Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 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 | */ |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 24 | |
Stefan Weil | 0ec024f | 2011-10-25 22:23:17 +0200 | [diff] [blame] | 25 | #include "qemu-common.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 26 | #include "qemu/timer.h" |
Michael Tokarev | 520b6dd | 2013-06-12 16:31:44 +0400 | [diff] [blame] | 27 | #include "qemu/sockets.h" // struct in_addr needed for libslirp.h |
Peter Maydell | 01c22f2 | 2014-03-13 14:17:29 +0000 | [diff] [blame] | 28 | #include "sysemu/qtest.h" |
Michael Tokarev | 520b6dd | 2013-06-12 16:31:44 +0400 | [diff] [blame] | 29 | #include "slirp/libslirp.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 30 | #include "qemu/main-loop.h" |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 31 | #include "block/aio.h" |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 32 | |
| 33 | #ifndef _WIN32 |
| 34 | |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 35 | #include "qemu/compatfd.h" |
Stefan Weil | 0ec024f | 2011-10-25 22:23:17 +0200 | [diff] [blame] | 36 | |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 37 | /* If we have signalfd, we mask out the signals we want to handle and then |
| 38 | * use signalfd to listen for them. We rely on whatever the current signal |
| 39 | * handler is to dispatch the signals when we receive them. |
| 40 | */ |
| 41 | static void sigfd_handler(void *opaque) |
| 42 | { |
| 43 | int fd = (intptr_t)opaque; |
| 44 | struct qemu_signalfd_siginfo info; |
| 45 | struct sigaction action; |
| 46 | ssize_t len; |
| 47 | |
| 48 | while (1) { |
| 49 | do { |
| 50 | len = read(fd, &info, sizeof(info)); |
| 51 | } while (len == -1 && errno == EINTR); |
| 52 | |
| 53 | if (len == -1 && errno == EAGAIN) { |
| 54 | break; |
| 55 | } |
| 56 | |
| 57 | if (len != sizeof(info)) { |
| 58 | printf("read from sigfd returned %zd: %m\n", len); |
| 59 | return; |
| 60 | } |
| 61 | |
| 62 | sigaction(info.ssi_signo, NULL, &action); |
| 63 | if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) { |
| 64 | action.sa_sigaction(info.ssi_signo, |
| 65 | (siginfo_t *)&info, NULL); |
| 66 | } else if (action.sa_handler) { |
| 67 | action.sa_handler(info.ssi_signo); |
| 68 | } |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | static int qemu_signal_init(void) |
| 73 | { |
| 74 | int sigfd; |
| 75 | sigset_t set; |
| 76 | |
| 77 | /* |
| 78 | * SIG_IPI must be blocked in the main thread and must not be caught |
| 79 | * by sigwait() in the signal thread. Otherwise, the cpu thread will |
| 80 | * not catch it reliably. |
| 81 | */ |
| 82 | sigemptyset(&set); |
| 83 | sigaddset(&set, SIG_IPI); |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 84 | sigaddset(&set, SIGIO); |
| 85 | sigaddset(&set, SIGALRM); |
| 86 | sigaddset(&set, SIGBUS); |
Jan Kiszka | 3e9418e | 2014-10-27 14:13:02 +0000 | [diff] [blame] | 87 | /* SIGINT cannot be handled via signalfd, so that ^C can be used |
| 88 | * to interrupt QEMU when it is being run under gdb. SIGHUP and |
| 89 | * SIGTERM are also handled asynchronously, even though it is not |
