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perl5.git.perl.org Git - perl5.git/blob - 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 */
11 #if defined(USE_ITHREADS)
13 #if defined(VMS)
14 #include <builtins.h>
15 #endif
17 #ifdef WIN32
18 # include <win32thread.h>
19 #elif defined(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
33 # define PERL_GET_CONTEXT Perl_get_context()
34 # define PERL_SET_CONTEXT(t) Perl_set_context((void*)t)
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 OEMVS
43 # define pthread_addr_t void *
44 # define pthread_create(t,a,s,d) pthread_create(t,&(a),s,d)
45 # define pthread_keycreate pthread_key_create
46 # endif
47 # ifdef VMS
48 # define pthread_attr_init(a) pthread_attr_create(a)
49 # define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_setdetach_np(a,s)
50 # define PTHREAD_CREATE(t,a,s,d) pthread_create(t,a,s,d)
51 # define pthread_key_create(k,d) pthread_keycreate(k,(pthread_destructor_t)(d))
52 # define pthread_mutexattr_init(a) pthread_mutexattr_create(a)
53 # define pthread_mutexattr_settype(a,t) pthread_mutexattr_setkind_np(a,t)
54 # endif
55 # if defined(__hpux) && defined(__ux_version) && __ux_version <= 1020
56 # define pthread_attr_init(a) pthread_attr_create(a)
57 /* XXX pthread_setdetach_np() missing in DCE threads on HP-UX 10.20 */
58 # define PTHREAD_ATTR_SETDETACHSTATE(a,s) (0)
59 # define PTHREAD_CREATE(t,a,s,d) pthread_create(t,a,s,d)
60 # define pthread_key_create(k,d) pthread_keycreate(k,(pthread_destructor_t)(d))
61 # define pthread_mutexattr_init(a) pthread_mutexattr_create(a)
62 # define pthread_mutexattr_settype(a,t) pthread_mutexattr_setkind_np(a,t)
63 # endif
64 # if defined(DJGPP) || defined(OEMVS)
65 # define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,&(s))
66 # define YIELD pthread_yield(NULL)
67 # endif
68 # endif
69 # if !defined(__hpux) || !defined(__ux_version) || __ux_version > 1020
70 # define pthread_mutexattr_default NULL
71 # define pthread_condattr_default NULL
72 # endif
73 #endif
75 #ifndef PTHREAD_CREATE
76 /* You are not supposed to pass NULL as the 2nd arg of PTHREAD_CREATE(). */
77 # define PTHREAD_CREATE(t,a,s,d) pthread_create(t,&(a),s,d)
78 #endif
80 #ifndef PTHREAD_ATTR_SETDETACHSTATE
81 # define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,s)
82 #endif
84 #ifndef PTHREAD_CREATE_JOINABLE
85 # ifdef OLD_PTHREAD_CREATE_JOINABLE
86 # define PTHREAD_CREATE_JOINABLE OLD_PTHREAD_CREATE_JOINABLE
87 # else
88 # define PTHREAD_CREATE_JOINABLE 0 /* Panic? No, guess. */
89 # endif
90 #endif
92 #ifdef __VMS
93 /* Default is 1024 on VAX, 8192 otherwise */
94 # ifdef __ia64
95 # define THREAD_CREATE_NEEDS_STACK (48*1024)
96 # else
97 # define THREAD_CREATE_NEEDS_STACK (32*1024)
98 # endif
99 #endif
101 #ifdef I_MACH_CTHREADS
103 /* cthreads interface */
105 /* #include <mach/cthreads.h> is in perl.h #ifdef I_MACH_CTHREADS */
107 #define MUTEX_INIT(m) \
108 STMT_START { \
109 *m = mutex_alloc(); \
110 if (*m) { \
111 mutex_init(*m); \
112 } else { \
113 Perl_croak_nocontext("panic: MUTEX_INIT [%s:%d]", \
114 __FILE__, __LINE__); \
115 } \
116 } STMT_END
118 #define MUTEX_LOCK(m) mutex_lock(*m)
119 #define MUTEX_UNLOCK(m) mutex_unlock(*m)
120 #define MUTEX_DESTROY(m) \
121 STMT_START { \
122 mutex_free(*m); \
123 *m = 0; \
124 } STMT_END
126 #define COND_INIT(c) \
127 STMT_START { \
128 *c = condition_alloc(); \
129 if (*c) { \
130 condition_init(*c); \
131 } \
132 else { \
133 Perl_croak_nocontext("panic: COND_INIT [%s:%d]", \
