xref: /titanic_51/usr/src/lib/libc/inc/thr_uberdata.h (revision 61dc244f52b4962ea505abec7e6cbade980d3c53)
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 (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
24  */
25 
26 #ifndef _THR_UBERDATA_H
27 #define	_THR_UBERDATA_H
28 
29 #include <stdlib.h>
30 #include <unistd.h>
31 #include <sys/types.h>
32 #include <fcntl.h>
33 #include <string.h>
34 #include <signal.h>
35 #include <ucontext.h>
36 #include <thread.h>
37 #include <pthread.h>
38 #include <atomic.h>
39 #include <link.h>
40 #include <sys/resource.h>
41 #include <sys/lwp.h>
42 #include <errno.h>
43 #include <sys/asm_linkage.h>
44 #include <sys/regset.h>
45 #include <sys/fcntl.h>
46 #include <sys/mman.h>
47 #include <synch.h>
48 #include <door.h>
49 #include <limits.h>
50 #include <sys/synch32.h>
51 #include <schedctl.h>
52 #include <sys/priocntl.h>
53 #include <thread_db.h>
54 #include <setjmp.h>
55 #include "libc_int.h"
56 #include "tdb_agent.h"
57 #include "thr_debug.h"
58 
59 /*
60  * This is an implementation-specific include file for threading support.
61  * It is not to be seen by the clients of the library.
62  *
63  * This file also describes uberdata in libc.
64  *
65  * The term "uberdata" refers to data that is unique and visible across
66  * all link maps.  The name is meant to imply that such data is truly
67  * global, not just locally global to a particular link map.
68  *
69  * See the Linker and Libraries Guide for a full description of alternate
70  * link maps and how they are set up and used.
71  *
72  * Alternate link maps implement multiple global namespaces within a single
73  * process.  There may be multiple instances of identical dynamic libraries
74  * loaded in a process's address space at the same time, each on a different
75  * link map (as determined by the dynamic linker), each with its own set of
76  * global variables.  Which particular instance of a global variable is seen
77  * by a thread running in the process is determined by the link map on which
78  * the thread happens to be executing at the time.
79  *
80  * However, there are aspects of a process that are unique across all
81  * link maps, in particular the structures used to implement threads
82  * of control (in Sparc terminology, there is only one %g7 regardless
83  * of the link map on which the thread is executing).
84  *
85  * All uberdata is referenced from a base pointer in the thread's ulwp_t
86  * structure (which is also uberdata).  All allocations and deallocations
87  * of uberdata are made via the uberdata-aware lmalloc() and lfree()
88  * interfaces (malloc() and free() are simply locally-global).
89  */
90 
91 /*
92  * Special libc-private access to errno.
93  * We do this so that references to errno do not invoke the dynamic linker.
94  */
95 #undef errno
96 #define	errno (*curthread->ul_errnop)
97 
98 /*
99  * See <sys/synch32.h> for the reasons for these values
100  * and why they are different for sparc and intel.
101  */
102 #if defined(__sparc)
103 
104 /* lock.lock64.pad[x]	   4 5 6 7 */
105 #define	LOCKMASK	0xff000000
106 #define	WAITERMASK	0x000000ff
107 #define	SPINNERMASK	0x00ff0000
108 #define	SPINNERSHIFT	16
109 #define	WAITER		0x00000001
110 #define	LOCKSET		0xff
111 #define	LOCKCLEAR	0
112 
113 #define	PIDSHIFT	32
114 #define	LOCKMASK64	0xffffffffff000000ULL
115 #define	LOCKBYTE64	0x00000000ff000000ULL
116 #define	WAITERMASK64	0x00000000000000ffULL
117 #define	SPINNERMASK64	0x0000000000ff0000ULL
118 
119 #elif defined(__x86)
120 
121 /* lock.lock64.pad[x]	   7 6 5 4 */
122 #define	LOCKMASK	0xff000000
123 #define	WAITERMASK	0x00ff0000
124 #define	SPINNERMASK	0x0000ff00
125 #define	SPINNERSHIFT	8
126 #define	WAITER		0x00010000
127 #define	LOCKSET		0x01
128 #define	LOCKCLEAR	0
129 
130 #define	PIDSHIFT	0
131 #define	LOCKMASK64	0xff000000ffffffffULL
132 #define	LOCKBYTE64	0x0100000000000000ULL
133 #define	WAITERMASK64	0x00ff000000000000ULL
134 #define	SPINNERMASK64	0x0000ff0000000000ULL
135 
136 #else
137 #error "neither __sparc nor __x86 is defined"
138 #endif
139 
140 /*
141  * Fetch the owner of a USYNC_THREAD mutex.
142  * Don't use this with process-shared mutexes;
143  * the owing thread may be in a different process.
144  */
145 #define	MUTEX_OWNER(mp)	((ulwp_t *)(uintptr_t)(mp)->mutex_owner)
146 
147 /*
148  * Test if a thread owns a process-private (USYNC_THREAD) mutex.
149  * This is inappropriate for a process-shared (USYNC_PROCESS) mutex.
150  * The 'mp' argument must not have side-effects since it is evaluated twice.
151  */
152 #define	MUTEX_OWNED(mp, thrp)	\
153 	((mp)->mutex_lockw != 0 && MUTEX_OWNER(mp) == thrp)
154 
155 
156 /*
157  * uberflags.uf_tdb_register_sync is an interface with libc_db to enable the
158  * collection of lock statistics by a debugger or other collecting tool.
159  *
160  * uberflags.uf_thread_error_detection is set by an environment variable:
161  *	_THREAD_ERROR_DETECTION
162  *		0 == no detection of locking primitive errors.
163  *		1 == detect errors and issue a warning message.
164  *		2 == detect errors, issue a warning message, and dump core.
165  *
166  * We bundle these together in uberflags.uf_trs_ted to make a test of either
167  * being non-zero a single memory reference (for speed of mutex_lock(), etc).
168  *
169  * uberflags.uf_mt is set non-zero when the first thread (in addition
170  * to the main thread) is created.
171  *
172  * We bundle all these flags together in uberflags.uf_all to make a test
173  * of any being non-zero a single memory reference (again, for speed).
174  */
175 typedef union {
176 	int	uf_all;			/* combined all flags */
177 	struct {
178 		short	h_pad;
179 		short	h_trs_ted;	/* combined reg sync & error detect */
180 	} uf_h;
181 	struct {
182 		char	x_mt;
183 		char	x_pad;
184 		char	x_tdb_register_sync;
185 		char	x_thread_error_detection;
186 	} uf_x;
187 } uberflags_t;
188 
189 #define	uf_mt				uf_x.x_mt
190 #define	uf_tdb_register_sync		uf_x.x_tdb_register_sync
191 #define	uf_thread_error_detection	uf_x.x_thread_error_detection
192 #define	uf_trs_ted			uf_h.h_trs_ted	/* both of the above */
193 
194 /*
195  * NOTE WELL:
196  * To enable further optimization, the "ul_schedctl_called" member
197  * of the ulwp_t structure (below) serves double-duty:
198  *	1. If NULL, it means that the thread must call __schedctl()
199  *	   to set up its schedctl mappings before acquiring a mutex.
200  *	   This is required by the implementation of adaptive mutex locking.
201  *	2. If non-NULL, it points to uberdata.uberflags, so that tests of
202  *	   uberflags can be made without additional memory references.
203  * This allows the common case of _mutex_lock() and _mutex_unlock() for
204  * USYNC_THREAD mutexes with no error detection and no lock statistics
205  * to be optimized for speed.
206  */
207 
208 /* double the default stack size for 64-bit processes */
209 #ifdef _LP64
210 #define	MINSTACK	(8 * 1024)
211 #define	DEFAULTSTACK	(2 * 1024 * 1024)
212 #else
213 #define	MINSTACK	(4 * 1024)
214 #define	DEFAULTSTACK	(1024 * 1024)
215 #endif
216 
217 #define	MUTEX_TRY	0
218 #define	MUTEX_LOCK	1
219 #define	MUTEX_NOCEIL	0x40
220 
221 #if defined(__x86)
222 
223 typedef struct {	/* structure returned by fnstenv */
224 	int	fctrl;		/* control word */
225 	int	fstat;		/* status word (flags, etc) */
226 	int	ftag;		/* tag of which regs busy */
227 	int	misc[4];	/* other stuff, 28 bytes total */
228 } fpuenv_t;
229 
230 #ifdef _SYSCALL32
231 typedef fpuenv_t fpuenv32_t;
232 #endif	/* _SYSCALL32 */
233 
234 #elif defined(__sparc)
235 
236 typedef struct {	/* fp state structure */
237 	greg_t	fsr;
238 	greg_t	fpu_en;
239 } fpuenv_t;
240 
241 #ifdef _SYSCALL32
242 typedef struct {
243 	greg32_t	fsr;
244 	greg32_t	fpu_en;
245 } fpuenv32_t;
246 #endif	/* _SYSCALL32 */
247 
248 #endif	/* __x86 */
249 
250 #if defined(__x86)
251 extern	void	ht_pause(void);		/* "pause" instruction */
252 #define	SMT_PAUSE()	ht_pause()
253 #elif defined(SMT_PAUSE_FUNCTION)
254 extern	void	SMT_PAUSE_FUNCTION(void);
255 #define	SMT_PAUSE()	SMT_PAUSE_FUNCTION()
256 #else
257 #define	SMT_PAUSE()	smt_pause()
258 #endif	/* __x86 */
259 
260 /*
261  * Cleanup handler related data.
