xref: /freebsd/lib/libthr/thread/thr_private.h (revision c66ec88fed842fbaad62c30d510644ceb7bd2d71)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (C) 2005 Daniel M. Eischen <deischen@freebsd.org>
5  * Copyright (c) 2005 David Xu <davidxu@freebsd.org>
6  * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>.
7  *
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice unmodified, this list of conditions, and the following
15  *    disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30  *
31  * $FreeBSD$
32  */
33 
34 #ifndef _THR_PRIVATE_H
35 #define _THR_PRIVATE_H
36 
37 /*
38  * Include files.
39  */
40 #include <sys/types.h>
41 #include <sys/time.h>
42 #include <sys/cdefs.h>
43 #include <sys/queue.h>
44 #include <sys/param.h>
45 #include <sys/cpuset.h>
46 #include <machine/atomic.h>
47 #include <errno.h>
48 #include <limits.h>
49 #include <signal.h>
50 #include <stdbool.h>
51 #include <stddef.h>
52 #include <stdio.h>
53 #include <unistd.h>
54 #include <ucontext.h>
55 #include <sys/thr.h>
56 #include <pthread.h>
57 
58 __NULLABILITY_PRAGMA_PUSH
59 
60 #define	SYM_FB10(sym)			__CONCAT(sym, _fb10)
61 #define	SYM_FBP10(sym)			__CONCAT(sym, _fbp10)
62 #define	WEAK_REF(sym, alias)		__weak_reference(sym, alias)
63 #define	SYM_COMPAT(sym, impl, ver)	__sym_compat(sym, impl, ver)
64 #define	SYM_DEFAULT(sym, impl, ver)	__sym_default(sym, impl, ver)
65 
66 #define	FB10_COMPAT(func, sym)				\
67 	WEAK_REF(func, SYM_FB10(sym));			\
68 	SYM_COMPAT(sym, SYM_FB10(sym), FBSD_1.0)
69 
70 #define	FB10_COMPAT_PRIVATE(func, sym)			\
71 	WEAK_REF(func, SYM_FBP10(sym));			\
72 	SYM_DEFAULT(sym, SYM_FBP10(sym), FBSDprivate_1.0)
73 
74 struct pthread;
75 extern struct pthread	*_thr_initial __hidden;
76 
77 #include "pthread_md.h"
78 #include "thr_umtx.h"
79 #include "thread_db.h"
80 
81 #ifdef _PTHREAD_FORCED_UNWIND
82 #define _BSD_SOURCE
83 #include <unwind.h>
84 #endif
85 
86 typedef TAILQ_HEAD(pthreadlist, pthread) pthreadlist;
87 typedef TAILQ_HEAD(atfork_head, pthread_atfork) atfork_head;
88 TAILQ_HEAD(mutex_queue, pthread_mutex);
89 
90 /* Signal to do cancellation */
91 #define	SIGCANCEL		SIGTHR
92 
93 /*
94  * Kernel fatal error handler macro.
95  */
96 #define PANIC(args...)		_thread_exitf(__FILE__, __LINE__, ##args)
97 
98 /* Output debug messages like this: */
99 #define stdout_debug(args...)	_thread_printf(STDOUT_FILENO, ##args)
100 #define stderr_debug(args...)	_thread_printf(STDERR_FILENO, ##args)
101 
102 #ifdef _PTHREADS_INVARIANTS
103 #define THR_ASSERT(cond, msg) do {	\
104 	if (__predict_false(!(cond)))	\
105 		PANIC(msg);		\
106 } while (0)
107 #else
108 #define THR_ASSERT(cond, msg)
109 #endif
110 
111 #ifdef PIC
112 # define STATIC_LIB_REQUIRE(name)
113 #else
114 # define STATIC_LIB_REQUIRE(name) __asm (".globl " #name)
115 #endif
116 
117 #define	TIMESPEC_ADD(dst, src, val)				\
118 	do { 							\
119 		(dst)->tv_sec = (src)->tv_sec + (val)->tv_sec;	\
120 		(dst)->tv_nsec = (src)->tv_nsec + (val)->tv_nsec; \
121 		if ((dst)->tv_nsec >= 1000000000) {		\
122 			(dst)->tv_sec++;			\
123 			(dst)->tv_nsec -= 1000000000;		\
124 		}						\
125 	} while (0)
126 
127 #define	TIMESPEC_SUB(dst, src, val)				\
128 	do { 							\
129 		(dst)->tv_sec = (src)->tv_sec - (val)->tv_sec;	\
130 		(dst)->tv_nsec = (src)->tv_nsec - (val)->tv_nsec; \
131 		if ((dst)->tv_nsec < 0) {			\
132 			(dst)->tv_sec--;			\
133 			(dst)->tv_nsec += 1000000000;		\
134 		}						\
135 	} while (0)
136 
137 /* Magic cookie set for shared pthread locks and cv's pointers */
138 #define	THR_PSHARED_PTR						\
139     ((void *)(uintptr_t)((1ULL << (NBBY * sizeof(long) - 1)) | 1))
140 
141 /* XXX These values should be same as those defined in pthread.h */
142 #define	THR_MUTEX_INITIALIZER		((struct pthread_mutex *)NULL)
143 #define	THR_ADAPTIVE_MUTEX_INITIALIZER	((struct pthread_mutex *)1)
144 #define	THR_MUTEX_DESTROYED		((struct pthread_mutex *)2)
145 #define	THR_COND_INITIALIZER		((struct pthread_cond *)NULL)
146 #define	THR_COND_DESTROYED		((struct pthread_cond *)1)
147 #define	THR_RWLOCK_INITIALIZER		((struct pthread_rwlock *)NULL)
148 #define	THR_RWLOCK_DESTROYED		((struct pthread_rwlock *)1)
149 
150 #define PMUTEX_FLAG_TYPE_MASK	0x0ff
151 #define PMUTEX_FLAG_PRIVATE	0x100
152 #define PMUTEX_FLAG_DEFERRED	0x200
153 #define PMUTEX_TYPE(mtxflags)	((mtxflags) & PMUTEX_FLAG_TYPE_MASK)
154 
155 #define	PMUTEX_OWNER_ID(m)	((m)->m_lock.m_owner & ~UMUTEX_CONTESTED)
156 
157 #define MAX_DEFER_WAITERS       50
158 
159 /*
160  * Values for pthread_mutex m_ps indicator.
