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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)); |
fa9a4ff0 | 62 | hidden_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 |
76a50749 UD |
111 | deallocate_tsd (struct pthread *pd) |
112 | { | |
113 | /* Maybe no data was ever allocated. This happens often so we have | |
114 | a flag for this. */ | |
115 | if (pd->specific_used) | |
116 | { | |
117 | size_t round; | |
118 | bool found_nonzero; | |
119 | ||
120 | for (round = 0, found_nonzero = true; | |
121 | found_nonzero && round < PTHREAD_DESTRUCTOR_ITERATIONS; | |
122 | ++round) | |
123 | { | |
124 | size_t cnt; | |
125 | size_t idx; | |
126 | ||
c5acd3d7 UD |
127 | /* So far no new nonzero data entry. */ |
128 | found_nonzero = false; | |
129 | ||
76a50749 UD |
130 | for (cnt = idx = 0; cnt < PTHREAD_KEY_1STLEVEL_SIZE; ++cnt) |
131 | if (pd->specific[cnt] != NULL) | |
132 | { | |
133 | size_t inner; | |
134 | ||
135 | for (inner = 0; inner < PTHREAD_KEY_2NDLEVEL_SIZE; | |
136 | ++inner, ++idx) | |
137 | { | |
138 | void *data = pd->specific[cnt][inner].data; | |
139 | ||
140 | if (data != NULL | |
141 | /* Make sure the data corresponds to a valid | |
142 | key. This test fails if the key was | |
143 | deallocated and also if it was | |
144 | re-allocated. It is the user's | |
145 | responsibility to free the memory in this | |
146 | case. */ | |
147 | && (pd->specific[cnt][inner].seq | |
148 | == __pthread_keys[idx].seq) | |
149 | /* It is not necessary to register a destructor | |
150 | function. */ | |
151 | && __pthread_keys[idx].destr != NULL) | |
152 | { | |
153 | pd->specific[cnt][inner].data = NULL; | |
154 | __pthread_keys[idx].destr (data); | |
155 | found_nonzero = true; | |
156 | } | |
157 | } | |
158 | ||
159 | if (cnt != 0) | |
160 | { | |
161 | /* The first block is allocated as part of the thread | |
162 | descriptor. */ | |
163 | free (pd->specific[cnt]); | |
164 | pd->specific[cnt] = NULL; | |
165 | } | |
166 | else | |
167 | /* Clear the memory of the first block for reuse. */ | |
df5803bf UD |
168 | memset (&pd->specific_1stblock, '\0', |
169 | sizeof (pd->specific_1stblock)); | |
76a50749 UD |
170 | } |
171 | else | |
172 | idx += PTHREAD_KEY_1STLEVEL_SIZE; | |
173 | } | |
174 | ||
175 | pd->specific_used = false; | |
176 | } | |
177 | } | |
178 | ||
179 | ||
180 | /* Deallocate a thread's stack after optionally making sure the thread | |
181 | descriptor is still valid. */ | |
182 | void | |
90491dc4 | 183 | internal_function |
76a50749 UD |
184 | __free_tcb (struct pthread *pd) |
185 | { | |
186 | /* The thread is exiting now. */ | |
ba25bb0f UD |
187 | if (__builtin_expect (atomic_bit_test_set (&pd->cancelhandling, |
188 | TERMINATED_BIT) == 0, 1)) | |
76a50749 UD |
189 | { |
190 | /* Remove the descriptor from the list. */ | |
191 | if (DEBUGGING_P && __find_in_stack_list (pd) == NULL) | |
192 | /* Something is really wrong. The descriptor for a still | |
193 | running thread is gone. */ | |
194 | abort (); | |
195 | ||
196 | /* Run the destructor for the thread-local data. */ | |
197 | deallocate_tsd (pd); | |
198 | ||
199 | /* Queue the stack memory block for reuse and exit the process. The | |
200 | kernel will signal via writing to the address returned by | |
201 | QUEUE-STACK when the stack is available. */ | |
202 | __deallocate_stack (pd); | |
203 | } | |
204 | } | |
205 | ||
206 | ||
207 | static int | |
208 | start_thread (void *arg) | |
209 | { | |
47202270 UD |
210 | /* One more thread. */ |
211 | atomic_increment (&__nptl_nthreads); | |
212 | ||
76a50749 UD |
213 | struct pthread *pd = (struct pthread *) arg; |
214 | ||
215 | #if HP_TIMING_AVAIL | |
216 | /* Remember the time when the thread was started. */ | |
217 | hp_timing_t now; | |
218 | HP_TIMING_NOW (now); | |
219 | THREAD_SETMEM (pd, cpuclock_offset, now); | |
220 | #endif | |
221 | ||
222 | /* This is where the try/finally block should be created. For | |
223 | compilers without that support we do use setjmp. */ | |
0eb18281 | 224 | if (__builtin_expect (setjmp (pd->cancelbuf) == 0, 1)) |
76a50749 UD |
225 | { |
226 | /* Run the code the user provided. */ | |