262  * This structure is exported as _cleanup_t in pthread.h.
263  * pthread.h exports only the size of this structure, so check
264  * _cleanup_t in pthread.h before making any change here.
265  */
266 typedef struct __cleanup {
267 	struct __cleanup *next;		/* pointer to next handler */
268 	caddr_t	fp;			/* current frame pointer */
269 	void	(*func)(void *);	/* cleanup handler address */
270 	void	*arg;			/* handler's argument */
271 } __cleanup_t;
272 
273 /*
274  * Thread-Specific Data (TSD)
275  * TSD_NFAST includes the invalid key zero, so there
276  * are really only (TSD_NFAST - 1) fast key slots.
277  */
278 typedef	void (*PFrV)(void *);
279 #define	TSD_UNALLOCATED	((PFrV)1)
280 #define	TSD_NFAST	9
281 
282 /*
283  * The tsd union is designed to burn a little memory (9 words) to make
284  * lookups blindingly fast.  Note that tsd_nalloc could be placed at the
285  * end of the pad region to increase the likelihood that it falls on the
286  * same cache line as the data.
287  */
288 typedef union tsd {
289 	uint_t tsd_nalloc;		/* Amount of allocated storage */
290 	void *tsd_pad[TSD_NFAST];
291 	void *tsd_data[1];
292 } tsd_t;
293 
294 typedef struct {
295 	mutex_t tsdm_lock;		/* Lock protecting the data */
296 	uint_t tsdm_nkeys;		/* Number of allocated keys */
297 	uint_t tsdm_nused;		/* Number of used keys */
298 	PFrV *tsdm_destro;		/* Per-key destructors */
299 	char tsdm_pad[64 -		/* pad to 64 bytes */
300 		(sizeof (mutex_t) + 2 * sizeof (uint_t) + sizeof (PFrV *))];
301 } tsd_metadata_t;
302 
303 #ifdef _SYSCALL32
304 typedef union tsd32 {
305 	uint_t tsd_nalloc;		/* Amount of allocated storage */
306 	caddr32_t tsd_pad[TSD_NFAST];
307 	caddr32_t tsd_data[1];
308 } tsd32_t;
309 
310 typedef struct {
311 	mutex_t tsdm_lock;		/* Lock protecting the data */
312 	uint_t tsdm_nkeys;		/* Number of allocated keys */
313 	uint_t tsdm_nused;		/* Number of used keys */
314 	caddr32_t tsdm_destro;		/* Per-key destructors */
315 	char tsdm_pad[64 -		/* pad to 64 bytes */
316 		(sizeof (mutex_t) + 2 * sizeof (uint_t) + sizeof (caddr32_t))];
317 } tsd_metadata32_t;
318 #endif	/* _SYSCALL32 */
319 
320 
321 /*
322  * Thread-Local Storage (TLS)
323  */
324 typedef struct {
325 	void		*tls_data;
326 	size_t		tls_size;
327 } tls_t;
328 
329 typedef struct {
330 	mutex_t	tls_lock;		/* Lock protecting the data */
331 	tls_t	tls_modinfo;		/* Root of all TLS_modinfo data */
332 	tls_t	static_tls;		/* Template for static TLS */
333 	char	tls_pad[64 -		/* pad to 64 bytes */
334 		(sizeof (mutex_t) + 2 * sizeof (tls_t))];
335 } tls_metadata_t;
336 
337 #ifdef _SYSCALL32
338 typedef struct {
339 	caddr32_t	tls_data;
340 	size32_t	tls_size;
341 } tls32_t;
342 
343 typedef struct {
344 	mutex_t	tls_lock;		/* Lock protecting the data */
345 	tls32_t	tls_modinfo;		/* Root of all TLS_modinfo data */
346 	tls32_t	static_tls;		/* Template for static TLS */
347 	char	tls_pad[64 -		/* pad to 64 bytes */
348 		(sizeof (mutex_t) + 2 * sizeof (tls32_t))];
349 } tls_metadata32_t;
350 #endif	/* _SYSCALL32 */
351 
352 
353 /*
354  * Sleep queue root for USYNC_THREAD condvars and mutexes.
355  * There is a default queue root for each queue head (see below).
356  * Also, each ulwp_t contains a queue root that can be used
357  * when the thread is enqueued on the queue, if necessary
358  * (when more than one wchan hashes to the same queue head).
359  */
360 typedef struct queue_root {
361 	struct queue_root	*qr_next;
362 	struct queue_root	*qr_prev;
363 	struct ulwp		*qr_head;
364 	struct ulwp		*qr_tail;
365 	void			*qr_wchan;
366 	uint32_t		qr_rtcount;
367 	uint32_t		qr_qlen;
368 	uint32_t		qr_qmax;
369 } queue_root_t;
370 
371 #ifdef _SYSCALL32
372 typedef struct queue_root32 {
373 	caddr32_t		qr_next;
374 	caddr32_t		qr_prev;
375 	caddr32_t		qr_head;
376 	caddr32_t		qr_tail;
377 	caddr32_t		qr_wchan;
378 	uint32_t		qr_rtcount;
379 	uint32_t		qr_qlen;
380 	uint32_t		qr_qmax;
381 } queue_root32_t;
382 #endif
383 
384 /*
385  * Sleep queue heads for USYNC_THREAD condvars and mutexes.
386  * The size and alignment is 128 bytes to reduce cache conflicts.
387  * Each queue head points to a list of queue roots, defined above.
388  * Each queue head contains a default queue root for use when only one
389  * is needed.  It is always at the tail of the queue root hash chain.
390  */
391 typedef union {
392 	uint64_t		qh_64[16];
393 	struct {
394 		mutex_t		q_lock;
395 		uint8_t		q_qcnt;
396 		uint8_t		q_type;		/* MX or CV */
397 		uint8_t		q_pad1[2];
398 		uint32_t	q_lockcount;
399 		uint32_t	q_qlen;
400 		uint32_t	q_qmax;
401 		void		*q_wchan;	/* valid only while locked */
402 		struct queue_root *q_root;	/* valid only while locked */
403 		struct queue_root *q_hlist;
404 #if !defined(_LP64)
405 		caddr_t		q_pad2[3];
406 #endif
407 		queue_root_t	q_def_root;
408 		uint32_t	q_hlen;
409 		uint32_t	q_hmax;
410 	} qh_qh;
411 } queue_head_t;
412 
413 #define	qh_lock		qh_qh.q_lock
414 #define	qh_qcnt		qh_qh.q_qcnt
415 #define	qh_type		qh_qh.q_type
416 #if defined(THREAD_DEBUG)
417 #define	qh_lockcount	qh_qh.q_lockcount
418 #define	qh_qlen		qh_qh.q_qlen
419 #define	qh_qmax		qh_qh.q_qmax
420 #endif
421 #define	qh_wchan	qh_qh.q_wchan
422 #define	qh_root		qh_qh.q_root
423 #define	qh_hlist	qh_qh.q_hlist
424 #define	qh_def_root	qh_qh.q_def_root
425 #define	qh_hlen		qh_qh.q_hlen
426 #define	qh_hmax		qh_qh.q_hmax
427 
428 /* queue types passed to queue_lock() */
429 #define	MX	0
430 #define	CV	1
431 #define	QHASHSHIFT	9			/* number of hashing bits */
432 #define	QHASHSIZE	(1 << QHASHSHIFT)	/* power of 2 (1<<9 == 512) */
433 #define	QUEUE_HASH(wchan, type)	((uint_t)			\
434 	((((uintptr_t)(wchan) >> 3)				\
435 	^ ((uintptr_t)(wchan) >> (QHASHSHIFT + 3)))		\
436 	& (QHASHSIZE - 1)) + (((type) == MX)? 0 : QHASHSIZE))
437 
438 extern	queue_head_t	*queue_lock(void *, int);
439 extern	void		queue_unlock(queue_head_t *);
440 extern	void		enqueue(queue_head_t *, struct ulwp *, int);
441 extern	struct ulwp	*dequeue(queue_head_t *, int *);
442 extern	struct ulwp	**queue_slot(queue_head_t *, struct ulwp **, int *);
443 extern	struct ulwp	*queue_waiter(queue_head_t *);
444 extern	int		dequeue_self(queue_head_t *);
445 extern	void		queue_unlink(queue_head_t *,
446 				struct ulwp **, struct ulwp *);
447 extern	void		unsleep_self(void);
448 extern	void		spin_lock_set(mutex_t *);
449 extern	void		spin_lock_clear(mutex_t *);
450 
451 /*
452  * Scheduling class information structure.
