thread.h

   1 /*    thread.h
   2  *
   3  *    Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
   4  *    by Larry Wall and others
   5  *
   6  *    You may distribute under the terms of either the GNU General Public
   7  *    License or the Artistic License, as specified in the README file.
   8  *
   9  */
  10
  11 #if defined(USE_ITHREADS)
  12
  13 #if defined(VMS)
  14 #include <builtins.h>
  15 #endif
  16
  17 #ifdef WIN32
  18 #  include <win32thread.h>
  19 #else
  20 #  ifdef OLD_PTHREADS_API /* Here be dragons. */
  21 #    define DETACH(t) \
  22     STMT_START {                                                \
  23         int _eC_;                                               \
  24         if ((_eC_ = pthread_detach(&(t)->self))) {              \
  25             MUTEX_UNLOCK(&(t)->mutex);                          \
  26             Perl_croak_nocontext("panic: DETACH (%d) [%s:%d]",  \
  27                                  _eC_, __FILE__, __LINE__);     \
  28         }                                                       \
  29     } STMT_END
  30
  31 #    define PERL_GET_CONTEXT    Perl_get_context()
  32 #    define PERL_SET_CONTEXT(t) Perl_set_context((void*)t)
  33
  34 #    define PTHREAD_GETSPECIFIC_INT
  35 #    ifdef OEMVS
  36 #      define pthread_addr_t void *
  37 #      define pthread_create(t,a,s,d)        pthread_create(t,&(a),s,d)
  38 #      define pthread_keycreate              pthread_key_create
  39 #    endif
  40 #    ifdef VMS
  41 #      define pthread_attr_init(a) pthread_attr_create(a)
  42 #      define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_setdetach_np(a,s)
  43 #      define PTHREAD_CREATE(t,a,s,d) pthread_create(t,a,s,d)
  44 #      define pthread_key_create(k,d) pthread_keycreate(k,(pthread_destructor_t)(d))
  45 #      define pthread_mutexattr_init(a) pthread_mutexattr_create(a)
  46 #      define pthread_mutexattr_settype(a,t) pthread_mutexattr_setkind_np(a,t)
  47 #    endif
  48 #    if defined(__hpux) && defined(__ux_version) && __ux_version <= 1020
  49 #      define pthread_attr_init(a) pthread_attr_create(a)
  50        /* XXX pthread_setdetach_np() missing in DCE threads on HP-UX 10.20 */
  51 #      define PTHREAD_ATTR_SETDETACHSTATE(a,s)  (0)
  52 #      define PTHREAD_CREATE(t,a,s,d) pthread_create(t,a,s,d)
  53 #      define pthread_key_create(k,d) pthread_keycreate(k,(pthread_destructor_t)(d))
  54 #      define pthread_mutexattr_init(a) pthread_mutexattr_create(a)
  55 #      define pthread_mutexattr_settype(a,t) pthread_mutexattr_setkind_np(a,t)
  56 #    endif
  57 #    if defined(OEMVS)
  58 #      define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,&(s))
  59 #      define YIELD pthread_yield(NULL)
  60 #    endif
  61 #  endif
  62 #  if !defined(__hpux) || !defined(__ux_version) || __ux_version > 1020
  63 #    define pthread_mutexattr_default NULL
  64 #    define pthread_condattr_default  NULL
  65 #  endif
  66 #endif
  67
  68 #ifndef PTHREAD_CREATE
  69 /* You are not supposed to pass NULL as the 2nd arg of PTHREAD_CREATE(). */
  70 #  define PTHREAD_CREATE(t,a,s,d) pthread_create(t,&(a),s,d)
  71 #endif
  72
  73 #ifndef PTHREAD_ATTR_SETDETACHSTATE
  74 #  define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,s)
  75 #endif
  76
  77 #ifndef PTHREAD_CREATE_JOINABLE
  78 #  ifdef OLD_PTHREAD_CREATE_JOINABLE
  79 #    define PTHREAD_CREATE_JOINABLE OLD_PTHREAD_CREATE_JOINABLE
  80 #  else
  81 #    define PTHREAD_CREATE_JOINABLE 0 /* Panic?  No, guess. */
  82 #  endif
  83 #endif
  84
  85 #ifdef __VMS
  86   /* Default is 1024 on VAX, 8192 otherwise */
  87 #  ifdef __ia64
  88 #    define THREAD_CREATE_NEEDS_STACK (48*1024)
  89 #  else
  90 #    define THREAD_CREATE_NEEDS_STACK (32*1024)
  91 #  endif
  92 #endif
  93
  94 #ifdef I_MACH_CTHREADS
  95
  96 /* cthreads interface */
  97
  98 /* #include <mach/cthreads.h> is in perl.h #ifdef I_MACH_CTHREADS */
  99
 100 #define MUTEX_INIT(m) \
 101     STMT_START {                                                \
 102         *m = mutex_alloc();                                     \
 103         if (*m) {                                               \
 104             mutex_init(*m);                                     \
 105         } else {                                                \
 106             Perl_croak_nocontext("panic: MUTEX_INIT [%s:%d]",   \
 107                                  __FILE__, __LINE__);           \
 108         }                                                       \
 109     } STMT_END
 110
 111 #define MUTEX_LOCK(m)                   mutex_lock(*m)
 112 #define MUTEX_UNLOCK(m)                 mutex_unlock(*m)
 113 #define MUTEX_DESTROY(m) \
 114     STMT_START {                                                \
 115         mutex_free(*m);                                         \
 116         *m = 0;                                                 \
 117     } STMT_END
 118
 119 #define COND_INIT(c) \
 120     STMT_START {                                                \
 121         *c = condition_alloc();                                 \
 122         if (*c) {                                               \
 123             condition_init(*c);                                 \
 124         }                                                       \
 125         else {                                                  \
 126             Perl_croak_nocontext("panic: COND_INIT [%s:%d]",    \
 127                                  __FILE__, __LINE__);           \
 128         }                                                       \
 129     } STMT_END
 130
 131 #define COND_SIGNAL(c)          condition_signal(*c)
 132 #define COND_BROADCAST(c)       condition_broadcast(*c)
 133 #define COND_WAIT(c, m)         condition_wait(*c, *m)
 134 #define COND_DESTROY(c) \
 135     STMT_START {                                                \
 136         condition_free(*c);                                     \
 137         *c = 0;                                                 \
 138     } STMT_END
 139
 140 #define THREAD_RET_TYPE         any_t
 141
 142 #define DETACH(t)               cthread_detach(t->self)
 143 #define JOIN(t, avp)            (*(avp) = MUTABLE_AV(cthread_join(t->self)))
 144
 145 #define PERL_SET_CONTEXT(t)     cthread_set_data(cthread_self(), t)
 146 #define PERL_GET_CONTEXT        cthread_data(cthread_self())
 147
 148 #define INIT_THREADS            cthread_init()
 149 #define YIELD                   cthread_yield()
 150 #define ALLOC_THREAD_KEY        NOOP
 151 #define FREE_THREAD_KEY         NOOP
 152 #define SET_THREAD_SELF(thr)    (thr->self = cthread_self())
 153
 154 #endif /* I_MACH_CTHREADS */
 155
 156 #ifndef YIELD
 157 #  ifdef SCHED_YIELD
 158 #    define YIELD SCHED_YIELD
 159 #  elif defined(HAS_SCHED_YIELD)
 160 #    define YIELD sched_yield()
 161 #  elif defined(HAS_PTHREAD_YIELD)
 162     /* pthread_yield(NULL) platforms are expected
 163      * to have #defined YIELD for themselves. */
 164 #    define YIELD pthread_yield()
 165 #  endif
 166 #endif
 167
 168 #ifdef __hpux
 169 #  define MUTEX_INIT_NEEDS_MUTEX_ZEROED
 170 #endif
 171
 172 #ifndef MUTEX_INIT
 173
 174 #  ifdef MUTEX_INIT_NEEDS_MUTEX_ZEROED
 175     /* Temporary workaround, true bug is deeper. --jhi 1999-02-25 */
 176 #    define MUTEX_INIT(m) \
 177     STMT_START {                                                    \
 178         int _eC_;                                                   \
 179         Zero((m), 1, perl_mutex);                                   \
 180         if ((_eC_ = pthread_mutex_init((m), pthread_mutexattr_default)))\
 181             Perl_croak_nocontext("panic: MUTEX_INIT (%d) [%s:%d]",  \
 182                                  _eC_, __FILE__, __LINE__);         \
 183     } STMT_END
 184 #  else
 185 #    define MUTEX_INIT(m) \
 186     STMT_START {                                                \
 187         int _eC_;                                               \
 188         if ((_eC_ = pthread_mutex_init((m), pthread_mutexattr_default))) \
 189             Perl_croak_nocontext("panic: MUTEX_INIT (%d) [%s:%d]", \
 190                                  _eC_, __FILE__, __LINE__);     \
 191     } STMT_END
 192 #  endif
 193
 194 #  ifdef PERL_TSA_ACTIVE
 195 #    define perl_pthread_mutex_lock(m) perl_tsa_mutex_lock(m)
 196 #    define perl_pthread_mutex_unlock(m) perl_tsa_mutex_unlock(m)
 197 #  else
 198 #    define perl_pthread_mutex_lock(m) pthread_mutex_lock(m)
 199 #    define perl_pthread_mutex_unlock(m) pthread_mutex_unlock(m)
 200 #  endif
 201
 202 #  define MUTEX_LOCK(m)                                         \
 203     STMT_START {                                                \
 204         dSAVE_ERRNO;                                            \
 205         int _eC_;                                               \
 206         if ((_eC_ = perl_pthread_mutex_lock((m))))              \
 207             Perl_croak_nocontext("panic: MUTEX_LOCK (%d) [%s:%d]",\
 208                                  _eC_, __FILE__, __LINE__);     \
 209         RESTORE_ERRNO;                                          \
 210     } STMT_END
 211
 212 #  define MUTEX_UNLOCK(m)                                       \
 213     STMT_START {                                                \
 214         dSAVE_ERRNO; /* Shouldn't be necessary as panics if fails */\
 215         int _eC_;                                               \
 216         if ((_eC_ = perl_pthread_mutex_unlock((m)))) {          \
 217             Perl_croak_nocontext(                               \
 218                             "panic: MUTEX_UNLOCK (%d) [%s:%d]", \
 219                                  _eC_, __FILE__, __LINE__);     \
 220         }                                                       \
 221         RESTORE_ERRNO;                                          \
 222     } STMT_END
 223
 224 #  define MUTEX_DESTROY(m)                                      \
 225     STMT_START {                                                \
 226         int _eC_;                                               \
 227         if ((_eC_ = pthread_mutex_destroy((m)))) {              \
 228             Perl_croak_nocontext("panic: MUTEX_DESTROY (%d) [%s:%d]",   \
 229                                  _eC_, __FILE__, __LINE__);     \
 230         }                                                       \
 231     } STMT_END
 232 #endif /* MUTEX_INIT */
 233
 234 #ifndef COND_INIT
 235 #  define COND_INIT(c) \
 236     STMT_START {                                                \
 237         int _eC_;                                               \
 238         if ((_eC_ = pthread_cond_init((c), pthread_condattr_default)))  \
 239             Perl_croak_nocontext("panic: COND_INIT (%d) [%s:%d]",       \
 240                                  _eC_, __FILE__, __LINE__);     \
 241     } STMT_END
 242
 243 #  define COND_SIGNAL(c) \
 244     STMT_START {                                                \
 245         int _eC_;                                               \
 246         if ((_eC_ = pthread_cond_signal((c))))                  \
 247             Perl_croak_nocontext("panic: COND_SIGNAL (%d) [%s:%d]",     \
 248                                  _eC_, __FILE__, __LINE__);     \
 249     } STMT_END
 250
 251 #  define COND_BROADCAST(c) \
 252     STMT_START {                                                \
 253         int _eC_;                                               \
 254         if ((_eC_ = pthread_cond_broadcast((c))))               \
 255             Perl_croak_nocontext("panic: COND_BROADCAST (%d) [%s:%d]",  \
 256                                  _eC_, __FILE__, __LINE__);     \
 257     } STMT_END
 258
 259 #  define COND_WAIT(c, m) \
 260     STMT_START {                                                \
 261         int _eC_;                                               \
 262         if ((_eC_ = pthread_cond_wait((c), (m))))               \
 263             Perl_croak_nocontext("panic: COND_WAIT (%d) [%s:%d]",       \
 264                                  _eC_, __FILE__, __LINE__);     \
 265     } STMT_END
 266
 267 #  define COND_DESTROY(c) \
 268     STMT_START {                                                \
 269         int _eC_;                                               \
 270         if ((_eC_ = pthread_cond_destroy((c))))                 \
 271             Perl_croak_nocontext("panic: COND_DESTROY (%d) [%s:%d]",    \
 272                                  _eC_, __FILE__, __LINE__);     \
 273     } STMT_END
 274 #endif /* COND_INIT */
 275
 276 #if defined(MUTEX_LOCK) && defined(MUTEX_UNLOCK)                \
 277  && defined(COND_SIGNAL) && defined(COND_WAIT)
 278
 279 /* These emulate native many-reader/1-writer locks.
