thread.h

   1 #ifdef USE_THREADS
   2
   3 #ifdef WIN32
   4 #  include <win32thread.h>
   5 #else
   6 #  ifdef OLD_PTHREADS_API /* Here be dragons. */
   7 #    define DETACH(t)                           \
   8     STMT_START {                                \
   9         if (pthread_detach(&(t)->self)) {       \
  10             MUTEX_UNLOCK(&(t)->mutex);          \
  11             Perl_croak(aTHX_ "panic: DETACH");          \
  12         }                                       \
  13     } STMT_END
  14 #    define THR getTHR()
  15 struct perl_thread *getTHR (void);
  16 #    define PTHREAD_GETSPECIFIC_INT
  17 #    ifdef DJGPP
  18 #      define pthread_addr_t any_t
  19 #      define NEED_PTHREAD_INIT
  20 #      define PTHREAD_CREATE_JOINABLE (1)
  21 #    endif
  22 #    ifdef __OPEN_VM
  23 #      define pthread_addr_t void *
  24 #    endif
  25 #    ifdef VMS
  26 #      define pthread_attr_init(a) pthread_attr_create(a)
  27 #      define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_setdetach_np(a,s)
  28 #      define PTHREAD_CREATE(t,a,s,d) pthread_create(t,a,s,d)
  29 #      define pthread_key_create(k,d) pthread_keycreate(k,(pthread_destructor_t)(d))
  30 #      define pthread_mutexattr_init(a) pthread_mutexattr_create(a)
  31 #      define pthread_mutexattr_settype(a,t) pthread_mutexattr_setkind_np(a,t)
  32 #    endif
  33 #    if defined(DJGPP) || defined(__OPEN_VM)
  34 #      define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,&(s))
  35 #      define YIELD pthread_yield(NULL)
  36 #    endif
  37 #  endif
  38 #    define pthread_mutexattr_default NULL
  39 #    define pthread_condattr_default  NULL
  40 #endif
  41
  42 #ifndef PTHREAD_CREATE
  43 /* You are not supposed to pass NULL as the 2nd arg of PTHREAD_CREATE(). */
  44 #  define PTHREAD_CREATE(t,a,s,d) pthread_create(t,&(a),s,d)
  45 #endif
  46
  47 #ifndef PTHREAD_ATTR_SETDETACHSTATE
  48 #  define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,s)
  49 #endif
  50
  51 #ifndef PTHREAD_CREATE_JOINABLE
  52 #  ifdef OLD_PTHREAD_CREATE_JOINABLE
  53 #    define PTHREAD_CREATE_JOINABLE OLD_PTHREAD_CREATE_JOINABLE
  54 #  else
  55 #    define PTHREAD_CREATE_JOINABLE 0 /* Panic?  No, guess. */
  56 #  endif
  57 #endif
  58
  59 #ifdef I_MACH_CTHREADS
  60
  61 /* cthreads interface */
  62
  63 /* #include <mach/cthreads.h> is in perl.h #ifdef I_MACH_CTHREADS */
  64
  65 #define MUTEX_INIT(m)                                   \
  66         STMT_START {                                    \
  67                 *m = mutex_alloc();                     \
  68                 if (*m) {                               \
  69                         mutex_init(*m);                 \
  70                 } else {                                \
  71                         Perl_croak(aTHX_ "panic: MUTEX_INIT");  \
  72                 }                                       \
  73         } STMT_END
  74
  75 #define MUTEX_LOCK(m)           mutex_lock(*m)
  76 #define MUTEX_UNLOCK(m)         mutex_unlock(*m)
  77 #define MUTEX_DESTROY(m)                                \
  78         STMT_START {                                    \
  79                 mutex_free(*m);                         \
  80                 *m = 0;                                 \
  81         } STMT_END
  82
  83 #define COND_INIT(c)                                    \
  84         STMT_START {                                    \
  85                 *c = condition_alloc();                 \
  86                 if (*c) {                               \
  87                         condition_init(*c);             \
  88                 } else {                                \
  89                         Perl_croak(aTHX_ "panic: COND_INIT");   \
