lib/libthread_xu/thread/thr_private.h

   1 /*
   2  * Copyright (C) 2005 Daniel M. Eischen <deischen@freebsd.org>
   3  * Copyright (c) 2005 David Xu <davidxu@freebsd.org>
   4  * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>.
   5  *
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * $FreeBSD: head/lib/libthr/thread/thr_private.h 217706 2010-08-23 $
  29  */
  30
  31 /*
  32  * Private thread definitions for the uthread kernel.
  33  */
  34
  35 #ifndef _THR_PRIVATE_H
  36 #define _THR_PRIVATE_H
  37
  38 /*
  39  * Include files.
  40  */
  41 #include <sys/types.h>
  42 #include <sys/time.h>
  43 #include <sys/cdefs.h>
  44 #include <sys/queue.h>
  45 #include <sys/rtprio.h>
  46 #include <sys/mman.h>
  47 #include <machine/atomic.h>
  48 #include <errno.h>
  49 #include <limits.h>
  50 #include <signal.h>
  51 #include <sys/cpumask.h>
  52 #include <sys/sched.h>
  53 #include <stdarg.h>
  54 #include <unistd.h>
  55 #include <pthread.h>
  56 #include <pthread_np.h>
  57
  58 #if defined(_PTHREADS_DEBUGGING) || defined(_PTHREADS_DEBUGGING2)
  59 void    _thr_log(const char *buf, size_t bytes);
  60 #endif
  61
  62 #include "pthread_md.h"
  63 #include "thr_umtx.h"
  64 #include "thread_db.h"
  65
  66 /* Signal to do cancellation */
  67 #define SIGCANCEL               32
  68
  69 /*
  70  * Kernel fatal error handler macro.
  71  */
  72 #define PANIC(args...)          _thread_exitf(__FILE__, __LINE__, ##args)
  73
  74 /* Output debug messages like this: */
  75 #define stdout_debug(args...)   _thread_printf(STDOUT_FILENO, ##args)
  76 #define stderr_debug(args...)   _thread_printf(STDERR_FILENO, ##args)
  77
  78 #ifdef _PTHREADS_INVARIANTS
  79 #define THR_ASSERT(cond, msg) do {      \
  80         if (__predict_false(!(cond)))   \
  81                 PANIC(msg);             \
  82 } while (0)
  83 #else
  84 #define THR_ASSERT(cond, msg)
  85 #endif
  86
  87 #ifdef PIC
  88 #define STATIC_LIB_REQUIRE(name)
  89 #else
  90 #define STATIC_LIB_REQUIRE(name)        __asm(".globl " #name)
  91 #endif
  92
  93 typedef TAILQ_HEAD(thread_head, __pthread_s)    thread_head;
  94 typedef TAILQ_HEAD(atfork_head, pthread_atfork) atfork_head;
  95
  96 struct __pthread_mutex_s {
  97         /*
  98          * Lock for accesses to this structure.
  99          */
 100         volatile umtx_t                 m_lock;
 101 #ifdef _PTHREADS_DEBUGGING2
 102         int                             m_lastop[32];
 103 #endif
 104         enum pthread_mutextype          m_type;
 105         int                             m_protocol;
 106         TAILQ_HEAD(mutex_head, __pthread_s) m_queue;
 107         struct __pthread_s                      *m_owner;
 108         long                            m_flags;
 109         int                             m_count;
 110         int                             m_refcount;
 111
 112         /*
 113          * Used for priority inheritance and protection.
 114          *
 115          *   m_prio       - For priority inheritance, the highest active
 116          *                  priority (threads locking the mutex inherit
 117          *                  this priority).  For priority protection, the
 118          *                  ceiling priority of this mutex.
 119          *   m_saved_prio - mutex owners inherited priority before
 120          *                  taking the mutex, restored when the owner
 121          *                  unlocks the mutex.
 122          */
 123         int                             m_prio;
 124         int                             m_saved_prio;
 125
 126         /*
 127          * Link for list of all mutexes a thread currently owns.
