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Revision 1.67 by root, Fri Dec 7 16:44:12 2007 UTC

63details of the event, and then hand it over to libev by I<starting> the 63details of the event, and then hand it over to libev by I<starting> the
64watcher. 64watcher.
65 65
66=head1 FEATURES 66=head1 FEATURES
67 67
68Libev supports C<select>, C<poll>, the linux-specific C<epoll>, the 68Libev supports C<select>, C<poll>, the Linux-specific C<epoll>, the
69bsd-specific C<kqueue> and the solaris-specific event port mechanisms 69BSD-specific C<kqueue> and the Solaris-specific event port mechanisms
70for file descriptor events (C<ev_io>), relative timers (C<ev_timer>), 70for file descriptor events (C<ev_io>), the Linux C<inotify> interface
71(for C<ev_stat>), relative timers (C<ev_timer>), absolute timers
71absolute timers with customised rescheduling (C<ev_periodic>), synchronous 72with customised rescheduling (C<ev_periodic>), synchronous signals
72signals (C<ev_signal>), process status change events (C<ev_child>), and 73(C<ev_signal>), process status change events (C<ev_child>), and event
73event watchers dealing with the event loop mechanism itself (C<ev_idle>, 74watchers dealing with the event loop mechanism itself (C<ev_idle>,
74C<ev_embed>, C<ev_prepare> and C<ev_check> watchers) as well as 75C<ev_embed>, C<ev_prepare> and C<ev_check> watchers) as well as
75file watchers (C<ev_stat>) and even limited support for fork events 76file watchers (C<ev_stat>) and even limited support for fork events
76(C<ev_fork>). 77(C<ev_fork>).
77 78
78It also is quite fast (see this 79It also is quite fast (see this
162C<ev_embeddable_backends () & ev_supported_backends ()>, likewise for 163C<ev_embeddable_backends () & ev_supported_backends ()>, likewise for
163recommended ones. 164recommended ones.
164 165
165See the description of C<ev_embed> watchers for more info. 166See the description of C<ev_embed> watchers for more info.
166 167
167=item ev_set_allocator (void *(*cb)(void *ptr, size_t size)) 168=item ev_set_allocator (void *(*cb)(void *ptr, long size))
168 169
169Sets the allocation function to use (the prototype and semantics are 170Sets the allocation function to use (the prototype is similar - the
170identical to the realloc C function). It is used to allocate and free 171semantics is identical - to the realloc C function). It is used to
171memory (no surprises here). If it returns zero when memory needs to be 172allocate and free memory (no surprises here). If it returns zero when
172allocated, the library might abort or take some potentially destructive 173memory needs to be allocated, the library might abort or take some
173action. The default is your system realloc function. 174potentially destructive action. The default is your system realloc
175function.
174 176
175You could override this function in high-availability programs to, say, 177You could override this function in high-availability programs to, say,
176free some memory if it cannot allocate memory, to use a special allocator, 178free some memory if it cannot allocate memory, to use a special allocator,
177or even to sleep a while and retry until some memory is available. 179or even to sleep a while and retry until some memory is available.
178 180
264C<LIBEV_FLAGS>. Otherwise (the default), this environment variable will 266C<LIBEV_FLAGS>. Otherwise (the default), this environment variable will
265override the flags completely if it is found in the environment. This is 267override the flags completely if it is found in the environment. This is
266useful to try out specific backends to test their performance, or to work 268useful to try out specific backends to test their performance, or to work
267around bugs. 269around bugs.
268 270
271=item C<EVFLAG_FORKCHECK>
272
273Instead of calling C<ev_default_fork> or C<ev_loop_fork> manually after
274a fork, you can also make libev check for a fork in each iteration by
275enabling this flag.
276
277This works by calling C<getpid ()> on every iteration of the loop,
278and thus this might slow down your event loop if you do a lot of loop
279iterations and little real work, but is usually not noticeable (on my
280Linux system for example, C<getpid> is actually a simple 5-insn sequence
281without a syscall and thus I<very> fast, but my Linux system also has
282C<pthread_atfork> which is even faster).
283
284The big advantage of this flag is that you can forget about fork (and
285forget about forgetting to tell libev about forking) when you use this
286flag.
287
288This flag setting cannot be overriden or specified in the C<LIBEV_FLAGS>
289environment variable.
