linuxthreads/internals.h

   1 /* Linuxthreads - a simple clone()-based implementation of Posix        */
   2 /* threads for Linux.                                                   */
   3 /* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr)              */
   4 /*                                                                      */
   5 /* This program is free software; you can redistribute it and/or        */
   6 /* modify it under the terms of the GNU Library General Public License  */
   7 /* as published by the Free Software Foundation; either version 2       */
   8 /* of the License, or (at your option) any later version.               */
   9 /*                                                                      */
  10 /* This program is distributed in the hope that it will be useful,      */
  11 /* but WITHOUT ANY WARRANTY; without even the implied warranty of       */
  12 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        */
  13 /* GNU Library General Public License for more details.                 */
  14
  15 #ifndef _INTERNALS_H
  16 #define _INTERNALS_H    1
  17
  18 /* Internal data structures */
  19
  20 /* Includes */
  21
  22 #include <limits.h>
  23 #include <resolv.h>
  24 #include <setjmp.h>
  25 #include <signal.h>
  26 #include <unistd.h>
  27 #include <sys/types.h>
  28 #include <bits/libc-tsd.h> /* for _LIBC_TSD_KEY_N */
  29
  30 extern long int testandset (int *spinlock);
  31 extern int __compare_and_swap (long int *p, long int oldval, long int newval);
  32
  33 #include "pt-machine.h"
  34 #include "semaphore.h"
  35 #include "../linuxthreads_db/thread_dbP.h"
  36
  37 #ifndef THREAD_GETMEM
  38 # define THREAD_GETMEM(descr, member) descr->member
  39 #endif
  40 #ifndef THREAD_GETMEM_NC
  41 # define THREAD_GETMEM_NC(descr, member) descr->member
  42 #endif
  43 #ifndef THREAD_SETMEM
  44 # define THREAD_SETMEM(descr, member, value) descr->member = (value)
  45 #endif
  46 #ifndef THREAD_SETMEM_NC
  47 # define THREAD_SETMEM_NC(descr, member, value) descr->member = (value)
  48 #endif
  49
  50 /* Arguments passed to thread creation routine */
  51
  52 struct pthread_start_args {
  53   void * (*start_routine)(void *); /* function to run */
  54   void * arg;                   /* its argument */
  55   sigset_t mask;                /* initial signal mask for thread */
  56   int schedpolicy;              /* initial scheduling policy (if any) */
  57   struct sched_param schedparam; /* initial scheduling parameters (if any) */
  58 };
  59
  60
  61 /* We keep thread specific data in a special data structure, a two-level
  62    array.  The top-level array contains pointers to dynamically allocated
  63    arrays of a certain number of data pointers.  So we can implement a
  64    sparse array.  Each dynamic second-level array has
  65         PTHREAD_KEY_2NDLEVEL_SIZE
  66    entries.  This value shouldn't be too large.  */
  67 #define PTHREAD_KEY_2NDLEVEL_SIZE       32
  68
  69 /* We need to address PTHREAD_KEYS_MAX key with PTHREAD_KEY_2NDLEVEL_SIZE
  70    keys in each subarray.  */
  71 #define PTHREAD_KEY_1STLEVEL_SIZE \
  72   ((PTHREAD_KEYS_MAX + PTHREAD_KEY_2NDLEVEL_SIZE - 1) \
  73    / PTHREAD_KEY_2NDLEVEL_SIZE)
  74
  75 typedef void (*destr_function)(void *);
  76
  77 struct pthread_key_struct {
  78   int in_use;                   /* already allocated? */
  79   destr_function destr;         /* destruction routine */
  80 };
  81
  82
  83 #define PTHREAD_START_ARGS_INITIALIZER(fct) \
  84   { (void *(*) (void *)) fct, NULL, {{0, }}, 0, { 0 } }
  85
  86 /* The type of thread descriptors */
  87
  88 typedef struct _pthread_descr_struct * pthread_descr;
  89
  90 /* Callback interface for removing the thread from waiting on an
  91    object if it is cancelled while waiting or about to wait.
  92    This hold a pointer to the object, and a pointer to a function
  93    which ``extricates'' the thread from its enqueued state.
  94    The function takes two arguments: pointer to the wait object,
  95    and a pointer to the thread. It returns 1 if an extrication
  96    actually occured, and hence the thread must also be signalled.
