

void    thread_onproc(kthread_t *, struct cpu *); /* set onproc state lock */

571

572 #define thread_unlock(t) disp_lock_exit((t)->t_lockp)

573 #define thread_unlock_high(t) disp_lock_exit_high((t)->t_lockp)

574 #define thread_unlock_nopreempt(t) disp_lock_exit_nopreempt((t)->t_lockp)

575

576 #define THREAD_LOCK_HELD(t) (DISP_LOCK_HELD((t)->t_lockp))

577

578 extern disp_lock_t transition_lock; /* lock protecting transiting threads */

579 extern disp_lock_t stop_lock; /* lock protecting stopped threads */

580

581 caddr_t thread_stk_init(caddr_t); /* init thread stack */

582

583 extern int default_binding_mode;

584

585 #endif /* _KERNEL */

586

587 /*

588 * Macros to indicate that the thread holds resources that could be critical

589 * to other kernel threads, so this thread needs to have kernel priority

590 * if it blocks or is preempted. Note that this is not necessary if the

591 * resource is a mutex or a writer lock because of priority inheritance.

592 *

593 * The only way one thread may legally manipulate another thread's t_kpri_req

594 * is to hold the target thread's thread lock while that thread is asleep.

595 * (The rwlock code does this to implement direct handoff to waiting readers.)

596 */

597 #define THREAD_KPRI_REQUEST() (curthread->t_kpri_req++)

598 #define THREAD_KPRI_RELEASE() (curthread->t_kpri_req--)

599 #define THREAD_KPRI_RELEASE_N(n) (curthread->t_kpri_req -= (n))

600

601 /*

602 * Macro to change a thread's priority.

603 */

604 #define THREAD_CHANGE_PRI(t, pri) { \

605 pri_t __new_pri = (pri); \

606 DTRACE_SCHED2(change__pri, kthread_t *, (t), pri_t, __new_pri); \

607 (t)->t_pri = __new_pri; \

608 schedctl_set_cidpri(t); \

609 }

610

611 /*

612 * Macro to indicate that a thread's priority is about to be changed.

613 */

614 #define THREAD_WILLCHANGE_PRI(t, pri) { \

615 DTRACE_SCHED2(change__pri, kthread_t *, (t), pri_t, (pri)); \

616 }

617

618 /*

619 * Macros to change thread state and the associated lock.

620 */

621 #define THREAD_SET_STATE(tp, state, lp) \

622 ((tp)->t_state = state, (tp)->t_lockp = lp)

623

624 /*

625 * Point it at the transition lock, which is always held.

626 * The previosly held lock is dropped.

627 */

628 #define THREAD_TRANSITION(tp) thread_transition(tp);

629 /*

630 * Set the thread's lock to be the transition lock, without dropping

631 * previosly held lock.

632 */

633 #define THREAD_TRANSITION_NOLOCK(tp) ((tp)->t_lockp = &transition_lock)

634

635 /*

636 * Put thread in run state, and set the lock pointer to the dispatcher queue

637 * lock pointer provided. This lock should be held.

638 */

639 #define THREAD_RUN(tp, lp) THREAD_SET_STATE(tp, TS_RUN, lp)

640

641 /*

642 * Put thread in wait state, and set the lock pointer to the wait queue

643 * lock pointer provided. This lock should be held.

644 */

645 #define THREAD_WAIT(tp, lp) THREAD_SET_STATE(tp, TS_WAIT, lp)

646

647 /*

648 * Put thread in run state, and set the lock pointer to the dispatcher queue

649 * lock pointer provided (i.e., the "swapped_lock"). This lock should be held.

650 */

651 #define THREAD_SWAP(tp, lp) THREAD_SET_STATE(tp, TS_RUN, lp)

652

653 /*

654 * Put the thread in zombie state and set the lock pointer to NULL.

655 * The NULL will catch anything that tries to lock a zombie.

656 */

657 #define THREAD_ZOMB(tp) THREAD_SET_STATE(tp, TS_ZOMB, NULL)

658

659 /*

660 * Set the thread into ONPROC state, and point the lock at the CPUs

661 * lock for the onproc thread(s). This lock should be held, so the

662 * thread deoes not become unlocked, since these stores can be reordered.

663 */

664 #define THREAD_ONPROC(tp, cpu) \

665 THREAD_SET_STATE(tp, TS_ONPROC, &(cpu)->cpu_thread_lock)

666

667 /*

668 * Set the thread into the TS_SLEEP state, and set the lock pointer to

669 * to some sleep queue's lock. The new lock should already be held.

670 */

671 #define THREAD_SLEEP(tp, lp) { \

672 disp_lock_t *tlp; \

673 tlp = (tp)->t_lockp; \

674 THREAD_SET_STATE(tp, TS_SLEEP, lp); \

675 disp_lock_exit_high(tlp); \

676 }

677

678 /*

679 * Interrupt threads are created in TS_FREE state, and their lock

680 * points at the associated CPU's lock.

681 */

682 #define THREAD_FREEINTR(tp, cpu) \

683 THREAD_SET_STATE(tp, TS_FREE, &(cpu)->cpu_thread_lock)

684

685 /* if tunable kmem_stackinfo is set, fill kthread stack with a pattern */

686 #define KMEM_STKINFO_PATTERN 0xbadcbadcbadcbadcULL

687

688 /*

689 * If tunable kmem_stackinfo is set, log the latest KMEM_LOG_STK_USAGE_SIZE

690 * dead kthreads that used their kernel stack the most.

691 */

692 #define KMEM_STKINFO_LOG_SIZE 16

693

694 /* kthread name (cmd/lwpid) string size in the stackinfo log */

695 #define KMEM_STKINFO_STR_SIZE 64

696

697 /*

698 * stackinfo logged data.

699 */

700 typedef struct kmem_stkinfo {

701 caddr_t kthread; /* kthread pointer */

702 caddr_t t_startpc; /* where kthread started */

703 caddr_t start; /* kthread stack start address */

704 size_t stksz; /* kthread stack size */

705 size_t percent; /* kthread stack high water mark */

706 id_t t_tid; /* kthread id */

707 char cmd[KMEM_STKINFO_STR_SIZE]; /* kthread name (cmd/lwpid) */

708 } kmem_stkinfo_t;

709

710 #ifdef __cplusplus

711 }

712 #endif

713

714 #endif /* _SYS_THREAD_H */