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3e4fc359 | 1 | /* Copyright (C) 2002, 2003 Free Software Foundation, Inc. |
76a50749 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
19 | ||
20 | #include <errno.h> | |
21 | #include <stdbool.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include "pthreadP.h" | |
25 | #include <hp-timing.h> | |
26 | #include <ldsodefs.h> | |
3e4fc359 | 27 | #include <atomic.h> |
12d7ca07 | 28 | #include <libc-internal.h> |
76a50749 UD |
29 | |
30 | #include <shlib-compat.h> | |
31 | ||
32 | ||
33 | /* Local function to start thread and handle cleanup. */ | |
34 | static int start_thread (void *arg); | |
35 | /* Similar version used when debugging. */ | |
36 | static int start_thread_debug (void *arg); | |
37 | ||
38 | ||
39 | /* Nozero if debugging mode is enabled. */ | |
40 | int __pthread_debug; | |
41 | ||
42 | /* Globally enabled events. */ | |
fa9a4ff0 | 43 | static td_thr_events_t __nptl_threads_events; |
76a50749 UD |
44 | |
45 | /* Pointer to descriptor with the last event. */ | |
fa9a4ff0 | 46 | static struct pthread *__nptl_last_event; |
76a50749 | 47 | |
47202270 UD |
48 | /* Number of threads running. */ |
49 | unsigned int __nptl_nthreads = 1; | |
50 | ||
76a50749 UD |
51 | |
52 | /* Code to allocate and deallocate a stack. */ | |
76a50749 UD |
53 | #include "allocatestack.c" |
54 | ||
55 | /* Code to create the thread. */ | |
56 | #include "createthread.c" | |
57 | ||
58 | ||
59 | /* Table of the key information. */ | |
fa9a4ff0 | 60 | struct pthread_key_struct __pthread_keys[PTHREAD_KEYS_MAX] |
518b5308 | 61 | __attribute__ ((nocommon)); |
415ef7d8 | 62 | hidden_data_def (__pthread_keys) |
76a50749 | 63 | |
fa9a4ff0 RM |
64 | /* This is for libthread_db only. */ |
65 | const int __pthread_pthread_sizeof_descr = sizeof (struct pthread); | |
76a50749 UD |
66 | |
67 | struct pthread * | |
90491dc4 | 68 | internal_function |
76a50749 UD |
69 | __find_in_stack_list (pd) |
70 | struct pthread *pd; | |
71 | { | |
72 | list_t *entry; | |
73 | struct pthread *result = NULL; | |
74 | ||
75 | lll_lock (stack_cache_lock); | |
76 | ||
77 | list_for_each (entry, &stack_used) | |
78 | { | |
79 | struct pthread *curp; | |
80 | ||
d4f64e1a | 81 | curp = list_entry (entry, struct pthread, list); |
76a50749 UD |
82 | if (curp == pd) |
83 | { | |
84 | result = curp; | |
85 | break; | |
86 | } | |
87 | } | |
88 | ||
89 | if (result == NULL) | |
90 | list_for_each (entry, &__stack_user) | |
91 | { | |
92 | struct pthread *curp; | |
93 | ||
d4f64e1a | 94 | curp = list_entry (entry, struct pthread, list); |
76a50749 UD |
95 | if (curp == pd) |
96 | { | |
97 | result = curp; | |
98 | break; | |
99 | } | |
100 | } | |
101 | ||
102 | lll_unlock (stack_cache_lock); | |
103 | ||
104 | return result; | |
105 | } | |
106 | ||
107 | ||
108 | /* Deallocate POSIX thread-local-storage. */ | |
109 | static void | |
ba25bb0f | 110 | internal_function |
877e51b2 | 111 | deallocate_tsd (void) |
76a50749 | 112 | { |
877e51b2 UD |
113 | struct pthread *self = THREAD_SELF; |
114 | ||
76a50749 UD |
115 | /* Maybe no data was ever allocated. This happens often so we have |
116 | a flag for this. */ | |
877e51b2 | 117 | if (THREAD_GETMEM (self, specific_used)) |
76a50749 UD |
118 | { |
119 | size_t round; | |
6b4686a5 | 120 | size_t cnt; |
76a50749 | 121 | |
6b4686a5 UD |
122 | round = 0; |
123 | do | |
76a50749 | 124 | { |
