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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 | ||
657ac98b LM |
41 | static inline clockid_t qemu_timedwait_clockid(void) |
42 | { | |
43 | #ifdef CONFIG_PTHREAD_CONDATTR_SETCLOCK | |
44 | return CLOCK_MONOTONIC; | |
45 | #else | |
46 | return CLOCK_REALTIME; | |
47 | #endif | |
48 | } | |
49 | ||
3dcc9c6e YK |
50 | static void compute_abs_deadline(struct timespec *ts, int ms) |
51 | { | |
657ac98b LM |
52 | clock_gettime(qemu_timedwait_clockid(), ts); |
53 | ts->tv_nsec += (ms % 1000) * 1000000; | |
54 | ts->tv_sec += ms / 1000; | |
3dcc9c6e YK |
55 | if (ts->tv_nsec >= 1000000000) { |
56 | ts->tv_sec++; | |
57 | ts->tv_nsec -= 1000000000; | |
58 | } | |
59 | } | |
60 | ||
e5d355d1 AL |
61 | void qemu_mutex_init(QemuMutex *mutex) |
62 | { | |
63 | int err; | |
64 | ||
24fa9049 | 65 | err = pthread_mutex_init(&mutex->lock, NULL); |
e5d355d1 AL |
66 | if (err) |
67 | error_exit(err, __func__); | |
f1aff7aa | 68 | qemu_mutex_post_init(mutex); |
e5d355d1 AL |
69 | } |
70 | ||
313b1d69 CC |
71 | void qemu_mutex_destroy(QemuMutex *mutex) |
72 | { | |
73 | int err; | |
74 | ||
c096358e FZ |
75 | assert(mutex->initialized); |
76 | mutex->initialized = false; | |
313b1d69 CC |
77 | err = pthread_mutex_destroy(&mutex->lock); |
78 | if (err) | |
79 | error_exit(err, __func__); | |
80 | } | |
81 | ||
6c27a0de | 82 | void qemu_mutex_lock_impl(QemuMutex *mutex, const char *file, const int line) |
e5d355d1 AL |
83 | { |
84 | int err; | |
85 | ||
c096358e | 86 | assert(mutex->initialized); |
f1aff7aa | 87 | qemu_mutex_pre_lock(mutex, file, line); |
e5d355d1 AL |
88 | err = pthread_mutex_lock(&mutex->lock); |
89 | if (err) | |
90 | error_exit(err, __func__); | |
f1aff7aa | 91 | qemu_mutex_post_lock(mutex, file, line); |
e5d355d1 AL |
92 | } |
93 | ||
6c27a0de | 94 | int qemu_mutex_trylock_impl(QemuMutex *mutex, const char *file, const int line) |
e5d355d1 | 95 | { |
31f5a726 JRZ |
96 | int err; |
97 | ||
c096358e | 98 | assert(mutex->initialized); |
31f5a726 JRZ |
99 | err = pthread_mutex_trylock(&mutex->lock); |
100 | if (err == 0) { | |
f1aff7aa | 101 | qemu_mutex_post_lock(mutex, file, line); |
31f5a726 JRZ |
102 | return 0; |
103 | } | |
104 | if (err != EBUSY) { | |
105 | error_exit(err, __func__); | |
106 | } | |
107 | return -EBUSY; | |
e5d355d1 AL |
108 | } |
109 | ||
6c27a0de | 110 | void qemu_mutex_unlock_impl(QemuMutex *mutex, const char *file, const int line) |
e5d355d1 AL |
111 | { |
112 | int err; | |
113 | ||
c096358e | 114 | assert(mutex->initialized); |
f1aff7aa | 115 | qemu_mutex_pre_unlock(mutex, file, line); |
e5d355d1 AL |
116 | err = pthread_mutex_unlock(&mutex->lock); |
117 | if (err) | |
118 | error_exit(err, __func__); | |
119 | } | |
120 | ||
feadec63 PB |
121 | void qemu_rec_mutex_init(QemuRecMutex *mutex) |
122 | { | |
123 | int err; | |
124 | pthread_mutexattr_t attr; | |
125 | ||
126 | pthread_mutexattr_init(&attr); | |
127 | pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); | |
6c98635e | 128 | err = pthread_mutex_init(&mutex->m.lock, &attr); |
feadec63 PB |
129 | pthread_mutexattr_destroy(&attr); |
130 | if (err) { | |
131 | error_exit(err, __func__); | |