134 __FILE__, __LINE__); \
135 } \
136 } STMT_END
138 #define COND_SIGNAL(c) condition_signal(*c)
139 #define COND_BROADCAST(c) condition_broadcast(*c)
140 #define COND_WAIT(c, m) condition_wait(*c, *m)
141 #define COND_DESTROY(c) \
142 STMT_START { \
143 condition_free(*c); \
144 *c = 0; \
145 } STMT_END
147 #define THREAD_RET_TYPE any_t
149 #define DETACH(t) cthread_detach(t->self)
150 #define JOIN(t, avp) (*(avp) = MUTABLE_AV(cthread_join(t->self)))
152 #define PERL_SET_CONTEXT(t) cthread_set_data(cthread_self(), t)
153 #define PERL_GET_CONTEXT cthread_data(cthread_self())
155 #define INIT_THREADS cthread_init()
156 #define YIELD cthread_yield()
157 #define ALLOC_THREAD_KEY NOOP
158 #define FREE_THREAD_KEY NOOP
159 #define SET_THREAD_SELF(thr) (thr->self = cthread_self())
161 #endif /* I_MACH_CTHREADS */
163 #ifndef YIELD
164 # ifdef SCHED_YIELD
165 # define YIELD SCHED_YIELD
166 # elif defined(HAS_SCHED_YIELD)
167 # define YIELD sched_yield()
168 # elif defined(HAS_PTHREAD_YIELD)
169 /* pthread_yield(NULL) platforms are expected
170 * to have #defined YIELD for themselves. */
171 # define YIELD pthread_yield()
172 # endif
173 #endif
175 #ifdef __hpux
176 # define MUTEX_INIT_NEEDS_MUTEX_ZEROED
177 #endif
179 #ifndef MUTEX_INIT
181 # ifdef MUTEX_INIT_NEEDS_MUTEX_ZEROED
182 /* Temporary workaround, true bug is deeper. --jhi 1999-02-25 */
183 # define MUTEX_INIT(m) \
184 STMT_START { \
185 int _eC_; \
186 Zero((m), 1, perl_mutex); \
187 if ((_eC_ = pthread_mutex_init((m), pthread_mutexattr_default))) \
188 Perl_croak_nocontext("panic: MUTEX_INIT (%d) [%s:%d]", \
189 _eC_, __FILE__, __LINE__); \
190 } STMT_END
191 # else
192 # define MUTEX_INIT(m) \
193 STMT_START { \
194 int _eC_; \
195 if ((_eC_ = pthread_mutex_init((m), pthread_mutexattr_default))) \
196 Perl_croak_nocontext("panic: MUTEX_INIT (%d) [%s:%d]", \
197 _eC_, __FILE__, __LINE__); \
198 } STMT_END
199 # endif
201 # ifdef PERL_TSA_ACTIVE
202 # define perl_pthread_mutex_lock(m) perl_tsa_mutex_lock(m)
203 # define perl_pthread_mutex_unlock(m) perl_tsa_mutex_unlock(m)
204 # else
205 # define perl_pthread_mutex_lock(m) pthread_mutex_lock(m)
206 # define perl_pthread_mutex_unlock(m) pthread_mutex_unlock(m)
207 # endif
209 # define MUTEX_LOCK(m) \
210 STMT_START { \
211 int _eC_; \
212 if ((_eC_ = perl_pthread_mutex_lock((m)))) \
213 Perl_croak_nocontext("panic: MUTEX_LOCK (%d) [%s:%d]", \
214 _eC_, __FILE__, __LINE__); \
215 } STMT_END
217 # define MUTEX_UNLOCK(m) \
218 STMT_START { \
219 int _eC_; \
220 if ((_eC_ = perl_pthread_mutex_unlock((m)))) \
221 Perl_croak_nocontext("panic: MUTEX_UNLOCK (%d) [%s:%d]", \
222 _eC_, __FILE__, __LINE__); \
223 } STMT_END
225 # define MUTEX_DESTROY(m) \
226 STMT_START { \
227 int _eC_; \
228 if ((_eC_ = pthread_mutex_destroy((m)))) \
229 Perl_croak_nocontext("panic: MUTEX_DESTROY (%d) [%s:%d]", \
230 _eC_, __FILE__, __LINE__); \
231 } STMT_END
232 #endif /* MUTEX_INIT */
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
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
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
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
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 */
276 #if defined(MUTEX_LOCK) && defined(MUTEX_UNLOCK) \
277 && defined(COND_SIGNAL) && defined(COND_WAIT)
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 */
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
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
