… | |
… | |
64 | |
64 | |
65 | =head1 DESCRIPTION |
65 | =head1 DESCRIPTION |
66 | |
66 | |
67 | The newest version of this document is also available as an html-formatted |
67 | The newest version of this document is also available as an html-formatted |
68 | web page you might find easier to navigate when reading it for the first |
68 | web page you might find easier to navigate when reading it for the first |
69 | time: L<http://cvs.schmorp.de/libev/ev.html>. |
69 | time: L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod>. |
70 | |
70 | |
71 | Libev is an event loop: you register interest in certain events (such as a |
71 | Libev is an event loop: you register interest in certain events (such as a |
72 | file descriptor being readable or a timeout occurring), and it will manage |
72 | file descriptor being readable or a timeout occurring), and it will manage |
73 | these event sources and provide your program with events. |
73 | these event sources and provide your program with events. |
74 | |
74 | |
… | |
… | |
196 | See the description of C<ev_embed> watchers for more info. |
196 | See the description of C<ev_embed> watchers for more info. |
197 | |
197 | |
198 | =item ev_set_allocator (void *(*cb)(void *ptr, long size)) |
198 | =item ev_set_allocator (void *(*cb)(void *ptr, long size)) |
199 | |
199 | |
200 | Sets the allocation function to use (the prototype is similar - the |
200 | Sets the allocation function to use (the prototype is similar - the |
201 | semantics is identical - to the realloc C function). It is used to |
201 | semantics are identical to the C<realloc> C89/SuS/POSIX function). It is |
202 | allocate and free memory (no surprises here). If it returns zero when |
202 | used to allocate and free memory (no surprises here). If it returns zero |
203 | memory needs to be allocated, the library might abort or take some |
203 | when memory needs to be allocated (C<size != 0>), the library might abort |
204 | potentially destructive action. The default is your system realloc |
204 | or take some potentially destructive action. |
205 | function. |
205 | |
|
|
206 | Since some systems (at least OpenBSD and Darwin) fail to implement |
|
|
207 | correct C<realloc> semantics, libev will use a wrapper around the system |
|
|
208 | C<realloc> and C<free> functions by default. |
206 | |
209 | |
207 | You could override this function in high-availability programs to, say, |
210 | You could override this function in high-availability programs to, say, |
208 | free some memory if it cannot allocate memory, to use a special allocator, |
211 | free some memory if it cannot allocate memory, to use a special allocator, |
209 | or even to sleep a while and retry until some memory is available. |
212 | or even to sleep a while and retry until some memory is available. |
210 | |
213 | |
211 | Example: Replace the libev allocator with one that waits a bit and then |
214 | Example: Replace the libev allocator with one that waits a bit and then |
212 | retries). |
215 | retries (example requires a standards-compliant C<realloc>). |
213 | |
216 | |
214 | static void * |
217 | static void * |
215 | persistent_realloc (void *ptr, size_t size) |
218 | persistent_realloc (void *ptr, size_t size) |
216 | { |
219 | { |
217 | for (;;) |
220 | for (;;) |
… | |
… | |
333 | To get good performance out of this backend you need a high amount of |
336 | To get good performance out of this backend you need a high amount of |
334 | parallelity (most of the file descriptors should be busy). If you are |
337 | parallelity (most of the file descriptors should be busy). If you are |
335 | writing a server, you should C<accept ()> in a loop to accept as many |
338 | writing a server, you should C<accept ()> in a loop to accept as many |
336 | connections as possible during one iteration. You might also want to have |
339 | connections as possible during one iteration. You might also want to have |
337 | a look at C<ev_set_io_collect_interval ()> to increase the amount of |
340 | a look at C<ev_set_io_collect_interval ()> to increase the amount of |
338 | readyness notifications you get per iteration. |
341 | readiness notifications you get per iteration. |
339 | |
342 | |
340 | =item C<EVBACKEND_POLL> (value 2, poll backend, available everywhere except on windows) |
343 | =item C<EVBACKEND_POLL> (value 2, poll backend, available everywhere except on windows) |
341 | |
344 | |
342 | And this is your standard poll(2) backend. It's more complicated |
345 | And this is your standard poll(2) backend. It's more complicated |
343 | than select, but handles sparse fds better and has no artificial |
346 | than select, but handles sparse fds better and has no artificial |
… | |
… | |
422 | While this backend scales well, it requires one system call per active |
425 | While this backend scales well, it requires one system call per active |
423 | file descriptor per loop iteration. For small and medium numbers of file |
426 | file descriptor per loop iteration. For small and medium numbers of file |
424 | descriptors a "slow" C<EVBACKEND_SELECT> or C<EVBACKEND_POLL> backend |
427 | descriptors a "slow" C<EVBACKEND_SELECT> or C<EVBACKEND_POLL> backend |
425 | might perform better. |
428 | might perform better. |
426 | |
429 | |
427 | On the positive side, ignoring the spurious readyness notifications, this |
430 | On the positive side, ignoring the spurious readiness notifications, this |
428 | backend actually performed to specification in all tests and is fully |
431 | backend actually performed to specification in all tests and is fully |
429 | embeddable, which is a rare feat among the OS-specific backends. |
432 | embeddable, which is a rare feat among the OS-specific backends. |
430 | |
433 | |
431 | =item C<EVBACKEND_ALL> |
434 | =item C<EVBACKEND_ALL> |
432 | |
435 | |
… | |
… | |
1029 | If you must do this, then force the use of a known-to-be-good backend |
1032 | If you must do this, then force the use of a known-to-be-good backend |
1030 | (at the time of this writing, this includes only C<EVBACKEND_SELECT> and |
1033 | (at the time of this writing, this includes only C<EVBACKEND_SELECT> and |
1031 | C<EVBACKEND_POLL>). |
1034 | C<EVBACKEND_POLL>). |
1032 | |
1035 | |
1033 | Another thing you have to watch out for is that it is quite easy to |
1036 | Another thing you have to watch out for is that it is quite easy to |
1034 | receive "spurious" readyness notifications, that is your callback might |
1037 | receive "spurious" readiness notifications, that is your callback might |
1035 | be called with C<EV_READ> but a subsequent C<read>(2) will actually block |
