thread.h

   1 #if defined(USE_THREADS) || defined(USE_ITHREADS)
   2
   3 #if defined(VMS)
   4 #include <builtins.h>
   5 #endif
   6
   7 #ifdef WIN32
   8 #  include <win32thread.h>
   9 #else
  10 #  ifdef OLD_PTHREADS_API /* Here be dragons. */
  11 #    define DETACH(t) \
  12     STMT_START {                                                \
  13         if (pthread_detach(&(t)->self)) {                       \
  14             MUTEX_UNLOCK(&(t)->mutex);                          \
  15             Perl_croak_nocontext("panic: DETACH");              \
  16         }                                                       \
  17     } STMT_END
  18
  19 #    define PERL_GET_CONTEXT    Perl_get_context()
  20 #    define PERL_SET_CONTEXT(t) Perl_set_context((void*)t)
  21
  22 #    define PTHREAD_GETSPECIFIC_INT
  23 #    ifdef DJGPP
  24 #      define pthread_addr_t any_t
  25 #      define NEED_PTHREAD_INIT
  26 #      define PTHREAD_CREATE_JOINABLE (1)
  27 #    endif
  28 #    ifdef __OPEN_VM
  29 #      define pthread_addr_t void *
  30 #    endif
  31 #    ifdef VMS
  32 #      define pthread_attr_init(a) pthread_attr_create(a)
  33 #      define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_setdetach_np(a,s)
  34 #      define PTHREAD_CREATE(t,a,s,d) pthread_create(t,a,s,d)
  35 #      define pthread_key_create(k,d) pthread_keycreate(k,(pthread_destructor_t)(d))
  36 #      define pthread_mutexattr_init(a) pthread_mutexattr_create(a)
  37 #      define pthread_mutexattr_settype(a,t) pthread_mutexattr_setkind_np(a,t)
  38 #    endif
  39 #    if defined(__hpux) && defined(__ux_version) && __ux_version <= 1020
  40 #      define pthread_attr_init(a) pthread_attr_create(a)
  41        /* XXX pthread_setdetach_np() missing in DCE threads on HP-UX 10.20 */
  42 #      define PTHREAD_ATTR_SETDETACHSTATE(a,s)  (0)
  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(DJGPP) || defined(__OPEN_VM)
  49 #      define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,&(s))
  50 #      define YIELD pthread_yield(NULL)
  51 #    endif
  52 #  endif
  53 #  if !defined(__hpux) || !defined(__ux_version) || __ux_version > 1020
  54 #    define pthread_mutexattr_default NULL
  55 #    define pthread_condattr_default  NULL
  56 #  endif
  57 #endif
  58
  59 #ifndef PTHREAD_CREATE
  60 /* You are not supposed to pass NULL as the 2nd arg of PTHREAD_CREATE(). */
  61 #  define PTHREAD_CREATE(t,a,s,d) pthread_create(t,&(a),s,d)
  62 #endif
  63
  64 #ifndef PTHREAD_ATTR_SETDETACHSTATE
  65 #  define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,s)
  66 #endif
  67
  68 #ifndef PTHREAD_CREATE_JOINABLE
  69 #  ifdef OLD_PTHREAD_CREATE_JOINABLE
  70 #    define PTHREAD_CREATE_JOINABLE OLD_PTHREAD_CREATE_JOINABLE
  71 #  else
  72 #    define PTHREAD_CREATE_JOINABLE 0 /* Panic?  No, guess. */
  73 #  endif
  74 #endif
  75
  76 #ifdef DGUX
  77 #  define THREAD_CREATE_NEEDS_STACK (16*1024)
  78 #endif
  79
  80 #ifdef I_MACH_CTHREADS
  81
  82 /* cthreads interface */
  83
  84 /* #include <mach/cthreads.h> is in perl.h #ifdef I_MACH_CTHREADS */
  85
  86 #define MUTEX_INIT(m) \
  87     STMT_START {                                                \
  88         *m = mutex_alloc();                                     \
  89         if (*m) {                                               \
  90             mutex_init(*m);                                     \
