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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" |
7730f32c | 19 | #include "qemu/bitmap.h" |
e5d355d1 | 20 | |
8f480de0 DDAG |
21 | static bool name_threads; |
22 | ||
23 | void qemu_thread_naming(bool enable) | |
24 | { | |
25 | name_threads = enable; | |
5c312079 | 26 | |
10f6b231 PB |
27 | #if !defined CONFIG_PTHREAD_SETNAME_NP_W_TID && \ |
28 | !defined CONFIG_PTHREAD_SETNAME_NP_WO_TID | |
5c312079 DDAG |
29 | /* This is a debugging option, not fatal */ |
30 | if (enable) { | |
31 | fprintf(stderr, "qemu: thread naming not supported on this host\n"); | |
32 | } | |
33 | #endif | |
8f480de0 DDAG |
34 | } |
35 | ||
e5d355d1 AL |
36 | static void error_exit(int err, const char *msg) |
37 | { | |
38 | fprintf(stderr, "qemu: %s: %s\n", msg, strerror(err)); | |
53380ac3 | 39 | abort(); |
e5d355d1 AL |
40 | } |
41 | ||
657ac98b LM |
42 | static inline clockid_t qemu_timedwait_clockid(void) |
43 | { | |
44 | #ifdef CONFIG_PTHREAD_CONDATTR_SETCLOCK | |
45 | return CLOCK_MONOTONIC; | |
46 | #else | |
47 | return CLOCK_REALTIME; | |
48 | #endif | |
49 | } | |
50 | ||
3dcc9c6e YK |
51 | static void compute_abs_deadline(struct timespec *ts, int ms) |
52 | { | |
657ac98b LM |
53 | clock_gettime(qemu_timedwait_clockid(), ts); |
54 | ts->tv_nsec += (ms % 1000) * 1000000; | |
55 | ts->tv_sec += ms / 1000; | |
3dcc9c6e YK |
56 | if (ts->tv_nsec >= 1000000000) { |
57 | ts->tv_sec++; | |
58 | ts->tv_nsec -= 1000000000; | |
59 | } | |
60 | } | |
61 | ||
e5d355d1 AL |
62 | void qemu_mutex_init(QemuMutex *mutex) |
63 | { | |
64 | int err; | |
65 | ||
24fa9049 | 66 | err = pthread_mutex_init(&mutex->lock, NULL); |
e5d355d1 AL |
67 | if (err) |
68 | error_exit(err, __func__); | |
f1aff7aa | 69 | qemu_mutex_post_init(mutex); |
e5d355d1 AL |
70 | } |
71 | ||
313b1d69 CC |
72 | void qemu_mutex_destroy(QemuMutex *mutex) |
73 | { | |
74 | int err; | |
75 | ||
c096358e FZ |
76 | assert(mutex->initialized); |
77 | mutex->initialized = false; | |
313b1d69 CC |
78 | err = pthread_mutex_destroy(&mutex->lock); |
79 | if (err) | |
80 | error_exit(err, __func__); | |
81 | } | |
82 | ||
6c27a0de | 83 | void qemu_mutex_lock_impl(QemuMutex *mutex, const char *file, const int line) |
e5d355d1 AL |
84 | { |
85 | int err; | |
86 | ||
c096358e | 87 | assert(mutex->initialized); |
f1aff7aa | 88 | qemu_mutex_pre_lock(mutex, file, line); |
e5d355d1 AL |
89 | err = pthread_mutex_lock(&mutex->lock); |
90 | if (err) | |
91 | error_exit(err, __func__); | |
f1aff7aa | 92 | qemu_mutex_post_lock(mutex, file, line); |
e5d355d1 AL |
93 | } |
94 | ||
6c27a0de | 95 | int qemu_mutex_trylock_impl(QemuMutex *mutex, const char *file, const int line) |
e5d355d1 | 96 | { |
31f5a726 JRZ |
97 | int err; |
98 | ||
c096358e | 99 | assert(mutex->initialized); |
31f5a726 JRZ |
100 | err = pthread_mutex_trylock(&mutex->lock); |
101 | if (err == 0) { | |
f1aff7aa | 102 | qemu_mutex_post_lock(mutex, file, line); |
31f5a726 JRZ |
103 | return 0; |
104 | } | |
105 | if (err != EBUSY) { | |
106 | error_exit(err, __func__); | |
107 | } | |
108 | return -EBUSY; | |
e5d355d1 AL |
109 | } |
