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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" |
01c22f2c | 29 | #include "sysemu/qtest.h" |
d2528bdc | 30 | #include "sysemu/cpus.h" |
d759c951 | 31 | #include "sysemu/replay.h" |
1de7afc9 | 32 | #include "qemu/main-loop.h" |
737e150e | 33 | #include "block/aio.h" |
8297be80 | 34 | #include "qemu/error-report.h" |
e9ed92bd PB |
35 | #include "qemu/queue.h" |
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 | */ | |
47 | static void sigfd_handler(void *opaque) | |
48 | { | |
49 | int fd = (intptr_t)opaque; | |
50 | struct qemu_signalfd_siginfo info; | |
51 | struct sigaction action; | |
52 | ssize_t len; | |
53 | ||
54 | while (1) { | |
55 | do { | |
56 | len = read(fd, &info, sizeof(info)); | |
57 | } while (len == -1 && errno == EINTR); | |
58 | ||
59 | if (len == -1 && errno == EAGAIN) { | |
60 | break; | |
61 | } | |
62 | ||
63 | if (len != sizeof(info)) { | |
372a87a1 TH |
64 | error_report("read from sigfd returned %zd: %s", len, |
65 | g_strerror(errno)); | |
d3b12f5d PB |
66 | return; |
67 | } | |
68 | ||
69 | sigaction(info.ssi_signo, NULL, &action); | |
70 | if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) { | |
d98d4072 | 71 | sigaction_invoke(&action, &info); |
d3b12f5d PB |
72 | } else if (action.sa_handler) { |
73 | action.sa_handler(info.ssi_signo); | |
74 | } | |
75 | } | |
76 | } | |
77 | ||
78524330 | 78 | static int qemu_signal_init(Error **errp) |
d3b12f5d PB |
79 | { |
80 | int sigfd; | |
81 | sigset_t set; | |
82 | ||
83 | /* | |
84 | * SIG_IPI must be blocked in the main thread and must not be caught | |
85 | * by sigwait() in the signal thread. Otherwise, the cpu thread will | |
86 | * not catch it reliably. | |
87 | */ | |
88 | sigemptyset(&set); | |
89 | sigaddset(&set, SIG_IPI); | |
d3b12f5d PB |
90 | sigaddset(&set, SIGIO); |
91 | sigaddset(&set, SIGALRM); | |
92 | sigaddset(&set, SIGBUS); | |
3e9418e1 JK |
93 | /* SIGINT cannot be handled via signalfd, so that ^C can be used |
94 | * to interrupt QEMU when it is being run under gdb. SIGHUP and | |
95 | * SIGTERM are also handled asynchronously, even though it is not | |
96 | * strictly necessary, because they use the same handler as SIGINT. | |
97 | */ | |
d3b12f5d PB |
98 | pthread_sigmask(SIG_BLOCK, &set, NULL); |
99 | ||
4aa7534d | 100 | sigdelset(&set, SIG_IPI); |
d3b12f5d PB |
101 | sigfd = qemu_signalfd(&set); |
102 | if (sigfd == -1) { | |
78524330 | 103 | error_setg_errno(errp, errno, "failed to create signalfd"); |
d3b12f5d PB |
104 | return -errno; |
105 | } | |
106 | ||
107 | fcntl_setfl(sigfd, O_NONBLOCK); | |
108 | ||
82e1cc4b | 109 | qemu_set_fd_handler(sigfd, sigfd_handler, NULL, (void *)(intptr_t)sigfd); |
d3b12f5d PB |
110 | |
111 | return 0; | |
112 | } | |
113 | ||
114 | #else /* _WIN32 */ | |
115 | ||
78524330 | 116 | static int qemu_signal_init(Error **errp) |
d3b12f5d | 117 | { |
d3b12f5d PB |
118 | return 0; |
119 | } | |
