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Commit | Line | Data |
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e5d355d1 AL |
1 | /* |
2 | * Wrappers around mutex/cond/thread functions | |
3 | * | |
4 | * Copyright Red Hat, Inc. 2009 | |
5 | * | |
6 | * Author: | |
7 | * Marcelo Tosatti <mtosatti@redhat.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
10 | * See the COPYING file in the top-level directory. | |
11 | * | |
12 | */ | |
aafd7584 | 13 | #include "qemu/osdep.h" |
1de7afc9 | 14 | #include "qemu/thread.h" |
c7c4d063 | 15 | #include "qemu/atomic.h" |
ef57137f | 16 | #include "qemu/notify.h" |
f1aff7aa | 17 | #include "qemu-thread-common.h" |
ce9f0e5b | 18 | #include "qemu/tsan.h" |
e5d355d1 | 19 | |
8f480de0 DDAG |
20 | static bool name_threads; |
21 | ||
22 | void qemu_thread_naming(bool enable) | |
23 | { | |
24 | name_threads = enable; | |
5c312079 | 25 | |
10f6b231 PB |
26 | #if !defined CONFIG_PTHREAD_SETNAME_NP_W_TID && \ |
27 | !defined CONFIG_PTHREAD_SETNAME_NP_WO_TID | |
5c312079 DDAG |
28 | /* This is a debugging option, not fatal */ |
29 | if (enable) { | |
30 | fprintf(stderr, "qemu: thread naming not supported on this host\n"); | |
31 | } | |
32 | #endif | |
8f480de0 DDAG |
33 | } |
34 | ||
e5d355d1 AL |
35 | static void error_exit(int err, const char *msg) |
36 | { | |
37 | fprintf(stderr, "qemu: %s: %s\n", msg, strerror(err)); | |
53380ac3 | 38 | abort(); |
e5d355d1 AL |
39 | } |
40 | ||
3dcc9c6e YK |
41 | static void compute_abs_deadline(struct timespec *ts, int ms) |
42 | { | |
43 | struct timeval tv; | |
44 | gettimeofday(&tv, NULL); | |
45 | ts->tv_nsec = tv.tv_usec * 1000 + (ms % 1000) * 1000000; | |
46 | ts->tv_sec = tv.tv_sec + ms / 1000; | |
47 | if (ts->tv_nsec >= 1000000000) { | |
48 | ts->tv_sec++; | |
49 | ts->tv_nsec -= 1000000000; | |
50 | } | |
51 | } | |
52 | ||
e5d355d1 AL |
53 | void qemu_mutex_init(QemuMutex *mutex) |
54 | { | |
55 | int err; | |
56 | ||
24fa9049 | 57 | err = pthread_mutex_init(&mutex->lock, NULL); |
e5d355d1 AL |
58 | if (err) |
59 | error_exit(err, __func__); | |
f1aff7aa | 60 | qemu_mutex_post_init(mutex); |
e5d355d1 AL |
61 | } |
62 | ||
313b1d69 CC |
63 | void qemu_mutex_destroy(QemuMutex *mutex) |
64 | { | |
65 | int err; | |
66 | ||
c096358e FZ |
67 | assert(mutex->initialized); |
68 | mutex->initialized = false; | |
313b1d69 CC |
69 | err = pthread_mutex_destroy(&mutex->lock); |
70 | if (err) | |
71 | error_exit(err, __func__); | |
72 | } | |
73 | ||
6c27a0de | 74 | void qemu_mutex_lock_impl(QemuMutex *mutex, const char *file, const int line) |
e5d355d1 AL |
75 | { |
76 | int err; | |
77 | ||
c096358e | 78 | assert(mutex->initialized); |
f1aff7aa | 79 | qemu_mutex_pre_lock(mutex, file, line); |
e5d355d1 AL |
80 | err = pthread_mutex_lock(&mutex->lock); |
81 | if (err) | |
82 | error_exit(err, __func__); | |
f1aff7aa | 83 | qemu_mutex_post_lock(mutex, file, line); |
e5d355d1 AL |
84 | } |
85 | ||
6c27a0de | 86 | int qemu_mutex_trylock_impl(QemuMutex *mutex, const char *file, const int line) |
e5d355d1 | 87 | { |
31f5a726 JRZ |
88 | int err; |
89 | ||