1038 | be called with C<EV_READ> but a subsequent C<read>(2) will actually block |
1036 | because there is no data. Not only are some backends known to create a |
1039 | because there is no data. Not only are some backends known to create a |
1037 | lot of those (for example solaris ports), it is very easy to get into |
1040 | lot of those (for example solaris ports), it is very easy to get into |
1038 | this situation even with a relatively standard program structure. Thus |
1041 | this situation even with a relatively standard program structure. Thus |
1039 | it is best to always use non-blocking I/O: An extra C<read>(2) returning |
1042 | it is best to always use non-blocking I/O: An extra C<read>(2) returning |
… | |
… | |
1148 | |
1151 | |
1149 | Timer watchers are simple relative timers that generate an event after a |
1152 | Timer watchers are simple relative timers that generate an event after a |
1150 | given time, and optionally repeating in regular intervals after that. |
1153 | given time, and optionally repeating in regular intervals after that. |
1151 | |
1154 | |
1152 | The timers are based on real time, that is, if you register an event that |
1155 | The timers are based on real time, that is, if you register an event that |
1153 | times out after an hour and you reset your system clock to last years |
1156 | times out after an hour and you reset your system clock to january last |
1154 | time, it will still time out after (roughly) and hour. "Roughly" because |
1157 | year, it will still time out after (roughly) and hour. "Roughly" because |
1155 | detecting time jumps is hard, and some inaccuracies are unavoidable (the |
1158 | detecting time jumps is hard, and some inaccuracies are unavoidable (the |
1156 | monotonic clock option helps a lot here). |
1159 | monotonic clock option helps a lot here). |
1157 | |
1160 | |
1158 | The relative timeouts are calculated relative to the C<ev_now ()> |
1161 | The relative timeouts are calculated relative to the C<ev_now ()> |
1159 | time. This is usually the right thing as this timestamp refers to the time |
1162 | time. This is usually the right thing as this timestamp refers to the time |
… | |
… | |
1161 | you suspect event processing to be delayed and you I<need> to base the timeout |
1164 | you suspect event processing to be delayed and you I<need> to base the timeout |
1162 | on the current time, use something like this to adjust for this: |
1165 | on the current time, use something like this to adjust for this: |
1163 | |
1166 | |
1164 | ev_timer_set (&timer, after + ev_now () - ev_time (), 0.); |
1167 | ev_timer_set (&timer, after + ev_now () - ev_time (), 0.); |
1165 | |
1168 | |
1166 | The callback is guarenteed to be invoked only when its timeout has passed, |
1169 | The callback is guarenteed to be invoked only after its timeout has passed, |
1167 | but if multiple timers become ready during the same loop iteration then |
1170 | but if multiple timers become ready during the same loop iteration then |
1168 | order of execution is undefined. |
1171 | order of execution is undefined. |
1169 | |
1172 | |
1170 | =head3 Watcher-Specific Functions and Data Members |
1173 | =head3 Watcher-Specific Functions and Data Members |
1171 | |
1174 | |
… | |
… | |
1173 | |
1176 | |
1174 | =item ev_timer_init (ev_timer *, callback, ev_tstamp after, ev_tstamp repeat) |
1177 | =item ev_timer_init (ev_timer *, callback, ev_tstamp after, ev_tstamp repeat) |
1175 | |
1178 | |
1176 | =item ev_timer_set (ev_timer *, ev_tstamp after, ev_tstamp repeat) |
1179 | =item ev_timer_set (ev_timer *, ev_tstamp after, ev_tstamp repeat) |
1177 | |
1180 | |
1178 | Configure the timer to trigger after C<after> seconds. If C<repeat> is |
1181 | Configure the timer to trigger after C<after> seconds. If C<repeat> |
1179 | C<0.>, then it will automatically be stopped. If it is positive, then the |
1182 | is C<0.>, then it will automatically be stopped once the timeout is |
1180 | timer will automatically be configured to trigger again C<repeat> seconds |
1183 | reached. If it is positive, then the timer will automatically be |
1181 | later, again, and again, until stopped manually. |
1184 | configured to trigger again C<repeat> seconds later, again, and again, |
|
|
1185 | until stopped manually. |
1182 | |
1186 | |
1183 | The timer itself will do a best-effort at avoiding drift, that is, if you |
1187 | The timer itself will do a best-effort at avoiding drift, that is, if |
1184 | configure a timer to trigger every 10 seconds, then it will trigger at |
1188 | you configure a timer to trigger every 10 seconds, then it will normally |
1185 | exactly 10 second intervals. If, however, your program cannot keep up with |
1189 | trigger at exactly 10 second intervals. If, however, your program cannot |
1186 | the timer (because it takes longer than those 10 seconds to do stuff) the |
1190 | keep up with the timer (because it takes longer than those 10 seconds to |
1187 | timer will not fire more than once per event loop iteration. |
1191 | do stuff) the timer will not fire more than once per event loop iteration. |
1188 | |
1192 | |
1189 | =item ev_timer_again (loop, ev_timer *) |
1193 | =item ev_timer_again (loop, ev_timer *) |
1190 | |
1194 | |
1191 | This will act as if the timer timed out and restart it again if it is |
1195 | This will act as if the timer timed out and restart it again if it is |
1192 | repeating. The exact semantics are: |
1196 | repeating. The exact semantics are: |
… | |
… | |
1269 | Periodic watchers are also timers of a kind, but they are very versatile |
1273 | Periodic watchers are also timers of a kind, but they are very versatile |
1270 | (and unfortunately a bit complex). |
1274 | (and unfortunately a bit complex). |
1271 | |
1275 | |
1272 | Unlike C<ev_timer>'s, they are not based on real time (or relative time) |
1276 | Unlike C<ev_timer>'s, they are not based on real time (or relative time) |
1273 | but on wallclock time (absolute time). You can tell a periodic watcher |
1277 | but on wallclock time (absolute time). You can tell a periodic watcher |
1274 | to trigger "at" some specific point in time. For example, if you tell a |
1278 | to trigger after some specific point in time. For example, if you tell a |
1275 | periodic watcher to trigger in 10 seconds (by specifiying e.g. C<ev_now () |
1279 | periodic watcher to trigger in 10 seconds (by specifiying e.g. C<ev_now () |
1276 | + 10.>) and then reset your system clock to the last year, then it will |
1280 | + 10.>, that is, an absolute time not a delay) and then reset your system |
|
|