290
269=item C<EVBACKEND_SELECT> (value 1, portable select backend) 291=item C<EVBACKEND_SELECT> (value 1, portable select backend)
270 292
271This is your standard select(2) backend. Not I<completely> standard, as 293This is your standard select(2) backend. Not I<completely> standard, as
272libev tries to roll its own fd_set with no limits on the number of fds, 294libev tries to roll its own fd_set with no limits on the number of fds,
273but if that fails, expect a fairly low limit on the number of fds when 295but if that fails, expect a fairly low limit on the number of fds when
407=item ev_loop_fork (loop) 429=item ev_loop_fork (loop)
408 430
409Like C<ev_default_fork>, but acts on an event loop created by 431Like C<ev_default_fork>, but acts on an event loop created by
410C<ev_loop_new>. Yes, you have to call this on every allocated event loop 432C<ev_loop_new>. Yes, you have to call this on every allocated event loop
411after fork, and how you do this is entirely your own problem. 433after fork, and how you do this is entirely your own problem.
434
435=item unsigned int ev_loop_count (loop)
436
437Returns the count of loop iterations for the loop, which is identical to
438the number of times libev did poll for new events. It starts at C<0> and
439happily wraps around with enough iterations.
440
441This value can sometimes be useful as a generation counter of sorts (it
442"ticks" the number of loop iterations), as it roughly corresponds with
443C<ev_prepare> and C<ev_check> calls.
412 444
413=item unsigned int ev_backend (loop) 445=item unsigned int ev_backend (loop)
414 446
415Returns one of the C<EVBACKEND_*> flags indicating the event backend in 447Returns one of the C<EVBACKEND_*> flags indicating the event backend in
416use. 448use.
703events but its callback has not yet been invoked). As long as a watcher 735events but its callback has not yet been invoked). As long as a watcher
704is pending (but not active) you must not call an init function on it (but 736is pending (but not active) you must not call an init function on it (but
705C<ev_TYPE_set> is safe) and you must make sure the watcher is available to 737C<ev_TYPE_set> is safe) and you must make sure the watcher is available to
706libev (e.g. you cnanot C<free ()> it). 738libev (e.g. you cnanot C<free ()> it).
707 739
708=item callback = ev_cb (ev_TYPE *watcher) 740=item callback ev_cb (ev_TYPE *watcher)
709 741
710Returns the callback currently set on the watcher. 742Returns the callback currently set on the watcher.
711 743
712=item ev_cb_set (ev_TYPE *watcher, callback) 744=item ev_cb_set (ev_TYPE *watcher, callback)
713 745
714Change the callback. You can change the callback at virtually any time 746Change the callback. You can change the callback at virtually any time
715(modulo threads). 747(modulo threads).
748
749=item ev_set_priority (ev_TYPE *watcher, priority)
750
751=item int ev_priority (ev_TYPE *watcher)
752
753Set and query the priority of the watcher. The priority is a small
754integer between C<EV_MAXPRI> (default: C<2>) and C<EV_MINPRI>
755(default: C<-2>). Pending watchers with higher priority will be invoked
756before watchers with lower priority, but priority will not keep watchers
757from being executed (except for C<ev_idle> watchers).
758
759This means that priorities are I<only> used for ordering callback
760invocation after new events have been received. This is useful, for
761example, to reduce latency after idling, or more often, to bind two
762watchers on the same event and make sure one is called first.
763
764If you need to suppress invocation when higher priority events are pending
765you need to look at C<ev_idle> watchers, which provide this functionality.
766
767The default priority used by watchers when no priority has been set is
768always C<0>, which is supposed to not be too high and not be too low :).
769
770Setting a priority outside the range of C<EV_MINPRI> to C<EV_MAXPRI> is
771fine, as long as you do not mind that the priority value you query might
772or might not have been adjusted to be within valid range.
716 773
717=back 774=back
718 775
719 776
720=head2 ASSOCIATING CUSTOM DATA WITH A WATCHER 777=head2 ASSOCIATING CUSTOM DATA WITH A WATCHER
741 { 798 {
742 struct my_io *w = (struct my_io *)w_; 799 struct my_io *w = (struct my_io *)w_;
743 ... 800 ...
744 } 801 }
745 802
746More interesting and less C-conformant ways of catsing your callback type 803More interesting and less C-conformant ways of casting your callback type
747have been omitted.... 804instead have been omitted.