161  */
162 #define	PMUTEX_INITSTAGE_ALLOC	0
163 #define	PMUTEX_INITSTAGE_BUSY	1
164 #define	PMUTEX_INITSTAGE_DONE	2
165 
166 struct pthread_mutex {
167 	/*
168 	 * Lock for accesses to this structure.
169 	 */
170 	struct umutex			m_lock;
171 	int				m_flags;
172 	int				m_count;
173 	int				m_spinloops;
174 	int				m_yieldloops;
175 	int				m_ps;	/* pshared init stage */
176 	/*
177 	 * Link for all mutexes a thread currently owns, of the same
178 	 * prio type.
179 	 */
180 	TAILQ_ENTRY(pthread_mutex)	m_qe;
181 	/* Link for all private mutexes a thread currently owns. */
182 	TAILQ_ENTRY(pthread_mutex)	m_pqe;
183 	struct pthread_mutex		*m_rb_prev;
184 };
185 
186 struct pthread_mutex_attr {
187 	enum pthread_mutextype	m_type;
188 	int			m_protocol;
189 	int			m_ceiling;
190 	int			m_pshared;
191 	int			m_robust;
192 };
193 
194 #define PTHREAD_MUTEXATTR_STATIC_INITIALIZER \
195 	{ PTHREAD_MUTEX_DEFAULT, PTHREAD_PRIO_NONE, 0, MUTEX_FLAGS_PRIVATE, \
196 	    PTHREAD_MUTEX_STALLED }
197 
198 struct pthread_cond {
199 	__uint32_t	__has_user_waiters;
200 	struct ucond	kcond;
201 };
202 
203 struct pthread_cond_attr {
204 	int		c_pshared;
205 	int		c_clockid;
206 };
207 
208 struct pthread_barrier {
209 	struct umutex		b_lock;
210 	struct ucond		b_cv;
211 	int64_t			b_cycle;
212 	int			b_count;
213 	int			b_waiters;
214 	int			b_refcount;
215 	int			b_destroying;
216 };
217 
218 struct pthread_barrierattr {
219 	int		pshared;
220 };
221 
222 struct pthread_spinlock {
223 	struct umutex	s_lock;
224 };
225 
226 /*
227  * Flags for condition variables.
228  */
229 #define COND_FLAGS_PRIVATE	0x01
230 #define COND_FLAGS_INITED	0x02
231 #define COND_FLAGS_BUSY		0x04
232 
233 /*
234  * Cleanup definitions.
235  */
236 struct pthread_cleanup {
237 	struct pthread_cleanup	*prev;
238 	void			(*routine)(void *);
239 	void			*routine_arg;
240 	int			onheap;
241 };
242 
243 #define	THR_CLEANUP_PUSH(td, func, arg) {		\
244 	struct pthread_cleanup __cup;			\
245 							\
246 	__cup.routine = func;				\
247 	__cup.routine_arg = arg;			\
248 	__cup.onheap = 0;				\
249 	__cup.prev = (td)->cleanup;			\
250 	(td)->cleanup = &__cup;
251 
252 #define	THR_CLEANUP_POP(td, exec)			\
253 	(td)->cleanup = __cup.prev;			\
254 	if ((exec) != 0)				\
255 		__cup.routine(__cup.routine_arg);	\
256 }
257 
258 struct pthread_atfork {
259 	TAILQ_ENTRY(pthread_atfork) qe;
260 	void (*prepare)(void);
261 	void (*parent)(void);
262 	void (*child)(void);
263 };
264 
265 struct pthread_attr {
266 #define pthread_attr_start_copy	sched_policy
267 	int	sched_policy;
268 	int	sched_inherit;
269 	int	prio;
270 	int	suspend;
271 #define	THR_STACK_USER		0x100	/* 0xFF reserved for <pthread.h> */
272 	int	flags;
273 	void	*stackaddr_attr;
274 	size_t	stacksize_attr;
275 	size_t	guardsize_attr;
276 #define pthread_attr_end_copy	cpuset
277 	cpuset_t	*cpuset;
278 	size_t	cpusetsize;
279 };
280 
281 struct wake_addr {
282 	struct wake_addr *link;
283 	unsigned int	value;
284 	char		pad[12];
285 };
286 
287 struct sleepqueue {
288 	TAILQ_HEAD(, pthread)    sq_blocked;
289 	SLIST_HEAD(, sleepqueue) sq_freeq;
290 	LIST_ENTRY(sleepqueue)   sq_hash;
291 	SLIST_ENTRY(sleepqueue)  sq_flink;
292 	void			 *sq_wchan;
293 	int			 sq_type;
294 };
295 
296 /*
297  * Thread creation state attributes.
298  */
299 #define THR_CREATE_RUNNING		0
300 #define THR_CREATE_SUSPENDED		1
301 
302 /*
303  * Miscellaneous definitions.
304  */
305 #define THR_STACK_DEFAULT		(sizeof(void *) / 4 * 1024 * 1024)
306 
307 /*
308  * Maximum size of initial thread's stack.  This perhaps deserves to be larger
309  * than the stacks of other threads, since many applications are likely to run
310  * almost entirely on this stack.
311  */
312 #define THR_STACK_INITIAL		(THR_STACK_DEFAULT * 2)
313 
314 /*
315  * Define priorities returned by kernel.