76a50749 UD |
125 | size_t idx; |
126 | ||
c5acd3d7 | 127 | /* So far no new nonzero data entry. */ |
877e51b2 | 128 | THREAD_SETMEM (self, specific_used, false); |
c5acd3d7 | 129 | |
76a50749 | 130 | for (cnt = idx = 0; cnt < PTHREAD_KEY_1STLEVEL_SIZE; ++cnt) |
6b4686a5 UD |
131 | { |
132 | struct pthread_key_data *level2; | |
133 | ||
877e51b2 | 134 | level2 = THREAD_GETMEM_NC (self, specific, cnt); |
6b4686a5 UD |
135 | |
136 | if (level2 != NULL) | |
137 | { | |
138 | size_t inner; | |
139 | ||
140 | for (inner = 0; inner < PTHREAD_KEY_2NDLEVEL_SIZE; | |
141 | ++inner, ++idx) | |
142 | { | |
143 | void *data = level2[inner].data; | |
144 | ||
877e51b2 UD |
145 | if (data != NULL) |
146 | { | |
147 | /* Always clear the data. */ | |
148 | level2[inner].data = NULL; | |
149 | ||
6b4686a5 UD |
150 | /* Make sure the data corresponds to a valid |
151 | key. This test fails if the key was | |
152 | deallocated and also if it was | |
153 | re-allocated. It is the user's | |
154 | responsibility to free the memory in this | |
155 | case. */ | |
877e51b2 UD |
156 | if (level2[inner].seq |
157 | == __pthread_keys[idx].seq | |
158 | /* It is not necessary to register a destructor | |
159 | function. */ | |
160 | && __pthread_keys[idx].destr != NULL) | |
161 | /* Call the user-provided destructor. */ | |
162 | __pthread_keys[idx].destr (data); | |
6b4686a5 UD |
163 | } |
164 | } | |
165 | } | |
166 | else | |
167 | idx += PTHREAD_KEY_1STLEVEL_SIZE; | |
168 | } | |
877e51b2 UD |
169 | |
170 | if (THREAD_GETMEM (self, specific_used) == 0) | |
171 | /* No data has been modified. */ | |
172 | goto just_free; | |
76a50749 | 173 | } |
877e51b2 UD |
174 | /* We only repeat the process a fixed number of times. */ |
175 | while (__builtin_expect (++round < PTHREAD_DESTRUCTOR_ITERATIONS, 0)); | |
76a50749 | 176 | |
877e51b2 UD |
177 | /* Just clear the memory of the first block for reuse. */ |
178 | memset (&THREAD_SELF->specific_1stblock, '\0', | |
179 | sizeof (self->specific_1stblock)); | |
6b4686a5 | 180 | |
877e51b2 | 181 | just_free: |
6b4686a5 UD |
182 | /* Free the memory for the other blocks. */ |
183 | for (cnt = 1; cnt < PTHREAD_KEY_1STLEVEL_SIZE; ++cnt) | |
184 | { | |
185 | struct pthread_key_data *level2; | |
186 | ||
877e51b2 | 187 | level2 = THREAD_GETMEM_NC (self, specific, cnt); |
6b4686a5 UD |
188 | if (level2 != NULL) |
189 | { | |
190 | /* The first block is allocated as part of the thread | |
191 | descriptor. */ | |
192 | free (level2); | |
877e51b2 | 193 | THREAD_SETMEM_NC (self, specific, cnt, NULL); |
6b4686a5 UD |
194 | } |
195 | } | |
196 | ||
877e51b2 | 197 | THREAD_SETMEM (self, specific_used, false); |
76a50749 UD |
198 | } |
199 | } | |
200 | ||
201 | ||
202 | /* Deallocate a thread's stack after optionally making sure the thread | |
203 | descriptor is still valid. */ | |
204 | void | |
90491dc4 | 205 | internal_function |
76a50749 UD |
206 | __free_tcb (struct pthread *pd) |
207 | { | |
208 | /* The thread is exiting now. */ | |
ba25bb0f UD |
209 | if (__builtin_expect (atomic_bit_test_set (&pd->cancelhandling, |
210 | TERMINATED_BIT) == 0, 1)) | |
76a50749 UD |
211 | { |
212 | /* Remove the descriptor from the list. */ | |
213 | if (DEBUGGING_P && __find_in_stack_list (pd) == NULL) | |
214 | /* Something is really wrong. The descriptor for a still | |
215 | running thread is gone. */ | |
216 | abort (); | |
217 | ||
