The Android Open Source Project | 845e012 | 2009-03-03 19:31:34 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Event loop based on Windows events and WaitForMultipleObjects |
| 3 | * Copyright (c) 2002-2006, Jouni Malinen <j@w1.fi> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * Alternatively, this software may be distributed under the terms of BSD |
| 10 | * license. |
| 11 | * |
| 12 | * See README and COPYING for more details. |
| 13 | */ |
| 14 | |
| 15 | #include "includes.h" |
| 16 | #include <winsock2.h> |
| 17 | |
| 18 | #include "common.h" |
| 19 | #include "eloop.h" |
| 20 | |
| 21 | |
| 22 | struct eloop_sock { |
| 23 | int sock; |
| 24 | void *eloop_data; |
| 25 | void *user_data; |
| 26 | eloop_sock_handler handler; |
| 27 | WSAEVENT event; |
| 28 | }; |
| 29 | |
| 30 | struct eloop_event { |
| 31 | void *eloop_data; |
| 32 | void *user_data; |
| 33 | eloop_event_handler handler; |
| 34 | HANDLE event; |
| 35 | }; |
| 36 | |
| 37 | struct eloop_timeout { |
| 38 | struct os_time time; |
| 39 | void *eloop_data; |
| 40 | void *user_data; |
| 41 | eloop_timeout_handler handler; |
| 42 | struct eloop_timeout *next; |
| 43 | }; |
| 44 | |
| 45 | struct eloop_signal { |
| 46 | int sig; |
| 47 | void *user_data; |
| 48 | eloop_signal_handler handler; |
| 49 | int signaled; |
| 50 | }; |
| 51 | |
| 52 | struct eloop_data { |
| 53 | void *user_data; |
| 54 | |
| 55 | int max_sock; |
| 56 | size_t reader_count; |
| 57 | struct eloop_sock *readers; |
| 58 | |
| 59 | size_t event_count; |
| 60 | struct eloop_event *events; |
| 61 | |
| 62 | struct eloop_timeout *timeout; |
| 63 | |
| 64 | int signal_count; |
| 65 | struct eloop_signal *signals; |
| 66 | int signaled; |
| 67 | int pending_terminate; |
| 68 | |
| 69 | int terminate; |
| 70 | int reader_table_changed; |
| 71 | |
| 72 | struct eloop_signal term_signal; |
| 73 | HANDLE term_event; |
| 74 | |
| 75 | HANDLE *handles; |
| 76 | size_t num_handles; |
| 77 | }; |
| 78 | |
| 79 | static struct eloop_data eloop; |
| 80 | |
| 81 | |
| 82 | int eloop_init(void *user_data) |
| 83 | { |
| 84 | os_memset(&eloop, 0, sizeof(eloop)); |
| 85 | eloop.user_data = user_data; |
| 86 | eloop.num_handles = 1; |
| 87 | eloop.handles = os_malloc(eloop.num_handles * |
| 88 | sizeof(eloop.handles[0])); |
| 89 | if (eloop.handles == NULL) |
| 90 | return -1; |
| 91 | |
| 92 | eloop.term_event = CreateEvent(NULL, FALSE, FALSE, NULL); |
| 93 | if (eloop.term_event == NULL) { |
| 94 | printf("CreateEvent() failed: %d\n", |
| 95 | (int) GetLastError()); |
| 96 | os_free(eloop.handles); |
| 97 | return -1; |
| 98 | } |
| 99 | |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | |
| 104 | static int eloop_prepare_handles(void) |
| 105 | { |
| 106 | HANDLE *n; |
| 107 | |
| 108 | if (eloop.num_handles > eloop.reader_count + eloop.event_count + 8) |
| 109 | return 0; |
| 110 | n = os_realloc(eloop.handles, |
| 111 | eloop.num_handles * 2 * sizeof(eloop.handles[0])); |
| 112 | if (n == NULL) |
| 113 | return -1; |
