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 <signal.h>
  24 #include <unistd.h>
  25 #include <stackinfo.h>
  26 #include <sigcontextinfo.h>
  27
  28 #include <tls.h>
  29 #include "descr.h"
  30
  31 #include "semaphore.h"
  32
  33 #ifndef THREAD_GETMEM
  34 # define THREAD_GETMEM(descr, member) descr->member
  35 #endif
  36 #ifndef THREAD_GETMEM_NC
  37 # define THREAD_GETMEM_NC(descr, member) descr->member
  38 #endif
  39 #ifndef THREAD_SETMEM
  40 # define THREAD_SETMEM(descr, member, value) descr->member = (value)
  41 #endif
  42 #ifndef THREAD_SETMEM_NC
  43 # define THREAD_SETMEM_NC(descr, member, value) descr->member = (value)
  44 #endif
  45
  46 #if !defined NOT_IN_libc && defined FLOATING_STACKS
  47 # define LIBC_THREAD_GETMEM(descr, member) THREAD_GETMEM (descr, member)
  48 # define LIBC_THREAD_SETMEM(descr, member, value) \
  49   THREAD_SETMEM (descr, member, value)
  50 #else
  51 # define LIBC_THREAD_GETMEM(descr, member) descr->member
  52 # define LIBC_THREAD_SETMEM(descr, member, value) descr->member = (value)
  53 #endif
  54
  55 typedef void (*destr_function)(void *);
  56
  57 struct pthread_key_struct {
  58   int in_use;                   /* already allocated? */
  59   destr_function destr;         /* destruction routine */
  60 };
  61
  62
  63 #define PTHREAD_START_ARGS_INITIALIZER(fct) \
  64   { (void *(*) (void *)) fct, NULL, {{0, }}, 0, { 0 } }
  65
  66
  67 /* The type of thread handles. */
  68
  69 typedef struct pthread_handle_struct * pthread_handle;
  70
  71 struct pthread_handle_struct {
  72   struct _pthread_fastlock h_lock; /* Fast lock for sychronized access */
  73   pthread_descr h_descr;        /* Thread descriptor or NULL if invalid */
  74   char * h_bottom;              /* Lowest address in the stack thread */
  75 };
  76
  77 /* The type of messages sent to the thread manager thread */
  78
  79 struct pthread_request {
  80   pthread_descr req_thread;     /* Thread doing the request */
  81   enum {                        /* Request kind */
  82     REQ_CREATE, REQ_FREE, REQ_PROCESS_EXIT, REQ_MAIN_THREAD_EXIT,
  83     REQ_POST, REQ_DEBUG, REQ_KICK, REQ_FOR_EACH_THREAD
  84   } req_kind;
  85   union {                       /* Arguments for request */
  86     struct {                    /* For REQ_CREATE: */
  87       const pthread_attr_t * attr; /* thread attributes */
  88       void * (*fn)(void *);     /*   start function */
  89       void * arg;               /*   argument to start function */
  90       sigset_t mask;            /*   signal mask */
  91     } create;
  92     struct {                    /* For REQ_FREE: */
  93       pthread_t thread_id;      /*   identifier of thread to free */
  94     } free;
  95     struct {                    /* For REQ_PROCESS_EXIT: */
  96       int code;                 /*   exit status */
  97     } exit;
  98     void * post;                /* For REQ_POST: the semaphore */
  99     struct {                    /* For REQ_FOR_EACH_THREAD: callback */
 100       void (*fn)(void *, pthread_descr);
 101       void *arg;
 102     } for_each;
 103   } req_args;
 104 };
 105
 106
 107
 108 typedef void (*arch_sighandler_t) (int, SIGCONTEXT);
 109 union sighandler
 110 {
 111   arch_sighandler_t old;
 112   void (*rt) (int, struct siginfo *, struct ucontext *);
 113 };
 114 extern union sighandler __sighandler[NSIG];
 115
 116
 117 /* Signals used for suspend/restart and for cancellation notification.  */
 118
 119 extern int __pthread_sig_restart;
 120 extern int __pthread_sig_cancel;
 121
 122 /* Signal used for interfacing with gdb */
 123
 124 extern int __pthread_sig_debug;
 125
 126 /* Global array of thread handles, used for validating a thread id
 127    and retrieving the corresponding thread descriptor. Also used for
 128    mapping the available stack segments. */
 129
 130 extern struct pthread_handle_struct __pthread_handles[PTHREAD_THREADS_MAX];
 131
 132 /* Descriptor of the main thread */
 133
 134 extern pthread_descr __pthread_main_thread;
 135
 136 /* File descriptor for sending requests to the thread manager.