1281 | clock to january of the previous year, then it will take more than year |
1277 | take a year to trigger the event (unlike an C<ev_timer>, which would trigger |
1282 | to trigger the event (unlike an C<ev_timer>, which would still trigger |
1278 | roughly 10 seconds later). |
1283 | roughly 10 seconds later as it uses a relative timeout). |
1279 | |
1284 | |
1280 | They can also be used to implement vastly more complex timers, such as |
1285 | C<ev_periodic>s can also be used to implement vastly more complex timers, |
1281 | triggering an event on each midnight, local time or other, complicated, |
1286 | such as triggering an event on each "midnight, local time", or other |
1282 | rules. |
1287 | complicated, rules. |
1283 | |
1288 | |
1284 | As with timers, the callback is guarenteed to be invoked only when the |
1289 | As with timers, the callback is guarenteed to be invoked only when the |
1285 | time (C<at>) has been passed, but if multiple periodic timers become ready |
1290 | time (C<at>) has passed, but if multiple periodic timers become ready |
1286 | during the same loop iteration then order of execution is undefined. |
1291 | during the same loop iteration then order of execution is undefined. |
1287 | |
1292 | |
1288 | =head3 Watcher-Specific Functions and Data Members |
1293 | =head3 Watcher-Specific Functions and Data Members |
1289 | |
1294 | |
1290 | =over 4 |
1295 | =over 4 |
… | |
… | |
1298 | |
1303 | |
1299 | =over 4 |
1304 | =over 4 |
1300 | |
1305 | |
1301 | =item * absolute timer (at = time, interval = reschedule_cb = 0) |
1306 | =item * absolute timer (at = time, interval = reschedule_cb = 0) |
1302 | |
1307 | |
1303 | In this configuration the watcher triggers an event at the wallclock time |
1308 | In this configuration the watcher triggers an event after the wallclock |
1304 | C<at> and doesn't repeat. It will not adjust when a time jump occurs, |
1309 | time C<at> has passed and doesn't repeat. It will not adjust when a time |
1305 | that is, if it is to be run at January 1st 2011 then it will run when the |
1310 | jump occurs, that is, if it is to be run at January 1st 2011 then it will |
1306 | system time reaches or surpasses this time. |
1311 | run when the system time reaches or surpasses this time. |
1307 | |
1312 | |
1308 | =item * repeating interval timer (at = offset, interval > 0, reschedule_cb = 0) |
1313 | =item * repeating interval timer (at = offset, interval > 0, reschedule_cb = 0) |
1309 | |
1314 | |
1310 | In this mode the watcher will always be scheduled to time out at the next |
1315 | In this mode the watcher will always be scheduled to time out at the next |
1311 | C<at + N * interval> time (for some integer N, which can also be negative) |
1316 | C<at + N * interval> time (for some integer N, which can also be negative) |
1312 | and then repeat, regardless of any time jumps. |
1317 | and then repeat, regardless of any time jumps. |
1313 | |
1318 | |
1314 | This can be used to create timers that do not drift with respect to system |
1319 | This can be used to create timers that do not drift with respect to system |
1315 | time: |
1320 | time, for example, here is a C<ev_periodic> that triggers each hour, on |
|
|
1321 | the hour: |
1316 | |
1322 | |
1317 | ev_periodic_set (&periodic, 0., 3600., 0); |
1323 | ev_periodic_set (&periodic, 0., 3600., 0); |
1318 | |
1324 | |
1319 | This doesn't mean there will always be 3600 seconds in between triggers, |
1325 | This doesn't mean there will always be 3600 seconds in between triggers, |
1320 | but only that the the callback will be called when the system time shows a |
1326 | but only that the the callback will be called when the system time shows a |
… | |
… | |
1325 | C<ev_periodic> will try to run the callback in this mode at the next possible |
1331 | C<ev_periodic> will try to run the callback in this mode at the next possible |
1326 | time where C<time = at (mod interval)>, regardless of any time jumps. |
1332 | time where C<time = at (mod interval)>, regardless of any time jumps. |
1327 | |
1333 | |
1328 | For numerical stability it is preferable that the C<at> value is near |
1334 | For numerical stability it is preferable that the C<at> value is near |
1329 | C<ev_now ()> (the current time), but there is no range requirement for |
1335 | C<ev_now ()> (the current time), but there is no range requirement for |
1330 | this value. |
1336 | this value, and in fact is often specified as zero. |
|
|
1337 | |
|
|
1338 | Note also that there is an upper limit to how often a timer can fire (cpu |
|
|
1339 | speed for example), so if C<interval> is very small then timing stability |
|
|
1340 | will of course detoriate. Libev itself tries to be exact to be about one |
|
|
1341 | millisecond (if the OS supports it and the machine is fast enough). |
1331 | |
1342 | |
1332 | =item * manual reschedule mode (at and interval ignored, reschedule_cb = callback) |
1343 | =item * manual reschedule mode (at and interval ignored, reschedule_cb = callback) |
1333 | |
1344 | |
1334 | In this mode the values for C<interval> and C<at> are both being |
1345 | In this mode the values for C<interval> and C<at> are both being |
1335 | ignored. Instead, each time the periodic watcher gets scheduled, the |
1346 | ignored. Instead, each time the periodic watcher gets scheduled, the |
1336 | reschedule callback will be called with the watcher as first, and the |
1347 | reschedule callback will be called with the watcher as first, and the |
1337 | current time as second argument. |
1348 | current time as second argument. |
1338 | |
1349 | |
1339 | NOTE: I<This callback MUST NOT stop or destroy any periodic watcher, |
1350 | NOTE: I<This callback MUST NOT stop or destroy any periodic watcher, |
1340 | ever, or make any event loop modifications>. If you need to stop it, |
1351 | ever, or make ANY event loop modifications whatsoever>. |
1341 | return C<now + 1e30> (or so, fudge fudge) and stop it afterwards (e.g. by |
|
|
1342 | starting an C<ev_prepare> watcher, which is legal). |
|
|
1343 | |
1352 | |
|
|
1353 | If you need to stop it, return C<now + 1e30> (or so, fudge fudge) and stop |
|
|
1354 | it afterwards (e.g. by starting an C<ev_prepare> watcher, which is the |
|
|
1355 | only event loop modification you are allowed to do). |
|
|
1356 | |
1344 | Its prototype is C<ev_tstamp (*reschedule_cb)(struct ev_periodic *w, |
1357 | The callback prototype is C<ev_tstamp (*reschedule_cb)(struct ev_periodic |
1345 | ev_tstamp now)>, e.g.: |
1358 | *w, ev_tstamp now)>, e.g.: |
1346 | |
1359 | |
1347 | static ev_tstamp my_rescheduler (struct ev_periodic *w, ev_tstamp now) |
