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Commit | Line | Data |
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d3b12f5d PB |
1 | /* |
2 | * QEMU System Emulator | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
d3b12f5d | 24 | |
d38ea87a | 25 | #include "qemu/osdep.h" |
da34e65c | 26 | #include "qapi/error.h" |
f348b6d1 | 27 | #include "qemu/cutils.h" |
1de7afc9 | 28 | #include "qemu/timer.h" |
740b1759 | 29 | #include "sysemu/cpu-timers.h" |
d759c951 | 30 | #include "sysemu/replay.h" |
1de7afc9 | 31 | #include "qemu/main-loop.h" |
737e150e | 32 | #include "block/aio.h" |
8297be80 | 33 | #include "qemu/error-report.h" |
e9ed92bd | 34 | #include "qemu/queue.h" |
c905a368 | 35 | #include "qemu/compiler.h" |
e9ed92bd PB |
36 | |
37 | #ifndef _WIN32 | |
38 | #include <sys/wait.h> | |
39 | #endif | |
d3b12f5d PB |
40 | |
41 | #ifndef _WIN32 | |
42 | ||
d3b12f5d PB |
43 | /* If we have signalfd, we mask out the signals we want to handle and then |
44 | * use signalfd to listen for them. We rely on whatever the current signal | |
45 | * handler is to dispatch the signals when we receive them. | |
46 | */ | |
c905a368 DB |
47 | /* |
48 | * Disable CFI checks. | |
49 | * We are going to call a signal hander directly. Such handler may or may not | |
50 | * have been defined in our binary, so there's no guarantee that the pointer | |
51 | * used to set the handler is a cfi-valid pointer. Since the handlers are | |
52 | * stored in kernel memory, changing the handler to an attacker-defined | |
53 | * function requires being able to call a sigaction() syscall, | |
54 | * which is not as easy as overwriting a pointer in memory. | |
55 | */ | |
56 | QEMU_DISABLE_CFI | |
d3b12f5d PB |
57 | static void sigfd_handler(void *opaque) |
58 | { | |
59 | int fd = (intptr_t)opaque; | |
60 | struct qemu_signalfd_siginfo info; | |
61 | struct sigaction action; | |
62 | ssize_t len; | |
63 | ||
64 | while (1) { | |
65 | do { | |
66 | len = read(fd, &info, sizeof(info)); | |
67 | } while (len == -1 && errno == EINTR); | |
68 | ||
69 | if (len == -1 && errno == EAGAIN) { | |
70 | break; | |
71 | } | |
72 | ||
73 | if (len != sizeof(info)) { | |
372a87a1 TH |
74 | error_report("read from sigfd returned %zd: %s", len, |
75 | g_strerror(errno)); | |
d3b12f5d PB |
76 | return; |
77 | } | |
78 | ||
79 | sigaction(info.ssi_signo, NULL, &action); | |
80 | if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) { | |
d98d4072 | 81 | sigaction_invoke(&action, &info); |
d3b12f5d PB |
82 | } else if (action.sa_handler) { |
83 | action.sa_handler(info.ssi_signo); | |
84 | } | |
85 | } | |
86 | } | |
87 | ||
78524330 | 88 | static int qemu_signal_init(Error **errp) |
d3b12f5d PB |
89 | { |
90 | int sigfd; | |
91 | sigset_t set; | |
92 | ||
93 | /* | |
94 | * SIG_IPI must be blocked in the main thread and must not be caught | |
