libev/event.c

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/*
* libevent compatibility layer
*
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* Copyright (c) 2007,2008,2009,2010,2012 Marc Alexander Lehmann <libev@schmorp.de>
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* All rights reserved.
*
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* Redistribution and use in source and binary forms, with or without modifica-
* tion, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
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*
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* 2. 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.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
* CIAL, 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 OTH-
* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License ("GPL") version 2 or any later version,
* in which case the provisions of the GPL are applicable instead of
* the above. If you wish to allow the use of your version of this file
* only under the terms of the GPL and not to allow others to use your
* version of this file under the BSD license, indicate your decision
* by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL. If you do not delete the
* provisions above, a recipient may use your version of this file under
* either the BSD or the GPL.
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*/
#include <stddef.h>
#include <stdlib.h>
#include <assert.h>
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#ifdef EV_EVENT_H
# include EV_EVENT_H
#else
# include "event.h"
#endif
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#if EV_MULTIPLICITY
# define dLOOPev struct ev_loop *loop = (struct ev_loop *)ev->ev_base
# define dLOOPbase struct ev_loop *loop = (struct ev_loop *)base
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#else
# define dLOOPev
# define dLOOPbase
#endif
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/* never accessed, will always be cast from/to ev_loop */
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struct event_base
{
int dummy;
};
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static struct event_base *ev_x_cur;
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static ev_tstamp
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ev_tv_get (struct timeval *tv)
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{
if (tv)
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{
ev_tstamp after = tv->tv_sec + tv->tv_usec * 1e-6;
return after ? after : 1e-6;
}
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else
return -1.;
}
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#define EVENT_STRINGIFY(s) # s
#define EVENT_VERSION(a,b) EVENT_STRINGIFY (a) "." EVENT_STRINGIFY (b)
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const char *event_get_version (void)
{
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/* returns ABI, not API or library, version */
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return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
}
const char *event_get_method (void)
{
return "libev";
}
void *event_init (void)
{
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#if EV_MULTIPLICITY
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if (ev_x_cur)
ev_x_cur = (struct event_base *)ev_loop_new (EVFLAG_AUTO);
else
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ev_x_cur = (struct event_base *)ev_default_loop (EVFLAG_AUTO);
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#else
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assert (("libev: multiple event bases not supported when not compiled with EV_MULTIPLICITY", !ev_x_cur));
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ev_x_cur = (struct event_base *)(long)ev_default_loop (EVFLAG_AUTO);
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#endif
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return ev_x_cur;
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}
void event_base_free (struct event_base *base)
{
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dLOOPbase;
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#if EV_MULTIPLICITY
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if (!ev_is_default_loop (loop))
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ev_loop_destroy (loop);
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#endif
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}
int event_dispatch (void)
{
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return event_base_dispatch (ev_x_cur);
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}
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#ifdef EV_STANDALONE
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void event_set_log_callback (event_log_cb cb)
{
/* nop */
}
#endif
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int event_loop (int flags)
{
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return event_base_loop (ev_x_cur, flags);
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}
int event_loopexit (struct timeval *tv)
{
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return event_base_loopexit (ev_x_cur, tv);
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}
static void
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ev_x_cb (struct event *ev, int revents)
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{
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revents &= EV_READ | EV_WRITE | EV_TIMER | EV_SIGNAL;
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ev->ev_res = revents;
ev->ev_callback (ev->ev_fd, (short)revents, ev->ev_arg);
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}
static void
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ev_x_cb_sig (EV_P_ struct ev_signal *w, int revents)
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{
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struct event *ev = (struct event *)(((char *)w) - offsetof (struct event, iosig.sig));
if (revents & EV_ERROR)
event_del (ev);
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ev_x_cb (ev, revents);
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}
static void
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ev_x_cb_io (EV_P_ struct ev_io *w, int revents)
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{
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struct event *ev = (struct event *)(((char *)w) - offsetof (struct event, iosig.io));
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if ((revents & EV_ERROR) || !(ev->ev_events & EV_PERSIST))
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event_del (ev);
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ev_x_cb (ev, revents);
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}
static void
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ev_x_cb_to (EV_P_ struct ev_timer *w, int revents)
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{
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struct event *ev = (struct event *)(((char *)w) - offsetof (struct event, to));
event_del (ev);
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ev_x_cb (ev, revents);
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}
void event_set (struct event *ev, int fd, short events, void (*cb)(int, short, void *), void *arg)
{
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if (events & EV_SIGNAL)
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ev_init (&ev->iosig.sig, ev_x_cb_sig);
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else
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ev_init (&ev->iosig.io, ev_x_cb_io);
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ev_init (&ev->to, ev_x_cb_to);