316  */
317 #define THR_MIN_PRIORITY		(_thr_priorities[SCHED_OTHER-1].pri_min)
318 #define THR_MAX_PRIORITY		(_thr_priorities[SCHED_OTHER-1].pri_max)
319 #define THR_DEF_PRIORITY		(_thr_priorities[SCHED_OTHER-1].pri_default)
320 
321 #define THR_MIN_RR_PRIORITY		(_thr_priorities[SCHED_RR-1].pri_min)
322 #define THR_MAX_RR_PRIORITY		(_thr_priorities[SCHED_RR-1].pri_max)
323 #define THR_DEF_RR_PRIORITY		(_thr_priorities[SCHED_RR-1].pri_default)
324 
325 /* XXX The SCHED_FIFO should have same priority range as SCHED_RR */
326 #define THR_MIN_FIFO_PRIORITY		(_thr_priorities[SCHED_FIFO_1].pri_min)
327 #define THR_MAX_FIFO_PRIORITY		(_thr_priorities[SCHED_FIFO-1].pri_max)
328 #define THR_DEF_FIFO_PRIORITY		(_thr_priorities[SCHED_FIFO-1].pri_default)
329 
330 struct pthread_prio {
331 	int	pri_min;
332 	int	pri_max;
333 	int	pri_default;
334 };
335 
336 struct pthread_rwlockattr {
337 	int		pshared;
338 };
339 
340 struct pthread_rwlock {
341 	struct urwlock 	lock;
342 	uint32_t	owner;
343 };
344 
345 /*
346  * Thread states.
347  */
348 enum pthread_state {
349 	PS_RUNNING,
350 	PS_DEAD
351 };
352 
353 struct pthread_specific_elem {
354 	const void	*data;
355 	int		seqno;
356 };
357 
358 struct pthread_key {
359 	volatile int	allocated;
360 	int		seqno;
361 	void            (*destructor)(void *);
362 };
363 
364 /*
365  * lwpid_t is 32bit but kernel thr API exports tid as long type
366  * to preserve the ABI for M:N model in very early date (r131431).
367  */
368 #define TID(thread)	((uint32_t) ((thread)->tid))
369 
370 /*
371  * Thread structure.
372  */
373 struct pthread {
374 #define _pthread_startzero	tid
375 	/* Kernel thread id. */
376 	long			tid;
377 #define	TID_TERMINATED		1
378 
379 	/*
380 	 * Lock for accesses to this thread structure.
381 	 */
382 	struct umutex		lock;
383 
384 	/* Internal condition variable cycle number. */
385 	uint32_t		cycle;
386 
387 	/* How many low level locks the thread held. */
388 	int			locklevel;
389 
390 	/*
391 	 * Set to non-zero when this thread has entered a critical
392 	 * region.  We allow for recursive entries into critical regions.
393 	 */
394 	int			critical_count;
395 
396 	/* Signal blocked counter. */
397 	int			sigblock;
398 
399 	/* Fast sigblock var. */
400 	uint32_t		fsigblock;
401 
402 	/* Queue entry for list of all threads. */
403 	TAILQ_ENTRY(pthread)	tle;	/* link for all threads in process */
404 
405 	/* Queue entry for GC lists. */
406 	TAILQ_ENTRY(pthread)	gcle;
407 
408 	/* Hash queue entry. */
409 	LIST_ENTRY(pthread)	hle;
410 
411 	/* Sleep queue entry */
412 	TAILQ_ENTRY(pthread)    wle;
413 
414 	/* Threads reference count. */
415 	int			refcount;
416 
417 	/*
418 	 * Thread start routine, argument, stack pointer and thread
419 	 * attributes.
420 	 */
421 	void			*(*start_routine)(void *);
422 	void			*arg;
423 	struct pthread_attr	attr;
424 
425 #define	SHOULD_CANCEL(thr)					\
426 	((thr)->cancel_pending && (thr)->cancel_enable &&	\
427 	 (thr)->no_cancel == 0)
428 
429 	/* Cancellation is enabled */
430 	int			cancel_enable;
431 
432 	/* Cancellation request is pending */
433 	int			cancel_pending;
434 
435 	/* Thread is at cancellation point */
436 	int			cancel_point;
437 
438 	/* Cancellation is temporarily disabled */
439 	int			no_cancel;
440 
441 	/* Asynchronouse cancellation is enabled */
442 	int			cancel_async;
443 
444 	/* Cancellation is in progress */
445 	int			cancelling;
446 
447 	/* Thread temporary signal mask. */
448 	sigset_t		sigmask;
449 
450 	/* Thread should unblock SIGCANCEL. */
451 	int			unblock_sigcancel;
452 
453 	/* In sigsuspend state */
454 	int			in_sigsuspend;
455 
456 	/* deferred signal info	*/
457 	siginfo_t		deferred_siginfo;
458 
459 	/* signal mask to restore. */
460 	sigset_t		deferred_sigmask;
461 
462 	/* the sigaction should be used for deferred signal. */
463 	struct sigaction	deferred_sigact;
464 
465 	/* deferred signal delivery is performed, do not reenter. */
466 	int			deferred_run;
467 
468 	/* Force new thread to exit. */
469 	int			force_exit;
470 
471 	/* Thread state: */
472 	enum pthread_state 	state;
473 
474 	/*
475 	 * Error variable used instead of errno. The function __error()
476 	 * returns a pointer to this.
477 	 */
478 	int			error;
479 
480 	/*
481 	 * The joiner is the thread that is joining to this thread.  The
482 	 * join status keeps track of a join operation to another thread.
483 	 */
484 	struct pthread		*joiner;
485 
486 	/* Miscellaneous flags; only set with scheduling lock held. */
487 	int			flags;
488 #define THR_FLAGS_PRIVATE	0x0001
489 #define	THR_FLAGS_NEED_SUSPEND	0x0002	/* thread should be suspended */
490 #define	THR_FLAGS_SUSPENDED	0x0004	/* thread is suspended */
491 #define	THR_FLAGS_DETACHED	0x0008	/* thread is detached */
492 
493 	/* Thread list flags; only set with thread list lock held. */
494 	int			tlflags;
495 #define	TLFLAGS_GC_SAFE		0x0001	/* thread safe for cleaning */
496 #define	TLFLAGS_IN_TDLIST	0x0002	/* thread in all thread list */
497 #define	TLFLAGS_IN_GCLIST	0x0004	/* thread in gc list */
498 
499 	/*
500 	 * Queues of the owned mutexes.  Private queue must have index
501 	 * + 1 of the corresponding full queue.