95 | * by sigwait() in the signal thread. Otherwise, the cpu thread will | |
96 | * not catch it reliably. | |
97 | */ | |
98 | sigemptyset(&set); | |
99 | sigaddset(&set, SIG_IPI); | |
d3b12f5d PB |
100 | sigaddset(&set, SIGIO); |
101 | sigaddset(&set, SIGALRM); | |
102 | sigaddset(&set, SIGBUS); | |
3e9418e1 JK |
103 | /* SIGINT cannot be handled via signalfd, so that ^C can be used |
104 | * to interrupt QEMU when it is being run under gdb. SIGHUP and | |
105 | * SIGTERM are also handled asynchronously, even though it is not | |
106 | * strictly necessary, because they use the same handler as SIGINT. | |
107 | */ | |
d3b12f5d PB |
108 | pthread_sigmask(SIG_BLOCK, &set, NULL); |
109 | ||
4aa7534d | 110 | sigdelset(&set, SIG_IPI); |
d3b12f5d PB |
111 | sigfd = qemu_signalfd(&set); |
112 | if (sigfd == -1) { | |
78524330 | 113 | error_setg_errno(errp, errno, "failed to create signalfd"); |
d3b12f5d PB |
114 | return -errno; |
115 | } | |
116 | ||
117 | fcntl_setfl(sigfd, O_NONBLOCK); | |
118 | ||
82e1cc4b | 119 | qemu_set_fd_handler(sigfd, sigfd_handler, NULL, (void *)(intptr_t)sigfd); |
d3b12f5d PB |
120 | |
121 | return 0; | |
122 | } | |
123 | ||
124 | #else /* _WIN32 */ | |
125 | ||
78524330 | 126 | static int qemu_signal_init(Error **errp) |
d3b12f5d | 127 | { |
d3b12f5d PB |
128 | return 0; |
129 | } | |
4c8d0d27 PB |
130 | #endif |
131 | ||
132 | static AioContext *qemu_aio_context; | |
edec47cf PB |
133 | static QEMUBH *qemu_notify_bh; |
134 | ||
135 | static void notify_event_cb(void *opaque) | |
136 | { | |
137 | /* No need to do anything; this bottom half is only used to | |
138 | * kick the kernel out of ppoll/poll/WaitForMultipleObjects. | |
139 | */ | |
140 | } | |
d3b12f5d | 141 | |
5f3aa1ff SH |
142 | AioContext *qemu_get_aio_context(void) |
143 | { | |
144 | return qemu_aio_context; | |
145 | } | |
146 | ||
d3b12f5d PB |
147 | void qemu_notify_event(void) |
148 | { | |
4c8d0d27 | 149 | if (!qemu_aio_context) { |
ee77dfb2 MR |
150 | return; |
151 | } | |
edec47cf | 152 | qemu_bh_schedule(qemu_notify_bh); |
d3b12f5d PB |
153 | } |
154 | ||
cbff4b34 SH |
155 | static GArray *gpollfds; |
156 | ||
2f78e491 | 157 | int qemu_init_main_loop(Error **errp) |
d3b12f5d PB |
158 | { |
159 | int ret; | |
82cbbdc6 | 160 | GSource *src; |
d3b12f5d | 161 | |
3f53bc61 | 162 | init_clocks(qemu_timer_notify_cb); |
172061a0 | 163 | |
78524330 | 164 | ret = qemu_signal_init(errp); |
d3b12f5d PB |
165 | if (ret) { |
166 | return ret; | |
167 | } | |
168 | ||
668f62ec | 169 | qemu_aio_context = aio_context_new(errp); |
2f78e491 | 170 | if (!qemu_aio_context) { |
2f78e491 CN |
171 | return -EMFILE; |
172 | } | |
28ba61e7 | 173 | qemu_notify_bh = qemu_bh_new(notify_event_cb, NULL); |
cbff4b34 | 174 | gpollfds = g_array_new(FALSE, FALSE, sizeof(GPollFD)); |
82cbbdc6 | 175 | src = aio_get_g_source(qemu_aio_context); |
c3ff757d | 176 | g_source_set_name(src, "aio-context"); |