 128          */
 129         TAILQ_ENTRY(__pthread_mutex_s)  m_qe;
 130 };
 131
 132 #define TAILQ_INITIALIZER       { NULL, NULL }
 133
 134 #define PTHREAD_MUTEX_STATIC_INITIALIZER                \
 135         {       .m_lock = 0,                            \
 136                 .m_type = PTHREAD_MUTEX_DEFAULT,        \
 137                 .m_protocol = PTHREAD_PRIO_NONE,        \
 138                 .m_queue = TAILQ_INITIALIZER,           \
 139                 .m_flags = MUTEX_FLAGS_PRIVATE          \
 140         }
 141 /*
 142  * Flags for mutexes.
 143  */
 144 #define MUTEX_FLAGS_PRIVATE     0x01
 145 #define MUTEX_FLAGS_INITED      0x02
 146
 147 struct __pthread_mutexattr_s {
 148         enum pthread_mutextype  m_type;
 149         int                     m_protocol;
 150         int                     m_ceiling;
 151         int                     m_flags;
 152 };
 153
 154 #define PTHREAD_MUTEXATTR_STATIC_INITIALIZER \
 155         { PTHREAD_MUTEX_DEFAULT, PTHREAD_PRIO_NONE, 0, MUTEX_FLAGS_PRIVATE }
 156
 157 struct cond_cancel_info;
 158
 159 struct __pthread_cond_s {
 160         /*
 161          * Lock for accesses to this structure.
 162          */
 163         volatile umtx_t c_lock;
 164         volatile int    c_unused01;
 165         int             c_pshared;
 166         int             c_clockid;
 167         TAILQ_HEAD(, cond_cancel_info)  c_waitlist;
 168 };
 169
 170 struct __pthread_condattr_s {
 171         int             c_pshared;
 172         int             c_clockid;
 173 };
 174
 175 /*
 176  * Flags for condition variables.
 177  */
 178 #define COND_FLAGS_PRIVATE      0x01
 179 #define COND_FLAGS_INITED       0x02
 180
 181 struct __pthread_barrier_s {
 182         volatile umtx_t b_lock;
 183         volatile umtx_t b_cycle;
 184         volatile int    b_count;
 185         volatile int    b_waiters;
 186 };
 187
 188 struct __pthread_barrierattr_s {
 189         int             pshared;
 190 };
 191
 192 struct __pthread_spinlock_s {
 193         volatile umtx_t s_lock;
 194 };
 195
 196 /*
 197  * Cleanup definitions.
 198  */
 199 struct pthread_cleanup {
 200         struct pthread_cleanup  *next;
 201         void                    (*routine)(void *);
 202         void                    *routine_arg;
 203         int                     onstack;
 204 };
 205
 206 #define THR_CLEANUP_PUSH(td, func, arg) {               \
 207         struct pthread_cleanup __cup;                   \
 208                                                         \
 209         __cup.routine = func;                           \
 210         __cup.routine_arg = arg;                        \
 211         __cup.onstack = 1;                              \
 212         __cup.next = (td)->cleanup;                     \
 213         (td)->cleanup = &__cup;
 214
 215 #define THR_CLEANUP_POP(td, exec)                       \
 216         (td)->cleanup = __cup.next;                     \
 217         if ((exec) != 0)                                \
 218                 __cup.routine(__cup.routine_arg);       \
 219 }
 220
 221 struct pthread_atfork {
 222         TAILQ_ENTRY(pthread_atfork) qe;
 223         void (*prepare)(void);
 224         void (*parent)(void);
 225         void (*child)(void);
 226 };
 227
 228 struct __pthread_attr_s {
 229         int     sched_policy;
 230         int     sched_inherit;
 231         int     prio;
 232         int     suspend;
 233 #define THR_STACK_USER          0x100   /* 0xFF reserved for <pthread.h> */
 234 #define THR_CPUMASK             0x200   /* cpumask is valid */
 235         int     flags;
 236         void    *stackaddr_attr;
 237         size_t  stacksize_attr;
 238         size_t  guardsize_attr;
 239         cpumask_t cpumask;
 240 };
 241
 242 /*
 243  * Thread creation state attributes.
