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#ifndef EV_H |
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#define EV_H |
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typedef double ev_tstamp; |
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/* eventmask, revents, events... */ |
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#define EV_UNDEF -1 /* guaranteed to be invalid */ |
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#define EV_NONE 0x00 |
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#define EV_READ 0x01 |
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#define EV_WRITE 0x02 |
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#define EV_TIMEOUT 0x04 |
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#define EV_SIGNAL 0x08 |
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#define EV_IDLE 0x10 |
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#define EV_CHECK 0x20 |
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/* can be used to add custom fields to all watchers */ |
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#ifndef EV_COMMON |
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# define EV_COMMON void *data |
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#endif |
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/* |
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* struct member types: |
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* private: you can look at them, but not change them, and they might not mean anything to you. |
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* ro: can be read anytime, but only changed when the watcher isn't active |
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* rw: can be read and modified anytime, even when the watcher is active |
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*/ |
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/* shared by all watchers */ |
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#define EV_WATCHER(type) \ |
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int active; /* private */ \ |
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int pending; /* private */ \ |
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EV_COMMON; /* rw */ \ |
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void (*cb)(struct type *, int revents); /* rw */ /* gets invoked with an eventmask */ |
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#define EV_WATCHER_LIST(type) \ |
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EV_WATCHER (type); \ |
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struct type *next /* private */ |
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#define EV_WATCHER_TIME(type) \ |
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EV_WATCHER (type); \ |
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ev_tstamp at /* private */ |
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/* invoked after a specific time, repeatable (based on monotonic clock) */ |
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struct ev_timer |
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{ |
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EV_WATCHER_TIME (ev_timer); |
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ev_tstamp repeat; /* rw */ |
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}; |
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/* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */ |
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struct ev_periodic |
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{ |
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EV_WATCHER_TIME (ev_periodic); |
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ev_tstamp interval; /* rw */ |
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}; |
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/* invoked when fd is either EV_READable or EV_WRITEable */ |
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struct ev_io |
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{ |
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EV_WATCHER_LIST (ev_io); |
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int fd; /* ro */ |
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int events; /* ro */ |
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}; |
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/* invoked when the given signal has been received */ |
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struct ev_signal |
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{ |
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EV_WATCHER_LIST (ev_signal); |
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int signum; /* ro */ |
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}; |
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/* invoked when the nothing else needs to be done, keeps the process from blocking */ |
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struct ev_idle |
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{ |
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EV_WATCHER (ev_idle); |
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}; |
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/* invoked for each run of the mainloop, just before the next blocking vall is initiated */ |
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struct ev_check |
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{ |
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EV_WATCHER (ev_check); |
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}; |
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#define EVMETHOD_NONE 0 |
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#define EVMETHOD_SELECT 1 |
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#define EVMETHOD_EPOLL 2 |
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int ev_init (int flags); /* returns ev_method */ |
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extern int ev_method; |
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/* these three calls are suitable for plugging into pthread_atfork */ |
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void ev_prefork (void); |
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void ev_postfork_parent (void); |
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void ev_postfork_child (void); |
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extern ev_tstamp ev_now; /* time w.r.t. timers and the eventloop, updated after each poll */ |
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ev_tstamp ev_time (void); |
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#define EVLOOP_NONBLOCK 1 /* do not block/wait */ |
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#define EVLOOP_ONESHOT 2 /* block *once* only */ |
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void ev_loop (int flags); |
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extern int ev_loop_done; /* set to 1 to break out of event loop */ |
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/* these may evaluate ev multiple times, and the other arguments at most once */ |
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/* either use evw_init + evXXX_set, or the evXXX_init macro, below, to first initialise a watcher */ |
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#define evw_init(ev,cb_) do { (ev)->active = 0; (ev)->cb = (cb_); } while (0) |
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#define evio_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0) |
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#define evtimer_set(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0) |
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#define evperiodic_set(ev,at_,interval_) do { (ev)->at = (at_); (ev)->interval = (interval_); } while (0) |
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#define evsignal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0) |
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#define evcheck_set(ev) /* nop, yes this is a serious in-joke */ |
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#define evidle_set(ev) /* nop, yes this is a serious in-joke */ |
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#define evio_init(ev,cb,fd,events) do { evw_init ((ev), (cb)); evio_set ((ev),(fd),(events)); } while (0) |
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#define evtimer_init(ev,cb,after,repeat) do { evw_init ((ev), (cb)); evtimer_set ((ev),(after),(repeat)); } while (0) |
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#define evperiodic_init(ev,cb,at,interval) do { evw_init ((ev), (cb)); evperiodic_set ((ev),(at),(interval)); } while (0) |
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#define evsignal_init(ev,cb,signum) do { evw_init ((ev), (cb)); evsignal_set ((ev), (signum)); } while (0) |
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#define evcheck_init(ev,cb) do { evw_init ((ev), (cb)); evcheck_set ((ev)); } while (0) |
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#define evidle_init(ev,cb) do { evw_init ((ev), (cb)); evidle_set ((ev)); } while (0) |
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#define ev_is_active(ev) (0 + (ev)->active) /* true when the watcher has been started */ |
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/* stopping (enabling, adding) a watcher does nothing if it is already running */ |
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/* stopping (disabling, deleting) a watcher does nothing unless its already running */ |
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void evio_start (struct ev_io *w); |
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void evio_stop (struct ev_io *w); |
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void evtimer_start (struct ev_timer *w); |
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void evtimer_stop (struct ev_timer *w); |
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void evperiodic_start (struct ev_periodic *w); |
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void evperiodic_stop (struct ev_periodic *w); |
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void evsignal_start (struct ev_signal *w); |
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void evsignal_stop (struct ev_signal *w); |
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void evidle_start (struct ev_idle *w); |
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void evidle_stop (struct ev_idle *w); |
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void evcheck_start (struct ev_check *w); |
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void evcheck_stop (struct ev_check *w); |
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#endif |
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