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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 DDAG |
25 | |
26 | #ifndef CONFIG_THREAD_SETNAME_BYTHREAD | |
27 | /* This is a debugging option, not fatal */ | |
28 | if (enable) { | |
29 | fprintf(stderr, "qemu: thread naming not supported on this host\n"); | |
30 | } | |
31 | #endif | |
8f480de0 DDAG |
32 | } |
33 | ||
e5d355d1 AL |
34 | static void error_exit(int err, const char *msg) |
35 | { | |
36 | fprintf(stderr, "qemu: %s: %s\n", msg, strerror(err)); | |
53380ac3 | 37 | abort(); |
e5d355d1 AL |
38 | } |
39 | ||
3dcc9c6e YK |
40 | static void compute_abs_deadline(struct timespec *ts, int ms) |
41 | { | |
42 | struct timeval tv; | |
43 | gettimeofday(&tv, NULL); | |
44 | ts->tv_nsec = tv.tv_usec * 1000 + (ms % 1000) * 1000000; | |
45 | ts->tv_sec = tv.tv_sec + ms / 1000; | |
46 | if (ts->tv_nsec >= 1000000000) { | |
47 | ts->tv_sec++; | |
48 | ts->tv_nsec -= 1000000000; | |
49 | } | |
50 | } | |
51 | ||
e5d355d1 AL |
52 | void qemu_mutex_init(QemuMutex *mutex) |
53 | { | |
54 | int err; | |
55 | ||
24fa9049 | 56 | err = pthread_mutex_init(&mutex->lock, NULL); |
e5d355d1 AL |
57 | if (err) |
58 | error_exit(err, __func__); | |
f1aff7aa | 59 | qemu_mutex_post_init(mutex); |
e5d355d1 AL |
60 | } |
61 | ||
313b1d69 CC |
62 | void qemu_mutex_destroy(QemuMutex *mutex) |
63 | { | |
64 | int err; | |
65 | ||
c096358e FZ |
66 | assert(mutex->initialized); |
67 | mutex->initialized = false; | |
313b1d69 CC |
68 | err = pthread_mutex_destroy(&mutex->lock); |
69 | if (err) | |
70 | error_exit(err, __func__); | |
71 | } | |
72 | ||
6c27a0de | 73 | void qemu_mutex_lock_impl(QemuMutex *mutex, const char *file, const int line) |
e5d355d1 AL |
74 | { |
75 | int err; | |
76 | ||
c096358e | 77 | assert(mutex->initialized); |
f1aff7aa | 78 | qemu_mutex_pre_lock(mutex, file, line); |
e5d355d1 AL |
79 | err = pthread_mutex_lock(&mutex->lock); |
80 | if (err) | |
81 | error_exit(err, __func__); | |
f1aff7aa | 82 | qemu_mutex_post_lock(mutex, file, line); |
e5d355d1 AL |
83 | } |
84 | ||
6c27a0de | 85 | int qemu_mutex_trylock_impl(QemuMutex *mutex, const char *file, const int line) |
e5d355d1 | 86 | { |
31f5a726 JRZ |
87 | int err; |
88 | ||
c096358e | 89 | assert(mutex->initialized); |
31f5a726 JRZ |
90 | err = pthread_mutex_trylock(&mutex->lock); |
91 | if (err == 0) { | |
f1aff7aa | 92 | qemu_mutex_post_lock(mutex, file, line); |
31f5a726 JRZ |
93 | return 0; |
94 | } | |
95 | if (err != EBUSY) { | |
96 | error_exit(err, __func__); | |
97 | } | |
98 | return -EBUSY; | |
e5d355d1 AL |
99 | } |
100 | ||
6c27a0de | 101 | void qemu_mutex_unlock_impl(QemuMutex *mutex, const char *file, const int line) |
e5d355d1 AL |
102 | { |
103 | int err; | |
104 | ||
c096358e | 105 | assert(mutex->initialized); |
f1aff7aa | 106 | qemu_mutex_pre_unlock(mutex, file, line); |
e5d355d1 AL |
107 | err = pthread_mutex_unlock(&mutex->lock); |
108 | if (err) | |
