This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
Initial (untested) merge of all non-ansi changes on ansiperl branch
[perl5.git] / thread.h
1 #ifdef USE_THREADS
2
3 #ifdef WIN32
4 #  include <win32thread.h>
5 #else
6
7 /* POSIXish threads */
8 typedef pthread_t perl_thread;
9 #ifdef OLD_PTHREADS_API
10 #  define pthread_mutexattr_init(a) pthread_mutexattr_create(a)
11 #  define pthread_mutexattr_settype(a,t) pthread_mutexattr_setkind_np(a,t)
12 #  define pthread_key_create(k,d) pthread_keycreate(k,(pthread_destructor_t)(d))
13 #  define YIELD pthread_yield()
14 #  define DETACH(t)                             \
15     STMT_START {                                \
16         if (pthread_detach(&(t)->self)) {       \
17             MUTEX_UNLOCK(&(t)->mutex);          \
18             croak("panic: DETACH");             \
19         }                                       \
20     } STMT_END
21 #else
22 #  define pthread_mutexattr_default NULL
23 #  define pthread_condattr_default NULL
24 #  define pthread_attr_default NULL
25 #endif /* OLD_PTHREADS_API */
26 #endif
27
28 #ifndef YIELD
29 #  define YIELD sched_yield()
30 #endif
31
32 #ifndef MUTEX_INIT
33 #define MUTEX_INIT(m)                                           \
34     STMT_START {                                                \
35         if (pthread_mutex_init((m), pthread_mutexattr_default)) \
36             croak("panic: MUTEX_INIT");                         \
37     } STMT_END
38 #define MUTEX_LOCK(m)                           \
39     STMT_START {                                \
40         if (pthread_mutex_lock((m)))            \
41             croak("panic: MUTEX_LOCK");         \
42     } STMT_END
43 #define MUTEX_UNLOCK(m)                         \
44     STMT_START {                                \
45         if (pthread_mutex_unlock((m)))          \
46             croak("panic: MUTEX_UNLOCK");       \
47     } STMT_END
48 #define MUTEX_DESTROY(m)                        \
49     STMT_START {                                \
50         if (pthread_mutex_destroy((m)))         \
51             croak("panic: MUTEX_DESTROY");      \
52     } STMT_END
53 #endif /* MUTEX_INIT */
54
55 #ifndef COND_INIT
56 #define COND_INIT(c)                                            \
57     STMT_START {                                                \
58         if (pthread_cond_init((c), pthread_condattr_default))   \
59             croak("panic: COND_INIT");                          \
60     } STMT_END
61 #define COND_SIGNAL(c)                          \
62     STMT_START {                                \
63         if (pthread_cond_signal((c)))           \
64             croak("panic: COND_SIGNAL");        \
65     } STMT_END
66 #define COND_BROADCAST(c)                       \
67     STMT_START {                                \
68         if (pthread_cond_broadcast((c)))        \
69             croak("panic: COND_BROADCAST");     \
70     } STMT_END
71 #define COND_WAIT(c, m)                         \
72     STMT_START {                                \
73         if (pthread_cond_wait((c), (m)))        \
74             croak("panic: COND_WAIT");          \
75     } STMT_END
76 #define COND_DESTROY(c)                         \
77     STMT_START {                                \
78         if (pthread_cond_destroy((c)))          \
79             croak("panic: COND_DESTROY");       \
80     } STMT_END