c096358e | 90 | assert(mutex->initialized); |
31f5a726 JRZ |
91 | err = pthread_mutex_trylock(&mutex->lock); |
92 | if (err == 0) { | |
f1aff7aa | 93 | qemu_mutex_post_lock(mutex, file, line); |
31f5a726 JRZ |
94 | return 0; |
95 | } | |
96 | if (err != EBUSY) { | |
97 | error_exit(err, __func__); | |
98 | } | |
99 | return -EBUSY; | |
e5d355d1 AL |
100 | } |
101 | ||
6c27a0de | 102 | void qemu_mutex_unlock_impl(QemuMutex *mutex, const char *file, const int line) |
e5d355d1 AL |
103 | { |
104 | int err; | |
105 | ||
c096358e | 106 | assert(mutex->initialized); |
f1aff7aa | 107 | qemu_mutex_pre_unlock(mutex, file, line); |
e5d355d1 AL |
108 | err = pthread_mutex_unlock(&mutex->lock); |
109 | if (err) | |
110 | error_exit(err, __func__); | |
111 | } | |
112 | ||
feadec63 PB |
113 | void qemu_rec_mutex_init(QemuRecMutex *mutex) |
114 | { | |
115 | int err; | |
116 | pthread_mutexattr_t attr; | |
117 | ||
118 | pthread_mutexattr_init(&attr); | |
119 | pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); | |
6c98635e | 120 | err = pthread_mutex_init(&mutex->m.lock, &attr); |
feadec63 PB |
121 | pthread_mutexattr_destroy(&attr); |
122 | if (err) { | |
123 | error_exit(err, __func__); | |
124 | } | |
6c98635e | 125 | mutex->m.initialized = true; |
feadec63 PB |
126 | } |
127 | ||
4b193bb7 RH |
128 | void qemu_rec_mutex_destroy(QemuRecMutex *mutex) |
129 | { | |
6c98635e | 130 | qemu_mutex_destroy(&mutex->m); |
4b193bb7 RH |
131 | } |
132 | ||
133 | void qemu_rec_mutex_lock_impl(QemuRecMutex *mutex, const char *file, int line) | |
134 | { | |
6c98635e | 135 | qemu_mutex_lock_impl(&mutex->m, file, line); |
4b193bb7 RH |
136 | } |
137 | ||
138 | int qemu_rec_mutex_trylock_impl(QemuRecMutex *mutex, const char *file, int line) | |
139 | { | |
6c98635e | 140 | return qemu_mutex_trylock_impl(&mutex->m, file, line); |
4b193bb7 RH |
141 | } |
142 | ||
9c75bae7 | 143 | void qemu_rec_mutex_unlock_impl(QemuRecMutex *mutex, const char *file, int line) |
4b193bb7 | 144 | { |
6c98635e | 145 | qemu_mutex_unlock_impl(&mutex->m, file, line); |
4b193bb7 RH |
146 | } |
147 | ||
e5d355d1 AL |
148 | void qemu_cond_init(QemuCond *cond) |
149 | { | |
150 | int err; | |
151 | ||
152 | err = pthread_cond_init(&cond->cond, NULL); | |
153 | if (err) | |
154 | error_exit(err, __func__); | |
c096358e | 155 | cond->initialized = true; |
e5d355d1 AL |
156 | } |
157 | ||
313b1d69 CC |
158 | void qemu_cond_destroy(QemuCond *cond) |
159 | { | |
160 | int err; | |
161 | ||
c096358e FZ |
162 | assert(cond->initialized); |
163 | cond->initialized = false; | |
313b1d69 CC |
164 | err = pthread_cond_destroy(&cond->cond); |
165 | if (err) | |
166 | error_exit(err, __func__); | |
167 | } | |
168 | ||
e5d355d1 AL |
169 | void qemu_cond_signal(QemuCond *cond) |
170 | { | |
171 | int err; | |
172 | ||
c096358e | 173 | assert(cond->initialized); |
e5d355d1 AL |
174 | err = pthread_cond_signal(&cond->cond); |
175 | if (err) | |
176 | error_exit(err, __func__); | |
177 | } | |
178 | ||
179 | void qemu_cond_broadcast(QemuCond *cond) | |
180 | { | |
181 | int err; | |
182 | ||
c096358e | 183 | assert(cond->initialized); |