82cbbdc6 PB |
177 | g_source_attach(src, NULL); |
178 | g_source_unref(src); | |
f3926945 | 179 | src = iohandler_get_g_source(); |
c3ff757d | 180 | g_source_set_name(src, "io-handler"); |
f3926945 FZ |
181 | g_source_attach(src, NULL); |
182 | g_source_unref(src); | |
d3b12f5d PB |
183 | return 0; |
184 | } | |
185 | ||
d3b12f5d PB |
186 | static int max_priority; |
187 | ||
ea26ce76 | 188 | #ifndef _WIN32 |
48ce11ff SH |
189 | static int glib_pollfds_idx; |
190 | static int glib_n_poll_fds; | |
191 | ||
8c278762 TH |
192 | void qemu_fd_register(int fd) |
193 | { | |
194 | } | |
195 | ||
7b595f35 | 196 | static void glib_pollfds_fill(int64_t *cur_timeout) |
d3b12f5d PB |
197 | { |
198 | GMainContext *context = g_main_context_default(); | |
4dae83ae | 199 | int timeout = 0; |
7b595f35 | 200 | int64_t timeout_ns; |
48ce11ff | 201 | int n; |
d3b12f5d PB |
202 | |
203 | g_main_context_prepare(context, &max_priority); | |
204 | ||
48ce11ff SH |
205 | glib_pollfds_idx = gpollfds->len; |
206 | n = glib_n_poll_fds; | |
207 | do { | |
208 | GPollFD *pfds; | |
209 | glib_n_poll_fds = n; | |
210 | g_array_set_size(gpollfds, glib_pollfds_idx + glib_n_poll_fds); | |
211 | pfds = &g_array_index(gpollfds, GPollFD, glib_pollfds_idx); | |
212 | n = g_main_context_query(context, max_priority, &timeout, pfds, | |
213 | glib_n_poll_fds); | |
214 | } while (n != glib_n_poll_fds); | |
d3b12f5d | 215 | |
7b595f35 AB |
216 | if (timeout < 0) { |
217 | timeout_ns = -1; | |
218 | } else { | |
219 | timeout_ns = (int64_t)timeout * (int64_t)SCALE_MS; | |
d3b12f5d | 220 | } |
7b595f35 AB |
221 | |
222 | *cur_timeout = qemu_soonest_timeout(timeout_ns, *cur_timeout); | |
d3b12f5d PB |
223 | } |
224 | ||
48ce11ff | 225 | static void glib_pollfds_poll(void) |
d3b12f5d PB |
226 | { |
227 | GMainContext *context = g_main_context_default(); | |
48ce11ff | 228 | GPollFD *pfds = &g_array_index(gpollfds, GPollFD, glib_pollfds_idx); |
d3b12f5d | 229 | |
48ce11ff | 230 | if (g_main_context_check(context, max_priority, pfds, glib_n_poll_fds)) { |
d3b12f5d PB |
231 | g_main_context_dispatch(context); |
232 | } | |
233 | } | |
234 | ||
893986fe AL |
235 | #define MAX_MAIN_LOOP_SPIN (1000) |
236 | ||
7b595f35 | 237 | static int os_host_main_loop_wait(int64_t timeout) |
15455536 | 238 | { |
ecbddbb1 | 239 | GMainContext *context = g_main_context_default(); |
15455536 PB |
240 | int ret; |
241 | ||
ecbddbb1 RJ |
242 | g_main_context_acquire(context); |
243 | ||
48ce11ff | 244 | glib_pollfds_fill(&timeout); |
15455536 | 245 | |
d759c951 AB |
246 | qemu_mutex_unlock_iothread(); |
247 | replay_mutex_unlock(); | |
15455536 | 248 | |
7b595f35 | 249 | ret = qemu_poll_ns((GPollFD *)gpollfds->data, gpollfds->len, timeout); |
cbff4b34 | 250 | |
d759c951 AB |
251 | replay_mutex_lock(); |
252 | qemu_mutex_lock_iothread(); | |
15455536 | 253 | |