| 90 | * strictly necessary, because they use the same handler as SIGINT. |
| 91 | */ |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 92 | pthread_sigmask(SIG_BLOCK, &set, NULL); |
| 93 | |
Lai Jiangshan | 4aa7534 | 2012-01-12 17:05:35 +0800 | [diff] [blame] | 94 | sigdelset(&set, SIG_IPI); |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 95 | sigfd = qemu_signalfd(&set); |
| 96 | if (sigfd == -1) { |
| 97 | fprintf(stderr, "failed to create signalfd\n"); |
| 98 | return -errno; |
| 99 | } |
| 100 | |
| 101 | fcntl_setfl(sigfd, O_NONBLOCK); |
| 102 | |
| 103 | qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL, |
| 104 | (void *)(intptr_t)sigfd); |
| 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | #else /* _WIN32 */ |
| 110 | |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 111 | static int qemu_signal_init(void) |
| 112 | { |
| 113 | return 0; |
| 114 | } |
| 115 | #endif |
| 116 | |
Paolo Bonzini | f627aab | 2012-10-29 23:45:23 +0100 | [diff] [blame] | 117 | static AioContext *qemu_aio_context; |
| 118 | |
Stefan Hajnoczi | 5f3aa1f | 2013-03-07 13:41:44 +0100 | [diff] [blame] | 119 | AioContext *qemu_get_aio_context(void) |
| 120 | { |
| 121 | return qemu_aio_context; |
| 122 | } |
| 123 | |
Paolo Bonzini | 4c8d0d2 | 2010-05-24 17:27:14 +0200 | [diff] [blame] | 124 | void qemu_notify_event(void) |
| 125 | { |
| 126 | if (!qemu_aio_context) { |
| 127 | return; |
| 128 | } |
| 129 | aio_notify(qemu_aio_context); |
| 130 | } |
| 131 | |
Stefan Hajnoczi | cbff4b3 | 2013-02-20 11:28:25 +0100 | [diff] [blame] | 132 | static GArray *gpollfds; |
| 133 | |
Chrysostomos Nanakos | 2f78e49 | 2014-09-18 14:30:49 +0300 | [diff] [blame] | 134 | int qemu_init_main_loop(Error **errp) |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 135 | { |
| 136 | int ret; |
Paolo Bonzini | 82cbbdc | 2012-09-24 15:07:08 +0200 | [diff] [blame] | 137 | GSource *src; |
Chrysostomos Nanakos | 2f78e49 | 2014-09-18 14:30:49 +0300 | [diff] [blame] | 138 | Error *local_error = NULL; |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 139 | |
Paolo Bonzini | 172061a | 2012-10-29 15:28:36 +0100 | [diff] [blame] | 140 | init_clocks(); |
Paolo Bonzini | 172061a | 2012-10-29 15:28:36 +0100 | [diff] [blame] | 141 | |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 142 | ret = qemu_signal_init(); |
| 143 | if (ret) { |
| 144 | return ret; |
| 145 | } |
| 146 | |
Chrysostomos Nanakos | 2f78e49 | 2014-09-18 14:30:49 +0300 | [diff] [blame] | 147 | qemu_aio_context = aio_context_new(&local_error); |
| 148 | if (!qemu_aio_context) { |
| 149 | error_propagate(errp, local_error); |
| 150 | return -EMFILE; |
| 151 | } |
Stefan Hajnoczi | cbff4b3 | 2013-02-20 11:28:25 +0100 | [diff] [blame] | 152 | gpollfds = g_array_new(FALSE, FALSE, sizeof(GPollFD)); |
Paolo Bonzini | 82cbbdc | 2012-09-24 15:07:08 +0200 | [diff] [blame] | 153 | src = aio_get_g_source(qemu_aio_context); |
| 154 | g_source_attach(src, NULL); |
| 155 | g_source_unref(src); |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 156 | return 0; |
| 157 | } |
| 158 | |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 159 | static int max_priority; |
| 160 | |
