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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" |
d3b12f5d | 26 | #include "qemu-timer.h" |
0ec024f6 SW |
27 | #include "slirp/slirp.h" |
28 | #include "main-loop.h" | |
d3b12f5d PB |
29 | |
30 | #ifndef _WIN32 | |
31 | ||
0ec024f6 SW |
32 | #include "compatfd.h" |
33 | ||
d3b12f5d PB |
34 | static int io_thread_fd = -1; |
35 | ||
36 | void qemu_notify_event(void) | |
37 | { | |
38 | /* Write 8 bytes to be compatible with eventfd. */ | |
39 | static const uint64_t val = 1; | |
40 | ssize_t ret; | |
41 | ||
42 | if (io_thread_fd == -1) { | |
43 | return; | |
44 | } | |
45 | do { | |
46 | ret = write(io_thread_fd, &val, sizeof(val)); | |
47 | } while (ret < 0 && errno == EINTR); | |
48 | ||
49 | /* EAGAIN is fine, a read must be pending. */ | |
50 | if (ret < 0 && errno != EAGAIN) { | |
51 | fprintf(stderr, "qemu_notify_event: write() failed: %s\n", | |
52 | strerror(errno)); | |
53 | exit(1); | |
54 | } | |
55 | } | |
56 | ||
57 | static void qemu_event_read(void *opaque) | |
58 | { | |
59 | int fd = (intptr_t)opaque; | |
60 | ssize_t len; | |
61 | char buffer[512]; | |
62 | ||
63 | /* Drain the notify pipe. For eventfd, only 8 bytes will be read. */ | |
64 | do { | |
65 | len = read(fd, buffer, sizeof(buffer)); | |
66 | } while ((len == -1 && errno == EINTR) || len == sizeof(buffer)); | |
67 | } | |
68 | ||
69 | static int qemu_event_init(void) | |
70 | { | |
71 | int err; | |
72 | int fds[2]; | |
73 | ||
74 | err = qemu_eventfd(fds); | |
75 | if (err == -1) { | |
76 | return -errno; | |
77 | } | |
78 | err = fcntl_setfl(fds[0], O_NONBLOCK); | |
79 | if (err < 0) { | |
80 | goto fail; | |
81 | } | |
82 | err = fcntl_setfl(fds[1], O_NONBLOCK); | |
83 | if (err < 0) { | |
84 | goto fail; | |
85 | } | |
86 | qemu_set_fd_handler2(fds[0], NULL, qemu_event_read, NULL, | |
87 | (void *)(intptr_t)fds[0]); | |
88 | ||
89 | io_thread_fd = fds[1]; | |
90 | return 0; | |
91 | ||
92 | fail: | |
93 | close(fds[0]); | |
94 | close(fds[1]); | |
95 | return err; | |
96 | } | |
97 | ||
98 | /* If we have signalfd, we mask out the signals we want to handle and then | |
99 | * use signalfd to listen for them. We rely on whatever the current signal | |
100 | * handler is to dispatch the signals when we receive them. | |
101 | */ | |
102 | static void sigfd_handler(void *opaque) | |
103 | { | |
104 | int fd = (intptr_t)opaque; | |
105 | struct qemu_signalfd_siginfo info; | |
106 | struct sigaction action; | |
107 | ssize_t len; | |
108 | ||
109 | while (1) { | |
110 | do { | |
111 | len = read(fd, &info, sizeof(info)); | |
112 | } while (len == -1 && errno == EINTR); | |
113 | ||
114 | if (len == -1 && errno == EAGAIN) { | |
115 | break; | |
116 | } | |
117 | ||
118 | if (len != sizeof(info)) { | |
119 | printf("read from sigfd returned %zd: %m\n", len); | |
120 | return; | |
121 | } | |
122 | ||
123 | sigaction(info.ssi_signo, NULL, &action); | |
124 | if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) { | |
125 | action.sa_sigaction(info.ssi_signo, | |
126 | (siginfo_t *)&info, NULL); | |
127 | } else if (action.sa_handler) { | |
128 | action.sa_handler(info.ssi_signo); | |
129 | } | |
130 | } | |
131 | } | |
132 | ||
133 | static int qemu_signal_init(void) | |
134 | { | |
135 | int sigfd; | |
136 | sigset_t set; | |
137 | ||
138 | /* | |
139 | * SIG_IPI must be blocked in the main thread and must not be caught | |
