--- libev/ev.h 2007/10/31 10:50:05 1.7 +++ libev/ev.h 2007/11/02 22:03:00 1.23 @@ -1,22 +1,73 @@ +/* + * Copyright (c) 2007 Marc Alexander Lehmann + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials provided + * with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + #ifndef EV_H #define EV_H +#ifdef __cplusplus +extern "C" { +#endif + typedef double ev_tstamp; +/* these priorities are inclusive, higher priorities will be called earlier */ +#ifndef EV_MINPRI +# define EV_MINPRI -2 +#endif +#ifndef EV_MAXPRI +# define EV_MAXPRI +2 +#endif + /* eventmask, revents, events... */ -#define EV_UNDEF -1 /* guaranteed to be invalid */ -#define EV_NONE 0x00 -#define EV_READ 0x01 -#define EV_WRITE 0x02 -#define EV_TIMEOUT 0x04 -#define EV_SIGNAL 0x08 -#define EV_IDLE 0x10 -#define EV_CHECK 0x20 +#define EV_UNDEF -1 /* guaranteed to be invalid */ +#define EV_NONE 0x00 +#define EV_READ 0x01 +#define EV_WRITE 0x02 +#define EV_TIMEOUT 0x000100 +#define EV_PERIODIC 0x000200 +#define EV_SIGNAL 0x000400 +#define EV_IDLE 0x000800 +#define EV_CHECK 0x001000 +#define EV_PREPARE 0x002000 +#define EV_CHILD 0x004000 +#define EV_ERROR 0x800000 /* sent when an error occurs */ /* can be used to add custom fields to all watchers */ #ifndef EV_COMMON # define EV_COMMON void *data #endif +#ifndef EV_PROTOTYPES +# define EV_PROTOTYPES 1 +#endif + +#define EV_VERSION_MAJOR 1 +#define EV_VERSION_MINOR 1 /* * struct member types: @@ -29,6 +80,7 @@ #define EV_WATCHER(type) \ int active; /* private */ \ int pending; /* private */ \ + int priority; /* ro */ \ EV_COMMON; /* rw */ \ void (*cb)(struct type *, int revents); /* rw */ /* gets invoked with an eventmask */ @@ -56,6 +108,7 @@ }; /* invoked after a specific time, repeatable (based on monotonic clock) */ +/* revent EV_TIMEOUT */ struct ev_timer { EV_WATCHER_TIME (ev_timer); @@ -64,6 +117,7 @@ }; /* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */ +/* revent EV_PERIODIC */ struct ev_periodic { EV_WATCHER_TIME (ev_periodic); @@ -72,6 +126,7 @@ }; /* invoked when fd is either EV_READable or EV_WRITEable */ +/* revent EV_READ, EV_WRITE */ struct ev_io { EV_WATCHER_LIST (ev_io); @@ -81,6 +136,7 @@ }; /* invoked when the given signal has been received */ +/* revent EV_SIGNAL */ struct ev_signal { EV_WATCHER_LIST (ev_signal); @@ -89,75 +145,128 @@ }; /* invoked when the nothing else needs to be done, keeps the process from blocking */ +/* revent EV_IDLE */ struct ev_idle { EV_WATCHER (ev_idle); }; -/* invoked for each run of the mainloop, just before the next blocking vall is initiated */ +/* invoked for each run of the mainloop, just before the blocking call */ +/* you can still change events in any way you like */ +/* revent EV_PREPARE */ +struct ev_prepare +{ + EV_WATCHER (ev_prepare); +}; + +/* invoked for each run of the mainloop, just after the blocking call */ +/* revent EV_CHECK */ struct ev_check { EV_WATCHER (ev_check); }; -#define EVMETHOD_NONE 0 -#define EVMETHOD_SELECT 1 -#define EVMETHOD_EPOLL 2 -int ev_init (int flags); /* returns ev_method */ +/* invoked when sigchld is received and waitpid indicates the givne pid */ +/* revent EV_CHILD */ +struct ev_child +{ + EV_WATCHER_LIST (ev_child); + + int pid; /* ro */ + int status; /* rw, holds the exit status, use the macros from sys/wait.h */ +}; + +#define EVMETHOD_AUTO 0 /* consults environment */ +#define EVMETHOD_SELECT 1 +#define EVMETHOD_POLL 2 +#define EVMETHOD_EPOLL 4 +#define EVMETHOD_KQUEUE 8 +#define EVMETHOD_DEVPOLL 16 /* NYI */ +#define EVMETHOD_PORT 32 /* NYI */ +#define EVMETHOD_ANY ~0 /* any method, do not consult env */ +#if EV_PROTOTYPES extern int ev_method; +int ev_init (int methods); /* returns ev_method */ +int ev_version_major (void); +int ev_version_minor (void); /* these three calls are suitable for plugging into pthread_atfork */ -void ev_prefork (void); -void ev_postfork_parent (void); -void ev_postfork_child (void); +void ev_fork_prepare (void); +void ev_fork_parent (void); +void ev_fork_child (void); extern ev_tstamp ev_now; /* time w.r.t. timers and the eventloop, updated after each poll */ ev_tstamp ev_time (void); +#endif #define EVLOOP_NONBLOCK 1 /* do not block/wait */ #define EVLOOP_ONESHOT 2 /* block *once* only */ +#if EV_PROTOTYPES void ev_loop (int flags); extern int ev_loop_done; /* set to 1 to break out of event loop, set to 2 to break out of all event loops */ +/* convinience function, wait for a single event, without registering an event watcher */ +/* if timeout is < 0, do wait indefinitely */ +void ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg); +#endif + /* these may evaluate ev multiple times, and the other arguments at most once */ -/* either use evw_init + evXXX_set, or