  91         } else {                                                \
  92             Perl_croak_nocontext("panic: MUTEX_INIT");          \
  93         }                                                       \
  94     } STMT_END
  95
  96 #define MUTEX_LOCK(m)                   mutex_lock(*m)
  97 #define MUTEX_UNLOCK(m)                 mutex_unlock(*m)
  98 #define MUTEX_DESTROY(m) \
  99     STMT_START {                                                \
 100         mutex_free(*m);                                         \
 101         *m = 0;                                                 \
 102     } STMT_END
 103
 104 #define COND_INIT(c) \
 105     STMT_START {                                                \
 106         *c = condition_alloc();                                 \
 107         if (*c) {                                               \
 108             condition_init(*c);                                 \
 109         }                                                       \
 110         else {                                                  \
 111             Perl_croak_nocontext("panic: COND_INIT");           \
 112         }                                                       \
 113     } STMT_END
 114
 115 #define COND_SIGNAL(c)          condition_signal(*c)
 116 #define COND_BROADCAST(c)       condition_broadcast(*c)
 117 #define COND_WAIT(c, m)         condition_wait(*c, *m)
 118 #define COND_DESTROY(c) \
 119     STMT_START {                                                \
 120         condition_free(*c);                                     \
 121         *c = 0;                                                 \
 122     } STMT_END
 123
 124 #define THREAD_CREATE(thr, f)   (thr->self = cthread_fork(f, thr), 0)
 125 #define THREAD_POST_CREATE(thr)
 126
 127 #define THREAD_RET_TYPE         any_t
 128 #define THREAD_RET_CAST(x)      ((any_t) x)
 129
 130 #define DETACH(t)               cthread_detach(t->self)
 131 #define JOIN(t, avp)            (*(avp) = (AV *)cthread_join(t->self))
 132
 133 #define PERL_SET_CONTEXT(t)     cthread_set_data(cthread_self(), t)
 134 #define PERL_GET_CONTEXT        cthread_data(cthread_self())
 135
 136 #define INIT_THREADS            cthread_init()
 137 #define YIELD                   cthread_yield()
 138 #define ALLOC_THREAD_KEY        NOOP
 139 #define FREE_THREAD_KEY         NOOP
 140 #define SET_THREAD_SELF(thr)    (thr->self = cthread_self())
 141
 142 #endif /* I_MACH_CTHREADS */
 143
 144 #ifndef YIELD
 145 #  ifdef SCHED_YIELD
 146 #    define YIELD SCHED_YIELD
 147 #  else
 148 #    ifdef HAS_SCHED_YIELD
 149 #      define YIELD sched_yield()
 150 #    else
 151 #      ifdef HAS_PTHREAD_YIELD
 152     /* pthread_yield(NULL) platforms are expected
 153      * to have #defined YIELD for themselves. */
 154 #        define YIELD pthread_yield()
 155 #      endif
 156 #    endif
 157 #  endif
 158 #endif
 159
 160 #ifdef __hpux
 161 #  define MUTEX_INIT_NEEDS_MUTEX_ZEROED
 162 #endif
 163
 164 #ifndef MUTEX_INIT
 165
 166 #  ifdef MUTEX_INIT_NEEDS_MUTEX_ZEROED
 167     /* Temporary workaround, true bug is deeper. --jhi 1999-02-25 */
 168 #    define MUTEX_INIT(m) \
 169     STMT_START {                                                \
 170         Zero((m), 1, perl_mutex);                               \
 171         if (pthread_mutex_init((m), pthread_mutexattr_default)) \
 172             Perl_croak_nocontext("panic: MUTEX_INIT");          \
 173     } STMT_END
 174 #  else
 175 #    define MUTEX_INIT(m) \
 176     STMT_START {                                                \
 177         if (pthread_mutex_init((m), pthread_mutexattr_default)) \
 178             Perl_croak_nocontext("panic: MUTEX_INIT");          \
 179     } STMT_END
 180 #  endif
 181
 182 #  define MUTEX_LOCK(m) \
 183     STMT_START {                                                \
 184         if (pthread_mutex_lock((m)))                            \
 185             Perl_croak_nocontext("panic: MUTEX_LOCK");          \
 186     } STMT_END
 187
 188 #  define MUTEX_UNLOCK(m) \
 189     STMT_START {                                                \
 190         if (pthread_mutex_unlock((m)))                          \
 191             Perl_croak_nocontext("panic: MUTEX_UNLOCK");        \
 192     } STMT_END
 193
 194 #  define MUTEX_DESTROY(m) \
 195     STMT_START {                                                \
 196         if (pthread_mutex_destroy((m)))                         \
 197             Perl_croak_nocontext("panic: MUTEX_DESTROY");       \
 198     } STMT_END
 199 #endif /* MUTEX_INIT */
 200
 201 #ifndef COND_INIT
 202 #  define COND_INIT(c) \
 203     STMT_START {                                                \
 204         if (pthread_cond_init((c), pthread_condattr_default))   \
 205             Perl_croak_nocontext("panic: COND_INIT");           \
 206     } STMT_END
 207
 208 #  define COND_SIGNAL(c) \
 209     STMT_START {                                                \
 210         if (pthread_cond_signal((c)))                           \
 211             Perl_croak_nocontext("panic: COND_SIGNAL");         \
 212     } STMT_END
 213
 214 #  define COND_BROADCAST(c) \
 215     STMT_START {                                                \
 216         if (pthread_cond_broadcast((c)))                        \
 217             Perl_croak_nocontext("panic: COND_BROADCAST");      \
 218     } STMT_END
 219
 220 #  define COND_WAIT(c, m) \
 221     STMT_START {                                                \
 222         if (pthread_cond_wait((c), (m)))                        \
 223             Perl_croak_nocontext("panic: COND_WAIT");           \
 224     } STMT_END
 225
 226 #  define COND_DESTROY(c) \
 227     STMT_START {                                                \
 228         if (pthread_cond_destroy((c)))                          \
 229             Perl_croak_nocontext("panic: COND_DESTROY");        \
 230     } STMT_END
 231 #endif /* COND_INIT */
 232
 233 /* DETACH(t) must only be called while holding t->mutex */
 234 #ifndef DETACH
 235 #  define DETACH(t) \
 236     STMT_START {                                                \
 237         if (pthread_detach((t)->self)) {                        \
 238             MUTEX_UNLOCK(&(t)->mutex);                          \
 239             Perl_croak_nocontext("panic: DETACH");              \
 240         }                                                       \
 241     } STMT_END
 242 #endif /* DETACH */
 243
 244 #ifndef JOIN
 245 #  define JOIN(t, avp) \
 246     STMT_START {                                                \
 247         if (pthread_join((t)->self, (void**)(avp)))             \
 248             Perl_croak_nocontext("panic: pthread_join");        \
 249     } STMT_END
 250 #endif /* JOIN */
 251
 252 /* Use an unchecked fetch of thread-specific data instead of a checked one.