e5d355d1 AL |
184 | err = pthread_cond_broadcast(&cond->cond); |
185 | if (err) | |
186 | error_exit(err, __func__); | |
187 | } | |
188 | ||
6c27a0de | 189 | void qemu_cond_wait_impl(QemuCond *cond, QemuMutex *mutex, const char *file, const int line) |
e5d355d1 AL |
190 | { |
191 | int err; | |
192 | ||
c096358e | 193 | assert(cond->initialized); |
f1aff7aa | 194 | qemu_mutex_pre_unlock(mutex, file, line); |
e5d355d1 | 195 | err = pthread_cond_wait(&cond->cond, &mutex->lock); |
f1aff7aa | 196 | qemu_mutex_post_lock(mutex, file, line); |
e5d355d1 AL |
197 | if (err) |
198 | error_exit(err, __func__); | |
199 | } | |
200 | ||
3dcc9c6e YK |
201 | bool qemu_cond_timedwait_impl(QemuCond *cond, QemuMutex *mutex, int ms, |
202 | const char *file, const int line) | |
203 | { | |
204 | int err; | |
205 | struct timespec ts; | |
206 | ||
207 | assert(cond->initialized); | |
208 | trace_qemu_mutex_unlock(mutex, file, line); | |
209 | compute_abs_deadline(&ts, ms); | |
210 | err = pthread_cond_timedwait(&cond->cond, &mutex->lock, &ts); | |
211 | trace_qemu_mutex_locked(mutex, file, line); | |
212 | if (err && err != ETIMEDOUT) { | |
213 | error_exit(err, __func__); | |
214 | } | |
215 | return err != ETIMEDOUT; | |
216 | } | |
217 | ||
38b14db3 PB |
218 | void qemu_sem_init(QemuSemaphore *sem, int init) |
219 | { | |
220 | int rc; | |
221 | ||
401bc051 | 222 | #ifndef CONFIG_SEM_TIMEDWAIT |
c166cb72 PB |
223 | rc = pthread_mutex_init(&sem->lock, NULL); |
224 | if (rc != 0) { | |
225 | error_exit(rc, __func__); | |
226 | } | |
227 | rc = pthread_cond_init(&sem->cond, NULL); | |
228 | if (rc != 0) { | |
229 | error_exit(rc, __func__); | |
230 | } | |
231 | if (init < 0) { | |
232 | error_exit(EINVAL, __func__); | |
233 | } | |
234 | sem->count = init; | |
235 | #else | |
38b14db3 PB |
236 | rc = sem_init(&sem->sem, 0, init); |
237 | if (rc < 0) { | |
238 | error_exit(errno, __func__); | |
239 | } | |
c166cb72 | 240 | #endif |
c096358e | 241 | sem->initialized = true; |
38b14db3 PB |
242 | } |
243 | ||
244 | void qemu_sem_destroy(QemuSemaphore *sem) | |
245 | { | |
246 | int rc; | |
247 | ||
c096358e FZ |
248 | assert(sem->initialized); |
249 | sem->initialized = false; | |
401bc051 | 250 | #ifndef CONFIG_SEM_TIMEDWAIT |
c166cb72 PB |
251 | rc = pthread_cond_destroy(&sem->cond); |
252 | if (rc < 0) { | |
253 | error_exit(rc, __func__); | |
254 | } | |
255 | rc = pthread_mutex_destroy(&sem->lock); | |
256 | if (rc < 0) { | |
257 | error_exit(rc, __func__); | |
258 | } | |
259 | #else | |
38b14db3 PB |
260 | rc = sem_destroy(&sem->sem); |
261 | if (rc < 0) { | |
262 | error_exit(errno, __func__); | |
263 | } | |
c166cb72 | 264 | #endif |
38b14db3 PB |
265 | } |
266 | ||
267 | void qemu_sem_post(QemuSemaphore *sem) | |
268 | { | |
269 | int rc; | |
270 | ||
c096358e | 271 | assert(sem->initialized); |
401bc051 | 272 | #ifndef CONFIG_SEM_TIMEDWAIT |
c166cb72 | 273 | pthread_mutex_lock(&sem->lock); |
79761c66 | 274 | if (sem->count == UINT_MAX) { |
c166cb72 | 275 | rc = EINVAL; |
c166cb72 | 276 | } else { |
79761c66 IT |
277 | sem->count++; |