502 	 */
503 #define	TMQ_NORM		0	/* NORMAL or PRIO_INHERIT normal */
504 #define	TMQ_NORM_PRIV		1	/* NORMAL or PRIO_INHERIT normal priv */
505 #define	TMQ_NORM_PP		2	/* PRIO_PROTECT normal mutexes */
506 #define	TMQ_NORM_PP_PRIV	3	/* PRIO_PROTECT normal priv */
507 #define	TMQ_ROBUST_PP		4	/* PRIO_PROTECT robust mutexes */
508 #define	TMQ_ROBUST_PP_PRIV	5	/* PRIO_PROTECT robust priv */
509 #define	TMQ_NITEMS		6
510 	struct mutex_queue	mq[TMQ_NITEMS];
511 
512 	void				*ret;
513 	struct pthread_specific_elem	*specific;
514 	int				specific_data_count;
515 
516 	/* Number rwlocks rdlocks held. */
517 	int			rdlock_count;
518 
519 	/*
520 	 * Current locks bitmap for rtld. */
521 	int			rtld_bits;
522 
523 	/* Thread control block */
524 	struct tcb		*tcb;
525 
526 	/* Cleanup handlers Link List */
527 	struct pthread_cleanup	*cleanup;
528 
529 #ifdef _PTHREAD_FORCED_UNWIND
530 	struct _Unwind_Exception	ex;
531 	void			*unwind_stackend;
532 	int			unwind_disabled;
533 #endif
534 
535 	/*
536 	 * Magic value to help recognize a valid thread structure
537 	 * from an invalid one:
538 	 */
539 #define	THR_MAGIC		((u_int32_t) 0xd09ba115)
540 	u_int32_t		magic;
541 
542 	/* Enable event reporting */
543 	int			report_events;
544 
545 	/* Event mask */
546 	int			event_mask;
547 
548 	/* Event */
549 	td_event_msg_t		event_buf;
550 
551 	/* Wait channel */
552 	void			*wchan;
553 
554 	/* Referenced mutex. */
555 	struct pthread_mutex	*mutex_obj;
556 
557 	/* Thread will sleep. */
558 	int			will_sleep;
559 
560 	/* Number of threads deferred. */
561 	int			nwaiter_defer;
562 
563 	int			robust_inited;
564 	uintptr_t		robust_list;
565 	uintptr_t		priv_robust_list;
566 	uintptr_t		inact_mtx;
567 
568 	/* Deferred threads from pthread_cond_signal. */
569 	unsigned int 		*defer_waiters[MAX_DEFER_WAITERS];
570 #define _pthread_endzero	wake_addr
571 
572 	struct wake_addr	*wake_addr;
573 #define WAKE_ADDR(td)           ((td)->wake_addr)
574 
575 	/* Sleep queue */
576 	struct	sleepqueue	*sleepqueue;
577 
578 	/* pthread_set/get_name_np */
579 	char			*name;
580 };
581 
582 #define THR_SHOULD_GC(thrd) 						\
583 	((thrd)->refcount == 0 && (thrd)->state == PS_DEAD &&		\
584 	 ((thrd)->flags & THR_FLAGS_DETACHED) != 0)
585 
586 #define	THR_IN_CRITICAL(thrd)				\
587 	(((thrd)->locklevel > 0) ||			\
588 	((thrd)->critical_count > 0))
589 
590 #define	THR_CRITICAL_ENTER(thrd)			\
591 	(thrd)->critical_count++
592 
593 #define	THR_CRITICAL_LEAVE(thrd)			\
594 	do {						\
595 		(thrd)->critical_count--;		\
596 		_thr_ast(thrd);				\
597 	} while (0)
598 
599 #define THR_UMUTEX_TRYLOCK(thrd, lck)			\
600 	_thr_umutex_trylock((lck), TID(thrd))
601 
602 #define	THR_UMUTEX_LOCK(thrd, lck)			\
603 	_thr_umutex_lock((lck), TID(thrd))
604 
605 #define	THR_UMUTEX_TIMEDLOCK(thrd, lck, timo)		\
606 	_thr_umutex_timedlock((lck), TID(thrd), (timo))
607 
608 #define	THR_UMUTEX_UNLOCK(thrd, lck)			\
609 	_thr_umutex_unlock((lck), TID(thrd))
610 
611 #define	THR_LOCK_ACQUIRE(thrd, lck)			\
612 do {							\
613 	(thrd)->locklevel++;				\
614 	_thr_umutex_lock(lck, TID(thrd));		\
615 } while (0)
616 
617 #define	THR_LOCK_ACQUIRE_SPIN(thrd, lck)		\
618 do {							\
619 	(thrd)->locklevel++;				\
620 	_thr_umutex_lock_spin(lck, TID(thrd));		\
621 } while (0)
622 
623 #ifdef	_PTHREADS_INVARIANTS
624 #define	THR_ASSERT_LOCKLEVEL(thrd)			\
625 do {							\
626 	if (__predict_false((thrd)->locklevel <= 0))	\
627 		_thr_assert_lock_level();		\
628 } while (0)
629 #else
630 #define THR_ASSERT_LOCKLEVEL(thrd)
631 #endif
632 
633 #define	THR_LOCK_RELEASE(thrd, lck)			\
634 do {							\
635 	THR_ASSERT_LOCKLEVEL(thrd);			\
636 	_thr_umutex_unlock((lck), TID(thrd));		\
637 	(thrd)->locklevel--;				\
638 	_thr_ast(thrd);					\
639 } while (0)
640 
641 #define	THR_LOCK(curthrd)		THR_LOCK_ACQUIRE(curthrd, &(curthrd)->lock)
642 #define	THR_UNLOCK(curthrd)		THR_LOCK_RELEASE(curthrd, &(curthrd)->lock)
643 #define	THR_THREAD_LOCK(curthrd, thr)	THR_LOCK_ACQUIRE(curthrd, &(thr)->lock)
644 #define	THR_THREAD_UNLOCK(curthrd, thr)	THR_LOCK_RELEASE(curthrd, &(thr)->lock)
645 
646 #define	THREAD_LIST_RDLOCK(curthrd)				\
647 do {								\
648 	(curthrd)->locklevel++;					\
649 	_thr_rwl_rdlock(&_thr_list_lock);			\
650 } while (0)
651 
652 #define	THREAD_LIST_WRLOCK(curthrd)				\
653 do {								\
654 	(curthrd)->locklevel++;					\
655 	_thr_rwl_wrlock(&_thr_list_lock);			\
656 } while (0)
657 
658 #define	THREAD_LIST_UNLOCK(curthrd)				\
659 do {								\
660 	_thr_rwl_unlock(&_thr_list_lock);			\
661 	(curthrd)->locklevel--;					\
662 	_thr_ast(curthrd);					\
663 } while (0)
664 
665 /*
666  * Macros to insert/remove threads to the all thread list and
667  * the gc list.