 137    Initially -1, meaning that __pthread_initialize_manager must be called. */
 138
 139 extern int __pthread_manager_request;
 140
 141 /* Other end of the pipe for sending requests to the thread manager. */
 142
 143 extern int __pthread_manager_reader;
 144
 145 #ifdef FLOATING_STACKS
 146 /* Maximum stack size.  */
 147 extern size_t __pthread_max_stacksize;
 148 #endif
 149
 150 /* Pending request for a process-wide exit */
 151
 152 extern int __pthread_exit_requested, __pthread_exit_code;
 153
 154 /* Set to 1 by gdb if we're debugging */
 155
 156 extern volatile int __pthread_threads_debug;
 157
 158 /* Globally enabled events.  */
 159 extern volatile td_thr_events_t __pthread_threads_events;
 160
 161 /* Pointer to descriptor of thread with last event.  */
 162 extern volatile pthread_descr __pthread_last_event;
 163
 164 /* Flag which tells whether we are executing on SMP kernel. */
 165 extern int __pthread_smp_kernel;
 166
 167 /* Return the handle corresponding to a thread id */
 168
 169 static inline pthread_handle thread_handle(pthread_t id)
 170 {
 171   return &__pthread_handles[id % PTHREAD_THREADS_MAX];
 172 }
 173
 174 /* Validate a thread handle. Must have acquired h->h_spinlock before. */
 175
 176 static inline int invalid_handle(pthread_handle h, pthread_t id)
 177 {
 178   return h->h_descr == NULL || h->h_descr->p_tid != id || h->h_descr->p_terminated;
 179 }
 180
 181 static inline int nonexisting_handle(pthread_handle h, pthread_t id)
 182 {
 183   return h->h_descr == NULL || h->h_descr->p_tid != id;
 184 }
 185
 186 /* Fill in defaults left unspecified by pt-machine.h.  */
 187
 188 /* We round up a value with page size. */
 189 #ifndef page_roundup
 190 #define page_roundup(v,p) ((((size_t) (v)) + (p) - 1) & ~((p) - 1))
 191 #endif
 192
 193 /* The page size we can get from the system.  This should likely not be
 194    changed by the machine file but, you never know.  */
 195 #ifndef PAGE_SIZE
 196 #define PAGE_SIZE  (sysconf (_SC_PAGE_SIZE))
 197 #endif
 198
 199 /* The initial size of the thread stack.  Must be a multiple of PAGE_SIZE.  */
 200 #ifndef INITIAL_STACK_SIZE
 201 #define INITIAL_STACK_SIZE  (4 * PAGE_SIZE)
 202 #endif
 203
 204 /* Size of the thread manager stack. The "- 32" avoids wasting space
 205    with some malloc() implementations. */
 206 #ifndef THREAD_MANAGER_STACK_SIZE
 207 #define THREAD_MANAGER_STACK_SIZE  (2 * PAGE_SIZE - 32)
 208 #endif
 209
 210 /* The base of the "array" of thread stacks.  The array will grow down from
 211    here.  Defaults to the calculated bottom of the initial application
 212    stack.  */
 213 #ifndef THREAD_STACK_START_ADDRESS
 214 #define THREAD_STACK_START_ADDRESS  __pthread_initial_thread_bos
 215 #endif
 216
 217 /* If MEMORY_BARRIER isn't defined in pt-machine.h, assume the
 218    architecture doesn't need a memory barrier instruction (e.g. Intel
 219    x86).  Still we need the compiler to respect the barrier and emit
 220    all outstanding operations which modify memory.  Some architectures
 221    distinguish between full, read and write barriers.  */
 222
 223 #ifndef MEMORY_BARRIER
 224 #define MEMORY_BARRIER() asm ("" : : : "memory")
 225 #endif
 226 #ifndef READ_MEMORY_BARRIER
 227 #define READ_MEMORY_BARRIER() MEMORY_BARRIER()
 228 #endif
 229 #ifndef WRITE_MEMORY_BARRIER
 230 #define WRITE_MEMORY_BARRIER() MEMORY_BARRIER()
 231 #endif
 232
 233 /* Max number of times we must spin on a spinlock calling sched_yield().