4c8d0d27 PB |
120 | #endif |
121 | ||
122 | static AioContext *qemu_aio_context; | |
edec47cf PB |
123 | static QEMUBH *qemu_notify_bh; |
124 | ||
125 | static void notify_event_cb(void *opaque) | |
126 | { | |
127 | /* No need to do anything; this bottom half is only used to | |
128 | * kick the kernel out of ppoll/poll/WaitForMultipleObjects. | |
129 | */ | |
130 | } | |
d3b12f5d | 131 | |
5f3aa1ff SH |
132 | AioContext *qemu_get_aio_context(void) |
133 | { | |
134 | return qemu_aio_context; | |
135 | } | |
136 | ||
d3b12f5d PB |
137 | void qemu_notify_event(void) |
138 | { | |
4c8d0d27 | 139 | if (!qemu_aio_context) { |
ee77dfb2 MR |
140 | return; |
141 | } | |
edec47cf | 142 | qemu_bh_schedule(qemu_notify_bh); |
d3b12f5d PB |
143 | } |
144 | ||
cbff4b34 SH |
145 | static GArray *gpollfds; |
146 | ||
2f78e491 | 147 | int qemu_init_main_loop(Error **errp) |
d3b12f5d PB |
148 | { |
149 | int ret; | |
82cbbdc6 | 150 | GSource *src; |
d3b12f5d | 151 | |
3f53bc61 | 152 | init_clocks(qemu_timer_notify_cb); |
172061a0 | 153 | |
78524330 | 154 | ret = qemu_signal_init(errp); |
d3b12f5d PB |
155 | if (ret) { |
156 | return ret; | |
157 | } | |
158 | ||
668f62ec | 159 | qemu_aio_context = aio_context_new(errp); |
2f78e491 | 160 | if (!qemu_aio_context) { |
2f78e491 CN |
161 | return -EMFILE; |
162 | } | |
28ba61e7 | 163 | qemu_notify_bh = qemu_bh_new(notify_event_cb, NULL); |
cbff4b34 | 164 | gpollfds = g_array_new(FALSE, FALSE, sizeof(GPollFD)); |
82cbbdc6 | 165 | src = aio_get_g_source(qemu_aio_context); |
c3ff757d | 166 | g_source_set_name(src, "aio-context"); |
82cbbdc6 PB |
167 | g_source_attach(src, NULL); |
168 | g_source_unref(src); | |
f3926945 | 169 | src = iohandler_get_g_source(); |
c3ff757d | 170 | g_source_set_name(src, "io-handler"); |
f3926945 FZ |
171 | g_source_attach(src, NULL); |
172 | g_source_unref(src); | |
d3b12f5d PB |
173 | return 0; |
174 | } | |
175 | ||
d3b12f5d PB |
176 | static int max_priority; |
177 | ||
ea26ce76 | 178 | #ifndef _WIN32 |
48ce11ff SH |
179 | static int glib_pollfds_idx; |
180 | static int glib_n_poll_fds; | |
181 | ||
8c278762 TH |
182 | void qemu_fd_register(int fd) |
183 | { | |
184 | } | |
185 | ||
7b595f35 | 186 | static void glib_pollfds_fill(int64_t *cur_timeout) |
d3b12f5d PB |
187 | { |
188 | GMainContext *context = g_main_context_default(); | |
4dae83ae | 189 | int timeout = 0; |
7b595f35 | 190 | int64_t timeout_ns; |
48ce11ff | 191 | int n; |
d3b12f5d PB |
192 | |
193 | g_main_context_prepare(context, &max_priority); | |
194 | ||
48ce11ff SH |
195 | glib_pollfds_idx = gpollfds->len; |
196 | n = glib_n_poll_fds; | |
197 | do { | |
198 | GPollFD *pfds; | |
199 | glib_n_poll_fds = n; | |
200 | g_array_set_size(gpollfds, glib_pollfds_idx + glib_n_poll_fds); | |
201 | pfds = &g_array_index(gpollfds, GPollFD, glib_pollfds_idx); | |
202 | n = g_main_context_query(context, max_priority, &timeout, pfds, | |
203 | glib_n_poll_fds); | |