| 114 | eloop.handles = n; |
| 115 | eloop.num_handles *= 2; |
| 116 | return 0; |
| 117 | } |
| 118 | |
| 119 | |
| 120 | int eloop_register_read_sock(int sock, eloop_sock_handler handler, |
| 121 | void *eloop_data, void *user_data) |
| 122 | { |
| 123 | WSAEVENT event; |
| 124 | struct eloop_sock *tmp; |
| 125 | |
| 126 | if (eloop_prepare_handles()) |
| 127 | return -1; |
| 128 | |
| 129 | event = WSACreateEvent(); |
| 130 | if (event == WSA_INVALID_EVENT) { |
| 131 | printf("WSACreateEvent() failed: %d\n", WSAGetLastError()); |
| 132 | return -1; |
| 133 | } |
| 134 | |
| 135 | if (WSAEventSelect(sock, event, FD_READ)) { |
| 136 | printf("WSAEventSelect() failed: %d\n", WSAGetLastError()); |
| 137 | WSACloseEvent(event); |
| 138 | return -1; |
| 139 | } |
| 140 | tmp = os_realloc(eloop.readers, |
| 141 | (eloop.reader_count + 1) * sizeof(struct eloop_sock)); |
| 142 | if (tmp == NULL) { |
| 143 | WSAEventSelect(sock, event, 0); |
| 144 | WSACloseEvent(event); |
| 145 | return -1; |
| 146 | } |
| 147 | |
| 148 | tmp[eloop.reader_count].sock = sock; |
| 149 | tmp[eloop.reader_count].eloop_data = eloop_data; |
| 150 | tmp[eloop.reader_count].user_data = user_data; |
| 151 | tmp[eloop.reader_count].handler = handler; |
| 152 | tmp[eloop.reader_count].event = event; |
| 153 | eloop.reader_count++; |
| 154 | eloop.readers = tmp; |
| 155 | if (sock > eloop.max_sock) |
| 156 | eloop.max_sock = sock; |
| 157 | eloop.reader_table_changed = 1; |
| 158 | |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | |
| 163 | void eloop_unregister_read_sock(int sock) |
| 164 | { |
| 165 | size_t i; |
| 166 | |
| 167 | if (eloop.readers == NULL || eloop.reader_count == 0) |
| 168 | return; |
| 169 | |
| 170 | for (i = 0; i < eloop.reader_count; i++) { |
| 171 | if (eloop.readers[i].sock == sock) |
| 172 | break; |
| 173 | } |
| 174 | if (i == eloop.reader_count) |
| 175 | return; |
| 176 | |
| 177 | WSAEventSelect(eloop.readers[i].sock, eloop.readers[i].event, 0); |
| 178 | WSACloseEvent(eloop.readers[i].event); |
| 179 | |
| 180 | if (i != eloop.reader_count - 1) { |
| 181 | os_memmove(&eloop.readers[i], &eloop.readers[i + 1], |
| 182 | (eloop.reader_count - i - 1) * |
| 183 | sizeof(struct eloop_sock)); |
| 184 | } |
| 185 | eloop.reader_count--; |
| 186 | eloop.reader_table_changed = 1; |
| 187 | } |
| 188 | |
| 189 | |
| 190 | int eloop_register_event(void *event, size_t event_size, |
| 191 | eloop_event_handler handler, |
| 192 | void *eloop_data, void *user_data) |
| 193 | { |
| 194 | struct eloop_event *tmp; |
| 195 | HANDLE h = event; |
| 196 | |
| 197 | if (event_size != sizeof(HANDLE) || h == INVALID_HANDLE_VALUE) |
| 198 | return -1; |
| 199 | |
| 200 | if (eloop_prepare_handles()) |
| 201 | return -1; |
| 202 | |
| 203 | tmp = os_realloc(eloop.events, |
| 204 | (eloop.event_count + 1) * sizeof(struct eloop_event)); |
| 205 | if (tmp == NULL) |
| 206 | return -1; |
| 207 | |
| 208 | tmp[eloop.event_count].eloop_data = eloop_data; |