110 | ||
6c27a0de | 111 | void qemu_mutex_unlock_impl(QemuMutex *mutex, const char *file, const int line) |
e5d355d1 AL |
112 | { |
113 | int err; | |
114 | ||
c096358e | 115 | assert(mutex->initialized); |
f1aff7aa | 116 | qemu_mutex_pre_unlock(mutex, file, line); |
e5d355d1 AL |
117 | err = pthread_mutex_unlock(&mutex->lock); |
118 | if (err) | |
119 | error_exit(err, __func__); | |
120 | } | |
121 | ||
feadec63 PB |
122 | void qemu_rec_mutex_init(QemuRecMutex *mutex) |
123 | { | |
124 | int err; | |
125 | pthread_mutexattr_t attr; | |
126 | ||
127 | pthread_mutexattr_init(&attr); | |
128 | pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); | |
6c98635e | 129 | err = pthread_mutex_init(&mutex->m.lock, &attr); |
feadec63 PB |
130 | pthread_mutexattr_destroy(&attr); |
131 | if (err) { | |
132 | error_exit(err, __func__); | |
133 | } | |
6c98635e | 134 | mutex->m.initialized = true; |
feadec63 PB |
135 | } |
136 | ||
4b193bb7 RH |
137 | void qemu_rec_mutex_destroy(QemuRecMutex *mutex) |
138 | { | |
6c98635e | 139 | qemu_mutex_destroy(&mutex->m); |
4b193bb7 RH |
140 | } |
141 | ||
142 | void qemu_rec_mutex_lock_impl(QemuRecMutex *mutex, const char *file, int line) | |
143 | { | |
6c98635e | 144 | qemu_mutex_lock_impl(&mutex->m, file, line); |
4b193bb7 RH |
145 | } |
146 | ||
147 | int qemu_rec_mutex_trylock_impl(QemuRecMutex *mutex, const char *file, int line) | |
148 | { | |
6c98635e | 149 | return qemu_mutex_trylock_impl(&mutex->m, file, line); |
4b193bb7 RH |
150 | } |
151 | ||
9c75bae7 | 152 | void qemu_rec_mutex_unlock_impl(QemuRecMutex *mutex, const char *file, int line) |
4b193bb7 | 153 | { |
6c98635e | 154 | qemu_mutex_unlock_impl(&mutex->m, file, line); |
4b193bb7 RH |
155 | } |
156 | ||
e5d355d1 AL |
157 | void qemu_cond_init(QemuCond *cond) |
158 | { | |
657ac98b | 159 | pthread_condattr_t attr; |
e5d355d1 AL |
160 | int err; |
161 | ||
657ac98b LM |
162 | err = pthread_condattr_init(&attr); |
163 | if (err) { | |
164 | error_exit(err, __func__); | |
165 | } | |
166 | #ifdef CONFIG_PTHREAD_CONDATTR_SETCLOCK | |
167 | err = pthread_condattr_setclock(&attr, qemu_timedwait_clockid()); | |
168 | if (err) { | |
e5d355d1 | 169 | error_exit(err, __func__); |
657ac98b LM |
170 | } |
171 | #endif | |
172 | err = pthread_cond_init(&cond->cond, &attr); | |
173 | if (err) { | |
174 | error_exit(err, __func__); | |
175 | } | |
176 | err = pthread_condattr_destroy(&attr); | |
177 | if (err) { | |
178 | error_exit(err, __func__); | |
179 | } | |
c096358e | 180 | cond->initialized = true; |
e5d355d1 AL |
181 | } |
182 | ||
313b1d69 CC |
183 | void qemu_cond_destroy(QemuCond *cond) |
184 | { | |
185 | int err; | |
186 | ||
c096358e FZ |
187 | assert(cond->initialized); |
188 | cond->initialized = false; | |
313b1d69 CC |
189 | err = pthread_cond_destroy(&cond->cond); |
190 | if (err) | |
191 | error_exit(err, __func__); | |
192 | } | |
193 | ||
e5d355d1 AL |
194 | void qemu_cond_signal(QemuCond *cond) |
195 | { | |
196 | int err; | |
197 | ||
c096358e | 198 | assert(cond->initialized); |
e5d355d1 AL |
199 | err = pthread_cond_signal(&cond->cond); |
200 | if (err) | |