 244  */
 245 #define THR_CREATE_RUNNING              0
 246 #define THR_CREATE_SUSPENDED            1
 247
 248 /*
 249  * Miscellaneous definitions.
 250  */
 251 #define THR_STACK_DEFAULT               (sizeof(void *) / 4 * 1024 * 1024)
 252
 253 /*
 254  * Maximum size of initial thread's stack.  This perhaps deserves to be larger
 255  * than the stacks of other threads, since many applications are likely to run
 256  * almost entirely on this stack.
 257  */
 258 #define THR_STACK_INITIAL               (THR_STACK_DEFAULT * 2)
 259
 260 /*
 261  * Define the different priority ranges.  All applications have thread
 262  * priorities constrained within 0-31.  The threads library raises the
 263  * priority when delivering signals in order to ensure that signal
 264  * delivery happens (from the POSIX spec) "as soon as possible".
 265  * In the future, the threads library will also be able to map specific
 266  * threads into real-time (cooperating) processes or kernel threads.
 267  * The RT and SIGNAL priorities will be used internally and added to
 268  * thread base priorities so that the scheduling queue can handle both
 269  * normal and RT priority threads with and without signal handling.
 270  *
 271  * The approach taken is that, within each class, signal delivery
 272  * always has priority over thread execution.
 273  */
 274 #define THR_DEFAULT_PRIORITY            0
 275 #define THR_MUTEX_CEIL_PRIORITY         31      /* dummy */
 276
 277 /*
 278  * Time slice period in microseconds.
 279  */
 280 #define TIMESLICE_USEC                          20000
 281
 282 struct __pthread_rwlockattr_s {
 283         int             pshared;
 284 };
 285
 286 struct __pthread_rwlock_s {
 287         pthread_mutex_t lock;   /* monitor lock */
 288         pthread_cond_t  read_signal;
 289         pthread_cond_t  write_signal;
 290         int             state;  /* 0 = idle  >0 = # of readers  -1 = writer */
 291         int             blocked_writers;
 292 };
 293
 294 /*
 295  * Thread states.
 296  */
 297 enum pthread_state {
 298         PS_RUNNING,
 299         PS_DEAD
 300 };
 301
 302 struct pthread_specific_elem {
 303         const void      *data;
 304         int             seqno;
 305 };
 306
 307 struct pthread_key {
 308         volatile int    allocated;
 309         volatile int    count;
 310         int             seqno;
 311         void            (*destructor)(void *);
 312 };
 313
 314 /*
 315  * Thread structure.
 316  */
 317 struct __pthread_s {
 318         /*
 319          * Magic value to help recognize a valid thread structure
 320          * from an invalid one:
 321          */
 322 #define THR_MAGIC               ((u_int32_t) 0xd09ba115)
 323         u_int32_t               magic;
 324         char                    *name;
 325         u_int64_t               uniqueid; /* for gdb */
 326
 327         /*
 328          * Lock for accesses to this thread structure.
 329          */
 330         umtx_t                  lock;
 331
 332         /* Thread is terminated in kernel, written by kernel. */
 333         long                    terminated;
 334
 335         /* Kernel thread id. */
 336         lwpid_t                 tid;
 337
 338         /* Internal condition variable cycle number. */
 339         umtx_t                  cycle;
 340
 341         /* How many low level locks the thread held. */
 342         int                     locklevel;
 343
 344         /*
 345          * Set to non-zero when this thread has entered a critical
 346          * region.  We allow for recursive entries into critical regions.
 347          */
 348         int                     critical_count;
 349
 350         /* Signal blocked counter. */
 351         int                     sigblock;
 352
 353         /* Queue entry for list of all threads. */
 354         TAILQ_ENTRY(__pthread_s) tle;   /* link for all threads in process */
 355
 356         /* Queue entry for GC lists. */
 357         TAILQ_ENTRY(__pthread_s) gcle;
 358
 359         /* Hash queue entry. */
 360         LIST_ENTRY(__pthread_s) hle;
 361
 362         /* Threads reference count. */
 363         int                     refcount;
 364
 365         /*
 366          * Thread start routine, argument, stack pointer and thread
 367          * attributes.