Paolo Bonzini | ea26ce7 | 2012-03-20 10:49:21 +0100 | [diff] [blame] | 161 | #ifndef _WIN32 |
Stefan Hajnoczi | 48ce11f | 2013-02-20 11:28:26 +0100 | [diff] [blame] | 162 | static int glib_pollfds_idx; |
| 163 | static int glib_n_poll_fds; |
| 164 | |
Alex Bligh | 7b595f3 | 2013-08-21 16:02:54 +0100 | [diff] [blame] | 165 | static void glib_pollfds_fill(int64_t *cur_timeout) |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 166 | { |
| 167 | GMainContext *context = g_main_context_default(); |
Paolo Bonzini | 4dae83a | 2012-03-20 10:49:17 +0100 | [diff] [blame] | 168 | int timeout = 0; |
Alex Bligh | 7b595f3 | 2013-08-21 16:02:54 +0100 | [diff] [blame] | 169 | int64_t timeout_ns; |
Stefan Hajnoczi | 48ce11f | 2013-02-20 11:28:26 +0100 | [diff] [blame] | 170 | int n; |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 171 | |
| 172 | g_main_context_prepare(context, &max_priority); |
| 173 | |
Stefan Hajnoczi | 48ce11f | 2013-02-20 11:28:26 +0100 | [diff] [blame] | 174 | glib_pollfds_idx = gpollfds->len; |
| 175 | n = glib_n_poll_fds; |
| 176 | do { |
| 177 | GPollFD *pfds; |
| 178 | glib_n_poll_fds = n; |
| 179 | g_array_set_size(gpollfds, glib_pollfds_idx + glib_n_poll_fds); |
| 180 | pfds = &g_array_index(gpollfds, GPollFD, glib_pollfds_idx); |
| 181 | n = g_main_context_query(context, max_priority, &timeout, pfds, |
| 182 | glib_n_poll_fds); |
| 183 | } while (n != glib_n_poll_fds); |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 184 | |
Alex Bligh | 7b595f3 | 2013-08-21 16:02:54 +0100 | [diff] [blame] | 185 | if (timeout < 0) { |
| 186 | timeout_ns = -1; |
| 187 | } else { |
| 188 | timeout_ns = (int64_t)timeout * (int64_t)SCALE_MS; |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 189 | } |
Alex Bligh | 7b595f3 | 2013-08-21 16:02:54 +0100 | [diff] [blame] | 190 | |
| 191 | *cur_timeout = qemu_soonest_timeout(timeout_ns, *cur_timeout); |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 192 | } |
| 193 | |
Stefan Hajnoczi | 48ce11f | 2013-02-20 11:28:26 +0100 | [diff] [blame] | 194 | static void glib_pollfds_poll(void) |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 195 | { |
| 196 | GMainContext *context = g_main_context_default(); |
Stefan Hajnoczi | 48ce11f | 2013-02-20 11:28:26 +0100 | [diff] [blame] | 197 | GPollFD *pfds = &g_array_index(gpollfds, GPollFD, glib_pollfds_idx); |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 198 | |
Stefan Hajnoczi | 48ce11f | 2013-02-20 11:28:26 +0100 | [diff] [blame] | 199 | if (g_main_context_check(context, max_priority, pfds, glib_n_poll_fds)) { |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 200 | g_main_context_dispatch(context); |
| 201 | } |
| 202 | } |
| 203 | |
Anthony Liguori | 893986f | 2013-04-05 08:46:00 -0500 | [diff] [blame] | 204 | #define MAX_MAIN_LOOP_SPIN (1000) |
| 205 | |
Alex Bligh | 7b595f3 | 2013-08-21 16:02:54 +0100 | [diff] [blame] | 206 | static int os_host_main_loop_wait(int64_t timeout) |
Paolo Bonzini | 1545553 | 2012-03-20 10:49:18 +0100 | [diff] [blame] | 207 | { |
Paolo Bonzini | 1545553 | 2012-03-20 10:49:18 +0100 | [diff] [blame] | 208 | int ret; |
Anthony Liguori | 893986f | 2013-04-05 08:46:00 -0500 | [diff] [blame] | 209 | static int spin_counter; |