201 | error_exit(err, __func__); | |
202 | } | |
203 | ||
204 | void qemu_cond_broadcast(QemuCond *cond) | |
205 | { | |
206 | int err; | |
207 | ||
c096358e | 208 | assert(cond->initialized); |
e5d355d1 AL |
209 | err = pthread_cond_broadcast(&cond->cond); |
210 | if (err) | |
211 | error_exit(err, __func__); | |
212 | } | |
213 | ||
6c27a0de | 214 | void qemu_cond_wait_impl(QemuCond *cond, QemuMutex *mutex, const char *file, const int line) |
e5d355d1 AL |
215 | { |
216 | int err; | |
217 | ||
c096358e | 218 | assert(cond->initialized); |
f1aff7aa | 219 | qemu_mutex_pre_unlock(mutex, file, line); |
e5d355d1 | 220 | err = pthread_cond_wait(&cond->cond, &mutex->lock); |
f1aff7aa | 221 | qemu_mutex_post_lock(mutex, file, line); |
e5d355d1 AL |
222 | if (err) |
223 | error_exit(err, __func__); | |
224 | } | |
225 | ||
a0d45db8 LM |
226 | static bool |
227 | qemu_cond_timedwait_ts(QemuCond *cond, QemuMutex *mutex, struct timespec *ts, | |
228 | const char *file, const int line) | |
3dcc9c6e YK |
229 | { |
230 | int err; | |
3dcc9c6e YK |
231 | |
232 | assert(cond->initialized); | |
233 | trace_qemu_mutex_unlock(mutex, file, line); | |
a0d45db8 | 234 | err = pthread_cond_timedwait(&cond->cond, &mutex->lock, ts); |
3dcc9c6e YK |
235 | trace_qemu_mutex_locked(mutex, file, line); |
236 | if (err && err != ETIMEDOUT) { | |
237 | error_exit(err, __func__); | |
238 | } | |
239 | return err != ETIMEDOUT; | |
240 | } | |
241 | ||
a0d45db8 LM |
242 | bool qemu_cond_timedwait_impl(QemuCond *cond, QemuMutex *mutex, int ms, |
243 | const char *file, const int line) | |
244 | { | |
245 | struct timespec ts; | |
246 | ||
247 | compute_abs_deadline(&ts, ms); | |
248 | return qemu_cond_timedwait_ts(cond, mutex, &ts, file, line); | |
249 | } | |
250 | ||
38b14db3 PB |
251 | void qemu_sem_init(QemuSemaphore *sem, int init) |
252 | { | |
a0d45db8 LM |
253 | qemu_mutex_init(&sem->mutex); |
254 | qemu_cond_init(&sem->cond); | |
38b14db3 | 255 | |
c166cb72 PB |
256 | if (init < 0) { |
257 | error_exit(EINVAL, __func__); | |
258 | } | |
259 | sem->count = init; | |
38b14db3 PB |
260 | } |
261 | ||
262 | void qemu_sem_destroy(QemuSemaphore *sem) | |
263 | { | |
a0d45db8 LM |
264 | qemu_cond_destroy(&sem->cond); |
265 | qemu_mutex_destroy(&sem->mutex); | |
38b14db3 PB |
266 | } |
267 | ||
268 | void qemu_sem_post(QemuSemaphore *sem) | |
269 | { | |
a0d45db8 | 270 | qemu_mutex_lock(&sem->mutex); |
79761c66 | 271 | if (sem->count == UINT_MAX) { |
a0d45db8 | 272 | error_exit(EINVAL, __func__); |
c166cb72 | 273 | } else { |
79761c66 | 274 | sem->count++; |
a0d45db8 | 275 | qemu_cond_signal(&sem->cond); |
c166cb72 | 276 | } |
a0d45db8 | 277 | qemu_mutex_unlock(&sem->mutex); |
c166cb72 PB |
278 | } |
279 | ||
38b14db3 PB |
280 | int qemu_sem_timedwait(QemuSemaphore *sem, int ms) |
281 | { | |
a0d45db8 | 282 | bool rc = true; |
c166cb72 PB |
283 | struct timespec ts; |
284 | ||
c166cb72 | 285 | compute_abs_deadline(&ts, ms); |
a0d45db8 | 286 | qemu_mutex_lock(&sem->mutex); |
79761c66 | 287 | while (sem->count == 0) { |
8ab30264 PB |
288 | if (ms == 0) { |
289 | rc = false; | |
290 | } else { | |
