| 1 |
/* |
| 2 |
* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> |
| 3 |
* All rights reserved. |
| 4 |
* |
| 5 |
* Redistribution and use in source and binary forms, with or without |
| 6 |
* modification, are permitted provided that the following conditions are |
| 7 |
* met: |
| 8 |
* |
| 9 |
* * Redistributions of source code must retain the above copyright |
| 10 |
* notice, this list of conditions and the following disclaimer. |
| 11 |
* |
| 12 |
* * Redistributions in binary form must reproduce the above |
| 13 |
* copyright notice, this list of conditions and the following |
| 14 |
* disclaimer in the documentation and/or other materials provided |
| 15 |
* with the distribution. |
| 16 |
* |
| 17 |
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 18 |
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 19 |
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 20 |
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 21 |
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 22 |
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 23 |
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 24 |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 25 |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 26 |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 27 |
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 |
*/ |
| 29 |
|
| 30 |
#include <math.h> |
| 31 |
#include <stdlib.h> |
| 32 |
#include <unistd.h> |
| 33 |
#include <fcntl.h> |
| 34 |
#include <signal.h> |
| 35 |
#include <stddef.h> |
| 36 |
|
| 37 |
#include <stdio.h> |
| 38 |
|
| 39 |
#include <assert.h> |
| 40 |
#include <errno.h> |
| 41 |
#include <sys/time.h> |
| 42 |
#include <time.h> |
| 43 |
|
| 44 |
#ifndef HAVE_MONOTONIC |
| 45 |
# ifdef CLOCK_MONOTONIC |
| 46 |
# define HAVE_MONOTONIC 1 |
| 47 |
# endif |
| 48 |
#endif |
| 49 |
|
| 50 |
#ifndef HAVE_SELECT |
| 51 |
# define HAVE_SELECT 1 |
| 52 |
#endif |
| 53 |
|
| 54 |
#ifndef HAVE_EPOLL |
| 55 |
# define HAVE_EPOLL 0 |
| 56 |
#endif |
| 57 |
|
| 58 |
#ifndef HAVE_REALTIME |
| 59 |
# define HAVE_REALTIME 1 /* posix requirement, but might be slower */ |
| 60 |
#endif |
| 61 |
|
| 62 |
#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ |
| 63 |
#define MAX_BLOCKTIME 60. |
| 64 |
|
| 65 |
#include "ev.h" |
| 66 |
|
| 67 |
typedef struct ev_watcher *W; |
| 68 |
typedef struct ev_watcher_list *WL; |
| 69 |
typedef struct ev_watcher_time *WT; |
| 70 |
|
| 71 |
static ev_tstamp now, diff; /* monotonic clock */ |
| 72 |
ev_tstamp ev_now; |
| 73 |
int ev_method; |
| 74 |
|
| 75 |
static int have_monotonic; /* runtime */ |
| 76 |
|
| 77 |
static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ |
| 78 |
static void (*method_modify)(int fd, int oev, int nev); |
| 79 |
static void (*method_poll)(ev_tstamp timeout); |
| 80 |
|
| 81 |
/*****************************************************************************/ |
| 82 |
|
| 83 |
ev_tstamp |
| 84 |
ev_time (void) |
| 85 |
{ |
| 86 |
#if HAVE_REALTIME |
| 87 |
struct timespec ts; |
| 88 |
clock_gettime (CLOCK_REALTIME, &ts); |
| 89 |
return ts.tv_sec + ts.tv_nsec * 1e-9; |
| 90 |
#else |
| 91 |
struct timeval tv; |
| 92 |
gettimeofday (&tv, 0); |
| 93 |
return tv.tv_sec + tv.tv_usec * 1e-6; |
| 94 |
#endif |
| 95 |
} |
| 96 |
|
| 97 |
static ev_tstamp |
| 98 |
get_clock (void) |
| 99 |
{ |
| 100 |
#if HAVE_MONOTONIC |
| 101 |