1360 | static ev_tstamp my_rescheduler (struct ev_periodic *w, ev_tstamp now) |
1348 | { |
1361 | { |
1349 | return now + 60.; |
1362 | return now + 60.; |
1350 | } |
1363 | } |
… | |
… | |
1352 | It must return the next time to trigger, based on the passed time value |
1365 | It must return the next time to trigger, based on the passed time value |
1353 | (that is, the lowest time value larger than to the second argument). It |
1366 | (that is, the lowest time value larger than to the second argument). It |
1354 | will usually be called just before the callback will be triggered, but |
1367 | will usually be called just before the callback will be triggered, but |
1355 | might be called at other times, too. |
1368 | might be called at other times, too. |
1356 | |
1369 | |
1357 | NOTE: I<< This callback must always return a time that is later than the |
1370 | NOTE: I<< This callback must always return a time that is higher than or |
1358 | passed C<now> value >>. Not even C<now> itself will do, it I<must> be larger. |
1371 | equal to the passed C<now> value >>. |
1359 | |
1372 | |
1360 | This can be used to create very complex timers, such as a timer that |
1373 | This can be used to create very complex timers, such as a timer that |
1361 | triggers on each midnight, local time. To do this, you would calculate the |
1374 | triggers on "next midnight, local time". To do this, you would calculate the |
1362 | next midnight after C<now> and return the timestamp value for this. How |
1375 | next midnight after C<now> and return the timestamp value for this. How |
1363 | you do this is, again, up to you (but it is not trivial, which is the main |
1376 | you do this is, again, up to you (but it is not trivial, which is the main |
1364 | reason I omitted it as an example). |
1377 | reason I omitted it as an example). |
1365 | |
1378 | |
1366 | =back |
1379 | =back |
… | |
… | |
1370 | Simply stops and restarts the periodic watcher again. This is only useful |
1383 | Simply stops and restarts the periodic watcher again. This is only useful |
1371 | when you changed some parameters or the reschedule callback would return |
1384 | when you changed some parameters or the reschedule callback would return |
1372 | a different time than the last time it was called (e.g. in a crond like |
1385 | a different time than the last time it was called (e.g. in a crond like |
1373 | program when the crontabs have changed). |
1386 | program when the crontabs have changed). |
1374 | |
1387 | |
|
|
1388 | =item ev_tstamp ev_periodic_at (ev_periodic *) |
|
|
1389 | |
|
|
1390 | When active, returns the absolute time that the watcher is supposed to |
|
|
1391 | trigger next. |
|
|
1392 | |
1375 | =item ev_tstamp offset [read-write] |
1393 | =item ev_tstamp offset [read-write] |
1376 | |
1394 | |
1377 | When repeating, this contains the offset value, otherwise this is the |
1395 | When repeating, this contains the offset value, otherwise this is the |
1378 | absolute point in time (the C<at> value passed to C<ev_periodic_set>). |
1396 | absolute point in time (the C<at> value passed to C<ev_periodic_set>). |
1379 | |
1397 | |
… | |
… | |
1389 | =item ev_tstamp (*reschedule_cb)(struct ev_periodic *w, ev_tstamp now) [read-write] |
1407 | =item ev_tstamp (*reschedule_cb)(struct ev_periodic *w, ev_tstamp now) [read-write] |
1390 | |
1408 | |
1391 | The current reschedule callback, or C<0>, if this functionality is |
1409 | The current reschedule callback, or C<0>, if this functionality is |
1392 | switched off. Can be changed any time, but changes only take effect when |
1410 | switched off. Can be changed any time, but changes only take effect when |
1393 | the periodic timer fires or C<ev_periodic_again> is being called. |
1411 | the periodic timer fires or C<ev_periodic_again> is being called. |
1394 | |
|
|
1395 | =item ev_tstamp at [read-only] |
|
|
1396 | |
|
|
1397 | When active, contains the absolute time that the watcher is supposed to |
|
|
1398 | trigger next. |
|
|
1399 | |
1412 | |
1400 | =back |
1413 | =back |
1401 | |
1414 | |
1402 | =head3 Examples |
1415 | =head3 Examples |
1403 | |
1416 | |
… | |
… | |
1607 | as even with OS-supported change notifications, this can be |
1620 | as even with OS-supported change notifications, this can be |
1608 | resource-intensive. |
1621 | resource-intensive. |
1609 | |
1622 | |
1610 | At the time of this writing, only the Linux inotify interface is |
1623 | At the time of this writing, only the Linux inotify interface is |
1611 | implemented (implementing kqueue support is left as an exercise for the |
1624 | implemented (implementing kqueue support is left as an exercise for the |
|
|
1625 | reader, note, however, that the author sees no way of implementing ev_stat |
1612 | reader). Inotify will be used to give hints only and should not change the |
1626 | semantics with kqueue). Inotify will be used to give hints only and should |
1613 | semantics of C<ev_stat> watchers, which means that libev sometimes needs |
1627 | not change the semantics of C<ev_stat> watchers, which means that libev |
1614 | to fall back to regular polling again even with inotify, but changes are |
1628 | sometimes needs to fall back to regular polling again even with inotify, |
1615 | usually detected immediately, and if the file exists there will be no |
1629 | but changes are usually detected immediately, and if the file exists there |
1616 | polling. |
1630 | will be no polling. |
1617 | |
1631 | |
1618 | =head3 ABI Issues (Largefile Support) |
1632 | =head3 ABI Issues (Largefile Support) |
1619 | |
1633 | |
1620 | Libev by default (unless the user overrides this) uses the default |
1634 | Libev by default (unless the user overrides this) uses the default |
1621 | compilation environment, which means that on systems with optionally |
1635 | compilation environment, which means that on systems with optionally |
… | |
… | |
1631 | When C<inotify (7)> support has been compiled into libev (generally only |
1645 | When C<inotify (7)> support has been compiled into libev (generally only |
1632 | available on Linux) and present at runtime, it will be used to speed up |
1646 | available on Linux) and present at runtime, it will be used to speed up |
1633 | change detection where possible. The inotify descriptor will be created lazily |
1647 | change detection where possible. The inotify descriptor will be created lazily |
1634 | when the first C<ev_stat> watcher is being started. |
1648 | when the first C<ev_stat> watcher is being started. |
1635 | |
1649 | |
1636 | Inotify presense does not change the semantics of C<ev_stat> watchers |