291 | rc = qemu_cond_timedwait_ts(&sem->cond, &sem->mutex, &ts, | |
292 | __FILE__, __LINE__); | |
293 | } | |
a0d45db8 | 294 | if (!rc) { /* timeout */ |
c166cb72 PB |
295 | break; |
296 | } | |
c166cb72 | 297 | } |
a0d45db8 | 298 | if (rc) { |
79761c66 IT |
299 | --sem->count; |
300 | } | |
a0d45db8 LM |
301 | qemu_mutex_unlock(&sem->mutex); |
302 | return (rc ? 0 : -1); | |
38b14db3 PB |
303 | } |
304 | ||
305 | void qemu_sem_wait(QemuSemaphore *sem) | |
306 | { | |
a0d45db8 | 307 | qemu_mutex_lock(&sem->mutex); |
79761c66 | 308 | while (sem->count == 0) { |
a0d45db8 | 309 | qemu_cond_wait(&sem->cond, &sem->mutex); |
c166cb72 | 310 | } |
79761c66 | 311 | --sem->count; |
a0d45db8 | 312 | qemu_mutex_unlock(&sem->mutex); |
38b14db3 PB |
313 | } |
314 | ||
c7c4d063 | 315 | #ifdef __linux__ |
fbcc3e50 | 316 | #include "qemu/futex.h" |
c7c4d063 | 317 | #else |
fbcc3e50 | 318 | static inline void qemu_futex_wake(QemuEvent *ev, int n) |
c7c4d063 | 319 | { |
c096358e | 320 | assert(ev->initialized); |
158ef8cb | 321 | pthread_mutex_lock(&ev->lock); |
c7c4d063 PB |
322 | if (n == 1) { |
323 | pthread_cond_signal(&ev->cond); | |
324 | } else { | |
325 | pthread_cond_broadcast(&ev->cond); | |
326 | } | |
158ef8cb | 327 | pthread_mutex_unlock(&ev->lock); |
c7c4d063 PB |
328 | } |
329 | ||
fbcc3e50 | 330 | static inline void qemu_futex_wait(QemuEvent *ev, unsigned val) |
c7c4d063 | 331 | { |
c096358e | 332 | assert(ev->initialized); |
c7c4d063 PB |
333 | pthread_mutex_lock(&ev->lock); |
334 | if (ev->value == val) { | |
335 | pthread_cond_wait(&ev->cond, &ev->lock); | |
336 | } | |
337 | pthread_mutex_unlock(&ev->lock); | |
338 | } | |
339 | #endif | |
340 | ||
341 | /* Valid transitions: | |
342 | * - free->set, when setting the event | |
fbcc3e50 | 343 | * - busy->set, when setting the event, followed by qemu_futex_wake |
c7c4d063 PB |
344 | * - set->free, when resetting the event |
345 | * - free->busy, when waiting | |
346 | * | |
347 | * set->busy does not happen (it can be observed from the outside but | |
348 | * it really is set->free->busy). | |
349 | * | |
350 | * busy->free provably cannot happen; to enforce it, the set->free transition | |
351 | * is done with an OR, which becomes a no-op if the event has concurrently | |
352 | * transitioned to free or busy. | |
353 | */ | |
354 | ||
355 | #define EV_SET 0 | |
356 | #define EV_FREE 1 | |
357 | #define EV_BUSY -1 | |
358 | ||
359 | void qemu_event_init(QemuEvent *ev, bool init) | |
360 | { | |
361 | #ifndef __linux__ | |
362 | pthread_mutex_init(&ev->lock, NULL); | |
363 | pthread_cond_init(&ev->cond, NULL); | |
364 | #endif | |
365 | ||
366 | ev->value = (init ? EV_SET : EV_FREE); | |
c096358e | 367 | ev->initialized = true; |
c7c4d063 PB |
368 | } |
369 | ||
370 | void qemu_event_destroy(QemuEvent *ev) | |
371 | { | |
c096358e FZ |
372 | assert(ev->initialized); |
373 | ev->initialized = false; | |
c7c4d063 PB |
374 | #ifndef __linux__ |
375 | pthread_mutex_destroy(&ev->lock); | |
376 | pthread_cond_destroy(&ev->cond); | |
377 | #endif | |
378 | } | |
379 | ||
380 | void qemu_event_set(QemuEvent *ev) | |
381 | { | |
374293ca PB |