if (have_monotonic) |
| 102 |
{ |
| 103 |
struct timespec ts; |
| 104 |
clock_gettime (CLOCK_MONOTONIC, &ts); |
| 105 |
return ts.tv_sec + ts.tv_nsec * 1e-9; |
| 106 |
} |
| 107 |
#endif |
| 108 |
|
| 109 |
return ev_time (); |
| 110 |
} |
| 111 |
|
| 112 |
#define array_needsize(base,cur,cnt,init) \ |
| 113 |
if ((cnt) > cur) \ |
| 114 |
{ \ |
| 115 |
int newcnt = cur ? cur << 1 : 16; \ |
| 116 |
base = realloc (base, sizeof (*base) * (newcnt)); \ |
| 117 |
init (base + cur, newcnt - cur); \ |
| 118 |
cur = newcnt; \ |
| 119 |
} |
| 120 |
|
| 121 |
/*****************************************************************************/ |
| 122 |
|
| 123 |
typedef struct |
| 124 |
{ |
| 125 |
struct ev_io *head; |
| 126 |
unsigned char wev, rev; /* want, received event set */ |
| 127 |
} ANFD; |
| 128 |
|
| 129 |
static ANFD *anfds; |
| 130 |
static int anfdmax; |
| 131 |
|
| 132 |
static int *fdchanges; |
| 133 |
static int fdchangemax, fdchangecnt; |
| 134 |
|
| 135 |
static void |
| 136 |
anfds_init (ANFD *base, int count) |
| 137 |
{ |
| 138 |
while (count--) |
| 139 |
{ |
| 140 |
base->head = 0; |
| 141 |
base->wev = base->rev = EV_NONE; |
| 142 |
++base; |
| 143 |
} |
| 144 |
} |
| 145 |
|
| 146 |
typedef struct |
| 147 |
{ |
| 148 |
W w; |
| 149 |
int events; |
| 150 |
} ANPENDING; |
| 151 |
|
| 152 |
static ANPENDING *pendings; |
| 153 |
static int pendingmax, pendingcnt; |
| 154 |
|
| 155 |
static void |
| 156 |
event (W w, int events) |
| 157 |
{ |
| 158 |
if (w->active) |
| 159 |
{ |
| 160 |
w->pending = ++pendingcnt; |
| 161 |
array_needsize (pendings, pendingmax, pendingcnt, ); |
| 162 |
pendings [pendingcnt - 1].w = w; |
| 163 |
pendings [pendingcnt - 1].events = events; |
| 164 |
} |
| 165 |
} |
| 166 |
|
| 167 |
static void |
| 168 |
fd_event (int fd, int events) |
| 169 |
{ |
| 170 |
ANFD *anfd = anfds + fd; |
| 171 |
struct ev_io *w; |
| 172 |
|
| 173 |
for (w = anfd->head; w; w = w->next) |
| 174 |
{ |
| 175 |
int ev = w->events & events; |
| 176 |
|
| 177 |
if (ev) |
| 178 |
event ((W)w, ev); |
| 179 |
} |
| 180 |
} |
| 181 |
|
| 182 |
static void |
| 183 |
queue_events (W *events, int eventcnt, int type) |
| 184 |
{ |
| 185 |
int i; |
| 186 |
|
| 187 |
for (i = 0; i < eventcnt; ++i) |
| 188 |
event (events [i], type); |
| 189 |
} |
| 190 |
|
| 191 |
/* called on EBADF to verify fds */ |
| 192 |
static void |
| 193 |
fd_recheck () |
| 194 |
{ |
| 195 |
int fd; |
| 196 |
|
| 197 |
for (fd = 0; fd < anfdmax; ++fd) |
| 198 |
if (anfds [fd].wev) |
| 199 |
if (fcntl (fd, F_GETFD) == -1 && errno == EBADF) |
| 200 |
while (anfds [fd].head) |
| 201 |
evio_stop (anfds [fd].head); |
| 202 |
} |
| 203 |
|
| 204 |
/*****************************************************************************/ |
| 205 |
|
| 206 |
static struct ev_timer **timers; |
| 207 |
static int timermax, timercnt; |
| 208 |
|
| 209 |
static struct ev_periodic **periodics; |
| 210 |
static int periodicmax, periodiccnt; |
| 211 |
|
| 212 |
static void |
| 213 |
upheap (WT *timers, int k) |
| 214 |
{ |
| 215 |
WT w = timers [k]; |
| 216 |
|
| 217 |
while (k && timers [k >> 1]->at > w->at) |
| 218 |
{ |
| 219 |
timers [k] = timers [k >> 1]; |
| 220 |
timers [k]->active = k + 1; |
| 221 |
k >>= 1; |
| 222 |
} |
| 223 |
|
| 224 |
timers [k] = w; |
| 225 |
timers [k]->active = k + 1; |
| 226 |
|
| 227 |
} |
| 228 |
|
| 229 |
static void |
| 230 |