204 | } while (n != glib_n_poll_fds); | |
d3b12f5d | 205 | |
7b595f35 AB |
206 | if (timeout < 0) { |
207 | timeout_ns = -1; | |
208 | } else { | |
209 | timeout_ns = (int64_t)timeout * (int64_t)SCALE_MS; | |
d3b12f5d | 210 | } |
7b595f35 AB |
211 | |
212 | *cur_timeout = qemu_soonest_timeout(timeout_ns, *cur_timeout); | |
d3b12f5d PB |
213 | } |
214 | ||
48ce11ff | 215 | static void glib_pollfds_poll(void) |
d3b12f5d PB |
216 | { |
217 | GMainContext *context = g_main_context_default(); | |
48ce11ff | 218 | GPollFD *pfds = &g_array_index(gpollfds, GPollFD, glib_pollfds_idx); |
d3b12f5d | 219 | |
48ce11ff | 220 | if (g_main_context_check(context, max_priority, pfds, glib_n_poll_fds)) { |
d3b12f5d PB |
221 | g_main_context_dispatch(context); |
222 | } | |
223 | } | |
224 | ||
893986fe AL |
225 | #define MAX_MAIN_LOOP_SPIN (1000) |
226 | ||
7b595f35 | 227 | static int os_host_main_loop_wait(int64_t timeout) |
15455536 | 228 | { |
ecbddbb1 | 229 | GMainContext *context = g_main_context_default(); |
15455536 PB |
230 | int ret; |
231 | ||
ecbddbb1 RJ |
232 | g_main_context_acquire(context); |
233 | ||
48ce11ff | 234 | glib_pollfds_fill(&timeout); |
15455536 | 235 | |
d759c951 AB |
236 | qemu_mutex_unlock_iothread(); |
237 | replay_mutex_unlock(); | |
15455536 | 238 | |
7b595f35 | 239 | ret = qemu_poll_ns((GPollFD *)gpollfds->data, gpollfds->len, timeout); |
cbff4b34 | 240 | |
d759c951 AB |
241 | replay_mutex_lock(); |
242 | qemu_mutex_lock_iothread(); | |
15455536 | 243 | |
48ce11ff | 244 | glib_pollfds_poll(); |
ecbddbb1 RJ |
245 | |
246 | g_main_context_release(context); | |
247 | ||
15455536 PB |
248 | return ret; |
249 | } | |
250 | #else | |
d3b12f5d PB |
251 | /***********************************************************/ |
252 | /* Polling handling */ | |
253 | ||
254 | typedef struct PollingEntry { | |
255 | PollingFunc *func; | |
256 | void *opaque; | |
257 | struct PollingEntry *next; | |
258 | } PollingEntry; | |
259 | ||
260 | static PollingEntry *first_polling_entry; | |
261 | ||
262 | int qemu_add_polling_cb(PollingFunc *func, void *opaque) | |
263 | { | |
264 | PollingEntry **ppe, *pe; | |
265 | pe = g_malloc0(sizeof(PollingEntry)); | |
266 | pe->func = func; | |
267 | pe->opaque = opaque; | |
268 | for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next); | |
269 | *ppe = pe; | |
270 | return 0; | |
271 | } | |
272 | ||
273 | void qemu_del_polling_cb(PollingFunc *func, void *opaque) | |
274 | { | |
275 | PollingEntry **ppe, *pe; | |
276 | for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next) { | |
277 | pe = *ppe; | |
278 | if (pe->func == func && pe->opaque == opaque) { | |
279 | *ppe = pe->next; | |
280 | g_free(pe); | |
281 | break; | |
282 | } | |
283 | } | |
284 | } | |
285 | ||
286 | /***********************************************************/ | |
287 | /* Wait objects support */ | |
288 | typedef struct WaitObjects { | |
289 | int num; | |
06ac7d49 | 290 | int revents[MAXIMUM_WAIT_OBJECTS + 1]; |