382 | /* qemu_event_set has release semantics, but because it *loads* |
383 | * ev->value we need a full memory barrier here. | |
384 | */ | |
c096358e | 385 | assert(ev->initialized); |
374293ca | 386 | smp_mb(); |
d73415a3 SH |
387 | if (qatomic_read(&ev->value) != EV_SET) { |
388 | if (qatomic_xchg(&ev->value, EV_SET) == EV_BUSY) { | |
c7c4d063 | 389 | /* There were waiters, wake them up. */ |
fbcc3e50 | 390 | qemu_futex_wake(ev, INT_MAX); |
c7c4d063 PB |
391 | } |
392 | } | |
393 | } | |
394 | ||
395 | void qemu_event_reset(QemuEvent *ev) | |
396 | { | |
374293ca PB |
397 | unsigned value; |
398 | ||
c096358e | 399 | assert(ev->initialized); |
d73415a3 | 400 | value = qatomic_read(&ev->value); |
374293ca PB |
401 | smp_mb_acquire(); |
402 | if (value == EV_SET) { | |
c7c4d063 PB |
403 | /* |
404 | * If there was a concurrent reset (or even reset+wait), | |
405 | * do nothing. Otherwise change EV_SET->EV_FREE. | |
406 | */ | |
d73415a3 | 407 | qatomic_or(&ev->value, EV_FREE); |
c7c4d063 PB |
408 | } |
409 | } | |
410 | ||
411 | void qemu_event_wait(QemuEvent *ev) | |
412 | { | |
413 | unsigned value; | |
414 | ||
c096358e | 415 | assert(ev->initialized); |
d73415a3 | 416 | value = qatomic_read(&ev->value); |
374293ca | 417 | smp_mb_acquire(); |
c7c4d063 PB |
418 | if (value != EV_SET) { |
419 | if (value == EV_FREE) { | |
420 | /* | |
421 | * Leave the event reset and tell qemu_event_set that there | |
422 | * are waiters. No need to retry, because there cannot be | |
67cc32eb | 423 | * a concurrent busy->free transition. After the CAS, the |
c7c4d063 PB |
424 | * event will be either set or busy. |
425 | */ | |
d73415a3 | 426 | if (qatomic_cmpxchg(&ev->value, EV_FREE, EV_BUSY) == EV_SET) { |
c7c4d063 PB |
427 | return; |
428 | } | |
429 | } | |
fbcc3e50 | 430 | qemu_futex_wait(ev, EV_BUSY); |
c7c4d063 PB |
431 | } |
432 | } | |
433 | ||
a458774a | 434 | static __thread NotifierList thread_exit; |
ef57137f | 435 | |
a458774a PM |
436 | /* |
437 | * Note that in this implementation you can register a thread-exit | |
438 | * notifier for the main thread, but it will never be called. | |
439 | * This is OK because main thread exit can only happen when the | |
440 | * entire process is exiting, and the API allows notifiers to not | |
441 | * be called on process exit. | |
442 | */ | |
ef57137f PB |
443 | void qemu_thread_atexit_add(Notifier *notifier) |
444 | { | |
a458774a | 445 | notifier_list_add(&thread_exit, notifier); |
ef57137f PB |
446 | } |
447 | ||
448 | void qemu_thread_atexit_remove(Notifier *notifier) | |
449 | { | |
ef57137f | 450 | notifier_remove(notifier); |
ef57137f PB |
451 | } |
452 | ||
a458774a | 453 | static void qemu_thread_atexit_notify(void *arg) |
ef57137f | 454 | { |
a458774a PM |
455 | /* |
456 | * Called when non-main thread exits (via qemu_thread_exit() | |
457 | * or by returning from its start routine.) | |
458 | */ | |
459 | notifier_list_notify(&thread_exit, NULL); | |
ef57137f PB |
460 | } |
461 | ||
68a93982 | 462 | typedef struct { |
463 | void *(*start_routine)(void *); | |
464 | void *arg; | |
465 | char *name; | |
466 | } QemuThreadArgs; | |