140 | * by sigwait() in the signal thread. Otherwise, the cpu thread will | |
141 | * not catch it reliably. | |
142 | */ | |
143 | sigemptyset(&set); | |
144 | sigaddset(&set, SIG_IPI); | |
d3b12f5d PB |
145 | sigaddset(&set, SIGIO); |
146 | sigaddset(&set, SIGALRM); | |
147 | sigaddset(&set, SIGBUS); | |
148 | pthread_sigmask(SIG_BLOCK, &set, NULL); | |
149 | ||
4aa7534d | 150 | sigdelset(&set, SIG_IPI); |
d3b12f5d PB |
151 | sigfd = qemu_signalfd(&set); |
152 | if (sigfd == -1) { | |
153 | fprintf(stderr, "failed to create signalfd\n"); | |
154 | return -errno; | |
155 | } | |
156 | ||
157 | fcntl_setfl(sigfd, O_NONBLOCK); | |
158 | ||
159 | qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL, | |
160 | (void *)(intptr_t)sigfd); | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | #else /* _WIN32 */ | |
166 | ||
ee77dfb2 | 167 | HANDLE qemu_event_handle = NULL; |
d3b12f5d PB |
168 | |
169 | static void dummy_event_handler(void *opaque) | |
170 | { | |
171 | } | |
172 | ||
173 | static int qemu_event_init(void) | |
174 | { | |
175 | qemu_event_handle = CreateEvent(NULL, FALSE, FALSE, NULL); | |
176 | if (!qemu_event_handle) { | |
177 | fprintf(stderr, "Failed CreateEvent: %ld\n", GetLastError()); | |
178 | return -1; | |
179 | } | |
180 | qemu_add_wait_object(qemu_event_handle, dummy_event_handler, NULL); | |
181 | return 0; | |
182 | } | |
183 | ||
184 | void qemu_notify_event(void) | |
185 | { | |
ee77dfb2 MR |
186 | if (!qemu_event_handle) { |
187 | return; | |
188 | } | |
d3b12f5d PB |
189 | if (!SetEvent(qemu_event_handle)) { |
190 | fprintf(stderr, "qemu_notify_event: SetEvent failed: %ld\n", | |
191 | GetLastError()); | |
192 | exit(1); | |
193 | } | |
194 | } | |
195 | ||
196 | static int qemu_signal_init(void) | |
197 | { | |
198 | return 0; | |
199 | } | |
200 | #endif | |
201 | ||
d34e8f6e | 202 | int main_loop_init(void) |
d3b12f5d PB |
203 | { |
204 | int ret; | |
205 | ||
206 | qemu_mutex_lock_iothread(); | |
207 | ret = qemu_signal_init(); | |
208 | if (ret) { | |
209 | return ret; | |
210 | } | |
211 | ||
212 | /* Note eventfd must be drained before signalfd handlers run */ | |
213 | ret = qemu_event_init(); | |
214 | if (ret) { | |
215 | return ret; | |
216 | } | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | ||
222 | static GPollFD poll_fds[1024 * 2]; /* this is probably overkill */ | |
223 | static int n_poll_fds; | |
224 | static int max_priority; | |
225 | ||
226 | static void glib_select_fill(int *max_fd, fd_set *rfds, fd_set *wfds, | |
4dae83ae | 227 | fd_set *xfds, int *cur_timeout) |
d3b12f5d PB |
228 | { |
229 | GMainContext *context = g_main_context_default(); | |
230 | int i; | |
4dae83ae | 231 | int timeout = 0; |
d3b12f5d PB |
232 | |
233 | g_main_context_prepare(context, &max_priority); | |
234 | ||
235 | n_poll_fds = g_main_context_query(context, max_priority, &timeout, | |
236 | poll_fds, ARRAY_SIZE(poll_fds)); | |
237 | g_assert(n_poll_fds <= ARRAY_SIZE(poll_fds)); | |
238 | ||
239 | for (i = 0; i < n_poll_fds; i++) { | |
240 | GPollFD *p = &poll_fds[i]; | |
241 | ||
242 | if ((p->events & G_IO_IN)) { | |
243 | FD_SET(p->fd, rfds); | |
244 | *max_fd = MAX(*max_fd, p->fd); | |
245 | } | |
246 | if ((p->events & G_IO_OUT)) { | |
247 | FD_SET(p->fd, wfds); | |
248 | *max_fd = MAX(*max_fd, p->fd); | |
249 | } | |
250 | if ((p->events & G_IO_ERR)) { | |
251 | FD_SET(p->fd, xfds); | |
252 | *max_fd = MAX(*max_fd, p->fd); | |
