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This commit is contained in:
Marc Alexander Lehmann 2008-04-06 09:53:16 +00:00
parent c1e4421809
commit 10a3cd7572
6 changed files with 120 additions and 26 deletions
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4
Changes
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@ -1,5 +1,9 @@
Revision history for libev, a high-performance and full-featured event loop.
- added linux eventfd support.
- try to autodetect epoll and inotify support
by libc header version if not using autoconf.
3.2 Wed Apr 2 17:11:19 CEST 2008
- fix a 64 bit overflow issue in the select backend,
by using fd_mask instead of int for the mask.

111
ev.c
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@ -41,6 +41,7 @@
extern "C" {
#endif
/* this big block deduces configuration from config.h */
#ifndef EV_STANDALONE
# ifdef EV_CONFIG_H
# include EV_CONFIG_H
@ -120,6 +121,14 @@ extern "C" {
# endif
# endif
# ifndef EV_USE_EVENTFD
# if HAVE_EVENTFD
# define EV_USE_EVENTFD 1
# else
# define EV_USE_EVENTFD 0
# endif
# endif
#endif
#include <math.h>
@ -154,7 +163,7 @@ extern "C" {
# endif
#endif
/**/
/* this block tries to deduce configuration from header-defined symbols and defaults */
#ifndef EV_USE_MONOTONIC
# define EV_USE_MONOTONIC 0
@ -181,7 +190,11 @@ extern "C" {
#endif
#ifndef EV_USE_EPOLL
# define EV_USE_EPOLL 0
# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
# define EV_USE_EPOLL 1
# else
# define EV_USE_EPOLL 0
# endif
#endif
#ifndef EV_USE_KQUEUE
@ -193,7 +206,11 @@ extern "C" {
#endif
#ifndef EV_USE_INOTIFY
# define EV_USE_INOTIFY 0
# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
# define EV_USE_INOTIFY 1
# else
# define EV_USE_INOTIFY 0
# endif
#endif
#ifndef EV_PID_HASHSIZE
@ -212,7 +229,15 @@ extern "C" {
# endif
#endif
/**/
#ifndef EV_USE_EVENTFD
# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
# define EV_USE_EVENTFD 1
# else
# define EV_USE_EVENTFD 0
# endif
#endif
/* this block fixes any misconfiguration where we know we run into trouble otherwise */
#ifndef CLOCK_MONOTONIC
# undef EV_USE_MONOTONIC
@ -243,6 +268,11 @@ extern "C" {
# include <winsock.h>
#endif
#if EV_USE_EVENTFD
/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
int eventfd (unsigned int initval, int flags);
#endif
/**/
/*
@ -804,13 +834,24 @@ evpipe_init (EV_P)
{
if (!ev_is_active (&pipeev))
{
while (pipe (evpipe))
syserr ("(libev) error creating signal/async pipe");
#if EV_USE_EVENTFD
if ((evfd = eventfd (0, 0)) >= 0)
{
evpipe [0] = -1;
fd_intern (evfd);
ev_io_set (&pipeev, evfd, EV_READ);
}
else
#endif
{
while (pipe (evpipe))
syserr ("(libev) error creating signal/async pipe");
fd_intern (evpipe [0]);
fd_intern (evpipe [1]);
fd_intern (evpipe [0]);
fd_intern (evpipe [1]);
ev_io_set (&pipeev, evpipe [0], EV_READ);
}
ev_io_set (&pipeev, evpipe [0], EV_READ);
ev_io_start (EV_A_ &pipeev);
ev_unref (EV_A); /* watcher should not keep loop alive */
}
@ -824,7 +865,16 @@ evpipe_write (EV_P_ EV_ATOMIC_T *flag)
int old_errno = errno; /* save errno because write might clobber it */
*flag = 1;
write (evpipe [1], &old_errno, 1);
#if EV_USE_EVENTFD
if (evfd >= 0)
{
uint64_t counter = 1;
write (evfd, &counter, sizeof (uint64_t));
}
else
#endif
write (evpipe [1], &old_errno, 1);
errno = old_errno;
}
@ -833,10 +883,18 @@ evpipe_write (EV_P_ EV_ATOMIC_T *flag)
static void
pipecb (EV_P_ ev_io *iow, int revents)
{
{
int dummy;
read (evpipe [0], &dummy, 1);
}
#if EV_USE_EVENTFD
if (evfd >= 0)
{
uint64_t counter = 1;
read (evfd, &counter, sizeof (uint64_t));
}
else
#endif
{
char dummy;
read (evpipe [0], &dummy, 1);
}
if (gotsig && ev_is_default_loop (EV_A))
{
@ -1141,8 +1199,16 @@ loop_destroy (EV_P)
ev_ref (EV_A); /* signal watcher */
ev_io_stop (EV_A_ &pipeev);
close (evpipe [0]); evpipe [0] = 0;
close (evpipe [1]); evpipe [1] = 0;
#if EV_USE_EVENTFD
if (evfd >= 0)
close (evfd);
#endif
if (evpipe [0] >= 0)
{
close (evpipe [0]);
close (evpipe [1]);
}
}
#if EV_USE_INOTIFY
@ -1226,8 +1292,17 @@ loop_fork (EV_P)
ev_ref (EV_A);
ev_io_stop (EV_A_ &pipeev);
close (evpipe [0]);
close (evpipe [1]);
#if EV_USE_EVENTFD
if (evfd >= 0)
close (evfd);
#endif
if (evpipe [0] >= 0)
{
close (evpipe [0]);
close (evpipe [1]);
}
evpipe_init (EV_A);
/* now iterate over everything, in case we missed something */