109 | error_exit(err, __func__); | |
110 | } | |
111 | ||
feadec63 PB |
112 | void qemu_rec_mutex_init(QemuRecMutex *mutex) |
113 | { | |
114 | int err; | |
115 | pthread_mutexattr_t attr; | |
116 | ||
117 | pthread_mutexattr_init(&attr); | |
118 | pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); | |
6c98635e | 119 | err = pthread_mutex_init(&mutex->m.lock, &attr); |
feadec63 PB |
120 | pthread_mutexattr_destroy(&attr); |
121 | if (err) { | |
122 | error_exit(err, __func__); | |
123 | } | |
6c98635e | 124 | mutex->m.initialized = true; |
feadec63 PB |
125 | } |
126 | ||
4b193bb7 RH |
127 | void qemu_rec_mutex_destroy(QemuRecMutex *mutex) |
128 | { | |
6c98635e | 129 | qemu_mutex_destroy(&mutex->m); |
4b193bb7 RH |
130 | } |
131 | ||
132 | void qemu_rec_mutex_lock_impl(QemuRecMutex *mutex, const char *file, int line) | |
133 | { | |
6c98635e | 134 | qemu_mutex_lock_impl(&mutex->m, file, line); |
4b193bb7 RH |
135 | } |
136 | ||
137 | int qemu_rec_mutex_trylock_impl(QemuRecMutex *mutex, const char *file, int line) | |
138 | { | |
6c98635e | 139 | return qemu_mutex_trylock_impl(&mutex->m, file, line); |
4b193bb7 RH |
140 | } |
141 | ||
9c75bae7 | 142 | void qemu_rec_mutex_unlock_impl(QemuRecMutex *mutex, const char *file, int line) |
4b193bb7 | 143 | { |
6c98635e | 144 | qemu_mutex_unlock_impl(&mutex->m, file, line); |
4b193bb7 RH |
145 | } |
146 | ||
e5d355d1 AL |
147 | void qemu_cond_init(QemuCond *cond) |
148 | { | |
149 | int err; | |
150 | ||
151 | err = pthread_cond_init(&cond->cond, NULL); | |
152 | if (err) | |
153 | error_exit(err, __func__); | |
c096358e | 154 | cond->initialized = true; |
e5d355d1 AL |
155 | } |
156 | ||
313b1d69 CC |
157 | void qemu_cond_destroy(QemuCond *cond) |
158 | { | |
159 | int err; | |
160 | ||
c096358e FZ |
161 | assert(cond->initialized); |
162 | cond->initialized = false; | |
313b1d69 CC |
163 | err = pthread_cond_destroy(&cond->cond); |
164 | if (err) | |
165 | error_exit(err, __func__); | |
166 | } | |
167 | ||
e5d355d1 AL |
168 | void qemu_cond_signal(QemuCond *cond) |
169 | { | |
170 | int err; | |
171 | ||
c096358e | 172 | assert(cond->initialized); |
e5d355d1 AL |
173 | err = pthread_cond_signal(&cond->cond); |
174 | if (err) | |
175 | error_exit(err, __func__); | |
176 | } | |
177 | ||
178 | void qemu_cond_broadcast(QemuCond *cond) | |
179 | { | |
180 | int err; | |
181 | ||
c096358e | 182 | assert(cond->initialized); |
e5d355d1 AL |
183 | err = pthread_cond_broadcast(&cond->cond); |
184 | if (err) | |
185 | error_exit(err, __func__); | |
186 | } | |
187 | ||
6c27a0de | 188 | void qemu_cond_wait_impl(QemuCond *cond, QemuMutex *mutex, const char *file, const int line) |
e5d355d1 AL |
189 | { |
190 | int err; | |
191 | ||
c096358e | 192 | assert(cond->initialized); |
f1aff7aa | 193 | qemu_mutex_pre_unlock(mutex, file, line); |
e5d355d1 | 194 | err = pthread_cond_wait(&cond->cond, &mutex->lock); |