81 #endif /* COND_INIT */
82
83 /* DETACH(t) must only be called while holding t->mutex */
84 #ifndef DETACH
85 #define DETACH(t)                               \
86     STMT_START {                                \
87         if (pthread_detach((t)->self)) {        \
88             MUTEX_UNLOCK(&(t)->mutex);          \
89             croak("panic: DETACH");             \
90         }                                       \
91     } STMT_END
92 #endif /* DETACH */
93
94 #ifndef JOIN
95 #define JOIN(t, avp)                                    \
96     STMT_START {                                        \
97         if (pthread_join((t)->self, (void**)(avp)))     \
98             croak("panic: pthread_join");               \
99     } STMT_END
100 #endif /* JOIN */
101
102 #ifndef SET_THR
103 #define SET_THR(t)                                      \
104     STMT_START {                                        \
105         if (pthread_setspecific(thr_key, (void *) (t))) \
106             croak("panic: pthread_setspecific");        \
107     } STMT_END
108 #endif /* SET_THR */
109
110 #ifndef THR
111 #  ifdef OLD_PTHREADS_API
112 struct thread *getTHR _((void));
113 #    define THR getTHR()
114 #  else
115 #    define THR ((struct thread *) pthread_getspecific(thr_key))
116 #  endif /* OLD_PTHREADS_API */
117 #endif /* THR */
118
119 #ifndef dTHR
120 #  define dTHR struct thread *thr = THR
121 #endif /* dTHR */
122
123 #ifndef INIT_THREADS
124 #  ifdef NEED_PTHREAD_INIT
125 #    define INIT_THREADS pthread_init()
126 #  else
127 #    define INIT_THREADS NOOP
128 #  endif
129 #endif
130
131
132 #ifndef THREAD_RET_TYPE
133 #  define THREAD_RET_TYPE       void *
134 #  define THREAD_RET_CAST(p)    ((void *)(p))
135 #endif /* THREAD_RET */
136
137 struct thread {
138     /* The fields that used to be global */
139     /* Important ones in the first cache line (if alignment is done right) */
140     SV **       Tstack_sp;
141 #ifdef OP_IN_REGISTER
142     OP *        Topsave;
143 #else
144     OP *        Top;
145 #endif
146     SV **       Tcurpad;
147     SV **       Tstack_base;
148
149     SV **       Tstack_max;
150
151     I32 *       Tscopestack;
152     I32         Tscopestack_ix;
153     I32         Tscopestack_max;
154
155     ANY *       Tsavestack;
156     I32         Tsavestack_ix;
157     I32         Tsavestack_max;
158
159     OP **       Tretstack;
160     I32         Tretstack_ix;
161     I32         Tretstack_max;
162
163     I32 *       Tmarkstack;
164     I32 *       Tmarkstack_ptr;
165     I32 *       Tmarkstack_max;
166
167     SV *        TSv;
168     XPV *       TXpv;
169     struct stat Tstatbuf;
170     struct tms  Ttimesbuf;
171     
172     /* XXX What about regexp stuff? */
173
174     /* Now the fields that used to be "per interpreter" (even when global) */
175
176     /* Fields used by magic variables such as $@, $/ and so on */
177     bool        Ttainted;
178     PMOP *      Tcurpm;
179     SV *        Tnrs;
180     SV *        Trs;
181     GV *        Tlast_in_gv;
182     char *      Tofs;
183     STRLEN      Tofslen;
184     GV *        Tdefoutgv;
185     char *      Tchopset;
186     SV *        Tformtarget;
187     SV *        Tbodytarget;
188     SV *        Ttoptarget;
189
190     /* Stashes */
191     HV *        Tdefstash;
192     HV *        Tcurstash;
193
194     /* Stacks */
195     SV **       Ttmps_stack;
196     I32         Ttmps_ix;