453  */
454 typedef struct {
455 	short		pcc_state;
456 	short		pcc_policy;
457 	pri_t		pcc_primin;
458 	pri_t		pcc_primax;
459 	pcinfo_t	pcc_info;
460 } pcclass_t;
461 
462 /*
463  * Memory block for chain of owned ceiling mutexes.
464  */
465 typedef struct mxchain {
466 	struct mxchain	*mxchain_next;
467 	mutex_t		*mxchain_mx;
468 } mxchain_t;
469 
470 /*
471  * Pointer to an rwlock that is held for reading.
472  * Used in rw_rdlock() to allow a thread that already holds a read
473  * lock to acquire another read lock on the same rwlock even if
474  * there are writers waiting.  This to avoid deadlock when acquiring
475  * a read lock more than once in the presence of pending writers.
476  * POSIX mandates this behavior.
477  */
478 typedef struct {
479 	void	*rd_rwlock;	/* the rwlock held for reading */
480 	size_t	rd_count;	/* count of read locks applied */
481 } readlock_t;
482 
483 #ifdef _SYSCALL32
484 typedef struct {
485 	caddr32_t	rd_rwlock;
486 	size32_t	rd_count;
487 } readlock32_t;
488 #endif	/* _SYSCALL32 */
489 
490 /*
491  * Maximum number of read locks allowed for one thread on one rwlock.
492  * This could be as large as INT_MAX, but the SUSV3 test suite would
493  * take an inordinately long time to complete.  This is big enough.
494  */
495 #define	READ_LOCK_MAX	100000
496 
497 #define	ul_tlsent	ul_tls.tls_data	/* array of pointers to dynamic TLS */
498 #define	ul_ntlsent	ul_tls.tls_size	/* number of entries in ul_tlsent */
499 
500 /*
501  * Round up an integral value to a multiple of 64
502  */
503 #define	roundup64(x)	(-(-(x) & -64))
504 
505 /*
506  * NOTE:  Whatever changes are made to ulwp_t must be
507  * reflected in $SRC/cmd/mdb/common/modules/libc/libc.c
508  *
509  * NOTE: ul_self *must* be the first member of ulwp_t on x86
510  * Low-level x86 code relies on this.
511  */
512 typedef struct ulwp {
513 	/*
514 	 * These members always need to come first on sparc.
515 	 * For dtrace, a ulwp_t must be aligned on a 64-byte boundary.
516 	 */
517 #if defined(__sparc)
518 	uint32_t	ul_dinstr;	/* scratch space for dtrace */
519 	uint32_t	ul_padsparc0[15];
520 	uint32_t	ul_dsave;	/* dtrace: save %g1, %g0, %sp */
521 	uint32_t	ul_drestore;	/* dtrace: restore %g0, %g0, %g0 */
522 	uint32_t	ul_dftret;	/* dtrace: return probe fasttrap */
523 	uint32_t	ul_dreturn;	/* dtrace: return %o0 */
524 #endif
525 	struct ulwp	*ul_self;	/* pointer to self */
526 #if defined(__i386)
527 	uint8_t		ul_dinstr[40];	/* scratch space for dtrace */
528 #elif defined(__amd64)
529 	uint8_t		ul_dinstr[56];	/* scratch space for dtrace */
530 #endif
531 	struct uberdata *ul_uberdata;	/* uber (super-global) data */
532 	tls_t		ul_tls;		/* dynamic thread-local storage base */
533 	struct ulwp	*ul_forw;	/* forw, back all_lwps list, */
534 	struct ulwp	*ul_back;	/* protected by link_lock */
535 	struct ulwp	*ul_next;	/* list to keep track of stacks */
536 	struct ulwp	*ul_hash;	/* hash chain linked list */
537 	void		*ul_rval;	/* return value from thr_exit() */
538 	caddr_t		ul_stk;		/* mapping base of the stack */
539 	size_t		ul_mapsiz;	/* mapping size of the stack */
540 	size_t		ul_guardsize;	/* normally _lpagesize */
541 	uintptr_t	ul_stktop;	/* broken thr_stksegment() interface */
542 	size_t		ul_stksiz;	/* broken thr_stksegment() interface */
543 	stack_t		ul_ustack;	/* current stack boundaries */
544 	int		ul_ix;		/* hash index */
545 	lwpid_t		ul_lwpid;	/* thread id, aka the lwp id */
546 	pri_t		ul_pri;		/* scheduling priority */
547 	pri_t		ul_epri;	/* real-time ceiling priority */
548 	char		ul_policy;	/* scheduling policy */
549 	char		ul_cid;		/* scheduling class id */
550 	union {
551 		struct {
552 			char	cursig;	/* deferred signal number */
553 			char	pleasestop; /* lwp requested to stop itself */
554 		} s;
555 		short	curplease;	/* for testing both at once */
556 	} ul_cp;
557 	char		ul_stop;	/* reason for stopping */
558 	char		ul_signalled;	/* this lwp was cond_signal()d */
559 	char		ul_dead;	/* this lwp has called thr_exit */
560 	char		ul_unwind;	/* posix: unwind C++ stack */
561 	char		ul_detached;	/* THR_DETACHED at thread_create() */
562 					/* or pthread_detach() was called */
563 	char		ul_writer;	/* sleeping in rw_wrlock() */
564 	char		ul_stopping;	/* set by curthread: stopping self */
565 	char		ul_cancel_prologue;	/* for _cancel_prologue() */
566 	short		ul_preempt;	/* no_preempt()/preempt() */
567 	short		ul_savpreempt;	/* pre-existing preempt value */
568 	char		ul_sigsuspend;	/* thread is in sigsuspend/pollsys */
569 	char		ul_main;	/* thread is the main thread */
570 	char		ul_fork;	/* thread is performing a fork */
571 	char		ul_primarymap;	/* primary link-map is initialized */
572 	/* per-thread copies of the corresponding global variables */
573 	uint8_t		ul_max_spinners;	/* thread_max_spinners */
574 	char		ul_door_noreserve;	/* thread_door_noreserve */
575 	char		ul_queue_fifo;		/* thread_queue_fifo */
576 	char		ul_cond_wait_defer;	/* thread_cond_wait_defer */
577 	char		ul_error_detection;	/* thread_error_detection */
578 	char		ul_async_safe;		/* thread_async_safe */
579 	char		ul_rt;			/* found on an RT queue */
580 	char		ul_rtqueued;		/* was RT when queued */
581 	char		ul_misaligned;		/* thread_locks_misaligned */
582 	char		ul_pad[3];
583 	int		ul_adaptive_spin;	/* thread_adaptive_spin */
584 	int		ul_queue_spin;		/* thread_queue_spin */
585 	volatile int	ul_critical;	/* non-zero == in a critical region */
586 	int		ul_sigdefer;	/* non-zero == defer signals */
587 	int		ul_vfork;	/* thread is the child of vfork() */
588 	int		ul_cancelable;	/* _cancelon()/_canceloff() */
589 	char		ul_cancel_pending;  /* pthread_cancel() was called */
590 	char		ul_cancel_disabled; /* PTHREAD_CANCEL_DISABLE */
591 	char		ul_cancel_async;    /* PTHREAD_CANCEL_ASYNCHRONOUS */
592 	char		ul_save_async;	/* saved copy of ul_cancel_async */
593 	char		ul_mutator;	/* lwp is a mutator (java interface) */
594 	char		ul_created;	/* created suspended */
595 	char		ul_replace;	/* replacement; must be free()d */
596 	uchar_t		ul_nocancel;	/* cancellation can't happen */
597 	int		ul_errno;	/* per-thread errno */
598 	int		*ul_errnop;	/* pointer to errno or self->ul_errno */
599 	__cleanup_t	*ul_clnup_hdr;	/* head of cleanup handlers list */
600 	uberflags_t	*ul_schedctl_called;	/* ul_schedctl is set up */
601 	volatile sc_shared_t *ul_schedctl;	/* schedctl data */
602 	int		ul_bindflags;	/* bind_guard() interface to ld.so.1 */
603 	uint_t		ul_libc_locks;	/* count of cancel_safe_mutex_lock()s */
604 	tsd_t		*ul_stsd;	/* slow TLS for keys >= TSD_NFAST */
605 	void		*ul_ftsd[TSD_NFAST]; /* fast TLS for keys < TSD_NFAST */
606 	td_evbuf_t	ul_td_evbuf;	/* event buffer */
607 	char		ul_td_events_enable;	/* event mechanism enabled */
608 	char		ul_sync_obj_reg;	/* tdb_sync_obj_register() */
609 	char		ul_qtype;	/* MX or CV */
610 	char		ul_cv_wake;	/* != 0: just wake up, don't requeue */
611 	int		ul_rtld;	/* thread is running inside ld.so.1 */
612 	int		ul_usropts;	/* flags given to thr_create() */
613 	void		*(*ul_startpc)(void *); /* start func (thr_create()) */