278 | rc = pthread_cond_signal(&sem->cond); | |
c166cb72 PB |
279 | } |
280 | pthread_mutex_unlock(&sem->lock); | |
281 | if (rc != 0) { | |
282 | error_exit(rc, __func__); | |
283 | } | |
284 | #else | |
38b14db3 PB |
285 | rc = sem_post(&sem->sem); |
286 | if (rc < 0) { | |
287 | error_exit(errno, __func__); | |
288 | } | |
c166cb72 PB |
289 | #endif |
290 | } | |
291 | ||
38b14db3 PB |
292 | int qemu_sem_timedwait(QemuSemaphore *sem, int ms) |
293 | { | |
294 | int rc; | |
c166cb72 PB |
295 | struct timespec ts; |
296 | ||
c096358e | 297 | assert(sem->initialized); |
401bc051 | 298 | #ifndef CONFIG_SEM_TIMEDWAIT |
79761c66 | 299 | rc = 0; |
c166cb72 PB |
300 | compute_abs_deadline(&ts, ms); |
301 | pthread_mutex_lock(&sem->lock); | |
79761c66 | 302 | while (sem->count == 0) { |
c166cb72 PB |
303 | rc = pthread_cond_timedwait(&sem->cond, &sem->lock, &ts); |
304 | if (rc == ETIMEDOUT) { | |
305 | break; | |
306 | } | |
307 | if (rc != 0) { | |
308 | error_exit(rc, __func__); | |
309 | } | |
310 | } | |
79761c66 IT |
311 | if (rc != ETIMEDOUT) { |
312 | --sem->count; | |
313 | } | |
c166cb72 PB |
314 | pthread_mutex_unlock(&sem->lock); |
315 | return (rc == ETIMEDOUT ? -1 : 0); | |
316 | #else | |
38b14db3 PB |
317 | if (ms <= 0) { |
318 | /* This is cheaper than sem_timedwait. */ | |
319 | do { | |
320 | rc = sem_trywait(&sem->sem); | |
321 | } while (rc == -1 && errno == EINTR); | |
322 | if (rc == -1 && errno == EAGAIN) { | |
323 | return -1; | |
324 | } | |
325 | } else { | |
c166cb72 | 326 | compute_abs_deadline(&ts, ms); |
38b14db3 PB |
327 | do { |
328 | rc = sem_timedwait(&sem->sem, &ts); | |
329 | } while (rc == -1 && errno == EINTR); | |
330 | if (rc == -1 && errno == ETIMEDOUT) { | |
331 | return -1; | |
332 | } | |
333 | } | |
334 | if (rc < 0) { | |
335 | error_exit(errno, __func__); | |
336 | } | |
337 | return 0; | |
c166cb72 | 338 | #endif |
38b14db3 PB |
339 | } |
340 | ||
341 | void qemu_sem_wait(QemuSemaphore *sem) | |
342 | { | |
79761c66 IT |
343 | int rc; |
344 | ||
c096358e | 345 | assert(sem->initialized); |
401bc051 | 346 | #ifndef CONFIG_SEM_TIMEDWAIT |
c166cb72 | 347 | pthread_mutex_lock(&sem->lock); |
79761c66 IT |
348 | while (sem->count == 0) { |
349 | rc = pthread_cond_wait(&sem->cond, &sem->lock); | |
350 | if (rc != 0) { | |
351 | error_exit(rc, __func__); | |
352 | } | |
c166cb72 | 353 | } |
79761c66 | 354 | --sem->count; |
c166cb72 PB |
355 | pthread_mutex_unlock(&sem->lock); |
356 | #else | |
38b14db3 PB |
357 | do { |
358 | rc = sem_wait(&sem->sem); | |
359 | } while (rc == -1 && errno == EINTR); | |
360 | if (rc < 0) { | |
361 | error_exit(errno, __func__); | |
362 | } | |
c166cb72 | 363 | #endif |
38b14db3 PB |
364 | } |
365 | ||
c7c4d063 | 366 | #ifdef __linux__ |
fbcc3e50 | 367 | #include "qemu/futex.h" |
c7c4d063 | 368 | #else |
fbcc3e50 | 369 | static inline void qemu_futex_wake(QemuEvent *ev, int n) |
c7c4d063 | 370 | { |
c096358e | 371 | assert(ev->initialized); |
158ef8cb | 372 | pthread_mutex_lock(&ev->lock); |
c7c4d063 PB |
373 | if (n == 1) { |
374 | pthread_cond_signal(&ev->cond); | |
375 | } else { | |
376 | pthread_cond_broadcast(&ev->cond); | |