 253  * It would fail if the key were bogus, but if the key were bogus then
 254  * Really Bad Things would be happening anyway. --dan */
 255 #if (defined(__ALPHA) && (__VMS_VER >= 70000000)) || \
 256     (defined(__alpha) && defined(__osf__)) /* Available only on >= 4.0 */
 257 #  define HAS_PTHREAD_UNCHECKED_GETSPECIFIC_NP /* Configure test needed */
 258 #endif
 259
 260 #ifdef HAS_PTHREAD_UNCHECKED_GETSPECIFIC_NP
 261 #  define PTHREAD_GETSPECIFIC(key) pthread_unchecked_getspecific_np(key)
 262 #else
 263 #  define PTHREAD_GETSPECIFIC(key) pthread_getspecific(key)
 264 #endif
 265
 266 #ifndef PERL_GET_CONTEXT
 267 #  define PERL_GET_CONTEXT      PTHREAD_GETSPECIFIC(PL_thr_key)
 268 #endif
 269
 270 #ifndef PERL_SET_CONTEXT
 271 #  define PERL_SET_CONTEXT(t) \
 272     STMT_START {                                                \
 273         if (pthread_setspecific(PL_thr_key, (void *)(t)))       \
 274             Perl_croak_nocontext("panic: pthread_setspecific"); \
 275     } STMT_END
 276 #endif /* PERL_SET_CONTEXT */
 277
 278 #ifndef INIT_THREADS
 279 #  ifdef NEED_PTHREAD_INIT
 280 #    define INIT_THREADS pthread_init()
 281 #  endif
 282 #endif
 283
 284 #ifndef ALLOC_THREAD_KEY
 285 #  define ALLOC_THREAD_KEY \
 286     STMT_START {                                                \
 287         if (pthread_key_create(&PL_thr_key, 0)) {               \
 288             PerlIO_printf(PerlIO_stderr(), "panic: pthread_key_create");        \
 289             exit(1);                                            \
 290         }                                                       \
 291     } STMT_END
 292 #endif
 293
 294 #ifndef FREE_THREAD_KEY
 295 #  define FREE_THREAD_KEY \
 296     STMT_START {                                                \
 297         pthread_key_delete(PL_thr_key);                         \
 298     } STMT_END
 299 #endif
 300
 301 #ifndef THREAD_RET_TYPE
 302 #  define THREAD_RET_TYPE       void *
 303 #  define THREAD_RET_CAST(p)    ((void *)(p))
 304 #endif /* THREAD_RET */
 305
 306 #if defined(USE_THREADS)
 307
 308 /* Accessor for per-thread SVs */
 309 #  define THREADSV(i) (thr->threadsvp[i])
 310
 311 /*
 312  * LOCK_SV_MUTEX and UNLOCK_SV_MUTEX are performance-critical. Here, we
 313  * try only locking them if there may be more than one thread in existence.
 314  * Systems with very fast mutexes (and/or slow conditionals) may wish to
 315  * remove the "if (threadnum) ..." test.
 316  * XXX do NOT use C<if (PL_threadnum) ...> -- it sets up race conditions!
 317  */
 318 #  define LOCK_SV_MUTEX         MUTEX_LOCK(&PL_sv_mutex)
 319 #  define UNLOCK_SV_MUTEX       MUTEX_UNLOCK(&PL_sv_mutex)
 320 #  define LOCK_STRTAB_MUTEX     MUTEX_LOCK(&PL_strtab_mutex)
 321 #  define UNLOCK_STRTAB_MUTEX   MUTEX_UNLOCK(&PL_strtab_mutex)
 322 #  define LOCK_CRED_MUTEX       MUTEX_LOCK(&PL_cred_mutex)
 323 #  define UNLOCK_CRED_MUTEX     MUTEX_UNLOCK(&PL_cred_mutex)
 324 #  define LOCK_FDPID_MUTEX      MUTEX_LOCK(&PL_fdpid_mutex)
 325 #  define UNLOCK_FDPID_MUTEX    MUTEX_UNLOCK(&PL_fdpid_mutex)
 326 #  define LOCK_SV_LOCK_MUTEX    MUTEX_LOCK(&PL_sv_lock_mutex)
 327 #  define UNLOCK_SV_LOCK_MUTEX  MUTEX_UNLOCK(&PL_sv_lock_mutex)
 328
