Mirror of :pserver:anonymous@cvs.schmorp.de/schmorpforge libev http://software.schmorp.de/pkg/libev.html
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/*
* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
* 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
typedef double ev_tstamp;
/* 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_PREPARE 0x40
#define EV_CHILD 0x80
#define EV_ERROR (0xff|0x8000)
/* 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
/*
* 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 */ \
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) */
struct ev_timer
{
EV_WATCHER_TIME (ev_timer);
ev_tstamp repeat; /* rw */
};
/* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */
struct ev_periodic
{
EV_WATCHER_TIME (ev_periodic);
ev_tstamp interval; /* rw */
};
/* invoked when fd is either EV_READable or EV_WRITEable */
struct ev_io
{
EV_WATCHER_LIST (ev_io);
int fd; /* ro */
int events; /* ro */
};
/* invoked when the given signal has been received */
struct ev_signal
{
EV_WATCHER_LIST (ev_signal);
int signum; /* ro */
};
/* invoked when the nothing else needs to be done, keeps the process from blocking */
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 */
struct ev_prepare
{
EV_WATCHER (ev_prepare);
};
/* invoked for each run of the mainloop, just after the blocking call */
struct ev_check
{
EV_WATCHER (ev_check);
};
/* invoked when sigchld is received and waitpid indicates the givne pid */
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
#if EV_PROTOTYPES
extern int ev_method;
int ev_init (int flags); /* returns ev_method */
/* these three calls are suitable for plugging into pthread_atfork */
void ev_prefork (void);
void ev_postfork_parent (void);
void ev_postfork_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)->pending = 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 evidle_set(ev) /* nop, yes, this is a serious in-joke */
#define evprepare_set(ev) /* nop, yes, this is a serious in-joke */
#define evcheck_set(ev) /* nop, yes, this is a serious in-joke */
#define evchild_set(ev,pid_) do { (ev)->pid = (pid_); } while (0)
#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 evidle_init(ev,cb) do { evw_init ((ev), (cb)); evidle_set ((ev)); } while (0)
#define evprepare_init(ev,cb) do { evw_init ((ev), (cb)); evprepare_set ((ev)); } while (0)
#define evcheck_init(ev,cb) do { evw_init ((ev), (cb)); evcheck_set ((ev)); } while (0)
#define evchild_init(ev,cb,pid) do { evw_init ((ev), (cb)); evchild_set ((ev),(pid)); } while (0)
#define ev_is_active(ev) (0 + (ev)->active) /* true when the watcher has been started */
/* 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 evio_start (struct ev_io *w);
void evio_stop (struct ev_io *w);
void evtimer_start (struct ev_timer *w);
void evtimer_stop (struct ev_timer *w);
void evtimer_again (struct ev_timer *w); /* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */
void evperiodic_start (struct ev_periodic *w);
void evperiodic_stop (struct ev_periodic *w);
void evsignal_start (struct ev_signal *w);
void evsignal_stop (struct ev_signal *w);
void evidle_start (struct ev_idle *w);
void evidle_stop (struct ev_idle *w);
void evprepare_start (struct ev_prepare *w);
void evprepare_stop (struct ev_prepare *w);
void evcheck_start (struct ev_check *w);
void evcheck_stop (struct ev_check *w);
void evchild_start (struct ev_child *w);
void evchild_stop (struct ev_child *w);
#endif
#endif