  97    It returns 0 if the thread had already been extricated. */
  98
  99 typedef struct _pthread_extricate_struct {
 100     void *pu_object;
 101     int (*pu_extricate_func)(void *, pthread_descr);
 102 } pthread_extricate_if;
 103
 104 /* Atomic counter made possible by compare_and_swap */
 105
 106 struct pthread_atomic {
 107   long p_count;
 108   int p_spinlock;
 109 };
 110
 111 /* Context info for read write locks. The pthread_rwlock_info structure
 112    is information about a lock that has been read-locked by the thread
 113    in whose list this structure appears. The pthread_rwlock_context
 114    is embedded in the thread context and contains a pointer to the
 115    head of the list of lock info structures, as well as a count of
 116    read locks that are untracked, because no info structure could be
 117    allocated for them. */
 118
 119 struct _pthread_rwlock_t;
 120
 121 typedef struct _pthread_rwlock_info {
 122   struct _pthread_rwlock_info *pr_next;
 123   struct _pthread_rwlock_t *pr_lock;
 124   int pr_lock_count;
 125 } pthread_readlock_info;
 126
 127 struct _pthread_descr_struct {
 128   union {
 129     struct {
 130       pthread_descr self;       /* Pointer to this structure */
 131     } data;
 132     void *__padding[16];
 133   } p_header;
 134   pthread_descr p_nextlive, p_prevlive;
 135                                 /* Double chaining of active threads */
 136   pthread_descr p_nextwaiting;  /* Next element in the queue holding the thr */
 137   pthread_descr p_nextlock;     /* can be on a queue and waiting on a lock */
 138   pthread_t p_tid;              /* Thread identifier */
 139   int p_pid;                    /* PID of Unix process */
 140   int p_priority;               /* Thread priority (== 0 if not realtime) */
 141   struct _pthread_fastlock * p_lock; /* Spinlock for synchronized accesses */
 142   int p_signal;                 /* last signal received */
 143   sigjmp_buf * p_signal_jmp;    /* where to siglongjmp on a signal or NULL */
 144   sigjmp_buf * p_cancel_jmp;    /* where to siglongjmp on a cancel or NULL */
 145   char p_terminated;            /* true if terminated e.g. by pthread_exit */
 146   char p_detached;              /* true if detached */
 147   char p_exited;                /* true if the assoc. process terminated */
 148   void * p_retval;              /* placeholder for return value */
 149   int p_retcode;                /* placeholder for return code */
 150   pthread_descr p_joining;      /* thread joining on that thread or NULL */
 151   struct _pthread_cleanup_buffer * p_cleanup; /* cleanup functions */
 152   char p_cancelstate;           /* cancellation state */
 153   char p_canceltype;            /* cancellation type (deferred/async) */
 154   char p_canceled;              /* cancellation request pending */
 155   int * p_errnop;               /* pointer to used errno variable */
 156   int p_errno;                  /* error returned by last system call */
 157   int * p_h_errnop;             /* pointer to used h_errno variable */
 158   int p_h_errno;                /* error returned by last netdb function */
 159   char * p_in_sighandler;       /* stack address of sighandler, or NULL */
 160   char p_sigwaiting;            /* true if a sigwait() is in progress */
 161   struct pthread_start_args p_start_args; /* arguments for thread creation */
 162   void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE]; /* thread-specific data */
 163   void * p_libc_specific[_LIBC_TSD_KEY_N]; /* thread-specific data for libc */
 164   int p_userstack;              /* nonzero if the user provided the stack */
 165   void *p_guardaddr;            /* address of guard area or NULL */
 166   size_t p_guardsize;           /* size of guard area */
 167   int p_nr;                     /* Index of descriptor in __pthread_handles */
 168   int p_report_events;          /* Nonzero if events must be reported.  */
 169   td_eventbuf_t p_eventbuf;     /* Data for event.  */
 170   struct pthread_atomic p_resume_count; /* number of times restart() was
 171                                            called on thread */
 172   char p_woken_by_cancel;       /* cancellation performed wakeup */
 173   char p_condvar_avail;         /* flag if conditional variable became avail */
 174   char p_sem_avail;             /* flag if semaphore became available */
 175   pthread_extricate_if *p_extricate; /* See above */
 176   pthread_readlock_info *p_readlock_list;  /* List of readlock info structs */
 177   pthread_readlock_info *p_readlock_free;  /* Free list of structs */
 178   int p_untracked_readlock_count;       /* Readlocks not tracked by list */
 179   struct __res_state *p_resp;   /* Pointer to resolver state */
 180   struct __res_state p_res;     /* per-thread resolver state */
 181   int p_inheritsched;           /* copied from the thread attribute */
 182   /* New elements must be added at the end.  */
 183 } __attribute__ ((aligned(32))); /* We need to align the structure so that
 184                                     doubles are aligned properly.  This is 8
 185                                     bytes on MIPS and 16 bytes on MIPS64.
