blob: 7558eb5f5323cfb6c5b7c53d5314df941c1ff666 [file] [log] [blame]
Paolo Bonzinid3b12f52011-09-13 10:30:52 +02001/*
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 */
Paolo Bonzinid3b12f52011-09-13 10:30:52 +020024
Peter Maydelld38ea872016-01-29 17:50:05 +000025#include "qemu/osdep.h"
Markus Armbrusterda34e652016-03-14 09:01:28 +010026#include "qapi/error.h"
Veronia Bahaaf348b6d2016-03-20 19:16:19 +020027#include "qemu/cutils.h"
Paolo Bonzini1de7afc2012-12-17 18:20:00 +010028#include "qemu/timer.h"
Michael Tokarev520b6dd2013-06-12 16:31:44 +040029#include "qemu/sockets.h" // struct in_addr needed for libslirp.h
Peter Maydell01c22f22014-03-13 14:17:29 +000030#include "sysemu/qtest.h"
Paolo Bonzinid2528bd2017-03-03 12:01:16 +010031#include "sysemu/cpus.h"
Michael Tokarev520b6dd2013-06-12 16:31:44 +040032#include "slirp/libslirp.h"
Paolo Bonzini1de7afc2012-12-17 18:20:00 +010033#include "qemu/main-loop.h"
Paolo Bonzini737e1502012-12-17 18:19:44 +010034#include "block/aio.h"
Alistair Francis8297be82017-09-11 12:52:53 -070035#include "qemu/error-report.h"
Paolo Bonzinid3b12f52011-09-13 10:30:52 +020036
37#ifndef _WIN32
38
Paolo Bonzinid3b12f52011-09-13 10:30:52 +020039/* If we have signalfd, we mask out the signals we want to handle and then
40 * use signalfd to listen for them. We rely on whatever the current signal
41 * handler is to dispatch the signals when we receive them.
42 */
43static void sigfd_handler(void *opaque)
44{
45 int fd = (intptr_t)opaque;
46 struct qemu_signalfd_siginfo info;
47 struct sigaction action;
48 ssize_t len;
49
50 while (1) {
51 do {
52 len = read(fd, &info, sizeof(info));
53 } while (len == -1 && errno == EINTR);
54
55 if (len == -1 && errno == EAGAIN) {
56 break;
57 }
58
59 if (len != sizeof(info)) {
60 printf("read from sigfd returned %zd: %m\n", len);
61 return;
62 }
63
64 sigaction(info.ssi_signo, NULL, &action);
65 if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) {
Paolo Bonzinid98d4072017-02-08 13:22:12 +010066 sigaction_invoke(&action, &info);
Paolo Bonzinid3b12f52011-09-13 10:30:52 +020067 } else if (action.sa_handler) {
68 action.sa_handler(info.ssi_signo);
69 }
70 }
71}
72
73static int qemu_signal_init(void)
74{
75 int sigfd;
76 sigset_t set;
77
78 /*
79 * SIG_IPI must be blocked in the main thread and must not be caught
80 * by sigwait() in the signal thread. Otherwise, the cpu thread will
81 * not catch it reliably.
82 */
83 sigemptyset(&set);
84 sigaddset(&set, SIG_IPI);
Paolo Bonzinid3b12f52011-09-13 10:30:52 +020085 sigaddset(&set, SIGIO);
86 sigaddset(&set, SIGALRM);
87 sigaddset(&set, SIGBUS);
Jan Kiszka3e9418e2014-10-27 14:13:02 +000088 /* SIGINT cannot be handled via signalfd, so that ^C can be used
89 * to interrupt QEMU when it is being run under gdb. SIGHUP and
90 * SIGTERM are also handled asynchronously, even though it is not
91 * strictly necessary, because they use the same handler as SIGINT.
