X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/759051fdbf8b3370705e05dac2e2d7525d882e4c..dfa948951dd77048e8b05540d86c4ffe1a0205d2:/ev.pod diff --git a/ev.pod b/ev.pod index 063c01d..905e935 100644 --- a/ev.pod +++ b/ev.pod @@ -913,6 +913,30 @@ whether a file descriptor is really ready with a known-to-be good interface such as poll (fortunately in our Xlib example, Xlib already does this on its own, so its quite safe to use). +=head3 The special problem of disappearing file descriptors + +Some backends (e.g kqueue, epoll) need to be told about closing a file +descriptor (either by calling C explicitly or by any other means, +such as C). The reason is that you register interest in some file +descriptor, but when it goes away, the operating system will silently drop +this interest. If another file descriptor with the same number then is +registered with libev, there is no efficient way to see that this is, in +fact, a different file descriptor. + +To avoid having to explicitly tell libev about such cases, libev follows +the following policy: Each time C is being called, libev +will assume that this is potentially a new file descriptor, otherwise +it is assumed that the file descriptor stays the same. That means that +you I to call C (or C) when you change the +descriptor even if the file descriptor number itself did not change. + +This is how one would do it normally anyway, the important point is that +the libev application should not optimise around libev but should leave +optimisations to libev. + + +=head3 Watcher-Specific Functions + =over 4 =item ev_io_init (ev_io *, callback, int fd, int events) @@ -975,6 +999,8 @@ The callback is guarenteed to be invoked only when its timeout has passed, but if multiple timers become ready during the same loop iteration then order of execution is undefined. +=head3 Watcher-Specific Functions and Data Members + =over 4 =item ev_timer_init (ev_timer *, callback, ev_tstamp after, ev_tstamp repeat) @@ -1089,6 +1115,8 @@ As with timers, the callback is guarenteed to be invoked only when the time (C) has been passed, but if multiple periodic timers become ready during the same loop iteration then order of execution is undefined. +=head3 Watcher-Specific Functions and Data Members + =over 4 =item ev_periodic_init (ev_periodic *, callback, ev_tstamp at, ev_tstamp interval, reschedule_cb) @@ -1244,6 +1272,8 @@ as you don't register any with libev). Similarly, when the last signal watcher for a signal is stopped libev will reset the signal handler to SIG_DFL (regardless of what it was set to before). +=head3 Watcher-Specific Functions and Data Members + =over 4 =item ev_signal_init (ev_signal *, callback, int signum) @@ -1265,6 +1295,8 @@ The signal the watcher watches out for. Child watchers trigger when your process receives a SIGCHLD in response to some child status changes (most typically when a child of yours dies). +=head3 Watcher-Specific Functions and Data Members + =over 4 =item ev_child_init (ev_child *, callback, int pid) @@ -1342,6 +1374,8 @@ to fall back to regular polling again even with inotify, but changes are usually detected immediately, and if the file exists there will be no polling. +=head3 Watcher-Specific Functions and Data Members + =over 4 =item ev_stat_init (ev_stat *, callback, const char *path, ev_tstamp interval) @@ -1433,6 +1467,8 @@ effect on its own sometimes), idle watchers are a good place to do "pseudo-background processing", or delay processing stuff to after the event loop has handled all outstanding events. +=head3 Watcher-Specific Functions and Data Members + =over 4 =item ev_idle_init (ev_signal *, callback) @@ -1509,6 +1545,8 @@ loops those other event loops might be in an unusable state until their C watcher ran (always remind yourself to coexist peacefully with others). +=head3 Watcher-Specific Functions and Data Members + =over 4 =item ev_prepare_init (ev_prepare *, callback) @@ -1719,6 +1757,8 @@ create it, and if that fails, use the normal loop for everything: else loop_lo = loop_hi; +=head3 Watcher-Specific Functions and Data Members + =over 4 =item ev_embed_init (ev_embed *, callback, struct ev_loop *embedded_loop) @@ -1754,6 +1794,8 @@ and only in the child after the fork. If whoever good citizen calling C cheats and calls it in the wrong process, the fork handlers will be invoked, too, of course. +=head3 Watcher-Specific Functions and Data Members + =over 4 =item ev_fork_init (ev_signal *, callback) @@ -1979,16 +2021,16 @@ constructor already stores the event loop. Stops the watcher if it is active. Again, no C argument. -=item w->again () C, C only +=item w->again () (C, C only) For C and C, this invokes the corresponding C function. -=item w->sweep () C only +=item w->sweep () (C only) Invokes C. -=item w->update () C only +=item w->update () (C only) Invokes C. @@ -2018,9 +2060,9 @@ the constructor. =head1 MACRO MAGIC -Libev can be compiled with a variety of options, the most fundemantal is -C. This option determines whether (most) functions and -callbacks have an initial C argument. +Libev can be compiled with a variety of options, the most fundamantal +of which is C. This option determines whether (most) +functions and callbacks have an initial C argument. To make it easier to write programs that cope with either variant, the following macros are defined: