thread.h

   1 /*    thread.h
   2  *
   3  *    Copyright (C) 1999, 2000, 2001, 2002, 2004, by Larry Wall and others
   4  *
   5  *    You may distribute under the terms of either the GNU General Public
   6  *    License or the Artistic License, as specified in the README file.
   7  *
   8  */
   9
  10 #if defined(USE_ITHREADS)
  11
  12 #if defined(VMS)
  13 #include <builtins.h>
  14 #endif
  15
  16 #ifdef WIN32
  17 #  include <win32thread.h>
  18 #else
  19 #ifdef NETWARE
  20 #  include <nw5thread.h>
  21 #else
  22 #  ifdef OLD_PTHREADS_API /* Here be dragons. */
  23 #    define DETACH(t) \
  24     STMT_START {                                                \
  25         int _eC_;                                               \
  26         if ((_eC_ = pthread_detach(&(t)->self))) {              \
  27             MUTEX_UNLOCK(&(t)->mutex);                          \
  28             Perl_croak_nocontext("panic: DETACH (%d) [%s:%d]",  \
  29                                  _eC_, __FILE__, __LINE__);     \
  30         }                                                       \
  31     } STMT_END
  32
  33 #    define PERL_GET_CONTEXT    Perl_get_context()
  34 #    define PERL_SET_CONTEXT(t) Perl_set_context((void*)t)
  35
  36 #    define PTHREAD_GETSPECIFIC_INT
  37 #    ifdef DJGPP
  38 #      define pthread_addr_t any_t
  39 #      define NEED_PTHREAD_INIT
  40 #      define PTHREAD_CREATE_JOINABLE (1)
  41 #    endif
  42 #    ifdef __OPEN_VM
  43 #      define pthread_addr_t void *
  44 #    endif
  45 #    ifdef OEMVS
  46 #      define pthread_addr_t void *
  47 #      define pthread_create(t,a,s,d)        pthread_create(t,&(a),s,d)
  48 #      define pthread_keycreate              pthread_key_create
  49 #    endif
  50 #    ifdef VMS
  51 #      define pthread_attr_init(a) pthread_attr_create(a)
  52 #      define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_setdetach_np(a,s)
  53 #      define PTHREAD_CREATE(t,a,s,d) pthread_create(t,a,s,d)
  54 #      define pthread_key_create(k,d) pthread_keycreate(k,(pthread_destructor_t)(d))
  55 #      define pthread_mutexattr_init(a) pthread_mutexattr_create(a)
  56 #      define pthread_mutexattr_settype(a,t) pthread_mutexattr_setkind_np(a,t)
  57 #    endif
  58 #    if defined(__hpux) && defined(__ux_version) && __ux_version <= 1020
  59 #      define pthread_attr_init(a) pthread_attr_create(a)
  60        /* XXX pthread_setdetach_np() missing in DCE threads on HP-UX 10.20 */
  61 #      define PTHREAD_ATTR_SETDETACHSTATE(a,s)  (0)
  62 #      define PTHREAD_CREATE(t,a,s,d) pthread_create(t,a,s,d)
  63 #      define pthread_key_create(k,d) pthread_keycreate(k,(pthread_destructor_t)(d))
  64 #      define pthread_mutexattr_init(a) pthread_mutexattr_create(a)
  65 #      define pthread_mutexattr_settype(a,t) pthread_mutexattr_setkind_np(a,t)
  66 #    endif
  67 #    if defined(DJGPP) || defined(__OPEN_VM) || defined(OEMVS)
  68 #      define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,&(s))
  69 #      define YIELD pthread_yield(NULL)
  70 #    endif
  71 #  endif
  72 #  if !defined(__hpux) || !defined(__ux_version) || __ux_version > 1020
  73 #    define pthread_mutexattr_default NULL
  74 #    define pthread_condattr_default  NULL
  75 #  endif
  76 #endif  /* NETWARE */
  77 #endif
  78
  79 #ifndef PTHREAD_CREATE
  80 /* You are not supposed to pass NULL as the 2nd arg of PTHREAD_CREATE(). */
  81 #  define PTHREAD_CREATE(t,a,s,d) pthread_create(t,&(a),s,d)
  82 #endif
  83
  84 #ifndef PTHREAD_ATTR_SETDETACHSTATE
  85 #  define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,s)
  86 #endif
  87
  88 #ifndef PTHREAD_CREATE_JOINABLE
  89 #  ifdef OLD_PTHREAD_CREATE_JOINABLE
  90 #    define PTHREAD_CREATE_JOINABLE OLD_PTHREAD_CREATE_JOINABLE
  91 #  else
  92 #    define PTHREAD_CREATE_JOINABLE 0 /* Panic?  No, guess. */
  93 #  endif
  94 #endif
  95
  96 #ifdef DGUX
  97 #  define THREAD_CREATE_NEEDS_STACK (32*1024)
  98 #endif
  99
 100 #ifdef I_MACH_CTHREADS
 101
 102 /* cthreads interface */
 103
 104 /* #include <mach/cthreads.h> is in perl.h #ifdef I_MACH_CTHREADS */
 105
 106 #define MUTEX_INIT(m) \
 107     STMT_START {                                                \
 108         *m = mutex_alloc();                                     \
 109         if (*m) {                                               \
 110             mutex_init(*m);                                     \
 111         } else {                                                \
 112             Perl_croak_nocontext("panic: MUTEX_INIT [%s:%d]",   \
 113                                  __FILE__, __LINE__);           \
 114         }                                                       \
 115     } STMT_END
 116
 117 #define MUTEX_LOCK(m)                   mutex_lock(*m)
 118 #define MUTEX_UNLOCK(m)                 mutex_unlock(*m)
 119 #define MUTEX_DESTROY(m) \
 120     STMT_START {                                                \
 121         mutex_free(*m);                                         \
 122         *m = 0;                                                 \
 123     } STMT_END
 124
 125 #define COND_INIT(c) \
 126     STMT_START {                                                \
 127         *c = condition_alloc();                                 \
 128         if (*c) {                                               \
 129             condition_init(*c);                                 \
 130         }                                                       \
 131         else {                                                  \
 132             Perl_croak_nocontext("panic: COND_INIT [%s:%d]",    \
 133                                  __FILE__, __LINE__);           \
 134         }                                                       \
 135     } STMT_END
 136
 137 #define COND_SIGNAL(c)          condition_signal(*c)
 138 #define COND_BROADCAST(c)       condition_broadcast(*c)
 139 #define COND_WAIT(c, m)         condition_wait(*c, *m)
 140 #define COND_DESTROY(c) \
 141     STMT_START {                                                \
 142         condition_free(*c);                                     \
 143         *c = 0;                                                 \
 144     } STMT_END
 145
 146 #define THREAD_CREATE(thr, f)   (thr->self = cthread_fork(f, thr), 0)
 147 #define THREAD_POST_CREATE(thr)
 148
 149 #define THREAD_RET_TYPE         any_t
 150 #define THREAD_RET_CAST(x)      ((any_t) x)
 151
 152 #define DETACH(t)               cthread_detach(t->self)
 153 #define JOIN(t, avp)            (*(avp) = (AV *)cthread_join(t->self))
 154
 155 #define PERL_SET_CONTEXT(t)     cthread_set_data(cthread_self(), t)
 156 #define PERL_GET_CONTEXT        cthread_data(cthread_self())
 157
 158 #define INIT_THREADS            cthread_init()
 159 #define YIELD                   cthread_yield()
 160 #define ALLOC_THREAD_KEY        NOOP
 161 #define FREE_THREAD_KEY         NOOP
 162 #define SET_THREAD_SELF(thr)    (thr->self = cthread_self())
 163
 164 #endif /* I_MACH_CTHREADS */
 165
 166 #ifndef YIELD
