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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 | |
0ec024f6 | 25 | #include "qemu-common.h" |
1de7afc9 | 26 | #include "qemu/timer.h" |
0ec024f6 | 27 | #include "slirp/slirp.h" |
1de7afc9 | 28 | #include "qemu/main-loop.h" |
737e150e | 29 | #include "block/aio.h" |
d3b12f5d PB |
30 | |
31 | #ifndef _WIN32 | |
32 | ||
1de7afc9 | 33 | #include "qemu/compatfd.h" |
0ec024f6 | 34 | |
d3b12f5d PB |
35 | /* If we have signalfd, we mask out the signals we want to handle and then |
36 | * use signalfd to listen for them. We rely on whatever the current signal | |
37 | * handler is to dispatch the signals when we receive them. | |
38 | */ | |
39 | static void sigfd_handler(void *opaque) | |
40 | { | |
41 | int fd = (intptr_t)opaque; | |
42 | struct qemu_signalfd_siginfo info; | |
43 | struct sigaction action; | |
44 | ssize_t len; | |
45 | ||
46 | while (1) { | |
47 | do { | |
48 | len = read(fd, &info, sizeof(info)); | |
49 | } while (len == -1 && errno == EINTR); | |
50 | ||
51 | if (len == -1 && errno == EAGAIN) { | |
52 | break; | |
53 | } | |
54 | ||
55 | if (len != sizeof(info)) { | |
56 | printf("read from sigfd returned %zd: %m\n", len); | |
57 | return; | |
58 | } | |
59 | ||
60 | sigaction(info.ssi_signo, NULL, &action); | |
61 | if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) { | |
62 | action.sa_sigaction(info.ssi_signo, | |
63 | (siginfo_t *)&info, NULL); | |
64 | } else if (action.sa_handler) { | |
65 | action.sa_handler(info.ssi_signo); | |
66 | } | |
67 | } | |
68 | } | |
69 | ||
70 | static int qemu_signal_init(void) | |
71 | { | |
72 | int sigfd; | |
73 | sigset_t set; | |
74 | ||
75 | /* | |
76 | * SIG_IPI must be blocked in the main thread and must not be caught | |
77 | * by sigwait() in the signal thread. Otherwise, the cpu thread will | |
78 | * not catch it reliably. | |
79 | */ | |
80 | sigemptyset(&set); | |
81 | sigaddset(&set, SIG_IPI); | |
d3b12f5d PB |
82 | sigaddset(&set, SIGIO); |
83 | sigaddset(&set, SIGALRM); | |
84 | sigaddset(&set, SIGBUS); | |
85 | pthread_sigmask(SIG_BLOCK, &set, NULL); | |
86 | ||
4aa7534d | 87 | sigdelset(&set, SIG_IPI); |
d3b12f5d PB |
88 | sigfd = qemu_signalfd(&set); |
89 | if (sigfd == -1) { | |
90 | fprintf(stderr, "failed to create signalfd\n"); | |
91 | return -errno; | |
92 | } | |
93 | ||
94 | fcntl_setfl(sigfd, O_NONBLOCK); | |
95 | ||
96 | qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL, | |
97 | (void *)(intptr_t)sigfd); | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | #else /* _WIN32 */ | |
103 | ||
4c8d0d27 | 104 | static int qemu_signal_init(void) |
d3b12f5d | 105 | { |
d3b12f5d PB |
106 | return 0; |
107 | } | |
4c8d0d27 PB |
108 | #endif |
109 | ||
110 | static AioContext *qemu_aio_context; | |
d3b12f5d PB |
111 | |
112 | void qemu_notify_event(void) | |
113 | { | |