| 209 | tmp[eloop.event_count].user_data = user_data; |
| 210 | tmp[eloop.event_count].handler = handler; |
| 211 | tmp[eloop.event_count].event = h; |
| 212 | eloop.event_count++; |
| 213 | eloop.events = tmp; |
| 214 | |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | |
| 219 | void eloop_unregister_event(void *event, size_t event_size) |
| 220 | { |
| 221 | size_t i; |
| 222 | HANDLE h = event; |
| 223 | |
| 224 | if (eloop.events == NULL || eloop.event_count == 0 || |
| 225 | event_size != sizeof(HANDLE)) |
| 226 | return; |
| 227 | |
| 228 | for (i = 0; i < eloop.event_count; i++) { |
| 229 | if (eloop.events[i].event == h) |
| 230 | break; |
| 231 | } |
| 232 | if (i == eloop.event_count) |
| 233 | return; |
| 234 | |
| 235 | if (i != eloop.event_count - 1) { |
| 236 | os_memmove(&eloop.events[i], &eloop.events[i + 1], |
| 237 | (eloop.event_count - i - 1) * |
| 238 | sizeof(struct eloop_event)); |
| 239 | } |
| 240 | eloop.event_count--; |
| 241 | } |
| 242 | |
| 243 | |
| 244 | int eloop_register_timeout(unsigned int secs, unsigned int usecs, |
| 245 | eloop_timeout_handler handler, |
| 246 | void *eloop_data, void *user_data) |
| 247 | { |
| 248 | struct eloop_timeout *timeout, *tmp, *prev; |
| 249 | |
| 250 | timeout = os_malloc(sizeof(*timeout)); |
| 251 | if (timeout == NULL) |
| 252 | return -1; |
| 253 | os_get_time(&timeout->time); |
| 254 | timeout->time.sec += secs; |
| 255 | timeout->time.usec += usecs; |
| 256 | while (timeout->time.usec >= 1000000) { |
| 257 | timeout->time.sec++; |
| 258 | timeout->time.usec -= 1000000; |
| 259 | } |
| 260 | timeout->eloop_data = eloop_data; |
| 261 | timeout->user_data = user_data; |
| 262 | timeout->handler = handler; |
| 263 | timeout->next = NULL; |
| 264 | |
| 265 | if (eloop.timeout == NULL) { |
| 266 | eloop.timeout = timeout; |
| 267 | return 0; |
| 268 | } |
| 269 | |
| 270 | prev = NULL; |
| 271 | tmp = eloop.timeout; |
| 272 | while (tmp != NULL) { |
| 273 | if (os_time_before(&timeout->time, &tmp->time)) |
| 274 | break; |
| 275 | prev = tmp; |
| 276 | tmp = tmp->next; |
| 277 | } |
| 278 | |
| 279 | if (prev == NULL) { |
| 280 | timeout->next = eloop.timeout; |
| 281 | eloop.timeout = timeout; |
| 282 | } else { |
| 283 | timeout->next = prev->next; |
| 284 | prev->next = timeout; |
| 285 | } |
| 286 | |
| 287 | return 0; |
| 288 | } |
| 289 | |
| 290 | |
| 291 | int eloop_cancel_timeout(eloop_timeout_handler handler, |
| 292 | void *eloop_data, void *user_data) |
| 293 | { |
| 294 | struct eloop_timeout *timeout, *prev, *next; |
| 295 | int removed = 0; |
| 296 | |
| 297 | prev = NULL; |
| 298 | timeout = eloop.timeout; |
| 299 | while (timeout != NULL) { |
| 300 | next = timeout->next; |
| 301 | |
| 302 | if (timeout->handler == handler && |
| 303 | (timeout->eloop_data == eloop_data || |
| 304 | eloop_data == ELOOP_ALL_CTX) && |
| 305 | (timeout->user_data == user_data || |
| 306 | user_data == ELOOP_ALL_CTX)) { |
| 307 | if (prev == NULL) |
| 308 | eloop.timeout = next; |
| 309 | else |
| 310 | prev->next = next; |