Paolo Bonzini | 1545553 | 2012-03-20 10:49:18 +0100 | [diff] [blame] | 210 | |
Stefan Hajnoczi | 48ce11f | 2013-02-20 11:28:26 +0100 | [diff] [blame] | 211 | glib_pollfds_fill(&timeout); |
Paolo Bonzini | 1545553 | 2012-03-20 10:49:18 +0100 | [diff] [blame] | 212 | |
Anthony Liguori | 893986f | 2013-04-05 08:46:00 -0500 | [diff] [blame] | 213 | /* If the I/O thread is very busy or we are incorrectly busy waiting in |
| 214 | * the I/O thread, this can lead to starvation of the BQL such that the |
| 215 | * VCPU threads never run. To make sure we can detect the later case, |
| 216 | * print a message to the screen. If we run into this condition, create |
| 217 | * a fake timeout in order to give the VCPU threads a chance to run. |
| 218 | */ |
Alex Bligh | 7b595f3 | 2013-08-21 16:02:54 +0100 | [diff] [blame] | 219 | if (!timeout && (spin_counter > MAX_MAIN_LOOP_SPIN)) { |
Anthony Liguori | 893986f | 2013-04-05 08:46:00 -0500 | [diff] [blame] | 220 | static bool notified; |
| 221 | |
Peter Maydell | 01c22f2 | 2014-03-13 14:17:29 +0000 | [diff] [blame] | 222 | if (!notified && !qtest_enabled()) { |
Anthony Liguori | 893986f | 2013-04-05 08:46:00 -0500 | [diff] [blame] | 223 | fprintf(stderr, |
| 224 | "main-loop: WARNING: I/O thread spun for %d iterations\n", |
| 225 | MAX_MAIN_LOOP_SPIN); |
| 226 | notified = true; |
| 227 | } |
| 228 | |
Alex Bligh | 7b595f3 | 2013-08-21 16:02:54 +0100 | [diff] [blame] | 229 | timeout = SCALE_MS; |
Anthony Liguori | 893986f | 2013-04-05 08:46:00 -0500 | [diff] [blame] | 230 | } |
| 231 | |
Alex Bligh | 7b595f3 | 2013-08-21 16:02:54 +0100 | [diff] [blame] | 232 | if (timeout) { |
Anthony Liguori | 893986f | 2013-04-05 08:46:00 -0500 | [diff] [blame] | 233 | spin_counter = 0; |
Paolo Bonzini | 1545553 | 2012-03-20 10:49:18 +0100 | [diff] [blame] | 234 | qemu_mutex_unlock_iothread(); |
Anthony Liguori | 893986f | 2013-04-05 08:46:00 -0500 | [diff] [blame] | 235 | } else { |
| 236 | spin_counter++; |
Paolo Bonzini | 1545553 | 2012-03-20 10:49:18 +0100 | [diff] [blame] | 237 | } |
| 238 | |
Alex Bligh | 7b595f3 | 2013-08-21 16:02:54 +0100 | [diff] [blame] | 239 | ret = qemu_poll_ns((GPollFD *)gpollfds->data, gpollfds->len, timeout); |
Stefan Hajnoczi | cbff4b3 | 2013-02-20 11:28:25 +0100 | [diff] [blame] | 240 | |
Alex Bligh | 7b595f3 | 2013-08-21 16:02:54 +0100 | [diff] [blame] | 241 | if (timeout) { |
Paolo Bonzini | 1545553 | 2012-03-20 10:49:18 +0100 | [diff] [blame] | 242 | qemu_mutex_lock_iothread(); |
| 243 | } |
| 244 | |
Stefan Hajnoczi | 48ce11f | 2013-02-20 11:28:26 +0100 | [diff] [blame] | 245 | glib_pollfds_poll(); |
Paolo Bonzini | 1545553 | 2012-03-20 10:49:18 +0100 | [diff] [blame] | 246 | return ret; |
| 247 | } |
| 248 | #else |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 249 | /***********************************************************/ |
| 250 | /* Polling handling */ |
| 251 | |
| 252 | typedef struct PollingEntry { |
| 253 | PollingFunc *func; |
| 254 | void *opaque; |
| 255 | struct PollingEntry *next; |
| 256 | } PollingEntry; |
| 257 | |
| 258 | static PollingEntry *first_polling_entry; |
| 259 | |
| 260 | int qemu_add_polling_cb(PollingFunc *func, void *opaque) |