48ce11ff | 254 | glib_pollfds_poll(); |
ecbddbb1 RJ |
255 | |
256 | g_main_context_release(context); | |
257 | ||
15455536 PB |
258 | return ret; |
259 | } | |
260 | #else | |
d3b12f5d PB |
261 | /***********************************************************/ |
262 | /* Polling handling */ | |
263 | ||
264 | typedef struct PollingEntry { | |
265 | PollingFunc *func; | |
266 | void *opaque; | |
267 | struct PollingEntry *next; | |
268 | } PollingEntry; | |
269 | ||
270 | static PollingEntry *first_polling_entry; | |
271 | ||
272 | int qemu_add_polling_cb(PollingFunc *func, void *opaque) | |
273 | { | |
274 | PollingEntry **ppe, *pe; | |
275 | pe = g_malloc0(sizeof(PollingEntry)); | |
276 | pe->func = func; | |
277 | pe->opaque = opaque; | |
278 | for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next); | |
279 | *ppe = pe; | |
280 | return 0; | |
281 | } | |
282 | ||
283 | void qemu_del_polling_cb(PollingFunc *func, void *opaque) | |
284 | { | |
285 | PollingEntry **ppe, *pe; | |
286 | for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next) { | |
287 | pe = *ppe; | |
288 | if (pe->func == func && pe->opaque == opaque) { | |
289 | *ppe = pe->next; | |
290 | g_free(pe); | |
291 | break; | |
292 | } | |
293 | } | |
294 | } | |
295 | ||
296 | /***********************************************************/ | |
297 | /* Wait objects support */ | |
298 | typedef struct WaitObjects { | |
299 | int num; | |
06ac7d49 | 300 | int revents[MAXIMUM_WAIT_OBJECTS + 1]; |
d3b12f5d PB |
301 | HANDLE events[MAXIMUM_WAIT_OBJECTS + 1]; |
302 | WaitObjectFunc *func[MAXIMUM_WAIT_OBJECTS + 1]; | |
303 | void *opaque[MAXIMUM_WAIT_OBJECTS + 1]; | |
304 | } WaitObjects; | |
305 | ||
306 | static WaitObjects wait_objects = {0}; | |
307 | ||
308 | int qemu_add_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque) | |
309 | { | |
310 | WaitObjects *w = &wait_objects; | |
311 | if (w->num >= MAXIMUM_WAIT_OBJECTS) { | |
312 | return -1; | |
313 | } | |
314 | w->events[w->num] = handle; | |
315 | w->func[w->num] = func; | |
316 | w->opaque[w->num] = opaque; | |
06ac7d49 | 317 | w->revents[w->num] = 0; |
d3b12f5d PB |
318 | w->num++; |
319 | return 0; | |
320 | } | |
321 | ||
322 | void qemu_del_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque) | |
323 | { | |
324 | int i, found; | |
325 | WaitObjects *w = &wait_objects; | |
326 | ||
327 | found = 0; | |
328 | for (i = 0; i < w->num; i++) { | |
329 | if (w->events[i] == handle) { | |
330 | found = 1; | |
331 | } | |
332 | if (found) { | |
333 | w->events[i] = w->events[i + 1]; | |
334 | w->func[i] = w->func[i + 1]; | |
335 | w->opaque[i] = w->opaque[i + 1]; | |
06ac7d49 | 336 | w->revents[i] = w->revents[i + 1]; |
d3b12f5d PB |
337 | } |
338 | } | |
339 | if (found) { | |
340 | w->num--; | |
341 | } | |
342 | } | |
343 | ||
d3385eb4 PB |
344 | void qemu_fd_register(int fd) |
345 | { | |
4c8d0d27 PB |