132 | } | |
6c98635e | 133 | mutex->m.initialized = true; |
feadec63 PB |
134 | } |
135 | ||
4b193bb7 RH |
136 | void qemu_rec_mutex_destroy(QemuRecMutex *mutex) |
137 | { | |
6c98635e | 138 | qemu_mutex_destroy(&mutex->m); |
4b193bb7 RH |
139 | } |
140 | ||
141 | void qemu_rec_mutex_lock_impl(QemuRecMutex *mutex, const char *file, int line) | |
142 | { | |
6c98635e | 143 | qemu_mutex_lock_impl(&mutex->m, file, line); |
4b193bb7 RH |
144 | } |
145 | ||
146 | int qemu_rec_mutex_trylock_impl(QemuRecMutex *mutex, const char *file, int line) | |
147 | { | |
6c98635e | 148 | return qemu_mutex_trylock_impl(&mutex->m, file, line); |
4b193bb7 RH |
149 | } |
150 | ||
9c75bae7 | 151 | void qemu_rec_mutex_unlock_impl(QemuRecMutex *mutex, const char *file, int line) |
4b193bb7 | 152 | { |
6c98635e | 153 | qemu_mutex_unlock_impl(&mutex->m, file, line); |
4b193bb7 RH |
154 | } |
155 | ||
e5d355d1 AL |
156 | void qemu_cond_init(QemuCond *cond) |
157 | { | |
657ac98b | 158 | pthread_condattr_t attr; |
e5d355d1 AL |
159 | int err; |
160 | ||
657ac98b LM |
161 | err = pthread_condattr_init(&attr); |
162 | if (err) { | |
163 | error_exit(err, __func__); | |
164 | } | |
165 | #ifdef CONFIG_PTHREAD_CONDATTR_SETCLOCK | |
166 | err = pthread_condattr_setclock(&attr, qemu_timedwait_clockid()); | |
167 | if (err) { | |
e5d355d1 | 168 | error_exit(err, __func__); |
657ac98b LM |
169 | } |
170 | #endif | |
171 | err = pthread_cond_init(&cond->cond, &attr); | |
172 | if (err) { | |
173 | error_exit(err, __func__); | |
174 | } | |
175 | err = pthread_condattr_destroy(&attr); | |
176 | if (err) { | |
177 | error_exit(err, __func__); | |
178 | } | |
c096358e | 179 | cond->initialized = true; |
e5d355d1 AL |
180 | } |
181 | ||
313b1d69 CC |
182 | void qemu_cond_destroy(QemuCond *cond) |
183 | { | |
184 | int err; | |
185 | ||
c096358e FZ |
186 | assert(cond->initialized); |
187 | cond->initialized = false; | |
313b1d69 CC |
188 | err = pthread_cond_destroy(&cond->cond); |
189 | if (err) | |
190 | error_exit(err, __func__); | |
191 | } | |
192 | ||
e5d355d1 AL |
193 | void qemu_cond_signal(QemuCond *cond) |
194 | { | |
195 | int err; | |
196 | ||
c096358e | 197 | assert(cond->initialized); |
e5d355d1 AL |
198 | err = pthread_cond_signal(&cond->cond); |
199 | if (err) | |
200 | error_exit(err, __func__); | |
201 | } | |
202 | ||
203 | void qemu_cond_broadcast(QemuCond *cond) | |
204 | { | |
205 | int err; | |
206 | ||
c096358e | 207 | assert(cond->initialized); |
e5d355d1 AL |
208 | err = pthread_cond_broadcast(&cond->cond); |
209 | if (err) | |
210 | error_exit(err, __func__); | |
211 | } | |
212 | ||
6c27a0de | 213 | void qemu_cond_wait_impl(QemuCond *cond, QemuMutex *mutex, const char *file, const int line) |
e5d355d1 AL |
214 | { |
215 | int err; | |
216 | ||
c096358e | 217 | assert(cond->initialized); |
f1aff7aa | 218 | qemu_mutex_pre_unlock(mutex, file, line); |
e5d355d1 | 219 | err = pthread_cond_wait(&cond->cond, &mutex->lock); |
f1aff7aa | 220 | qemu_mutex_post_lock(mutex, file, line); |
e5d355d1 AL |
221 | if (err) |
222 | error_exit(err, __func__); | |
223 | } | |
224 | ||
a0d45db8 LM |
225 | static bool |