92 */
Paolo Bonzinid3b12f52011-09-13 10:30:52 +020093 pthread_sigmask(SIG_BLOCK, &set, NULL);
94
Lai Jiangshan4aa75342012-01-12 17:05:35 +080095 sigdelset(&set, SIG_IPI);
Paolo Bonzinid3b12f52011-09-13 10:30:52 +020096 sigfd = qemu_signalfd(&set);
97 if (sigfd == -1) {
98 fprintf(stderr, "failed to create signalfd\n");
99 return -errno;
100 }
101
102 fcntl_setfl(sigfd, O_NONBLOCK);
103
Fam Zheng82e1cc42015-06-04 14:45:18 +0800104 qemu_set_fd_handler(sigfd, sigfd_handler, NULL, (void *)(intptr_t)sigfd);
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200105
106 return 0;
107}
108
109#else /* _WIN32 */
110
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200111static int qemu_signal_init(void)
112{
113 return 0;
114}
115#endif
116
Paolo Bonzinif627aab2012-10-29 23:45:23 +0100117static AioContext *qemu_aio_context;
Paolo Bonziniedec47c2015-07-24 13:42:55 +0200118static QEMUBH *qemu_notify_bh;
119
120static void notify_event_cb(void *opaque)
121{
122 /* No need to do anything; this bottom half is only used to
123 * kick the kernel out of ppoll/poll/WaitForMultipleObjects.
124 */
125}
Paolo Bonzinif627aab2012-10-29 23:45:23 +0100126
Stefan Hajnoczi5f3aa1f2013-03-07 13:41:44 +0100127AioContext *qemu_get_aio_context(void)
128{
129 return qemu_aio_context;
130}
131
Paolo Bonzini4c8d0d22010-05-24 17:27:14 +0200132void qemu_notify_event(void)
133{
134 if (!qemu_aio_context) {
135 return;
136 }
Paolo Bonziniedec47c2015-07-24 13:42:55 +0200137 qemu_bh_schedule(qemu_notify_bh);
Paolo Bonzini4c8d0d22010-05-24 17:27:14 +0200138}
139
Stefan Hajnoczicbff4b32013-02-20 11:28:25 +0100140static GArray *gpollfds;
141
Chrysostomos Nanakos2f78e492014-09-18 14:30:49 +0300142int qemu_init_main_loop(Error **errp)
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200143{
144 int ret;
Paolo Bonzini82cbbdc2012-09-24 15:07:08 +0200145 GSource *src;
Chrysostomos Nanakos2f78e492014-09-18 14:30:49 +0300146 Error *local_error = NULL;
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200147
Paolo Bonzini3f53bc62017-03-03 11:50:29 +0100148 init_clocks(qemu_timer_notify_cb);
Paolo Bonzini172061a2012-10-29 15:28:36 +0100149
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200150 ret = qemu_signal_init();
151 if (ret) {
152 return ret;
153 }
154
Chrysostomos Nanakos2f78e492014-09-18 14:30:49 +0300155 qemu_aio_context = aio_context_new(&local_error);
156 if (!qemu_aio_context) {
157 error_propagate(errp, local_error);
158 return -EMFILE;
159 }
Cao jin28ba61e2016-07-06 18:08:59 +0800160 qemu_notify_bh = qemu_bh_new(notify_event_cb, NULL);
Stefan Hajnoczicbff4b32013-02-20 11:28:25 +0100161 gpollfds = g_array_new(FALSE, FALSE, sizeof(GPollFD));
Paolo Bonzini82cbbdc2012-09-24 15:07:08 +0200162 src = aio_get_g_source(qemu_aio_context);
Daniel P. Berrangec3ff7572016-09-30 15:34:24 +0100163 g_source_set_name(src, "aio-context");
Paolo Bonzini82cbbdc2012-09-24 15:07:08 +0200164 g_source_attach(src, NULL);
165 g_source_unref(src);
Fam Zhengf3926942015-09-07 11:28:58 +0800166 src = iohandler_get_g_source();
Daniel P. Berrangec3ff7572016-09-30 15:34:24 +0100167 g_source_set_name(src, "io-handler");
Fam Zhengf3926942015-09-07 11:28:58 +0800168 g_source_attach(src, NULL);
169 g_source_unref(src);
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200170 return 0;
171}
172
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200173static int max_priority;