 280  * Basically a locking reader just locks the semaphore long enough to increment
 281  * a counter; and similarly decrements it when when through.  Any writer will
 282  * run only when the count of readers is 0.  That is because it blocks on that
 283  * semaphore (doing a COND_WAIT) until it gets control of it, which won't
 284  * happen unless the count becomes 0.  ALL readers and other writers are then
 285  * blocked until it releases the semaphore.  The reader whose unlocking causes
 286  * the count to become 0 signals any waiting writers, and the system guarantees
 287  * that only one gets control at a time */
 288
 289 #  define PERL_READ_LOCK(mutex)                                     \
 290     STMT_START {                                                    \
 291         MUTEX_LOCK(&(mutex)->lock);                                 \
 292         (mutex)->readers_count++;                                   \
 293         MUTEX_UNLOCK(&(mutex)->lock);                               \
 294     } STMT_END
 295
 296 #  define PERL_READ_UNLOCK(mutex)                                   \
 297     STMT_START {                                                    \
 298         MUTEX_LOCK(&(mutex)->lock);                                 \
 299         (mutex)->readers_count--;                                   \
 300         if ((mutex)->readers_count <= 0) {                          \
 301             assert((mutex)->readers_count == 0);                    \
 302             COND_SIGNAL(&(mutex)->wakeup);                          \
 303             (mutex)->readers_count = 0;                             \
 304         }                                                           \
 305         MUTEX_UNLOCK(&(mutex)->lock);                               \
 306     } STMT_END
 307
 308 #  define PERL_WRITE_LOCK(mutex)                                    \
 309     STMT_START {                                                    \
 310         MUTEX_LOCK(&(mutex)->lock);                                 \
 311         do {                                                        \
 312             if ((mutex)->readers_count <= 0) {                      \
 313                 assert((mutex)->readers_count == 0);                \
 314                 (mutex)->readers_count = 0;                         \
 315                 break;                                              \
 316             }                                                       \
 317             COND_WAIT(&(mutex)->wakeup, &(mutex)->lock);            \
 318         }                                                           \
 319         while (1);                                                  \
 320                                                                     \
 321         /* Here, the mutex is locked, with no readers */            \
 322     } STMT_END
 323
 324 #  define PERL_WRITE_UNLOCK(mutex)                                  \
 325     STMT_START {                                                    \
 326         COND_SIGNAL(&(mutex)->wakeup);                              \
 327         MUTEX_UNLOCK(&(mutex)->lock);                               \
 328     } STMT_END
 329
 330 #  define PERL_RW_MUTEX_INIT(mutex)                                 \
 331     STMT_START {                                                    \
 332         MUTEX_INIT(&(mutex)->lock);                                 \
 333         COND_INIT(&(mutex)->wakeup);                                \
 334         (mutex)->readers_count = 0;                                 \
 335     } STMT_END
 336
 337 #  define PERL_RW_MUTEX_DESTROY(mutex)                              \
 338     STMT_START {                                                    \
 339         COND_DESTROY(&(mutex)->wakeup);                             \
 340         MUTEX_DESTROY(&(mutex)->lock);                              \
 341     } STMT_END
 342
 343 #endif
 344
 345 /* DETACH(t) must only be called while holding t->mutex */
 346 #ifndef DETACH
 347 #  define DETACH(t) \
 348     STMT_START {                                                \
 349         int _eC_;                                               \
 350         if ((_eC_ = pthread_detach((t)->self))) {               \
 351             MUTEX_UNLOCK(&(t)->mutex);                          \
 352             Perl_croak_nocontext("panic: DETACH (%d) [%s:%d]",  \
 353                                  _eC_, __FILE__, __LINE__);     \
 354         }                                                       \
 355     } STMT_END
 356 #endif /* DETACH */
 357
 358 #ifndef JOIN
 359 #  define JOIN(t, avp) \
 360     STMT_START {                                                \
 361         int _eC_;                                               \
 362         if ((_eC_ = pthread_join((t)->self, (void**)(avp))))    \
 363             Perl_croak_nocontext("panic: pthread_join (%d) [%s:%d]",    \
 364                                  _eC_, __FILE__, __LINE__);     \
 365     } STMT_END
 366 #endif /* JOIN */
 367
 368 /* Use an unchecked fetch of thread-specific data instead of a checked one.
