… | |
… | |
370 | When this flag is specified, then libev will not attempt to use the |
370 | When this flag is specified, then libev will not attempt to use the |
371 | I<inotify> API for it's C<ev_stat> watchers. Apart from debugging and |
371 | I<inotify> API for it's C<ev_stat> watchers. Apart from debugging and |
372 | testing, this flag can be useful to conserve inotify file descriptors, as |
372 | testing, this flag can be useful to conserve inotify file descriptors, as |
373 | otherwise each loop using C<ev_stat> watchers consumes one inotify handle. |
373 | otherwise each loop using C<ev_stat> watchers consumes one inotify handle. |
374 | |
374 | |
375 | =item C<EVFLAG_NOSIGNALFD> |
375 | =item C<EVFLAG_NOSIGFD> |
376 | |
376 | |
377 | When this flag is specified, then libev will not attempt to use the |
377 | When this flag is specified, then libev will not attempt to use the |
378 | I<signalfd> API for it's C<ev_signal> (and C<ev_child>) watchers. This is |
378 | I<signalfd> API for it's C<ev_signal> (and C<ev_child>) watchers. This is |
379 | probably only useful to work around any bugs in libev. Consequently, this |
379 | probably only useful to work around any bugs in libev. Consequently, this |
380 | flag might go away once the signalfd functionality is considered stable, |
380 | flag might go away once the signalfd functionality is considered stable, |
… | |
… | |
410 | |
410 | |
411 | This backend maps C<EV_READ> to C<POLLIN | POLLERR | POLLHUP>, and |
411 | This backend maps C<EV_READ> to C<POLLIN | POLLERR | POLLHUP>, and |
412 | C<EV_WRITE> to C<POLLOUT | POLLERR | POLLHUP>. |
412 | C<EV_WRITE> to C<POLLOUT | POLLERR | POLLHUP>. |
413 | |
413 | |
414 | =item C<EVBACKEND_EPOLL> (value 4, Linux) |
414 | =item C<EVBACKEND_EPOLL> (value 4, Linux) |
|
|
415 | |
|
|
416 | Use the linux-specific epoll(7) interface (for both pre- and post-2.6.9 |
|
|
417 | kernels). |
415 | |
418 | |
416 | For few fds, this backend is a bit little slower than poll and select, |
419 | For few fds, this backend is a bit little slower than poll and select, |
417 | but it scales phenomenally better. While poll and select usually scale |
420 | but it scales phenomenally better. While poll and select usually scale |
418 | like O(total_fds) where n is the total number of fds (or the highest fd), |
421 | like O(total_fds) where n is the total number of fds (or the highest fd), |
419 | epoll scales either O(1) or O(active_fds). |
422 | epoll scales either O(1) or O(active_fds). |
… | |
… | |
590 | as signal and child watchers) would need to be stopped manually. |
593 | as signal and child watchers) would need to be stopped manually. |
591 | |
594 | |
592 | In general it is not advisable to call this function except in the |
595 | In general it is not advisable to call this function except in the |
593 | rare occasion where you really need to free e.g. the signal handling |
596 | rare occasion where you really need to free e.g. the signal handling |
594 | pipe fds. If you need dynamically allocated loops it is better to use |
597 | pipe fds. If you need dynamically allocated loops it is better to use |
595 | C<ev_loop_new> and C<ev_loop_destroy>). |
598 | C<ev_loop_new> and C<ev_loop_destroy>. |
596 | |
599 | |
597 | =item ev_loop_destroy (loop) |
600 | =item ev_loop_destroy (loop) |
598 | |
601 | |
599 | Like C<ev_default_destroy>, but destroys an event loop created by an |
602 | Like C<ev_default_destroy>, but destroys an event loop created by an |
600 | earlier call to C<ev_loop_new>. |
603 | earlier call to C<ev_loop_new>. |
… | |
… | |
704 | event loop time (see C<ev_now_update>). |
707 | event loop time (see C<ev_now_update>). |
705 | |
708 | |
706 | =item ev_loop (loop, int flags) |
709 | =item ev_loop (loop, int flags) |
707 | |
710 | |
708 | Finally, this is it, the event handler. This function usually is called |
711 | Finally, this is it, the event handler. This function usually is called |
709 | after you initialised all your watchers and you want to start handling |
712 | after you have initialised all your watchers and you want to start |
710 | events. |
713 | handling events. |
711 | |
714 | |
712 | If the flags argument is specified as C<0>, it will not return until |
715 | If the flags argument is specified as C<0>, it will not return until |
713 | either no event watchers are active anymore or C<ev_unloop> was called. |
716 | either no event watchers are active anymore or C<ev_unloop> was called. |
714 | |
717 | |
715 | Please note that an explicit C<ev_unloop> is usually better than |