f1aff7aa | 195 | qemu_mutex_post_lock(mutex, file, line); |
e5d355d1 AL |
196 | if (err) |
197 | error_exit(err, __func__); | |
198 | } | |
199 | ||
3dcc9c6e YK |
200 | bool qemu_cond_timedwait_impl(QemuCond *cond, QemuMutex *mutex, int ms, |
201 | const char *file, const int line) | |
202 | { | |
203 | int err; | |
204 | struct timespec ts; | |
205 | ||
206 | assert(cond->initialized); | |
207 | trace_qemu_mutex_unlock(mutex, file, line); | |
208 | compute_abs_deadline(&ts, ms); | |
209 | err = pthread_cond_timedwait(&cond->cond, &mutex->lock, &ts); | |
210 | trace_qemu_mutex_locked(mutex, file, line); | |
211 | if (err && err != ETIMEDOUT) { | |
212 | error_exit(err, __func__); | |
213 | } | |
214 | return err != ETIMEDOUT; | |
215 | } | |
216 | ||
38b14db3 PB |
217 | void qemu_sem_init(QemuSemaphore *sem, int init) |
218 | { | |
219 | int rc; | |
220 | ||
401bc051 | 221 | #ifndef CONFIG_SEM_TIMEDWAIT |
c166cb72 PB |
222 | rc = pthread_mutex_init(&sem->lock, NULL); |
223 | if (rc != 0) { | |
224 | error_exit(rc, __func__); | |
225 | } | |
226 | rc = pthread_cond_init(&sem->cond, NULL); | |
227 | if (rc != 0) { | |
228 | error_exit(rc, __func__); | |
229 | } | |
230 | if (init < 0) { | |
231 | error_exit(EINVAL, __func__); | |
232 | } | |
233 | sem->count = init; | |
234 | #else | |
38b14db3 PB |
235 | rc = sem_init(&sem->sem, 0, init); |
236 | if (rc < 0) { | |
237 | error_exit(errno, __func__); | |
238 | } | |
c166cb72 | 239 | #endif |
c096358e | 240 | sem->initialized = true; |
38b14db3 PB |
241 | } |
242 | ||
243 | void qemu_sem_destroy(QemuSemaphore *sem) | |
244 | { | |
245 | int rc; | |
246 | ||
c096358e FZ |
247 | assert(sem->initialized); |
248 | sem->initialized = false; | |
401bc051 | 249 | #ifndef CONFIG_SEM_TIMEDWAIT |
c166cb72 PB |
250 | rc = pthread_cond_destroy(&sem->cond); |
251 | if (rc < 0) { | |
252 | error_exit(rc, __func__); | |
253 | } | |
254 | rc = pthread_mutex_destroy(&sem->lock); | |
255 | if (rc < 0) { | |
256 | error_exit(rc, __func__); | |
257 | } | |
258 | #else | |
38b14db3 PB |
259 | rc = sem_destroy(&sem->sem); |
260 | if (rc < 0) { | |
261 | error_exit(errno, __func__); | |
262 | } | |
c166cb72 | 263 | #endif |
38b14db3 PB |
264 | } |
265 | ||
266 | void qemu_sem_post(QemuSemaphore *sem) | |
267 | { | |
268 | int rc; | |
269 | ||
c096358e | 270 | assert(sem->initialized); |
401bc051 | 271 | #ifndef CONFIG_SEM_TIMEDWAIT |
c166cb72 | 272 | pthread_mutex_lock(&sem->lock); |
79761c66 | 273 | if (sem->count == UINT_MAX) { |
c166cb72 | 274 | rc = EINVAL; |
c166cb72 | 275 | } else { |
79761c66 IT |
276 | sem->count++; |
277 | rc = pthread_cond_signal(&sem->cond); | |
c166cb72 PB |
278 | } |
279 | pthread_mutex_unlock(&sem->lock); | |
280 | if (rc != 0) { | |
281 | error_exit(rc, __func__); | |
282 | } | |
283 | #else | |
38b14db3 PB |
284 | rc = sem_post(&sem->sem); |
285 | if (rc < 0) { | |
286 | error_exit(errno, __func__); | |
287 | } | |
c166cb72 PB |
288 | #endif |
289 | } | |