174
Paolo Bonziniea26ce72012-03-20 10:49:21 +0100175#ifndef _WIN32
Stefan Hajnoczi48ce11f2013-02-20 11:28:26 +0100176static int glib_pollfds_idx;
177static int glib_n_poll_fds;
178
Alex Bligh7b595f32013-08-21 16:02:54 +0100179static void glib_pollfds_fill(int64_t *cur_timeout)
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200180{
181 GMainContext *context = g_main_context_default();
Paolo Bonzini4dae83a2012-03-20 10:49:17 +0100182 int timeout = 0;
Alex Bligh7b595f32013-08-21 16:02:54 +0100183 int64_t timeout_ns;
Stefan Hajnoczi48ce11f2013-02-20 11:28:26 +0100184 int n;
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200185
186 g_main_context_prepare(context, &max_priority);
187
Stefan Hajnoczi48ce11f2013-02-20 11:28:26 +0100188 glib_pollfds_idx = gpollfds->len;
189 n = glib_n_poll_fds;
190 do {
191 GPollFD *pfds;
192 glib_n_poll_fds = n;
193 g_array_set_size(gpollfds, glib_pollfds_idx + glib_n_poll_fds);
194 pfds = &g_array_index(gpollfds, GPollFD, glib_pollfds_idx);
195 n = g_main_context_query(context, max_priority, &timeout, pfds,
196 glib_n_poll_fds);
197 } while (n != glib_n_poll_fds);
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200198
Alex Bligh7b595f32013-08-21 16:02:54 +0100199 if (timeout < 0) {
200 timeout_ns = -1;
201 } else {
202 timeout_ns = (int64_t)timeout * (int64_t)SCALE_MS;
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200203 }
Alex Bligh7b595f32013-08-21 16:02:54 +0100204
205 *cur_timeout = qemu_soonest_timeout(timeout_ns, *cur_timeout);
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200206}
207
Stefan Hajnoczi48ce11f2013-02-20 11:28:26 +0100208static void glib_pollfds_poll(void)
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200209{
210 GMainContext *context = g_main_context_default();
Stefan Hajnoczi48ce11f2013-02-20 11:28:26 +0100211 GPollFD *pfds = &g_array_index(gpollfds, GPollFD, glib_pollfds_idx);
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200212
Stefan Hajnoczi48ce11f2013-02-20 11:28:26 +0100213 if (g_main_context_check(context, max_priority, pfds, glib_n_poll_fds)) {
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200214 g_main_context_dispatch(context);
215 }
216}
217
Anthony Liguori893986f2013-04-05 08:46:00 -0500218#define MAX_MAIN_LOOP_SPIN (1000)
219
Alex Bligh7b595f32013-08-21 16:02:54 +0100220static int os_host_main_loop_wait(int64_t timeout)
Paolo Bonzini15455532012-03-20 10:49:18 +0100221{
Richard W.M. Jonesecbddbb2017-03-31 21:51:33 +0100222 GMainContext *context = g_main_context_default();
Paolo Bonzini15455532012-03-20 10:49:18 +0100223 int ret;
Anthony Liguori893986f2013-04-05 08:46:00 -0500224 static int spin_counter;
Paolo Bonzini15455532012-03-20 10:49:18 +0100225
Richard W.M. Jonesecbddbb2017-03-31 21:51:33 +0100226 g_main_context_acquire(context);
227
Stefan Hajnoczi48ce11f2013-02-20 11:28:26 +0100228 glib_pollfds_fill(&timeout);
Paolo Bonzini15455532012-03-20 10:49:18 +0100229
Anthony Liguori893986f2013-04-05 08:46:00 -0500230 /* If the I/O thread is very busy or we are incorrectly busy waiting in
231 * the I/O thread, this can lead to starvation of the BQL such that the
232 * VCPU threads never run. To make sure we can detect the later case,
233 * print a message to the screen. If we run into this condition, create
234 * a fake timeout in order to give the VCPU threads a chance to run.