76a50749 UD |
218 | /* Queue the stack memory block for reuse and exit the process. The |
219 | kernel will signal via writing to the address returned by | |
220 | QUEUE-STACK when the stack is available. */ | |
221 | __deallocate_stack (pd); | |
222 | } | |
223 | } | |
224 | ||
225 | ||
226 | static int | |
227 | start_thread (void *arg) | |
228 | { | |
47202270 UD |
229 | /* One more thread. */ |
230 | atomic_increment (&__nptl_nthreads); | |
231 | ||
76a50749 UD |
232 | struct pthread *pd = (struct pthread *) arg; |
233 | ||
234 | #if HP_TIMING_AVAIL | |
235 | /* Remember the time when the thread was started. */ | |
236 | hp_timing_t now; | |
237 | HP_TIMING_NOW (now); | |
238 | THREAD_SETMEM (pd, cpuclock_offset, now); | |
239 | #endif | |
240 | ||
241 | /* This is where the try/finally block should be created. For | |
242 | compilers without that support we do use setjmp. */ | |
877e51b2 UD |
243 | struct pthread_unwind_buf unwind_buf; |
244 | ||
245 | /* No previous handlers. */ | |
246 | unwind_buf.priv.data.prev = NULL; | |
247 | unwind_buf.priv.data.cleanup = NULL; | |
248 | ||
249 | int not_first_call; | |
250 | not_first_call = setjmp ((struct __jmp_buf_tag *) unwind_buf.cancel_jmp_buf); | |
18d009ca | 251 | if (__builtin_expect (! not_first_call, 1)) |
76a50749 | 252 | { |
877e51b2 UD |
253 | /* Store the new cleanup handler info. */ |
254 | THREAD_SETMEM (pd, cleanup_jmp_buf, &unwind_buf); | |
255 | ||
76a50749 | 256 | /* Run the code the user provided. */ |
42c8f44c UD |
257 | #ifdef CALL_THREAD_FCT |
258 | THREAD_SETMEM (pd, result, CALL_THREAD_FCT (pd)); | |
259 | #else | |
cc775edf | 260 | THREAD_SETMEM (pd, result, pd->start_routine (pd->arg)); |
42c8f44c | 261 | #endif |
76a50749 UD |
262 | } |
263 | ||
6b4686a5 | 264 | /* Run the destructor for the thread-local data. */ |
877e51b2 | 265 | deallocate_tsd (); |
6b4686a5 | 266 | |
12d7ca07 RM |
267 | /* Clean up any state libc stored in thread-local variables. */ |
268 | __libc_thread_freeres (); | |
76a50749 | 269 | |
47202270 UD |
270 | /* If this is the last thread we terminate the process now. We |
271 | do not notify the debugger, it might just irritate it if there | |
272 | is no thread left. */ | |
729924a0 | 273 | if (__builtin_expect (atomic_decrement_and_test (&__nptl_nthreads), 0)) |
47202270 UD |
274 | /* This was the last thread. */ |
275 | exit (0); | |
276 | ||
76a50749 UD |
277 | /* Report the death of the thread if this is wanted. */ |
278 | if (__builtin_expect (pd->report_events, 0)) | |
279 | { | |
280 | /* See whether TD_DEATH is in any of the mask. */ | |
281 | const int idx = __td_eventword (TD_DEATH); | |
282 | const uint32_t mask = __td_eventmask (TD_DEATH); | |
283 | ||
284 | if ((mask & (__nptl_threads_events.event_bits[idx] | |
285 | | pd->eventbuf.eventmask.event_bits[idx])) != 0) | |
286 | { | |
287 | /* Yep, we have to signal the death. Add the descriptor to | |
288 | the list but only if it is not already on it. */ | |
289 | if (pd->nextevent == NULL) | |
290 | { | |
291 | pd->eventbuf.eventnum = TD_DEATH; | |
292 | pd->eventbuf.eventdata = pd; | |
293 | ||
294 | do | |
295 | pd->nextevent = __nptl_last_event; | |
5a3ab2fc UD |
296 | while (atomic_compare_and_exchange_bool_acq (&__nptl_last_event, |
297 | pd, pd->nextevent)); | |
76a50749 UD |
298 | } |
299 | ||
300 | /* Now call the function to signal the event. */ | |
301 | __nptl_death_event (); | |