614 	void		*ul_startarg;	/* argument for start function */
615 	void		*ul_wchan;	/* synch object when sleeping */
616 	struct ulwp	*ul_link;	/* sleep queue link */
617 	queue_head_t	*ul_sleepq;	/* sleep queue thread is waiting on */
618 	mutex_t		*ul_cvmutex;	/* mutex dropped when waiting on a cv */
619 	mxchain_t	*ul_mxchain;	/* chain of owned ceiling mutexes */
620 	int		ul_save_state;	/* bind_guard() interface to ld.so.1 */
621 	uint_t		ul_rdlockcnt;	/* # entries in ul_readlock array */
622 				/* 0 means there is but a single entry */
623 	union {				/* single entry or pointer to array */
624 		readlock_t	single;
625 		readlock_t	*array;
626 	} ul_readlock;
627 	uint_t		ul_heldlockcnt;	/* # entries in ul_heldlocks array */
628 				/* 0 means there is but a single entry */
629 	union {				/* single entry or pointer to array */
630 		mutex_t		*single;
631 		mutex_t		**array;
632 	} ul_heldlocks;
633 	/* PROBE_SUPPORT begin */
634 	void		*ul_tpdp;
635 	/* PROBE_SUPPORT end */
636 	ucontext_t	*ul_siglink;	/* pointer to previous context */
637 	uint_t		ul_spin_lock_spin;	/* spin lock statistics */
638 	uint_t		ul_spin_lock_spin2;
639 	uint_t		ul_spin_lock_sleep;
640 	uint_t		ul_spin_lock_wakeup;
641 	queue_root_t	ul_queue_root;	/* root of a sleep queue */
642 	id_t		ul_rtclassid;	/* real-time class id */
643 	uint_t		ul_pilocks;	/* count of PI locks held */
644 		/* the following members *must* be last in the structure */
645 		/* they are discarded when ulwp is replaced on thr_exit() */
646 	sigset_t	ul_sigmask;	/* thread's current signal mask */
647 	sigset_t	ul_tmpmask;	/* signal mask for sigsuspend/pollsys */
648 	siginfo_t	ul_siginfo;	/* deferred siginfo */
649 	mutex_t		ul_spinlock;	/* used when suspending/continuing */
650 	fpuenv_t	ul_fpuenv;	/* floating point state */
651 	uintptr_t	ul_sp;		/* stack pointer when blocked */
652 	void		*ul_ex_unwind;	/* address of _ex_unwind() or -1 */
653 #if defined(sparc)
654 	void		*ul_unwind_ret;	/* used only by _ex_clnup_handler() */
655 #endif
656 } ulwp_t;
657 
658 #define	ul_cursig	ul_cp.s.cursig		/* deferred signal number */
659 #define	ul_pleasestop	ul_cp.s.pleasestop	/* lwp requested to stop */
660 #define	ul_curplease	ul_cp.curplease		/* for testing both at once */
661 
662 /*
663  * This is the size of a replacement ulwp, retained only for the benefit
664  * of thr_join().  The trailing members are unneeded for this purpose.
665  */
666 #define	REPLACEMENT_SIZE	((size_t)&((ulwp_t *)NULL)->ul_sigmask)
667 
668 /*
669  * Definitions for static initialization of signal sets,
670  * plus some sneaky optimizations in various places.
671  */
672 
673 #define	SIGMASK(sig)	((uint32_t)1 << (((sig) - 1) & (32 - 1)))
674 
675 #if (MAXSIG > (2 * 32) && MAXSIG <= (3 * 32))
676 #define	FILLSET0	0xffffffffu
677 #define	FILLSET1	0xffffffffu
678 #define	FILLSET2	((1u << (MAXSIG - 64)) - 1)
679 #define	FILLSET3	0
680 #else
681 #error "fix me: MAXSIG out of bounds"
682 #endif
683 
684 #define	CANTMASK0	(SIGMASK(SIGKILL) | SIGMASK(SIGSTOP))
685 #define	CANTMASK1	0
686 #define	CANTMASK2	0
687 #define	CANTMASK3	0
688 
689 #define	MASKSET0	(FILLSET0 & ~CANTMASK0)
690 #define	MASKSET1	(FILLSET1 & ~CANTMASK1)
691 #define	MASKSET2	(FILLSET2 & ~CANTMASK2)
692 #define	MASKSET3	(FILLSET3 & ~CANTMASK3)
693 
694 extern	const sigset_t maskset;		/* set of all maskable signals */
695 
696 extern	int	thread_adaptive_spin;
697 extern	uint_t	thread_max_spinners;
698 extern	int	thread_queue_spin;
699 extern	int	thread_queue_fifo;
700 extern	int	thread_queue_dump;
701 extern	int	thread_cond_wait_defer;
702 extern	int	thread_async_safe;
703 extern	int	thread_queue_verify;
704 
705 /*
706  * pthread_atfork() related data, used to store atfork handlers.
707  */
708 typedef struct atfork {
709 	struct atfork *forw;		/* forward pointer */
710 	struct atfork *back;		/* backward pointer */
711 	void (*prepare)(void);		/* pre-fork handler */
712 	void (*parent)(void);		/* post-fork parent handler */
713 	void (*child)(void);		/* post-fork child handler */
714 } atfork_t;
715 
716 /*
717  * Element in the table and in the list of registered process
718  * robust locks.  We keep track of these to make sure that we
719  * only call ___lwp_mutex_register() once for each such lock
720  * after it is first mapped in (or newly mapped in).
721  */
722 typedef struct robust {
723 	struct robust	*robust_next;	/* hash table list */
724 	struct robust	*robust_list;	/* global list */
725 	mutex_t		*robust_lock;
726 } robust_t;
727 
728 /*
729  * Invalid address, used to mark an unused element in the hash table.
730  */
731 #define	INVALID_ADDR	((void *)(uintptr_t)(-1L))
732 
733 /*
734  * Parameters of the lock registration hash table.
735  */
736 #define	LOCKSHIFT	15			/* number of hashing bits */
737 #define	LOCKHASHSZ	(1 << LOCKSHIFT)	/* power of 2 (1<<15 == 32K) */
738 #define	LOCK_HASH(addr)	(uint_t)			\
739 	((((uintptr_t)(addr) >> 3)			\
740 	^ ((uintptr_t)(addr) >> (LOCKSHIFT + 3)))	\
741 	& (LOCKHASHSZ - 1))
742 
743 /*
744  * Make our hot locks reside on private cache lines (64 bytes).
745  */
746 typedef struct {
747 	mutex_t	pad_lock;
748 	char	pad_pad[64 - sizeof (mutex_t)];
749 } pad_lock_t;
750 
751 /*
752  * Make our semi-hot locks reside on semi-private cache lines (32 bytes).
753  */
754 typedef struct {
755 	mutex_t	pad_lock;
756 	char	pad_pad[32 - sizeof (mutex_t)];
757 } pad32_lock_t;
758 
759 /*
760  * The threads hash table is used for fast lookup and locking of an active
761  * thread structure (ulwp_t) given a thread-id.  It is an N-element array of
762  * thr_hash_table_t structures, where N == 1 before the main thread creates
763  * the first additional thread and N == 1024 afterwards.  Each element of the
764  * table is 64 bytes in size and alignment to reduce cache conflicts.
765  */
766 typedef struct {
767 	mutex_t	hash_lock;	/* lock per bucket */
768 	cond_t	hash_cond;	/* convar per bucket */
769 	ulwp_t	*hash_bucket;	/* hash bucket points to the list of ulwps */
770 	char	hash_pad[64 -	/* pad out to 64 bytes */
771 		(sizeof (mutex_t) + sizeof (cond_t) + sizeof (ulwp_t *))];
772 } thr_hash_table_t;
773 
774 #ifdef _SYSCALL32
775 typedef struct {
776 	mutex_t	hash_lock;
777 	cond_t	hash_cond;
778 	caddr32_t hash_bucket;
779 	char	hash_pad[64 -
780 		(sizeof (mutex_t) + sizeof (cond_t) + sizeof (caddr32_t))];
781 } thr_hash_table32_t;
782 #endif	/* _SYSCALL32 */
783 
784 
785 /*
786  * siguaction members have 128-byte size and 64-byte alignment.
787  * We know that sizeof (struct sigaction) is 32 bytes for both
788  * _ILP32 and _LP64 and that sizeof (rwlock_t) is 64 bytes.
789  */
790 typedef struct {
791 	rwlock_t	sig_lock;
792 	struct sigaction sig_uaction;
793 	char	sig_pad[128 - sizeof (rwlock_t) - sizeof (struct sigaction)];
794 } siguaction_t;
795 
796 #ifdef _SYSCALL32
797 typedef struct {
798 	rwlock_t	sig_lock;
799 	struct sigaction32 sig_uaction;
800 	char	sig_pad[128 - sizeof (rwlock_t) - sizeof (struct sigaction32)];
801 } siguaction32_t;
802 #endif	/* _SYSCALL32 */
803 
804 
805 /*
806  * Bucket structures, used by lmalloc()/lfree().