| 261 | { |
| 262 | PollingEntry **ppe, *pe; |
| 263 | pe = g_malloc0(sizeof(PollingEntry)); |
| 264 | pe->func = func; |
| 265 | pe->opaque = opaque; |
| 266 | for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next); |
| 267 | *ppe = pe; |
| 268 | return 0; |
| 269 | } |
| 270 | |
| 271 | void qemu_del_polling_cb(PollingFunc *func, void *opaque) |
| 272 | { |
| 273 | PollingEntry **ppe, *pe; |
| 274 | for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next) { |
| 275 | pe = *ppe; |
| 276 | if (pe->func == func && pe->opaque == opaque) { |
| 277 | *ppe = pe->next; |
| 278 | g_free(pe); |
| 279 | break; |
| 280 | } |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | /***********************************************************/ |
| 285 | /* Wait objects support */ |
| 286 | typedef struct WaitObjects { |
| 287 | int num; |
Paolo Bonzini | 06ac7d4 | 2012-03-20 10:49:20 +0100 | [diff] [blame] | 288 | int revents[MAXIMUM_WAIT_OBJECTS + 1]; |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 289 | HANDLE events[MAXIMUM_WAIT_OBJECTS + 1]; |
| 290 | WaitObjectFunc *func[MAXIMUM_WAIT_OBJECTS + 1]; |
| 291 | void *opaque[MAXIMUM_WAIT_OBJECTS + 1]; |
| 292 | } WaitObjects; |
| 293 | |
| 294 | static WaitObjects wait_objects = {0}; |
| 295 | |
| 296 | int qemu_add_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque) |
| 297 | { |
| 298 | WaitObjects *w = &wait_objects; |
| 299 | if (w->num >= MAXIMUM_WAIT_OBJECTS) { |
| 300 | return -1; |
| 301 | } |
| 302 | w->events[w->num] = handle; |
| 303 | w->func[w->num] = func; |
| 304 | w->opaque[w->num] = opaque; |
Paolo Bonzini | 06ac7d4 | 2012-03-20 10:49:20 +0100 | [diff] [blame] | 305 | w->revents[w->num] = 0; |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 306 | w->num++; |
| 307 | return 0; |
| 308 | } |
| 309 | |
| 310 | void qemu_del_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque) |
| 311 | { |
| 312 | int i, found; |
| 313 | WaitObjects *w = &wait_objects; |
| 314 | |
| 315 | found = 0; |
| 316 | for (i = 0; i < w->num; i++) { |
| 317 | if (w->events[i] == handle) { |
| 318 | found = 1; |
| 319 | } |
| 320 | if (found) { |
| 321 | w->events[i] = w->events[i + 1]; |
| 322 | w->func[i] = w->func[i + 1]; |
| 323 | w->opaque[i] = w->opaque[i + 1]; |
Paolo Bonzini | 06ac7d4 | 2012-03-20 10:49:20 +0100 | [diff] [blame] | 324 | w->revents[i] = w->revents[i + 1]; |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 325 | } |
| 326 | } |
| 327 | if (found) { |
| 328 | w->num--; |
| 329 | } |
| 330 | } |
| 331 | |
Paolo Bonzini | d3385eb | 2012-03-20 10:49:19 +0100 | [diff] [blame] | 332 | void qemu_fd_register(int fd) |
| 333 | { |
Paolo Bonzini | 4c8d0d2 | 2010-05-24 17:27:14 +0200 | [diff] [blame] | 334 | WSAEventSelect(fd, event_notifier_get_handle(&qemu_aio_context->notifier), |
| 335 | FD_READ | FD_ACCEPT | FD_CLOSE | |
Paolo Bonzini | d3385eb | 2012-03-20 10:49:19 +0100 | [diff] [blame] | 336 | FD_CONNECT | FD_WRITE | FD_OOB); |
| 337 | } |
| 338 | |
Stefan Hajnoczi | cbff4b3 | 2013-02-20 11:28:25 +0100 | [diff] [blame] | 339 | static int pollfds_fill(GArray *pollfds, fd_set *rfds, fd_set *wfds, |