 369  * It would fail if the key were bogus, but if the key were bogus then
 370  * Really Bad Things would be happening anyway. --dan */
 371 #if (defined(__ALPHA) && (__VMS_VER >= 70000000)) || \
 372     (defined(__alpha) && defined(__osf__) && !defined(__GNUC__)) /* Available only on >= 4.0 */
 373 #  define HAS_PTHREAD_UNCHECKED_GETSPECIFIC_NP /* Configure test needed */
 374 #endif
 375
 376 #ifdef HAS_PTHREAD_UNCHECKED_GETSPECIFIC_NP
 377 #  define PTHREAD_GETSPECIFIC(key) pthread_unchecked_getspecific_np(key)
 378 #else
 379 #    define PTHREAD_GETSPECIFIC(key) pthread_getspecific(key)
 380 #endif
 381
 382 #if defined(PERL_THREAD_LOCAL) && !defined(PERL_GET_CONTEXT) && !defined(PERL_SET_CONTEXT) && !defined(__cplusplus)
 383 /* Use C11 thread-local storage, where possible.
 384  * Frustratingly we can't use it for C++ extensions, C++ and C disagree on the
 385  * syntax used for thread local storage, meaning that the working token that
 386  * Configure probed for C turns out to be a compiler error on C++. Great.
 387  * (Well, unless one or both is supporting non-standard syntax as an extension)
 388  * As Configure doesn't have a way to probe for C++ dialects, we just take the
 389  * safe option and do the same as 5.34.0 and earlier - use pthreads on C++.
 390  * Of course, if C++ XS extensions really want to avoid *all* this overhead,
 391  * they should #define PERL_NO_GET_CONTEXT and pass aTHX/aTHX_ explicitly) */
 392 #  define PERL_USE_THREAD_LOCAL
 393 extern PERL_THREAD_LOCAL void *PL_current_context;
 394
 395 #  define PERL_GET_CONTEXT        PL_current_context
 396
 397 /* We must also call pthread_setspecific() always, as C++ code has to read it
 398  * with pthreads (the #else side just below) */
 399
 400 #  define PERL_SET_CONTEXT(t)                                           \
 401     STMT_START {                                                        \
 402         int _eC_;                                                       \
 403         if ((_eC_ = pthread_setspecific(PL_thr_key, PL_current_context = (void *)(t)))) \
 404             Perl_croak_nocontext("panic: pthread_setspecific (%d) [%s:%d]", \
 405                                  _eC_, __FILE__, __LINE__);             \
 406     } STMT_END
 407
 408 #else
 409 /* else fall back to pthreads */
 410
 411 #  ifndef PERL_GET_CONTEXT
 412 #    define PERL_GET_CONTEXT    PTHREAD_GETSPECIFIC(PL_thr_key)
 413 #  endif
 414
 415 /* For C++ extensions built on a system where the C compiler provides thread
 416  * local storage that call PERL_SET_CONTEXT() also need to set
 417  * PL_current_context, so need to call into C code to do this.