290 | ||
38b14db3 PB |
291 | int qemu_sem_timedwait(QemuSemaphore *sem, int ms) |
292 | { | |
293 | int rc; | |
c166cb72 PB |
294 | struct timespec ts; |
295 | ||
c096358e | 296 | assert(sem->initialized); |
401bc051 | 297 | #ifndef CONFIG_SEM_TIMEDWAIT |
79761c66 | 298 | rc = 0; |
c166cb72 PB |
299 | compute_abs_deadline(&ts, ms); |
300 | pthread_mutex_lock(&sem->lock); | |
79761c66 | 301 | while (sem->count == 0) { |
c166cb72 PB |
302 | rc = pthread_cond_timedwait(&sem->cond, &sem->lock, &ts); |
303 | if (rc == ETIMEDOUT) { | |
304 | break; | |
305 | } | |
306 | if (rc != 0) { | |
307 | error_exit(rc, __func__); | |
308 | } | |
309 | } | |
79761c66 IT |
310 | if (rc != ETIMEDOUT) { |
311 | --sem->count; | |
312 | } | |
c166cb72 PB |
313 | pthread_mutex_unlock(&sem->lock); |
314 | return (rc == ETIMEDOUT ? -1 : 0); | |
315 | #else | |
38b14db3 PB |
316 | if (ms <= 0) { |
317 | /* This is cheaper than sem_timedwait. */ | |
318 | do { | |
319 | rc = sem_trywait(&sem->sem); | |
320 | } while (rc == -1 && errno == EINTR); | |
321 | if (rc == -1 && errno == EAGAIN) { | |
322 | return -1; | |
323 | } | |
324 | } else { | |
c166cb72 | 325 | compute_abs_deadline(&ts, ms); |
38b14db3 PB |
326 | do { |
327 | rc = sem_timedwait(&sem->sem, &ts); | |
328 | } while (rc == -1 && errno == EINTR); | |
329 | if (rc == -1 && errno == ETIMEDOUT) { | |
330 | return -1; | |
331 | } | |
332 | } | |
333 | if (rc < 0) { | |
334 | error_exit(errno, __func__); | |
335 | } | |
336 | return 0; | |
c166cb72 | 337 | #endif |
38b14db3 PB |
338 | } |
339 | ||
340 | void qemu_sem_wait(QemuSemaphore *sem) | |
341 | { | |
79761c66 IT |
342 | int rc; |
343 | ||
c096358e | 344 | assert(sem->initialized); |
401bc051 | 345 | #ifndef CONFIG_SEM_TIMEDWAIT |
c166cb72 | 346 | pthread_mutex_lock(&sem->lock); |
79761c66 IT |
347 | while (sem->count == 0) { |
348 | rc = pthread_cond_wait(&sem->cond, &sem->lock); | |
349 | if (rc != 0) { | |
350 | error_exit(rc, __func__); | |
351 | } | |
c166cb72 | 352 | } |
79761c66 | 353 | --sem->count; |
c166cb72 PB |
354 | pthread_mutex_unlock(&sem->lock); |
355 | #else | |
38b14db3 PB |
356 | do { |
357 | rc = sem_wait(&sem->sem); | |
358 | } while (rc == -1 && errno == EINTR); | |
359 | if (rc < 0) { | |
360 | error_exit(errno, __func__); | |
361 | } | |
c166cb72 | 362 | #endif |
38b14db3 PB |
363 | } |
364 | ||
c7c4d063 | 365 | #ifdef __linux__ |
fbcc3e50 | 366 | #include "qemu/futex.h" |
c7c4d063 | 367 | #else |
fbcc3e50 | 368 | static inline void qemu_futex_wake(QemuEvent *ev, int n) |
c7c4d063 | 369 | { |
c096358e | 370 | assert(ev->initialized); |
158ef8cb | 371 | pthread_mutex_lock(&ev->lock); |
c7c4d063 PB |
372 | if (n == 1) { |
373 | pthread_cond_signal(&ev->cond); | |
374 | } else { | |
375 | pthread_cond_broadcast(&ev->cond); | |
376 | } | |
158ef8cb | 377 | pthread_mutex_unlock(&ev->lock); |
c7c4d063 PB |
378 | } |
379 | ||
fbcc3e50 | 380 | static inline void qemu_futex_wait(QemuEvent *ev, unsigned val) |