downheap (WT *timers, int N, int k) |
| 231 |
{ |
| 232 |
WT w = timers [k]; |
| 233 |
|
| 234 |
while (k < (N >> 1)) |
| 235 |
{ |
| 236 |
int j = k << 1; |
| 237 |
|
| 238 |
if (j + 1 < N && timers [j]->at > timers [j + 1]->at) |
| 239 |
++j; |
| 240 |
|
| 241 |
if (w->at <= timers [j]->at) |
| 242 |
break; |
| 243 |
|
| 244 |
timers [k] = timers [j]; |
| 245 |
timers [k]->active = k + 1; |
| 246 |
k = j; |
| 247 |
} |
| 248 |
|
| 249 |
timers [k] = w; |
| 250 |
timers [k]->active = k + 1; |
| 251 |
} |
| 252 |
|
| 253 |
/*****************************************************************************/ |
| 254 |
|
| 255 |
typedef struct |
| 256 |
{ |
| 257 |
struct ev_signal *head; |
| 258 |
sig_atomic_t gotsig; |
| 259 |
} ANSIG; |
| 260 |
|
| 261 |
static ANSIG *signals; |
| 262 |
static int signalmax; |
| 263 |
|
| 264 |
static int sigpipe [2]; |
| 265 |
static sig_atomic_t gotsig; |
| 266 |
static struct ev_io sigev; |
| 267 |
|
| 268 |
static void |
| 269 |
signals_init (ANSIG *base, int count) |
| 270 |
{ |
| 271 |
while (count--) |
| 272 |
{ |
| 273 |
base->head = 0; |
| 274 |
base->gotsig = 0; |
| 275 |
++base; |
| 276 |
} |
| 277 |
} |
| 278 |
|
| 279 |
static void |
| 280 |
sighandler (int signum) |
| 281 |
{ |
| 282 |
signals [signum - 1].gotsig = 1; |
| 283 |
|
| 284 |
if (!gotsig) |
| 285 |
{ |
| 286 |
gotsig = 1; |
| 287 |
write (sigpipe [1], &gotsig, 1); |
| 288 |
} |
| 289 |
} |
| 290 |
|
| 291 |
static void |
| 292 |
sigcb (struct ev_io *iow, int revents) |
| 293 |
{ |
| 294 |
struct ev_signal *w; |
| 295 |
int sig; |
| 296 |
|
| 297 |
gotsig = 0; |
| 298 |
read (sigpipe [0], &revents, 1); |
| 299 |
|
| 300 |
for (sig = signalmax; sig--; ) |
| 301 |
if (signals [sig].gotsig) |
| 302 |
{ |
| 303 |
signals [sig].gotsig = 0; |
| 304 |
|
| 305 |
for (w = signals [sig].head; w; w = w->next) |
| 306 |
event ((W)w, EV_SIGNAL); |
| 307 |
} |
| 308 |
} |
| 309 |
|
| 310 |
static void |
| 311 |
siginit (void) |
| 312 |
{ |
| 313 |
fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC); |
| 314 |
fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC); |
| 315 |
|
| 316 |
/* rather than sort out wether we really need nb, set it */ |
| 317 |
fcntl (sigpipe [0], F_SETFL, O_NONBLOCK); |
| 318 |
fcntl (sigpipe [1], F_SETFL, O_NONBLOCK); |
| 319 |
|
| 320 |
evio_set (&sigev, sigpipe [0], EV_READ); |
| 321 |
evio_start (&sigev); |
| 322 |
} |
| 323 |
|
| 324 |
/*****************************************************************************/ |
| 325 |
|
| 326 |
static struct ev_idle **idles; |
| 327 |
static int idlemax, idlecnt; |
| 328 |
|
| 329 |
static struct ev_check **checks; |
| 330 |
static int checkmax, checkcnt; |
| 331 |
|
| 332 |
/*****************************************************************************/ |
| 333 |
|
| 334 |
#if HAVE_EPOLL |
| 335 |
# include "ev_epoll.c" |
| 336 |
#endif |
| 337 |
#if HAVE_SELECT |
| 338 |
# include "ev_select.c" |
| 339 |
#endif |
| 340 |
|
| 341 |
int ev_init (int flags) |
| 342 |
{ |
| 343 |
#if HAVE_MONOTONIC |
| 344 |
{ |
| 345 |
struct timespec ts; |
| 346 |
if (!clock_gettime (CLOCK_MONOTONIC, &ts)) |
| 347 |
have_monotonic = 1; |
| 348 |
} |
| 349 |
#endif |
| 350 |
|
| 351 |
ev_now = ev_time (); |
| 352 |
now = get_clock (); |
| 353 |
diff = ev_now - now; |
| 354 |
|
| 355 |
if (pipe (sigpipe)) |
| 356 |
return 0; |
| 357 |
|
| 358 |
ev_method = EVMETHOD_NONE; |
| 359 |