d3b12f5d PB |
291 | HANDLE events[MAXIMUM_WAIT_OBJECTS + 1]; |
292 | WaitObjectFunc *func[MAXIMUM_WAIT_OBJECTS + 1]; | |
293 | void *opaque[MAXIMUM_WAIT_OBJECTS + 1]; | |
294 | } WaitObjects; | |
295 | ||
296 | static WaitObjects wait_objects = {0}; | |
297 | ||
298 | int qemu_add_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque) | |
299 | { | |
300 | WaitObjects *w = &wait_objects; | |
301 | if (w->num >= MAXIMUM_WAIT_OBJECTS) { | |
302 | return -1; | |
303 | } | |
304 | w->events[w->num] = handle; | |
305 | w->func[w->num] = func; | |
306 | w->opaque[w->num] = opaque; | |
06ac7d49 | 307 | w->revents[w->num] = 0; |
d3b12f5d PB |
308 | w->num++; |
309 | return 0; | |
310 | } | |
311 | ||
312 | void qemu_del_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque) | |
313 | { | |
314 | int i, found; | |
315 | WaitObjects *w = &wait_objects; | |
316 | ||
317 | found = 0; | |
318 | for (i = 0; i < w->num; i++) { | |
319 | if (w->events[i] == handle) { | |
320 | found = 1; | |
321 | } | |
322 | if (found) { | |
323 | w->events[i] = w->events[i + 1]; | |
324 | w->func[i] = w->func[i + 1]; | |
325 | w->opaque[i] = w->opaque[i + 1]; | |
06ac7d49 | 326 | w->revents[i] = w->revents[i + 1]; |
d3b12f5d PB |
327 | } |
328 | } | |
329 | if (found) { | |
330 | w->num--; | |
331 | } | |
332 | } | |
333 | ||
d3385eb4 PB |
334 | void qemu_fd_register(int fd) |
335 | { | |
4c8d0d27 PB |
336 | WSAEventSelect(fd, event_notifier_get_handle(&qemu_aio_context->notifier), |
337 | FD_READ | FD_ACCEPT | FD_CLOSE | | |
d3385eb4 PB |
338 | FD_CONNECT | FD_WRITE | FD_OOB); |
339 | } | |
340 | ||
cbff4b34 SH |
341 | static int pollfds_fill(GArray *pollfds, fd_set *rfds, fd_set *wfds, |
342 | fd_set *xfds) | |
343 | { | |
344 | int nfds = -1; | |
345 | int i; | |
346 | ||
347 | for (i = 0; i < pollfds->len; i++) { | |
348 | GPollFD *pfd = &g_array_index(pollfds, GPollFD, i); | |
349 | int fd = pfd->fd; | |
350 | int events = pfd->events; | |
8db165b3 | 351 | if (events & G_IO_IN) { |
cbff4b34 SH |
352 | FD_SET(fd, rfds); |
353 | nfds = MAX(nfds, fd); | |
354 | } | |
8db165b3 | 355 | if (events & G_IO_OUT) { |
cbff4b34 SH |
356 | FD_SET(fd, wfds); |
357 | nfds = MAX(nfds, fd); | |
358 | } | |
359 | if (events & G_IO_PRI) { | |
360 | FD_SET(fd, xfds); | |
361 | nfds = MAX(nfds, fd); | |
362 | } | |
363 | } | |
364 | return nfds; | |
365 | } | |
366 | ||
367 | static void pollfds_poll(GArray *pollfds, int nfds, fd_set *rfds, | |
368 | fd_set *wfds, fd_set *xfds) | |
369 | { | |
370 | int i; | |
371 | ||
372 | for (i = 0; i < pollfds->len; i++) { | |
373 | GPollFD *pfd = &g_array_index(pollfds, GPollFD, i); | |
374 | int fd = pfd->fd; | |
375 | int revents = 0; | |
376 | ||
377 | if (FD_ISSET(fd, rfds)) { | |
8db165b3 | 378 | revents |= G_IO_IN; |
cbff4b34 SH |
379 | } |
380 | if (FD_ISSET(fd, wfds)) { | |
8db165b3 | 381 | revents |= G_IO_OUT; |
cbff4b34 SH |
382 | } |
383 | if (FD_ISSET(fd, xfds)) { | |