cc775edf | 227 | THREAD_SETMEM (pd, result, pd->start_routine (pd->arg)); |
76a50749 UD |
228 | } |
229 | ||
12d7ca07 RM |
230 | /* Clean up any state libc stored in thread-local variables. */ |
231 | __libc_thread_freeres (); | |
76a50749 | 232 | |
47202270 UD |
233 | /* If this is the last thread we terminate the process now. We |
234 | do not notify the debugger, it might just irritate it if there | |
235 | is no thread left. */ | |
729924a0 | 236 | if (__builtin_expect (atomic_decrement_and_test (&__nptl_nthreads), 0)) |
47202270 UD |
237 | /* This was the last thread. */ |
238 | exit (0); | |
239 | ||
76a50749 UD |
240 | /* Report the death of the thread if this is wanted. */ |
241 | if (__builtin_expect (pd->report_events, 0)) | |
242 | { | |
243 | /* See whether TD_DEATH is in any of the mask. */ | |
244 | const int idx = __td_eventword (TD_DEATH); | |
245 | const uint32_t mask = __td_eventmask (TD_DEATH); | |
246 | ||
247 | if ((mask & (__nptl_threads_events.event_bits[idx] | |
248 | | pd->eventbuf.eventmask.event_bits[idx])) != 0) | |
249 | { | |
250 | /* Yep, we have to signal the death. Add the descriptor to | |
251 | the list but only if it is not already on it. */ | |
252 | if (pd->nextevent == NULL) | |
253 | { | |
254 | pd->eventbuf.eventnum = TD_DEATH; | |
255 | pd->eventbuf.eventdata = pd; | |
256 | ||
257 | do | |
258 | pd->nextevent = __nptl_last_event; | |
d5ed0118 | 259 | while (atomic_compare_and_exchange_acq (&__nptl_last_event, pd, |
76a50749 UD |
260 | pd->nextevent) != 0); |
261 | } | |
262 | ||
263 | /* Now call the function to signal the event. */ | |
264 | __nptl_death_event (); | |
265 | } | |
266 | } | |
267 | ||
6461e577 RM |
268 | /* The thread is exiting now. Don't set this bit until after we've hit |
269 | the event-reporting breakpoint, so that td_thr_get_info on us while at | |
270 | the breakpoint reports TD_THR_RUN state rather than TD_THR_ZOMBIE. */ | |
271 | atomic_bit_set (&pd->cancelhandling, EXITING_BIT); | |
76a50749 | 272 | |
76a50749 UD |
273 | /* If the thread is detached free the TCB. */ |
274 | if (IS_DETACHED (pd)) | |
275 | /* Free the TCB. */ | |
276 | __free_tcb (pd); | |
277 | ||
278 | /* We cannot call '_exit' here. '_exit' will terminate the process. | |
279 | ||
280 | The 'exit' implementation in the kernel will signal when the | |
281 | process is really dead since 'clone' got passed the CLONE_CLEARTID | |
282 | flag. The 'tid' field in the TCB will be set to zero. | |
283 | ||
284 | The exit code is zero since in case all threads exit by calling | |
285 | 'pthread_exit' the exit status must be 0 (zero). */ | |
286 | __exit_thread_inline (0); | |
287 | ||
288 | /* NOTREACHED */ | |
289 | return 0; | |
290 | } | |
291 | ||
292 | ||
293 | /* Just list start_thread but we do some more things needed for a run | |
294 | with a debugger attached. */ | |
295 | static int | |
296 | start_thread_debug (void *arg) | |
297 | { | |
298 | struct pthread *pd = (struct pthread *) arg; | |
299 | ||
300 | /* Get the lock the parent locked to force synchronization. */ | |
301 | lll_lock (pd->lock); | |
302 | /* And give it up right away. */ | |
303 | lll_unlock (pd->lock); | |
304 | ||
305 | /* Now do the actual startup. */ | |
306 | return start_thread (arg); | |
307 | } | |
308 | ||
309 | ||
310 | /* Default thread attributes for the case when the user does not | |
311 | provide any. */ | |
312 | static const struct pthread_attr default_attr = | |
313 | { | |
314 | /* Just some value > 0 which gets rounded to the nearest page size. */ | |
315 | .guardsize = 1, | |
316 | }; | |
317 | ||
318 | ||
319 | int | |
320 | __pthread_create_2_1 (newthread, attr, start_routine, arg) | |
321 | pthread_t *newthread; | |
322 | const pthread_attr_t *attr; | |
323 | void *(*start_routine) (void *); | |
324 | void *arg; | |
325 | { | |
326 | STACK_VARIABLES; | |
327 | const struct pthread_attr *iattr; | |
328 | struct pthread *pd; | |
329 | int err; | |
330 | ||
331 | iattr = (struct pthread_attr *) attr; | |
332 | if (iattr == NULL) | |
333 | /* Is this the best idea? On NUMA machines this could mean | |
334 | accessing far-away memory. */ | |
335 | iattr = &default_attr; | |
336 | ||