807  * See port/threads/alloc.c for details.
808  * A bucket's size and alignment is 64 bytes.
809  */
810 typedef struct {
811 	mutex_t	bucket_lock;	/* protects the free list allocations */
812 	void	*free_list;	/* LIFO list of blocks to allocate/free */
813 	size_t	chunks;		/* number of 64K blocks mmap()ed last time */
814 	char	pad64[64 -	/* pad out to 64 bytes */
815 		(sizeof (mutex_t) + sizeof (void *) + sizeof (size_t))];
816 } bucket_t;
817 
818 #ifdef _SYSCALL32
819 typedef struct {
820 	mutex_t		bucket_lock;
821 	caddr32_t	free_list;
822 	size32_t	chunks;
823 	char	pad64[64 -	/* pad out to 64 bytes */
824 		(sizeof (mutex_t) + sizeof (caddr32_t) + sizeof (size32_t))];
825 } bucket32_t;
826 #endif	/* _SYSCALL32 */
827 
828 #define	NBUCKETS	10	/* sizes ranging from 64 to 32768 */
829 
830 
831 /*
832  * atexit() data structures.
833  * See port/gen/atexit.c for details.
834  */
835 typedef void (*_exithdlr_func_t) (void);
836 
837 typedef struct _exthdlr {
838 	struct _exthdlr 	*next;	/* next in handler list */
839 	_exithdlr_func_t	hdlr;	/* handler itself */
840 } _exthdlr_t;
841 
842 typedef struct {
843 	mutex_t		exitfns_lock;
844 	_exthdlr_t	*head;
845 	void		*exit_frame_monitor;
846 	char		exit_pad[64 -	/* pad out to 64 bytes */
847 		(sizeof (mutex_t) + sizeof (_exthdlr_t *) + sizeof (void *))];
848 } atexit_root_t;
849 
850 #ifdef _SYSCALL32
851 typedef struct {
852 	mutex_t		exitfns_lock;
853 	caddr32_t	head;
854 	caddr32_t	exit_frame_monitor;
855 	char		exit_pad[64 -	/* pad out to 64 bytes */
856 		(sizeof (mutex_t) + sizeof (caddr32_t) + sizeof (caddr32_t))];
857 } atexit_root32_t;
858 #endif	/* _SYSCALL32 */
859 
860 
861 /*
862  * This is data that is global to all link maps (uberdata, aka super-global).
863  * Note: When changing this, please be sure to keep the 32-bit variant of
864  * this in sync.  (see uberdata32_t below)
865  */
866 typedef struct uberdata {
867 	pad_lock_t	_link_lock;
868 	pad_lock_t	_ld_lock;
869 	pad_lock_t	_fork_lock;
870 	pad_lock_t	_atfork_lock;
871 	pad32_lock_t	_callout_lock;
872 	pad32_lock_t	_tdb_hash_lock;
873 	tdb_sync_stats_t tdb_hash_lock_stats;
874 	siguaction_t	siguaction[NSIG];
875 	bucket_t	bucket[NBUCKETS];
876 	atexit_root_t	atexit_root;
877 	tsd_metadata_t	tsd_metadata;
878 	tls_metadata_t	tls_metadata;
879 	/*
880 	 * Every object before this point has size and alignment of 64 bytes.
881 	 * Don't add any other type of data before this point.
882 	 */
883 	char	primary_map;	/* set when primary link map is initialized */
884 	char	bucket_init;	/* set when bucket[NBUCKETS] is initialized */
885 	char	pad[2];
886 	uberflags_t	uberflags;
887 	queue_head_t	*queue_head;
888 	thr_hash_table_t *thr_hash_table;
889 	uint_t		hash_size;	/* # of entries in thr_hash_table[] */
890 	uint_t		hash_mask;	/* hash_size - 1 */
891 	ulwp_t	*ulwp_one;	/* main thread */
892 	ulwp_t	*all_lwps;	/* circular ul_forw/ul_back list of live lwps */
893 	ulwp_t	*all_zombies;	/* circular ul_forw/ul_back list of zombies */
894 	int	nthreads;	/* total number of live threads/lwps */
895 	int	nzombies;	/* total number of zombie threads */
896 	int	ndaemons;	/* total number of THR_DAEMON threads/lwps */
897 	pid_t	pid;		/* the current process's pid */
898 	void	(*sigacthandler)(int, siginfo_t *, void *);
899 	ulwp_t	*lwp_stacks;
900 	ulwp_t	*lwp_laststack;
901 	int	nfreestack;
902 	int	thread_stack_cache;
903 	ulwp_t	*ulwp_freelist;
904 	ulwp_t	*ulwp_lastfree;
905 	ulwp_t	*ulwp_replace_free;
906 	ulwp_t	*ulwp_replace_last;
907 	atfork_t	*atforklist;	/* circular Q for fork handlers */
908 	robust_t	**robustlocks;	/* table of registered robust locks */
909 	robust_t	*robustlist;	/* list of registered robust locks */
910 	char	*progname;	/* the basename of the program, from argv[0] */
911 	struct uberdata **tdb_bootstrap;
912 	tdb_t	tdb;		/* thread debug interfaces (for libc_db) */
913 } uberdata_t;
914 
915 #define	link_lock	_link_lock.pad_lock
916 #define	ld_lock		_ld_lock.pad_lock
917 #define	fork_lock	_fork_lock.pad_lock
918 #define	atfork_lock	_atfork_lock.pad_lock
919 #define	callout_lock	_callout_lock.pad_lock
920 #define	tdb_hash_lock	_tdb_hash_lock.pad_lock
921 
922 #pragma align 64(__uberdata)
923 extern	uberdata_t	__uberdata;
924 extern	uberdata_t	**__tdb_bootstrap;	/* known to libc_db and mdb */
925 extern	int		primary_link_map;
926 
927 #define	ulwp_mutex(ulwp, udp)	\
928 	(&(udp)->thr_hash_table[(ulwp)->ul_ix].hash_lock)
929 #define	ulwp_condvar(ulwp, udp)	\
930 	(&(udp)->thr_hash_table[(ulwp)->ul_ix].hash_cond)
931 
932 /*
933  * Grab and release the hash table lock for the specified lwp.
934  */
935 #define	ulwp_lock(ulwp, udp)	lmutex_lock(ulwp_mutex(ulwp, udp))
936 #define	ulwp_unlock(ulwp, udp)	lmutex_unlock(ulwp_mutex(ulwp, udp))
937 
938 #ifdef _SYSCALL32	/* needed by libc_db */
939 
940 typedef struct ulwp32 {
941 #if defined(__sparc)
942 	uint32_t	ul_dinstr;	/* scratch space for dtrace */
943 	uint32_t	ul_padsparc0[15];
944 	uint32_t	ul_dsave;	/* dtrace: save %g1, %g0, %sp */
945 	uint32_t	ul_drestore;	/* dtrace: restore %g0, %g0, %g0 */
946 	uint32_t	ul_dftret;	/* dtrace: return probe fasttrap */
947 	uint32_t	ul_dreturn;	/* dtrace: return %o0 */
948 #endif
949 	caddr32_t	ul_self;	/* pointer to self */
950 #if defined(__x86)
951 	uint8_t		ul_dinstr[40];	/* scratch space for dtrace */
952 #endif
953 	caddr32_t	ul_uberdata;	/* uber (super-global) data */
954 	tls32_t		ul_tls;		/* dynamic thread-local storage base */
955 	caddr32_t	ul_forw;	/* forw, back all_lwps list, */
956 	caddr32_t	ul_back;	/* protected by link_lock */
957 	caddr32_t	ul_next;	/* list to keep track of stacks */
958 	caddr32_t	ul_hash;	/* hash chain linked list */
959 	caddr32_t	ul_rval;	/* return value from thr_exit() */
960 	caddr32_t	ul_stk;		/* mapping base of the stack */
961 	size32_t	ul_mapsiz;	/* mapping size of the stack */
962 	size32_t	ul_guardsize;	/* normally _lpagesize */
963 	caddr32_t	ul_stktop;	/* broken thr_stksegment() interface */
964 	size32_t	ul_stksiz;	/* broken thr_stksegment() interface */
965 	stack32_t	ul_ustack;	/* current stack boundaries */
966 	int		ul_ix;		/* hash index */
967 	lwpid_t		ul_lwpid;	/* thread id, aka the lwp id */
968 	pri_t		ul_pri;		/* scheduling priority */
969 	pri_t		ul_epri;	/* real-time ceiling priority */
970 	char		ul_policy;	/* scheduling policy */
971 	char		ul_cid;		/* scheduling class id */
972 	union {
973 		struct {
974 			char	cursig;	/* deferred signal number */
975 			char	pleasestop; /* lwp requested to stop itself */
976 		} s;
977 		short	curplease;	/* for testing both at once */
978 	} ul_cp;
979 	char		ul_stop;	/* reason for stopping */
980 	char		ul_signalled;	/* this lwp was cond_signal()d */
981 	char		ul_dead;	/* this lwp has called thr_exit */
982 	char		ul_unwind;	/* posix: unwind C++ stack */