346 | WSAEventSelect(fd, event_notifier_get_handle(&qemu_aio_context->notifier), |
347 | FD_READ | FD_ACCEPT | FD_CLOSE | | |
d3385eb4 PB |
348 | FD_CONNECT | FD_WRITE | FD_OOB); |
349 | } | |
350 | ||
cbff4b34 SH |
351 | static int pollfds_fill(GArray *pollfds, fd_set *rfds, fd_set *wfds, |
352 | fd_set *xfds) | |
353 | { | |
354 | int nfds = -1; | |
355 | int i; | |
356 | ||
357 | for (i = 0; i < pollfds->len; i++) { | |
358 | GPollFD *pfd = &g_array_index(pollfds, GPollFD, i); | |
359 | int fd = pfd->fd; | |
360 | int events = pfd->events; | |
8db165b3 | 361 | if (events & G_IO_IN) { |
cbff4b34 SH |
362 | FD_SET(fd, rfds); |
363 | nfds = MAX(nfds, fd); | |
364 | } | |
8db165b3 | 365 | if (events & G_IO_OUT) { |
cbff4b34 SH |
366 | FD_SET(fd, wfds); |
367 | nfds = MAX(nfds, fd); | |
368 | } | |
369 | if (events & G_IO_PRI) { | |
370 | FD_SET(fd, xfds); | |
371 | nfds = MAX(nfds, fd); | |
372 | } | |
373 | } | |
374 | return nfds; | |
375 | } | |
376 | ||
377 | static void pollfds_poll(GArray *pollfds, int nfds, fd_set *rfds, | |
378 | fd_set *wfds, fd_set *xfds) | |
379 | { | |
380 | int i; | |
381 | ||
382 | for (i = 0; i < pollfds->len; i++) { | |
383 | GPollFD *pfd = &g_array_index(pollfds, GPollFD, i); | |
384 | int fd = pfd->fd; | |
385 | int revents = 0; | |
386 | ||
387 | if (FD_ISSET(fd, rfds)) { | |
8db165b3 | 388 | revents |= G_IO_IN; |
cbff4b34 SH |
389 | } |
390 | if (FD_ISSET(fd, wfds)) { | |
8db165b3 | 391 | revents |= G_IO_OUT; |
cbff4b34 SH |
392 | } |
393 | if (FD_ISSET(fd, xfds)) { | |
394 | revents |= G_IO_PRI; | |
395 | } | |
396 | pfd->revents = revents & pfd->events; | |
397 | } | |
398 | } | |
399 | ||
7b595f35 | 400 | static int os_host_main_loop_wait(int64_t timeout) |
d3b12f5d | 401 | { |
ea26ce76 | 402 | GMainContext *context = g_main_context_default(); |
48ce11ff | 403 | GPollFD poll_fds[1024 * 2]; /* this is probably overkill */ |
134a03e0 | 404 | int select_ret = 0; |
48ce11ff | 405 | int g_poll_ret, ret, i, n_poll_fds; |
d3b12f5d | 406 | PollingEntry *pe; |
d3385eb4 | 407 | WaitObjects *w = &wait_objects; |
42fe1c24 | 408 | gint poll_timeout; |
7b595f35 | 409 | int64_t poll_timeout_ns; |
15455536 | 410 | static struct timeval tv0; |
9cbaacf9 SH |
411 | fd_set rfds, wfds, xfds; |
412 | int nfds; | |
d3b12f5d | 413 | |
ecbddbb1 RJ |
414 | g_main_context_acquire(context); |
415 | ||
d3b12f5d PB |
416 | /* XXX: need to suppress polling by better using win32 events */ |
417 | ret = 0; | |
418 | for (pe = first_polling_entry; pe != NULL; pe = pe->next) { | |
419 | ret |= pe->func(pe->opaque); | |
420 | } | |
d3385eb4 | 421 | if (ret != 0) { |
ecbddbb1 | 422 | g_main_context_release(context); |
d3385eb4 PB |
423 | return ret; |
424 | } | |
d3b12f5d | 425 | |
3cb8c205 SH |
426 | FD_ZERO(&rfds); |
427 | FD_ZERO(&wfds); | |
428 | FD_ZERO(&xfds); | |
429 | nfds = pollfds_fill(gpollfds, &rfds, &wfds, &xfds); | |