 234    After MAX_SPIN_COUNT iterations, we put the calling thread to sleep. */
 235
 236 #ifndef MAX_SPIN_COUNT
 237 #define MAX_SPIN_COUNT 50
 238 #endif
 239
 240 /* Max number of times the spinlock in the adaptive mutex implementation
 241    spins actively on SMP systems.  */
 242
 243 #ifndef MAX_ADAPTIVE_SPIN_COUNT
 244 #define MAX_ADAPTIVE_SPIN_COUNT 100
 245 #endif
 246
 247 /* Duration of sleep (in nanoseconds) when we can't acquire a spinlock
 248    after MAX_SPIN_COUNT iterations of sched_yield().
 249    With the 2.0 and 2.1 kernels, this MUST BE > 2ms.
 250    (Otherwise the kernel does busy-waiting for realtime threads,
 251     giving other threads no chance to run.) */
 252
 253 #ifndef SPIN_SLEEP_DURATION
 254 #define SPIN_SLEEP_DURATION 2000001
 255 #endif
 256
 257 /* Defined and used in libc.so.  */
 258 extern int __libc_multiple_threads attribute_hidden;
 259
 260 /* Debugging */
 261
 262 #ifdef DEBUG
 263 #include <assert.h>
 264 #define ASSERT assert
 265 #define MSG __pthread_message
 266 #else
 267 #define ASSERT(x)
 268 #define MSG(msg,arg...)
 269 #endif
 270
 271 /* Internal global functions */
 272
 273 extern void __pthread_do_exit (void *retval, char *currentframe)
 274      __attribute__ ((__noreturn__));
 275 extern void __pthread_destroy_specifics (void);
 276 extern void __pthread_perform_cleanup (char *currentframe);
 277 extern void __pthread_init_max_stacksize (void);
 278 extern int __pthread_initialize_manager (void);
 279 extern void __pthread_message (const char * fmt, ...);
 280 extern int __pthread_manager (void *reqfd);
 281 extern int __pthread_manager_event (void *reqfd);
 282 extern void __pthread_manager_sighandler (int sig);
 283 extern void __pthread_reset_main_thread (void);
 284 extern void __pthread_once_fork_prepare (void);
 285 extern void __pthread_once_fork_parent (void);
 286 extern void __pthread_once_fork_child (void);
 287 extern void __flockfilelist (void);
 288 extern void __funlockfilelist (void);
 289 extern void __fresetlockfiles (void);
 290 extern void __pthread_manager_adjust_prio (int thread_prio);
 291 extern void __pthread_initialize_minimal (void);
 292
 293 extern int __pthread_attr_setguardsize (pthread_attr_t *__attr,
 294                                         size_t __guardsize);
 295 extern int __pthread_attr_getguardsize (const pthread_attr_t *__attr,
 296                                         size_t *__guardsize);
 297 extern int __pthread_attr_setstackaddr (pthread_attr_t *__attr,
 298                                         void *__stackaddr);
 299 extern int __pthread_attr_getstackaddr (const pthread_attr_t *__attr,
 300                                         void **__stackaddr);
 301 extern int __pthread_attr_setstacksize (pthread_attr_t *__attr,
 302                                         size_t __stacksize);
 303 extern int __pthread_attr_getstacksize (const pthread_attr_t *__attr,
 304                                         size_t *__stacksize);
 305 extern int __pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr,
 306                                     size_t __stacksize);
 307 extern int __pthread_attr_getstack (const pthread_attr_t *__attr, void **__stackaddr,
 308                                     size_t *__stacksize);
 309 extern int __pthread_attr_destroy (pthread_attr_t *attr);
 310 extern int __pthread_attr_setdetachstate (pthread_attr_t *attr,
 311                                           int detachstate);