718 | Please note that an explicit C<ev_unloop> is usually better than |
… | |
… | |
1233 | watcher isn't pending it does nothing and returns C<0>. |
1236 | watcher isn't pending it does nothing and returns C<0>. |
1234 | |
1237 | |
1235 | Sometimes it can be useful to "poll" a watcher instead of waiting for its |
1238 | Sometimes it can be useful to "poll" a watcher instead of waiting for its |
1236 | callback to be invoked, which can be accomplished with this function. |
1239 | callback to be invoked, which can be accomplished with this function. |
1237 | |
1240 | |
|
|
1241 | =item ev_feed_event (struct ev_loop *, watcher *, int revents) |
|
|
1242 | |
|
|
1243 | Feeds the given event set into the event loop, as if the specified event |
|
|
1244 | had happened for the specified watcher (which must be a pointer to an |
|
|
1245 | initialised but not necessarily started event watcher). Obviously you must |
|
|
1246 | not free the watcher as long as it has pending events. |
|
|
1247 | |
|
|
1248 | Stopping the watcher, letting libev invoke it, or calling |
|
|
1249 | C<ev_clear_pending> will clear the pending event, even if the watcher was |
|
|
1250 | not started in the first place. |
|
|
1251 | |
|
|
1252 | See also C<ev_feed_fd_event> and C<ev_feed_signal_event> for related |
|
|
1253 | functions that do not need a watcher. |
|
|
1254 | |
1238 | =back |
1255 | =back |
1239 | |
1256 | |
1240 | |
1257 | |
1241 | =head2 ASSOCIATING CUSTOM DATA WITH A WATCHER |
1258 | =head2 ASSOCIATING CUSTOM DATA WITH A WATCHER |
1242 | |
1259 | |
… | |
… | |
2124 | and might or might not set or restore the installed signal handler. |
2141 | and might or might not set or restore the installed signal handler. |
2125 | |
2142 | |
2126 | While this does not matter for the signal disposition (libev never |
2143 | While this does not matter for the signal disposition (libev never |
2127 | sets signals to C<SIG_IGN>, so handlers will be reset to C<SIG_DFL> on |
2144 | sets signals to C<SIG_IGN>, so handlers will be reset to C<SIG_DFL> on |
2128 | C<execve>), this matters for the signal mask: many programs do not expect |
2145 | C<execve>), this matters for the signal mask: many programs do not expect |
2129 | many signals to be blocked. |
2146 | certain signals to be blocked. |
2130 | |
2147 | |
2131 | This means that before calling C<exec> (from the child) you should reset |
2148 | This means that before calling C<exec> (from the child) you should reset |
2132 | the signal mask to whatever "default" you expect (all clear is a good |
2149 | the signal mask to whatever "default" you expect (all clear is a good |
2133 | choice usually). |
2150 | choice usually). |
|
|
2151 | |
|
|
2152 | The simplest way to ensure that the signal mask is reset in the child is |
|
|
2153 | to install a fork handler with C<pthread_atfork> that resets it. That will |
|
|
2154 | catch fork calls done by libraries (such as the libc) as well. |
|
|
2155 | |
|
|
2156 | In current versions of libev, you can also ensure that the signal mask is |
|
|
2157 | not blocking any signals (except temporarily, so thread users watch out) |
|
|
2158 | by specifying the C<EVFLAG_NOSIGFD> when creating the event loop. This |
|
|
2159 | is not guaranteed for future versions, however. |
2134 | |
2160 | |
2135 | =head3 Watcher-Specific Functions and Data Members |
2161 | =head3 Watcher-Specific Functions and Data Members |
2136 | |
2162 | |
2137 | =over 4 |
2163 | =over 4 |
2138 | |
2164 | |
… | |
… | |
3123 | /* doh, nothing entered */; |
3149 | /* doh, nothing entered */; |
3124 | } |
3150 | } |
3125 | |
3151 | |
3126 | ev_once (STDIN_FILENO, EV_READ, 10., stdin_ready, 0); |
3152 | ev_once (STDIN_FILENO, EV_READ, 10., stdin_ready, 0); |
3127 | |
3153 | |
3128 | =item ev_feed_event (struct ev_loop *, watcher *, int revents) |
|
|
3129 | |
|
|
3130 | Feeds the given event set into the event loop, as if the specified event |
|
|
3131 | had happened for the specified watcher (which must be a pointer to an |
|
|
3132 | initialised but not necessarily started event watcher). |
|
|
3133 | |
|
|
3134 | =item ev_feed_fd_event (struct ev_loop *, int fd, int revents) |
3154 | =item ev_feed_fd_event (struct ev_loop *, int fd, int revents) |
3135 | |
3155 | |
3136 | Feed an event on the given fd, as if a file descriptor backend detected |
3156 | Feed an event on the given fd, as if a file descriptor backend detected |
3137 | the given events it. |
3157 | the given events it. |
3138 | |
3158 | |