#if HAVE_EPOLL |
| 360 |
if (ev_method == EVMETHOD_NONE) epoll_init (flags); |
| 361 |
#endif |
| 362 |
#if HAVE_SELECT |
| 363 |
if (ev_method == EVMETHOD_NONE) select_init (flags); |
| 364 |
#endif |
| 365 |
|
| 366 |
if (ev_method) |
| 367 |
{ |
| 368 |
evw_init (&sigev, sigcb); |
| 369 |
siginit (); |
| 370 |
} |
| 371 |
|
| 372 |
return ev_method; |
| 373 |
} |
| 374 |
|
| 375 |
/*****************************************************************************/ |
| 376 |
|
| 377 |
void ev_prefork (void) |
| 378 |
{ |
| 379 |
/* nop */ |
| 380 |
} |
| 381 |
|
| 382 |
void ev_postfork_parent (void) |
| 383 |
{ |
| 384 |
/* nop */ |
| 385 |
} |
| 386 |
|
| 387 |
void ev_postfork_child (void) |
| 388 |
{ |
| 389 |
#if HAVE_EPOLL |
| 390 |
if (ev_method == EVMETHOD_EPOLL) |
| 391 |
epoll_postfork_child (); |
| 392 |
#endif |
| 393 |
|
| 394 |
evio_stop (&sigev); |
| 395 |
close (sigpipe [0]); |
| 396 |
close (sigpipe [1]); |
| 397 |
pipe (sigpipe); |
| 398 |
siginit (); |
| 399 |
} |
| 400 |
|
| 401 |
/*****************************************************************************/ |
| 402 |
|
| 403 |
static void |
| 404 |
fd_reify (void) |
| 405 |
{ |
| 406 |
int i; |
| 407 |
|
| 408 |
for (i = 0; i < fdchangecnt; ++i) |
| 409 |
{ |
| 410 |
int fd = fdchanges [i]; |
| 411 |
ANFD *anfd = anfds + fd; |
| 412 |
struct ev_io *w; |
| 413 |
|
| 414 |
int wev = 0; |
| 415 |
|
| 416 |
for (w = anfd->head; w; w = w->next) |
| 417 |
wev |= w->events; |
| 418 |
|
| 419 |
if (anfd->wev != wev) |
| 420 |
{ |
| 421 |
method_modify (fd, anfd->wev, wev); |
| 422 |
anfd->wev = wev; |
| 423 |
} |
| 424 |
} |
| 425 |
|
| 426 |
fdchangecnt = 0; |
| 427 |
} |
| 428 |
|
| 429 |
static void |
| 430 |
call_pending () |
| 431 |
{ |
| 432 |
while (pendingcnt) |
| 433 |
{ |
| 434 |
ANPENDING *p = pendings + --pendingcnt; |
| 435 |
|
| 436 |
if (p->w) |
| 437 |
{ |
| 438 |
p->w->pending = 0; |
| 439 |
p->w->cb (p->w, p->events); |
| 440 |
} |
| 441 |
} |
| 442 |
} |
| 443 |
|
| 444 |
static void |
| 445 |
timers_reify () |
| 446 |
{ |
| 447 |
while (timercnt && timers [0]->at <= now) |
| 448 |
{ |
| 449 |
struct ev_timer *w = timers [0]; |
| 450 |
|
| 451 |
event ((W)w, EV_TIMEOUT); |
| 452 |
|
| 453 |
/* first reschedule or stop timer */ |
| 454 |
if (w->repeat) |
| 455 |
{ |
| 456 |
w->at = now + w->repeat; |
| 457 |
assert (("timer timeout in the past, negative repeat?", w->at > now)); |
| 458 |
downheap ((WT *)timers, timercnt, 0); |
| 459 |
} |
| 460 |
else |
| 461 |
evtimer_stop (w); /* nonrepeating: stop timer */ |
| 462 |
} |
| 463 |
} |
| 464 |
|
| 465 |
static void |
| 466 |
periodics_reify () |
| 467 |
{ |
| 468 |
while (periodiccnt && periodics [0]->at <= ev_now) |
| 469 |
{ |
| 470 |
struct ev_periodic *w = periodics [0]; |
| 471 |
|
| 472 |
/* first reschedule or stop timer */ |
| 473 |
if (w->interval) |
| 474 |
{ |
| 475 |
w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval; |
| 476 |
assert (("periodic timeout in the past, negative interval?", w->at > ev_now)); |
| 477 |
downheap ((WT *)periodics, periodiccnt, 0); |
| 478 |
} |
| 479 |
else |
| 480 |
evperiodic_stop (w); /* nonrepeating: stop timer */ |
| 481 |
|
| 482 |
event ((W)w, EV_TIMEOUT); |
| 483 |
} |
| 484 |
} |
| 485 |
|
| 486 |
static void |
| 487 |
periodics_reschedule (ev_tstamp diff) |
| 488 |
{ |
| 489 |
int i; |
| 490 |
|
| 491 |
/* adjust periodics after time jump */ |