235 */
Alex Bligh7b595f32013-08-21 16:02:54 +0100236 if (!timeout && (spin_counter > MAX_MAIN_LOOP_SPIN)) {
Anthony Liguori893986f2013-04-05 08:46:00 -0500237 static bool notified;
238
Max Reitz7d175d22016-10-17 20:09:39 +0200239 if (!notified && !qtest_enabled() && !qtest_driver()) {
Alistair Francis8297be82017-09-11 12:52:53 -0700240 warn_report("I/O thread spun for %d iterations",
241 MAX_MAIN_LOOP_SPIN);
Anthony Liguori893986f2013-04-05 08:46:00 -0500242 notified = true;
243 }
244
Alex Bligh7b595f32013-08-21 16:02:54 +0100245 timeout = SCALE_MS;
Anthony Liguori893986f2013-04-05 08:46:00 -0500246 }
247
Alex Bligh7b595f32013-08-21 16:02:54 +0100248 if (timeout) {
Anthony Liguori893986f2013-04-05 08:46:00 -0500249 spin_counter = 0;
Paolo Bonzini15455532012-03-20 10:49:18 +0100250 qemu_mutex_unlock_iothread();
Anthony Liguori893986f2013-04-05 08:46:00 -0500251 } else {
252 spin_counter++;
Paolo Bonzini15455532012-03-20 10:49:18 +0100253 }
254
Alex Bligh7b595f32013-08-21 16:02:54 +0100255 ret = qemu_poll_ns((GPollFD *)gpollfds->data, gpollfds->len, timeout);
Stefan Hajnoczicbff4b32013-02-20 11:28:25 +0100256
Alex Bligh7b595f32013-08-21 16:02:54 +0100257 if (timeout) {
Paolo Bonzini15455532012-03-20 10:49:18 +0100258 qemu_mutex_lock_iothread();
259 }
260
Stefan Hajnoczi48ce11f2013-02-20 11:28:26 +0100261 glib_pollfds_poll();
Richard W.M. Jonesecbddbb2017-03-31 21:51:33 +0100262
263 g_main_context_release(context);
264
Paolo Bonzini15455532012-03-20 10:49:18 +0100265 return ret;
266}
267#else
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200268/***********************************************************/
269/* Polling handling */
270
271typedef struct PollingEntry {
272 PollingFunc *func;
273 void *opaque;
274 struct PollingEntry *next;
275} PollingEntry;
276
277static PollingEntry *first_polling_entry;
278
279int qemu_add_polling_cb(PollingFunc *func, void *opaque)
280{
281 PollingEntry **ppe, *pe;
282 pe = g_malloc0(sizeof(PollingEntry));
283 pe->func = func;
284 pe->opaque = opaque;
285 for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next);
286 *ppe = pe;
287 return 0;
288}
289
290void qemu_del_polling_cb(PollingFunc *func, void *opaque)
291{
292 PollingEntry **ppe, *pe;
293 for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next) {
294 pe = *ppe;
295 if (pe->func == func && pe->opaque == opaque) {
296 *ppe = pe->next;
297 g_free(pe);
298 break;
299 }
300 }
301}
302
303/***********************************************************/
304/* Wait objects support */
305typedef struct WaitObjects {
306 int num;
Paolo Bonzini06ac7d42012-03-20 10:49:20 +0100307 int revents[MAXIMUM_WAIT_OBJECTS + 1];
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200308 HANDLE events[MAXIMUM_WAIT_OBJECTS + 1];
309 WaitObjectFunc *func[MAXIMUM_WAIT_OBJECTS + 1];
310 void *opaque[MAXIMUM_WAIT_OBJECTS + 1];
311} WaitObjects;
312
313static WaitObjects wait_objects = {0};
314
315int qemu_add_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque)