 312 extern int __pthread_attr_getdetachstate (const pthread_attr_t *attr,
 313                                           int *detachstate);
 314 extern int __pthread_attr_setschedparam (pthread_attr_t *attr,
 315                                          const struct sched_param *param);
 316 extern int __pthread_attr_getschedparam (const pthread_attr_t *attr,
 317                                          struct sched_param *param);
 318 extern int __pthread_attr_setschedpolicy (pthread_attr_t *attr, int policy);
 319 extern int __pthread_attr_getschedpolicy (const pthread_attr_t *attr,
 320                                           int *policy);
 321 extern int __pthread_attr_setinheritsched (pthread_attr_t *attr, int inherit);
 322 extern int __pthread_attr_getinheritsched (const pthread_attr_t *attr,
 323                                            int *inherit);
 324 extern int __pthread_attr_setscope (pthread_attr_t *attr, int scope);
 325 extern int __pthread_attr_getscope (const pthread_attr_t *attr, int *scope);
 326
 327 extern int __pthread_getconcurrency (void);
 328 extern int __pthread_setconcurrency (int __level);
 329 extern int __pthread_mutex_timedlock (pthread_mutex_t *__mutex,
 330                                       const struct timespec *__abstime);
 331 extern int __pthread_mutexattr_getpshared (const pthread_mutexattr_t *__attr,
 332                                            int *__pshared);
 333 extern int __pthread_mutexattr_setpshared (pthread_mutexattr_t *__attr,
 334                                            int __pshared);
 335 extern int __pthread_mutexattr_gettype (const pthread_mutexattr_t *__attr,
 336                                         int *__kind);
 337 extern void __pthread_kill_other_threads_np (void);
 338 extern int __pthread_mutex_init (pthread_mutex_t *__mutex,
 339                                  __const pthread_mutexattr_t *__mutex_attr);
 340 extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex);
 341 extern int __pthread_mutex_lock (pthread_mutex_t *__mutex);
 342 extern int __pthread_mutex_trylock (pthread_mutex_t *__mutex);
 343 extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex);
 344 #if defined NOT_IN_libc && defined IS_IN_libpthread
 345 hidden_proto (__pthread_mutex_init)
 346 hidden_proto (__pthread_mutex_destroy)
 347 hidden_proto (__pthread_mutex_lock)
 348 hidden_proto (__pthread_mutex_trylock)
 349 hidden_proto (__pthread_mutex_unlock)
 350 #endif
 351 extern int __pthread_cond_init (pthread_cond_t *cond,
 352                                 const pthread_condattr_t *cond_attr);
 353 extern int __pthread_cond_destroy (pthread_cond_t *cond);
 354 extern int __pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex);
 355 extern int __pthread_cond_signal (pthread_cond_t *cond);
 356 extern int __pthread_cond_broadcast (pthread_cond_t *cond);
 357 extern int __pthread_condattr_init (pthread_condattr_t *attr);
 358 extern int __pthread_condattr_destroy (pthread_condattr_t *attr);
 359 extern pthread_t __pthread_self (void);
 360 extern pthread_descr __pthread_thread_self (void);
 361 extern int __pthread_equal (pthread_t thread1, pthread_t thread2);
 362 extern void __pthread_exit (void *retval);
 363 extern int __pthread_getschedparam (pthread_t thread, int *policy,
 364                                     struct sched_param *param);
 365 extern int __pthread_setschedparam (pthread_t thread, int policy,