the evXXX_init macro, below, to first initialise a watcher */ -#define evw_init(ev,cb_) do { (ev)->active = 0; (ev)->cb = (cb_); } while (0) +/* either use ev_watcher_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */ +#define ev_watcher_init(ev,cb_) do { (ev)->active = (ev)->pending = (ev)->priority = 0; (ev)->cb = (cb_); } while (0) -#define evio_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0) -#define evtimer_set(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0) -#define evperiodic_set(ev,at_,interval_) do { (ev)->at = (at_); (ev)->interval = (interval_); } while (0) -#define evsignal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0) -#define evcheck_set(ev) /* nop, yes this is a serious in-joke */ -#define evidle_set(ev) /* nop, yes this is a serious in-joke */ - -#define evio_init(ev,cb,fd,events) do { evw_init ((ev), (cb)); evio_set ((ev),(fd),(events)); } while (0) -#define evtimer_init(ev,cb,after,repeat) do { evw_init ((ev), (cb)); evtimer_set ((ev),(after),(repeat)); } while (0) -#define evperiodic_init(ev,cb,at,interval) do { evw_init ((ev), (cb)); evperiodic_set ((ev),(at),(interval)); } while (0) -#define evsignal_init(ev,cb,signum) do { evw_init ((ev), (cb)); evsignal_set ((ev), (signum)); } while (0) -#define evcheck_init(ev,cb) do { evw_init ((ev), (cb)); evcheck_set ((ev)); } while (0) -#define evidle_init(ev,cb) do { evw_init ((ev), (cb)); evidle_set ((ev)); } while (0) +#define ev_io_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0) +#define ev_timer_set(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0) +#define ev_periodic_set(ev,at_,interval_) do { (ev)->at = (at_); (ev)->interval = (interval_); } while (0) +#define ev_signal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0) +#define ev_idle_set(ev) /* nop, yes, this is a serious in-joke */ +#define ev_prepare_set(ev) /* nop, yes, this is a serious in-joke */ +#define ev_check_set(ev) /* nop, yes, this is a serious in-joke */ +#define ev_child_set(ev,pid_) do { (ev)->pid = (pid_); } while (0) + +#define ev_io_init(ev,cb,fd,events) do { ev_watcher_init ((ev), (cb)); ev_io_set ((ev),(fd),(events)); } while (0) +#define ev_timer_init(ev,cb,after,repeat) do { ev_watcher_init ((ev), (cb)); ev_timer_set ((ev),(after),(repeat)); } while (0) +#define ev_periodic_init(ev,cb,at,interval) do { ev_watcher_init ((ev), (cb)); ev_periodic_set ((ev),(at),(interval)); } while (0) +#define ev_signal_init(ev,cb,signum) do { ev_watcher_init ((ev), (cb)); ev_signal_set ((ev), (signum)); } while (0) +#define ev_idle_init(ev,cb) do { ev_watcher_init ((ev), (cb)); ev_idle_set ((ev)); } while (0) +#define ev_prepare_init(ev,cb) do { ev_watcher_init ((ev), (cb)); ev_prepare_set ((ev)); } while (0) +#define ev_check_init(ev,cb) do { ev_watcher_init ((ev), (cb)); ev_check_set ((ev)); } while (0) +#define ev_child_init(ev,cb,pid) do { ev_watcher_init ((ev), (cb)); ev_child_set ((ev),(pid)); } while (0) -#define ev_is_active(ev) (0 + (ev)->active) /* true when the watcher has been started */ +#define ev_is_active(ev) (0 + (ev)->active) /* true when the watcher has been started */ +#define ev_set_priority(ev,pri) (ev)->priority = pri /* stopping (enabling, adding) a watcher does nothing if it is already running */ /* stopping (disabling, deleting) a watcher does nothing unless its already running */ -void evio_start (struct ev_io *w); -void evio_stop (struct ev_io *w); +#if EV_PROTOTYPES +void ev_io_start (struct ev_io *w); +void ev_io_stop (struct ev_io *w); + +void ev_timer_start (struct ev_timer *w); +void ev_timer_stop (struct ev_timer *w); +void ev_timer_again (struct ev_timer *w); /* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */ + +void ev_periodic_start (struct ev_periodic *w); +void ev_periodic_stop (struct ev_periodic *w); -void evtimer_start (struct ev_timer *w); -void evtimer_stop (struct ev_timer *w); +void ev_signal_start (struct ev_signal *w); +void ev_signal_stop (struct ev_signal *w); -void evperiodic_start (struct ev_periodic *w); -void evperiodic_stop (struct ev_periodic *w); +void ev_idle_start (struct ev_idle *w); +void ev_idle_stop (struct ev_idle *w); -void evsignal_start (struct ev_signal *w); -void evsignal_stop (struct ev_signal *w); +void ev_prepare_start (struct ev_prepare *w); +void ev_prepare_stop (struct ev_prepare *w); -void evidle_start (struct ev_idle *w); -void evidle_stop (struct ev_idle *w); +void ev_check_start (struct ev_check *w); +void ev_check_stop (struct ev_check *w); -void evcheck_start (struct ev_check *w); -void evcheck_stop (struct ev_check *w); +void ev_child_start (struct ev_child *w); +void ev_child_stop (struct ev_child *w); +#endif + +#ifdef __cplusplus +} +#endif #endif