 368          */
 369         void                    *(*start_routine)(void *);
 370         void                    *arg;
 371         struct __pthread_attr_s attr;
 372
 373         /*
 374          * Cancelability flags
 375          */
 376 #define THR_CANCEL_DISABLE              0x0001
 377 #define THR_CANCEL_EXITING              0x0002
 378 #define THR_CANCEL_AT_POINT             0x0004
 379 #define THR_CANCEL_NEEDED               0x0008
 380 #define SHOULD_CANCEL(val)                                      \
 381         (((val) & (THR_CANCEL_DISABLE | THR_CANCEL_EXITING |    \
 382                  THR_CANCEL_NEEDED)) == THR_CANCEL_NEEDED)
 383
 384 #define SHOULD_ASYNC_CANCEL(val)                                \
 385         (((val) & (THR_CANCEL_DISABLE | THR_CANCEL_EXITING |    \
 386                  THR_CANCEL_NEEDED | THR_CANCEL_AT_POINT)) ==   \
 387                  (THR_CANCEL_NEEDED | THR_CANCEL_AT_POINT))
 388         int                     cancelflags;
 389
 390         /* Thread temporary signal mask. */
 391         sigset_t                sigmask;
 392
 393         /* Thread state: */
 394         umtx_t                  state;
 395
 396         /*
 397          * Error variable used instead of errno, used for internal.
 398          */
 399         int                     error;
 400
 401         /*
 402          * The joiner is the thread that is joining to this thread.  The
 403          * join status keeps track of a join operation to another thread.
 404          */
 405         struct __pthread_s      *joiner;
 406
 407         /*
 408          * The current thread can belong to a priority mutex queue.
 409          * This is the synchronization queue link.
 410          */
 411         TAILQ_ENTRY(__pthread_s) sqe;
 412
 413         /* Miscellaneous flags; only set with scheduling lock held. */
 414         int                     flags;
 415 #define THR_FLAGS_PRIVATE       0x0001
 416 #define THR_FLAGS_NEED_SUSPEND  0x0002  /* thread should be suspended */
 417 #define THR_FLAGS_SUSPENDED     0x0004  /* thread is suspended */
 418
 419         /* Thread list flags; only set with thread list lock held. */
 420         int                     tlflags;
 421 #define TLFLAGS_GC_SAFE         0x0001  /* thread safe for cleaning */
 422 #define TLFLAGS_IN_TDLIST       0x0002  /* thread in all thread list */
 423 #define TLFLAGS_IN_GCLIST       0x0004  /* thread in gc list */
 424 #define TLFLAGS_DETACHED        0x0008  /* thread is detached */
 425
 426         /*
 427          * Base priority is the user setable and retrievable priority
 428          * of the thread.  It is only affected by explicit calls to
 429          * set thread priority and upon thread creation via a thread
 430          * attribute or default priority.
 431          */
 432         char                    base_priority;
 433
 434         /*
 435          * Inherited priority is the priority a thread inherits by
 436          * taking a priority inheritance or protection mutex.  It
 437          * is not affected by base priority changes.  Inherited
 438          * priority defaults to and remains 0 until a mutex is taken
 439          * that is being waited on by any other thread whose priority
 440          * is non-zero.
 441          */
 442         char                    inherited_priority;
 443
 444         /*
 445          * Active priority is always the maximum of the threads base
 446          * priority and inherited priority.  When there is a change
 447          * in either the base or inherited priority, the active
 448          * priority must be recalculated.