c7c4d063 | 381 | { |
c096358e | 382 | assert(ev->initialized); |
c7c4d063 PB |
383 | pthread_mutex_lock(&ev->lock); |
384 | if (ev->value == val) { | |
385 | pthread_cond_wait(&ev->cond, &ev->lock); | |
386 | } | |
387 | pthread_mutex_unlock(&ev->lock); | |
388 | } | |
389 | #endif | |
390 | ||
391 | /* Valid transitions: | |
392 | * - free->set, when setting the event | |
fbcc3e50 | 393 | * - busy->set, when setting the event, followed by qemu_futex_wake |
c7c4d063 PB |
394 | * - set->free, when resetting the event |
395 | * - free->busy, when waiting | |
396 | * | |
397 | * set->busy does not happen (it can be observed from the outside but | |
398 | * it really is set->free->busy). | |
399 | * | |
400 | * busy->free provably cannot happen; to enforce it, the set->free transition | |
401 | * is done with an OR, which becomes a no-op if the event has concurrently | |
402 | * transitioned to free or busy. | |
403 | */ | |
404 | ||
405 | #define EV_SET 0 | |
406 | #define EV_FREE 1 | |
407 | #define EV_BUSY -1 | |
408 | ||
409 | void qemu_event_init(QemuEvent *ev, bool init) | |
410 | { | |
411 | #ifndef __linux__ | |
412 | pthread_mutex_init(&ev->lock, NULL); | |
413 | pthread_cond_init(&ev->cond, NULL); | |
414 | #endif | |
415 | ||
416 | ev->value = (init ? EV_SET : EV_FREE); | |
c096358e | 417 | ev->initialized = true; |
c7c4d063 PB |
418 | } |
419 | ||
420 | void qemu_event_destroy(QemuEvent *ev) | |
421 | { | |
c096358e FZ |
422 | assert(ev->initialized); |
423 | ev->initialized = false; | |
c7c4d063 PB |
424 | #ifndef __linux__ |
425 | pthread_mutex_destroy(&ev->lock); | |
426 | pthread_cond_destroy(&ev->cond); | |
427 | #endif | |
428 | } | |
429 | ||
430 | void qemu_event_set(QemuEvent *ev) | |
431 | { | |
374293ca PB |
432 | /* qemu_event_set has release semantics, but because it *loads* |
433 | * ev->value we need a full memory barrier here. | |
434 | */ | |
c096358e | 435 | assert(ev->initialized); |
374293ca | 436 | smp_mb(); |
d73415a3 SH |
437 | if (qatomic_read(&ev->value) != EV_SET) { |
438 | if (qatomic_xchg(&ev->value, EV_SET) == EV_BUSY) { | |
c7c4d063 | 439 | /* There were waiters, wake them up. */ |
fbcc3e50 | 440 | qemu_futex_wake(ev, INT_MAX); |
c7c4d063 PB |
441 | } |
442 | } | |
443 | } | |
444 | ||
445 | void qemu_event_reset(QemuEvent *ev) | |
446 | { | |
374293ca PB |
447 | unsigned value; |
448 | ||
c096358e | 449 | assert(ev->initialized); |
d73415a3 | 450 | value = qatomic_read(&ev->value); |
374293ca PB |
451 | smp_mb_acquire(); |
452 | if (value == EV_SET) { | |
c7c4d063 PB |
453 | /* |
454 | * If there was a concurrent reset (or even reset+wait), | |
455 | * do nothing. Otherwise change EV_SET->EV_FREE. | |
456 | */ | |
d73415a3 | 457 | qatomic_or(&ev->value, EV_FREE); |
c7c4d063 PB |
458 | } |
459 | } | |
460 | ||
461 | void qemu_event_wait(QemuEvent *ev) | |
462 | { | |
463 | unsigned value; | |
464 | ||