384 | revents |= G_IO_PRI; | |
385 | } | |
386 | pfd->revents = revents & pfd->events; | |
387 | } | |
388 | } | |
389 | ||
7b595f35 | 390 | static int os_host_main_loop_wait(int64_t timeout) |
d3b12f5d | 391 | { |
ea26ce76 | 392 | GMainContext *context = g_main_context_default(); |
48ce11ff | 393 | GPollFD poll_fds[1024 * 2]; /* this is probably overkill */ |
134a03e0 | 394 | int select_ret = 0; |
48ce11ff | 395 | int g_poll_ret, ret, i, n_poll_fds; |
d3b12f5d | 396 | PollingEntry *pe; |
d3385eb4 | 397 | WaitObjects *w = &wait_objects; |
42fe1c24 | 398 | gint poll_timeout; |
7b595f35 | 399 | int64_t poll_timeout_ns; |
15455536 | 400 | static struct timeval tv0; |
9cbaacf9 SH |
401 | fd_set rfds, wfds, xfds; |
402 | int nfds; | |
d3b12f5d | 403 | |
ecbddbb1 RJ |
404 | g_main_context_acquire(context); |
405 | ||
d3b12f5d PB |
406 | /* XXX: need to suppress polling by better using win32 events */ |
407 | ret = 0; | |
408 | for (pe = first_polling_entry; pe != NULL; pe = pe->next) { | |
409 | ret |= pe->func(pe->opaque); | |
410 | } | |
d3385eb4 | 411 | if (ret != 0) { |
ecbddbb1 | 412 | g_main_context_release(context); |
d3385eb4 PB |
413 | return ret; |
414 | } | |
d3b12f5d | 415 | |
3cb8c205 SH |
416 | FD_ZERO(&rfds); |
417 | FD_ZERO(&wfds); | |
418 | FD_ZERO(&xfds); | |
419 | nfds = pollfds_fill(gpollfds, &rfds, &wfds, &xfds); | |
420 | if (nfds >= 0) { | |
421 | select_ret = select(nfds + 1, &rfds, &wfds, &xfds, &tv0); | |
422 | if (select_ret != 0) { | |
423 | timeout = 0; | |
424 | } | |
425 | if (select_ret > 0) { | |
426 | pollfds_poll(gpollfds, nfds, &rfds, &wfds, &xfds); | |
427 | } | |
428 | } | |
429 | ||
ea26ce76 | 430 | g_main_context_prepare(context, &max_priority); |
42fe1c24 | 431 | n_poll_fds = g_main_context_query(context, max_priority, &poll_timeout, |
ea26ce76 | 432 | poll_fds, ARRAY_SIZE(poll_fds)); |
6512e34b | 433 | g_assert(n_poll_fds + w->num <= ARRAY_SIZE(poll_fds)); |
ea26ce76 | 434 | |
06ac7d49 | 435 | for (i = 0; i < w->num; i++) { |
58b9630d | 436 | poll_fds[n_poll_fds + i].fd = (DWORD_PTR)w->events[i]; |
ea26ce76 | 437 | poll_fds[n_poll_fds + i].events = G_IO_IN; |
06ac7d49 PB |
438 | } |
439 | ||
7b595f35 AB |
440 | if (poll_timeout < 0) { |
441 | poll_timeout_ns = -1; | |
442 | } else { | |
443 | poll_timeout_ns = (int64_t)poll_timeout * (int64_t)SCALE_MS; | |
3239ad04 SW |
444 | } |
445 | ||
7b595f35 AB |
446 | poll_timeout_ns = qemu_soonest_timeout(poll_timeout_ns, timeout); |
447 | ||
d3385eb4 | 448 | qemu_mutex_unlock_iothread(); |
d759c951 AB |
449 | |
450 | replay_mutex_unlock(); | |
451 | ||
7b595f35 AB |
452 | g_poll_ret = qemu_poll_ns(poll_fds, n_poll_fds + w->num, poll_timeout_ns); |
453 | ||
d759c951 AB |
454 | replay_mutex_lock(); |
455 | ||
d3385eb4 | 456 | qemu_mutex_lock_iothread(); |
5e3bc735 | 457 | if (g_poll_ret > 0) { |
06ac7d49 | 458 | for (i = 0; i < w->num; i++) { |
ea26ce76 | 459 | w->revents[i] = poll_fds[n_poll_fds + i].revents; |