197     I32         Ttmps_floor;
198     I32         Ttmps_max;
199
200     int         Tin_eval;
201     OP *        Trestartop;
202     int         Tdelaymagic;
203     bool        Tdirty;
204     U8          Tlocalizing;
205     COP *       Tcurcop;
206
207     CONTEXT *   Tcxstack;
208     I32         Tcxstack_ix;
209     I32         Tcxstack_max;
210
211     AV *        Tcurstack;
212     AV *        Tmainstack;
213     JMPENV *    Ttop_env;
214     I32         Trunlevel;
215
216     /* XXX Sort stuff, firstgv, secongv and so on? */
217
218     SV *        oursv;
219     HV *        cvcache;
220     perl_thread self;                   /* Underlying thread object */
221     U32         flags;
222     AV *        magicals;               /* Per-thread magicals */
223     AV *        specific;               /* Thread-specific user data */
224     perl_mutex  mutex;                  /* For the fields others can change */
225     U32         tid;
226     struct thread *next, *prev;         /* Circular linked list of threads */
227     JMPENV      Tstart_env;             /* Top of top_env longjmp() chain */ 
228 #ifdef ADD_THREAD_INTERN
229     struct thread_intern i;             /* Platform-dependent internals */
230 #endif
231     char        trailing_nul;           /* For the sake of thrsv and oursv */
232 };
233
234 typedef struct thread *Thread;
235
236 /* Values and macros for thr->flags */
237 #define THRf_STATE_MASK 7
238 #define THRf_R_JOINABLE 0
239 #define THRf_R_JOINED   1
240 #define THRf_R_DETACHED 2
241 #define THRf_ZOMBIE     3
242 #define THRf_DEAD       4
243
244 #define THRf_DIE_FATAL  8
245
246 /* ThrSTATE(t) and ThrSETSTATE(t) must only be called while holding t->mutex */
247 #define ThrSTATE(t) ((t)->flags)
248 #define ThrSETSTATE(t, s) STMT_START {          \
249         (t)->flags &= ~THRf_STATE_MASK;         \
250         (t)->flags |= (s);                      \
251         DEBUG_L(PerlIO_printf(PerlIO_stderr(),  \
252                               "thread %p set to state %d\n", (t), (s))); \
253     } STMT_END
254
255 typedef struct condpair {
256     perl_mutex  mutex;          /* Protects all other fields */
257     perl_cond   owner_cond;     /* For when owner changes at all */
258     perl_cond   cond;           /* For cond_signal and cond_broadcast */
259     Thread      owner;          /* Currently owning thread */
260 } condpair_t;
261
262 #define MgMUTEXP(mg) (&((condpair_t *)(mg->mg_ptr))->mutex)
263 #define MgOWNERCONDP(mg) (&((condpair_t *)(mg->mg_ptr))->owner_cond)
264 #define MgCONDP(mg) (&((condpair_t *)(mg->mg_ptr))->cond)
265 #define MgOWNER(mg) ((condpair_t *)(mg->mg_ptr))->owner
266
267 #undef  stack_base
268 #undef  stack_sp
269 #undef  stack_max
270 #undef  curstack
271 #undef  mainstack
272 #undef  markstack
273 #undef  markstack_ptr
274 #undef  markstack_max
275 #undef  scopestack
276 #undef  scopestack_ix
277 #undef  scopestack_max
278 #undef  savestack
279 #undef  savestack_ix
280 #undef  savestack_max
281 #undef  retstack
282 #undef  retstack_ix
283 #undef  retstack_max
284 #undef  curcop
285 #undef  cxstack
286 #undef  cxstack_ix
287 #undef  cxstack_max
288 #undef  defstash
289 #undef  curstash
290 #undef  tmps_stack
291 #undef  tmps_floor
292 #undef  tmps_ix
293 #undef  tmps_max
294 #undef  curpad
295 #undef  Sv
296 #undef  Xpv
297 #undef  statbuf
298 #undef  timesbuf
299 #undef  tainted
300 #undef  curpm
301 #undef  nrs