226 | qemu_cond_timedwait_ts(QemuCond *cond, QemuMutex *mutex, struct timespec *ts, | |
227 | const char *file, const int line) | |
3dcc9c6e YK |
228 | { |
229 | int err; | |
3dcc9c6e YK |
230 | |
231 | assert(cond->initialized); | |
232 | trace_qemu_mutex_unlock(mutex, file, line); | |
a0d45db8 | 233 | err = pthread_cond_timedwait(&cond->cond, &mutex->lock, ts); |
3dcc9c6e YK |
234 | trace_qemu_mutex_locked(mutex, file, line); |
235 | if (err && err != ETIMEDOUT) { | |
236 | error_exit(err, __func__); | |
237 | } | |
238 | return err != ETIMEDOUT; | |
239 | } | |
240 | ||
a0d45db8 LM |
241 | bool qemu_cond_timedwait_impl(QemuCond *cond, QemuMutex *mutex, int ms, |
242 | const char *file, const int line) | |
243 | { | |
244 | struct timespec ts; | |
245 | ||
246 | compute_abs_deadline(&ts, ms); | |
247 | return qemu_cond_timedwait_ts(cond, mutex, &ts, file, line); | |
248 | } | |
249 | ||
38b14db3 PB |
250 | void qemu_sem_init(QemuSemaphore *sem, int init) |
251 | { | |
a0d45db8 LM |
252 | qemu_mutex_init(&sem->mutex); |
253 | qemu_cond_init(&sem->cond); | |
38b14db3 | 254 | |
c166cb72 PB |
255 | if (init < 0) { |
256 | error_exit(EINVAL, __func__); | |
257 | } | |
258 | sem->count = init; | |
38b14db3 PB |
259 | } |
260 | ||
261 | void qemu_sem_destroy(QemuSemaphore *sem) | |
262 | { | |
a0d45db8 LM |
263 | qemu_cond_destroy(&sem->cond); |
264 | qemu_mutex_destroy(&sem->mutex); | |
38b14db3 PB |
265 | } |
266 | ||
267 | void qemu_sem_post(QemuSemaphore *sem) | |
268 | { | |
a0d45db8 | 269 | qemu_mutex_lock(&sem->mutex); |
79761c66 | 270 | if (sem->count == UINT_MAX) { |
a0d45db8 | 271 | error_exit(EINVAL, __func__); |
c166cb72 | 272 | } else { |
79761c66 | 273 | sem->count++; |
a0d45db8 | 274 | qemu_cond_signal(&sem->cond); |
c166cb72 | 275 | } |
a0d45db8 | 276 | qemu_mutex_unlock(&sem->mutex); |
c166cb72 PB |
277 | } |
278 | ||
38b14db3 PB |
279 | int qemu_sem_timedwait(QemuSemaphore *sem, int ms) |
280 | { | |
a0d45db8 | 281 | bool rc = true; |
c166cb72 PB |
282 | struct timespec ts; |
283 | ||
c166cb72 | 284 | compute_abs_deadline(&ts, ms); |
a0d45db8 | 285 | qemu_mutex_lock(&sem->mutex); |
79761c66 | 286 | while (sem->count == 0) { |
8ab30264 PB |
287 | if (ms == 0) { |
288 | rc = false; | |
289 | } else { | |
290 | rc = qemu_cond_timedwait_ts(&sem->cond, &sem->mutex, &ts, | |
291 | __FILE__, __LINE__); | |
292 | } | |
a0d45db8 | 293 | if (!rc) { /* timeout */ |
c166cb72 PB |
294 | break; |
295 | } | |
c166cb72 | 296 | } |
a0d45db8 | 297 | if (rc) { |
79761c66 IT |
298 | --sem->count; |
299 | } | |
a0d45db8 LM |
300 | qemu_mutex_unlock(&sem->mutex); |
301 | return (rc ? 0 : -1); | |
38b14db3 PB |
302 | } |
303 | ||
304 | void qemu_sem_wait(QemuSemaphore *sem) | |
305 | { | |
a0d45db8 | 306 | qemu_mutex_lock(&sem->mutex); |
79761c66 | 307 | while (sem->count == 0) { |
a0d45db8 | 308 | qemu_cond_wait(&sem->cond, &sem->mutex); |
c166cb72 | 309 | } |
79761c66 | 310 | --sem->count; |
a0d45db8 | 311 | qemu_mutex_unlock(&sem->mutex); |
38b14db3 PB |
312 | } |
313 | ||
c7c4d063 | 314 | #ifdef __linux__ |
fbcc3e50 | 315 | #include "qemu/futex.h" |
c7c4d063 | 316 | #else |
fbcc3e50 | 317 | static inline void qemu_futex_wake(QemuEvent *ev, int n) |