| 492 |
for (i = 0; i < periodiccnt; ++i) |
| 493 |
{ |
| 494 |
struct ev_periodic *w = periodics [i]; |
| 495 |
|
| 496 |
if (w->interval) |
| 497 |
{ |
| 498 |
ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval; |
| 499 |
|
| 500 |
if (fabs (diff) >= 1e-4) |
| 501 |
{ |
| 502 |
evperiodic_stop (w); |
| 503 |
evperiodic_start (w); |
| 504 |
|
| 505 |
i = 0; /* restart loop, inefficient, but time jumps should be rare */ |
| 506 |
} |
| 507 |
} |
| 508 |
} |
| 509 |
} |
| 510 |
|
| 511 |
static void |
| 512 |
time_update () |
| 513 |
{ |
| 514 |
int i; |
| 515 |
|
| 516 |
ev_now = ev_time (); |
| 517 |
|
| 518 |
if (have_monotonic) |
| 519 |
{ |
| 520 |
ev_tstamp odiff = diff; |
| 521 |
|
| 522 |
for (i = 4; --i; ) /* loop a few times, before making important decisions */ |
| 523 |
{ |
| 524 |
now = get_clock (); |
| 525 |
diff = ev_now - now; |
| 526 |
|
| 527 |
if (fabs (odiff - diff) < MIN_TIMEJUMP) |
| 528 |
return; /* all is well */ |
| 529 |
|
| 530 |
ev_now = ev_time (); |
| 531 |
} |
| 532 |
|
| 533 |
periodics_reschedule (diff - odiff); |
| 534 |
/* no timer adjustment, as the monotonic clock doesn't jump */ |
| 535 |
} |
| 536 |
else |
| 537 |
{ |
| 538 |
if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP) |
| 539 |
{ |
| 540 |
periodics_reschedule (ev_now - now); |
| 541 |
|
| 542 |
/* adjust timers. this is easy, as the offset is the same for all */ |
| 543 |
for (i = 0; i < timercnt; ++i) |
| 544 |
timers [i]->at += diff; |
| 545 |
} |
| 546 |
|
| 547 |
now = ev_now; |
| 548 |
} |
| 549 |
} |
| 550 |
|
| 551 |
int ev_loop_done; |
| 552 |
|
| 553 |
void ev_loop (int flags) |
| 554 |
{ |
| 555 |
double block; |
| 556 |
ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0; |
| 557 |
|
| 558 |
if (checkcnt) |
| 559 |
{ |
| 560 |
queue_events ((W *)checks, checkcnt, EV_CHECK); |
| 561 |
call_pending (); |
| 562 |
} |
| 563 |
|
| 564 |
do |
| 565 |
{ |
| 566 |
/* update fd-related kernel structures */ |
| 567 |
fd_reify (); |
| 568 |
|
| 569 |
/* calculate blocking time */ |
| 570 |
|
| 571 |
/* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */ |
| 572 |
ev_now = ev_time (); |
| 573 |
|
| 574 |
if (flags & EVLOOP_NONBLOCK || idlecnt) |
| 575 |
block = 0.; |
| 576 |
else |
| 577 |
{ |
| 578 |
block = MAX_BLOCKTIME; |
| 579 |
|
| 580 |
if (timercnt) |
| 581 |
{ |
| 582 |
ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge; |
| 583 |
if (block > to) block = to; |
| 584 |
} |
| 585 |
|
| 586 |
if (periodiccnt) |
| 587 |
{ |
| 588 |
ev_tstamp to = periodics [0]->at - ev_now + method_fudge; |
| 589 |
if (block > to) block = to; |
| 590 |
} |
| 591 |
|
| 592 |
if (block < 0.) block = 0.; |
| 593 |
} |
| 594 |
|
| 595 |
method_poll (block); |
| 596 |
|
| 597 |
/* update ev_now, do magic */ |
| 598 |
time_update (); |
| 599 |
|
| 600 |
/* queue pending timers and reschedule them */ |
| 601 |
periodics_reify (); /* absolute timers first */ |
| 602 |
timers_reify (); /* relative timers second */ |
| 603 |
|
| 604 |
/* queue idle watchers unless io or timers are pending */ |
| 605 |
if (!pendingcnt) |
| 606 |
queue_events ((W *)idles, idlecnt, EV_IDLE); |
| 607 |
|
| 608 |
/* queue check and possibly idle watchers */ |
| 609 |
queue_events ((W *)checks, checkcnt, EV_CHECK); |
| 610 |
|
| 611 |
call_pending (); |
| 612 |
} |
| 613 |
while (!ev_loop_done); |
| 614 |
|
| 615 |
if (ev_loop_done != 2) |
| 616 |