302 #undef  rs
303 #undef  last_in_gv
304 #undef  ofs
305 #undef  ofslen
306 #undef  defoutgv
307 #undef  chopset
308 #undef  formtarget
309 #undef  bodytarget
310 #undef  start_env
311 #undef  toptarget
312 #undef  top_env
313 #undef  runlevel
314 #undef  in_eval
315 #undef  restartop
316 #undef  delaymagic
317 #undef  dirty
318 #undef  localizing
319
320 #define stack_base      (thr->Tstack_base)
321 #define stack_sp        (thr->Tstack_sp)
322 #define stack_max       (thr->Tstack_max)
323 #ifdef OP_IN_REGISTER
324 #define opsave          (thr->Topsave)
325 #else
326 #undef  op
327 #define op              (thr->Top)
328 #endif
329 #define curcop          (thr->Tcurcop)
330 #define stack           (thr->Tstack)
331 #define curstack        (thr->Tcurstack)
332 #define mainstack       (thr->Tmainstack)
333 #define markstack       (thr->Tmarkstack)
334 #define markstack_ptr   (thr->Tmarkstack_ptr)
335 #define markstack_max   (thr->Tmarkstack_max)
336 #define scopestack      (thr->Tscopestack)
337 #define scopestack_ix   (thr->Tscopestack_ix)
338 #define scopestack_max  (thr->Tscopestack_max)
339
340 #define savestack       (thr->Tsavestack)
341 #define savestack_ix    (thr->Tsavestack_ix)
342 #define savestack_max   (thr->Tsavestack_max)
343
344 #define retstack        (thr->Tretstack)
345 #define retstack_ix     (thr->Tretstack_ix)
346 #define retstack_max    (thr->Tretstack_max)
347
348 #define cxstack         (thr->Tcxstack)
349 #define cxstack_ix      (thr->Tcxstack_ix)
350 #define cxstack_max     (thr->Tcxstack_max)
351
352 #define curpad          (thr->Tcurpad)
353 #define Sv              (thr->TSv)
354 #define Xpv             (thr->TXpv)
355 #define statbuf         (thr->Tstatbuf)
356 #define timesbuf        (thr->Ttimesbuf)
357 #define tainted         (thr->Ttainted)
358 #define tainted         (thr->Ttainted)
359 #define curpm           (thr->Tcurpm)
360 #define nrs             (thr->Tnrs)
361 #define rs              (thr->Trs)
362 #define last_in_gv      (thr->Tlast_in_gv)
363 #define ofs             (thr->Tofs)
364 #define ofslen          (thr->Tofslen)
365 #define defoutgv        (thr->Tdefoutgv)
366 #define chopset         (thr->Tchopset)
367 #define formtarget      (thr->Tformtarget)
368 #define bodytarget      (thr->Tbodytarget)
369 #define toptarget       (thr->Ttoptarget)
370 #define defstash        (thr->Tdefstash)
371 #define curstash        (thr->Tcurstash)
372
373 #define tmps_stack      (thr->Ttmps_stack)
374 #define tmps_ix         (thr->Ttmps_ix)
375 #define tmps_floor      (thr->Ttmps_floor)
376 #define tmps_max        (thr->Ttmps_max)
377
378 #define in_eval         (thr->Tin_eval)
379 #define restartop       (thr->Trestartop)
380 #define delaymagic      (thr->Tdelaymagic)
381 #define dirty           (thr->Tdirty)
382 #define localizing      (thr->Tlocalizing)
383
384 #define top_env         (thr->Ttop_env)
385 #define runlevel        (thr->Trunlevel)
386 #define start_env       (thr->Tstart_env)
387
388 #else
389 /* USE_THREADS is not defined */
390 #define MUTEX_LOCK(m)
391 #define MUTEX_UNLOCK(m)
392 #define MUTEX_INIT(m)
393 #define MUTEX_DESTROY(m)
394 #define COND_INIT(c)
395 #define COND_SIGNAL(c)
396 #define COND_BROADCAST(c)
397 #define COND_WAIT(c, m)
398 #define COND_DESTROY(c)
399
400 #define THR
401 /* Rats: if dTHR is just blank then the subsequent ";" throws an error */
402 #define dTHR extern int errno
403 #endif /* USE_THREADS */