1650 | Inotify presence does not change the semantics of C<ev_stat> watchers |
1637 | except that changes might be detected earlier, and in some cases, to avoid |
1651 | except that changes might be detected earlier, and in some cases, to avoid |
1638 | making regular C<stat> calls. Even in the presense of inotify support |
1652 | making regular C<stat> calls. Even in the presence of inotify support |
1639 | there are many cases where libev has to resort to regular C<stat> polling. |
1653 | there are many cases where libev has to resort to regular C<stat> polling. |
1640 | |
1654 | |
1641 | (There is no support for kqueue, as apparently it cannot be used to |
1655 | (There is no support for kqueue, as apparently it cannot be used to |
1642 | implement this functionality, due to the requirement of having a file |
1656 | implement this functionality, due to the requirement of having a file |
1643 | descriptor open on the object at all times). |
1657 | descriptor open on the object at all times). |
… | |
… | |
1646 | |
1660 | |
1647 | The C<stat ()> syscall only supports full-second resolution portably, and |
1661 | The C<stat ()> syscall only supports full-second resolution portably, and |
1648 | even on systems where the resolution is higher, many filesystems still |
1662 | even on systems where the resolution is higher, many filesystems still |
1649 | only support whole seconds. |
1663 | only support whole seconds. |
1650 | |
1664 | |
1651 | That means that, if the time is the only thing that changes, you might |
1665 | That means that, if the time is the only thing that changes, you can |
1652 | miss updates: on the first update, C<ev_stat> detects a change and calls |
1666 | easily miss updates: on the first update, C<ev_stat> detects a change and |
1653 | your callback, which does something. When there is another update within |
1667 | calls your callback, which does something. When there is another update |
1654 | the same second, C<ev_stat> will be unable to detect it. |
1668 | within the same second, C<ev_stat> will be unable to detect it as the stat |
|
|
1669 | data does not change. |
1655 | |
1670 | |
1656 | The solution to this is to delay acting on a change for a second (or till |
1671 | The solution to this is to delay acting on a change for slightly more |
1657 | the next second boundary), using a roughly one-second delay C<ev_timer> |
1672 | than a second (or till slightly after the next full second boundary), using |
1658 | (C<ev_timer_set (w, 0., 1.01); ev_timer_again (loop, w)>). The C<.01> |
1673 | a roughly one-second-delay C<ev_timer> (e.g. C<ev_timer_set (w, 0., 1.02); |
1659 | is added to work around small timing inconsistencies of some operating |
1674 | ev_timer_again (loop, w)>). |
1660 | systems. |
1675 | |
|
|
1676 | The C<.02> offset is added to work around small timing inconsistencies |
|
|
1677 | of some operating systems (where the second counter of the current time |
|
|
1678 | might be be delayed. One such system is the Linux kernel, where a call to |
|
|
1679 | C<gettimeofday> might return a timestamp with a full second later than |
|
|
1680 | a subsequent C<time> call - if the equivalent of C<time ()> is used to |
|
|
1681 | update file times then there will be a small window where the kernel uses |
|
|
1682 | the previous second to update file times but libev might already execute |
|
|
1683 | the timer callback). |
1661 | |
1684 | |
1662 | =head3 Watcher-Specific Functions and Data Members |
1685 | =head3 Watcher-Specific Functions and Data Members |
1663 | |
1686 | |
1664 | =over 4 |
1687 | =over 4 |
1665 | |
1688 | |
… | |
… | |
1671 | C<path>. The C<interval> is a hint on how quickly a change is expected to |
1694 | C<path>. The C<interval> is a hint on how quickly a change is expected to |
1672 | be detected and should normally be specified as C<0> to let libev choose |
1695 | be detected and should normally be specified as C<0> to let libev choose |
1673 | a suitable value. The memory pointed to by C<path> must point to the same |
1696 | a suitable value. The memory pointed to by C<path> must point to the same |
1674 | path for as long as the watcher is active. |
1697 | path for as long as the watcher is active. |
1675 | |
1698 | |
1676 | The callback will be receive C<EV_STAT> when a change was detected, |
1699 | The callback will receive C<EV_STAT> when a change was detected, relative |
1677 | relative to the attributes at the time the watcher was started (or the |
1700 | to the attributes at the time the watcher was started (or the last change |
1678 | last change was detected). |
1701 | was detected). |
1679 | |
1702 | |
1680 | =item ev_stat_stat (loop, ev_stat *) |
1703 | =item ev_stat_stat (loop, ev_stat *) |
1681 | |
1704 | |
1682 | Updates the stat buffer immediately with new values. If you change the |
1705 | Updates the stat buffer immediately with new values. If you change the |
1683 | watched path in your callback, you could call this fucntion to avoid |
1706 | watched path in your callback, you could call this function to avoid |
1684 | detecting this change (while introducing a race condition). Can also be |
1707 | detecting this change (while introducing a race condition if you are not |
1685 | useful simply to find out the new values. |
1708 | the only one changing the path). Can also be useful simply to find out the |
|
|
1709 | new values. |
1686 | |
1710 | |
1687 | =item ev_statdata attr [read-only] |
1711 | =item ev_statdata attr [read-only] |
1688 | |
1712 | |
1689 | The most-recently detected attributes of the file. Although the type is of |
1713 | The most-recently detected attributes of the file. Although the type is |
1690 | C<ev_statdata>, this is usually the (or one of the) C<struct stat> types |
1714 | C<ev_statdata>, this is usually the (or one of the) C<struct stat> types |
1691 | suitable for your system. If the C<st_nlink> member is C<0>, then there |
1715 | suitable for your system, but you can only rely on the POSIX-standardised |
|
|
1716 | members to be present. If the C<st_nlink> member is C<0>, then there was |
1692 | was some error while C<stat>ing the file. |
1717 | some error while C<stat>ing the file. |
1693 | |
1718 | |
1694 | =item ev_statdata prev [read-only] |
1719 | =item ev_statdata prev [read-only] |
1695 | |
1720 | |
1696 | The previous attributes of the file. The callback gets invoked whenever |
1721 | The previous attributes of the file. The callback gets invoked whenever |
1697 | C<prev> != C<attr>. |
1722 | C<prev> != C<attr>, or, more precisely, one or more of these members |
|
|