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
324 # define PERL_WRITE_UNLOCK(mutex) \
325 STMT_START { \
326 COND_SIGNAL(&(mutex)->wakeup); \
327 MUTEX_UNLOCK(&(mutex)->lock); \
328 } STMT_END
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
337 # define PERL_RW_MUTEX_DESTROY(mutex) \
338 STMT_START { \
339 COND_DESTROY(&(mutex)->wakeup); \
340 MUTEX_DESTROY(&(mutex)->lock); \
341 } STMT_END
343 #endif
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 */
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 */
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
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
382 #ifndef PERL_GET_CONTEXT
383 # define PERL_GET_CONTEXT PTHREAD_GETSPECIFIC(PL_thr_key)
384 #endif
386 #ifndef PERL_SET_CONTEXT
387 # define PERL_SET_CONTEXT(t) \
388 STMT_START { \
389 int _eC_; \
390 if ((_eC_ = pthread_setspecific(PL_thr_key, (void *)(t)))) \
391 Perl_croak_nocontext("panic: pthread_setspecific (%d) [%s:%d]", \
392 _eC_, __FILE__, __LINE__); \
393 } STMT_END
394 #endif /* PERL_SET_CONTEXT */
396 #ifndef INIT_THREADS
397 # ifdef NEED_PTHREAD_INIT
398 # define INIT_THREADS pthread_init()
399 # endif
400 #endif
402 #ifndef ALLOC_THREAD_KEY
403 # define ALLOC_THREAD_KEY \
404 STMT_START { \
405 if (pthread_key_create(&PL_thr_key, 0)) { \
406 PERL_UNUSED_RESULT(write(2, STR_WITH_LEN("panic: pthread_key_create failed\n"))); \
407 exit(1); \
408 } \
409 } STMT_END
410 #endif
412 #ifndef FREE_THREAD_KEY
413 # define FREE_THREAD_KEY \
414 STMT_START { \
415 pthread_key_delete(PL_thr_key); \
416 } STMT_END
417 #endif
419 #ifndef PTHREAD_ATFORK
420 # ifdef HAS_PTHREAD_ATFORK
421 # define PTHREAD_ATFORK(prepare,parent,child) \
422 pthread_atfork(prepare,parent,child)
423 # else
424 # define PTHREAD_ATFORK(prepare,parent,child) \
425 NOOP
426 # endif
427 #endif
429 #ifndef THREAD_RET_TYPE
430 # define THREAD_RET_TYPE void *
431 #endif /* THREAD_RET */
433 # define LOCK_DOLLARZERO_MUTEX MUTEX_LOCK(&PL_dollarzero_mutex)
434 # define UNLOCK_DOLLARZERO_MUTEX MUTEX_UNLOCK(&PL_dollarzero_mutex)
436 #endif /* USE_ITHREADS */
438 #ifndef MUTEX_LOCK
439 # define MUTEX_LOCK(m) NOOP
440 #endif
442 #ifndef MUTEX_UNLOCK
443 # define MUTEX_UNLOCK(m) NOOP
444 #endif
446 #ifndef MUTEX_INIT
447 # define MUTEX_INIT(m) NOOP
448 #endif
450 #ifndef MUTEX_DESTROY
451 # define MUTEX_DESTROY(m) NOOP
452 #endif
454 #ifndef COND_INIT
455 # define COND_INIT(c) NOOP
456 #endif
458 #ifndef COND_SIGNAL
459 # define COND_SIGNAL(c) NOOP
460 #endif
462 #ifndef COND_BROADCAST
463 # define COND_BROADCAST(c) NOOP
464 #endif
466 #ifndef COND_WAIT
467 # define COND_WAIT(c, m) NOOP
468 #endif
470 #ifndef COND_DESTROY
471 # define COND_DESTROY(c) NOOP
472 #endif
474 #ifndef PERL_READ_LOCK
475 # define PERL_READ_LOCK NOOP
476 # define PERL_READ_UNLOCK NOOP
477 # define PERL_WRITE_LOCK NOOP
478 # define PERL_WRITE_UNLOCK NOOP
479 # define PERL_RW_MUTEX_INIT NOOP
480 # define PERL_RW_MUTEX_DESTROY NOOP
481 #endif
483 #ifndef LOCK_DOLLARZERO_MUTEX
484 # define LOCK_DOLLARZERO_MUTEX NOOP
485 #endif
487 #ifndef UNLOCK_DOLLARZERO_MUTEX
488 # define UNLOCK_DOLLARZERO_MUTEX NOOP
489 #endif
491 /* THR, SET_THR, and dTHR are there for compatibility with old versions */
492 #ifndef THR
493 # define THR PERL_GET_THX
494 #endif
496 #ifndef SET_THR
497 # define SET_THR(t) PERL_SET_THX(t)
498 #endif
500 #ifndef dTHR
501 # define dTHR dNOOP
502 #endif
504 #ifndef INIT_THREADS
505 # define INIT_THREADS NOOP
506 #endif
508 /*
509 * ex: set ts=8 sts=4 sw=4 et:
510 */