Mirror of :pserver:anonymous@cvs.schmorp.de/schmorpforge libev http://software.schmorp.de/pkg/libev.html
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/*
* libevent compatibility layer
*
* 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.
*/
#include <stddef.h>
#include <stdlib.h>
#include <sys/time.h>
#include <assert.h>
#include "ev.h"
#include "event.h"
#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
#else
# define dLOOPev
# define dLOOPbase
#endif
/* never accessed, will always be cast from/to ev_loop */
struct event_base
{
int dummy;
};
static struct event_base *x_cur;
static void
tv_set (struct timeval *tv, ev_tstamp at)
{
tv->tv_sec = (long)at;
tv->tv_usec = (long)((at - (ev_tstamp)tv->tv_sec) * 1e6);
}
static ev_tstamp
tv_get (struct timeval *tv)
{
if (tv)
return tv->tv_sec + tv->tv_usec * 1e-6;
else
return -1.;
}
#define EVENT_VERSION(a,b) # a "." # b
const char *event_get_version (void)
{
return EVENT_VERSION (EV_VERSION_MAJOR, EV_VERSION_MINOR);
}
const char *event_get_method (void)
{
return "libev";
}
void *event_init (void)
{
#if EV_MULTIPLICITY
if (x_cur)
x_cur = (struct event_base *)ev_loop_new (EVMETHOD_AUTO);
else
x_cur = (struct event_base *)ev_default_loop (EVMETHOD_AUTO);
#else
assert (("multiple event bases not supported when not compiled with EV_MULTIPLICITY", !x_cur));
x_cur = (struct event_base *)ev_default_loop (EVMETHOD_AUTO);
#endif
return x_cur;
}
void event_base_free (struct event_base *base)
{
dLOOPbase;
#if EV_MULTIPLICITY
if (ev_default_loop (EVMETHOD_AUTO) != loop)
ev_loop_destroy (loop);
#endif
}
int event_dispatch (void)
{
return event_base_dispatch (x_cur);
}
#ifdef EV_STANDALONE
void event_set_log_callback (event_log_cb cb)
{
/* nop */
}
#endif
int event_loop (int flags)
{
return event_base_loop (x_cur, flags);
}
int event_loopexit (struct timeval *tv)
{
return event_base_loopexit (x_cur, tv);
}
static void
x_cb (struct event *ev, int revents)
{
revents &= EV_READ | EV_WRITE | EV_TIMEOUT | EV_SIGNAL;
ev->ev_res = revents;
ev->ev_callback (ev->ev_fd, revents, ev->ev_arg);
}
static void
x_cb_sig (EV_P_ struct ev_signal *w, int revents)
{
x_cb ((struct event *)(((char *)w) - offsetof (struct event, iosig.sig)), revents);
}
static void
x_cb_io (EV_P_ struct ev_io *w, int revents)
{
struct event *ev = (struct event *)(((char *)w) - offsetof (struct event, iosig.io));
if (!(ev->ev_events & EV_PERSIST) && ev_is_active (w))
ev_io_stop (EV_A_ w);
x_cb (ev, revents);
}
static void
x_cb_to (EV_P_ struct ev_timer *w, int revents)
{
x_cb ((struct event *)(((char *)w) - offsetof (struct event, to)), revents);
}
void event_set (struct event *ev, int fd, short events, void (*cb)(int, short, void *), void *arg)
{
if (!ev->initialised)
{
ev->initialised = 1;
if (events & EV_SIGNAL)
ev_watcher_init (&ev->iosig.sig, x_cb_sig);
else
ev_watcher_init (&ev->iosig.io, x_cb_io);
ev_watcher_init (&ev->to, x_cb_to);
}
ev->ev_base = x_cur; /* not threadsafe, but its like libevent works */
ev->ev_fd = fd;
ev->ev_events = events;
ev->ev_pri = 0;
ev->ev_callback = cb;
ev->ev_arg = arg;
ev->ev_res = 0;
}
int event_once (int fd, short events, void (*cb)(int, short, void *), void *arg, struct timeval *tv)
{
return event_base_once (x_cur, fd, events, cb, arg, tv);
}
int event_add (struct event *ev, struct timeval *tv)
{
dLOOPev;
/* disable all watchers */
event_del (ev);
if (ev->ev_events & EV_SIGNAL)
{
ev_signal_set (&ev->iosig.sig, ev->ev_fd);
ev_signal_start (EV_A_ &ev->iosig.sig);
}
else if (ev->ev_events & (EV_READ | EV_WRITE))
{
ev_io_set (&ev->iosig.io, ev->ev_fd, ev->ev_events & (EV_READ | EV_WRITE));
ev_io_start (EV_A_ &ev->iosig.io);
}
if (tv)
{
ev_timer_set (&ev->to, tv_get (tv), 0.);
ev_timer_start (EV_A_ &ev->to);
}
return 0;
}
int event_del (struct event *ev)
{
dLOOPev;
if (ev->ev_events & EV_SIGNAL)
{
/* sig */
if (ev_is_active (&ev->iosig.sig))
ev_signal_stop (EV_A_ &ev->iosig.sig);
}
else
{
/* io */
if (ev_is_active (&ev->iosig.io))
ev_io_stop (EV_A_ &ev->iosig.io);
}
if (ev_is_active (&ev->to))
ev_timer_stop (EV_A_ &ev->to);
return 0;
}
int event_pending (struct event *ev, short events, struct timeval *tv)
{
dLOOPev;
short revents = 0;
if (ev->ev_events & EV_SIGNAL)
{
/* sig */
if (ev->iosig.sig.pending)
revents |= EV_SIGNAL;
}
else
{
/* io */
if (ev->iosig.io.pending)
revents |= ev->ev_events & (EV_READ | EV_WRITE);
}
if (ev->to.pending)
{
revents |= EV_TIMEOUT;
if (tv)
tv_set (tv, ev_now (EV_A)); /* not sure if this is right :) */
}
return events & revents;
}
int event_priority_init (int npri)
{
return event_base_priority_init (x_cur, npri);
}
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)
{
dLOOPbase;
ev_loop (EV_A_ flags);
return 0;
}
int event_base_dispatch (struct event_base *base)
{
return event_base_loop (base, 0);
}
static void
x_loopexit_cb (int revents, void *base)
{
dLOOPbase;
ev_unloop (EV_A_ EVUNLOOP_ONCE);
}
int event_base_loopexit (struct event_base *base, struct timeval *tv)
{
dLOOPbase;
ev_tstamp after = tv_get (tv);
ev_once (EV_A_ -1, 0, after >= 0. ? after : 0., x_loopexit_cb, (void *)base);
return -1;
}
struct x_once
{
int fd;
void (*cb)(int, short, void *);
void *arg;
};
static void
x_once_cb (int revents, void *arg)
{
struct x_once *once = arg;
once->cb (once->fd, revents, once->arg);
free (once);
}
int event_base_once (struct event_base *base, int fd, short events, void (*cb)(int, short, void *), void *arg, struct timeval *tv)
{
dLOOPbase;
struct x_once *once = malloc (sizeof (struct x_once));
if (!once)
return -1;
once->fd = fd;
once->cb = cb;
once->arg = arg;
ev_once (EV_A_ fd, events & (EV_READ | EV_WRITE), tv_get (tv), x_once_cb, (void *)once);
return 0;
}
int event_base_priority_init (struct event_base *base, int npri)
{
/*dLOOPbase;*/
return 0;
}