| 311 | os_free(timeout); |
| 312 | removed++; |
| 313 | } else |
| 314 | prev = timeout; |
| 315 | |
| 316 | timeout = next; |
| 317 | } |
| 318 | |
| 319 | return removed; |
| 320 | } |
| 321 | |
| 322 | |
Dmitry Shmidt | dc9507e | 2009-04-16 11:38:56 -0700 | [diff] [blame] | 323 | int eloop_is_timeout_registered(eloop_timeout_handler handler, |
| 324 | void *eloop_data, void *user_data) |
| 325 | { |
| 326 | struct eloop_timeout *tmp; |
| 327 | |
| 328 | tmp = eloop.timeout; |
| 329 | while (tmp != NULL) { |
| 330 | if (tmp->handler == handler && |
| 331 | tmp->eloop_data == eloop_data && |
| 332 | tmp->user_data == user_data) |
| 333 | return 1; |
| 334 | |
| 335 | tmp = tmp->next; |
| 336 | } |
| 337 | |
| 338 | return 0; |
| 339 | } |
| 340 | |
| 341 | |
The Android Open Source Project | 845e012 | 2009-03-03 19:31:34 -0800 | [diff] [blame] | 342 | /* TODO: replace with suitable signal handler */ |
| 343 | #if 0 |
| 344 | static void eloop_handle_signal(int sig) |
| 345 | { |
| 346 | int i; |
| 347 | |
| 348 | eloop.signaled++; |
| 349 | for (i = 0; i < eloop.signal_count; i++) { |
| 350 | if (eloop.signals[i].sig == sig) { |
| 351 | eloop.signals[i].signaled++; |
| 352 | break; |
| 353 | } |
| 354 | } |
| 355 | } |
| 356 | #endif |
| 357 | |
| 358 | |
| 359 | static void eloop_process_pending_signals(void) |
| 360 | { |
| 361 | int i; |
| 362 | |
| 363 | if (eloop.signaled == 0) |
| 364 | return; |
| 365 | eloop.signaled = 0; |
| 366 | |
| 367 | if (eloop.pending_terminate) { |
| 368 | eloop.pending_terminate = 0; |
| 369 | } |
| 370 | |
| 371 | for (i = 0; i < eloop.signal_count; i++) { |
| 372 | if (eloop.signals[i].signaled) { |
| 373 | eloop.signals[i].signaled = 0; |
| 374 | eloop.signals[i].handler(eloop.signals[i].sig, |
| 375 | eloop.user_data, |
| 376 | eloop.signals[i].user_data); |
| 377 | } |
| 378 | } |
| 379 | |
| 380 | if (eloop.term_signal.signaled) { |
| 381 | eloop.term_signal.signaled = 0; |
| 382 | eloop.term_signal.handler(eloop.term_signal.sig, |
| 383 | eloop.user_data, |
| 384 | eloop.term_signal.user_data); |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | |
| 389 | int eloop_register_signal(int sig, eloop_signal_handler handler, |
| 390 | void *user_data) |
| 391 | { |
| 392 | struct eloop_signal *tmp; |
| 393 | |
| 394 | tmp = os_realloc(eloop.signals, |
| 395 | (eloop.signal_count + 1) * |
| 396 | sizeof(struct eloop_signal)); |
| 397 | if (tmp == NULL) |
| 398 | return -1; |
| 399 | |
| 400 | tmp[eloop.signal_count].sig = sig; |
| 401 | tmp[eloop.signal_count].user_data = user_data; |
| 402 | tmp[eloop.signal_count].handler = handler; |
| 403 | tmp[eloop.signal_count].signaled = 0; |
| 404 | eloop.signal_count++; |
| 405 | eloop.signals = tmp; |
| 406 | |
| 407 | /* TODO: register signal handler */ |
| 408 | |
| 409 | return 0; |
| 410 | } |
| 411 | |
| 412 | |
| 413 | #ifndef _WIN32_WCE |
| 414 | static BOOL eloop_handle_console_ctrl(DWORD type) |
| 415 | { |
| 416 | switch (type) { |
| 417 | case CTRL_C_EVENT: |