 167 #  ifdef SCHED_YIELD
 168 #    define YIELD SCHED_YIELD
 169 #  else
 170 #    ifdef HAS_SCHED_YIELD
 171 #      define YIELD sched_yield()
 172 #    else
 173 #      ifdef HAS_PTHREAD_YIELD
 174     /* pthread_yield(NULL) platforms are expected
 175      * to have #defined YIELD for themselves. */
 176 #        define YIELD pthread_yield()
 177 #      endif
 178 #    endif
 179 #  endif
 180 #endif
 181
 182 #ifdef __hpux
 183 #  define MUTEX_INIT_NEEDS_MUTEX_ZEROED
 184 #endif
 185
 186 #ifndef MUTEX_INIT
 187
 188 #  ifdef MUTEX_INIT_NEEDS_MUTEX_ZEROED
 189     /* Temporary workaround, true bug is deeper. --jhi 1999-02-25 */
 190 #    define MUTEX_INIT(m) \
 191     STMT_START {                                                \
 192         int _eC_;                                               \
 193         Zero((m), 1, perl_mutex);                               \
 194         if ((_eC_ = pthread_mutex_init((m), pthread_mutexattr_default)))        \
 195             Perl_croak_nocontext("panic: MUTEX_INIT (%d) [%s:%d]",      \
 196                                  _eC_, __FILE__, __LINE__);     \
 197     } STMT_END
 198 #  else
 199 #    define MUTEX_INIT(m) \
 200     STMT_START {                                                \
 201         int _eC_;                                               \
 202         if ((_eC_ = pthread_mutex_init((m), pthread_mutexattr_default)))        \
 203             Perl_croak_nocontext("panic: MUTEX_INIT (%d) [%s:%d]",      \
 204                                  _eC_, __FILE__, __LINE__);     \
 205     } STMT_END
 206 #  endif
 207
 208 #  define MUTEX_LOCK(m) \
 209     STMT_START {                                                \
 210         int _eC_;                                               \
 211         if ((_eC_ = pthread_mutex_lock((m))))                   \
 212             Perl_croak_nocontext("panic: MUTEX_LOCK (%d) [%s:%d]",      \
 213                                  _eC_, __FILE__, __LINE__);     \
 214     } STMT_END
 215
 216 #  define MUTEX_UNLOCK(m) \
 217     STMT_START {                                                \
 218         int _eC_;                                               \
 219         if ((_eC_ = pthread_mutex_unlock((m))))                 \
 220             Perl_croak_nocontext("panic: MUTEX_UNLOCK (%d) [%s:%d]",    \
 221                                  _eC_, __FILE__, __LINE__);     \
 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     } STMT_END
 231 #endif /* MUTEX_INIT */
 232
 233 #ifndef COND_INIT
 234 #  define COND_INIT(c) \
 235     STMT_START {                                                \
 236         int _eC_;                                               \
 237         if ((_eC_ = pthread_cond_init((c), pthread_condattr_default)))  \
 238             Perl_croak_nocontext("panic: COND_INIT (%d) [%s:%d]",       \
 239                                  _eC_, __FILE__, __LINE__);     \
 240     } STMT_END
 241
 242 #  define COND_SIGNAL(c) \
 243     STMT_START {                                                \
 244         int _eC_;                                               \
 245         if ((_eC_ = pthread_cond_signal((c))))                  \
 246             Perl_croak_nocontext("panic: COND_SIGNAL (%d) [%s:%d]",     \
 247                                  _eC_, __FILE__, __LINE__);     \
 248     } STMT_END
 249
 250 #  define COND_BROADCAST(c) \
 251     STMT_START {                                                \
 252         int _eC_;                                               \