 186                                     32 bytes might give better cache
 187                                     utilization.  */
 188
 189
 190 /* The type of thread handles. */
 191
 192 typedef struct pthread_handle_struct * pthread_handle;
 193
 194 struct pthread_handle_struct {
 195   struct _pthread_fastlock h_lock; /* Fast lock for sychronized access */
 196   pthread_descr h_descr;        /* Thread descriptor or NULL if invalid */
 197   char * h_bottom;              /* Lowest address in the stack thread */
 198 };
 199
 200 /* The type of messages sent to the thread manager thread */
 201
 202 struct pthread_request {
 203   pthread_descr req_thread;     /* Thread doing the request */
 204   enum {                        /* Request kind */
 205     REQ_CREATE, REQ_FREE, REQ_PROCESS_EXIT, REQ_MAIN_THREAD_EXIT,
 206     REQ_POST, REQ_DEBUG, REQ_KICK
 207   } req_kind;
 208   union {                       /* Arguments for request */
 209     struct {                    /* For REQ_CREATE: */
 210       const pthread_attr_t * attr; /* thread attributes */
 211       void * (*fn)(void *);     /*   start function */
 212       void * arg;               /*   argument to start function */
 213       sigset_t mask;            /*   signal mask */
 214     } create;
 215     struct {                    /* For REQ_FREE: */
 216       pthread_t thread_id;      /*   identifier of thread to free */
 217     } free;
 218     struct {                    /* For REQ_PROCESS_EXIT: */
 219       int code;                 /*   exit status */
 220     } exit;
 221     void * post;                /* For REQ_POST: the semaphore */
 222   } req_args;
 223 };
 224
 225
 226 /* Signals used for suspend/restart and for cancellation notification.  */
 227
 228 extern int __pthread_sig_restart;
 229 extern int __pthread_sig_cancel;
 230
 231 /* Signal used for interfacing with gdb */
 232
 233 extern int __pthread_sig_debug;
 234
 235 /* Global array of thread handles, used for validating a thread id
 236    and retrieving the corresponding thread descriptor. Also used for
 237    mapping the available stack segments. */
 238
 239 extern struct pthread_handle_struct __pthread_handles[PTHREAD_THREADS_MAX];
 240
 241 /* Descriptor of the initial thread */
 242
 243 extern struct _pthread_descr_struct __pthread_initial_thread;
 244
 245 /* Descriptor of the manager thread */
 246
 247 extern struct _pthread_descr_struct __pthread_manager_thread;
 248
 249 /* Descriptor of the main thread */
 250
 251 extern pthread_descr __pthread_main_thread;
 252
 253 /* Limit between the stack of the initial thread (above) and the
 254    stacks of other threads (below). Aligned on a STACK_SIZE boundary.
 255    Initially 0, meaning that the current thread is (by definition)
 256    the initial thread. */
 257
 258 extern char *__pthread_initial_thread_bos;
 259
 260 /* Indicate whether at least one thread has a user-defined stack (if 1),
 261    or all threads have stacks supplied by LinuxThreads (if 0). */
 262
 263 extern int __pthread_nonstandard_stacks;
 264
 265 /* File descriptor for sending requests to the thread manager.