 449          */
 450         char                    active_priority;
 451
 452         /* Number of priority ceiling or protection mutexes owned. */
 453         int                     priority_mutex_count;
 454
 455         /* Queue of currently owned simple type mutexes. */
 456         TAILQ_HEAD(, __pthread_mutex_s) mutexq;
 457
 458         void                            *ret;
 459         struct pthread_specific_elem    *specific;
 460         int                             specific_data_count;
 461
 462         /* Number rwlocks rdlocks held. */
 463         int                     rdlock_count;
 464
 465         /*
 466          * Current locks bitmap for rtld. */
 467         int                     rtld_bits;
 468
 469         /* Thread control block */
 470         struct tls_tcb          *tcb;
 471
 472         /* Cleanup handlers Link List */
 473         struct pthread_cleanup  *cleanup;
 474
 475         /* Enable event reporting */
 476         int                     report_events;
 477
 478         /* Event mask */
 479         td_thr_events_t         event_mask;
 480
 481         /* Event */
 482         td_event_msg_t          event_buf;
 483 };
 484
 485 #define THR_IN_CRITICAL(thrd)                           \
 486         (((thrd)->locklevel > 0) ||                     \
 487         ((thrd)->critical_count > 0))
 488
 489 /*
 490  * Internal temporary locks without suspend check
 491  */
 492 #define THR_UMTX_TRYLOCK(thrd, lck)                     \
 493         _thr_umtx_trylock((lck), (thrd)->tid, 1)
 494
 495 #define THR_UMTX_LOCK(thrd, lck)                        \
 496         _thr_umtx_lock((lck), (thrd)->tid, 1)
 497
 498 #define THR_UMTX_TIMEDLOCK(thrd, lck, timo)             \
 499         _thr_umtx_timedlock((lck), (thrd)->tid, (timo), 1)
 500
 501 #define THR_UMTX_UNLOCK(thrd, lck)                      \
 502         _thr_umtx_unlock((lck), (thrd)->tid, 1)
 503
 504 /*
 505  * Interal locks without suspend check, used when the lock
 506  * state needs to persist (i.e. to help implement things
 507  * like pthread_mutex_lock()).  Non-temporary.
 508  */
 509 #define THR_UMTX_TRYLOCK_PERSIST(thrd, lck)             \
 510         _thr_umtx_trylock((lck), (thrd)->tid, 0)
 511
 512 #define THR_UMTX_LOCK_PERSIST(thrd, lck)                \
 513         _thr_umtx_lock((lck), (thrd)->tid, 0)
 514
 515 #define THR_UMTX_TIMEDLOCK_PERSIST(thrd, lck, timo)     \
 516         _thr_umtx_timedlock((lck), (thrd)->tid, (timo), 0)
 517
 518 #define THR_UMTX_UNLOCK_PERSIST(thrd, lck)              \
 519         _thr_umtx_unlock((lck), (thrd)->tid, 0)
 520
 521 /*
 522  * Internal temporary locks with suspend check
 523  */
 524 #define THR_LOCK_ACQUIRE(thrd, lck)                     \
 525 do {                                                    \
 526         (thrd)->locklevel++;                            \
 527         _thr_umtx_lock((lck), (thrd)->tid, 1);          \
 528 } while (0)
 529
 530 #ifdef  _PTHREADS_INVARIANTS
 531 #define THR_ASSERT_LOCKLEVEL(thrd)                      \
 532 do {                                                    \
 533         if (__predict_false((thrd)->locklevel <= 0))    \
 534                 _thr_assert_lock_level();               \
 535 } while (0)
 536 #else
 537 #define THR_ASSERT_LOCKLEVEL(thrd)
 538 #endif
 539
 540 #define THR_LOCK_RELEASE(thrd, lck)                     \
 541 do {                                                    \
 542         THR_ASSERT_LOCKLEVEL(thrd);                     \
 543         _thr_umtx_unlock((lck), (thrd)->tid, 1);        \
 544         (thrd)->locklevel--;                            \
 545         _thr_ast(thrd);                                 \
 546 } while (0)
 547
 548 #define THR_LOCK(curthrd)               THR_LOCK_ACQUIRE(curthrd, &(curthrd)->lock)
 549 #define THR_UNLOCK(curthrd)             THR_LOCK_RELEASE(curthrd, &(curthrd)->lock)
 550 #define THR_THREAD_LOCK(curthrd, thr)   THR_LOCK_ACQUIRE(curthrd, &(thr)->lock)
 551 #define THR_THREAD_UNLOCK(curthrd, thr) THR_LOCK_RELEASE(curthrd, &(thr)->lock)
 552
 553 #define THREAD_LIST_LOCK(curthrd)                               \
 554 do {                                                            \
 555         THR_LOCK_ACQUIRE((curthrd), &_thr_list_lock);           \
 556 } while (0)
 557
 558 #define THREAD_LIST_UNLOCK(curthrd)                             \
 559 do {                                                            \
 560         THR_LOCK_RELEASE((curthrd), &_thr_list_lock);           \
 561 } while (0)
 562
 563 /*
 564  * Macros to insert/remove threads to the all thread list and
 565  * the gc list.