805
806Another common scenario is having some data structure with multiple
807watchers:
808
809 struct my_biggy
810 {
811 int some_data;
812 ev_timer t1;
813 ev_timer t2;
814 }
815
816In this case getting the pointer to C<my_biggy> is a bit more complicated,
817you need to use C<offsetof>:
818
819 #include <stddef.h>
820
821 static void
822 t1_cb (EV_P_ struct ev_timer *w, int revents)
823 {
824 struct my_biggy big = (struct my_biggy *
825 (((char *)w) - offsetof (struct my_biggy, t1));
826 }
827
828 static void
829 t2_cb (EV_P_ struct ev_timer *w, int revents)
830 {
831 struct my_biggy big = (struct my_biggy *
832 (((char *)w) - offsetof (struct my_biggy, t2));
833 }
748 834
749 835
750=head1 WATCHER TYPES 836=head1 WATCHER TYPES
751 837
752This section describes each watcher in detail, but will not repeat 838This section describes each watcher in detail, but will not repeat
885=item ev_timer_again (loop) 971=item ev_timer_again (loop)
886 972
887This will act as if the timer timed out and restart it again if it is 973This will act as if the timer timed out and restart it again if it is
888repeating. The exact semantics are: 974repeating. The exact semantics are:
889 975
976If the timer is pending, its pending status is cleared.
977
890If the timer is started but nonrepeating, stop it. 978If the timer is started but nonrepeating, stop it (as if it timed out).
891 979
892If the timer is repeating, either start it if necessary (with the repeat 980If the timer is repeating, either start it if necessary (with the
893value), or reset the running timer to the repeat value. 981C<repeat> value), or reset the running timer to the C<repeat> value.
894 982
895This sounds a bit complicated, but here is a useful and typical 983This sounds a bit complicated, but here is a useful and typical
896example: Imagine you have a tcp connection and you want a so-called 984example: Imagine you have a tcp connection and you want a so-called idle
897idle timeout, that is, you want to be called when there have been, 985timeout, that is, you want to be called when there have been, say, 60
898say, 60 seconds of inactivity on the socket. The easiest way to do 986seconds of inactivity on the socket. The easiest way to do this is to
899this is to configure an C<ev_timer> with C<after>=C<repeat>=C<60> and calling 987configure an C<ev_timer> with a C<repeat> value of C<60> and then call
900C<ev_timer_again> each time you successfully read or write some data. If 988C<ev_timer_again> each time you successfully read or write some data. If
901you go into an idle state where you do not expect data to travel on the 989you go into an idle state where you do not expect data to travel on the
902socket, you can stop the timer, and again will automatically restart it if 990socket, you can C<ev_timer_stop> the timer, and C<ev_timer_again> will
903need be. 991automatically restart it if need be.
904 992
905You can also ignore the C<after> value and C<ev_timer_start> altogether 993That means you can ignore the C<after> value and C<ev_timer_start>
906and only ever use the C<repeat> value: 994altogether and only ever use the C<repeat> value and C<ev_timer_again>:
907 995
908 ev_timer_init (timer, callback, 0., 5.); 996 ev_timer_init (timer, callback, 0., 5.);
909 ev_timer_again (loop, timer); 997 ev_timer_again (loop, timer);
910 ... 998 ...
911 timer->again = 17.; 999 timer->again = 17.;
912 ev_timer_again (loop, timer); 1000 ev_timer_again (loop, timer);
913 ... 1001 ...
914 timer->again = 10.; 1002 timer->again = 10.;
915 ev_timer_again (loop, timer); 1003 ev_timer_again (loop, timer);
916 1004
917This is more efficient then stopping/starting the timer eahc time you want 1005This is more slightly efficient then stopping/starting the timer each time
918to modify its timeout value. 1006you want to modify its timeout value.
919 1007
920=item ev_tstamp repeat [read-write] 1008=item ev_tstamp repeat [read-write]
921 1009
922The current C<repeat> value. Will be used each time the watcher times out 1010The current C<repeat> value. Will be used each time the watcher times out
923or C<ev_timer_again> is called and determines the next timeout (if any), 1011or C<ev_timer_again> is called and determines the next timeout (if any),
1192not exist" is a status change like any other. The condition "path does 1280not exist" is a status change like any other. The condition "path does
1193not exist" is signified by the C<st_nlink> field being zero (which is 1281not exist" is signified by the C<st_nlink> field being zero (which is
1194otherwise always forced to be at least one) and all the other fields of 1282otherwise always forced to be at least one) and all the other fields of
1195the stat buffer having unspecified contents. 1283the stat buffer having unspecified contents.