 366                                     const struct sched_param *param);
 367 extern int __pthread_setcancelstate (int state, int * oldstate);
 368 extern int __pthread_setcanceltype (int type, int * oldtype);
 369
 370 extern void __pthread_restart_old(pthread_descr th);
 371 extern void __pthread_suspend_old(pthread_descr self);
 372 extern int __pthread_timedsuspend_old(pthread_descr self, const struct timespec *abs);
 373
 374 extern void __pthread_restart_new(pthread_descr th);
 375 extern void __pthread_suspend_new(pthread_descr self);
 376 extern int __pthread_timedsuspend_new(pthread_descr self, const struct timespec *abs);
 377
 378 extern void __pthread_wait_for_restart_signal(pthread_descr self);
 379
 380 extern int __pthread_yield (void);
 381
 382 extern int __pthread_rwlock_timedrdlock (pthread_rwlock_t *__restrict __rwlock,
 383                                          __const struct timespec *__restrict
 384                                          __abstime);
 385 extern int __pthread_rwlock_timedwrlock (pthread_rwlock_t *__restrict __rwlock,
 386                                          __const struct timespec *__restrict
 387                                          __abstime);
 388 extern int __pthread_rwlockattr_destroy (pthread_rwlockattr_t *__attr);
 389
 390 extern int __pthread_barrierattr_getpshared (__const pthread_barrierattr_t *
 391                                              __restrict __attr,
 392                                              int *__restrict __pshared);
 393
 394 extern int __pthread_spin_lock (pthread_spinlock_t *__lock);
 395 extern int __pthread_spin_trylock (pthread_spinlock_t *__lock);
 396 extern int __pthread_spin_unlock (pthread_spinlock_t *__lock);
 397 extern int __pthread_spin_init (pthread_spinlock_t *__lock, int __pshared);
 398 extern int __pthread_spin_destroy (pthread_spinlock_t *__lock);
 399
 400 extern int __pthread_clock_gettime (hp_timing_t freq, struct timespec *tp);
 401 extern void __pthread_clock_settime (hp_timing_t offset);
 402
 403 /* Global pointers to old or new suspend functions */
 404
 405 extern void (*__pthread_restart)(pthread_descr);
 406 extern void (*__pthread_suspend)(pthread_descr);
 407 extern int (*__pthread_timedsuspend)(pthread_descr, const struct timespec *);
 408
 409 /* Prototypes for the function without cancelation support when the
 410    normal version has it.  */
 411 extern int __libc_close (int fd);
 412 extern int __libc_nanosleep (const struct timespec *requested_time,
 413                              struct timespec *remaining);
 414 /* Prototypes for some of the new semaphore functions.  */
 415 extern int __new_sem_post (sem_t * sem);
 416 extern int __new_sem_init (sem_t *__sem, int __pshared, unsigned int __value);
 417 extern int __new_sem_wait (sem_t *__sem);
 418 extern int __new_sem_trywait (sem_t *__sem);
 419 extern int __new_sem_getvalue (sem_t *__restrict __sem, int *__restrict __sval);
 420 extern int __new_sem_destroy (sem_t *__sem);
 421
 422 /* Prototypes for compatibility functions.  */
 423 extern int __pthread_attr_init_2_1 (pthread_attr_t *__attr);
 424 extern int __pthread_attr_init_2_0 (pthread_attr_t *__attr);
 425 extern int __pthread_create_2_1 (pthread_t *__restrict __threadp,
 426                                  const pthread_attr_t *__attr,
 427                                  void *(*__start_routine) (void *),
 428                                  void *__restrict __arg);