668  */
669 #define	THR_LIST_ADD(thrd) do {					\
670 	if (((thrd)->tlflags & TLFLAGS_IN_TDLIST) == 0) {	\
671 		TAILQ_INSERT_HEAD(&_thread_list, thrd, tle);	\
672 		_thr_hash_add(thrd);				\
673 		(thrd)->tlflags |= TLFLAGS_IN_TDLIST;		\
674 	}							\
675 } while (0)
676 #define	THR_LIST_REMOVE(thrd) do {				\
677 	if (((thrd)->tlflags & TLFLAGS_IN_TDLIST) != 0) {	\
678 		TAILQ_REMOVE(&_thread_list, thrd, tle);		\
679 		_thr_hash_remove(thrd);				\
680 		(thrd)->tlflags &= ~TLFLAGS_IN_TDLIST;		\
681 	}							\
682 } while (0)
683 #define	THR_GCLIST_ADD(thrd) do {				\
684 	if (((thrd)->tlflags & TLFLAGS_IN_GCLIST) == 0) {	\
685 		TAILQ_INSERT_HEAD(&_thread_gc_list, thrd, gcle);\
686 		(thrd)->tlflags |= TLFLAGS_IN_GCLIST;		\
687 		_gc_count++;					\
688 	}							\
689 } while (0)
690 #define	THR_GCLIST_REMOVE(thrd) do {				\
691 	if (((thrd)->tlflags & TLFLAGS_IN_GCLIST) != 0) {	\
692 		TAILQ_REMOVE(&_thread_gc_list, thrd, gcle);	\
693 		(thrd)->tlflags &= ~TLFLAGS_IN_GCLIST;		\
694 		_gc_count--;					\
695 	}							\
696 } while (0)
697 
698 #define THR_REF_ADD(curthread, pthread) {			\
699 	THR_CRITICAL_ENTER(curthread);				\
700 	pthread->refcount++;					\
701 } while (0)
702 
703 #define THR_REF_DEL(curthread, pthread) {			\
704 	pthread->refcount--;					\
705 	THR_CRITICAL_LEAVE(curthread);				\
706 } while (0)
707 
708 #define GC_NEEDED()	(_gc_count >= 5)
709 
710 #define SHOULD_REPORT_EVENT(curthr, e)			\
711 	(curthr->report_events && 			\
712 	 (((curthr)->event_mask | _thread_event_mask ) & e) != 0)
713 
714 #ifndef __LIBC_ISTHREADED_DECLARED
715 #define __LIBC_ISTHREADED_DECLARED
716 extern int __isthreaded;
717 #endif
718 
719 /*
720  * Global variables for the pthread kernel.
721  */
722 
723 extern char		*_usrstack __hidden;
724 
725 /* For debugger */
726 extern int		_libthr_debug;
727 extern int		_thread_event_mask;
728 extern struct pthread	*_thread_last_event;
729 /* Used in symbol lookup of libthread_db */
730 extern struct pthread_key	_thread_keytable[];
731 
732 /* List of all threads: */
733 extern pthreadlist	_thread_list;
734 
735 /* List of threads needing GC: */
736 extern pthreadlist	_thread_gc_list __hidden;
737 
738 extern int		_thread_active_threads;
739 extern atfork_head	_thr_atfork_list __hidden;
740 extern struct urwlock	_thr_atfork_lock __hidden;
741 
742 /* Default thread attributes: */
743 extern struct pthread_attr _pthread_attr_default __hidden;
744 
745 /* Default mutex attributes: */
746 extern struct pthread_mutex_attr _pthread_mutexattr_default __hidden;
747 extern struct pthread_mutex_attr _pthread_mutexattr_adaptive_default __hidden;
748 
749 /* Default condition variable attributes: */
750 extern struct pthread_cond_attr _pthread_condattr_default __hidden;
751 
752 extern struct pthread_prio _thr_priorities[] __hidden;
753 
754 extern int	_thr_is_smp __hidden;
755 
756 extern size_t	_thr_guard_default __hidden;
757 extern size_t	_thr_stack_default __hidden;
758 extern size_t	_thr_stack_initial __hidden;
759 extern int	_thr_page_size __hidden;
760 extern int	_thr_spinloops __hidden;
761 extern int	_thr_yieldloops __hidden;
762 extern int	_thr_queuefifo __hidden;
763 
764 /* Garbage thread count. */
765 extern int	_gc_count __hidden;
766 
767 extern struct umutex	_mutex_static_lock __hidden;
768 extern struct umutex	_cond_static_lock __hidden;
769 extern struct umutex	_rwlock_static_lock __hidden;
770 extern struct umutex	_keytable_lock __hidden;
771 extern struct urwlock	_thr_list_lock __hidden;
772 extern struct umutex	_thr_event_lock __hidden;
773 extern struct umutex	_suspend_all_lock __hidden;
774 extern int		_suspend_all_waiters __hidden;
775 extern int		_suspend_all_cycle __hidden;
776 extern struct pthread	*_single_thread __hidden;
777 
778 /*
779  * Function prototype definitions.