1196 1284
1285The path I<should> be absolute and I<must not> end in a slash. If it is
1286relative and your working directory changes, the behaviour is undefined.
1287
1197Since there is no standard to do this, the portable implementation simply 1288Since there is no standard to do this, the portable implementation simply
1198calls C<stat (2)> regulalry on the path to see if it changed somehow. You 1289calls C<stat (2)> regularly on the path to see if it changed somehow. You
1199can specify a recommended polling interval for this case. If you specify 1290can specify a recommended polling interval for this case. If you specify
1200a polling interval of C<0> (highly recommended!) then a I<suitable, 1291a polling interval of C<0> (highly recommended!) then a I<suitable,
1201unspecified default> value will be used (which you can expect to be around 1292unspecified default> value will be used (which you can expect to be around
1202five seconds, although this might change dynamically). Libev will also 1293five seconds, although this might change dynamically). Libev will also
1203impose a minimum interval which is currently around C<0.1>, but thats 1294impose a minimum interval which is currently around C<0.1>, but thats
1205 1296
1206This watcher type is not meant for massive numbers of stat watchers, 1297This watcher type is not meant for massive numbers of stat watchers,
1207as even with OS-supported change notifications, this can be 1298as even with OS-supported change notifications, this can be
1208resource-intensive. 1299resource-intensive.
1209 1300
1210At the time of this writing, no specific OS backends are implemented, but 1301At the time of this writing, only the Linux inotify interface is
1211if demand increases, at least a kqueue and inotify backend will be added. 1302implemented (implementing kqueue support is left as an exercise for the
1303reader). Inotify will be used to give hints only and should not change the
1304semantics of C<ev_stat> watchers, which means that libev sometimes needs
1305to fall back to regular polling again even with inotify, but changes are
1306usually detected immediately, and if the file exists there will be no
1307polling.
1212 1308
1213=over 4 1309=over 4
1214 1310
1215=item ev_stat_init (ev_stat *, callback, const char *path, ev_tstamp interval) 1311=item ev_stat_init (ev_stat *, callback, const char *path, ev_tstamp interval)
1216 1312
1280 ev_stat_start (loop, &passwd); 1376 ev_stat_start (loop, &passwd);
1281 1377
1282 1378
1283=head2 C<ev_idle> - when you've got nothing better to do... 1379=head2 C<ev_idle> - when you've got nothing better to do...
1284 1380
1285Idle watchers trigger events when there are no other events are pending 1381Idle watchers trigger events when no other events of the same or higher
1286(prepare, check and other idle watchers do not count). That is, as long 1382priority are pending (prepare, check and other idle watchers do not
1287as your process is busy handling sockets or timeouts (or even signals, 1383count).
1288imagine) it will not be triggered. But when your process is idle all idle 1384
1289watchers are being called again and again, once per event loop iteration - 1385That is, as long as your process is busy handling sockets or timeouts
1386(or even signals, imagine) of the same or higher priority it will not be
1387triggered. But when your process is idle (or only lower-priority watchers
1388are pending), the idle watchers are being called once per event loop
1290until stopped, that is, or your process receives more events and becomes 1389iteration - until stopped, that is, or your process receives more events
1291busy. 1390and becomes busy again with higher priority stuff.
1292 1391
1293The most noteworthy effect is that as long as any idle watchers are 1392The most noteworthy effect is that as long as any idle watchers are
1294active, the process will not block when waiting for new events. 1393active, the process will not block when waiting for new events.
1295 1394
1296Apart from keeping your process non-blocking (which is a useful 1395Apart from keeping your process non-blocking (which is a useful
1396 1495
1397 // create io watchers for each fd and a timer before blocking 1496 // create io watchers for each fd and a timer before blocking
1398 static void 1497 static void
1399 adns_prepare_cb (ev_loop *loop, ev_prepare *w, int revents) 1498 adns_prepare_cb (ev_loop *loop, ev_prepare *w, int revents)
1400 { 1499 {
1401 int timeout = 3600000;truct pollfd fds [nfd]; 1500 int timeout = 3600000;
1501 struct pollfd fds [nfd];
1402 // actual code will need to loop here and realloc etc. 1502 // actual code will need to loop here and realloc etc.