 418  * To avoid exploding code complexity, do this also on C platforms that don't
 419  * support thread local storage. PERL_SET_CONTEXT is not called that often. */
 420
 421 #  ifndef PERL_SET_CONTEXT
 422 #    define PERL_SET_CONTEXT(t) Perl_set_context((void*)t)
 423 #  endif /* PERL_SET_CONTEXT */
 424 #endif /* PERL_THREAD_LOCAL */
 425
 426 #ifndef INIT_THREADS
 427 #  ifdef NEED_PTHREAD_INIT
 428 #    define INIT_THREADS pthread_init()
 429 #  endif
 430 #endif
 431
 432 #ifndef ALLOC_THREAD_KEY
 433 #  define ALLOC_THREAD_KEY \
 434     STMT_START {                                                \
 435         if (pthread_key_create(&PL_thr_key, 0)) {               \
 436             PERL_UNUSED_RESULT(write(2, STR_WITH_LEN("panic: pthread_key_create failed\n"))); \
 437             exit(1);                                            \
 438         }                                                       \
 439     } STMT_END
 440 #endif
 441
 442 #ifndef FREE_THREAD_KEY
 443 #  define FREE_THREAD_KEY \
 444     STMT_START {                                                \
 445         pthread_key_delete(PL_thr_key);                         \
 446     } STMT_END
 447 #endif
 448
 449 #ifndef PTHREAD_ATFORK
 450 #  ifdef HAS_PTHREAD_ATFORK
 451 #    define PTHREAD_ATFORK(prepare,parent,child)                \
 452         pthread_atfork(prepare,parent,child)
 453 #  else
 454 #    define PTHREAD_ATFORK(prepare,parent,child)                \
 455         NOOP
 456 #  endif
 457 #endif
 458
 459 #ifndef THREAD_RET_TYPE
 460 #  define THREAD_RET_TYPE       void *
 461 #endif /* THREAD_RET */
 462
 463 #  define LOCK_DOLLARZERO_MUTEX         MUTEX_LOCK(&PL_dollarzero_mutex)
 464 #  define UNLOCK_DOLLARZERO_MUTEX       MUTEX_UNLOCK(&PL_dollarzero_mutex)
 465
 466 #endif /* USE_ITHREADS */
 467
 468 #ifndef MUTEX_LOCK
 469 #  define MUTEX_LOCK(m)           NOOP
 470 #endif
 471
 472 #ifndef MUTEX_UNLOCK
 473 #  define MUTEX_UNLOCK(m)         NOOP
 474 #endif
 475
 476 #ifndef MUTEX_INIT
 477 #  define MUTEX_INIT(m)           NOOP
 478 #endif
 479
 480 #ifndef MUTEX_DESTROY
 481 #  define MUTEX_DESTROY(m)        NOOP
 482 #endif
 483
 484 #ifndef COND_INIT
 485 #  define COND_INIT(c)            NOOP
 486 #endif
 487
 488 #ifndef COND_SIGNAL
 489 #  define COND_SIGNAL(c)          NOOP
 490 #endif
 491
 492 #ifndef COND_BROADCAST
 493 #  define COND_BROADCAST(c)       NOOP
 494 #endif
 495
 496 #ifndef COND_WAIT
 497 #  define COND_WAIT(c, m)         NOOP
 498 #endif
 499
 500 #ifndef COND_DESTROY
 501 #  define COND_DESTROY(c)         NOOP
 502 #endif
 503
 504 #ifndef PERL_READ_LOCK
 505 #  define PERL_READ_LOCK          NOOP
 506 #  define PERL_READ_UNLOCK        NOOP
 507 #  define PERL_WRITE_LOCK         NOOP
 508 #  define PERL_WRITE_UNLOCK       NOOP
 509 #  define PERL_RW_MUTEX_INIT      NOOP
 510 #  define PERL_RW_MUTEX_DESTROY   NOOP
 511 #endif
 512
 513 #ifndef LOCK_DOLLARZERO_MUTEX
 514 #  define LOCK_DOLLARZERO_MUTEX   NOOP
 515 #endif
 516
 517 #ifndef UNLOCK_DOLLARZERO_MUTEX
 518 #  define UNLOCK_DOLLARZERO_MUTEX NOOP
 519 #endif
 520
 521 /* THR, SET_THR, and dTHR are there for compatibility with old versions */
 522 #ifndef THR
 523 #  define THR           PERL_GET_THX
 524 #endif
 525
 526 #ifndef SET_THR
 527 #  define SET_THR(t)    PERL_SET_THX(t)
 528 #endif
 529
 530 #ifndef dTHR
 531 #  define dTHR dNOOP
 532 #endif
 533
 534 #ifndef INIT_THREADS
 535 #  define INIT_THREADS NOOP
 536 #endif
 537
 538 /*
 539  * ex: set ts=8 sts=4 sw=4 et:
 540  */