c096358e | 465 | assert(ev->initialized); |
d73415a3 | 466 | value = qatomic_read(&ev->value); |
374293ca | 467 | smp_mb_acquire(); |
c7c4d063 PB |
468 | if (value != EV_SET) { |
469 | if (value == EV_FREE) { | |
470 | /* | |
471 | * Leave the event reset and tell qemu_event_set that there | |
472 | * are waiters. No need to retry, because there cannot be | |
67cc32eb | 473 | * a concurrent busy->free transition. After the CAS, the |
c7c4d063 PB |
474 | * event will be either set or busy. |
475 | */ | |
d73415a3 | 476 | if (qatomic_cmpxchg(&ev->value, EV_FREE, EV_BUSY) == EV_SET) { |
c7c4d063 PB |
477 | return; |
478 | } | |
479 | } | |
fbcc3e50 | 480 | qemu_futex_wait(ev, EV_BUSY); |
c7c4d063 PB |
481 | } |
482 | } | |
483 | ||
a458774a | 484 | static __thread NotifierList thread_exit; |
ef57137f | 485 | |
a458774a PM |
486 | /* |
487 | * Note that in this implementation you can register a thread-exit | |
488 | * notifier for the main thread, but it will never be called. | |
489 | * This is OK because main thread exit can only happen when the | |
490 | * entire process is exiting, and the API allows notifiers to not | |
491 | * be called on process exit. | |
492 | */ | |
ef57137f PB |
493 | void qemu_thread_atexit_add(Notifier *notifier) |
494 | { | |
a458774a | 495 | notifier_list_add(&thread_exit, notifier); |
ef57137f PB |
496 | } |
497 | ||
498 | void qemu_thread_atexit_remove(Notifier *notifier) | |
499 | { | |
ef57137f | 500 | notifier_remove(notifier); |
ef57137f PB |
501 | } |
502 | ||
a458774a | 503 | static void qemu_thread_atexit_notify(void *arg) |
ef57137f | 504 | { |
a458774a PM |
505 | /* |
506 | * Called when non-main thread exits (via qemu_thread_exit() | |
507 | * or by returning from its start routine.) | |
508 | */ | |
509 | notifier_list_notify(&thread_exit, NULL); | |
ef57137f PB |
510 | } |
511 | ||
68a93982 | 512 | typedef struct { |
513 | void *(*start_routine)(void *); | |
514 | void *arg; | |
515 | char *name; | |
516 | } QemuThreadArgs; | |
517 | ||
518 | static void *qemu_thread_start(void *args) | |
519 | { | |
520 | QemuThreadArgs *qemu_thread_args = args; | |
521 | void *(*start_routine)(void *) = qemu_thread_args->start_routine; | |
522 | void *arg = qemu_thread_args->arg; | |
a458774a | 523 | void *r; |
68a93982 | 524 | |
479a5747 | 525 | #ifdef CONFIG_THREAD_SETNAME_BYTHREAD |
68a93982 | 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 PX |
535 | } |
536 | #endif | |
ce9f0e5b | 537 | QEMU_TSAN_ANNOTATE_THREAD_NAME(qemu_thread_args->name); |
68a93982 | 538 | g_free(qemu_thread_args->name); |
539 | g_free(qemu_thread_args); | |
37daf1ba RH |
540 | |
541 | /* | |
542 | * GCC 11 with glibc 2.17 on PowerPC reports | |
543 | * | |
544 | * qemu-thread-posix.c:540:5: error: ‘__sigsetjmp’ accessing 656 bytes | |
545 | * in a region of size 528 [-Werror=stringop-overflow=] | |
546 | * 540 | pthread_cleanup_push(qemu_thread_atexit_notify, NULL); | |