| 418 | case CTRL_BREAK_EVENT: |
| 419 | eloop.signaled++; |
| 420 | eloop.term_signal.signaled++; |
| 421 | SetEvent(eloop.term_event); |
| 422 | return TRUE; |
| 423 | default: |
| 424 | return FALSE; |
| 425 | } |
| 426 | } |
| 427 | #endif /* _WIN32_WCE */ |
| 428 | |
| 429 | |
| 430 | int eloop_register_signal_terminate(eloop_signal_handler handler, |
| 431 | void *user_data) |
| 432 | { |
| 433 | #ifndef _WIN32_WCE |
| 434 | if (SetConsoleCtrlHandler((PHANDLER_ROUTINE) eloop_handle_console_ctrl, |
| 435 | TRUE) == 0) { |
| 436 | printf("SetConsoleCtrlHandler() failed: %d\n", |
| 437 | (int) GetLastError()); |
| 438 | return -1; |
| 439 | } |
| 440 | #endif /* _WIN32_WCE */ |
| 441 | |
| 442 | eloop.term_signal.handler = handler; |
| 443 | eloop.term_signal.user_data = user_data; |
| 444 | |
| 445 | return 0; |
| 446 | } |
| 447 | |
| 448 | |
| 449 | int eloop_register_signal_reconfig(eloop_signal_handler handler, |
| 450 | void *user_data) |
| 451 | { |
| 452 | /* TODO */ |
| 453 | return 0; |
| 454 | } |
| 455 | |
| 456 | |
| 457 | void eloop_run(void) |
| 458 | { |
| 459 | struct os_time tv, now; |
| 460 | DWORD count, ret, timeout, err; |
| 461 | size_t i; |
| 462 | |
| 463 | while (!eloop.terminate && |
| 464 | (eloop.timeout || eloop.reader_count > 0 || |
| 465 | eloop.event_count > 0)) { |
| 466 | if (eloop.timeout) { |
| 467 | os_get_time(&now); |
| 468 | if (os_time_before(&now, &eloop.timeout->time)) |
| 469 | os_time_sub(&eloop.timeout->time, &now, &tv); |
| 470 | else |
| 471 | tv.sec = tv.usec = 0; |
| 472 | } |
| 473 | |
| 474 | count = 0; |
| 475 | for (i = 0; i < eloop.event_count; i++) |
| 476 | eloop.handles[count++] = eloop.events[i].event; |
| 477 | |
| 478 | for (i = 0; i < eloop.reader_count; i++) |
| 479 | eloop.handles[count++] = eloop.readers[i].event; |
| 480 | |
| 481 | if (eloop.term_event) |
| 482 | eloop.handles[count++] = eloop.term_event; |
| 483 | |
| 484 | if (eloop.timeout) |
| 485 | timeout = tv.sec * 1000 + tv.usec / 1000; |
| 486 | else |
| 487 | timeout = INFINITE; |
| 488 | |
| 489 | if (count > MAXIMUM_WAIT_OBJECTS) { |
| 490 | printf("WaitForMultipleObjects: Too many events: " |
| 491 | "%d > %d (ignoring extra events)\n", |
| 492 | (int) count, MAXIMUM_WAIT_OBJECTS); |
| 493 | count = MAXIMUM_WAIT_OBJECTS; |
| 494 | } |
| 495 | #ifdef _WIN32_WCE |
| 496 | ret = WaitForMultipleObjects(count, eloop.handles, FALSE, |
| 497 | timeout); |
| 498 | #else /* _WIN32_WCE */ |
| 499 | ret = WaitForMultipleObjectsEx(count, eloop.handles, FALSE, |
| 500 | timeout, TRUE); |
| 501 | #endif /* _WIN32_WCE */ |
| 502 | err = GetLastError(); |
| 503 | |
| 504 | eloop_process_pending_signals(); |
| 505 | |
| 506 | /* check if some registered timeouts have occurred */ |
| 507 | if (eloop.timeout) { |
| 508 | struct eloop_timeout *tmp; |
| 509 | |
| 510 | os_get_time(&now); |
| 511 | if (!os_time_before(&now, &eloop.timeout->time)) { |
| 512 | tmp = eloop.timeout; |
| 513 | eloop.timeout = eloop.timeout->next; |