316{
317 WaitObjects *w = &wait_objects;
318 if (w->num >= MAXIMUM_WAIT_OBJECTS) {
319 return -1;
320 }
321 w->events[w->num] = handle;
322 w->func[w->num] = func;
323 w->opaque[w->num] = opaque;
Paolo Bonzini06ac7d42012-03-20 10:49:20 +0100324 w->revents[w->num] = 0;
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200325 w->num++;
326 return 0;
327}
328
329void qemu_del_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque)
330{
331 int i, found;
332 WaitObjects *w = &wait_objects;
333
334 found = 0;
335 for (i = 0; i < w->num; i++) {
336 if (w->events[i] == handle) {
337 found = 1;
338 }
339 if (found) {
340 w->events[i] = w->events[i + 1];
341 w->func[i] = w->func[i + 1];
342 w->opaque[i] = w->opaque[i + 1];
Paolo Bonzini06ac7d42012-03-20 10:49:20 +0100343 w->revents[i] = w->revents[i + 1];
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200344 }
345 }
346 if (found) {
347 w->num--;
348 }
349}
350
Paolo Bonzinid3385eb2012-03-20 10:49:19 +0100351void qemu_fd_register(int fd)
352{
Paolo Bonzini4c8d0d22010-05-24 17:27:14 +0200353 WSAEventSelect(fd, event_notifier_get_handle(&qemu_aio_context->notifier),
354 FD_READ | FD_ACCEPT | FD_CLOSE |
Paolo Bonzinid3385eb2012-03-20 10:49:19 +0100355 FD_CONNECT | FD_WRITE | FD_OOB);
356}
357
Stefan Hajnoczicbff4b32013-02-20 11:28:25 +0100358static int pollfds_fill(GArray *pollfds, fd_set *rfds, fd_set *wfds,
359 fd_set *xfds)
360{
361 int nfds = -1;
362 int i;
363
364 for (i = 0; i < pollfds->len; i++) {
365 GPollFD *pfd = &g_array_index(pollfds, GPollFD, i);
366 int fd = pfd->fd;
367 int events = pfd->events;
Stefan Hajnoczi8db165b2013-05-16 17:36:00 +0200368 if (events & G_IO_IN) {
Stefan Hajnoczicbff4b32013-02-20 11:28:25 +0100369 FD_SET(fd, rfds);
370 nfds = MAX(nfds, fd);
371 }
Stefan Hajnoczi8db165b2013-05-16 17:36:00 +0200372 if (events & G_IO_OUT) {
Stefan Hajnoczicbff4b32013-02-20 11:28:25 +0100373 FD_SET(fd, wfds);
374 nfds = MAX(nfds, fd);
375 }
376 if (events & G_IO_PRI) {
377 FD_SET(fd, xfds);
378 nfds = MAX(nfds, fd);
379 }
380 }
381 return nfds;
382}
383
384static void pollfds_poll(GArray *pollfds, int nfds, fd_set *rfds,
385 fd_set *wfds, fd_set *xfds)
386{
387 int i;
388
389 for (i = 0; i < pollfds->len; i++) {
390 GPollFD *pfd = &g_array_index(pollfds, GPollFD, i);
391 int fd = pfd->fd;
392 int revents = 0;
393
394 if (FD_ISSET(fd, rfds)) {
Stefan Hajnoczi8db165b2013-05-16 17:36:00 +0200395 revents |= G_IO_IN;
Stefan Hajnoczicbff4b32013-02-20 11:28:25 +0100396 }
397 if (FD_ISSET(fd, wfds)) {
Stefan Hajnoczi8db165b2013-05-16 17:36:00 +0200398 revents |= G_IO_OUT;
Stefan Hajnoczicbff4b32013-02-20 11:28:25 +0100399 }
400 if (FD_ISSET(fd, xfds)) {
401 revents |= G_IO_PRI;
402 }
403 pfd->revents = revents & pfd->events;
404 }
405}
406
Alex Bligh7b595f32013-08-21 16:02:54 +0100407static int os_host_main_loop_wait(int64_t timeout)
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200408{
Paolo Bonziniea26ce72012-03-20 10:49:21 +0100409 GMainContext *context = g_main_context_default();