4c8d0d27 | 114 | if (!qemu_aio_context) { |
ee77dfb2 MR |
115 | return; |
116 | } | |
4c8d0d27 | 117 | aio_notify(qemu_aio_context); |
d3b12f5d PB |
118 | } |
119 | ||
172061a0 | 120 | int qemu_init_main_loop(void) |
d3b12f5d PB |
121 | { |
122 | int ret; | |
82cbbdc6 | 123 | GSource *src; |
d3b12f5d | 124 | |
172061a0 | 125 | init_clocks(); |
f9ab4654 PB |
126 | if (init_timer_alarm() < 0) { |
127 | fprintf(stderr, "could not initialize alarm timer\n"); | |
128 | exit(1); | |
129 | } | |
172061a0 | 130 | |
d3b12f5d PB |
131 | ret = qemu_signal_init(); |
132 | if (ret) { | |
133 | return ret; | |
134 | } | |
135 | ||
f627aab1 | 136 | qemu_aio_context = aio_context_new(); |
82cbbdc6 PB |
137 | src = aio_get_g_source(qemu_aio_context); |
138 | g_source_attach(src, NULL); | |
139 | g_source_unref(src); | |
d3b12f5d PB |
140 | return 0; |
141 | } | |
142 | ||
15455536 PB |
143 | static fd_set rfds, wfds, xfds; |
144 | static int nfds; | |
06ac7d49 | 145 | static GPollFD poll_fds[1024 * 2]; /* this is probably overkill */ |
d3b12f5d PB |
146 | static int n_poll_fds; |
147 | static int max_priority; | |
148 | ||
ea26ce76 | 149 | #ifndef _WIN32 |
d3b12f5d | 150 | static void glib_select_fill(int *max_fd, fd_set *rfds, fd_set *wfds, |
7c7db755 | 151 | fd_set *xfds, uint32_t *cur_timeout) |
d3b12f5d PB |
152 | { |
153 | GMainContext *context = g_main_context_default(); | |
154 | int i; | |
4dae83ae | 155 | int timeout = 0; |
d3b12f5d PB |
156 | |
157 | g_main_context_prepare(context, &max_priority); | |
158 | ||
159 | n_poll_fds = g_main_context_query(context, max_priority, &timeout, | |
160 | poll_fds, ARRAY_SIZE(poll_fds)); | |
161 | g_assert(n_poll_fds <= ARRAY_SIZE(poll_fds)); | |
162 | ||
163 | for (i = 0; i < n_poll_fds; i++) { | |
164 | GPollFD *p = &poll_fds[i]; | |
165 | ||
166 | if ((p->events & G_IO_IN)) { | |
167 | FD_SET(p->fd, rfds); | |
168 | *max_fd = MAX(*max_fd, p->fd); | |
169 | } | |
170 | if ((p->events & G_IO_OUT)) { | |
171 | FD_SET(p->fd, wfds); | |
172 | *max_fd = MAX(*max_fd, p->fd); | |
173 | } | |
174 | if ((p->events & G_IO_ERR)) { | |
175 | FD_SET(p->fd, xfds); | |
176 | *max_fd = MAX(*max_fd, p->fd); | |
177 | } | |
178 | } | |
179 | ||
4dae83ae PB |
180 | if (timeout >= 0 && timeout < *cur_timeout) { |
181 | *cur_timeout = timeout; | |
d3b12f5d PB |
182 | } |
183 | } | |
184 | ||
185 | static void glib_select_poll(fd_set *rfds, fd_set *wfds, fd_set *xfds, | |
186 | bool err) | |
187 | { | |
188 | GMainContext *context = g_main_context_default(); | |
189 | ||
190 | if (!err) { | |
191 | int i; | |
192 | ||
193 | for (i = 0; i < n_poll_fds; i++) { | |
194 | GPollFD *p = &poll_fds[i]; | |
195 | ||
196 | if ((p->events & G_IO_IN) && FD_ISSET(p->fd, rfds)) { | |
197 | p->revents |= G_IO_IN; | |
198 | } | |
199 | if ((p->events & G_IO_OUT) && FD_ISSET(p->fd, wfds)) { | |
200 | p->revents |= G_IO_OUT; | |
201 | } | |