983 	char		ul_detached;	/* THR_DETACHED at thread_create() */
984 					/* or pthread_detach() was called */
985 	char		ul_writer;	/* sleeping in rw_wrlock() */
986 	char		ul_stopping;	/* set by curthread: stopping self */
987 	char		ul_cancel_prologue;	/* for _cancel_prologue() */
988 	short		ul_preempt;	/* no_preempt()/preempt() */
989 	short		ul_savpreempt;	/* pre-existing preempt value */
990 	char		ul_sigsuspend;	/* thread is in sigsuspend/pollsys */
991 	char		ul_main;	/* thread is the main thread */
992 	char		ul_fork;	/* thread is performing a fork */
993 	char		ul_primarymap;	/* primary link-map is initialized */
994 	/* per-thread copies of the corresponding global variables */
995 	uint8_t		ul_max_spinners;	/* thread_max_spinners */
996 	char		ul_door_noreserve;	/* thread_door_noreserve */
997 	char		ul_queue_fifo;		/* thread_queue_fifo */
998 	char		ul_cond_wait_defer;	/* thread_cond_wait_defer */
999 	char		ul_error_detection;	/* thread_error_detection */
1000 	char		ul_async_safe;		/* thread_async_safe */
1001 	char		ul_rt;			/* found on an RT queue */
1002 	char		ul_rtqueued;		/* was RT when queued */
1003 	char		ul_misaligned;		/* thread_locks_misaligned */
1004 	char		ul_pad[3];
1005 	int		ul_adaptive_spin;	/* thread_adaptive_spin */
1006 	int		ul_queue_spin;		/* thread_queue_spin */
1007 	int		ul_critical;	/* non-zero == in a critical region */
1008 	int		ul_sigdefer;	/* non-zero == defer signals */
1009 	int		ul_vfork;	/* thread is the child of vfork() */
1010 	int		ul_cancelable;	/* _cancelon()/_canceloff() */
1011 	char		ul_cancel_pending;  /* pthread_cancel() was called */
1012 	char		ul_cancel_disabled; /* PTHREAD_CANCEL_DISABLE */
1013 	char		ul_cancel_async;    /* PTHREAD_CANCEL_ASYNCHRONOUS */
1014 	char		ul_save_async;	/* saved copy of ul_cancel_async */
1015 	char		ul_mutator;	/* lwp is a mutator (java interface) */
1016 	char		ul_created;	/* created suspended */
1017 	char		ul_replace;	/* replacement; must be free()d */
1018 	uchar_t		ul_nocancel;	/* cancellation can't happen */
1019 	int		ul_errno;	/* per-thread errno */
1020 	caddr32_t	ul_errnop;	/* pointer to errno or self->ul_errno */
1021 	caddr32_t	ul_clnup_hdr;	/* head of cleanup handlers list */
1022 	caddr32_t	ul_schedctl_called; /* ul_schedctl is set up */
1023 	caddr32_t	ul_schedctl;	/* schedctl data */
1024 	int		ul_bindflags;	/* bind_guard() interface to ld.so.1 */
1025 	uint_t		ul_libc_locks;	/* count of cancel_safe_mutex_lock()s */
1026 	caddr32_t	ul_stsd;	/* slow TLS for keys >= TSD_NFAST */
1027 	caddr32_t	ul_ftsd[TSD_NFAST]; /* fast TLS for keys < TSD_NFAST */
1028 	td_evbuf32_t	ul_td_evbuf;	/* event buffer */
1029 	char		ul_td_events_enable;	/* event mechanism enabled */
1030 	char		ul_sync_obj_reg;	/* tdb_sync_obj_register() */
1031 	char		ul_qtype;	/* MX or CV */
1032 	char		ul_cv_wake;	/* != 0: just wake up, don't requeue */
1033 	int		ul_rtld;	/* thread is running inside ld.so.1 */
1034 	int		ul_usropts;	/* flags given to thr_create() */
1035 	caddr32_t	ul_startpc;	/* start func (thr_create()) */
1036 	caddr32_t	ul_startarg;	/* argument for start function */
1037 	caddr32_t	ul_wchan;	/* synch object when sleeping */
1038 	caddr32_t	ul_link;	/* sleep queue link */
1039 	caddr32_t	ul_sleepq;	/* sleep queue thread is waiting on */
1040 	caddr32_t	ul_cvmutex;	/* mutex dropped when waiting on a cv */
1041 	caddr32_t	ul_mxchain;	/* chain of owned ceiling mutexes */
1042 	int		ul_save_state;	/* bind_guard() interface to ld.so.1 */
1043 	uint_t		ul_rdlockcnt;	/* # entries in ul_readlock array */
1044 				/* 0 means there is but a single entry */
1045 	union {				/* single entry or pointer to array */
1046 		readlock32_t	single;
1047 		caddr32_t	array;
1048 	} ul_readlock;
1049 	uint_t		ul_heldlockcnt;	/* # entries in ul_heldlocks array */
1050 				/* 0 means there is but a single entry */
1051 	union {				/* single entry or pointer to array */
1052 		caddr32_t	single;
1053 		caddr32_t	array;
1054 	} ul_heldlocks;
1055 	/* PROBE_SUPPORT begin */
1056 	caddr32_t	ul_tpdp;
1057 	/* PROBE_SUPPORT end */
1058 	caddr32_t	ul_siglink;	/* pointer to previous context */
1059 	uint_t		ul_spin_lock_spin;	/* spin lock statistics */
1060 	uint_t		ul_spin_lock_spin2;
1061 	uint_t		ul_spin_lock_sleep;
1062 	uint_t		ul_spin_lock_wakeup;
1063 	queue_root32_t	ul_queue_root;	/* root of a sleep queue */
1064 	id_t		ul_rtclassid;	/* real-time class id */
1065 	uint_t		ul_pilocks;	/* count of PI locks held */
1066 		/* the following members *must* be last in the structure */
1067 		/* they are discarded when ulwp is replaced on thr_exit() */
1068 	sigset_t	ul_sigmask;	/* thread's current signal mask */
1069 	sigset_t	ul_tmpmask;	/* signal mask for sigsuspend/pollsys */
1070 	siginfo32_t	ul_siginfo;	/* deferred siginfo */
1071 	mutex_t		ul_spinlock;	/* used when suspending/continuing */
1072 	fpuenv32_t	ul_fpuenv;	/* floating point state */
1073 	caddr32_t	ul_sp;		/* stack pointer when blocked */
1074 #if defined(sparc)
1075 	caddr32_t	ul_unwind_ret;	/* used only by _ex_clnup_handler() */
1076 #endif
1077 } ulwp32_t;
1078 
1079 #define	REPLACEMENT_SIZE32	((size_t)&((ulwp32_t *)NULL)->ul_sigmask)
1080 
1081 typedef struct uberdata32 {
1082 	pad_lock_t	_link_lock;
1083 	pad_lock_t	_ld_lock;
1084 	pad_lock_t	_fork_lock;
1085 	pad_lock_t	_atfork_lock;
1086 	pad32_lock_t	_callout_lock;
1087 	pad32_lock_t	_tdb_hash_lock;
1088 	tdb_sync_stats_t tdb_hash_lock_stats;
1089 	siguaction32_t	siguaction[NSIG];
1090 	bucket32_t	bucket[NBUCKETS];
1091 	atexit_root32_t	atexit_root;
1092 	tsd_metadata32_t tsd_metadata;
1093 	tls_metadata32_t tls_metadata;
1094 	char		primary_map;
1095 	char		bucket_init;
1096 	char		pad[2];
1097 	uberflags_t	uberflags;
1098 	caddr32_t	queue_head;
1099 	caddr32_t	thr_hash_table;
1100 	uint_t		hash_size;
1101 	uint_t		hash_mask;
1102 	caddr32_t	ulwp_one;
1103 	caddr32_t	all_lwps;
1104 	caddr32_t	all_zombies;
1105 	int		nthreads;
1106 	int		nzombies;
1107 	int		ndaemons;
1108 	int		pid;
1109 	caddr32_t	sigacthandler;
1110 	caddr32_t	lwp_stacks;
1111 	caddr32_t	lwp_laststack;
1112 	int		nfreestack;
1113 	int		thread_stack_cache;
1114 	caddr32_t	ulwp_freelist;
1115 	caddr32_t	ulwp_lastfree;
1116 	caddr32_t	ulwp_replace_free;
1117 	caddr32_t	ulwp_replace_last;
1118 	caddr32_t	atforklist;
1119 	caddr32_t	robustlocks;
1120 	caddr32_t	robustlist;
1121 	caddr32_t	progname;
1122 	caddr32_t	tdb_bootstrap;
1123 	tdb32_t		tdb;
1124 } uberdata32_t;
1125 
1126 #endif	/* _SYSCALL32 */
1127 
1128 /* ul_stop values */
1129 #define	TSTP_REGULAR	0x01	/* Stopped by thr_suspend() */
1130 #define	TSTP_MUTATOR	0x08	/* stopped by thr_suspend_*mutator*() */
1131 #define	TSTP_FORK	0x20	/* stopped by suspend_fork() */
1132 
1133 /*
1134  * Implementation-specific attribute types for pthread_mutexattr_init() etc.