780  */
781 __BEGIN_DECLS
782 void	_thr_setthreaded(int) __hidden;
783 int	_mutex_cv_lock(struct pthread_mutex *, int, bool) __hidden;
784 int	_mutex_cv_unlock(struct pthread_mutex *, int *, int *) __hidden;
785 int     _mutex_cv_attach(struct pthread_mutex *, int) __hidden;
786 int     _mutex_cv_detach(struct pthread_mutex *, int *) __hidden;
787 int     _mutex_owned(struct pthread *, const struct pthread_mutex *) __hidden;
788 int	_mutex_reinit(pthread_mutex_t *) __hidden;
789 void	_mutex_fork(struct pthread *curthread) __hidden;
790 int	_mutex_enter_robust(struct pthread *curthread, struct pthread_mutex *m)
791 	    __hidden;
792 void	_mutex_leave_robust(struct pthread *curthread, struct pthread_mutex *m)
793 	    __hidden;
794 void	_libpthread_init(struct pthread *) __hidden;
795 struct pthread *_thr_alloc(struct pthread *) __hidden;
796 void	_thread_exit(const char *, int, const char *) __hidden __dead2;
797 void	_thread_exitf(const char *, int, const char *, ...) __hidden __dead2
798 	    __printflike(3, 4);
799 int	_thr_ref_add(struct pthread *, struct pthread *, int) __hidden;
800 void	_thr_ref_delete(struct pthread *, struct pthread *) __hidden;
801 void	_thr_ref_delete_unlocked(struct pthread *, struct pthread *) __hidden;
802 int	_thr_find_thread(struct pthread *, struct pthread *, int) __hidden;
803 void	_thr_rtld_init(void) __hidden;
804 void	_thr_rtld_postfork_child(void) __hidden;
805 int	_thr_stack_alloc(struct pthread_attr *) __hidden;
806 void	_thr_stack_free(struct pthread_attr *) __hidden;
807 void	_thr_free(struct pthread *, struct pthread *) __hidden;
808 void	_thr_gc(struct pthread *) __hidden;
809 void    _thread_cleanupspecific(void) __hidden;
810 void	_thread_printf(int, const char *, ...) __hidden __printflike(2, 3);
811 void	_thread_vprintf(int, const char *, va_list) __hidden;
812 void	_thr_spinlock_init(void) __hidden;
813 void	_thr_cancel_enter(struct pthread *) __hidden;
814 void	_thr_cancel_enter2(struct pthread *, int) __hidden;
815 void	_thr_cancel_leave(struct pthread *, int) __hidden;
816 void	_thr_testcancel(struct pthread *) __hidden;
817 void	_thr_signal_block(struct pthread *) __hidden;
818 void	_thr_signal_unblock(struct pthread *) __hidden;
819 void	_thr_signal_block_check_fast(void) __hidden;
820 void	_thr_signal_block_setup(struct pthread *) __hidden;
821 void	_thr_signal_init(int) __hidden;
822 void	_thr_signal_deinit(void) __hidden;
823 int	_thr_send_sig(struct pthread *, int sig) __hidden;
824 void	_thr_list_init(void) __hidden;
825 void	_thr_hash_add(struct pthread *) __hidden;
826 void	_thr_hash_remove(struct pthread *) __hidden;
827 struct pthread *_thr_hash_find(struct pthread *) __hidden;
828 void	_thr_link(struct pthread *, struct pthread *) __hidden;
829 void	_thr_unlink(struct pthread *, struct pthread *) __hidden;
830 void	_thr_assert_lock_level(void) __hidden __dead2;
831 void	_thr_ast(struct pthread *) __hidden;
832 void	_thr_report_creation(struct pthread *curthread,
833 	    struct pthread *newthread) __hidden;
834 void	_thr_report_death(struct pthread *curthread) __hidden;
835 int	_thr_getscheduler(lwpid_t, int *, struct sched_param *) __hidden;
836 int	_thr_setscheduler(lwpid_t, int, const struct sched_param *) __hidden;
837 void	_thr_signal_prefork(void) __hidden;
838 void	_thr_signal_postfork(void) __hidden;
839 void	_thr_signal_postfork_child(void) __hidden;
840 void	_thr_suspend_all_lock(struct pthread *) __hidden;
841 void	_thr_suspend_all_unlock(struct pthread *) __hidden;
842 void	_thr_try_gc(struct pthread *, struct pthread *) __hidden;
843 int	_rtp_to_schedparam(const struct rtprio *rtp, int *policy,
844 		struct sched_param *param) __hidden;
845 int	_schedparam_to_rtp(int policy, const struct sched_param *param,
846 		struct rtprio *rtp) __hidden;
847 void	_thread_bp_create(void);
848 void	_thread_bp_death(void);
849 int	_sched_yield(void);
850 
851 void	_pthread_cleanup_push(void (*)(void *), void *);
852 void	_pthread_cleanup_pop(int);
853 void	_pthread_exit_mask(void *status, sigset_t *mask) __dead2 __hidden;
854 #ifndef _LIBC_PRIVATE_H_
855 void	_pthread_cancel_enter(int maycancel);
856 void 	_pthread_cancel_leave(int maycancel);
857 #endif
858 int	_pthread_mutex_consistent(pthread_mutex_t * _Nonnull);
859 int	_pthread_mutexattr_getrobust(pthread_mutexattr_t * _Nonnull __restrict,
860 	    int * _Nonnull __restrict);
861 int	_pthread_mutexattr_setrobust(pthread_mutexattr_t * _Nonnull, int);
862 
863 /* #include <fcntl.h> */
864 #ifdef  _SYS_FCNTL_H_
865 #ifndef _LIBC_PRIVATE_H_
866 int     __sys_fcntl(int, int, ...);
867 int     __sys_openat(int, const char *, int, ...);
868 #endif /* _LIBC_PRIVATE_H_ */