 566  */
 567 #define THR_LIST_ADD(thrd) do {                                 \
 568         if (((thrd)->tlflags & TLFLAGS_IN_TDLIST) == 0) {       \
 569                 TAILQ_INSERT_HEAD(&_thread_list, thrd, tle);    \
 570                 _thr_hash_add(thrd);                            \
 571                 (thrd)->tlflags |= TLFLAGS_IN_TDLIST;           \
 572         }                                                       \
 573 } while (0)
 574 #define THR_LIST_REMOVE(thrd) do {                              \
 575         if (((thrd)->tlflags & TLFLAGS_IN_TDLIST) != 0) {       \
 576                 TAILQ_REMOVE(&_thread_list, thrd, tle);         \
 577                 _thr_hash_remove(thrd);                         \
 578                 (thrd)->tlflags &= ~TLFLAGS_IN_TDLIST;          \
 579         }                                                       \
 580 } while (0)
 581 #define THR_GCLIST_ADD(thrd) do {                               \
 582         if (((thrd)->tlflags & TLFLAGS_IN_GCLIST) == 0) {       \
 583                 TAILQ_INSERT_HEAD(&_thread_gc_list, thrd, gcle);\
 584                 (thrd)->tlflags |= TLFLAGS_IN_GCLIST;           \
 585                 _thr_gc_count++;                                        \
 586         }                                                       \
 587 } while (0)
 588 #define THR_GCLIST_REMOVE(thrd) do {                            \
 589         if (((thrd)->tlflags & TLFLAGS_IN_GCLIST) != 0) {       \
 590                 TAILQ_REMOVE(&_thread_gc_list, thrd, gcle);     \
 591                 (thrd)->tlflags &= ~TLFLAGS_IN_GCLIST;          \
 592                 _thr_gc_count--;                                        \
 593         }                                                       \
 594 } while (0)
 595
 596 #define GC_NEEDED()     (_thr_gc_count >= 5)
 597
 598 #define THR_IN_SYNCQ(thrd)      (((thrd)->sflags & THR_FLAGS_IN_SYNCQ) != 0)
 599
 600 #define SHOULD_REPORT_EVENT(curthr, e)                  \
 601         (curthr->report_events &&                       \
 602          (((curthr)->event_mask | _thread_event_mask ) & e) != 0)
 603
 604 #ifndef __LIBC_ISTHREADED_DECLARED
 605 #define __LIBC_ISTHREADED_DECLARED
 606 extern int __isthreaded;
 607 #endif
 608
 609 /*
 610  * Global variables for the pthread library.