1135  */
1136 
1137 typedef	struct	_cvattr {
1138 	int	pshared;
1139 	clockid_t clockid;
1140 } cvattr_t;
1141 
1142 typedef	struct	_mattr {
1143 	int	pshared;
1144 	int	protocol;
1145 	int	prioceiling;
1146 	int	type;
1147 	int	robustness;
1148 } mattr_t;
1149 
1150 typedef	struct	_thrattr {
1151 	size_t	stksize;
1152 	void	*stkaddr;
1153 	int	detachstate;
1154 	int	daemonstate;
1155 	int	scope;
1156 	int	prio;
1157 	int	policy;
1158 	int	inherit;
1159 	size_t	guardsize;
1160 } thrattr_t;
1161 
1162 typedef	struct	_rwlattr {
1163 	int	pshared;
1164 } rwlattr_t;
1165 
1166 /* _curthread() is inline for speed */
1167 extern	ulwp_t		*_curthread(void);
1168 #define	curthread	(_curthread())
1169 
1170 /* this version (also inline) can be tested for NULL */
1171 extern	ulwp_t		*__curthread(void);
1172 
1173 /* get the current stack pointer (also inline) */
1174 extern	greg_t		stkptr(void);
1175 
1176 /*
1177  * Suppress __attribute__((...)) if we are not compiling with gcc
1178  */
1179 #if !defined(__GNUC__)
1180 #define	__attribute__(string)
1181 #endif
1182 
1183 /* Fetch the dispatch (kernel) priority of a thread */
1184 #define	real_priority(ulwp)	\
1185 	((ulwp)->ul_schedctl? (ulwp)->ul_schedctl->sc_priority : 0)
1186 
1187 /*
1188  * Implementation functions.  Not visible outside of the library itself.
1189  */
1190 extern	int	__nanosleep(const timespec_t *, timespec_t *);
1191 extern	void	getgregs(ulwp_t *, gregset_t);
1192 extern	void	setgregs(ulwp_t *, gregset_t);
1193 extern	void	thr_panic(const char *);
1194 #pragma rarely_called(thr_panic)
1195 extern	ulwp_t	*find_lwp(thread_t);
1196 extern	void	finish_init(void);
1197 extern	void	update_sched(ulwp_t *);
1198 extern	void	queue_alloc(void);
1199 extern	void	tsd_exit(void);
1200 extern	void	tsd_free(ulwp_t *);
1201 extern	void	tls_setup(void);
1202 extern	void	tls_exit(void);
1203 extern	void	tls_free(ulwp_t *);
1204 extern	void	rwl_free(ulwp_t *);
1205 extern	void	heldlock_exit(void);
1206 extern	void	heldlock_free(ulwp_t *);
1207 extern	void	sigacthandler(int, siginfo_t *, void *);
1208 extern	void	signal_init(void);
1209 extern	int	sigequalset(const sigset_t *, const sigset_t *);
1210 extern	void	mutex_setup(void);
1211 extern	void	take_deferred_signal(int);
1212 extern	void	*setup_top_frame(void *, size_t, ulwp_t *);
1213 extern	int	setup_context(ucontext_t *, void *(*func)(ulwp_t *),
1214 			ulwp_t *ulwp, caddr_t stk, size_t stksize);
1215 extern	volatile sc_shared_t *setup_schedctl(void);
1216 extern	void	*lmalloc(size_t);
1217 extern	void	lfree(void *, size_t);
1218 extern	void	*libc_malloc(size_t);
1219 extern	void	*libc_realloc(void *, size_t);
1220 extern	void	libc_free(void *);
1221 extern	char	*libc_strdup(const char *);
1222 extern	void	ultos(uint64_t, int, char *);
1223 extern	void	lock_error(const mutex_t *, const char *, void *, const char *);
1224 extern	void	rwlock_error(const rwlock_t *, const char *, const char *);
1225 extern	void	thread_error(const char *);
1226 extern	void	grab_assert_lock(void);
1227 extern	void	dump_queue_statistics(void);
1228 extern	void	collect_queue_statistics(void);
1229 extern	void	record_spin_locks(ulwp_t *);
1230 extern	void	remember_lock(mutex_t *);
1231 extern	void	forget_lock(mutex_t *);
1232 extern	void	register_lock(mutex_t *);
1233 extern	void	unregister_locks(void);
1234 #if defined(__sparc)
1235 extern	void	_flush_windows(void);
1236 #else
1237 #define	_flush_windows()
1238 #endif
1239 extern	void	set_curthread(void *);
1240 
1241 /*
1242  * Utility function used when waking up many threads (more than MAXLWPS)
1243  * all at once.  See mutex_wakeup_all(), cond_broadcast(), and rw_unlock().
1244  */
1245 #define	MAXLWPS	128	/* max remembered lwpids before overflow */
1246 #define	NEWLWPS	2048	/* max remembered lwpids at first overflow */
1247 extern	lwpid_t	*alloc_lwpids(lwpid_t *, int *, int *);
1248 
1249 /* enter a critical section */
1250 #define	enter_critical(self)	(self->ul_critical++)
1251 
1252 /* exit a critical section, take deferred actions if necessary */
1253 extern	void	do_exit_critical(void);
1254 #define	exit_critical(self)					\
1255 	(void) (self->ul_critical--,				\
1256 	    ((self->ul_curplease && self->ul_critical == 0)?	\
1257 	    (do_exit_critical(), 0) : 0))
1258 
1259 /*
1260  * Like enter_critical()/exit_critical() but just for deferring signals.
1261  * Unlike enter_critical()/exit_critical(), ul_sigdefer may be set while
1262  * calling application functions like constructors and destructors.
1263  * Care must be taken if the application function attempts to set
1264  * the signal mask while a deferred signal is present; the setting
1265  * of the signal mask must also be deferred.
1266  */
1267 #define	sigoff(self)	(self->ul_sigdefer++)
1268 #define	sigon(self)						\
1269 	(void) ((--self->ul_sigdefer == 0 &&			\
1270 	    self->ul_curplease && self->ul_critical == 0)?	\
1271 	    (do_exit_critical(), 0) : 0)
1272 
1273 /* these are exported functions */
1274 extern	void	_sigoff(void);
1275 extern	void	_sigon(void);
1276 
1277 #define	sigorset(s1, s2)				\
1278 	(((s1)->__sigbits[0] |= (s2)->__sigbits[0]),	\
1279 	((s1)->__sigbits[1] |= (s2)->__sigbits[1]),	\
1280 	((s1)->__sigbits[2] |= (s2)->__sigbits[2]),	\
1281 	((s1)->__sigbits[3] |= (s2)->__sigbits[3]))
1282 
1283 #define	sigandset(s1, s2)				\
1284 	(((s1)->__sigbits[0] &= (s2)->__sigbits[0]),	\
1285 	((s1)->__sigbits[1] &= (s2)->__sigbits[1]),	\
1286 	((s1)->__sigbits[2] &= (s2)->__sigbits[2]),	\
1287 	((s1)->__sigbits[3] &= (s2)->__sigbits[3]))
1288 
1289 #define	sigdiffset(s1, s2)				\
1290 	(((s1)->__sigbits[0] &= ~(s2)->__sigbits[0]),	\
1291 	((s1)->__sigbits[1] &= ~(s2)->__sigbits[1]),	\
1292 	((s1)->__sigbits[2] &= ~(s2)->__sigbits[2]),	\
1293 	((s1)->__sigbits[3] &= ~(s2)->__sigbits[3]))
1294 
1295 #define	delete_reserved_signals(s)			\
1296 	(((s)->__sigbits[0] &= MASKSET0),		\
1297 	((s)->__sigbits[1] &= (MASKSET1 & ~SIGMASK(SIGCANCEL))),\
1298 	((s)->__sigbits[2] &= MASKSET2),		\
1299 	((s)->__sigbits[3] &= MASKSET3))
1300 
1301 extern	void	block_all_signals(ulwp_t *self);
1302 
1303 /*
1304  * When restoring the signal mask after having previously called
1305  * block_all_signals(), if we have a deferred signal present then
1306  * do nothing other than ASSERT() that we are in a critical region.
1307  * The signal mask will be set when we emerge from the critical region
1308  * and call take_deferred_signal().  There is no race condition here
1309  * because the kernel currently has all signals blocked for this thread.