302 | } | |
303 | } | |
304 | ||
6461e577 RM |
305 | /* The thread is exiting now. Don't set this bit until after we've hit |
306 | the event-reporting breakpoint, so that td_thr_get_info on us while at | |
307 | the breakpoint reports TD_THR_RUN state rather than TD_THR_ZOMBIE. */ | |
308 | atomic_bit_set (&pd->cancelhandling, EXITING_BIT); | |
76a50749 | 309 | |
76a50749 UD |
310 | /* If the thread is detached free the TCB. */ |
311 | if (IS_DETACHED (pd)) | |
312 | /* Free the TCB. */ | |
313 | __free_tcb (pd); | |
314 | ||
315 | /* We cannot call '_exit' here. '_exit' will terminate the process. | |
316 | ||
317 | The 'exit' implementation in the kernel will signal when the | |
318 | process is really dead since 'clone' got passed the CLONE_CLEARTID | |
319 | flag. The 'tid' field in the TCB will be set to zero. | |
320 | ||
321 | The exit code is zero since in case all threads exit by calling | |
322 | 'pthread_exit' the exit status must be 0 (zero). */ | |
323 | __exit_thread_inline (0); | |
324 | ||
325 | /* NOTREACHED */ | |
326 | return 0; | |
327 | } | |
328 | ||
329 | ||
330 | /* Just list start_thread but we do some more things needed for a run | |
331 | with a debugger attached. */ | |
332 | static int | |
333 | start_thread_debug (void *arg) | |
334 | { | |
335 | struct pthread *pd = (struct pthread *) arg; | |
336 | ||
337 | /* Get the lock the parent locked to force synchronization. */ | |
338 | lll_lock (pd->lock); | |
339 | /* And give it up right away. */ | |
340 | lll_unlock (pd->lock); | |
341 | ||
342 | /* Now do the actual startup. */ | |
343 | return start_thread (arg); | |
344 | } | |
345 | ||
346 | ||
347 | /* Default thread attributes for the case when the user does not | |
348 | provide any. */ | |
349 | static const struct pthread_attr default_attr = | |
350 | { | |
351 | /* Just some value > 0 which gets rounded to the nearest page size. */ | |
352 | .guardsize = 1, | |
353 | }; | |
354 | ||
355 | ||
356 | int | |
357 | __pthread_create_2_1 (newthread, attr, start_routine, arg) | |
358 | pthread_t *newthread; | |
359 | const pthread_attr_t *attr; | |
360 | void *(*start_routine) (void *); | |
361 | void *arg; | |
362 | { | |
363 | STACK_VARIABLES; | |
364 | const struct pthread_attr *iattr; | |
365 | struct pthread *pd; | |
366 | int err; | |
367 | ||
368 | iattr = (struct pthread_attr *) attr; | |
369 | if (iattr == NULL) | |
370 | /* Is this the best idea? On NUMA machines this could mean | |
371 | accessing far-away memory. */ | |
372 | iattr = &default_attr; | |
373 | ||
374 | err = ALLOCATE_STACK (iattr, &pd); | |
729924a0 | 375 | if (__builtin_expect (err != 0, 0)) |
76a50749 UD |
376 | /* Something went wrong. Maybe a parameter of the attributes is |
377 | invalid or we could not allocate memory. */ | |
378 | return err; | |
379 | ||
380 | ||
381 | /* Initialize the TCB. All initializations with zero should be | |
382 | performed in 'get_cached_stack'. This way we avoid doing this if | |
383 | the stack freshly allocated with 'mmap'. */ | |
384 | ||
5d5d5969 | 385 | #ifdef TLS_TCB_AT_TP |
76a50749 | 386 | /* Reference to the TCB itself. */ |
55c11fbd | 387 | pd->header.self = pd; |
76a50749 | 388 | |
d4f64e1a | 389 | /* Self-reference for TLS. */ |
55c11fbd | 390 | pd->header.tcb = pd; |
76a50749 UD |
391 | #endif |
392 | ||
393 | /* Store the address of the start routine and the parameter. Since | |