1723 | differ: C<st_dev>, C<st_ino>, C<st_mode>, C<st_nlink>, C<st_uid>, |
|
|
1724 | C<st_gid>, C<st_rdev>, C<st_size>, C<st_atime>, C<st_mtime>, C<st_ctime>. |
1698 | |
1725 | |
1699 | =item ev_tstamp interval [read-only] |
1726 | =item ev_tstamp interval [read-only] |
1700 | |
1727 | |
1701 | The specified interval. |
1728 | The specified interval. |
1702 | |
1729 | |
… | |
… | |
1756 | } |
1783 | } |
1757 | |
1784 | |
1758 | ... |
1785 | ... |
1759 | ev_stat_init (&passwd, stat_cb, "/etc/passwd", 0.); |
1786 | ev_stat_init (&passwd, stat_cb, "/etc/passwd", 0.); |
1760 | ev_stat_start (loop, &passwd); |
1787 | ev_stat_start (loop, &passwd); |
1761 | ev_timer_init (&timer, timer_cb, 0., 1.01); |
1788 | ev_timer_init (&timer, timer_cb, 0., 1.02); |
1762 | |
1789 | |
1763 | |
1790 | |
1764 | =head2 C<ev_idle> - when you've got nothing better to do... |
1791 | =head2 C<ev_idle> - when you've got nothing better to do... |
1765 | |
1792 | |
1766 | Idle watchers trigger events when no other events of the same or higher |
1793 | Idle watchers trigger events when no other events of the same or higher |
… | |
… | |
1854 | |
1881 | |
1855 | It is recommended to give C<ev_check> watchers highest (C<EV_MAXPRI>) |
1882 | It is recommended to give C<ev_check> watchers highest (C<EV_MAXPRI>) |
1856 | priority, to ensure that they are being run before any other watchers |
1883 | priority, to ensure that they are being run before any other watchers |
1857 | after the poll. Also, C<ev_check> watchers (and C<ev_prepare> watchers, |
1884 | after the poll. Also, C<ev_check> watchers (and C<ev_prepare> watchers, |
1858 | too) should not activate ("feed") events into libev. While libev fully |
1885 | too) should not activate ("feed") events into libev. While libev fully |
1859 | supports this, they will be called before other C<ev_check> watchers |
1886 | supports this, they might get executed before other C<ev_check> watchers |
1860 | did their job. As C<ev_check> watchers are often used to embed other |
1887 | did their job. As C<ev_check> watchers are often used to embed other |
1861 | (non-libev) event loops those other event loops might be in an unusable |
1888 | (non-libev) event loops those other event loops might be in an unusable |
1862 | state until their C<ev_check> watcher ran (always remind yourself to |
1889 | state until their C<ev_check> watcher ran (always remind yourself to |
1863 | coexist peacefully with others). |
1890 | coexist peacefully with others). |
1864 | |
1891 | |
… | |
… | |
1879 | =head3 Examples |
1906 | =head3 Examples |
1880 | |
1907 | |
1881 | There are a number of principal ways to embed other event loops or modules |
1908 | There are a number of principal ways to embed other event loops or modules |
1882 | into libev. Here are some ideas on how to include libadns into libev |
1909 | into libev. Here are some ideas on how to include libadns into libev |
1883 | (there is a Perl module named C<EV::ADNS> that does this, which you could |
1910 | (there is a Perl module named C<EV::ADNS> that does this, which you could |
1884 | use for an actually working example. Another Perl module named C<EV::Glib> |
1911 | use as a working example. Another Perl module named C<EV::Glib> embeds a |
1885 | embeds a Glib main context into libev, and finally, C<Glib::EV> embeds EV |
1912 | Glib main context into libev, and finally, C<Glib::EV> embeds EV into the |
1886 | into the Glib event loop). |
1913 | Glib event loop). |
1887 | |
1914 | |
1888 | Method 1: Add IO watchers and a timeout watcher in a prepare handler, |
1915 | Method 1: Add IO watchers and a timeout watcher in a prepare handler, |
1889 | and in a check watcher, destroy them and call into libadns. What follows |
1916 | and in a check watcher, destroy them and call into libadns. What follows |
1890 | is pseudo-code only of course. This requires you to either use a low |
1917 | is pseudo-code only of course. This requires you to either use a low |
1891 | priority for the check watcher or use C<ev_clear_pending> explicitly, as |
1918 | priority for the check watcher or use C<ev_clear_pending> explicitly, as |
… | |
… | |
2375 | |
2402 | |
2376 | =item * Priorities are not currently supported. Initialising priorities |
2403 | =item * Priorities are not currently supported. Initialising priorities |
2377 | will fail and all watchers will have the same priority, even though there |
2404 | will fail and all watchers will have the same priority, even though there |
2378 | is an ev_pri field. |
2405 | is an ev_pri field. |
2379 | |
2406 | |
|
|
2407 | =item * In libevent, the last base created gets the signals, in libev, the |
|
|
2408 | first base created (== the default loop) gets the signals. |
|
|
2409 | |
2380 | =item * Other members are not supported. |
2410 | =item * Other members are not supported. |
2381 | |
2411 | |
2382 | =item * The libev emulation is I<not> ABI compatible to libevent, you need |
2412 | =item * The libev emulation is I<not> ABI compatible to libevent, you need |
2383 | to use the libev header file and library. |
2413 | to use the libev header file and library. |
2384 | |
2414 | |
… | |
… | |
2960 | defined to be C<0>, then they are not. |
2990 | defined to be C<0>, then they are not. |
2961 | |
2991 | |
2962 | =item EV_MINIMAL |
2992 | =item EV_MINIMAL |
2963 | |
2993 | |
2964 | If you need to shave off some kilobytes of code at the expense of some |
2994 | If you need to shave off some kilobytes of code at the expense of some |
2965 | speed, define this symbol to C<1>. Currently only used for gcc to override |
2995 | speed, define this symbol to C<1>. Currently this is used to override some |
2966 | some inlining decisions, saves roughly 30% codesize of amd64. |
2996 | inlining decisions, saves roughly 30% codesize of amd64. It also selects a |
|
|
2997 | much smaller 2-heap for timer management over the default 4-heap. |
2967 | |
2998 | |
2968 | =item EV_PID_HASHSIZE |
2999 | =item EV_PID_HASHSIZE |
2969 | |
3000 | |
2970 | C<ev_child> watchers use a small hash table to distribute workload by |
3001 | C<ev_child> watchers use a small hash table to distribute workload by |
2971 | pid. The default size is C<16> (or C<1> with C<EV_MINIMAL>), usually more |
3002 | pid. The default size is C<16> (or C<1> with C<EV_MINIMAL>), usually more |
… | |
… | |
2977 | C<ev_stat> watchers use a small hash table to distribute workload by |
3008 | C<ev_stat> watchers use a small hash table to distribute workload by |
2978 | inotify watch id. The default size is C<16> (or C<1> with C<EV_MINIMAL>), |
3009 | inotify watch id. The default size is C<16> (or C<1> with C<EV_MINIMAL>), |