377 | } | |
158ef8cb | 378 | pthread_mutex_unlock(&ev->lock); |
c7c4d063 PB |
379 | } |
380 | ||
fbcc3e50 | 381 | static inline void qemu_futex_wait(QemuEvent *ev, unsigned val) |
c7c4d063 | 382 | { |
c096358e | 383 | assert(ev->initialized); |
c7c4d063 PB |
384 | pthread_mutex_lock(&ev->lock); |
385 | if (ev->value == val) { | |
386 | pthread_cond_wait(&ev->cond, &ev->lock); | |
387 | } | |
388 | pthread_mutex_unlock(&ev->lock); | |
389 | } | |
390 | #endif | |
391 | ||
392 | /* Valid transitions: | |
393 | * - free->set, when setting the event | |
fbcc3e50 | 394 | * - busy->set, when setting the event, followed by qemu_futex_wake |
c7c4d063 PB |
395 | * - set->free, when resetting the event |
396 | * - free->busy, when waiting | |
397 | * | |
398 | * set->busy does not happen (it can be observed from the outside but | |
399 | * it really is set->free->busy). | |
400 | * | |
401 | * busy->free provably cannot happen; to enforce it, the set->free transition | |
402 | * is done with an OR, which becomes a no-op if the event has concurrently | |
403 | * transitioned to free or busy. | |
404 | */ | |
405 | ||
406 | #define EV_SET 0 | |
407 | #define EV_FREE 1 | |
408 | #define EV_BUSY -1 | |
409 | ||
410 | void qemu_event_init(QemuEvent *ev, bool init) | |
411 | { | |
412 | #ifndef __linux__ | |
413 | pthread_mutex_init(&ev->lock, NULL); | |
414 | pthread_cond_init(&ev->cond, NULL); | |
415 | #endif | |
416 | ||
417 | ev->value = (init ? EV_SET : EV_FREE); | |
c096358e | 418 | ev->initialized = true; |
c7c4d063 PB |
419 | } |
420 | ||
421 | void qemu_event_destroy(QemuEvent *ev) | |
422 | { | |
c096358e FZ |
423 | assert(ev->initialized); |
424 | ev->initialized = false; | |
c7c4d063 PB |
425 | #ifndef __linux__ |
426 | pthread_mutex_destroy(&ev->lock); | |
427 | pthread_cond_destroy(&ev->cond); | |
428 | #endif | |
429 | } | |
430 | ||
431 | void qemu_event_set(QemuEvent *ev) | |
432 | { | |
374293ca PB |
433 | /* qemu_event_set has release semantics, but because it *loads* |
434 | * ev->value we need a full memory barrier here. | |
435 | */ | |
c096358e | 436 | assert(ev->initialized); |
374293ca | 437 | smp_mb(); |
d73415a3 SH |
438 | if (qatomic_read(&ev->value) != EV_SET) { |
439 | if (qatomic_xchg(&ev->value, EV_SET) == EV_BUSY) { | |
c7c4d063 | 440 | /* There were waiters, wake them up. */ |
fbcc3e50 | 441 | qemu_futex_wake(ev, INT_MAX); |
c7c4d063 PB |
442 | } |
443 | } | |
444 | } | |
445 | ||
446 | void qemu_event_reset(QemuEvent *ev) | |
447 | { | |
374293ca PB |
448 | unsigned value; |
449 | ||
c096358e | 450 | assert(ev->initialized); |
d73415a3 | 451 | value = qatomic_read(&ev->value); |
374293ca PB |
452 | smp_mb_acquire(); |
453 | if (value == EV_SET) { | |
c7c4d063 PB |
454 | /* |
455 | * If there was a concurrent reset (or even reset+wait), | |
456 | * do nothing. Otherwise change EV_SET->EV_FREE. | |
457 | */ | |
d73415a3 | 458 | qatomic_or(&ev->value, EV_FREE); |
c7c4d063 PB |
459 | } |
460 | } | |
461 | ||
462 | void qemu_event_wait(QemuEvent *ev) | |
463 | { | |
464 | unsigned value; | |
465 | ||