| 340 | fd_set *xfds) |
| 341 | { |
| 342 | int nfds = -1; |
| 343 | int i; |
| 344 | |
| 345 | for (i = 0; i < pollfds->len; i++) { |
| 346 | GPollFD *pfd = &g_array_index(pollfds, GPollFD, i); |
| 347 | int fd = pfd->fd; |
| 348 | int events = pfd->events; |
Stefan Hajnoczi | 8db165b | 2013-05-16 17:36:00 +0200 | [diff] [blame] | 349 | if (events & G_IO_IN) { |
Stefan Hajnoczi | cbff4b3 | 2013-02-20 11:28:25 +0100 | [diff] [blame] | 350 | FD_SET(fd, rfds); |
| 351 | nfds = MAX(nfds, fd); |
| 352 | } |
Stefan Hajnoczi | 8db165b | 2013-05-16 17:36:00 +0200 | [diff] [blame] | 353 | if (events & G_IO_OUT) { |
Stefan Hajnoczi | cbff4b3 | 2013-02-20 11:28:25 +0100 | [diff] [blame] | 354 | FD_SET(fd, wfds); |
| 355 | nfds = MAX(nfds, fd); |
| 356 | } |
| 357 | if (events & G_IO_PRI) { |
| 358 | FD_SET(fd, xfds); |
| 359 | nfds = MAX(nfds, fd); |
| 360 | } |
| 361 | } |
| 362 | return nfds; |
| 363 | } |
| 364 | |
| 365 | static void pollfds_poll(GArray *pollfds, int nfds, fd_set *rfds, |
| 366 | fd_set *wfds, fd_set *xfds) |
| 367 | { |
| 368 | int i; |
| 369 | |
| 370 | for (i = 0; i < pollfds->len; i++) { |
| 371 | GPollFD *pfd = &g_array_index(pollfds, GPollFD, i); |
| 372 | int fd = pfd->fd; |
| 373 | int revents = 0; |
| 374 | |
| 375 | if (FD_ISSET(fd, rfds)) { |
Stefan Hajnoczi | 8db165b | 2013-05-16 17:36:00 +0200 | [diff] [blame] | 376 | revents |= G_IO_IN; |
Stefan Hajnoczi | cbff4b3 | 2013-02-20 11:28:25 +0100 | [diff] [blame] | 377 | } |
| 378 | if (FD_ISSET(fd, wfds)) { |
Stefan Hajnoczi | 8db165b | 2013-05-16 17:36:00 +0200 | [diff] [blame] | 379 | revents |= G_IO_OUT; |
Stefan Hajnoczi | cbff4b3 | 2013-02-20 11:28:25 +0100 | [diff] [blame] | 380 | } |
| 381 | if (FD_ISSET(fd, xfds)) { |
| 382 | revents |= G_IO_PRI; |
| 383 | } |
| 384 | pfd->revents = revents & pfd->events; |
| 385 | } |
| 386 | } |
| 387 | |
Alex Bligh | 7b595f3 | 2013-08-21 16:02:54 +0100 | [diff] [blame] | 388 | static int os_host_main_loop_wait(int64_t timeout) |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 389 | { |
Paolo Bonzini | ea26ce7 | 2012-03-20 10:49:21 +0100 | [diff] [blame] | 390 | GMainContext *context = g_main_context_default(); |
Stefan Hajnoczi | 48ce11f | 2013-02-20 11:28:26 +0100 | [diff] [blame] | 391 | GPollFD poll_fds[1024 * 2]; /* this is probably overkill */ |
Stefan Hajnoczi | 134a03e | 2013-02-20 11:28:24 +0100 | [diff] [blame] | 392 | int select_ret = 0; |
Stefan Hajnoczi | 48ce11f | 2013-02-20 11:28:26 +0100 | [diff] [blame] | 393 | int g_poll_ret, ret, i, n_poll_fds; |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 394 | PollingEntry *pe; |
Paolo Bonzini | d3385eb | 2012-03-20 10:49:19 +0100 | [diff] [blame] | 395 | WaitObjects *w = &wait_objects; |
Stefan Weil | 42fe1c2 | 2012-04-27 17:02:08 +0200 | [diff] [blame] | 396 | gint poll_timeout; |
Alex Bligh | 7b595f3 | 2013-08-21 16:02:54 +0100 | [diff] [blame] | 397 | int64_t poll_timeout_ns; |
Paolo Bonzini | 1545553 | 2012-03-20 10:49:18 +0100 | [diff] [blame] | 398 | static struct timeval tv0; |
Stefan Hajnoczi | 9cbaacf | 2013-02-20 11:28:30 +0100 | [diff] [blame] | 399 | fd_set rfds, wfds, xfds; |
| 400 | int nfds; |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 401 | |