1403 adns_beforepoll (ads, fds, &nfd, &timeout, timeval_from (ev_time ())); 1503 adns_beforepoll (ads, fds, &nfd, &timeout, timeval_from (ev_time ()));
1404 1504
1405 /* the callback is illegal, but won't be called as we stop during check */ 1505 /* the callback is illegal, but won't be called as we stop during check */
1406 ev_timer_init (&tw, 0, timeout * 1e-3); 1506 ev_timer_init (&tw, 0, timeout * 1e-3);
1787Similar to the other two macros, this gives you the value of the default 1887Similar to the other two macros, this gives you the value of the default
1788loop, if multiple loops are supported ("ev loop default"). 1888loop, if multiple loops are supported ("ev loop default").
1789 1889
1790=back 1890=back
1791 1891
1792Example: Declare and initialise a check watcher, working regardless of 1892Example: Declare and initialise a check watcher, utilising the above
1793wether multiple loops are supported or not. 1893macros so it will work regardless of wether multiple loops are supported
1894or not.
1794 1895
1795 static void 1896 static void
1796 check_cb (EV_P_ ev_timer *w, int revents) 1897 check_cb (EV_P_ ev_timer *w, int revents)
1797 { 1898 {
1798 ev_check_stop (EV_A_ w); 1899 ev_check_stop (EV_A_ w);
1800 1901
1801 ev_check check; 1902 ev_check check;
1802 ev_check_init (&check, check_cb); 1903 ev_check_init (&check, check_cb);
1803 ev_check_start (EV_DEFAULT_ &check); 1904 ev_check_start (EV_DEFAULT_ &check);
1804 ev_loop (EV_DEFAULT_ 0); 1905 ev_loop (EV_DEFAULT_ 0);
1805
1806 1906
1807=head1 EMBEDDING 1907=head1 EMBEDDING
1808 1908
1809Libev can (and often is) directly embedded into host 1909Libev can (and often is) directly embedded into host
1810applications. Examples of applications that embed it include the Deliantra 1910applications. Examples of applications that embed it include the Deliantra
1850 ev_vars.h 1950 ev_vars.h
1851 ev_wrap.h 1951 ev_wrap.h
1852 1952
1853 ev_win32.c required on win32 platforms only 1953 ev_win32.c required on win32 platforms only
1854 1954
1855 ev_select.c only when select backend is enabled (which is by default) 1955 ev_select.c only when select backend is enabled (which is enabled by default)
1856 ev_poll.c only when poll backend is enabled (disabled by default) 1956 ev_poll.c only when poll backend is enabled (disabled by default)
1857 ev_epoll.c only when the epoll backend is enabled (disabled by default) 1957 ev_epoll.c only when the epoll backend is enabled (disabled by default)
1858 ev_kqueue.c only when the kqueue backend is enabled (disabled by default) 1958 ev_kqueue.c only when the kqueue backend is enabled (disabled by default)
1859 ev_port.c only when the solaris port backend is enabled (disabled by default) 1959 ev_port.c only when the solaris port backend is enabled (disabled by default)
1860 1960
1985 2085
1986=item EV_USE_DEVPOLL 2086=item EV_USE_DEVPOLL
1987 2087
1988reserved for future expansion, works like the USE symbols above. 2088reserved for future expansion, works like the USE symbols above.
1989 2089
2090=item EV_USE_INOTIFY
2091
2092If defined to be C<1>, libev will compile in support for the Linux inotify
2093interface to speed up C<ev_stat> watchers. Its actual availability will
2094be detected at runtime.
2095
1990=item EV_H 2096=item EV_H
1991 2097
1992The name of the F<ev.h> header file used to include it. The default if 2098The name of the F<ev.h> header file used to include it. The default if
1993undefined is C<< <ev.h> >> in F<event.h> and C<"ev.h"> in F<ev.c>. This 2099undefined is C<< <ev.h> >> in F<event.h> and C<"ev.h"> in F<ev.c>. This
1994can be used to virtually rename the F<ev.h> header file in case of conflicts. 2100can be used to virtually rename the F<ev.h> header file in case of conflicts.
2023 2129
2024If undefined or defined to be C<1>, then periodic timers are supported. If 2130If undefined or defined to be C<1>, then periodic timers are supported. If
2025defined to be C<0>, then they are not. Disabling them saves a few kB of 2131defined to be C<0>, then they are not. Disabling them saves a few kB of
2026code. 2132code.