869 #endif /* _SYS_FCNTL_H_ */
870 
871 /* #include <signal.h> */
872 #ifdef _SIGNAL_H_
873 #ifndef _LIBC_PRIVATE_H_
874 int     __sys_sigaction(int, const struct sigaction *, struct sigaction *);
875 int     __sys_sigprocmask(int, const sigset_t *, sigset_t *);
876 int     __sys_sigsuspend(const sigset_t *);
877 int	__sys_sigtimedwait(const sigset_t *, siginfo_t *,
878 		const struct timespec *);
879 int	__sys_sigwait(const sigset_t *, int *);
880 int	__sys_sigwaitinfo(const sigset_t *set, siginfo_t *info);
881 #endif /* _LIBC_PRIVATE_H_ */
882 #endif /* _SYS_FCNTL_H_ */
883 
884 /* #include <time.h> */
885 #ifdef	_TIME_H_
886 #ifndef _LIBC_PRIVATE_H_
887 int	__sys_clock_nanosleep(clockid_t, int, const struct timespec *,
888 	    struct timespec *);
889 int	__sys_nanosleep(const struct timespec *, struct timespec *);
890 #endif /* _LIBC_PRIVATE_H_ */
891 #endif /* _SYS_FCNTL_H_ */
892 
893 /* #include <sys/ucontext.h> */
894 #ifdef _SYS_UCONTEXT_H_
895 #ifndef _LIBC_PRIVATE_H_
896 int	__sys_setcontext(const ucontext_t *ucp);
897 int	__sys_swapcontext(ucontext_t *oucp, const ucontext_t *ucp);
898 #endif /* _LIBC_PRIVATE_H_ */
899 #endif /* _SYS_FCNTL_H_ */
900 
901 /* #include <unistd.h> */
902 #ifdef  _UNISTD_H_
903 #ifndef _LIBC_PRIVATE_H_
904 int     __sys_close(int);
905 int	__sys_fork(void);
906 ssize_t __sys_read(int, void *, size_t);
907 #endif /* _LIBC_PRIVATE_H_ */
908 #endif /* _SYS_FCNTL_H_ */
909 
910 static inline int
911 _thr_isthreaded(void)
912 {
913 	return (__isthreaded != 0);
914 }
915 
916 static inline int
917 _thr_is_inited(void)
918 {
919 	return (_thr_initial != NULL);
920 }
921 
922 static inline void
923 _thr_check_init(void)
924 {
925 	if (_thr_initial == NULL)
926 		_libpthread_init(NULL);
927 }
928 
929 struct wake_addr *_thr_alloc_wake_addr(void);
930 void	_thr_release_wake_addr(struct wake_addr *);
931 int	_thr_sleep(struct pthread *, int, const struct timespec *);
932 
933 void _thr_wake_addr_init(void) __hidden;
934 
935 static inline void
936 _thr_clear_wake(struct pthread *td)
937 {
938 	td->wake_addr->value = 0;
939 }
940 
941 static inline int
942 _thr_is_woken(struct pthread *td)
943 {
944 	return td->wake_addr->value != 0;
945 }
946 
947 static inline void
948 _thr_set_wake(unsigned int *waddr)
949 {
950 	*waddr = 1;
951 	_thr_umtx_wake(waddr, INT_MAX, 0);
952 }
953 
954 void _thr_wake_all(unsigned int *waddrs[], int) __hidden;
955 
956 static inline struct pthread *
957 _sleepq_first(struct sleepqueue *sq)
958 {
959 	return TAILQ_FIRST(&sq->sq_blocked);
960 }
961 
962 void	_sleepq_init(void) __hidden;
963 struct sleepqueue *_sleepq_alloc(void) __hidden;
964 void	_sleepq_free(struct sleepqueue *) __hidden;
965 void	_sleepq_lock(void *) __hidden;
966 void	_sleepq_unlock(void *) __hidden;
967 struct sleepqueue *_sleepq_lookup(void *) __hidden;
968 void	_sleepq_add(void *, struct pthread *) __hidden;
969 int	_sleepq_remove(struct sleepqueue *, struct pthread *) __hidden;
970 void	_sleepq_drop(struct sleepqueue *,
971 		void (*cb)(struct pthread *, void *arg), void *) __hidden;
972 
973 int	_pthread_mutex_init_calloc_cb(pthread_mutex_t *mutex,
974 	    void *(calloc_cb)(size_t, size_t));
975 
976 struct dl_phdr_info;
977 void __pthread_cxa_finalize(struct dl_phdr_info *phdr_info);
978 void _thr_tsd_unload(struct dl_phdr_info *phdr_info) __hidden;
979 void _thr_sigact_unload(struct dl_phdr_info *phdr_info) __hidden;
980 void _thr_stack_fix_protection(struct pthread *thrd);
981 void __pthread_distribute_static_tls(size_t offset, void *src, size_t len,
982     size_t total_len);
983 
984 int *__error_threaded(void) __hidden;
985 void __thr_interpose_libc(void) __hidden;
986 pid_t __thr_fork(void);
987 pid_t __thr_pdfork(int *, int);
988 int __thr_setcontext(const ucontext_t *ucp);
989 int __thr_sigaction(int sig, const struct sigaction *act,
990     struct sigaction *oact) __hidden;
991 int __thr_sigprocmask(int how, const sigset_t *set, sigset_t *oset);
992 int __thr_sigsuspend(const sigset_t * set);
993 int __thr_sigtimedwait(const sigset_t *set, siginfo_t *info,
994     const struct timespec * timeout);
995 int __thr_sigwait(const sigset_t *set, int *sig);
996 int __thr_sigwaitinfo(const sigset_t *set, siginfo_t *info);
997 int __thr_swapcontext(ucontext_t *oucp, const ucontext_t *ucp);
998 
999 void __thr_map_stacks_exec(void);
1000 
1001 struct _spinlock;
1002 void __thr_spinunlock(struct _spinlock *lck);
1003 void __thr_spinlock(struct _spinlock *lck);
1004 
1005 struct tcb *_tcb_ctor(struct pthread *, int);
1006 void	_tcb_dtor(struct tcb *);
1007 
1008 void __thr_pshared_init(void) __hidden;