d3385eb4 | 460 | } |
06ac7d49 PB |
461 | for (i = 0; i < w->num; i++) { |
462 | if (w->revents[i] && w->func[i]) { | |
463 | w->func[i](w->opaque[i]); | |
d3b12f5d | 464 | } |
d3b12f5d PB |
465 | } |
466 | } | |
467 | ||
ea26ce76 PB |
468 | if (g_main_context_check(context, max_priority, poll_fds, n_poll_fds)) { |
469 | g_main_context_dispatch(context); | |
470 | } | |
471 | ||
ecbddbb1 RJ |
472 | g_main_context_release(context); |
473 | ||
5e3bc735 | 474 | return select_ret || g_poll_ret; |
d3b12f5d PB |
475 | } |
476 | #endif | |
477 | ||
1ab67b98 MAL |
478 | static NotifierList main_loop_poll_notifiers = |
479 | NOTIFIER_LIST_INITIALIZER(main_loop_poll_notifiers); | |
480 | ||
481 | void main_loop_poll_add_notifier(Notifier *notify) | |
482 | { | |
483 | notifier_list_add(&main_loop_poll_notifiers, notify); | |
484 | } | |
485 | ||
486 | void main_loop_poll_remove_notifier(Notifier *notify) | |
487 | { | |
488 | notifier_remove(notify); | |
489 | } | |
490 | ||
de5f852f | 491 | void main_loop_wait(int nonblocking) |
d3b12f5d | 492 | { |
1ab67b98 MAL |
493 | MainLoopPoll mlpoll = { |
494 | .state = MAIN_LOOP_POLL_FILL, | |
495 | .timeout = UINT32_MAX, | |
496 | .pollfds = gpollfds, | |
497 | }; | |
7c7db755 | 498 | int ret; |
7b595f35 | 499 | int64_t timeout_ns; |
d3b12f5d PB |
500 | |
501 | if (nonblocking) { | |
1ab67b98 | 502 | mlpoll.timeout = 0; |
d3b12f5d PB |
503 | } |
504 | ||
d3b12f5d | 505 | /* poll any events */ |
cbff4b34 | 506 | g_array_set_size(gpollfds, 0); /* reset for new iteration */ |
d3b12f5d | 507 | /* XXX: separate device handlers from system ones */ |
1ab67b98 | 508 | notifier_list_notify(&main_loop_poll_notifiers, &mlpoll); |
7b595f35 | 509 | |
1ab67b98 | 510 | if (mlpoll.timeout == UINT32_MAX) { |
7b595f35 AB |
511 | timeout_ns = -1; |
512 | } else { | |
1ab67b98 | 513 | timeout_ns = (uint64_t)mlpoll.timeout * (int64_t)(SCALE_MS); |
7b595f35 AB |
514 | } |
515 | ||
516 | timeout_ns = qemu_soonest_timeout(timeout_ns, | |
517 | timerlistgroup_deadline_ns( | |
518 | &main_loop_tlg)); | |
519 | ||
520 | ret = os_host_main_loop_wait(timeout_ns); | |
1ab67b98 MAL |
521 | mlpoll.state = ret < 0 ? MAIN_LOOP_POLL_ERR : MAIN_LOOP_POLL_OK; |
522 | notifier_list_notify(&main_loop_poll_notifiers, &mlpoll); | |
d3b12f5d | 523 | |
efab87cf PD |
524 | /* CPU thread can infinitely wait for event after |
525 | missing the warp */ | |
e76d1798 | 526 | qemu_start_warp_timer(); |
40daca54 | 527 | qemu_clock_run_all_timers(); |
d3b12f5d | 528 | } |
f627aab1 PB |
529 | |
530 | /* Functions to operate on the main QEMU AioContext. */ | |
531 | ||
532 | QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque) | |
533 | { | |
534 | return aio_bh_new(qemu_aio_context, cb, opaque); | |
535 | } | |
e9ed92bd PB |
536 | |
537 | /* | |
538 | * Functions to operate on the I/O handler AioContext. | |
539 | * This context runs on top of main loop. We can't reuse qemu_aio_context | |