c7c4d063 | 318 | { |
c096358e | 319 | assert(ev->initialized); |
158ef8cb | 320 | pthread_mutex_lock(&ev->lock); |
c7c4d063 PB |
321 | if (n == 1) { |
322 | pthread_cond_signal(&ev->cond); | |
323 | } else { | |
324 | pthread_cond_broadcast(&ev->cond); | |
325 | } | |
158ef8cb | 326 | pthread_mutex_unlock(&ev->lock); |
c7c4d063 PB |
327 | } |
328 | ||
fbcc3e50 | 329 | static inline void qemu_futex_wait(QemuEvent *ev, unsigned val) |
c7c4d063 | 330 | { |
c096358e | 331 | assert(ev->initialized); |
c7c4d063 PB |
332 | pthread_mutex_lock(&ev->lock); |
333 | if (ev->value == val) { | |
334 | pthread_cond_wait(&ev->cond, &ev->lock); | |
335 | } | |
336 | pthread_mutex_unlock(&ev->lock); | |
337 | } | |
338 | #endif | |
339 | ||
340 | /* Valid transitions: | |
341 | * - free->set, when setting the event | |
fbcc3e50 | 342 | * - busy->set, when setting the event, followed by qemu_futex_wake |
c7c4d063 PB |
343 | * - set->free, when resetting the event |
344 | * - free->busy, when waiting | |
345 | * | |
346 | * set->busy does not happen (it can be observed from the outside but | |
347 | * it really is set->free->busy). | |
348 | * | |
349 | * busy->free provably cannot happen; to enforce it, the set->free transition | |
350 | * is done with an OR, which becomes a no-op if the event has concurrently | |
351 | * transitioned to free or busy. | |
352 | */ | |
353 | ||
354 | #define EV_SET 0 | |
355 | #define EV_FREE 1 | |
356 | #define EV_BUSY -1 | |
357 | ||
358 | void qemu_event_init(QemuEvent *ev, bool init) | |
359 | { | |
360 | #ifndef __linux__ | |
361 | pthread_mutex_init(&ev->lock, NULL); | |
362 | pthread_cond_init(&ev->cond, NULL); | |
363 | #endif | |
364 | ||
365 | ev->value = (init ? EV_SET : EV_FREE); | |
c096358e | 366 | ev->initialized = true; |
c7c4d063 PB |
367 | } |
368 | ||
369 | void qemu_event_destroy(QemuEvent *ev) | |
370 | { | |
c096358e FZ |
371 | assert(ev->initialized); |
372 | ev->initialized = false; | |
c7c4d063 PB |
373 | #ifndef __linux__ |
374 | pthread_mutex_destroy(&ev->lock); | |
375 | pthread_cond_destroy(&ev->cond); | |
376 | #endif | |
377 | } | |
378 | ||
379 | void qemu_event_set(QemuEvent *ev) | |
380 | { | |
374293ca PB |
381 | /* qemu_event_set has release semantics, but because it *loads* |
382 | * ev->value we need a full memory barrier here. | |
383 | */ | |
c096358e | 384 | assert(ev->initialized); |
374293ca | 385 | smp_mb(); |
d73415a3 SH |
386 | if (qatomic_read(&ev->value) != EV_SET) { |
387 | if (qatomic_xchg(&ev->value, EV_SET) == EV_BUSY) { | |
c7c4d063 | 388 | /* There were waiters, wake them up. */ |
fbcc3e50 | 389 | qemu_futex_wake(ev, INT_MAX); |
c7c4d063 PB |
390 | } |
391 | } | |
392 | } | |
393 | ||
394 | void qemu_event_reset(QemuEvent *ev) | |
395 | { | |
374293ca PB |
396 | unsigned value; |
397 | ||
c096358e | 398 | assert(ev->initialized); |
d73415a3 | 399 | value = qatomic_read(&ev->value); |
374293ca PB |
400 | smp_mb_acquire(); |
401 | if (value == EV_SET) { | |
c7c4d063 PB |
402 | /* |
403 | * If there was a concurrent reset (or even reset+wait), | |
404 | * do nothing. Otherwise change EV_SET->EV_FREE. | |
405 | */ | |
d73415a3 | 406 | qatomic_or(&ev->value, EV_FREE); |