 253         if ((_eC_ = pthread_cond_broadcast((c))))               \
 254             Perl_croak_nocontext("panic: COND_BROADCAST (%d) [%s:%d]",  \
 255                                  _eC_, __FILE__, __LINE__);     \
 256     } STMT_END
 257
 258 #  define COND_WAIT(c, m) \
 259     STMT_START {                                                \
 260         int _eC_;                                               \
 261         if ((_eC_ = pthread_cond_wait((c), (m))))               \
 262             Perl_croak_nocontext("panic: COND_WAIT (%d) [%s:%d]",       \
 263                                  _eC_, __FILE__, __LINE__);     \
 264     } STMT_END
 265
 266 #  define COND_DESTROY(c) \
 267     STMT_START {                                                \
 268         int _eC_;                                               \
 269         if ((_eC_ = pthread_cond_destroy((c))))                 \
 270             Perl_croak_nocontext("panic: COND_DESTROY (%d) [%s:%d]",    \
 271                                  _eC_, __FILE__, __LINE__);     \
 272     } STMT_END
 273 #endif /* COND_INIT */
 274
 275 /* DETACH(t) must only be called while holding t->mutex */
 276 #ifndef DETACH
 277 #  define DETACH(t) \
 278     STMT_START {                                                \
 279         int _eC_;                                               \
 280         if ((_eC_ = pthread_detach((t)->self))) {               \
 281             MUTEX_UNLOCK(&(t)->mutex);                          \
 282             Perl_croak_nocontext("panic: DETACH (%d) [%s:%d]",  \
 283                                  _eC_, __FILE__, __LINE__);     \
 284         }                                                       \
 285     } STMT_END
 286 #endif /* DETACH */
 287
 288 #ifndef JOIN
 289 #  define JOIN(t, avp) \
 290     STMT_START {                                                \
 291         int _eC_;                                               \
 292         if ((_eC_ = pthread_join((t)->self, (void**)(avp))))    \
 293             Perl_croak_nocontext("panic: pthread_join (%d) [%s:%d]",    \
 294                                  _eC_, __FILE__, __LINE__);     \
 295     } STMT_END
 296 #endif /* JOIN */
 297
 298 /* Use an unchecked fetch of thread-specific data instead of a checked one.
 299  * It would fail if the key were bogus, but if the key were bogus then
 300  * Really Bad Things would be happening anyway. --dan */
 301 #if (defined(__ALPHA) && (__VMS_VER >= 70000000)) || \
 302     (defined(__alpha) && defined(__osf__) && !defined(__GNUC__)) /* Available only on >= 4.0 */
 303 #  define HAS_PTHREAD_UNCHECKED_GETSPECIFIC_NP /* Configure test needed */
 304 #endif
 305
 306 #ifdef HAS_PTHREAD_UNCHECKED_GETSPECIFIC_NP
 307 #  define PTHREAD_GETSPECIFIC(key) pthread_unchecked_getspecific_np(key)
 308 #else
 309 #    define PTHREAD_GETSPECIFIC(key) pthread_getspecific(key)
 310 #endif
 311
 312 #ifndef PERL_GET_CONTEXT
 313 #  define PERL_GET_CONTEXT      PTHREAD_GETSPECIFIC(PL_thr_key)
 314 #endif
 315
 316 #ifndef PERL_SET_CONTEXT
 317 #  define PERL_SET_CONTEXT(t) \
 318     STMT_START {                                                \
 319         int _eC_;                                               \
 320         if ((_eC_ = pthread_setspecific(PL_thr_key, (void *)(t))))      \
 321             Perl_croak_nocontext("panic: pthread_setspecific (%d) [%s:%d]",     \
 322                                  _eC_, __FILE__, __LINE__);     \
 323     } STMT_END
 324 #endif /* PERL_SET_CONTEXT */
 325
 326 #ifndef INIT_THREADS