| 514 | tmp->handler(tmp->eloop_data, |
| 515 | tmp->user_data); |
| 516 | os_free(tmp); |
| 517 | } |
| 518 | |
| 519 | } |
| 520 | |
| 521 | if (ret == WAIT_FAILED) { |
| 522 | printf("WaitForMultipleObjects(count=%d) failed: %d\n", |
| 523 | (int) count, (int) err); |
| 524 | os_sleep(1, 0); |
| 525 | continue; |
| 526 | } |
| 527 | |
| 528 | #ifndef _WIN32_WCE |
| 529 | if (ret == WAIT_IO_COMPLETION) |
| 530 | continue; |
| 531 | #endif /* _WIN32_WCE */ |
| 532 | |
| 533 | if (ret == WAIT_TIMEOUT) |
| 534 | continue; |
| 535 | |
| 536 | while (ret >= WAIT_OBJECT_0 && |
| 537 | ret < WAIT_OBJECT_0 + eloop.event_count) { |
| 538 | eloop.events[ret].handler( |
| 539 | eloop.events[ret].eloop_data, |
| 540 | eloop.events[ret].user_data); |
| 541 | ret = WaitForMultipleObjects(eloop.event_count, |
| 542 | eloop.handles, FALSE, 0); |
| 543 | } |
| 544 | |
| 545 | eloop.reader_table_changed = 0; |
| 546 | for (i = 0; i < eloop.reader_count; i++) { |
| 547 | WSANETWORKEVENTS events; |
| 548 | if (WSAEnumNetworkEvents(eloop.readers[i].sock, |
| 549 | eloop.readers[i].event, |
| 550 | &events) == 0 && |
| 551 | (events.lNetworkEvents & FD_READ)) { |
| 552 | eloop.readers[i].handler( |
| 553 | eloop.readers[i].sock, |
| 554 | eloop.readers[i].eloop_data, |
| 555 | eloop.readers[i].user_data); |
| 556 | if (eloop.reader_table_changed) |
| 557 | break; |
| 558 | } |
| 559 | } |
| 560 | } |
| 561 | } |
| 562 | |
| 563 | |
| 564 | void eloop_terminate(void) |
| 565 | { |
| 566 | eloop.terminate = 1; |
| 567 | SetEvent(eloop.term_event); |
| 568 | } |
| 569 | |
| 570 | |
| 571 | void eloop_destroy(void) |
| 572 | { |
| 573 | struct eloop_timeout *timeout, *prev; |
| 574 | |
| 575 | timeout = eloop.timeout; |
| 576 | while (timeout != NULL) { |
| 577 | prev = timeout; |
| 578 | timeout = timeout->next; |
| 579 | os_free(prev); |
| 580 | } |
| 581 | os_free(eloop.readers); |
| 582 | os_free(eloop.signals); |
| 583 | if (eloop.term_event) |
| 584 | CloseHandle(eloop.term_event); |
| 585 | os_free(eloop.handles); |
| 586 | eloop.handles = NULL; |
| 587 | os_free(eloop.events); |
| 588 | eloop.events = NULL; |
| 589 | } |
| 590 | |
| 591 | |
| 592 | int eloop_terminated(void) |
| 593 | { |
| 594 | return eloop.terminate; |
| 595 | } |
| 596 | |
| 597 | |
| 598 | void eloop_wait_for_read_sock(int sock) |
| 599 | { |
| 600 | WSAEVENT event; |
| 601 | |
| 602 | event = WSACreateEvent(); |
| 603 | if (event == WSA_INVALID_EVENT) { |
| 604 | printf("WSACreateEvent() failed: %d\n", WSAGetLastError()); |
| 605 | return; |
| 606 | } |
| 607 | |
| 608 | if (WSAEventSelect(sock, event, FD_READ)) { |
| 609 | printf("WSAEventSelect() failed: %d\n", WSAGetLastError()); |
| 610 | WSACloseEvent(event); |
| 611 | return ; |
| 612 | } |
| 613 | |
| 614 | WaitForSingleObject(event, INFINITE); |
| 615 | WSAEventSelect(sock, event, 0); |
| 616 | WSACloseEvent(event); |
| 617 | } |
| 618 | |
| 619 | |
| 620 | void * eloop_get_user_data(void) |
| 621 | { |
| 622 | return eloop.user_data; |
| 623 | } |