2979 | usually more than enough. If you need to manage thousands of C<ev_stat> |
3010 | usually more than enough. If you need to manage thousands of C<ev_stat> |
2980 | watchers you might want to increase this value (I<must> be a power of |
3011 | watchers you might want to increase this value (I<must> be a power of |
2981 | two). |
3012 | two). |
|
|
3013 | |
|
|
3014 | =item EV_USE_4HEAP |
|
|
3015 | |
|
|
3016 | Heaps are not very cache-efficient. To improve the cache-efficiency of the |
|
|
3017 | timer and periodics heap, libev uses a 4-heap when this symbol is defined |
|
|
3018 | to C<1>. The 4-heap uses more complicated (longer) code but has |
|
|
3019 | noticably faster performance with many (thousands) of watchers. |
|
|
3020 | |
|
|
3021 | The default is C<1> unless C<EV_MINIMAL> is set in which case it is C<0> |
|
|
3022 | (disabled). |
|
|
3023 | |
|
|
3024 | =item EV_HEAP_CACHE_AT |
|
|
3025 | |
|
|
3026 | Heaps are not very cache-efficient. To improve the cache-efficiency of the |
|
|
3027 | timer and periodics heap, libev can cache the timestamp (I<at>) within |
|
|
3028 | the heap structure (selected by defining C<EV_HEAP_CACHE_AT> to C<1>), |
|
|
3029 | which uses 8-12 bytes more per watcher and a few hundred bytes more code, |
|
|
3030 | but avoids random read accesses on heap changes. This improves performance |
|
|
3031 | noticably with with many (hundreds) of watchers. |
|
|
3032 | |
|
|
3033 | The default is C<1> unless C<EV_MINIMAL> is set in which case it is C<0> |
|
|
3034 | (disabled). |
2982 | |
3035 | |
2983 | =item EV_COMMON |
3036 | =item EV_COMMON |
2984 | |
3037 | |
2985 | By default, all watchers have a C<void *data> member. By redefining |
3038 | By default, all watchers have a C<void *data> member. By redefining |
2986 | this macro to a something else you can include more and other types of |
3039 | this macro to a something else you can include more and other types of |
… | |
… | |
3156 | correct watcher to remove. The lists are usually short (you don't usually |
3209 | correct watcher to remove. The lists are usually short (you don't usually |
3157 | have many watchers waiting for the same fd or signal). |
3210 | have many watchers waiting for the same fd or signal). |
3158 | |
3211 | |
3159 | =item Finding the next timer in each loop iteration: O(1) |
3212 | =item Finding the next timer in each loop iteration: O(1) |
3160 | |
3213 | |
3161 | By virtue of using a binary heap, the next timer is always found at the |
3214 | By virtue of using a binary or 4-heap, the next timer is always found at a |
3162 | beginning of the storage array. |
3215 | fixed position in the storage array. |
3163 | |
3216 | |
3164 | =item Each change on a file descriptor per loop iteration: O(number_of_watchers_for_this_fd) |
3217 | =item Each change on a file descriptor per loop iteration: O(number_of_watchers_for_this_fd) |
3165 | |
3218 | |
3166 | A change means an I/O watcher gets started or stopped, which requires |
3219 | A change means an I/O watcher gets started or stopped, which requires |
3167 | libev to recalculate its status (and possibly tell the kernel, depending |
3220 | libev to recalculate its status (and possibly tell the kernel, depending |
… | |
… | |
3196 | model. Libev still offers limited functionality on this platform in |
3249 | model. Libev still offers limited functionality on this platform in |
3197 | the form of the C<EVBACKEND_SELECT> backend, and only supports socket |
3250 | the form of the C<EVBACKEND_SELECT> backend, and only supports socket |
3198 | descriptors. This only applies when using Win32 natively, not when using |
3251 | descriptors. This only applies when using Win32 natively, not when using |
3199 | e.g. cygwin. |
3252 | e.g. cygwin. |
3200 | |
3253 | |
|
|
3254 | Lifting these limitations would basically require the full |
|
|
3255 | re-implementation of the I/O system. If you are into these kinds of |
|
|
3256 | things, then note that glib does exactly that for you in a very portable |
|
|
3257 | way (note also that glib is the slowest event library known to man). |
|
|
3258 | |
3201 | There is no supported compilation method available on windows except |
3259 | There is no supported compilation method available on windows except |
3202 | embedding it into other applications. |
3260 | embedding it into other applications. |
3203 | |
3261 | |
3204 | Due to the many, low, and arbitrary limits on the win32 platform and the |
3262 | Due to the many, low, and arbitrary limits on the win32 platform and |
3205 | abysmal performance of winsockets, using a large number of sockets is not |
3263 | the abysmal performance of winsockets, using a large number of sockets |
3206 | recommended (and not reasonable). If your program needs to use more than |
3264 | is not recommended (and not reasonable). If your program needs to use |
3207 | a hundred or so sockets, then likely it needs to use a totally different |
3265 | more than a hundred or so sockets, then likely it needs to use a totally |
3208 | implementation for windows, as libev offers the POSIX model, which cannot |
3266 | different implementation for windows, as libev offers the POSIX readiness |
3209 | be implemented efficiently on windows (microsoft monopoly games). |
3267 | notification model, which cannot be implemented efficiently on windows |
|
|
3268 | (microsoft monopoly games). |
3210 | |
3269 | |
3211 | =over 4 |
3270 | =over 4 |
3212 | |
3271 | |
3213 | =item The winsocket select function |
3272 | =item The winsocket select function |
3214 | |
3273 | |
… | |
… | |
3228 | Note that winsockets handling of fd sets is O(n), so you can easily get a |
3287 | Note that winsockets handling of fd sets is O(n), so you can easily get a |
3229 | complexity in the O(n²) range when using win32. |
3288 | complexity in the O(n²) range when using win32. |
3230 | |
3289 | |
3231 | =item Limited number of file descriptors |
3290 | =item Limited number of file descriptors |
3232 | |
3291 | |
3233 | Windows has numerous arbitrary (and low) limits on things. Early versions |
3292 | Windows has numerous arbitrary (and low) limits on things. |
3234 | of winsocket's select only supported waiting for a max. of C<64> handles |
3293 | |
|
|
3294 | Early versions of winsocket's select only supported waiting for a maximum |
3235 | (probably owning to the fact that all windows kernels can only wait for |
3295 | of C<64> handles (probably owning to the fact that all windows kernels |
3236 | C<64> things at the same time internally; microsoft recommends spawning a |
3296 | can only wait for C<64> things at the same time internally; microsoft |