253 | } | |
254 | } | |
255 | ||
4dae83ae PB |
256 | if (timeout >= 0 && timeout < *cur_timeout) { |
257 | *cur_timeout = timeout; | |
d3b12f5d PB |
258 | } |
259 | } | |
260 | ||
261 | static void glib_select_poll(fd_set *rfds, fd_set *wfds, fd_set *xfds, | |
262 | bool err) | |
263 | { | |
264 | GMainContext *context = g_main_context_default(); | |
265 | ||
266 | if (!err) { | |
267 | int i; | |
268 | ||
269 | for (i = 0; i < n_poll_fds; i++) { | |
270 | GPollFD *p = &poll_fds[i]; | |
271 | ||
272 | if ((p->events & G_IO_IN) && FD_ISSET(p->fd, rfds)) { | |
273 | p->revents |= G_IO_IN; | |
274 | } | |
275 | if ((p->events & G_IO_OUT) && FD_ISSET(p->fd, wfds)) { | |
276 | p->revents |= G_IO_OUT; | |
277 | } | |
278 | if ((p->events & G_IO_ERR) && FD_ISSET(p->fd, xfds)) { | |
279 | p->revents |= G_IO_ERR; | |
280 | } | |
281 | } | |
282 | } | |
283 | ||
284 | if (g_main_context_check(context, max_priority, poll_fds, n_poll_fds)) { | |
285 | g_main_context_dispatch(context); | |
286 | } | |
287 | } | |
288 | ||
289 | #ifdef _WIN32 | |
290 | /***********************************************************/ | |
291 | /* Polling handling */ | |
292 | ||
293 | typedef struct PollingEntry { | |
294 | PollingFunc *func; | |
295 | void *opaque; | |
296 | struct PollingEntry *next; | |
297 | } PollingEntry; | |
298 | ||
299 | static PollingEntry *first_polling_entry; | |
300 | ||
301 | int qemu_add_polling_cb(PollingFunc *func, void *opaque) | |
302 | { | |
303 | PollingEntry **ppe, *pe; | |
304 | pe = g_malloc0(sizeof(PollingEntry)); | |
305 | pe->func = func; | |
306 | pe->opaque = opaque; | |
307 | for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next); | |
308 | *ppe = pe; | |
309 | return 0; | |
310 | } | |
311 | ||
312 | void qemu_del_polling_cb(PollingFunc *func, void *opaque) | |
313 | { | |
314 | PollingEntry **ppe, *pe; | |
315 | for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next) { | |
316 | pe = *ppe; | |
317 | if (pe->func == func && pe->opaque == opaque) { | |
318 | *ppe = pe->next; | |
319 | g_free(pe); | |
320 | break; | |
321 | } | |
322 | } | |
323 | } | |
324 | ||
325 | /***********************************************************/ | |
326 | /* Wait objects support */ | |
327 | typedef struct WaitObjects { | |
328 | int num; | |
329 | HANDLE events[MAXIMUM_WAIT_OBJECTS + 1]; | |
330 | WaitObjectFunc *func[MAXIMUM_WAIT_OBJECTS + 1]; | |
331 | void *opaque[MAXIMUM_WAIT_OBJECTS + 1]; | |
332 | } WaitObjects; | |
333 | ||
334 | static WaitObjects wait_objects = {0}; | |
335 | ||
336 | int qemu_add_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque) | |
337 | { | |
338 | WaitObjects *w = &wait_objects; | |
339 | if (w->num >= MAXIMUM_WAIT_OBJECTS) { | |
340 | return -1; | |
341 | } | |
342 | w->events[w->num] = handle; | |
343 | w->func[w->num] = func; | |
344 | w->opaque[w->num] = opaque; | |
345 | w->num++; | |
346 | return 0; | |
347 | } | |
348 | ||
349 | void qemu_del_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque) | |
350 | { | |
351 | int i, found; | |
352 | WaitObjects *w = &wait_objects; | |
353 | ||
354 | found = 0; | |
355 | for (i = 0; i < w->num; i++) { | |
356 | if (w->events[i] == handle) { | |
357 | found = 1; | |
358 | } | |
359 | if (found) { | |
360 | w->events[i] = w->events[i + 1]; | |
361 | w->func[i] = w->func[i + 1]; | |
362 | w->opaque[i] = w->opaque[i + 1]; | |
363 | } | |
364 | } | |