337 | err = ALLOCATE_STACK (iattr, &pd); | |
729924a0 | 338 | if (__builtin_expect (err != 0, 0)) |
76a50749 UD |
339 | /* Something went wrong. Maybe a parameter of the attributes is |
340 | invalid or we could not allocate memory. */ | |
341 | return err; | |
342 | ||
343 | ||
344 | /* Initialize the TCB. All initializations with zero should be | |
345 | performed in 'get_cached_stack'. This way we avoid doing this if | |
346 | the stack freshly allocated with 'mmap'. */ | |
347 | ||
5d5d5969 | 348 | #ifdef TLS_TCB_AT_TP |
76a50749 | 349 | /* Reference to the TCB itself. */ |
d4f64e1a | 350 | pd->self = pd; |
76a50749 | 351 | |
d4f64e1a RM |
352 | /* Self-reference for TLS. */ |
353 | pd->tcb = pd; | |
76a50749 UD |
354 | #endif |
355 | ||
356 | /* Store the address of the start routine and the parameter. Since | |
357 | we do not start the function directly the stillborn thread will | |
358 | get the information from its thread descriptor. */ | |
359 | pd->start_routine = start_routine; | |
360 | pd->arg = arg; | |
361 | ||
362 | /* Copy the thread attribute flags. */ | |
363 | pd->flags = iattr->flags; | |
364 | ||
365 | /* Initialize the field for the ID of the thread which is waiting | |
366 | for us. This is a self-reference in case the thread is created | |
367 | detached. */ | |
368 | pd->joinid = iattr->flags & ATTR_FLAG_DETACHSTATE ? pd : NULL; | |
369 | ||
370 | /* The debug events are inherited from the parent. */ | |
371 | pd->eventbuf = THREAD_SELF->eventbuf; | |
372 | ||
373 | ||
374 | /* Determine scheduling parameters for the thread. | |
375 | XXX How to determine whether scheduling handling is needed? */ | |
376 | if (0 && attr != NULL) | |
377 | { | |
378 | if (iattr->flags & ATTR_FLAG_NOTINHERITSCHED) | |
379 | { | |
380 | /* Use the scheduling parameters the user provided. */ | |
381 | pd->schedpolicy = iattr->schedpolicy; | |
382 | memcpy (&pd->schedparam, &iattr->schedparam, | |
383 | sizeof (struct sched_param)); | |
384 | } | |
385 | else | |
386 | { | |
387 | /* Just store the scheduling attributes of the parent. */ | |
388 | pd->schedpolicy = __sched_getscheduler (0); | |
389 | __sched_getparam (0, &pd->schedparam); | |
390 | } | |
391 | } | |
392 | ||
393 | /* Pass the descriptor to the caller. */ | |
394 | *newthread = (pthread_t) pd; | |
395 | ||
396 | /* Start the thread. */ | |
397 | err = create_thread (pd, STACK_VARIABLES_ARGS); | |
398 | if (err != 0) | |
399 | { | |
400 | /* Something went wrong. Free the resources. */ | |
401 | __deallocate_stack (pd); | |
402 | return err; | |
403 | } | |
404 | ||
405 | return 0; | |
406 | } | |
407 | versioned_symbol (libpthread, __pthread_create_2_1, pthread_create, GLIBC_2_1); | |
408 | ||
409 | ||
410 | #if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1) | |
411 | int | |
412 | __pthread_create_2_0 (newthread, attr, start_routine, arg) | |
413 | pthread_t *newthread; | |
414 | const pthread_attr_t *attr; | |
415 | void *(*start_routine) (void *); | |
416 | void *arg; | |
417 | { | |
418 | /* The ATTR attribute is not really of type `pthread_attr_t *'. It has | |
419 | the old size and access to the new members might crash the program. | |
420 | We convert the struct now. */ | |
421 | struct pthread_attr new_attr; | |
422 | ||
423 | if (attr != NULL) | |
424 | { | |
425 | struct pthread_attr *iattr = (struct pthread_attr *) attr; | |
426 | size_t ps = __getpagesize (); | |
427 | ||
428 | /* Copy values from the user-provided attributes. */ | |
429 | new_attr.schedparam = iattr->schedparam; | |
430 | new_attr.schedpolicy = iattr->schedpolicy; | |
431 | new_attr.flags = iattr->flags; | |
432 | ||
433 | /* Fill in default values for the fields not present in the old | |
434 | implementation. */ | |
435 | new_attr.guardsize = ps; | |
436 | new_attr.stackaddr = NULL; | |
437 | new_attr.stacksize = 0; | |
438 | ||
439 | /* We will pass this value on to the real implementation. */ | |
440 | attr = (pthread_attr_t *) &new_attr; | |
441 | } | |
442 | ||
443 | return __pthread_create_2_1 (newthread, attr, start_routine, arg); | |
444 | } | |
445 | compat_symbol (libpthread, __pthread_create_2_0, pthread_create, | |
446 | GLIBC_2_0); | |
447 | #endif |