 611  */
 612 extern char             *_usrstack;
 613 extern pthread_t        _thr_initial;
 614
 615 /* For debugger */
 616 extern int              _libthread_xu_debug;
 617 extern int              _thread_event_mask;
 618 extern pthread_t        _thread_last_event;
 619
 620 /* List of all threads */
 621 extern struct thread_head       _thread_list;
 622
 623 /* List of threads needing GC */
 624 extern struct thread_head       _thread_gc_list;
 625
 626 extern int      _thread_active_threads;
 627
 628 extern struct   atfork_head     _thr_atfork_list;
 629 extern struct   atfork_head     _thr_atfork_kern_list;
 630 extern umtx_t   _thr_atfork_lock;
 631
 632 /* Default thread attributes */
 633 extern struct __pthread_attr_s _pthread_attr_default;
 634
 635 /* Default mutex attributes */
 636 extern struct __pthread_mutexattr_s _pthread_mutexattr_default;
 637
 638 /* Default condition variable attributes */
 639 extern struct __pthread_condattr_s _pthread_condattr_default;
 640
 641 extern pid_t    _thr_pid;
 642 extern size_t   _thr_guard_default;
 643 extern size_t   _thr_stack_default;
 644 extern size_t   _thr_stack_initial;
 645 extern int      _thr_page_size;
 646 extern int      _thr_gc_count;
 647
 648 extern umtx_t   _mutex_static_lock;
 649 extern umtx_t   _cond_static_lock;
 650 extern umtx_t   _rwlock_static_lock;
 651 extern umtx_t   _keytable_lock;
 652 extern umtx_t   _thr_list_lock;
 653 extern umtx_t   _thr_event_lock;
 654
 655 /*
 656  * Function prototype definitions.
 657  */
 658 __BEGIN_DECLS
 659 int     _thr_setthreaded(int);
 660 int     _mutex_cv_lock(pthread_mutex_t *, int count);
 661 int     _mutex_cv_unlock(pthread_mutex_t *, int *count);
 662 void    _mutex_notify_priochange(pthread_t, pthread_t, int);
 663 void    _mutex_fork(pthread_t, lwpid_t tid);
 664 void    _mutex_unlock_private(pthread_t);
 665
 666 #if 0
 667 int     _mutex_reinit(pthread_mutex_t *);
 668 void    _cond_reinit(pthread_cond_t pcond);
 669 void    _rwlock_reinit(pthread_rwlock_t prwlock);
 670 #endif
 671
 672 void    _libpthread_init(pthread_t);
 673 pthread_t _thr_alloc(pthread_t);
 674 void    _thread_exit(const char *, int, const char *) __dead2;
 675 void    _thread_exitf(const char *, int, const char *, ...) __dead2
 676             __printflike(3, 4);
 677 void    _thr_exit_cleanup(void);
 678 void    _thr_atfork_kern(void (*prepare)(void), void (*parent)(void),
 679                         void (*child)(void));
 680 int     _thr_ref_add(pthread_t, pthread_t, int);
 681 void    _thr_ref_delete(pthread_t, pthread_t);
 682 void    _thr_ref_delete_unlocked(pthread_t, pthread_t);
 683 int     _thr_find_thread(pthread_t, pthread_t, int);
 684 void    _thr_malloc_init(void);
 685 void    _rtld_setthreaded(int);
 686 void    _thr_rtld_init(void);
 687 void    _thr_rtld_fini(void);
 688 int     _thr_stack_alloc(pthread_attr_t);
 689 void    _thr_stack_free(pthread_attr_t);
 690 void    _thr_stack_cleanup(void);
 691 void    _thr_sem_init(void);
 692 void    _thr_free(pthread_t, pthread_t);
 693 void    _thr_gc(pthread_t);
 694 void    _thread_cleanupspecific(void);
 695 void    _thread_dump_info(void);
 696 void    _thread_printf(int, const char *, ...) __printflike(2, 3);
 697 void    _thread_vprintf(int, const char *, va_list);
 698 void    _thr_spinlock_init(void);
 699 int     _thr_cancel_enter(pthread_t);
 700 void    _thr_cancel_leave(pthread_t, int);
 701 void    _thr_signal_block(pthread_t);
 702 void    _thr_signal_unblock(pthread_t);