467 | ||
468 | static void *qemu_thread_start(void *args) | |
469 | { | |
470 | QemuThreadArgs *qemu_thread_args = args; | |
471 | void *(*start_routine)(void *) = qemu_thread_args->start_routine; | |
472 | void *arg = qemu_thread_args->arg; | |
a458774a | 473 | void *r; |
68a93982 | 474 | |
475 | /* Attempt to set the threads name; note that this is for debug, so | |
476 | * we're not going to fail if we can't set it. | |
477 | */ | |
d820fa5b | 478 | if (name_threads && qemu_thread_args->name) { |
479a5747 | 479 | # if defined(CONFIG_PTHREAD_SETNAME_NP_W_TID) |
d820fa5b | 480 | pthread_setname_np(pthread_self(), qemu_thread_args->name); |
479a5747 RB |
481 | # elif defined(CONFIG_PTHREAD_SETNAME_NP_WO_TID) |
482 | pthread_setname_np(qemu_thread_args->name); | |
483 | # endif | |
d820fa5b | 484 | } |
ce9f0e5b | 485 | QEMU_TSAN_ANNOTATE_THREAD_NAME(qemu_thread_args->name); |
68a93982 | 486 | g_free(qemu_thread_args->name); |
487 | g_free(qemu_thread_args); | |
37daf1ba RH |
488 | |
489 | /* | |
490 | * GCC 11 with glibc 2.17 on PowerPC reports | |
491 | * | |
492 | * qemu-thread-posix.c:540:5: error: ‘__sigsetjmp’ accessing 656 bytes | |
493 | * in a region of size 528 [-Werror=stringop-overflow=] | |
494 | * 540 | pthread_cleanup_push(qemu_thread_atexit_notify, NULL); | |
495 | * | ^~~~~~~~~~~~~~~~~~~~ | |
496 | * | |
497 | * which is clearly nonsense. | |
498 | */ | |
499 | #pragma GCC diagnostic push | |
500 | #ifndef __clang__ | |
501 | #pragma GCC diagnostic ignored "-Wstringop-overflow" | |
502 | #endif | |
503 | ||
a458774a PM |
504 | pthread_cleanup_push(qemu_thread_atexit_notify, NULL); |
505 | r = start_routine(arg); | |
506 | pthread_cleanup_pop(1); | |
37daf1ba RH |
507 | |
508 | #pragma GCC diagnostic pop | |
509 | ||
a458774a | 510 | return r; |
5c312079 DDAG |
511 | } |
512 | ||
4900116e | 513 | void qemu_thread_create(QemuThread *thread, const char *name, |
e5d355d1 | 514 | void *(*start_routine)(void*), |
cf218714 | 515 | void *arg, int mode) |
e5d355d1 | 516 | { |
cf218714 | 517 | sigset_t set, oldset; |
e5d355d1 | 518 | int err; |
8763046b | 519 | pthread_attr_t attr; |
d820fa5b | 520 | QemuThreadArgs *qemu_thread_args; |
e5d355d1 | 521 | |
8763046b JK |
522 | err = pthread_attr_init(&attr); |
523 | if (err) { | |
524 | error_exit(err, __func__); | |
525 | } | |
55541c8a | 526 | |
68a93982 | 527 | if (mode == QEMU_THREAD_DETACHED) { |
528 | pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
529 | } | |
530 | ||
cf218714 | 531 | /* Leave signal handling to the iothread. */ |
55541c8a | 532 | sigfillset(&set); |
21a43af0 RB |
533 | /* Blocking the signals can result in undefined behaviour. */ |
534 | sigdelset(&set, SIGSEGV); | |
535 | sigdelset(&set, SIGFPE); | |
536 | sigdelset(&set, SIGILL); | |
537 | /* TODO avoid SIGBUS loss on macOS */ | |
55541c8a | 538 | pthread_sigmask(SIG_SETMASK, &set, &oldset); |
55541c8a | 539 | |
d820fa5b PX |
540 | qemu_thread_args = g_new0(QemuThreadArgs, 1); |
541 | qemu_thread_args->name = g_strdup(name); | |
542 | qemu_thread_args->start_routine = start_routine; | |
543 | qemu_thread_args->arg = arg; | |