1310  */
1311 #define	restore_signals(self)						\
1312 	((void) ((self)->ul_cursig?					\
1313 	(ASSERT((self)->ul_critical + (self)->ul_sigdefer != 0), 0) :	\
1314 	__lwp_sigmask(SIG_SETMASK, &(self)->ul_sigmask)))
1315 
1316 extern	void	set_cancel_pending_flag(ulwp_t *, int);
1317 extern	void	set_cancel_eintr_flag(ulwp_t *);
1318 extern	void	set_parking_flag(ulwp_t *, int);
1319 extern	int	cancel_active(void);
1320 
1321 extern	void	*_thrp_setup(ulwp_t *);
1322 extern	void	_fpinherit(ulwp_t *);
1323 extern	void	_lwp_start(void);
1324 extern	void	_lwp_terminate(void);
1325 extern	void	lmutex_lock(mutex_t *);
1326 extern	void	lmutex_unlock(mutex_t *);
1327 extern	void	lrw_rdlock(rwlock_t *);
1328 extern	void	lrw_wrlock(rwlock_t *);
1329 extern	void	lrw_unlock(rwlock_t *);
1330 extern	void	sig_mutex_lock(mutex_t *);
1331 extern	void	sig_mutex_unlock(mutex_t *);
1332 extern	int	sig_mutex_trylock(mutex_t *);
1333 extern	int	sig_cond_wait(cond_t *, mutex_t *);
1334 extern	int	sig_cond_reltimedwait(cond_t *, mutex_t *, const timespec_t *);
1335 extern	void	cancel_safe_mutex_lock(mutex_t *);
1336 extern	void	cancel_safe_mutex_unlock(mutex_t *);
1337 extern	int	cancel_safe_mutex_trylock(mutex_t *);
1338 extern	void	_prefork_handler(void);
1339 extern	void	_postfork_parent_handler(void);
1340 extern	void	_postfork_child_handler(void);
1341 extern	void	postfork1_child(void);
1342 extern	void	postfork1_child_aio(void);
1343 extern	void	postfork1_child_sigev_aio(void);
1344 extern	void	postfork1_child_sigev_mq(void);
1345 extern	void	postfork1_child_sigev_timer(void);
1346 extern	void	postfork1_child_tpool(void);
1347 extern	void	fork_lock_enter(void);
1348 extern	void	fork_lock_exit(void);
1349 extern	void	suspend_fork(void);
1350 extern	void	continue_fork(int);
1351 extern	void	do_sigcancel(void);
1352 extern	void	setup_cancelsig(int);
1353 extern	void	init_sigev_thread(void);
1354 extern	void	init_aio(void);
1355 extern	void	init_progname(void);
1356 extern	void	_cancelon(void);
1357 extern	void	_canceloff(void);
1358 extern	void	_canceloff_nocancel(void);
1359 extern	void	_cancel_prologue(void);
1360 extern	void	_cancel_epilogue(void);
1361 extern	void	no_preempt(ulwp_t *);
1362 extern	void	preempt(ulwp_t *);
1363 extern	void	_thrp_unwind(void *);
1364 
1365 extern	pid_t	__forkx(int);
1366 extern	pid_t	__forkallx(int);
1367 extern	int	__open(const char *, int, mode_t);
1368 extern	int	__open64(const char *, int, mode_t);
1369 extern	int	__openat(int, const char *, int, mode_t);
1370 extern	int	__openat64(int, const char *, int, mode_t);
1371 extern	int	__close(int);
1372 extern	ssize_t	__read(int, void *, size_t);
1373 extern	ssize_t	__write(int, const void *, size_t);
1374 extern	int	__fcntl(int, int, ...);
1375 extern	int	__lwp_continue(lwpid_t);
1376 extern	int	__lwp_create(ucontext_t *, uint_t, lwpid_t *);
1377 extern	int	___lwp_suspend(lwpid_t);
1378 extern	int	lwp_wait(lwpid_t, lwpid_t *);
1379 extern	int	__lwp_wait(lwpid_t, lwpid_t *);
1380 extern	int	__lwp_detach(lwpid_t);
1381 extern	sc_shared_t *__schedctl(void);
1382 
1383 /* actual system call traps */
1384 extern	int	__setcontext(const ucontext_t *);
1385 extern	int	__getcontext(ucontext_t *);
1386 extern	int	__clock_gettime(clockid_t, timespec_t *);
1387 extern	void	abstime_to_reltime(clockid_t, const timespec_t *, timespec_t *);
1388 extern	void	hrt2ts(hrtime_t, timespec_t *);
1389 
1390 extern	int	__sigaction(int, const struct sigaction *, struct sigaction *);
1391 extern	int	__sigprocmask(int, const sigset_t *, sigset_t *);
1392 extern	int	__lwp_sigmask(int, const sigset_t *);
1393 extern	void	__sighndlr(int, siginfo_t *, ucontext_t *, void (*)());
1394 extern	caddr_t	__sighndlrend;
1395 #pragma unknown_control_flow(__sighndlr)
1396 
1397 /* belongs in <pthread.h> */
1398 #define	PTHREAD_CREATE_DAEMON_NP	0x100	/* = THR_DAEMON */
1399 #define	PTHREAD_CREATE_NONDAEMON_NP	0
1400 extern	int	pthread_attr_setdaemonstate_np(pthread_attr_t *, int);
1401 extern	int	pthread_attr_getdaemonstate_np(const pthread_attr_t *, int *);
1402 
1403 extern	int	mutex_held(mutex_t *);
1404 extern	int	mutex_lock_internal(mutex_t *, timespec_t *, int);
1405 extern	int	mutex_unlock_internal(mutex_t *, int);
1406 
1407 /* not cancellation points: */
1408 extern	int	__cond_wait(cond_t *, mutex_t *);
1409 extern	int	__cond_timedwait(cond_t *, mutex_t *, const timespec_t *);
1410 extern	int	__cond_reltimedwait(cond_t *, mutex_t *, const timespec_t *);
1411 
1412 extern	int	rw_read_held(rwlock_t *);
1413 extern	int	rw_write_held(rwlock_t *);
1414 
1415 extern	int	_thrp_create(void *, size_t, void *(*)(void *), void *, long,
1416 			thread_t *, size_t);
1417 extern	int	_thrp_suspend(thread_t, uchar_t);
1418 extern	int	_thrp_continue(thread_t, uchar_t);
1419 
1420 extern	void	_thrp_terminate(void *);
1421 extern	void	_thrp_exit(void);
1422 
1423 extern	const pcclass_t *get_info_by_class(id_t);
1424 extern	const pcclass_t *get_info_by_policy(int);
1425 extern	const thrattr_t *def_thrattr(void);
1426 extern	id_t	setparam(idtype_t, id_t, int, int);
1427 extern	id_t	setprio(idtype_t, id_t, int, int *);
1428 extern	id_t	getparam(idtype_t, id_t, int *, struct sched_param *);
1429 
1430 /*
1431  * System call wrappers (direct interfaces to the kernel)
1432  */
1433 extern	int	___lwp_mutex_register(mutex_t *, mutex_t **);
1434 extern	int	___lwp_mutex_trylock(mutex_t *, ulwp_t *);
1435 extern	int	___lwp_mutex_timedlock(mutex_t *, timespec_t *, ulwp_t *);
1436 extern	int	___lwp_mutex_unlock(mutex_t *);
1437 extern	int	___lwp_mutex_wakeup(mutex_t *, int);
1438 extern	int	___lwp_cond_wait(cond_t *, mutex_t *, timespec_t *, int);
1439 extern	int	___lwp_sema_timedwait(lwp_sema_t *, timespec_t *, int);
1440 extern	int	__lwp_rwlock_rdlock(rwlock_t *, timespec_t *);
1441 extern	int	__lwp_rwlock_wrlock(rwlock_t *, timespec_t *);
1442 extern	int	__lwp_rwlock_tryrdlock(rwlock_t *);
1443 extern	int	__lwp_rwlock_trywrlock(rwlock_t *);
1444 extern	int	__lwp_rwlock_unlock(rwlock_t *);
1445 extern	int	__lwp_park(timespec_t *, lwpid_t);
1446 extern	int	__lwp_unpark(lwpid_t);
1447 extern	int	__lwp_unpark_all(lwpid_t *, int);
1448 #if defined(__x86)
1449 extern	int	___lwp_private(int, int, void *);
1450 #endif	/* __x86 */
1451 
1452 /*
1453  * inlines
1454  */
1455 extern	int		set_lock_byte(volatile uint8_t *);
1456 extern	uint32_t	atomic_swap_32(volatile uint32_t *, uint32_t);
1457 extern	uint32_t	atomic_cas_32(volatile uint32_t *, uint32_t, uint32_t);
1458 extern	void		atomic_inc_32(volatile uint32_t *);
1459 extern	void		atomic_dec_32(volatile uint32_t *);
1460 extern	void		atomic_and_32(volatile uint32_t *, uint32_t);
1461 extern	void		atomic_or_32(volatile uint32_t *, uint32_t);
1462 #if defined(__sparc)
1463 extern	ulong_t		caller(void);
1464 extern	ulong_t		getfp(void);
1465 #endif	/* __sparc */
1466 
1467 #include "thr_inlines.h"
1468 
1469 #endif	/* _THR_UBERDATA_H */
1470