 266    Initially -1, meaning that __pthread_initialize_manager must be called. */
 267
 268 extern int __pthread_manager_request;
 269
 270 /* Other end of the pipe for sending requests to the thread manager. */
 271
 272 extern int __pthread_manager_reader;
 273
 274 /* Limits of the thread manager stack. */
 275
 276 extern char *__pthread_manager_thread_bos;
 277 extern char *__pthread_manager_thread_tos;
 278
 279 #ifdef FLOATING_STACKS
 280 /* Maximum stack size.  */
 281 extern size_t __pthread_max_stacksize;
 282 #endif
 283
 284 /* Pending request for a process-wide exit */
 285
 286 extern int __pthread_exit_requested, __pthread_exit_code;
 287
 288 /* Set to 1 by gdb if we're debugging */
 289
 290 extern volatile int __pthread_threads_debug;
 291
 292 /* Globally enabled events.  */
 293 extern volatile td_thr_events_t __pthread_threads_events;
 294
 295 /* Pointer to descriptor of thread with last event.  */
 296 extern volatile pthread_descr __pthread_last_event;
 297
 298 /* Flag which tells whether we are executing on SMP kernel. */
 299 extern int __pthread_smp_kernel;
 300
 301 /* Return the handle corresponding to a thread id */
 302
 303 static inline pthread_handle thread_handle(pthread_t id)
 304 {
 305   return &__pthread_handles[id % PTHREAD_THREADS_MAX];
 306 }
 307
 308 /* Validate a thread handle. Must have acquired h->h_spinlock before. */
 309
 310 static inline int invalid_handle(pthread_handle h, pthread_t id)
 311 {
 312   return h->h_descr == NULL || h->h_descr->p_tid != id || h->h_descr->p_terminated;
 313 }
 314
 315 static inline int nonexisting_handle(pthread_handle h, pthread_t id)
 316 {
 317   return h->h_descr == NULL || h->h_descr->p_tid != id;
 318 }
 319
 320 /* Fill in defaults left unspecified by pt-machine.h.  */
 321
 322 /* We round up a value with page size. */
 323 #ifndef page_roundup
 324 #define page_roundup(v,p) ((((size_t) (v)) + (p) - 1) & ~((p) - 1))
 325 #endif
 326
 327 /* The page size we can get from the system.  This should likely not be
 328    changed by the machine file but, you never know.  */
 329 #ifndef PAGE_SIZE
 330 #define PAGE_SIZE  (sysconf (_SC_PAGE_SIZE))
 331 #endif
 332
 333 /* The max size of the thread stack segments.  If the default
 334    THREAD_SELF implementation is used, this must be a power of two and
 335    a multiple of PAGE_SIZE.  */
 336 #ifndef STACK_SIZE
 337 #define STACK_SIZE  (2 * 1024 * 1024)
 338 #endif
 339
 340 /* The initial size of the thread stack.  Must be a multiple of PAGE_SIZE.  */
 341 #ifndef INITIAL_STACK_SIZE
 342 #define INITIAL_STACK_SIZE  (4 * PAGE_SIZE)
 343 #endif
 344
 345 /* Size of the thread manager stack. The "- 32" avoids wasting space
 346    with some malloc() implementations. */
 347 #ifndef THREAD_MANAGER_STACK_SIZE
 348 #define THREAD_MANAGER_STACK_SIZE  (2 * PAGE_SIZE - 32)
 349 #endif
 350
 351 /* The base of the "array" of thread stacks.  The array will grow down from
 352    here.  Defaults to the calculated bottom of the initial application
 353    stack.  */
 354 #ifndef THREAD_STACK_START_ADDRESS
 355 #define THREAD_STACK_START_ADDRESS  __pthread_initial_thread_bos
 356 #endif
 357
 358 /* Get some notion of the current stack.  Need not be exactly the top
 359    of the stack, just something somewhere in the current frame.  */
 360 #ifndef CURRENT_STACK_FRAME
 361 #define CURRENT_STACK_FRAME  ({ char __csf; &__csf; })
 362 #endif
 363
 364 /* Recover thread descriptor for the current thread */
 365
 366 extern pthread_descr __pthread_find_self (void) __attribute__ ((const));
 367
 368 static inline pthread_descr thread_self (void) __attribute__ ((const));
 369 static inline pthread_descr thread_self (void)
 370 {
 371 #ifdef THREAD_SELF
 372   return THREAD_SELF;
 373 #else
 374   char *sp = CURRENT_STACK_FRAME;
 375   if (sp >= __pthread_initial_thread_bos)
 376     return &__pthread_initial_thread;
 377   else if (sp >= __pthread_manager_thread_bos
 378            && sp < __pthread_manager_thread_tos)
 379     return &__pthread_manager_thread;
 380   else if (__pthread_nonstandard_stacks)
 381     return __pthread_find_self();
 382   else
 383     return (pthread_descr)(((unsigned long)sp | (STACK_SIZE-1))+1) - 1;
 384 #endif
 385 }
 386
 387 /* If MEMORY_BARRIER isn't defined in pt-machine.h, assume the architecture
 388    doesn't need a memory barrier instruction (e.g. Intel x86).  Some
 389    architectures distinguish between full, read and write barriers.  */
 390
 391 #ifndef MEMORY_BARRIER
 392 #define MEMORY_BARRIER()
 393 #endif
 394 #ifndef READ_MEMORY_BARRIER
 395 #define READ_MEMORY_BARRIER() MEMORY_BARRIER()
 396 #endif
 397 #ifndef WRITE_MEMORY_BARRIER
 398 #define WRITE_MEMORY_BARRIER() MEMORY_BARRIER()
 399 #endif
 400
 401 /* Max number of times we must spin on a spinlock calling sched_yield().