c7c4d063 PB |
407 | } |
408 | } | |
409 | ||
410 | void qemu_event_wait(QemuEvent *ev) | |
411 | { | |
412 | unsigned value; | |
413 | ||
c096358e | 414 | assert(ev->initialized); |
d73415a3 | 415 | value = qatomic_read(&ev->value); |
374293ca | 416 | smp_mb_acquire(); |
c7c4d063 PB |
417 | if (value != EV_SET) { |
418 | if (value == EV_FREE) { | |
419 | /* | |
420 | * Leave the event reset and tell qemu_event_set that there | |
421 | * are waiters. No need to retry, because there cannot be | |
67cc32eb | 422 | * a concurrent busy->free transition. After the CAS, the |
c7c4d063 PB |
423 | * event will be either set or busy. |
424 | */ | |
d73415a3 | 425 | if (qatomic_cmpxchg(&ev->value, EV_FREE, EV_BUSY) == EV_SET) { |
c7c4d063 PB |
426 | return; |
427 | } | |
428 | } | |
fbcc3e50 | 429 | qemu_futex_wait(ev, EV_BUSY); |
c7c4d063 PB |
430 | } |
431 | } | |
432 | ||
a458774a | 433 | static __thread NotifierList thread_exit; |
ef57137f | 434 | |
a458774a PM |
435 | /* |
436 | * Note that in this implementation you can register a thread-exit | |
437 | * notifier for the main thread, but it will never be called. | |
438 | * This is OK because main thread exit can only happen when the | |
439 | * entire process is exiting, and the API allows notifiers to not | |
440 | * be called on process exit. | |
441 | */ | |
ef57137f PB |
442 | void qemu_thread_atexit_add(Notifier *notifier) |
443 | { | |
a458774a | 444 | notifier_list_add(&thread_exit, notifier); |
ef57137f PB |
445 | } |
446 | ||
447 | void qemu_thread_atexit_remove(Notifier *notifier) | |
448 | { | |
ef57137f | 449 | notifier_remove(notifier); |
ef57137f PB |
450 | } |
451 | ||
a458774a | 452 | static void qemu_thread_atexit_notify(void *arg) |
ef57137f | 453 | { |
a458774a PM |
454 | /* |
455 | * Called when non-main thread exits (via qemu_thread_exit() | |
456 | * or by returning from its start routine.) | |
457 | */ | |
458 | notifier_list_notify(&thread_exit, NULL); | |
ef57137f PB |
459 | } |
460 | ||
68a93982 | 461 | typedef struct { |
462 | void *(*start_routine)(void *); | |
463 | void *arg; | |
464 | char *name; | |
465 | } QemuThreadArgs; | |
466 | ||
467 | static void *qemu_thread_start(void *args) | |
468 | { | |
469 | QemuThreadArgs *qemu_thread_args = args; | |
470 | void *(*start_routine)(void *) = qemu_thread_args->start_routine; | |
471 | void *arg = qemu_thread_args->arg; | |
a458774a | 472 | void *r; |
68a93982 | 473 | |
474 | /* Attempt to set the threads name; note that this is for debug, so | |
475 | * we're not going to fail if we can't set it. | |
476 | */ | |
d820fa5b | 477 | if (name_threads && qemu_thread_args->name) { |
479a5747 | 478 | # if defined(CONFIG_PTHREAD_SETNAME_NP_W_TID) |
d820fa5b | 479 | pthread_setname_np(pthread_self(), qemu_thread_args->name); |
479a5747 RB |
480 | # elif defined(CONFIG_PTHREAD_SETNAME_NP_WO_TID) |
481 | pthread_setname_np(qemu_thread_args->name); | |
482 | # endif | |
d820fa5b | 483 | } |
ce9f0e5b | 484 | QEMU_TSAN_ANNOTATE_THREAD_NAME(qemu_thread_args->name); |
68a93982 | 485 | g_free(qemu_thread_args->name); |
486 | g_free(qemu_thread_args); | |
37daf1ba RH |
487 | |
488 | /* | |
489 | * GCC 11 with glibc 2.17 on PowerPC reports | |