202 | if ((p->events & G_IO_ERR) && FD_ISSET(p->fd, xfds)) { | |
203 | p->revents |= G_IO_ERR; | |
204 | } | |
205 | } | |
206 | } | |
207 | ||
208 | if (g_main_context_check(context, max_priority, poll_fds, n_poll_fds)) { | |
209 | g_main_context_dispatch(context); | |
210 | } | |
211 | } | |
212 | ||
7c7db755 | 213 | static int os_host_main_loop_wait(uint32_t timeout) |
15455536 | 214 | { |
7c7db755 | 215 | struct timeval tv, *tvarg = NULL; |
15455536 PB |
216 | int ret; |
217 | ||
218 | glib_select_fill(&nfds, &rfds, &wfds, &xfds, &timeout); | |
219 | ||
7c7db755 SS |
220 | if (timeout < UINT32_MAX) { |
221 | tvarg = &tv; | |
222 | tv.tv_sec = timeout / 1000; | |
223 | tv.tv_usec = (timeout % 1000) * 1000; | |
224 | } | |
225 | ||
15455536 PB |
226 | if (timeout > 0) { |
227 | qemu_mutex_unlock_iothread(); | |
228 | } | |
229 | ||
7c7db755 | 230 | ret = select(nfds + 1, &rfds, &wfds, &xfds, tvarg); |
15455536 PB |
231 | |
232 | if (timeout > 0) { | |
233 | qemu_mutex_lock_iothread(); | |
234 | } | |
235 | ||
236 | glib_select_poll(&rfds, &wfds, &xfds, (ret < 0)); | |
237 | return ret; | |
238 | } | |
239 | #else | |
d3b12f5d PB |
240 | /***********************************************************/ |
241 | /* Polling handling */ | |
242 | ||
243 | typedef struct PollingEntry { | |
244 | PollingFunc *func; | |
245 | void *opaque; | |
246 | struct PollingEntry *next; | |
247 | } PollingEntry; | |
248 | ||
249 | static PollingEntry *first_polling_entry; | |
250 | ||
251 | int qemu_add_polling_cb(PollingFunc *func, void *opaque) | |
252 | { | |
253 | PollingEntry **ppe, *pe; | |
254 | pe = g_malloc0(sizeof(PollingEntry)); | |
255 | pe->func = func; | |
256 | pe->opaque = opaque; | |
257 | for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next); | |
258 | *ppe = pe; | |
259 | return 0; | |
260 | } | |
261 | ||
262 | void qemu_del_polling_cb(PollingFunc *func, void *opaque) | |
263 | { | |
264 | PollingEntry **ppe, *pe; | |
265 | for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next) { | |
266 | pe = *ppe; | |
267 | if (pe->func == func && pe->opaque == opaque) { | |
268 | *ppe = pe->next; | |
269 | g_free(pe); | |
270 | break; | |
271 | } | |
272 | } | |
273 | } | |
274 | ||
275 | /***********************************************************/ | |
276 | /* Wait objects support */ | |
277 | typedef struct WaitObjects { | |
278 | int num; | |
06ac7d49 | 279 | int revents[MAXIMUM_WAIT_OBJECTS + 1]; |
d3b12f5d PB |
280 | HANDLE events[MAXIMUM_WAIT_OBJECTS + 1]; |
281 | WaitObjectFunc *func[MAXIMUM_WAIT_OBJECTS + 1]; | |
282 | void *opaque[MAXIMUM_WAIT_OBJECTS + 1]; | |
283 | } WaitObjects; | |
284 | ||
285 | static WaitObjects wait_objects = {0}; | |
286 | ||
287 | int qemu_add_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque) | |
288 | { | |
289 | WaitObjects *w = &wait_objects; | |
290 | if (w->num >= MAXIMUM_WAIT_OBJECTS) { | |
291 | return -1; | |