 327 #  ifdef NEED_PTHREAD_INIT
 328 #    define INIT_THREADS pthread_init()
 329 #  endif
 330 #endif
 331
 332 #ifndef ALLOC_THREAD_KEY
 333 #  define ALLOC_THREAD_KEY \
 334     STMT_START {                                                \
 335         int _eC_;                                               \
 336         if ((_eC_ = pthread_key_create(&PL_thr_key, 0))) {      \
 337             write(2, "panic: pthread_key_create failed\n", 33); \
 338             exit(1);                                            \
 339         }                                                       \
 340     } STMT_END
 341 #endif
 342
 343 #ifndef FREE_THREAD_KEY
 344 #  define FREE_THREAD_KEY \
 345     STMT_START {                                                \
 346         pthread_key_delete(PL_thr_key);                         \
 347     } STMT_END
 348 #endif
 349
 350 #ifndef PTHREAD_ATFORK
 351 #  ifdef HAS_PTHREAD_ATFORK
 352 #    define PTHREAD_ATFORK(prepare,parent,child)                \
 353         pthread_atfork(prepare,parent,child)
 354 #  else
 355 #    define PTHREAD_ATFORK(prepare,parent,child)                \
 356         NOOP
 357 #  endif
 358 #endif
 359
 360 #ifndef THREAD_RET_TYPE
 361 #  define THREAD_RET_TYPE       void *
 362 #  define THREAD_RET_CAST(p)    ((void *)(p))
 363 #endif /* THREAD_RET */
 364
 365 #  define LOCK_DOLLARZERO_MUTEX         MUTEX_LOCK(&PL_dollarzero_mutex)
 366 #  define UNLOCK_DOLLARZERO_MUTEX       MUTEX_UNLOCK(&PL_dollarzero_mutex)
 367
 368 #endif /* USE_ITHREADS */
 369
 370 #ifndef MUTEX_LOCK
 371 #  define MUTEX_LOCK(m)
 372 #endif
 373
 374 #ifndef MUTEX_UNLOCK
 375 #  define MUTEX_UNLOCK(m)
 376 #endif
 377
 378 #ifndef MUTEX_INIT
 379 #  define MUTEX_INIT(m)
 380 #endif
 381
 382 #ifndef MUTEX_DESTROY
 383 #  define MUTEX_DESTROY(m)
 384 #endif
 385
 386 #ifndef COND_INIT
 387 #  define COND_INIT(c)
 388 #endif
 389
 390 #ifndef COND_SIGNAL
 391 #  define COND_SIGNAL(c)
 392 #endif
 393
 394 #ifndef COND_BROADCAST
 395 #  define COND_BROADCAST(c)
 396 #endif
 397
 398 #ifndef COND_WAIT
 399 #  define COND_WAIT(c, m)
 400 #endif
 401
 402 #ifndef COND_DESTROY
 403 #  define COND_DESTROY(c)
 404 #endif
 405
 406 #ifndef LOCK_SV_MUTEX
 407 #  define LOCK_SV_MUTEX
 408 #endif
 409
 410 #ifndef UNLOCK_SV_MUTEX
 411 #  define UNLOCK_SV_MUTEX
 412 #endif
 413
 414 #ifndef LOCK_STRTAB_MUTEX
 415 #  define LOCK_STRTAB_MUTEX
 416 #endif
 417
 418 #ifndef UNLOCK_STRTAB_MUTEX
 419 #  define UNLOCK_STRTAB_MUTEX
 420 #endif
 421
 422 #ifndef LOCK_CRED_MUTEX
 423 #  define LOCK_CRED_MUTEX
 424 #endif
 425
 426 #ifndef UNLOCK_CRED_MUTEX
 427 #  define UNLOCK_CRED_MUTEX
 428 #endif
 429
 430 #ifndef LOCK_FDPID_MUTEX
 431 #  define LOCK_FDPID_MUTEX
 432 #endif
 433
 434 #ifndef UNLOCK_FDPID_MUTEX
 435 #  define UNLOCK_FDPID_MUTEX
 436 #endif
 437
 438 #ifndef LOCK_SV_LOCK_MUTEX
 439 #  define LOCK_SV_LOCK_MUTEX
 440 #endif
 441
 442 #ifndef UNLOCK_SV_LOCK_MUTEX
 443 #  define UNLOCK_SV_LOCK_MUTEX
 444 #endif
 445
 446 #ifndef LOCK_DOLLARZERO_MUTEX
 447 #  define LOCK_DOLLARZERO_MUTEX
 448 #endif
 449
 450 #ifndef UNLOCK_DOLLARZERO_MUTEX
 451 #  define UNLOCK_DOLLARZERO_MUTEX
 452 #endif
 453
 454 /* THR, SET_THR, and dTHR are there for compatibility with old versions */
 455 #ifndef THR
 456 #  define THR           PERL_GET_THX
 457 #endif
 458
 459 #ifndef SET_THR
 460 #  define SET_THR(t)    PERL_SET_THX(t)
 461 #endif
 462
 463 #ifndef dTHR
 464 #  define dTHR dNOOP
 465 #endif
 466
 467 #ifndef INIT_THREADS
 468 #  define INIT_THREADS NOOP
 469 #endif