c096358e | 466 | assert(ev->initialized); |
d73415a3 | 467 | value = qatomic_read(&ev->value); |
374293ca | 468 | smp_mb_acquire(); |
c7c4d063 PB |
469 | if (value != EV_SET) { |
470 | if (value == EV_FREE) { | |
471 | /* | |
472 | * Leave the event reset and tell qemu_event_set that there | |
473 | * are waiters. No need to retry, because there cannot be | |
67cc32eb | 474 | * a concurrent busy->free transition. After the CAS, the |
c7c4d063 PB |
475 | * event will be either set or busy. |
476 | */ | |
d73415a3 | 477 | if (qatomic_cmpxchg(&ev->value, EV_FREE, EV_BUSY) == EV_SET) { |
c7c4d063 PB |
478 | return; |
479 | } | |
480 | } | |
fbcc3e50 | 481 | qemu_futex_wait(ev, EV_BUSY); |
c7c4d063 PB |
482 | } |
483 | } | |
484 | ||
a458774a | 485 | static __thread NotifierList thread_exit; |
ef57137f | 486 | |
a458774a PM |
487 | /* |
488 | * Note that in this implementation you can register a thread-exit | |
489 | * notifier for the main thread, but it will never be called. | |
490 | * This is OK because main thread exit can only happen when the | |
491 | * entire process is exiting, and the API allows notifiers to not | |
492 | * be called on process exit. | |
493 | */ | |
ef57137f PB |
494 | void qemu_thread_atexit_add(Notifier *notifier) |
495 | { | |
a458774a | 496 | notifier_list_add(&thread_exit, notifier); |
ef57137f PB |
497 | } |
498 | ||
499 | void qemu_thread_atexit_remove(Notifier *notifier) | |
500 | { | |
ef57137f | 501 | notifier_remove(notifier); |
ef57137f PB |
502 | } |
503 | ||
a458774a | 504 | static void qemu_thread_atexit_notify(void *arg) |
ef57137f | 505 | { |
a458774a PM |
506 | /* |
507 | * Called when non-main thread exits (via qemu_thread_exit() | |
508 | * or by returning from its start routine.) | |
509 | */ | |
510 | notifier_list_notify(&thread_exit, NULL); | |
ef57137f PB |
511 | } |
512 | ||
68a93982 | 513 | typedef struct { |
514 | void *(*start_routine)(void *); | |
515 | void *arg; | |
516 | char *name; | |
517 | } QemuThreadArgs; | |
518 | ||
519 | static void *qemu_thread_start(void *args) | |
520 | { | |
521 | QemuThreadArgs *qemu_thread_args = args; | |
522 | void *(*start_routine)(void *) = qemu_thread_args->start_routine; | |
523 | void *arg = qemu_thread_args->arg; | |
a458774a | 524 | void *r; |
68a93982 | 525 | |
526 | /* Attempt to set the threads name; note that this is for debug, so | |
527 | * we're not going to fail if we can't set it. | |
528 | */ | |
d820fa5b | 529 | if (name_threads && qemu_thread_args->name) { |
479a5747 | 530 | # if defined(CONFIG_PTHREAD_SETNAME_NP_W_TID) |
d820fa5b | 531 | pthread_setname_np(pthread_self(), qemu_thread_args->name); |
479a5747 RB |
532 | # elif defined(CONFIG_PTHREAD_SETNAME_NP_WO_TID) |
533 | pthread_setname_np(qemu_thread_args->name); | |
534 | # endif | |
d820fa5b | 535 | } |
ce9f0e5b | 536 | QEMU_TSAN_ANNOTATE_THREAD_NAME(qemu_thread_args->name); |
68a93982 | 537 | g_free(qemu_thread_args->name); |
538 | g_free(qemu_thread_args); | |
37daf1ba RH |
539 | |
540 | /* | |
541 | * GCC 11 with glibc 2.17 on PowerPC reports | |
542 | * | |
543 | * qemu-thread-posix.c:540:5: error: ‘__sigsetjmp’ accessing 656 bytes | |