292 | } | |
293 | w->events[w->num] = handle; | |
294 | w->func[w->num] = func; | |
295 | w->opaque[w->num] = opaque; | |
06ac7d49 | 296 | w->revents[w->num] = 0; |
d3b12f5d PB |
297 | w->num++; |
298 | return 0; | |
299 | } | |
300 | ||
301 | void qemu_del_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque) | |
302 | { | |
303 | int i, found; | |
304 | WaitObjects *w = &wait_objects; | |
305 | ||
306 | found = 0; | |
307 | for (i = 0; i < w->num; i++) { | |
308 | if (w->events[i] == handle) { | |
309 | found = 1; | |
310 | } | |
311 | if (found) { | |
312 | w->events[i] = w->events[i + 1]; | |
313 | w->func[i] = w->func[i + 1]; | |
314 | w->opaque[i] = w->opaque[i + 1]; | |
06ac7d49 | 315 | w->revents[i] = w->revents[i + 1]; |
d3b12f5d PB |
316 | } |
317 | } | |
318 | if (found) { | |
319 | w->num--; | |
320 | } | |
321 | } | |
322 | ||
d3385eb4 PB |
323 | void qemu_fd_register(int fd) |
324 | { | |
4c8d0d27 PB |
325 | WSAEventSelect(fd, event_notifier_get_handle(&qemu_aio_context->notifier), |
326 | FD_READ | FD_ACCEPT | FD_CLOSE | | |
d3385eb4 PB |
327 | FD_CONNECT | FD_WRITE | FD_OOB); |
328 | } | |
329 | ||
7c7db755 | 330 | static int os_host_main_loop_wait(uint32_t timeout) |
d3b12f5d | 331 | { |
ea26ce76 | 332 | GMainContext *context = g_main_context_default(); |
5e3bc735 | 333 | int select_ret, g_poll_ret, ret, i; |
d3b12f5d | 334 | PollingEntry *pe; |
d3385eb4 | 335 | WaitObjects *w = &wait_objects; |
42fe1c24 | 336 | gint poll_timeout; |
15455536 | 337 | static struct timeval tv0; |
d3b12f5d PB |
338 | |
339 | /* XXX: need to suppress polling by better using win32 events */ | |
340 | ret = 0; | |
341 | for (pe = first_polling_entry; pe != NULL; pe = pe->next) { | |
342 | ret |= pe->func(pe->opaque); | |
343 | } | |
d3385eb4 PB |
344 | if (ret != 0) { |
345 | return ret; | |
346 | } | |
d3b12f5d | 347 | |
ea26ce76 | 348 | g_main_context_prepare(context, &max_priority); |
42fe1c24 | 349 | n_poll_fds = g_main_context_query(context, max_priority, &poll_timeout, |
ea26ce76 PB |
350 | poll_fds, ARRAY_SIZE(poll_fds)); |
351 | g_assert(n_poll_fds <= ARRAY_SIZE(poll_fds)); | |
352 | ||
06ac7d49 | 353 | for (i = 0; i < w->num; i++) { |
58b9630d | 354 | poll_fds[n_poll_fds + i].fd = (DWORD_PTR)w->events[i]; |
ea26ce76 | 355 | poll_fds[n_poll_fds + i].events = G_IO_IN; |
06ac7d49 PB |
356 | } |
357 | ||
3239ad04 SW |
358 | if (poll_timeout < 0 || timeout < poll_timeout) { |
359 | poll_timeout = timeout; | |
360 | } | |
361 | ||
d3385eb4 | 362 | qemu_mutex_unlock_iothread(); |
5e3bc735 | 363 | g_poll_ret = g_poll(poll_fds, n_poll_fds + w->num, poll_timeout); |
d3385eb4 | 364 | qemu_mutex_lock_iothread(); |
5e3bc735 | 365 | if (g_poll_ret > 0) { |
06ac7d49 | 366 | for (i = 0; i < w->num; i++) { |
ea26ce76 | 367 | w->revents[i] = poll_fds[n_poll_fds + i].revents; |
d3385eb4 | 368 | } |
06ac7d49 PB |
369 | for (i = 0; i < w->num; i++) { |