 402    After MAX_SPIN_COUNT iterations, we put the calling thread to sleep. */
 403
 404 #ifndef MAX_SPIN_COUNT
 405 #define MAX_SPIN_COUNT 50
 406 #endif
 407
 408 /* Duration of sleep (in nanoseconds) when we can't acquire a spinlock
 409    after MAX_SPIN_COUNT iterations of sched_yield().
 410    With the 2.0 and 2.1 kernels, this MUST BE > 2ms.
 411    (Otherwise the kernel does busy-waiting for realtime threads,
 412     giving other threads no chance to run.) */
 413
 414 #ifndef SPIN_SLEEP_DURATION
 415 #define SPIN_SLEEP_DURATION 2000001
 416 #endif
 417
 418 /* Debugging */
 419
 420 #ifdef DEBUG
 421 #include <assert.h>
 422 #define ASSERT assert
 423 #define MSG __pthread_message
 424 #else
 425 #define ASSERT(x)
 426 #define MSG(msg,arg...)
 427 #endif
 428
 429 /* Internal global functions */
 430
 431 extern void __pthread_destroy_specifics (void);
 432 extern void __pthread_perform_cleanup (void);
 433 extern void __pthread_init_max_stacksize (void);
 434 extern int __pthread_initialize_manager (void);
 435 extern void __pthread_message (char * fmt, ...);
 436 extern int __pthread_manager (void *reqfd);
 437 extern int __pthread_manager_event (void *reqfd);
 438 extern void __pthread_manager_sighandler (int sig);
 439 extern void __pthread_reset_main_thread (void);
 440 extern void __pthread_once_fork_prepare (void);
 441 extern void __pthread_once_fork_parent (void);
 442 extern void __pthread_once_fork_child (void);
 443 extern void __flockfilelist (void);
 444 extern void __funlockfilelist (void);
 445 extern void __fresetlockfiles (void);
 446 extern void __pthread_manager_adjust_prio (int thread_prio);
 447 extern void __pthread_initialize_minimal (void);
 448
 449 extern int __pthread_attr_setguardsize (pthread_attr_t *__attr,
 450                                         size_t __guardsize);
 451 extern int __pthread_attr_getguardsize (const pthread_attr_t *__attr,
 452                                         size_t *__guardsize);
 453 extern int __pthread_attr_setstackaddr (pthread_attr_t *__attr,
 454                                         void *__stackaddr);
 455 extern int __pthread_attr_getstackaddr (const pthread_attr_t *__attr,
 456                                         void **__stackaddr);
 457 extern int __pthread_attr_setstacksize (pthread_attr_t *__attr,
 458                                         size_t __stacksize);
 459 extern int __pthread_attr_getstacksize (const pthread_attr_t *__attr,
 460                                         size_t *__stacksize);
 461 extern int __pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr,
 462                                     size_t __stacksize);
 463 extern int __pthread_attr_getstack (const pthread_attr_t *__attr, void **__stackaddr,
 464                                     size_t *__stacksize);
 465 extern int __pthread_getconcurrency (void);
 466 extern int __pthread_setconcurrency (int __level);
 467 extern int __pthread_mutex_timedlock (pthread_mutex_t *__mutex,
 468                                       const struct timespec *__abstime);
 469 extern int __pthread_mutexattr_getpshared (const pthread_mutexattr_t *__attr,
 470                                            int *__pshared);
 471 extern int __pthread_mutexattr_setpshared (pthread_mutexattr_t *__attr,
 472                                            int __pshared);
 473 extern int __pthread_mutexattr_gettype (const pthread_mutexattr_t *__attr,
 474                                         int *__kind);
 475 extern void __pthread_kill_other_threads_np (void);
 476
 477 extern void __pthread_restart_old(pthread_descr th);
 478 extern void __pthread_suspend_old(pthread_descr self);