Stefan Hajnoczi48ce11f2013-02-20 11:28:26 +0100410 GPollFD poll_fds[1024 * 2]; /* this is probably overkill */
Stefan Hajnoczi134a03e2013-02-20 11:28:24 +0100411 int select_ret = 0;
Stefan Hajnoczi48ce11f2013-02-20 11:28:26 +0100412 int g_poll_ret, ret, i, n_poll_fds;
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200413 PollingEntry *pe;
Paolo Bonzinid3385eb2012-03-20 10:49:19 +0100414 WaitObjects *w = &wait_objects;
Stefan Weil42fe1c22012-04-27 17:02:08 +0200415 gint poll_timeout;
Alex Bligh7b595f32013-08-21 16:02:54 +0100416 int64_t poll_timeout_ns;
Paolo Bonzini15455532012-03-20 10:49:18 +0100417 static struct timeval tv0;
Stefan Hajnoczi9cbaacf2013-02-20 11:28:30 +0100418 fd_set rfds, wfds, xfds;
419 int nfds;
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200420
Richard W.M. Jonesecbddbb2017-03-31 21:51:33 +0100421 g_main_context_acquire(context);
422
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200423 /* XXX: need to suppress polling by better using win32 events */
424 ret = 0;
425 for (pe = first_polling_entry; pe != NULL; pe = pe->next) {
426 ret |= pe->func(pe->opaque);
427 }
Paolo Bonzinid3385eb2012-03-20 10:49:19 +0100428 if (ret != 0) {
Richard W.M. Jonesecbddbb2017-03-31 21:51:33 +0100429 g_main_context_release(context);
Paolo Bonzinid3385eb2012-03-20 10:49:19 +0100430 return ret;
431 }
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200432
Stefan Hajnoczi3cb8c202013-05-16 17:36:01 +0200433 FD_ZERO(&rfds);
434 FD_ZERO(&wfds);
435 FD_ZERO(&xfds);
436 nfds = pollfds_fill(gpollfds, &rfds, &wfds, &xfds);
437 if (nfds >= 0) {
438 select_ret = select(nfds + 1, &rfds, &wfds, &xfds, &tv0);
439 if (select_ret != 0) {
440 timeout = 0;
441 }
442 if (select_ret > 0) {
443 pollfds_poll(gpollfds, nfds, &rfds, &wfds, &xfds);
444 }
445 }
446
Paolo Bonziniea26ce72012-03-20 10:49:21 +0100447 g_main_context_prepare(context, &max_priority);
Stefan Weil42fe1c22012-04-27 17:02:08 +0200448 n_poll_fds = g_main_context_query(context, max_priority, &poll_timeout,
Paolo Bonziniea26ce72012-03-20 10:49:21 +0100449 poll_fds, ARRAY_SIZE(poll_fds));
450 g_assert(n_poll_fds <= ARRAY_SIZE(poll_fds));
451
Paolo Bonzini06ac7d42012-03-20 10:49:20 +0100452 for (i = 0; i < w->num; i++) {
Stefan Weil58b96302012-04-12 20:42:34 +0200453 poll_fds[n_poll_fds + i].fd = (DWORD_PTR)w->events[i];
Paolo Bonziniea26ce72012-03-20 10:49:21 +0100454 poll_fds[n_poll_fds + i].events = G_IO_IN;
Paolo Bonzinid3385eb2012-03-20 10:49:19 +0100455 }
456
Alex Bligh7b595f32013-08-21 16:02:54 +0100457 if (poll_timeout < 0) {
458 poll_timeout_ns = -1;
459 } else {
460 poll_timeout_ns = (int64_t)poll_timeout * (int64_t)SCALE_MS;
Stefan Weil3239ad02012-04-29 19:15:02 +0200461 }
462
Alex Bligh7b595f32013-08-21 16:02:54 +0100463 poll_timeout_ns = qemu_soonest_timeout(poll_timeout_ns, timeout);
464
Paolo Bonzini06ac7d42012-03-20 10:49:20 +0100465 qemu_mutex_unlock_iothread();