394 | we do not start the function directly the stillborn thread will | |
395 | get the information from its thread descriptor. */ | |
396 | pd->start_routine = start_routine; | |
397 | pd->arg = arg; | |
398 | ||
399 | /* Copy the thread attribute flags. */ | |
400 | pd->flags = iattr->flags; | |
401 | ||
402 | /* Initialize the field for the ID of the thread which is waiting | |
403 | for us. This is a self-reference in case the thread is created | |
404 | detached. */ | |
405 | pd->joinid = iattr->flags & ATTR_FLAG_DETACHSTATE ? pd : NULL; | |
406 | ||
407 | /* The debug events are inherited from the parent. */ | |
408 | pd->eventbuf = THREAD_SELF->eventbuf; | |
409 | ||
410 | ||
411 | /* Determine scheduling parameters for the thread. | |
412 | XXX How to determine whether scheduling handling is needed? */ | |
413 | if (0 && attr != NULL) | |
414 | { | |
415 | if (iattr->flags & ATTR_FLAG_NOTINHERITSCHED) | |
416 | { | |
417 | /* Use the scheduling parameters the user provided. */ | |
418 | pd->schedpolicy = iattr->schedpolicy; | |
419 | memcpy (&pd->schedparam, &iattr->schedparam, | |
420 | sizeof (struct sched_param)); | |
421 | } | |
422 | else | |
423 | { | |
424 | /* Just store the scheduling attributes of the parent. */ | |
425 | pd->schedpolicy = __sched_getscheduler (0); | |
426 | __sched_getparam (0, &pd->schedparam); | |
427 | } | |
428 | } | |
429 | ||
430 | /* Pass the descriptor to the caller. */ | |
431 | *newthread = (pthread_t) pd; | |
432 | ||
433 | /* Start the thread. */ | |
80f536db | 434 | err = create_thread (pd, iattr, STACK_VARIABLES_ARGS); |
76a50749 UD |
435 | if (err != 0) |
436 | { | |
437 | /* Something went wrong. Free the resources. */ | |
438 | __deallocate_stack (pd); | |
439 | return err; | |
440 | } | |
441 | ||
442 | return 0; | |
443 | } | |
444 | versioned_symbol (libpthread, __pthread_create_2_1, pthread_create, GLIBC_2_1); | |
445 | ||
446 | ||
447 | #if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1) | |
448 | int | |
449 | __pthread_create_2_0 (newthread, attr, start_routine, arg) | |
450 | pthread_t *newthread; | |
451 | const pthread_attr_t *attr; | |
452 | void *(*start_routine) (void *); | |
453 | void *arg; | |
454 | { | |
455 | /* The ATTR attribute is not really of type `pthread_attr_t *'. It has | |
456 | the old size and access to the new members might crash the program. | |
457 | We convert the struct now. */ | |
458 | struct pthread_attr new_attr; | |
459 | ||
460 | if (attr != NULL) | |
461 | { | |
462 | struct pthread_attr *iattr = (struct pthread_attr *) attr; | |
463 | size_t ps = __getpagesize (); | |
464 | ||
465 | /* Copy values from the user-provided attributes. */ | |
466 | new_attr.schedparam = iattr->schedparam; | |
467 | new_attr.schedpolicy = iattr->schedpolicy; | |
468 | new_attr.flags = iattr->flags; | |
469 | ||
470 | /* Fill in default values for the fields not present in the old | |
471 | implementation. */ | |
472 | new_attr.guardsize = ps; | |
473 | new_attr.stackaddr = NULL; | |
474 | new_attr.stacksize = 0; | |
475 | ||
476 | /* We will pass this value on to the real implementation. */ | |
477 | attr = (pthread_attr_t *) &new_attr; | |
478 | } | |
479 | ||
480 | return __pthread_create_2_1 (newthread, attr, start_routine, arg); | |
481 | } | |
482 | compat_symbol (libpthread, __pthread_create_2_0, pthread_create, | |
483 | GLIBC_2_0); | |
484 | #endif |