370 | if (w->revents[i] && w->func[i]) { | |
371 | w->func[i](w->opaque[i]); | |
d3b12f5d | 372 | } |
d3b12f5d PB |
373 | } |
374 | } | |
375 | ||
ea26ce76 PB |
376 | if (g_main_context_check(context, max_priority, poll_fds, n_poll_fds)) { |
377 | g_main_context_dispatch(context); | |
378 | } | |
379 | ||
5e3bc735 FC |
380 | /* Call select after g_poll to avoid a useless iteration and therefore |
381 | * improve socket latency. | |
d3385eb4 PB |
382 | */ |
383 | ||
5e3bc735 FC |
384 | if (nfds >= 0) { |
385 | select_ret = select(nfds + 1, &rfds, &wfds, &xfds, &tv0); | |
386 | if (select_ret != 0) { | |
387 | timeout = 0; | |
388 | } | |
389 | } | |
390 | ||
391 | return select_ret || g_poll_ret; | |
d3b12f5d PB |
392 | } |
393 | #endif | |
394 | ||
395 | int main_loop_wait(int nonblocking) | |
396 | { | |
7c7db755 SS |
397 | int ret; |
398 | uint32_t timeout = UINT32_MAX; | |
d3b12f5d PB |
399 | |
400 | if (nonblocking) { | |
401 | timeout = 0; | |
d3b12f5d PB |
402 | } |
403 | ||
d3b12f5d PB |
404 | /* poll any events */ |
405 | /* XXX: separate device handlers from system ones */ | |
406 | nfds = -1; | |
407 | FD_ZERO(&rfds); | |
408 | FD_ZERO(&wfds); | |
409 | FD_ZERO(&xfds); | |
410 | ||
411 | #ifdef CONFIG_SLIRP | |
7c7db755 | 412 | slirp_update_timeout(&timeout); |
d3b12f5d PB |
413 | slirp_select_fill(&nfds, &rfds, &wfds, &xfds); |
414 | #endif | |
415 | qemu_iohandler_fill(&nfds, &rfds, &wfds, &xfds); | |
15455536 | 416 | ret = os_host_main_loop_wait(timeout); |
d3b12f5d PB |
417 | qemu_iohandler_poll(&rfds, &wfds, &xfds, ret); |
418 | #ifdef CONFIG_SLIRP | |
419 | slirp_select_poll(&rfds, &wfds, &xfds, (ret < 0)); | |
420 | #endif | |
421 | ||
422 | qemu_run_all_timers(); | |
423 | ||
d3b12f5d PB |
424 | return ret; |
425 | } | |
f627aab1 PB |
426 | |
427 | /* Functions to operate on the main QEMU AioContext. */ | |
428 | ||
429 | QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque) | |
430 | { | |
431 | return aio_bh_new(qemu_aio_context, cb, opaque); | |
432 | } | |
433 | ||
a915f4bc PB |
434 | bool qemu_aio_wait(void) |
435 | { | |
7c0628b2 | 436 | return aio_poll(qemu_aio_context, true); |
a915f4bc PB |
437 | } |
438 | ||
f42b2207 | 439 | #ifdef CONFIG_POSIX |
a915f4bc PB |
440 | void qemu_aio_set_fd_handler(int fd, |
441 | IOHandler *io_read, | |
442 | IOHandler *io_write, | |
443 | AioFlushHandler *io_flush, | |
444 | void *opaque) | |
445 | { | |
446 | aio_set_fd_handler(qemu_aio_context, fd, io_read, io_write, io_flush, | |
447 | opaque); | |
a915f4bc | 448 | } |
82cbbdc6 | 449 | #endif |
a915f4bc | 450 | |
a915f4bc PB |
451 | void qemu_aio_set_event_notifier(EventNotifier *notifier, |
452 | EventNotifierHandler *io_read, | |
453 | AioFlushEventNotifierHandler *io_flush) | |
454 | { | |
82cbbdc6 | 455 | aio_set_event_notifier(qemu_aio_context, notifier, io_read, io_flush); |
a915f4bc | 456 | } |