ev_loop_done = 0; |
| 617 |
} |
| 618 |
|
| 619 |
/*****************************************************************************/ |
| 620 |
|
| 621 |
static void |
| 622 |
wlist_add (WL *head, WL elem) |
| 623 |
{ |
| 624 |
elem->next = *head; |
| 625 |
*head = elem; |
| 626 |
} |
| 627 |
|
| 628 |
static void |
| 629 |
wlist_del (WL *head, WL elem) |
| 630 |
{ |
| 631 |
while (*head) |
| 632 |
{ |
| 633 |
if (*head == elem) |
| 634 |
{ |
| 635 |
*head = elem->next; |
| 636 |
return; |
| 637 |
} |
| 638 |
|
| 639 |
head = &(*head)->next; |
| 640 |
} |
| 641 |
} |
| 642 |
|
| 643 |
static void |
| 644 |
ev_clear (W w) |
| 645 |
{ |
| 646 |
if (w->pending) |
| 647 |
{ |
| 648 |
pendings [w->pending - 1].w = 0; |
| 649 |
w->pending = 0; |
| 650 |
} |
| 651 |
} |
| 652 |
|
| 653 |
static void |
| 654 |
ev_start (W w, int active) |
| 655 |
{ |
| 656 |
w->active = active; |
| 657 |
} |
| 658 |
|
| 659 |
static void |
| 660 |
ev_stop (W w) |
| 661 |
{ |
| 662 |
w->active = 0; |
| 663 |
} |
| 664 |
|
| 665 |
/*****************************************************************************/ |
| 666 |
|
| 667 |
void |
| 668 |
evio_start (struct ev_io *w) |
| 669 |
{ |
| 670 |
if (ev_is_active (w)) |
| 671 |
return; |
| 672 |
|
| 673 |
int fd = w->fd; |
| 674 |
|
| 675 |
ev_start ((W)w, 1); |
| 676 |
array_needsize (anfds, anfdmax, fd + 1, anfds_init); |
| 677 |
wlist_add ((WL *)&anfds[fd].head, (WL)w); |
| 678 |
|
| 679 |
++fdchangecnt; |
| 680 |
array_needsize (fdchanges, fdchangemax, fdchangecnt, ); |
| 681 |
fdchanges [fdchangecnt - 1] = fd; |
| 682 |
} |
| 683 |
|
| 684 |
void |
| 685 |
evio_stop (struct ev_io *w) |
| 686 |
{ |
| 687 |
ev_clear ((W)w); |
| 688 |
if (!ev_is_active (w)) |
| 689 |
return; |
| 690 |
|
| 691 |
wlist_del ((WL *)&anfds[w->fd].head, (WL)w); |
| 692 |
ev_stop ((W)w); |
| 693 |
|
| 694 |
++fdchangecnt; |
| 695 |
array_needsize (fdchanges, fdchangemax, fdchangecnt, ); |
| 696 |
fdchanges [fdchangecnt - 1] = w->fd; |
| 697 |
} |
| 698 |
|
| 699 |
void |
| 700 |
evtimer_start (struct ev_timer *w) |
| 701 |
{ |
| 702 |
if (ev_is_active (w)) |
| 703 |
return; |
| 704 |
|
| 705 |
w->at += now; |
| 706 |
|
| 707 |
assert (("timer repeat value less than zero not allowed", w->repeat >= 0.)); |
| 708 |
|
| 709 |
ev_start ((W)w, ++timercnt); |
| 710 |
array_needsize (timers, timermax, timercnt, ); |
| 711 |
timers [timercnt - 1] = w; |
| 712 |
upheap ((WT *)timers, timercnt - 1); |
| 713 |
} |
| 714 |
|
| 715 |
void |
| 716 |
evtimer_stop (struct ev_timer *w) |
| 717 |
{ |
| 718 |
ev_clear ((W)w); |
| 719 |
if (!ev_is_active (w)) |
| 720 |
return; |
| 721 |
|
| 722 |
if (w->active < timercnt--) |
| 723 |
{ |
| 724 |
timers [w->active - 1] = timers [timercnt]; |
| 725 |
downheap ((WT *)timers, timercnt, w->active - 1); |
| 726 |
} |
| 727 |
|
| 728 |
w->at = w->repeat; |
| 729 |
|
| 730 |
ev_stop ((W)w); |
| 731 |
} |
| 732 |
|
| 733 |
void |
| 734 |
evtimer_again (struct ev_timer *w) |
| 735 |
{ |
| 736 |
if (ev_is_active (w)) |
| 737 |
{ |
| 738 |
if (w->repeat) |
| 739 |
{ |
| 740 |
w->at = now + w->repeat; |
| 741 |
downheap ((WT *)timers, timercnt, w->active - 1); |
| 742 |
} |
| 743 |
else |
| 744 |
evtimer_stop (w); |
| 745 |
} |
| 746 |
else if (w->repeat) |
| 747 |
evtimer_start (w); |
| 748 |
} |
| 749 |
|
| 750 |
void |
| 751 |
evperiodic_start (struct ev_periodic *w) |
| 752 |
{ |
| 753 |
if (ev_is_active (w)) |