430 | if (nfds >= 0) { | |
431 | select_ret = select(nfds + 1, &rfds, &wfds, &xfds, &tv0); | |
432 | if (select_ret != 0) { | |
433 | timeout = 0; | |
434 | } | |
435 | if (select_ret > 0) { | |
436 | pollfds_poll(gpollfds, nfds, &rfds, &wfds, &xfds); | |
437 | } | |
438 | } | |
439 | ||
ea26ce76 | 440 | g_main_context_prepare(context, &max_priority); |
42fe1c24 | 441 | n_poll_fds = g_main_context_query(context, max_priority, &poll_timeout, |
ea26ce76 | 442 | poll_fds, ARRAY_SIZE(poll_fds)); |
6512e34b | 443 | g_assert(n_poll_fds + w->num <= ARRAY_SIZE(poll_fds)); |
ea26ce76 | 444 | |
06ac7d49 | 445 | for (i = 0; i < w->num; i++) { |
58b9630d | 446 | poll_fds[n_poll_fds + i].fd = (DWORD_PTR)w->events[i]; |
ea26ce76 | 447 | poll_fds[n_poll_fds + i].events = G_IO_IN; |
06ac7d49 PB |
448 | } |
449 | ||
7b595f35 AB |
450 | if (poll_timeout < 0) { |
451 | poll_timeout_ns = -1; | |
452 | } else { | |
453 | poll_timeout_ns = (int64_t)poll_timeout * (int64_t)SCALE_MS; | |
3239ad04 SW |
454 | } |
455 | ||
7b595f35 AB |
456 | poll_timeout_ns = qemu_soonest_timeout(poll_timeout_ns, timeout); |
457 | ||
d3385eb4 | 458 | qemu_mutex_unlock_iothread(); |
d759c951 AB |
459 | |
460 | replay_mutex_unlock(); | |
461 | ||
7b595f35 AB |
462 | g_poll_ret = qemu_poll_ns(poll_fds, n_poll_fds + w->num, poll_timeout_ns); |
463 | ||
d759c951 AB |
464 | replay_mutex_lock(); |
465 | ||
d3385eb4 | 466 | qemu_mutex_lock_iothread(); |
5e3bc735 | 467 | if (g_poll_ret > 0) { |
06ac7d49 | 468 | for (i = 0; i < w->num; i++) { |
ea26ce76 | 469 | w->revents[i] = poll_fds[n_poll_fds + i].revents; |
d3385eb4 | 470 | } |
06ac7d49 PB |
471 | for (i = 0; i < w->num; i++) { |
472 | if (w->revents[i] && w->func[i]) { | |
473 | w->func[i](w->opaque[i]); | |
d3b12f5d | 474 | } |
d3b12f5d PB |
475 | } |
476 | } | |
477 | ||
ea26ce76 PB |
478 | if (g_main_context_check(context, max_priority, poll_fds, n_poll_fds)) { |
479 | g_main_context_dispatch(context); | |
480 | } | |
481 | ||
ecbddbb1 RJ |
482 | g_main_context_release(context); |
483 | ||
5e3bc735 | 484 | return select_ret || g_poll_ret; |
d3b12f5d PB |
485 | } |
486 | #endif | |
487 | ||
1ab67b98 MAL |
488 | static NotifierList main_loop_poll_notifiers = |
489 | NOTIFIER_LIST_INITIALIZER(main_loop_poll_notifiers); | |
490 | ||
491 | void main_loop_poll_add_notifier(Notifier *notify) | |
492 | { | |
493 | notifier_list_add(&main_loop_poll_notifiers, notify); | |
494 | } | |
495 | ||
496 | void main_loop_poll_remove_notifier(Notifier *notify) | |
497 | { | |
498 | notifier_remove(notify); | |
499 | } | |
500 | ||
de5f852f | 501 | void main_loop_wait(int nonblocking) |
d3b12f5d | 502 | { |
1ab67b98 MAL |
503 | MainLoopPoll mlpoll = { |
504 | .state = MAIN_LOOP_POLL_FILL, | |
505 | .timeout = UINT32_MAX, | |
506 | .pollfds = gpollfds, | |
507 | }; | |
7c7db755 | 508 | int ret; |
7b595f35 | 509 | int64_t timeout_ns; |