2027 2133
2134=item EV_IDLE_ENABLE
2135
2136If undefined or defined to be C<1>, then idle watchers are supported. If
2137defined to be C<0>, then they are not. Disabling them saves a few kB of
2138code.
2139
2028=item EV_EMBED_ENABLE 2140=item EV_EMBED_ENABLE
2029 2141
2030If undefined or defined to be C<1>, then embed watchers are supported. If 2142If undefined or defined to be C<1>, then embed watchers are supported. If
2031defined to be C<0>, then they are not. 2143defined to be C<0>, then they are not.
2032 2144
2049=item EV_PID_HASHSIZE 2161=item EV_PID_HASHSIZE
2050 2162
2051C<ev_child> watchers use a small hash table to distribute workload by 2163C<ev_child> watchers use a small hash table to distribute workload by
2052pid. The default size is C<16> (or C<1> with C<EV_MINIMAL>), usually more 2164pid. The default size is C<16> (or C<1> with C<EV_MINIMAL>), usually more
2053than enough. If you need to manage thousands of children you might want to 2165than enough. If you need to manage thousands of children you might want to
2054increase this value. 2166increase this value (I<must> be a power of two).
2167
2168=item EV_INOTIFY_HASHSIZE
2169
2170C<ev_staz> watchers use a small hash table to distribute workload by
2171inotify watch id. The default size is C<16> (or C<1> with C<EV_MINIMAL>),
2172usually more than enough. If you need to manage thousands of C<ev_stat>
2173watchers you might want to increase this value (I<must> be a power of
2174two).
2055 2175
2056=item EV_COMMON 2176=item EV_COMMON
2057 2177
2058By default, all watchers have a C<void *data> member. By redefining 2178By default, all watchers have a C<void *data> member. By redefining
2059this macro to a something else you can include more and other types of 2179this macro to a something else you can include more and other types of
2088interface) and F<EV.xs> (implementation) files. Only the F<EV.xs> file 2208interface) and F<EV.xs> (implementation) files. Only the F<EV.xs> file
2089will be compiled. It is pretty complex because it provides its own header 2209will be compiled. It is pretty complex because it provides its own header
2090file. 2210file.
2091 2211
2092The usage in rxvt-unicode is simpler. It has a F<ev_cpp.h> header file 2212The usage in rxvt-unicode is simpler. It has a F<ev_cpp.h> header file
2093that everybody includes and which overrides some autoconf choices: 2213that everybody includes and which overrides some configure choices:
2094 2214
2215 #define EV_MINIMAL 1
2095 #define EV_USE_POLL 0 2216 #define EV_USE_POLL 0
2096 #define EV_MULTIPLICITY 0 2217 #define EV_MULTIPLICITY 0
2097 #define EV_PERIODICS 0 2218 #define EV_PERIODIC_ENABLE 0
2219 #define EV_STAT_ENABLE 0
2220 #define EV_FORK_ENABLE 0
2098 #define EV_CONFIG_H <config.h> 2221 #define EV_CONFIG_H <config.h>
2222 #define EV_MINPRI 0
2223 #define EV_MAXPRI 0
2099 2224
2100 #include "ev++.h" 2225 #include "ev++.h"
2101 2226
2102And a F<ev_cpp.C> implementation file that contains libev proper and is compiled: 2227And a F<ev_cpp.C> implementation file that contains libev proper and is compiled:
2103 2228
2119 2244
2120=item Starting io/check/prepare/idle/signal/child watchers: O(1) 2245=item Starting io/check/prepare/idle/signal/child watchers: O(1)
2121 2246
2122=item Stopping check/prepare/idle watchers: O(1) 2247=item Stopping check/prepare/idle watchers: O(1)
2123 2248
2124=item Stopping an io/signal/child watcher: O(number_of_watchers_for_this_(fd/signal/pid % 16)) 2249=item Stopping an io/signal/child watcher: O(number_of_watchers_for_this_(fd/signal/pid % EV_PID_HASHSIZE))
2125 2250
2126=item Finding the next timer per loop iteration: O(1) 2251=item Finding the next timer per loop iteration: O(1)
2127 2252
2128=item Each change on a file descriptor per loop iteration: O(number_of_watchers_for_this_fd) 2253=item Each change on a file descriptor per loop iteration: O(number_of_watchers_for_this_fd)
2129 2254

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