X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/7e7a7e7d2d8de852b9782938dd114dfeb060b1db..736c339cd39bb22dacbf56274203876871f63196:/ev.h diff --git a/ev.h b/ev.h index 865338f..1ffed6f 100644 --- a/ev.h +++ b/ev.h @@ -1,36 +1,123 @@ +/* + * 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; /* eventmask, revents, events... */ -#define EV_UNDEF -1 /* guaranteed to be invalid */ -#define EV_NONE 0 -#define EV_READ 1 -#define EV_WRITE 2 -#define EV_TIMEOUT 4 -#define EV_SIGNAL 8 +#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: + * private: you can look at them, but not change them, and they might not mean anything to you. + * ro: can be read anytime, but only changed when the watcher isn't active + * rw: can be read and modified anytime, even when the watcher is active + */ /* shared by all watchers */ #define EV_WATCHER(type) \ int active; /* private */ \ int pending; /* private */ \ - void *data; /* rw */ \ - void (*cb)(struct type *, int revents) /* rw */ + EV_COMMON; /* rw */ \ + void (*cb)(struct type *, int revents); /* rw */ /* gets invoked with an eventmask */ #define EV_WATCHER_LIST(type) \ EV_WATCHER (type); \ struct type *next /* private */ +#define EV_WATCHER_TIME(type) \ + EV_WATCHER (type); \ + ev_tstamp at /* private */ + +/* base class, nothing to see here unless you subclass */ +struct ev_watcher { + EV_WATCHER (ev_watcher); +}; + +/* base class, nothing to see here unless you subclass */ +struct ev_watcher_list { + EV_WATCHER_LIST (ev_watcher_list); +}; + +/* base class, nothing to see here unless you subclass */ +struct ev_watcher_time { + EV_WATCHER_TIME (ev_watcher_time); +}; + +/* invoked after a specific time, repeatable (based on monotonic clock) */ +/* revent EV_TIMEOUT */ struct ev_timer { - EV_WATCHER_LIST (ev_timer); + EV_WATCHER_TIME (ev_timer); - ev_tstamp at; /* ro */ ev_tstamp repeat; /* rw */ - unsigned char is_abs; /* rw */ }; +/* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */ +/* revent EV_PERIODIC */ +struct ev_periodic +{ + EV_WATCHER_TIME (ev_periodic); + + ev_tstamp interval; /* rw */ +}; + +/* invoked when fd is either EV_READable or EV_WRITEable */ +/* revent EV_READ, EV_WRITE */ struct ev_io { EV_WATCHER_LIST (ev_io); @@ -39,6 +126,8 @@ struct ev_io int events; /* ro */ }; +/* invoked when the given signal has been received */ +/* revent EV_SIGNAL */ struct ev_signal { EV_WATCHER_LIST (ev_signal); @@ -46,41 +135,123 @@ struct ev_signal int signum; /* ro */ }; +/* 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 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); +}; + +/* 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_NONE 0 #define EVMETHOD_SELECT 1 #define EVMETHOD_EPOLL 2 -int ev_init (int flags); +#if EV_PROTOTYPES extern int ev_method; +int ev_init (int flags); /* returns ev_method */ +int ev_version_major (void); +int ev_version_minor (void); -void ev_prefork (void); -void ev_postfork_parent (void); -void ev_postfork_child (void); +/* these three calls are suitable for plugging into pthread_atfork */ +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 */ -int ev_loop (int flags); -extern int ev_loop_done; /* set to 1 to break out of event loop */ +#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 */ -#define evw_init(ev,cb_,data_) do { (ev)->active = 0; (ev)->cb = (cb_); (ev)->data = (void *)data_; } while (0) -#define evio_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0) -#define evtimer_set_rel(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); (ev)->is_abs = 0; } while (0) -#define evtimer_set_abs(ev,at_,repeat_) do { (ev)->at = (at_); (ev)->repeat = (repeat_); (ev)->is_abs = 1; } while (0) -#define evsignal_set(ev,signum_) do { (ev)->signum = (signum_); } 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 = 0; (ev)->pending = 0; (ev)->cb = (cb_); } 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 */ -void evio_start (struct ev_io *w); -void evio_stop (struct ev_io *w); +/* stopping (enabling, adding) a watcher does nothing if it is already running */ +/* stopping (disabling, deleting) a watcher does nothing unless its already running */ +#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 ev_signal_start (struct ev_signal *w); +void ev_signal_stop (struct ev_signal *w); -void evtimer_start (struct ev_timer *w); -void evtimer_stop (struct ev_timer *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 ev_check_start (struct ev_check *w); +void ev_check_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