544 | ||
545 | err = pthread_create(&thread->thread, &attr, | |
546 | qemu_thread_start, qemu_thread_args); | |
4900116e | 547 | |
68a93982 | 548 | if (err) |
549 | error_exit(err, __func__); | |
550 | ||
55541c8a | 551 | pthread_sigmask(SIG_SETMASK, &oldset, NULL); |
8763046b JK |
552 | |
553 | pthread_attr_destroy(&attr); | |
e5d355d1 AL |
554 | } |
555 | ||
7730f32c DH |
556 | int qemu_thread_set_affinity(QemuThread *thread, unsigned long *host_cpus, |
557 | unsigned long nbits) | |
558 | { | |
559 | #if defined(CONFIG_PTHREAD_AFFINITY_NP) | |
560 | const size_t setsize = CPU_ALLOC_SIZE(nbits); | |
561 | unsigned long value; | |
562 | cpu_set_t *cpuset; | |
563 | int err; | |
564 | ||
565 | cpuset = CPU_ALLOC(nbits); | |
566 | g_assert(cpuset); | |
567 | ||
568 | CPU_ZERO_S(setsize, cpuset); | |
569 | value = find_first_bit(host_cpus, nbits); | |
570 | while (value < nbits) { | |
571 | CPU_SET_S(value, setsize, cpuset); | |
572 | value = find_next_bit(host_cpus, nbits, value + 1); | |
573 | } | |
574 | ||
575 | err = pthread_setaffinity_np(thread->thread, setsize, cpuset); | |
576 | CPU_FREE(cpuset); | |
577 | return err; | |
578 | #else | |
579 | return -ENOSYS; | |
580 | #endif | |
581 | } | |
582 | ||
583 | int qemu_thread_get_affinity(QemuThread *thread, unsigned long **host_cpus, | |
584 | unsigned long *nbits) | |
585 | { | |
586 | #if defined(CONFIG_PTHREAD_AFFINITY_NP) | |
587 | unsigned long tmpbits; | |
588 | cpu_set_t *cpuset; | |
589 | size_t setsize; | |
590 | int i, err; | |
591 | ||
592 | tmpbits = CPU_SETSIZE; | |
593 | while (true) { | |
594 | setsize = CPU_ALLOC_SIZE(tmpbits); | |
595 | cpuset = CPU_ALLOC(tmpbits); | |
596 | g_assert(cpuset); | |
597 | ||
598 | err = pthread_getaffinity_np(thread->thread, setsize, cpuset); | |
599 | if (err) { | |
600 | CPU_FREE(cpuset); | |
601 | if (err != -EINVAL) { | |
602 | return err; | |
603 | } | |
604 | tmpbits *= 2; | |
605 | } else { | |
606 | break; | |
607 | } | |
608 | } | |
609 | ||
610 | /* Convert the result into a proper bitmap. */ | |
611 | *nbits = tmpbits; | |
612 | *host_cpus = bitmap_new(tmpbits); | |
613 | for (i = 0; i < tmpbits; i++) { | |
614 | if (CPU_ISSET(i, cpuset)) { | |
615 | set_bit(i, *host_cpus); | |
616 | } | |
617 | } | |
618 | CPU_FREE(cpuset); | |
619 | return 0; | |
620 | #else | |
621 | return -ENOSYS; | |
622 | #endif | |
623 | } | |
624 | ||
b7680cb6 | 625 | void qemu_thread_get_self(QemuThread *thread) |
e5d355d1 AL |
626 | { |
627 | thread->thread = pthread_self(); | |
628 | } | |
629 | ||
2d797b65 | 630 | bool qemu_thread_is_self(QemuThread *thread) |
e5d355d1 | 631 | { |
b7680cb6 | 632 | return pthread_equal(pthread_self(), thread->thread); |
e5d355d1 AL |
633 | } |
634 | ||
313b1d69 CC |
635 | void qemu_thread_exit(void *retval) |
636 | { | |
637 | pthread_exit(retval); | |
638 | } | |
8763046b JK |
639 | |
640 | void *qemu_thread_join(QemuThread *thread) | |
641 | { | |
642 | int err; | |
643 | void *ret; | |
644 | ||
645 | err = pthread_join(thread->thread, &ret); | |
646 | if (err) { | |
647 | error_exit(err, __func__); | |
648 | } | |
649 | return ret; | |
650 | } |