 703 void    _thr_signal_init(void);
 704 void    _thr_signal_deinit(void);
 705 int     _thr_send_sig(pthread_t, int sig);
 706 void    _thr_list_init(void);
 707 void    _thr_hash_add(pthread_t);
 708 void    _thr_hash_remove(pthread_t);
 709 pthread_t _thr_hash_find(pthread_t);
 710 void    _thr_link(pthread_t, pthread_t);
 711 void    _thr_unlink(pthread_t, pthread_t);
 712 void    _thr_suspend_check(pthread_t);
 713 void    _thr_assert_lock_level(void) __dead2;
 714 void    _thr_ast(pthread_t);
 715 int     _thr_get_tid(void);
 716 void    _thr_report_creation(pthread_t, pthread_t);
 717 void    _thr_report_death(pthread_t);
 718 void    _thread_bp_create(void);
 719 void    _thread_bp_death(void);
 720 int     _thr_getscheduler(lwpid_t, int *, struct sched_param *);
 721 int     _thr_setscheduler(lwpid_t, int, const struct sched_param *);
 722 int     _thr_set_sched_other_prio(pthread_t, int);
 723 int     _rtp_to_schedparam(const struct rtprio *rtp, int *policy,
 724             struct sched_param *param);
 725 int     _schedparam_to_rtp(int policy, const struct sched_param *param,
 726             struct rtprio *rtp);
 727 int     _umtx_sleep_err(volatile const int *, int, int);
 728 int     _umtx_wakeup_err(volatile const int *, int);
 729
 730 /* #include <fcntl.h> */
 731 #ifdef  _SYS_FCNTL_H_
 732 int     __sys_fcntl(int, int, ...);
 733 int     __sys_open(const char *, int, ...);
 734 int     __sys_openat(int, const char *, int, ...);
 735 #endif
 736
 737 /* #include <sys/ioctl.h> */
 738 #ifdef _SYS_IOCTL_H_
 739 int     __sys_ioctl(int, unsigned long, ...);
 740 #endif
 741
 742 /* #include <sched.h> */
 743 #ifdef  _SYS_SCHED_H_
 744 int     __sys_sched_yield(void);
 745 #endif
 746
 747 /* #include <signal.h> */
 748 #ifdef _SIGNAL_H_
 749 int     __sys_sigaction(int, const struct sigaction *, struct sigaction *);
 750 int     __sys_sigprocmask(int, const sigset_t *, sigset_t *);
 751 int     __sys_sigsuspend(const sigset_t *);
 752 #endif
 753
 754 /* #include <time.h> */
 755 #ifdef  _TIME_H_
 756 int     __sys_nanosleep(const struct timespec *, struct timespec *);
 757 int     __sys_clock_nanosleep(clockid_t, int, const struct timespec *,
 758                 struct timespec *);
 759 #endif
 760
 761 /* #include <unistd.h> */
 762 #ifdef  _UNISTD_H_
 763 int     __sys_close(int);
 764 pid_t   __sys_getpid(void);
 765 ssize_t __sys_read(int, void *, size_t);
 766 ssize_t __sys_write(int, const void *, size_t);
 767 int     __sys_sigtimedwait(const sigset_t *, siginfo_t *,
 768                 const struct timespec *);
 769 int     __sys_sigwaitinfo(const sigset_t *set, siginfo_t *info);
 770 #endif
 771
 772 static inline int
 773 _thr_isthreaded(void)
 774 {
 775         return (__isthreaded != 0);
 776 }
 777
 778 static inline int
 779 _thr_is_inited(void)
 780 {
 781         return (_thr_initial != NULL);
 782 }
 783
 784 static inline void
 785 _thr_check_init(void)
 786 {
 787         if (_thr_initial == NULL)
 788                 _libpthread_init(NULL);
 789 }
 790
 791 struct dl_phdr_info;
 792 void __pthread_cxa_finalize(struct dl_phdr_info *phdr_info);
 793
 794 /*
 795  * Used in low-level init to directly call libc's malloc implementation
 796  * instead of a potentially third-party malloc implementation.  Required
 797  * for bootstrapping pthreads.
 798  */
 799 void *__malloc(size_t bytes);
 800 void __free(void *ptr);
 801
 802 __END_DECLS
 803
 804 #endif  /* !_THR_PRIVATE_H */