 429 extern int __pthread_create_2_0 (pthread_t *__restrict thread,
 430                                  const pthread_attr_t *__attr,
 431                                  void *(*__start_routine) (void *),
 432                                  void *__restrict arg);
 433
 434 /* The functions called the signal events.  */
 435 extern void __linuxthreads_create_event (void);
 436 extern void __linuxthreads_death_event (void);
 437 extern void __linuxthreads_reap_event (void);
 438
 439 /* This function is called to initialize the pthread library.  */
 440 extern void __pthread_initialize (void);
 441
 442 /* TSD.  */
 443 extern int __pthread_internal_tsd_set (int key, const void * pointer);
 444 extern void * __pthread_internal_tsd_get (int key);
 445 extern void ** __attribute__ ((__const__))
 446   __pthread_internal_tsd_address (int key);
 447
 448 /* Sighandler wrappers.  */
 449 extern void __pthread_sighandler(int signo, SIGCONTEXT ctx);
 450 extern void __pthread_sighandler_rt(int signo, struct siginfo *si,
 451                                     struct ucontext *uc);
 452 extern void __pthread_null_sighandler(int sig);
 453 extern int __pthread_sigaction (int sig, const struct sigaction *act,
 454                                 struct sigaction *oact);
 455 extern int __pthread_sigwait (const sigset_t *set, int *sig);
 456 extern int __pthread_raise (int sig);
 457
 458 /* Cancellation.  */
 459 extern int __pthread_enable_asynccancel (void) attribute_hidden;
 460 extern void __pthread_disable_asynccancel (int oldtype)
 461   internal_function attribute_hidden;
 462
 463 /* The two functions are in libc.so and not exported.  */
 464 extern int __libc_enable_asynccancel (void) attribute_hidden;
 465 extern void __libc_disable_asynccancel (int oldtype)
 466   internal_function attribute_hidden;
 467
 468 extern void __pthread_cleanup_upto (__jmp_buf target,
 469                                     char *targetframe) attribute_hidden;
 470 struct fork_block;
 471 extern pid_t __pthread_fork (struct fork_block *b) attribute_hidden;
 472
 473 #if !defined NOT_IN_libc
 474 # define LIBC_CANCEL_ASYNC() \
 475   __libc_enable_asynccancel ()
 476 # define LIBC_CANCEL_RESET(oldtype) \
 477   __libc_disable_asynccancel (oldtype)
 478 # define LIBC_CANCEL_HANDLED() \
 479   __asm (".globl " __SYMBOL_PREFIX "__libc_enable_asynccancel"); \
 480   __asm (".globl " __SYMBOL_PREFIX "__libc_disable_asynccancel")
 481 #elif defined NOT_IN_libc && defined IS_IN_libpthread
 482 # define LIBC_CANCEL_ASYNC() \
 483   __pthread_enable_asynccancel ()
 484 # define LIBC_CANCEL_RESET(oldtype) \
 485   __pthread_disable_asynccancel (oldtype)
 486 # define LIBC_CANCEL_HANDLED() \
 487   __asm (".globl " __SYMBOL_PREFIX "__pthread_enable_asynccancel"); \
 488   __asm (".globl " __SYMBOL_PREFIX "__pthread_disable_asynccancel")
 489 #else
 490 # define LIBC_CANCEL_ASYNC()    0 /* Just a dummy value.  */
 491 # define LIBC_CANCEL_RESET(val) ((void)(val)) /* Nothing, but evaluate it.  */
 492 # define LIBC_CANCEL_HANDLED()  /* Nothing.  */
 493 #endif
 494
 495 /* Data type shared with libc.  The libc uses it to pass on calls to
 496    the thread functions.  */
 497 struct pthread_functions
 498 {
 499   pid_t (*ptr_pthread_fork) (struct fork_block *);
 500   int (*ptr_pthread_attr_destroy) (pthread_attr_t *);
 501   int (*ptr___pthread_attr_init_2_0) (pthread_attr_t *);
 502   int (*ptr___pthread_attr_init_2_1) (pthread_attr_t *);