490 | * | |
491 | * qemu-thread-posix.c:540:5: error: ‘__sigsetjmp’ accessing 656 bytes | |
492 | * in a region of size 528 [-Werror=stringop-overflow=] | |
493 | * 540 | pthread_cleanup_push(qemu_thread_atexit_notify, NULL); | |
494 | * | ^~~~~~~~~~~~~~~~~~~~ | |
495 | * | |
496 | * which is clearly nonsense. | |
497 | */ | |
498 | #pragma GCC diagnostic push | |
499 | #ifndef __clang__ | |
500 | #pragma GCC diagnostic ignored "-Wstringop-overflow" | |
501 | #endif | |
502 | ||
a458774a PM |
503 | pthread_cleanup_push(qemu_thread_atexit_notify, NULL); |
504 | r = start_routine(arg); | |
505 | pthread_cleanup_pop(1); | |
37daf1ba RH |
506 | |
507 | #pragma GCC diagnostic pop | |
508 | ||
a458774a | 509 | return r; |
5c312079 DDAG |
510 | } |
511 | ||
4900116e | 512 | void qemu_thread_create(QemuThread *thread, const char *name, |
e5d355d1 | 513 | void *(*start_routine)(void*), |
cf218714 | 514 | void *arg, int mode) |
e5d355d1 | 515 | { |
cf218714 | 516 | sigset_t set, oldset; |
e5d355d1 | 517 | int err; |
8763046b | 518 | pthread_attr_t attr; |
d820fa5b | 519 | QemuThreadArgs *qemu_thread_args; |
e5d355d1 | 520 | |
8763046b JK |
521 | err = pthread_attr_init(&attr); |
522 | if (err) { | |
523 | error_exit(err, __func__); | |
524 | } | |
55541c8a | 525 | |
68a93982 | 526 | if (mode == QEMU_THREAD_DETACHED) { |
527 | pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
528 | } | |
529 | ||
cf218714 | 530 | /* Leave signal handling to the iothread. */ |
55541c8a | 531 | sigfillset(&set); |
21a43af0 RB |
532 | /* Blocking the signals can result in undefined behaviour. */ |
533 | sigdelset(&set, SIGSEGV); | |
534 | sigdelset(&set, SIGFPE); | |
535 | sigdelset(&set, SIGILL); | |
536 | /* TODO avoid SIGBUS loss on macOS */ | |
55541c8a | 537 | pthread_sigmask(SIG_SETMASK, &set, &oldset); |
55541c8a | 538 | |
d820fa5b PX |
539 | qemu_thread_args = g_new0(QemuThreadArgs, 1); |
540 | qemu_thread_args->name = g_strdup(name); | |
541 | qemu_thread_args->start_routine = start_routine; | |
542 | qemu_thread_args->arg = arg; | |
543 | ||
544 | err = pthread_create(&thread->thread, &attr, | |
545 | qemu_thread_start, qemu_thread_args); | |
4900116e | 546 | |
68a93982 | 547 | if (err) |
548 | error_exit(err, __func__); | |
549 | ||
55541c8a | 550 | pthread_sigmask(SIG_SETMASK, &oldset, NULL); |
8763046b JK |
551 | |
552 | pthread_attr_destroy(&attr); | |
e5d355d1 AL |
553 | } |
554 | ||
b7680cb6 | 555 | void qemu_thread_get_self(QemuThread *thread) |
e5d355d1 AL |
556 | { |
557 | thread->thread = pthread_self(); | |
558 | } | |
559 | ||
2d797b65 | 560 | bool qemu_thread_is_self(QemuThread *thread) |
e5d355d1 | 561 | { |
b7680cb6 | 562 | return pthread_equal(pthread_self(), thread->thread); |
e5d355d1 AL |
563 | } |
564 | ||
313b1d69 CC |
565 | void qemu_thread_exit(void *retval) |
566 | { | |
567 | pthread_exit(retval); | |
568 | } | |
8763046b JK |
569 | |
570 | void *qemu_thread_join(QemuThread *thread) | |
571 | { | |
572 | int err; | |
573 | void *ret; | |
574 | ||
575 | err = pthread_join(thread->thread, &ret); | |
576 | if (err) { | |
577 | error_exit(err, __func__); | |
578 | } | |
579 | return ret; | |
580 | } |