544 | * in a region of size 528 [-Werror=stringop-overflow=] | |
545 | * 540 | pthread_cleanup_push(qemu_thread_atexit_notify, NULL); | |
546 | * | ^~~~~~~~~~~~~~~~~~~~ | |
547 | * | |
548 | * which is clearly nonsense. | |
549 | */ | |
550 | #pragma GCC diagnostic push | |
551 | #ifndef __clang__ | |
552 | #pragma GCC diagnostic ignored "-Wstringop-overflow" | |
553 | #endif | |
554 | ||
a458774a PM |
555 | pthread_cleanup_push(qemu_thread_atexit_notify, NULL); |
556 | r = start_routine(arg); | |
557 | pthread_cleanup_pop(1); | |
37daf1ba RH |
558 | |
559 | #pragma GCC diagnostic pop | |
560 | ||
a458774a | 561 | return r; |
5c312079 DDAG |
562 | } |
563 | ||
4900116e | 564 | void qemu_thread_create(QemuThread *thread, const char *name, |
e5d355d1 | 565 | void *(*start_routine)(void*), |
cf218714 | 566 | void *arg, int mode) |
e5d355d1 | 567 | { |
cf218714 | 568 | sigset_t set, oldset; |
e5d355d1 | 569 | int err; |
8763046b | 570 | pthread_attr_t attr; |
d820fa5b | 571 | QemuThreadArgs *qemu_thread_args; |
e5d355d1 | 572 | |
8763046b JK |
573 | err = pthread_attr_init(&attr); |
574 | if (err) { | |
575 | error_exit(err, __func__); | |
576 | } | |
55541c8a | 577 | |
68a93982 | 578 | if (mode == QEMU_THREAD_DETACHED) { |
579 | pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
580 | } | |
581 | ||
cf218714 | 582 | /* Leave signal handling to the iothread. */ |
55541c8a | 583 | sigfillset(&set); |
21a43af0 RB |
584 | /* Blocking the signals can result in undefined behaviour. */ |
585 | sigdelset(&set, SIGSEGV); | |
586 | sigdelset(&set, SIGFPE); | |
587 | sigdelset(&set, SIGILL); | |
588 | /* TODO avoid SIGBUS loss on macOS */ | |
55541c8a | 589 | pthread_sigmask(SIG_SETMASK, &set, &oldset); |
55541c8a | 590 | |
d820fa5b PX |
591 | qemu_thread_args = g_new0(QemuThreadArgs, 1); |
592 | qemu_thread_args->name = g_strdup(name); | |
593 | qemu_thread_args->start_routine = start_routine; | |
594 | qemu_thread_args->arg = arg; | |
595 | ||
596 | err = pthread_create(&thread->thread, &attr, | |
597 | qemu_thread_start, qemu_thread_args); | |
4900116e | 598 | |
68a93982 | 599 | if (err) |
600 | error_exit(err, __func__); | |
601 | ||
55541c8a | 602 | pthread_sigmask(SIG_SETMASK, &oldset, NULL); |
8763046b JK |
603 | |
604 | pthread_attr_destroy(&attr); | |
e5d355d1 AL |
605 | } |
606 | ||
b7680cb6 | 607 | void qemu_thread_get_self(QemuThread *thread) |
e5d355d1 AL |
608 | { |
609 | thread->thread = pthread_self(); | |
610 | } | |
611 | ||
2d797b65 | 612 | bool qemu_thread_is_self(QemuThread *thread) |
e5d355d1 | 613 | { |
b7680cb6 | 614 | return pthread_equal(pthread_self(), thread->thread); |
e5d355d1 AL |
615 | } |
616 | ||
313b1d69 CC |
617 | void qemu_thread_exit(void *retval) |
618 | { | |
619 | pthread_exit(retval); | |
620 | } | |
8763046b JK |
621 | |
622 | void *qemu_thread_join(QemuThread *thread) | |
623 | { | |
624 | int err; | |
625 | void *ret; | |
626 | ||
627 | err = pthread_join(thread->thread, &ret); | |
628 | if (err) { | |
629 | error_exit(err, __func__); | |
630 | } | |
631 | return ret; | |
632 | } |