| 754 |
return; |
| 755 |
|
| 756 |
assert (("periodic interval value less than zero not allowed", w->interval >= 0.)); |
| 757 |
|
| 758 |
/* this formula differs from the one in periodic_reify because we do not always round up */ |
| 759 |
if (w->interval) |
| 760 |
w->at += ceil ((ev_now - w->at) / w->interval) * w->interval; |
| 761 |
|
| 762 |
ev_start ((W)w, ++periodiccnt); |
| 763 |
array_needsize (periodics, periodicmax, periodiccnt, ); |
| 764 |
periodics [periodiccnt - 1] = w; |
| 765 |
upheap ((WT *)periodics, periodiccnt - 1); |
| 766 |
} |
| 767 |
|
| 768 |
void |
| 769 |
evperiodic_stop (struct ev_periodic *w) |
| 770 |
{ |
| 771 |
ev_clear ((W)w); |
| 772 |
if (!ev_is_active (w)) |
| 773 |
return; |
| 774 |
|
| 775 |
if (w->active < periodiccnt--) |
| 776 |
{ |
| 777 |
periodics [w->active - 1] = periodics [periodiccnt]; |
| 778 |
downheap ((WT *)periodics, periodiccnt, w->active - 1); |
| 779 |
} |
| 780 |
|
| 781 |
ev_stop ((W)w); |
| 782 |
} |
| 783 |
|
| 784 |
void |
| 785 |
evsignal_start (struct ev_signal *w) |
| 786 |
{ |
| 787 |
if (ev_is_active (w)) |
| 788 |
return; |
| 789 |
|
| 790 |
ev_start ((W)w, 1); |
| 791 |
array_needsize (signals, signalmax, w->signum, signals_init); |
| 792 |
wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w); |
| 793 |
|
| 794 |
if (!w->next) |
| 795 |
{ |
| 796 |
struct sigaction sa; |
| 797 |
sa.sa_handler = sighandler; |
| 798 |
sigfillset (&sa.sa_mask); |
| 799 |
sa.sa_flags = 0; |
| 800 |
sigaction (w->signum, &sa, 0); |
| 801 |
} |
| 802 |
} |
| 803 |
|
| 804 |
void |
| 805 |
evsignal_stop (struct ev_signal *w) |
| 806 |
{ |
| 807 |
ev_clear ((W)w); |
| 808 |
if (!ev_is_active (w)) |
| 809 |
return; |
| 810 |
|
| 811 |
wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w); |
| 812 |
ev_stop ((W)w); |
| 813 |
|
| 814 |
if (!signals [w->signum - 1].head) |
| 815 |
signal (w->signum, SIG_DFL); |
| 816 |
} |
| 817 |
|
| 818 |
void evidle_start (struct ev_idle *w) |
| 819 |
{ |
| 820 |
if (ev_is_active (w)) |
| 821 |
return; |
| 822 |
|
| 823 |
ev_start ((W)w, ++idlecnt); |
| 824 |
array_needsize (idles, idlemax, idlecnt, ); |
| 825 |
idles [idlecnt - 1] = w; |
| 826 |
} |
| 827 |
|
| 828 |
void evidle_stop (struct ev_idle *w) |
| 829 |
{ |
| 830 |
ev_clear ((W)w); |
| 831 |
if (ev_is_active (w)) |
| 832 |
return; |
| 833 |
|
| 834 |
idles [w->active - 1] = idles [--idlecnt]; |
| 835 |
ev_stop ((W)w); |
| 836 |
} |
| 837 |
|
| 838 |
void evcheck_start (struct ev_check *w) |
| 839 |
{ |
| 840 |
if (ev_is_active (w)) |
| 841 |
return; |
| 842 |
|
| 843 |
ev_start ((W)w, ++checkcnt); |
| 844 |
array_needsize (checks, checkmax, checkcnt, ); |
| 845 |
checks [checkcnt - 1] = w; |
| 846 |
} |
| 847 |
|
| 848 |
void evcheck_stop (struct ev_check *w) |
| 849 |
{ |
| 850 |
ev_clear ((W)w); |
| 851 |
if (ev_is_active (w)) |
| 852 |
return; |
| 853 |
|
| 854 |
checks [w->active - 1] = checks [--checkcnt]; |
| 855 |
ev_stop ((W)w); |
| 856 |
} |
| 857 |
|
| 858 |
/*****************************************************************************/ |
| 859 |
|
| 860 |
struct ev_once |
| 861 |
{ |
| 862 |
struct ev_io io; |
| 863 |
struct ev_timer to; |
| 864 |
void (*cb)(int revents, void *arg); |
| 865 |
void *arg; |
| 866 |
}; |
| 867 |
|
| 868 |
static void |
| 869 |
once_cb (struct ev_once *once, int revents) |
| 870 |
{ |
| 871 |
void (*cb)(int revents, void *arg) = once->cb; |