547 | * | ^~~~~~~~~~~~~~~~~~~~ | |
548 | * | |
549 | * which is clearly nonsense. | |
550 | */ | |
551 | #pragma GCC diagnostic push | |
552 | #ifndef __clang__ | |
553 | #pragma GCC diagnostic ignored "-Wstringop-overflow" | |
554 | #endif | |
555 | ||
a458774a PM |
556 | pthread_cleanup_push(qemu_thread_atexit_notify, NULL); |
557 | r = start_routine(arg); | |
558 | pthread_cleanup_pop(1); | |
37daf1ba RH |
559 | |
560 | #pragma GCC diagnostic pop | |
561 | ||
a458774a | 562 | return r; |
5c312079 DDAG |
563 | } |
564 | ||
4900116e | 565 | void qemu_thread_create(QemuThread *thread, const char *name, |
e5d355d1 | 566 | void *(*start_routine)(void*), |
cf218714 | 567 | void *arg, int mode) |
e5d355d1 | 568 | { |
cf218714 | 569 | sigset_t set, oldset; |
e5d355d1 | 570 | int err; |
8763046b | 571 | pthread_attr_t attr; |
d820fa5b | 572 | QemuThreadArgs *qemu_thread_args; |
e5d355d1 | 573 | |
8763046b JK |
574 | err = pthread_attr_init(&attr); |
575 | if (err) { | |
576 | error_exit(err, __func__); | |
577 | } | |
55541c8a | 578 | |
68a93982 | 579 | if (mode == QEMU_THREAD_DETACHED) { |
580 | pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
581 | } | |
582 | ||
cf218714 | 583 | /* Leave signal handling to the iothread. */ |
55541c8a | 584 | sigfillset(&set); |
21a43af0 RB |
585 | /* Blocking the signals can result in undefined behaviour. */ |
586 | sigdelset(&set, SIGSEGV); | |
587 | sigdelset(&set, SIGFPE); | |
588 | sigdelset(&set, SIGILL); | |
589 | /* TODO avoid SIGBUS loss on macOS */ | |
55541c8a | 590 | pthread_sigmask(SIG_SETMASK, &set, &oldset); |
55541c8a | 591 | |
d820fa5b PX |
592 | qemu_thread_args = g_new0(QemuThreadArgs, 1); |
593 | qemu_thread_args->name = g_strdup(name); | |
594 | qemu_thread_args->start_routine = start_routine; | |
595 | qemu_thread_args->arg = arg; | |
596 | ||
597 | err = pthread_create(&thread->thread, &attr, | |
598 | qemu_thread_start, qemu_thread_args); | |
4900116e | 599 | |
68a93982 | 600 | if (err) |
601 | error_exit(err, __func__); | |
602 | ||
55541c8a | 603 | pthread_sigmask(SIG_SETMASK, &oldset, NULL); |
8763046b JK |
604 | |
605 | pthread_attr_destroy(&attr); | |
e5d355d1 AL |
606 | } |
607 | ||
b7680cb6 | 608 | void qemu_thread_get_self(QemuThread *thread) |
e5d355d1 AL |
609 | { |
610 | thread->thread = pthread_self(); | |
611 | } | |
612 | ||
2d797b65 | 613 | bool qemu_thread_is_self(QemuThread *thread) |
e5d355d1 | 614 | { |
b7680cb6 | 615 | return pthread_equal(pthread_self(), thread->thread); |
e5d355d1 AL |
616 | } |
617 | ||
313b1d69 CC |
618 | void qemu_thread_exit(void *retval) |
619 | { | |
620 | pthread_exit(retval); | |
621 | } | |
8763046b JK |
622 | |
623 | void *qemu_thread_join(QemuThread *thread) | |
624 | { | |
625 | int err; | |
626 | void *ret; | |
627 | ||
628 | err = pthread_join(thread->thread, &ret); | |
629 | if (err) { | |
630 | error_exit(err, __func__); | |
631 | } | |
632 | return ret; | |
633 | } |