365 | if (found) { | |
366 | w->num--; | |
367 | } | |
368 | } | |
369 | ||
370 | static void os_host_main_loop_wait(int *timeout) | |
371 | { | |
372 | int ret, ret2, i; | |
373 | PollingEntry *pe; | |
374 | ||
375 | /* XXX: need to suppress polling by better using win32 events */ | |
376 | ret = 0; | |
377 | for (pe = first_polling_entry; pe != NULL; pe = pe->next) { | |
378 | ret |= pe->func(pe->opaque); | |
379 | } | |
380 | if (ret == 0) { | |
381 | int err; | |
382 | WaitObjects *w = &wait_objects; | |
383 | ||
384 | qemu_mutex_unlock_iothread(); | |
385 | ret = WaitForMultipleObjects(w->num, w->events, FALSE, *timeout); | |
386 | qemu_mutex_lock_iothread(); | |
387 | if (WAIT_OBJECT_0 + 0 <= ret && ret <= WAIT_OBJECT_0 + w->num - 1) { | |
388 | if (w->func[ret - WAIT_OBJECT_0]) { | |
389 | w->func[ret - WAIT_OBJECT_0](w->opaque[ret - WAIT_OBJECT_0]); | |
390 | } | |
391 | ||
392 | /* Check for additional signaled events */ | |
393 | for (i = (ret - WAIT_OBJECT_0 + 1); i < w->num; i++) { | |
394 | /* Check if event is signaled */ | |
395 | ret2 = WaitForSingleObject(w->events[i], 0); | |
396 | if (ret2 == WAIT_OBJECT_0) { | |
397 | if (w->func[i]) { | |
398 | w->func[i](w->opaque[i]); | |
399 | } | |
400 | } else if (ret2 != WAIT_TIMEOUT) { | |
401 | err = GetLastError(); | |
402 | fprintf(stderr, "WaitForSingleObject error %d %d\n", i, err); | |
403 | } | |
404 | } | |
405 | } else if (ret != WAIT_TIMEOUT) { | |
406 | err = GetLastError(); | |
407 | fprintf(stderr, "WaitForMultipleObjects error %d %d\n", ret, err); | |
408 | } | |
409 | } | |
410 | ||
411 | *timeout = 0; | |
412 | } | |
413 | #else | |
414 | static inline void os_host_main_loop_wait(int *timeout) | |
415 | { | |
416 | } | |
417 | #endif | |
418 | ||
419 | int main_loop_wait(int nonblocking) | |
420 | { | |
421 | fd_set rfds, wfds, xfds; | |
422 | int ret, nfds; | |
423 | struct timeval tv; | |
424 | int timeout; | |
425 | ||
426 | if (nonblocking) { | |
427 | timeout = 0; | |
428 | } else { | |
429 | timeout = qemu_calculate_timeout(); | |
430 | qemu_bh_update_timeout(&timeout); | |
431 | } | |
432 | ||
d3b12f5d PB |
433 | /* poll any events */ |
434 | /* XXX: separate device handlers from system ones */ | |
435 | nfds = -1; | |
436 | FD_ZERO(&rfds); | |
437 | FD_ZERO(&wfds); | |
438 | FD_ZERO(&xfds); | |
439 | ||
440 | #ifdef CONFIG_SLIRP | |
441 | slirp_select_fill(&nfds, &rfds, &wfds, &xfds); | |
442 | #endif | |
443 | qemu_iohandler_fill(&nfds, &rfds, &wfds, &xfds); | |
4dae83ae PB |
444 | |
445 | glib_select_fill(&nfds, &rfds, &wfds, &xfds, &timeout); | |
446 | os_host_main_loop_wait(&timeout); | |
447 | ||
448 | tv.tv_sec = timeout / 1000; | |
449 | tv.tv_usec = (timeout % 1000) * 1000; | |
d3b12f5d PB |
450 | |
451 | if (timeout > 0) { | |
452 | qemu_mutex_unlock_iothread(); | |
453 | } | |
454 | ||
455 | ret = select(nfds + 1, &rfds, &wfds, &xfds, &tv); | |
456 | ||
457 | if (timeout > 0) { | |
458 | qemu_mutex_lock_iothread(); | |
459 | } | |
460 | ||
461 | glib_select_poll(&rfds, &wfds, &xfds, (ret < 0)); | |
462 | qemu_iohandler_poll(&rfds, &wfds, &xfds, ret); | |
463 | #ifdef CONFIG_SLIRP | |
464 | slirp_select_poll(&rfds, &wfds, &xfds, (ret < 0)); | |
465 | #endif | |
466 | ||
467 | qemu_run_all_timers(); | |
468 | ||
469 | /* Check bottom-halves last in case any of the earlier events triggered | |
470 | them. */ | |
471 | qemu_bh_poll(); | |
472 | ||
473 | return ret; | |
474 | } |