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ev->ev_base = ev_x_cur; /* not threadsafe, but it's how libevent works */
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ev->ev_fd = fd;
ev->ev_events = events;
ev->ev_pri = 0;
ev->ev_callback = cb;
ev->ev_arg = arg;
ev->ev_res = 0;
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ev->ev_flags = EVLIST_INIT;
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}
int event_once (int fd, short events, void (*cb)(int, short, void *), void *arg, struct timeval *tv)
{
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return event_base_once (ev_x_cur, fd, events, cb, arg, tv);
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}
int event_add (struct event *ev, struct timeval *tv)
{
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dLOOPev;
if (ev->ev_events & EV_SIGNAL)
{
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if (!ev_is_active (&ev->iosig.sig))
{
ev_signal_set (&ev->iosig.sig, ev->ev_fd);
ev_signal_start (EV_A_ &ev->iosig.sig);
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ev->ev_flags |= EVLIST_SIGNAL;
}
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}
else if (ev->ev_events & (EV_READ | EV_WRITE))
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{
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if (!ev_is_active (&ev->iosig.io))
{
ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ | EV_WRITE));
ev_io_start (EV_A_ &ev->iosig.io);
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ev->ev_flags |= EVLIST_INSERTED;
}
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}
if (tv)
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{
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ev->to.repeat = ev_tv_get (tv);
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ev_timer_again (EV_A_ &ev->to);
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ev->ev_flags |= EVLIST_TIMEOUT;
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}
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else
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{
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ev_timer_stop (EV_A_ &ev->to);
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ev->ev_flags &= ~EVLIST_TIMEOUT;
}
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ev->ev_flags |= EVLIST_ACTIVE;
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return 0;
}
int event_del (struct event *ev)
{
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dLOOPev;
if (ev->ev_events & EV_SIGNAL)
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ev_signal_stop (EV_A_ &ev->iosig.sig);
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else if (ev->ev_events & (EV_READ | EV_WRITE))
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ev_io_stop (EV_A_ &ev->iosig.io);
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if (ev_is_active (&ev->to))
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ev_timer_stop (EV_A_ &ev->to);
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ev->ev_flags = EVLIST_INIT;
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return 0;
}
void event_active (struct event *ev, int res, short ncalls)
{
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dLOOPev;
if (res & EV_TIMEOUT)
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ev_feed_event (EV_A_ &ev->to, res & EV_TIMEOUT);
if (res & EV_SIGNAL)
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ev_feed_event (EV_A_ &ev->iosig.sig, res & EV_SIGNAL);
if (res & (EV_READ | EV_WRITE))
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ev_feed_event (EV_A_ &ev->iosig.io, res & (EV_READ | EV_WRITE));
}
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int event_pending (struct event *ev, short events, struct timeval *tv)
{
short revents = 0;
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dLOOPev;
if (ev->ev_events & EV_SIGNAL)
{
/* sig */
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if (ev_is_active (&ev->iosig.sig) || ev_is_pending (&ev->iosig.sig))
revents |= EV_SIGNAL;
}
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else if (ev->ev_events & (EV_READ | EV_WRITE))
{
/* io */
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if (ev_is_active (&ev->iosig.io) || ev_is_pending (&ev->iosig.io))
revents |= ev->ev_events & (EV_READ | EV_WRITE);
}
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if (ev->ev_events & EV_TIMEOUT || ev_is_active (&ev->to) || ev_is_pending (&ev->to))
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{
revents |= EV_TIMEOUT;
if (tv)
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{
ev_tstamp at = ev_now (EV_A);
tv->tv_sec = (long)at;
tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
}
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}
return events & revents;
}
int event_priority_init (int npri)
{
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return event_base_priority_init (ev_x_cur, npri);
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}
int event_priority_set (struct event *ev, int pri)
{
ev->ev_pri = pri;
return 0;
}
int event_base_set (struct event_base *base, struct event *ev)
{
ev->ev_base = base;
return 0;
}
int event_base_loop (struct event_base *base, int flags)
{
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dLOOPbase;
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ev_run (EV_A_ flags);
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return 0;
}
int event_base_dispatch (struct event_base *base)
{
return event_base_loop (base, 0);
}
static void
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ev_x_loopexit_cb (int revents, void *base)
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{
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dLOOPbase;
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ev_break (EV_A_ EVBREAK_ONE);
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}
int event_base_loopexit (struct event_base *base, struct timeval *tv)
{
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ev_tstamp after = ev_tv_get (tv);
dLOOPbase;
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ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., ev_x_loopexit_cb, (void *)base);
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return 0;
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}
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struct ev_x_once
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{
int fd;
void (*cb)(int, short, void *);
void *arg;
};
static void
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ev_x_once_cb (int revents, void *arg)
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{
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struct ev_x_once *once = (struct ev_x_once *)arg;
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once->cb (once->fd, (short)revents, once->arg);
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free (once);
}
int event_base_once (struct event_base *base, int fd, short events, void (*cb)(int, short, void *), void *arg, struct timeval *tv)
{
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struct ev_x_once *once = (struct ev_x_once *)malloc (sizeof (struct ev_x_once));
dLOOPbase;
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if (!once)
return -1;
once->fd = fd;
once->cb = cb;
once->arg = arg;
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ev_once (EV_A_ fd, events & (EV_READ | EV_WRITE), ev_tv_get (tv), ev_x_once_cb, (void *)once);
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return 0;
}
int event_base_priority_init (struct event_base *base, int npri)
{
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/*dLOOPbase;*/
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return 0;
}