| 402 | /* XXX: need to suppress polling by better using win32 events */ |
| 403 | ret = 0; |
| 404 | for (pe = first_polling_entry; pe != NULL; pe = pe->next) { |
| 405 | ret |= pe->func(pe->opaque); |
| 406 | } |
Paolo Bonzini | d3385eb | 2012-03-20 10:49:19 +0100 | [diff] [blame] | 407 | if (ret != 0) { |
| 408 | return ret; |
| 409 | } |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 410 | |
Stefan Hajnoczi | 3cb8c20 | 2013-05-16 17:36:01 +0200 | [diff] [blame] | 411 | FD_ZERO(&rfds); |
| 412 | FD_ZERO(&wfds); |
| 413 | FD_ZERO(&xfds); |
| 414 | nfds = pollfds_fill(gpollfds, &rfds, &wfds, &xfds); |
| 415 | if (nfds >= 0) { |
| 416 | select_ret = select(nfds + 1, &rfds, &wfds, &xfds, &tv0); |
| 417 | if (select_ret != 0) { |
| 418 | timeout = 0; |
| 419 | } |
| 420 | if (select_ret > 0) { |
| 421 | pollfds_poll(gpollfds, nfds, &rfds, &wfds, &xfds); |
| 422 | } |
| 423 | } |
| 424 | |
Paolo Bonzini | ea26ce7 | 2012-03-20 10:49:21 +0100 | [diff] [blame] | 425 | g_main_context_prepare(context, &max_priority); |
Stefan Weil | 42fe1c2 | 2012-04-27 17:02:08 +0200 | [diff] [blame] | 426 | n_poll_fds = g_main_context_query(context, max_priority, &poll_timeout, |
Paolo Bonzini | ea26ce7 | 2012-03-20 10:49:21 +0100 | [diff] [blame] | 427 | poll_fds, ARRAY_SIZE(poll_fds)); |
| 428 | g_assert(n_poll_fds <= ARRAY_SIZE(poll_fds)); |
| 429 | |
Paolo Bonzini | 06ac7d4 | 2012-03-20 10:49:20 +0100 | [diff] [blame] | 430 | for (i = 0; i < w->num; i++) { |
Stefan Weil | 58b9630 | 2012-04-12 20:42:34 +0200 | [diff] [blame] | 431 | poll_fds[n_poll_fds + i].fd = (DWORD_PTR)w->events[i]; |
Paolo Bonzini | ea26ce7 | 2012-03-20 10:49:21 +0100 | [diff] [blame] | 432 | poll_fds[n_poll_fds + i].events = G_IO_IN; |
Paolo Bonzini | d3385eb | 2012-03-20 10:49:19 +0100 | [diff] [blame] | 433 | } |
| 434 | |
Alex Bligh | 7b595f3 | 2013-08-21 16:02:54 +0100 | [diff] [blame] | 435 | if (poll_timeout < 0) { |
| 436 | poll_timeout_ns = -1; |
| 437 | } else { |
| 438 | poll_timeout_ns = (int64_t)poll_timeout * (int64_t)SCALE_MS; |
Stefan Weil | 3239ad0 | 2012-04-29 19:15:02 +0200 | [diff] [blame] | 439 | } |
| 440 | |
Alex Bligh | 7b595f3 | 2013-08-21 16:02:54 +0100 | [diff] [blame] | 441 | poll_timeout_ns = qemu_soonest_timeout(poll_timeout_ns, timeout); |
| 442 | |
Paolo Bonzini | 06ac7d4 | 2012-03-20 10:49:20 +0100 | [diff] [blame] | 443 | qemu_mutex_unlock_iothread(); |
Alex Bligh | 7b595f3 | 2013-08-21 16:02:54 +0100 | [diff] [blame] | 444 | g_poll_ret = qemu_poll_ns(poll_fds, n_poll_fds + w->num, poll_timeout_ns); |
| 445 | |
Paolo Bonzini | 06ac7d4 | 2012-03-20 10:49:20 +0100 | [diff] [blame] | 446 | qemu_mutex_lock_iothread(); |
Fabien Chouteau | 5e3bc73 | 2013-01-08 16:30:56 +0100 | [diff] [blame] | 447 | if (g_poll_ret > 0) { |
Paolo Bonzini | 06ac7d4 | 2012-03-20 10:49:20 +0100 | [diff] [blame] | 448 | for (i = 0; i < w->num; i++) { |
Paolo Bonzini | ea26ce7 | 2012-03-20 10:49:21 +0100 | [diff] [blame] | 449 | w->revents[i] = poll_fds[n_poll_fds + i].revents; |
Paolo Bonzini | 06ac7d4 | 2012-03-20 10:49:20 +0100 | [diff] [blame] | 450 | } |
| 451 | for (i = 0; i < w->num; i++) { |
| 452 | if (w->revents[i] && w->func[i]) { |