  90                 }                                       \
  91         } STMT_END
  92
  93 #define COND_SIGNAL(c)          condition_signal(*c)
  94 #define COND_BROADCAST(c)       condition_broadcast(*c)
  95 #define COND_WAIT(c, m)         condition_wait(*c, *m)
  96 #define COND_DESTROY(c)                         \
  97         STMT_START {                            \
  98                 condition_free(*c);             \
  99                 *c = 0;                         \
 100         } STMT_END
 101
 102 #define THREAD_CREATE(thr, f)   (thr->self = cthread_fork(f, thr), 0)
 103 #define THREAD_POST_CREATE(thr)
 104
 105 #define THREAD_RET_TYPE         any_t
 106 #define THREAD_RET_CAST(x)      ((any_t) x)
 107
 108 #define DETACH(t)               cthread_detach(t->self)
 109 #define JOIN(t, avp)            (*(avp) = (AV *)cthread_join(t->self))
 110
 111 #define SET_THR(thr)            cthread_set_data(cthread_self(), thr)
 112 #define THR                     cthread_data(cthread_self())
 113
 114 #define INIT_THREADS            cthread_init()
 115 #define YIELD                   cthread_yield()
 116 #define ALLOC_THREAD_KEY
 117 #define SET_THREAD_SELF(thr)    (thr->self = cthread_self())
 118
 119 #endif /* I_MACH_CTHREADS */
 120
 121 #ifndef YIELD
 122 #  ifdef SCHED_YIELD
 123 #    define YIELD SCHED_YIELD
 124 #  else
 125 #    ifdef HAS_SCHED_YIELD
 126 #      define YIELD sched_yield()
 127 #    else
 128 #      ifdef HAS_PTHREAD_YIELD
 129     /* pthread_yield(NULL) platforms are expected
 130      * to have #defined YIELD for themselves. */
 131 #        define YIELD pthread_yield()
 132 #      endif
 133 #    endif
 134 #  endif
 135 #endif
 136
 137 #ifdef __hpux
 138 #  define MUTEX_INIT_NEEDS_MUTEX_ZEROED
 139 #endif
 140
 141 #ifndef MUTEX_INIT
 142 #ifdef MUTEX_INIT_NEEDS_MUTEX_ZEROED
 143     /* Temporary workaround, true bug is deeper. --jhi 1999-02-25 */
 144 #define MUTEX_INIT(m)                                           \
 145     STMT_START {                                                \
 146         Zero((m), 1, perl_mutex);                               \
 147         if (pthread_mutex_init((m), pthread_mutexattr_default)) \
 148             Perl_croak(aTHX_ "panic: MUTEX_INIT");                              \
 149     } STMT_END
 150 #else
 151 #define MUTEX_INIT(m)                                           \
 152     STMT_START {                                                \
 153         if (pthread_mutex_init((m), pthread_mutexattr_default)) \
 154             Perl_croak(aTHX_ "panic: MUTEX_INIT");                              \
 155     } STMT_END
 156 #endif
 157 #define MUTEX_LOCK(m)                           \
 158     STMT_START {                                \
 159         if (pthread_mutex_lock((m)))            \
 160             Perl_croak(aTHX_ "panic: MUTEX_LOCK");              \
 161     } STMT_END
 162 #define MUTEX_UNLOCK(m)                         \
 163     STMT_START {                                \
 164         if (pthread_mutex_unlock((m)))          \
 165             Perl_croak(aTHX_ "panic: MUTEX_UNLOCK");    \
 166     } STMT_END
 167 #define MUTEX_LOCK_NOCONTEXT(m)                         \
 168     STMT_START {                                        \
 169         if (pthread_mutex_lock((m)))                    \
 170             Perl_croak_nocontext("panic: MUTEX_LOCK");  \
 171     } STMT_END
 172 #define MUTEX_UNLOCK_NOCONTEXT(m)                       \
 173     STMT_START {                                        \
 174         if (pthread_mutex_unlock((m)))                  \
 175             Perl_croak_nocontext("panic: MUTEX_UNLOCK");\
 176     } STMT_END
 177 #define MUTEX_DESTROY(m)                        \
 178     STMT_START {                                \
 179         if (pthread_mutex_destroy((m)))         \