Alex Bligh7b595f32013-08-21 16:02:54 +0100466 g_poll_ret = qemu_poll_ns(poll_fds, n_poll_fds + w->num, poll_timeout_ns);
467
Paolo Bonzini06ac7d42012-03-20 10:49:20 +0100468 qemu_mutex_lock_iothread();
Fabien Chouteau5e3bc732013-01-08 16:30:56 +0100469 if (g_poll_ret > 0) {
Paolo Bonzini06ac7d42012-03-20 10:49:20 +0100470 for (i = 0; i < w->num; i++) {
Paolo Bonziniea26ce72012-03-20 10:49:21 +0100471 w->revents[i] = poll_fds[n_poll_fds + i].revents;
Paolo Bonzini06ac7d42012-03-20 10:49:20 +0100472 }
473 for (i = 0; i < w->num; i++) {
474 if (w->revents[i] && w->func[i]) {
475 w->func[i](w->opaque[i]);
476 }
477 }
478 }
Paolo Bonzinid3385eb2012-03-20 10:49:19 +0100479
Paolo Bonziniea26ce72012-03-20 10:49:21 +0100480 if (g_main_context_check(context, max_priority, poll_fds, n_poll_fds)) {
481 g_main_context_dispatch(context);
482 }
483
Richard W.M. Jonesecbddbb2017-03-31 21:51:33 +0100484 g_main_context_release(context);
485
Fabien Chouteau5e3bc732013-01-08 16:30:56 +0100486 return select_ret || g_poll_ret;
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200487}
488#endif
489
Peter Maydellde5f8522017-06-27 18:32:49 +0100490void main_loop_wait(int nonblocking)
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200491{
Stefano Stabellini7c7db752012-04-13 19:35:04 +0100492 int ret;
493 uint32_t timeout = UINT32_MAX;
Alex Bligh7b595f32013-08-21 16:02:54 +0100494 int64_t timeout_ns;
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200495
496 if (nonblocking) {
497 timeout = 0;
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200498 }
499
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200500 /* poll any events */
Stefan Hajnoczicbff4b32013-02-20 11:28:25 +0100501 g_array_set_size(gpollfds, 0); /* reset for new iteration */
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200502 /* XXX: separate device handlers from system ones */
Liu Ping Fana42e9c42013-08-25 10:01:21 +0800503 slirp_pollfds_fill(gpollfds, &timeout);
Alex Bligh7b595f32013-08-21 16:02:54 +0100504
505 if (timeout == UINT32_MAX) {
506 timeout_ns = -1;
507 } else {
508 timeout_ns = (uint64_t)timeout * (int64_t)(SCALE_MS);
509 }
510
511 timeout_ns = qemu_soonest_timeout(timeout_ns,
512 timerlistgroup_deadline_ns(
513 &main_loop_tlg));
514
515 ret = os_host_main_loop_wait(timeout_ns);
Stefan Hajnoczi8917c3b2013-02-20 11:28:28 +0100516 slirp_pollfds_poll(gpollfds, (ret < 0));
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200517
Pavel Dovgalyukefab87c2015-09-17 19:24:39 +0300518 /* CPU thread can infinitely wait for event after
519 missing the warp */
Pavel Dovgalyuke76d1792016-03-10 14:56:09 +0300520 qemu_start_warp_timer();
Alex Bligh40daca52013-08-21 16:03:02 +0100521 qemu_clock_run_all_timers();
Paolo Bonzinid3b12f52011-09-13 10:30:52 +0200522}
Paolo Bonzinif627aab2012-10-29 23:45:23 +0100523
524/* Functions to operate on the main QEMU AioContext. */
525
526QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque)
527{
528 return aio_bh_new(qemu_aio_context, cb, opaque);
529}