 503   int (*ptr_pthread_attr_getdetachstate) (const pthread_attr_t *, int *);
 504   int (*ptr_pthread_attr_setdetachstate) (pthread_attr_t *, int);
 505   int (*ptr_pthread_attr_getinheritsched) (const pthread_attr_t *, int *);
 506   int (*ptr_pthread_attr_setinheritsched) (pthread_attr_t *, int);
 507   int (*ptr_pthread_attr_getschedparam) (const pthread_attr_t *,
 508                                          struct sched_param *);
 509   int (*ptr_pthread_attr_setschedparam) (pthread_attr_t *,
 510                                          const struct sched_param *);
 511   int (*ptr_pthread_attr_getschedpolicy) (const pthread_attr_t *, int *);
 512   int (*ptr_pthread_attr_setschedpolicy) (pthread_attr_t *, int);
 513   int (*ptr_pthread_attr_getscope) (const pthread_attr_t *, int *);
 514   int (*ptr_pthread_attr_setscope) (pthread_attr_t *, int);
 515   int (*ptr_pthread_condattr_destroy) (pthread_condattr_t *);
 516   int (*ptr_pthread_condattr_init) (pthread_condattr_t *);
 517   int (*ptr___pthread_cond_broadcast) (pthread_cond_t *);
 518   int (*ptr___pthread_cond_destroy) (pthread_cond_t *);
 519   int (*ptr___pthread_cond_init) (pthread_cond_t *,
 520                                   const pthread_condattr_t *);
 521   int (*ptr___pthread_cond_signal) (pthread_cond_t *);
 522   int (*ptr___pthread_cond_wait) (pthread_cond_t *, pthread_mutex_t *);
 523   int (*ptr_pthread_equal) (pthread_t, pthread_t);
 524   void (*ptr___pthread_exit) (void *);
 525   int (*ptr_pthread_getschedparam) (pthread_t, int *, struct sched_param *);
 526   int (*ptr_pthread_setschedparam) (pthread_t, int,
 527                                     const struct sched_param *);
 528   int (*ptr_pthread_mutex_destroy) (pthread_mutex_t *);
 529   int (*ptr_pthread_mutex_init) (pthread_mutex_t *,
 530                                  const pthread_mutexattr_t *);
 531   int (*ptr_pthread_mutex_lock) (pthread_mutex_t *);
 532   int (*ptr_pthread_mutex_trylock) (pthread_mutex_t *);
 533   int (*ptr_pthread_mutex_unlock) (pthread_mutex_t *);
 534   pthread_t (*ptr_pthread_self) (void);
 535   int (*ptr_pthread_setcancelstate) (int, int *);
 536   int (*ptr_pthread_setcanceltype) (int, int *);
 537   void (*ptr_pthread_do_exit) (void *retval, char *currentframe);
 538   void (*ptr_pthread_cleanup_upto) (__jmp_buf target,
 539                                     char *targetframe);
 540   pthread_descr (*ptr_pthread_thread_self) (void);
 541   int (*ptr_pthread_internal_tsd_set) (int key, const void *pointer);
 542   void * (*ptr_pthread_internal_tsd_get) (int key);
 543   void ** __attribute__ ((__const__))
 544     (*ptr_pthread_internal_tsd_address) (int key);
 545   int (*ptr_pthread_sigaction) (int sig, const struct sigaction * act,
 546                                 struct sigaction *oact);
 547   int (*ptr_pthread_sigwait) (const sigset_t *set, int *sig);
 548   int (*ptr_pthread_raise) (int sig);
 549 };
 550
 551 /* Variable in libc.so.  */
 552 extern struct pthread_functions __libc_pthread_functions attribute_hidden;
 553 extern int * __libc_pthread_init (const struct pthread_functions *functions);
 554
 555 #if !defined NOT_IN_libc && !defined FLOATING_STACKS
 556 # ifdef SHARED
 557 #  define thread_self() \
 558   (*__libc_pthread_functions.ptr_pthread_thread_self) ()
 559 # else
 560 weak_extern (__pthread_thread_self)
 561 #  define thread_self() __pthread_thread_self ()
 562 # endif
 563 #endif
 564
 565 #endif /* internals.h */