540 | * because iohandlers mustn't be polled by aio_poll(qemu_aio_context). | |
541 | */ | |
542 | static AioContext *iohandler_ctx; | |
543 | ||
544 | static void iohandler_init(void) | |
545 | { | |
546 | if (!iohandler_ctx) { | |
547 | iohandler_ctx = aio_context_new(&error_abort); | |
548 | } | |
549 | } | |
550 | ||
551 | AioContext *iohandler_get_aio_context(void) | |
552 | { | |
553 | iohandler_init(); | |
554 | return iohandler_ctx; | |
555 | } | |
556 | ||
557 | GSource *iohandler_get_g_source(void) | |
558 | { | |
559 | iohandler_init(); | |
560 | return aio_get_g_source(iohandler_ctx); | |
561 | } | |
562 | ||
563 | void qemu_set_fd_handler(int fd, | |
564 | IOHandler *fd_read, | |
565 | IOHandler *fd_write, | |
566 | void *opaque) | |
567 | { | |
568 | iohandler_init(); | |
569 | aio_set_fd_handler(iohandler_ctx, fd, false, | |
570 | fd_read, fd_write, NULL, opaque); | |
571 | } | |
572 | ||
573 | void event_notifier_set_handler(EventNotifier *e, | |
574 | EventNotifierHandler *handler) | |
575 | { | |
576 | iohandler_init(); | |
577 | aio_set_event_notifier(iohandler_ctx, e, false, | |
578 | handler, NULL); | |
579 | } | |
580 | ||
581 | /* reaping of zombies. right now we're not passing the status to | |
582 | anyone, but it would be possible to add a callback. */ | |
583 | #ifndef _WIN32 | |
584 | typedef struct ChildProcessRecord { | |
585 | int pid; | |
586 | QLIST_ENTRY(ChildProcessRecord) next; | |
587 | } ChildProcessRecord; | |
588 | ||
589 | static QLIST_HEAD(, ChildProcessRecord) child_watches = | |
590 | QLIST_HEAD_INITIALIZER(child_watches); | |
591 | ||
592 | static QEMUBH *sigchld_bh; | |
593 | ||
594 | static void sigchld_handler(int signal) | |
595 | { | |
596 | qemu_bh_schedule(sigchld_bh); | |
597 | } | |
598 | ||
599 | static void sigchld_bh_handler(void *opaque) | |
600 | { | |
601 | ChildProcessRecord *rec, *next; | |
602 | ||
603 | QLIST_FOREACH_SAFE(rec, &child_watches, next, next) { | |
604 | if (waitpid(rec->pid, NULL, WNOHANG) == rec->pid) { | |
605 | QLIST_REMOVE(rec, next); | |
606 | g_free(rec); | |
607 | } | |
608 | } | |
609 | } | |
610 | ||
611 | static void qemu_init_child_watch(void) | |
612 | { | |
613 | struct sigaction act; | |
614 | sigchld_bh = qemu_bh_new(sigchld_bh_handler, NULL); | |
615 | ||
616 | memset(&act, 0, sizeof(act)); | |
617 | act.sa_handler = sigchld_handler; | |
618 | act.sa_flags = SA_NOCLDSTOP; | |
619 | sigaction(SIGCHLD, &act, NULL); | |
620 | } | |
621 | ||
622 | int qemu_add_child_watch(pid_t pid) | |
623 | { | |
624 | ChildProcessRecord *rec; | |
625 | ||
626 | if (!sigchld_bh) { | |
627 | qemu_init_child_watch(); | |
628 | } | |
629 | ||
630 | QLIST_FOREACH(rec, &child_watches, next) { | |
631 | if (rec->pid == pid) { | |
632 | return 1; | |
633 | } | |
634 | } | |
635 | rec = g_malloc0(sizeof(ChildProcessRecord)); | |
636 | rec->pid = pid; | |
637 | QLIST_INSERT_HEAD(&child_watches, rec, next); | |
638 | return 0; | |
639 | } | |
640 | #endif |