| 872 |
void *arg = once->arg; |
| 873 |
|
| 874 |
evio_stop (&once->io); |
| 875 |
evtimer_stop (&once->to); |
| 876 |
free (once); |
| 877 |
|
| 878 |
cb (revents, arg); |
| 879 |
} |
| 880 |
|
| 881 |
static void |
| 882 |
once_cb_io (struct ev_io *w, int revents) |
| 883 |
{ |
| 884 |
once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents); |
| 885 |
} |
| 886 |
|
| 887 |
static void |
| 888 |
once_cb_to (struct ev_timer *w, int revents) |
| 889 |
{ |
| 890 |
once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents); |
| 891 |
} |
| 892 |
|
| 893 |
void |
| 894 |
ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) |
| 895 |
{ |
| 896 |
struct ev_once *once = malloc (sizeof (struct ev_once)); |
| 897 |
|
| 898 |
if (!once) |
| 899 |
cb (EV_ERROR, arg); |
| 900 |
else |
| 901 |
{ |
| 902 |
once->cb = cb; |
| 903 |
once->arg = arg; |
| 904 |
|
| 905 |
evw_init (&once->io, once_cb_io); |
| 906 |
|
| 907 |
if (fd >= 0) |
| 908 |
{ |
| 909 |
evio_set (&once->io, fd, events); |
| 910 |
evio_start (&once->io); |
| 911 |
} |
| 912 |
|
| 913 |
evw_init (&once->to, once_cb_to); |
| 914 |
|
| 915 |
if (timeout >= 0.) |
| 916 |
{ |
| 917 |
evtimer_set (&once->to, timeout, 0.); |
| 918 |
evtimer_start (&once->to); |
| 919 |
} |
| 920 |
} |
| 921 |
} |
| 922 |
|
| 923 |
/*****************************************************************************/ |
| 924 |
|
| 925 |
#if 0 |
| 926 |
|
| 927 |
struct ev_io wio; |
| 928 |
|
| 929 |
static void |
| 930 |
sin_cb (struct ev_io *w, int revents) |
| 931 |
{ |
| 932 |
fprintf (stderr, "sin %d, revents %d\n", w->fd, revents); |
| 933 |
} |
| 934 |
|
| 935 |
static void |
| 936 |
ocb (struct ev_timer *w, int revents) |
| 937 |
{ |
| 938 |
//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data); |
| 939 |
evtimer_stop (w); |
| 940 |
evtimer_start (w); |
| 941 |
} |
| 942 |
|
| 943 |
static void |
| 944 |
scb (struct ev_signal *w, int revents) |
| 945 |
{ |
| 946 |
fprintf (stderr, "signal %x,%d\n", revents, w->signum); |
| 947 |
evio_stop (&wio); |
| 948 |
evio_start (&wio); |
| 949 |
} |
| 950 |
|
| 951 |
static void |
| 952 |
gcb (struct ev_signal *w, int revents) |
| 953 |
{ |
| 954 |
fprintf (stderr, "generic %x\n", revents); |
| 955 |
|
| 956 |
} |
| 957 |
|
| 958 |
int main (void) |
| 959 |
{ |
| 960 |
ev_init (0); |
| 961 |
|
| 962 |
evio_init (&wio, sin_cb, 0, EV_READ); |
| 963 |
evio_start (&wio); |
| 964 |
|
| 965 |
struct ev_timer t[10000]; |
| 966 |
|
| 967 |
#if 0 |
| 968 |
int i; |
| 969 |
for (i = 0; i < 10000; ++i) |
| 970 |
{ |
| 971 |
struct ev_timer *w = t + i; |
| 972 |
evw_init (w, ocb, i); |
| 973 |
evtimer_init_abs (w, ocb, drand48 (), 0.99775533); |
| 974 |
evtimer_start (w); |
| 975 |
if (drand48 () < 0.5) |
| 976 |
evtimer_stop (w); |
| 977 |
} |
| 978 |
#endif |
| 979 |
|
| 980 |
struct ev_timer t1; |
| 981 |
evtimer_init (&t1, ocb, 5, 10); |
| 982 |
evtimer_start (&t1); |
| 983 |
|
| 984 |
struct ev_signal sig; |
| 985 |
evsignal_init (&sig, scb, SIGQUIT); |
| 986 |
evsignal_start (&sig); |
| 987 |
|
| 988 |
struct ev_check cw; |
| 989 |
evcheck_init (&cw, gcb); |
| 990 |
evcheck_start (&cw); |
| 991 |
|
| 992 |
struct ev_idle iw; |
| 993 |
evidle_init (&iw, gcb); |
| 994 |
evidle_start (&iw); |
| 995 |
|
| 996 |
ev_loop (0); |
| 997 |
|
| 998 |
return 0; |
| 999 |
} |
| 1000 |
|
| 1001 |
#endif |
| 1002 |
|
| 1003 |
|
| 1004 |
|
| 1005 |
|