3237 | chain of threads and wait for 63 handles and the previous thread in each). |
3297 | recommends spawning a chain of threads and wait for 63 handles and the |
|
|
3298 | previous thread in each. Great). |
3238 | |
3299 | |
3239 | Newer versions support more handles, but you need to define C<FD_SETSIZE> |
3300 | Newer versions support more handles, but you need to define C<FD_SETSIZE> |
3240 | to some high number (e.g. C<2048>) before compiling the winsocket select |
3301 | to some high number (e.g. C<2048>) before compiling the winsocket select |
3241 | call (which might be in libev or elsewhere, for example, perl does its own |
3302 | call (which might be in libev or elsewhere, for example, perl does its own |
3242 | select emulation on windows). |
3303 | select emulation on windows). |
… | |
… | |
3254 | calling select (O(n²)) will likely make this unworkable. |
3315 | calling select (O(n²)) will likely make this unworkable. |
3255 | |
3316 | |
3256 | =back |
3317 | =back |
3257 | |
3318 | |
3258 | |
3319 | |
|
|
3320 | =head1 PORTABILITY REQUIREMENTS |
|
|
3321 | |
|
|
3322 | In addition to a working ISO-C implementation, libev relies on a few |
|
|
3323 | additional extensions: |
|
|
3324 | |
|
|
3325 | =over 4 |
|
|
3326 | |
|
|
3327 | =item C<sig_atomic_t volatile> must be thread-atomic as well |
|
|
3328 | |
|
|
3329 | The type C<sig_atomic_t volatile> (or whatever is defined as |
|
|
3330 | C<EV_ATOMIC_T>) must be atomic w.r.t. accesses from different |
|
|
3331 | threads. This is not part of the specification for C<sig_atomic_t>, but is |
|
|
3332 | believed to be sufficiently portable. |
|
|
3333 | |
|
|
3334 | =item C<sigprocmask> must work in a threaded environment |
|
|
3335 | |
|
|
3336 | Libev uses C<sigprocmask> to temporarily block signals. This is not |
|
|
3337 | allowed in a threaded program (C<pthread_sigmask> has to be used). Typical |
|
|
3338 | pthread implementations will either allow C<sigprocmask> in the "main |
|
|
3339 | thread" or will block signals process-wide, both behaviours would |
|
|
3340 | be compatible with libev. Interaction between C<sigprocmask> and |
|
|
3341 | C<pthread_sigmask> could complicate things, however. |
|
|
3342 | |
|
|
3343 | The most portable way to handle signals is to block signals in all threads |
|
|
3344 | except the initial one, and run the default loop in the initial thread as |
|
|
3345 | well. |
|
|
3346 | |
|
|
3347 | =item C<long> must be large enough for common memory allocation sizes |
|
|
3348 | |
|
|
3349 | To improve portability and simplify using libev, libev uses C<long> |
|
|
3350 | internally instead of C<size_t> when allocating its data structures. On |
|
|
3351 | non-POSIX systems (Microsoft...) this might be unexpectedly low, but |
|
|
3352 | is still at least 31 bits everywhere, which is enough for hundreds of |
|
|
3353 | millions of watchers. |
|
|
3354 | |
|
|
3355 | =item C<double> must hold a time value in seconds with enough accuracy |
|
|
3356 | |
|
|
3357 | The type C<double> is used to represent timestamps. It is required to |
|
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3358 | have at least 51 bits of mantissa (and 9 bits of exponent), which is good |
|
|
3359 | enough for at least into the year 4000. This requirement is fulfilled by |
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3360 | implementations implementing IEEE 754 (basically all existing ones). |
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3361 | |
|
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3362 | =back |
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3363 | |
|
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3364 | If you know of other additional requirements drop me a note. |
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3365 | |
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3366 | |
|
|
3367 | =head1 VALGRIND |
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3368 | |
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3369 | Valgrind has a special section here because it is a popular tool that is |
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3370 | highly useful, but valgrind reports are very hard to interpret. |
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3371 | |
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3372 | If you think you found a bug (memory leak, uninitialised data access etc.) |
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3373 | in libev, then check twice: If valgrind reports something like: |
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3374 | |
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3375 | ==2274== definitely lost: 0 bytes in 0 blocks. |
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3376 | ==2274== possibly lost: 0 bytes in 0 blocks. |
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3377 | ==2274== still reachable: 256 bytes in 1 blocks. |
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3378 | |
|
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3379 | then there is no memory leak. Similarly, under some circumstances, |
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3380 | valgrind might report kernel bugs as if it were a bug in libev, or it |
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3381 | might be confused (it is a very good tool, but only a tool). |
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3382 | |
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3383 | If you are unsure about something, feel free to contact the mailing list |
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3384 | with the full valgrind report and an explanation on why you think this is |
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3385 | a bug in libev. However, don't be annoyed when you get a brisk "this is |
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3386 | no bug" answer and take the chance of learning how to interpret valgrind |
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3387 | properly. |
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3388 | |
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3389 | If you need, for some reason, empty reports from valgrind for your project |
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3390 | I suggest using suppression lists. |
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3391 | |
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3392 | |
3259 | =head1 AUTHOR |
3393 | =head1 AUTHOR |
3260 | |
3394 | |
3261 | Marc Lehmann <libev@schmorp.de>. |
3395 | Marc Lehmann <libev@schmorp.de>. |
3262 | |
3396 | |