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208 lines
7.2 KiB
C
208 lines
7.2 KiB
C
/*
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* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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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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#define EV_ERROR (0x3f|0x80)
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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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#ifndef EV_PROTOTYPES
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# define EV_PROTOTYPES 1
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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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/* base class, nothing to see here unless you subclass */
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struct ev_watcher {
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EV_WATCHER (ev_watcher);
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};
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/* base class, nothing to see here unless you subclass */
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struct ev_watcher_list {
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EV_WATCHER_LIST (ev_watcher_list);
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};
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/* base class, nothing to see here unless you subclass */
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struct ev_watcher_time {
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EV_WATCHER_TIME (ev_watcher_time);
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};
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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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#if EV_PROTOTYPES
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extern int ev_method;
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int ev_init (int flags); /* returns 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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#endif
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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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#if EV_PROTOTYPES
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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, set to 2 to break out of all event loops */
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/* convinience function, wait for a single event, without registering an event watcher */
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/* if timeout is < 0, do wait indefinitely */
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void ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg);
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#endif
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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)->pending = 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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#if EV_PROTOTYPES
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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 evtimer_again (struct ev_timer *w); /* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */
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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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#endif
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