 329 /* Values and macros for thr->flags */
 330 #define THRf_STATE_MASK 7
 331 #define THRf_R_JOINABLE 0
 332 #define THRf_R_JOINED   1
 333 #define THRf_R_DETACHED 2
 334 #define THRf_ZOMBIE     3
 335 #define THRf_DEAD       4
 336
 337 #define THRf_DID_DIE    8
 338
 339 /* ThrSTATE(t) and ThrSETSTATE(t) must only be called while holding t->mutex */
 340 #define ThrSTATE(t) ((t)->flags & THRf_STATE_MASK)
 341 #define ThrSETSTATE(t, s) STMT_START {          \
 342         (t)->flags &= ~THRf_STATE_MASK;         \
 343         (t)->flags |= (s);                      \
 344         DEBUG_S(PerlIO_printf(Perl_debug_log,   \
 345                               "thread %p set to state %d\n", (t), (s))); \
 346     } STMT_END
 347
 348 typedef struct condpair {
 349     perl_mutex  mutex;          /* Protects all other fields */
 350     perl_cond   owner_cond;     /* For when owner changes at all */
 351     perl_cond   cond;           /* For cond_signal and cond_broadcast */
 352     Thread      owner;          /* Currently owning thread */
 353 } condpair_t;
 354
 355 #define MgMUTEXP(mg) (&((condpair_t *)(mg->mg_ptr))->mutex)
 356 #define MgOWNERCONDP(mg) (&((condpair_t *)(mg->mg_ptr))->owner_cond)
 357 #define MgCONDP(mg) (&((condpair_t *)(mg->mg_ptr))->cond)
 358 #define MgOWNER(mg) ((condpair_t *)(mg->mg_ptr))->owner
 359
 360 #endif /* USE_THREADS */
 361 #endif /* USE_THREADS || USE_ITHREADS */
 362
 363 #ifndef MUTEX_LOCK
 364 #  define MUTEX_LOCK(m)
 365 #endif
 366
 367 #ifndef MUTEX_UNLOCK
 368 #  define MUTEX_UNLOCK(m)
 369 #endif
 370
 371 #ifndef MUTEX_INIT
 372 #  define MUTEX_INIT(m)
 373 #endif
 374
 375 #ifndef MUTEX_DESTROY
 376 #  define MUTEX_DESTROY(m)
 377 #endif
 378
 379 #ifndef COND_INIT
 380 #  define COND_INIT(c)
 381 #endif
 382
 383 #ifndef COND_SIGNAL
 384 #  define COND_SIGNAL(c)
 385 #endif
 386
 387 #ifndef COND_BROADCAST
 388 #  define COND_BROADCAST(c)
 389 #endif
 390
 391 #ifndef COND_WAIT
 392 #  define COND_WAIT(c, m)
 393 #endif
 394
 395 #ifndef COND_DESTROY
 396 #  define COND_DESTROY(c)
 397 #endif
 398
 399 #ifndef LOCK_SV_MUTEX
 400 #  define LOCK_SV_MUTEX
 401 #endif
 402
 403 #ifndef UNLOCK_SV_MUTEX
 404 #  define UNLOCK_SV_MUTEX
 405 #endif
 406
 407 #ifndef LOCK_STRTAB_MUTEX
 408 #  define LOCK_STRTAB_MUTEX
 409 #endif
 410
 411 #ifndef UNLOCK_STRTAB_MUTEX
 412 #  define UNLOCK_STRTAB_MUTEX
 413 #endif
 414
 415 #ifndef LOCK_CRED_MUTEX
 416 #  define LOCK_CRED_MUTEX
 417 #endif
 418
 419 #ifndef UNLOCK_CRED_MUTEX
 420 #  define UNLOCK_CRED_MUTEX
 421 #endif
 422
 423 #ifndef LOCK_FDPID_MUTEX
 424 #  define LOCK_FDPID_MUTEX
 425 #endif
 426
 427 #ifndef UNLOCK_FDPID_MUTEX
 428 #  define UNLOCK_FDPID_MUTEX
 429 #endif
 430
 431 #ifndef LOCK_SV_LOCK_MUTEX
 432 #  define LOCK_SV_LOCK_MUTEX
 433 #endif
 434
 435 #ifndef UNLOCK_SV_LOCK_MUTEX
 436 #  define UNLOCK_SV_LOCK_MUTEX
 437 #endif
 438
 439 /* THR, SET_THR, and dTHR are there for compatibility with old versions */
 440 #ifndef THR
 441 #  define THR           PERL_GET_THX
 442 #endif
 443
 444 #ifndef SET_THR
 445 #  define SET_THR(t)    PERL_SET_THX(t)
 446 #endif
 447
 448 #ifndef dTHR
 449 #  define dTHR dNOOP
 450 #endif
 451
 452 #ifndef INIT_THREADS
 453 #  define INIT_THREADS NOOP
 454 #endif