 180             Perl_croak(aTHX_ "panic: MUTEX_DESTROY");   \
 181     } STMT_END
 182 #endif /* MUTEX_INIT */
 183
 184 #ifndef COND_INIT
 185 #define COND_INIT(c)                                            \
 186     STMT_START {                                                \
 187         if (pthread_cond_init((c), pthread_condattr_default))   \
 188             Perl_croak(aTHX_ "panic: COND_INIT");                               \
 189     } STMT_END
 190 #define COND_SIGNAL(c)                          \
 191     STMT_START {                                \
 192         if (pthread_cond_signal((c)))           \
 193             Perl_croak(aTHX_ "panic: COND_SIGNAL");     \
 194     } STMT_END
 195 #define COND_BROADCAST(c)                       \
 196     STMT_START {                                \
 197         if (pthread_cond_broadcast((c)))        \
 198             Perl_croak(aTHX_ "panic: COND_BROADCAST");  \
 199     } STMT_END
 200 #define COND_WAIT(c, m)                         \
 201     STMT_START {                                \
 202         if (pthread_cond_wait((c), (m)))        \
 203             Perl_croak(aTHX_ "panic: COND_WAIT");               \
 204     } STMT_END
 205 #define COND_DESTROY(c)                         \
 206     STMT_START {                                \
 207         if (pthread_cond_destroy((c)))          \
 208             Perl_croak(aTHX_ "panic: COND_DESTROY");    \
 209     } STMT_END
 210 #endif /* COND_INIT */
 211
 212 /* DETACH(t) must only be called while holding t->mutex */
 213 #ifndef DETACH
 214 #define DETACH(t)                               \
 215     STMT_START {                                \
 216         if (pthread_detach((t)->self)) {        \
 217             MUTEX_UNLOCK(&(t)->mutex);          \
 218             Perl_croak(aTHX_ "panic: DETACH");          \
 219         }                                       \
 220     } STMT_END
 221 #endif /* DETACH */
 222
 223 #ifndef JOIN
 224 #define JOIN(t, avp)                                    \
 225     STMT_START {                                        \
 226         if (pthread_join((t)->self, (void**)(avp)))     \
 227             Perl_croak(aTHX_ "panic: pthread_join");            \
 228     } STMT_END
 229 #endif /* JOIN */
 230
 231 #ifndef SET_THR
 232 #define SET_THR(t)                                      \
 233     STMT_START {                                        \
 234         if (pthread_setspecific(PL_thr_key, (void *) (t)))      \
 235             Perl_croak(aTHX_ "panic: pthread_setspecific");     \
 236     } STMT_END
 237 #endif /* SET_THR */
 238
 239 #ifndef THR
 240 #define THR ((struct perl_thread *) pthread_getspecific(PL_thr_key))
 241 #endif
 242
 243 /*
 244  * dTHR is performance-critical. Here, we only do the pthread_get_specific
 245  * if there may be more than one thread in existence, otherwise we get thr
 246  * from thrsv which is cached in the per-interpreter structure.
 247  * Systems with very fast pthread_get_specific (which should be all systems
 248  * but unfortunately isn't) may wish to simplify to "...*thr = THR".
 249  *
 250  * The use of PL_threadnum should be safe here.
 251  */
 252 #ifndef dTHR
 253 #  define dTHR \
 254     struct perl_thread *thr = PL_threadnum? THR : (struct perl_thread*)SvPVX(PL_thrsv)
 255 #endif /* dTHR */
 256
 257 #ifndef INIT_THREADS
 258 #  ifdef NEED_PTHREAD_INIT
 259 #    define INIT_THREADS pthread_init()
 260 #  else
 261 #    define INIT_THREADS NOOP
 262 #  endif
 263 #endif
 264
 265 /* Accessor for per-thread SVs */
 266 #define THREADSV(i) (thr->threadsvp[i])
 267
 268 /*
 269  * LOCK_SV_MUTEX and UNLOCK_SV_MUTEX are performance-critical. Here, we
 270  * try only locking them if there may be more than one thread in existence.