| 453 | w->func[i](w->opaque[i]); |
| 454 | } |
| 455 | } |
| 456 | } |
Paolo Bonzini | d3385eb | 2012-03-20 10:49:19 +0100 | [diff] [blame] | 457 | |
Paolo Bonzini | ea26ce7 | 2012-03-20 10:49:21 +0100 | [diff] [blame] | 458 | if (g_main_context_check(context, max_priority, poll_fds, n_poll_fds)) { |
| 459 | g_main_context_dispatch(context); |
| 460 | } |
| 461 | |
Fabien Chouteau | 5e3bc73 | 2013-01-08 16:30:56 +0100 | [diff] [blame] | 462 | return select_ret || g_poll_ret; |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 463 | } |
| 464 | #endif |
| 465 | |
| 466 | int main_loop_wait(int nonblocking) |
| 467 | { |
Stefano Stabellini | 7c7db75 | 2012-04-13 19:35:04 +0100 | [diff] [blame] | 468 | int ret; |
| 469 | uint32_t timeout = UINT32_MAX; |
Alex Bligh | 7b595f3 | 2013-08-21 16:02:54 +0100 | [diff] [blame] | 470 | int64_t timeout_ns; |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 471 | |
| 472 | if (nonblocking) { |
| 473 | timeout = 0; |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 474 | } |
| 475 | |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 476 | /* poll any events */ |
Stefan Hajnoczi | cbff4b3 | 2013-02-20 11:28:25 +0100 | [diff] [blame] | 477 | g_array_set_size(gpollfds, 0); /* reset for new iteration */ |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 478 | /* XXX: separate device handlers from system ones */ |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 479 | #ifdef CONFIG_SLIRP |
Liu Ping Fan | a42e9c4 | 2013-08-25 10:01:21 +0800 | [diff] [blame] | 480 | slirp_pollfds_fill(gpollfds, &timeout); |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 481 | #endif |
Stefan Hajnoczi | a3e4b4a | 2013-02-20 11:28:29 +0100 | [diff] [blame] | 482 | qemu_iohandler_fill(gpollfds); |
Alex Bligh | 7b595f3 | 2013-08-21 16:02:54 +0100 | [diff] [blame] | 483 | |
| 484 | if (timeout == UINT32_MAX) { |
| 485 | timeout_ns = -1; |
| 486 | } else { |
| 487 | timeout_ns = (uint64_t)timeout * (int64_t)(SCALE_MS); |
| 488 | } |
| 489 | |
| 490 | timeout_ns = qemu_soonest_timeout(timeout_ns, |
| 491 | timerlistgroup_deadline_ns( |
| 492 | &main_loop_tlg)); |
| 493 | |
| 494 | ret = os_host_main_loop_wait(timeout_ns); |
Stefan Hajnoczi | a3e4b4a | 2013-02-20 11:28:29 +0100 | [diff] [blame] | 495 | qemu_iohandler_poll(gpollfds, ret); |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 496 | #ifdef CONFIG_SLIRP |
Stefan Hajnoczi | 8917c3b | 2013-02-20 11:28:28 +0100 | [diff] [blame] | 497 | slirp_pollfds_poll(gpollfds, (ret < 0)); |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 498 | #endif |
| 499 | |
Alex Bligh | 40daca5 | 2013-08-21 16:03:02 +0100 | [diff] [blame] | 500 | qemu_clock_run_all_timers(); |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 501 | |
Paolo Bonzini | d3b12f5 | 2011-09-13 10:30:52 +0200 | [diff] [blame] | 502 | return ret; |
| 503 | } |
Paolo Bonzini | f627aab | 2012-10-29 23:45:23 +0100 | [diff] [blame] | 504 | |
| 505 | /* Functions to operate on the main QEMU AioContext. */ |
| 506 | |
| 507 | QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque) |
| 508 | { |
| 509 | return aio_bh_new(qemu_aio_context, cb, opaque); |
| 510 | } |