 479 extern int __pthread_timedsuspend_old(pthread_descr self, const struct timespec *abs);
 480
 481 extern void __pthread_restart_new(pthread_descr th);
 482 extern void __pthread_suspend_new(pthread_descr self);
 483 extern int __pthread_timedsuspend_new(pthread_descr self, const struct timespec *abs);
 484
 485 extern void __pthread_wait_for_restart_signal(pthread_descr self);
 486
 487 extern int __pthread_yield (void);
 488
 489 extern int __pthread_rwlock_timedrdlock (pthread_rwlock_t *__restrict __rwlock,
 490                                          __const struct timespec *__restrict
 491                                          __abstime);
 492 extern int __pthread_rwlock_timedwrlock (pthread_rwlock_t *__restrict __rwlock,
 493                                          __const struct timespec *__restrict
 494                                          __abstime);
 495 extern int __pthread_rwlockattr_destroy (pthread_rwlockattr_t *__attr);
 496
 497 extern int __pthread_barrierattr_getpshared (__const pthread_barrierattr_t *
 498                                              __restrict __attr,
 499                                              int *__restrict __pshared);
 500
 501 extern int __pthread_spin_lock (pthread_spinlock_t *__lock);
 502 extern int __pthread_spin_trylock (pthread_spinlock_t *__lock);
 503 extern int __pthread_spin_unlock (pthread_spinlock_t *__lock);
 504 extern int __pthread_spin_init (pthread_spinlock_t *__lock, int __pshared);
 505 extern int __pthread_spin_destroy (pthread_spinlock_t *__lock);
 506
 507
 508 /* Global pointers to old or new suspend functions */
 509
 510 extern void (*__pthread_restart)(pthread_descr);
 511 extern void (*__pthread_suspend)(pthread_descr);
 512 extern int (*__pthread_timedsuspend)(pthread_descr, const struct timespec *);
 513
 514 /* Prototypes for the function without cancelation support when the
 515    normal version has it.  */
 516 extern int __libc_close (int fd);
 517 extern int __libc_nanosleep (const struct timespec *requested_time,
 518                              struct timespec *remaining);
 519 /* Prototypes for some of the new semaphore functions.  */
 520 extern int __new_sem_post (sem_t * sem);
 521 extern int __new_sem_init (sem_t *__sem, int __pshared, unsigned int __value);
 522 extern int __new_sem_wait (sem_t *__sem);
 523 extern int __new_sem_trywait (sem_t *__sem);
 524 extern int __new_sem_getvalue (sem_t *__restrict __sem, int *__restrict __sval);
 525 extern int __new_sem_destroy (sem_t *__sem);
 526
 527 /* Prototypes for compatibility functions.  */
 528 extern int __pthread_attr_init_2_1 (pthread_attr_t *__attr);
 529 extern int __pthread_attr_init_2_0 (pthread_attr_t *__attr);
 530 extern int __pthread_create_2_1 (pthread_t *__restrict __thread,
 531                                  const pthread_attr_t *__attr,
 532                                  void *(*__start_routine) (void *),
 533                                  void *__restrict __arg);
 534 extern int __pthread_create_2_0 (pthread_t *__restrict thread,
 535                                  const pthread_attr_t *__attr,
 536                                  void *(*__start_routine) (void *),
 537                                  void *__restrict arg);
 538
 539 /* The functions called the signal events.  */
 540 extern void __linuxthreads_create_event (void);
 541 extern void __linuxthreads_death_event (void);
 542 extern void __linuxthreads_reap_event (void);
 543
 544 /* This function is called to initialize the pthread library.  */
 545 extern void __pthread_initialize (void);
 546
 547 #endif /* internals.h */