 271  * Systems with very fast mutexes (and/or slow conditionals) may wish to
 272  * remove the "if (threadnum) ..." test.
 273  * XXX do NOT use C<if (PL_threadnum) ...> -- it sets up race conditions!
 274  */
 275 #define LOCK_SV_MUTEX                           \
 276     STMT_START {                                \
 277         MUTEX_LOCK(&PL_sv_mutex);               \
 278     } STMT_END
 279
 280 #define UNLOCK_SV_MUTEX                         \
 281     STMT_START {                                \
 282         MUTEX_UNLOCK(&PL_sv_mutex);             \
 283     } STMT_END
 284
 285 /* Likewise for strtab_mutex */
 286 #define LOCK_STRTAB_MUTEX                       \
 287     STMT_START {                                \
 288         MUTEX_LOCK(&PL_strtab_mutex);           \
 289     } STMT_END
 290
 291 #define UNLOCK_STRTAB_MUTEX                     \
 292     STMT_START {                                \
 293         MUTEX_UNLOCK(&PL_strtab_mutex);         \
 294     } STMT_END
 295
 296 #ifndef THREAD_RET_TYPE
 297 #  define THREAD_RET_TYPE       void *
 298 #  define THREAD_RET_CAST(p)    ((void *)(p))
 299 #endif /* THREAD_RET */
 300
 301
 302 /* Values and macros for thr->flags */
 303 #define THRf_STATE_MASK 7
 304 #define THRf_R_JOINABLE 0
 305 #define THRf_R_JOINED   1
 306 #define THRf_R_DETACHED 2
 307 #define THRf_ZOMBIE     3
 308 #define THRf_DEAD       4
 309
 310 #define THRf_DID_DIE    8
 311
 312 /* ThrSTATE(t) and ThrSETSTATE(t) must only be called while holding t->mutex */
 313 #define ThrSTATE(t) ((t)->flags & THRf_STATE_MASK)
 314 #define ThrSETSTATE(t, s) STMT_START {          \
 315         (t)->flags &= ~THRf_STATE_MASK;         \
 316         (t)->flags |= (s);                      \
 317         DEBUG_S(PerlIO_printf(PerlIO_stderr(),  \
 318                               "thread %p set to state %d\n", (t), (s))); \
 319     } STMT_END
 320
 321 typedef struct condpair {
 322     perl_mutex  mutex;          /* Protects all other fields */
 323     perl_cond   owner_cond;     /* For when owner changes at all */
 324     perl_cond   cond;           /* For cond_signal and cond_broadcast */
 325     Thread      owner;          /* Currently owning thread */
 326 } condpair_t;
 327
 328 #define MgMUTEXP(mg) (&((condpair_t *)(mg->mg_ptr))->mutex)
 329 #define MgOWNERCONDP(mg) (&((condpair_t *)(mg->mg_ptr))->owner_cond)
 330 #define MgCONDP(mg) (&((condpair_t *)(mg->mg_ptr))->cond)
 331 #define MgOWNER(mg) ((condpair_t *)(mg->mg_ptr))->owner
 332
 333 #else
 334 /* USE_THREADS is not defined */
 335 #define MUTEX_LOCK(m)
 336 #define MUTEX_LOCK_NOCONTEXT(m)
 337 #define MUTEX_UNLOCK(m)
 338 #define MUTEX_UNLOCK_NOCONTEXT(m)
 339 #define MUTEX_INIT(m)
 340 #define MUTEX_DESTROY(m)
 341 #define COND_INIT(c)
 342 #define COND_SIGNAL(c)
 343 #define COND_BROADCAST(c)
 344 #define COND_WAIT(c, m)
 345 #define COND_DESTROY(c)
 346 #define LOCK_SV_MUTEX
 347 #define UNLOCK_SV_MUTEX
 348 #define LOCK_STRTAB_MUTEX
 349 #define UNLOCK_STRTAB_MUTEX
 350
 351 #define THR
 352 #define dTHR dNOOP
 353 #endif /* USE_THREADS */