d3b12f5d PB |
510 | |
511 | if (nonblocking) { | |
1ab67b98 | 512 | mlpoll.timeout = 0; |
d3b12f5d PB |
513 | } |
514 | ||
d3b12f5d | 515 | /* poll any events */ |
cbff4b34 | 516 | g_array_set_size(gpollfds, 0); /* reset for new iteration */ |
d3b12f5d | 517 | /* XXX: separate device handlers from system ones */ |
1ab67b98 | 518 | notifier_list_notify(&main_loop_poll_notifiers, &mlpoll); |
7b595f35 | 519 | |
1ab67b98 | 520 | if (mlpoll.timeout == UINT32_MAX) { |
7b595f35 AB |
521 | timeout_ns = -1; |
522 | } else { | |
1ab67b98 | 523 | timeout_ns = (uint64_t)mlpoll.timeout * (int64_t)(SCALE_MS); |
7b595f35 AB |
524 | } |
525 | ||
526 | timeout_ns = qemu_soonest_timeout(timeout_ns, | |
527 | timerlistgroup_deadline_ns( | |
528 | &main_loop_tlg)); | |
529 | ||
530 | ret = os_host_main_loop_wait(timeout_ns); | |
1ab67b98 MAL |
531 | mlpoll.state = ret < 0 ? MAIN_LOOP_POLL_ERR : MAIN_LOOP_POLL_OK; |
532 | notifier_list_notify(&main_loop_poll_notifiers, &mlpoll); | |
d3b12f5d | 533 | |
740b1759 CF |
534 | if (icount_enabled()) { |
535 | /* | |
536 | * CPU thread can infinitely wait for event after | |
537 | * missing the warp | |
538 | */ | |
8191d368 | 539 | icount_start_warp_timer(); |
740b1759 | 540 | } |
40daca54 | 541 | qemu_clock_run_all_timers(); |
d3b12f5d | 542 | } |
f627aab1 PB |
543 | |
544 | /* Functions to operate on the main QEMU AioContext. */ | |
545 | ||
546 | QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque) | |
547 | { | |
548 | return aio_bh_new(qemu_aio_context, cb, opaque); | |
549 | } | |
e9ed92bd PB |
550 | |
551 | /* | |
552 | * Functions to operate on the I/O handler AioContext. | |
553 | * This context runs on top of main loop. We can't reuse qemu_aio_context | |
554 | * because iohandlers mustn't be polled by aio_poll(qemu_aio_context). | |
555 | */ | |
556 | static AioContext *iohandler_ctx; | |
557 | ||
558 | static void iohandler_init(void) | |
559 | { | |
560 | if (!iohandler_ctx) { | |
561 | iohandler_ctx = aio_context_new(&error_abort); | |
562 | } | |
563 | } | |
564 | ||
565 | AioContext *iohandler_get_aio_context(void) | |
566 | { | |
567 | iohandler_init(); | |
568 | return iohandler_ctx; | |
569 | } | |
570 | ||
571 | GSource *iohandler_get_g_source(void) | |
572 | { | |
573 | iohandler_init(); | |
574 | return aio_get_g_source(iohandler_ctx); | |
575 | } | |
576 | ||
577 | void qemu_set_fd_handler(int fd, | |
578 | IOHandler *fd_read, | |
579 | IOHandler *fd_write, | |
580 | void *opaque) | |
581 | { | |
582 | iohandler_init(); | |
583 | aio_set_fd_handler(iohandler_ctx, fd, false, | |
584 | fd_read, fd_write, NULL, opaque); | |
585 | } | |
586 | ||
587 | void event_notifier_set_handler(EventNotifier *e, | |
588 | EventNotifierHandler *handler) | |
589 | { | |
590 | iohandler_init(); | |
591 | aio_set_event_notifier(iohandler_ctx, e, false, | |
592 | handler, NULL); | |
593 | } |