1009 void *__thr_pshared_offpage(void *key, int doalloc) __hidden;
1010 void __thr_pshared_destroy(void *key) __hidden;
1011 void __thr_pshared_atfork_pre(void) __hidden;
1012 void __thr_pshared_atfork_post(void) __hidden;
1013 
1014 void *__thr_calloc(size_t num, size_t size);
1015 void __thr_free(void *cp);
1016 void *__thr_malloc(size_t nbytes);
1017 void *__thr_realloc(void *cp, size_t nbytes);
1018 void __thr_malloc_init(void);
1019 void __thr_malloc_prefork(struct pthread *curthread);
1020 void __thr_malloc_postfork(struct pthread *curthread);
1021 
1022 int _thr_join(pthread_t, void **);
1023 int _Tthr_kill(pthread_t, int);
1024 int _thr_getthreadid_np(void);
1025 void __thr_cleanup_push_imp(void (*)(void *), void *,
1026     struct _pthread_cleanup_info *);
1027 void __thr_cleanup_pop_imp(int);
1028 void _thr_cleanup_push(void (*)(void *), void *);
1029 void _thr_cleanup_pop(int);
1030 void _Tthr_testcancel(void);
1031 void _Tthr_cancel_enter(int);
1032 void _Tthr_cancel_leave(int);
1033 int _thr_cancel(pthread_t);
1034 int _thr_atfork(void (*)(void), void (*)(void), void (*)(void));
1035 int _thr_attr_destroy(pthread_attr_t *);
1036 int _thr_attr_get_np(pthread_t, pthread_attr_t *);
1037 int _thr_attr_getdetachstate(const pthread_attr_t *, int *);
1038 int _thr_attr_getguardsize(const pthread_attr_t * __restrict,
1039     size_t * __restrict);
1040 int _thr_attr_getinheritsched(const pthread_attr_t * __restrict,
1041     int * __restrict);
1042 int _thr_attr_getschedparam(const pthread_attr_t * __restrict,
1043     struct sched_param * __restrict);
1044 int _thr_attr_getschedpolicy(const pthread_attr_t * __restrict,
1045     int * __restrict);
1046 int _thr_attr_getscope(const pthread_attr_t * __restrict, int * __restrict);
1047 int _thr_attr_getstackaddr(const pthread_attr_t *, void **);
1048 int _thr_attr_getstacksize(const pthread_attr_t * __restrict,
1049     size_t * __restrict);
1050 int _thr_attr_init(pthread_attr_t *);
1051 int _thr_attr_setdetachstate(pthread_attr_t *, int);
1052 int _thr_attr_setguardsize(pthread_attr_t *, size_t);
1053 int _thr_attr_setinheritsched(pthread_attr_t *, int);
1054 int _thr_attr_setschedparam(pthread_attr_t * __restrict,
1055     const struct sched_param * __restrict);
1056 int _thr_attr_setschedpolicy(pthread_attr_t *, int);
1057 int _thr_attr_setscope(pthread_attr_t *, int);
1058 int _thr_attr_setstackaddr(pthread_attr_t *, void *);
1059 int _thr_attr_setstacksize(pthread_attr_t *, size_t);
1060 int _thr_cond_init(pthread_cond_t * __restrict,
1061     const pthread_condattr_t * __restrict);
1062 int _thr_cond_destroy(pthread_cond_t *);
1063 int _thr_cond_timedwait(pthread_cond_t * __restrict,
1064     pthread_mutex_t * __restrict, const struct timespec * __restrict);
1065 int _thr_cond_signal(pthread_cond_t * cond);
1066 int _thr_cond_broadcast(pthread_cond_t * cond);
1067 int __thr_cond_wait(pthread_cond_t *, pthread_mutex_t *);
1068 int _thr_cond_wait(pthread_cond_t *, pthread_mutex_t *);
1069 int _thr_detach(pthread_t);
1070 int _thr_equal(pthread_t, pthread_t);
1071 void _Tthr_exit(void *);
1072 int _thr_key_create(pthread_key_t *, void (*)(void *));
1073 int _thr_key_delete(pthread_key_t);
1074 int _thr_setspecific(pthread_key_t, const void *);
1075 void *_thr_getspecific(pthread_key_t);
1076 int _thr_setcancelstate(int, int *);
1077 int _thr_setcanceltype(int, int *);
1078 pthread_t _Tthr_self(void);
1079 int _thr_rwlock_init(pthread_rwlock_t *, const pthread_rwlockattr_t *);
1080 int _thr_rwlock_destroy(pthread_rwlock_t *);
1081 int _Tthr_rwlock_rdlock(pthread_rwlock_t *);
1082 int _Tthr_rwlock_tryrdlock(pthread_rwlock_t *);
1083 int _Tthr_rwlock_trywrlock(pthread_rwlock_t *);
1084 int _Tthr_rwlock_wrlock(pthread_rwlock_t *);
1085 int _Tthr_rwlock_unlock(pthread_rwlock_t *);
1086 int _thr_once(pthread_once_t *, void (*)(void));
1087 int _thr_sigmask(int, const sigset_t *, sigset_t *);
1088 int _thr_main_np(void);
1089 int _thr_mutexattr_init(pthread_mutexattr_t *);
1090 int _thr_mutexattr_destroy(pthread_mutexattr_t *);
1091 int _thr_mutexattr_settype(pthread_mutexattr_t *, int);
1092 int _thr_mutexattr_getrobust(pthread_mutexattr_t *, int *);
1093 int _thr_mutexattr_setrobust(pthread_mutexattr_t *, int);
1094 int __Tthr_mutex_init(pthread_mutex_t * __restrict,
1095     const pthread_mutexattr_t * __restrict);
1096 int _Tthr_mutex_consistent(pthread_mutex_t *);
1097 int _thr_mutex_destroy(pthread_mutex_t *);
1098 int _thr_mutex_unlock(pthread_mutex_t *);
1099 int __Tthr_mutex_lock(pthread_mutex_t *);
1100 int __Tthr_mutex_trylock(pthread_mutex_t *);
1101 
1102 __END_DECLS
1103 __NULLABILITY_PRAGMA_POP
1104 
1105 #endif  /* !_THR_PRIVATE_H */
1106