22
ev.pod
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@ -2739,9 +2739,9 @@ For this of course you need the m4 file:
=head2 PREPROCESSOR SYMBOLS/MACROS
Libev can be configured via a variety of preprocessor symbols you have to define
before including any of its files. The default is not to build for multiplicity
and only include the select backend.
Libev can be configured via a variety of preprocessor symbols you have to
define before including any of its files. The default in the absense of
autoconf is noted for every option.
=over 4
@ -2777,6 +2777,14 @@ note about libraries in the description of C<EV_USE_MONOTONIC>, though.
If defined to be C<1>, libev will assume that C<nanosleep ()> is available
and will use it for delays. Otherwise it will use C<select ()>.
=item EV_USE_EVENTFD
If defined to be C<1>, then libev will assume that C<eventfd ()> is
available and will probe for kernel support at runtime. This will improve
C<ev_signal> and C<ev_async> performance and reduce resource consumption.
If undefined, it will be enabled if the headers indicate GNU/Linux + Glibc
2.7 or newer, otherwise disabled.
=item EV_USE_SELECT
If undefined or defined to be C<1>, libev will compile in support for the
@ -2822,8 +2830,9 @@ takes precedence over select.
If defined to be C<1>, libev will compile in support for the Linux
C<epoll>(7) backend. Its availability will be detected at runtime,
otherwise another method will be used as fallback. This is the
preferred backend for GNU/Linux systems.
otherwise another method will be used as fallback. This is the preferred
backend for GNU/Linux systems. If undefined, it will be enabled if the
headers indicate GNU/Linux + Glibc 2.4 or newer, otherwise disabled.
=item EV_USE_KQUEUE
@ -2852,7 +2861,8 @@ reserved for future expansion, works like the USE symbols above.
If defined to be C<1>, libev will compile in support for the Linux inotify
interface to speed up C<ev_stat> watchers. Its actual availability will
be detected at runtime.
be detected at runtime. If undefined, it will be enabled if the headers
indicate GNU/Linux + Glibc 2.4 or newer, otherwise disabled.
=item EV_ATOMIC_T

3
ev_vars.h
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@ -55,6 +55,9 @@ VARx(ev_tstamp, backend_fudge) /* assumed typical timer resolution */
VAR (backend_modify, void (*backend_modify)(EV_P_ int fd, int oev, int nev))
VAR (backend_poll , void (*backend_poll)(EV_P_ ev_tstamp timeout))
#if EV_USE_EVENTFD || EV_GENWRAP
VARx(int, evfd)
#endif
VAR (evpipe, int evpipe [2])
VARx(ev_io, pipeev)

2
ev_wrap.h
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@ -13,6 +13,7 @@
#define backend_fudge ((loop)->backend_fudge)
#define backend_modify ((loop)->backend_modify)
#define backend_poll ((loop)->backend_poll)
#define evfd ((loop)->evfd)
#define evpipe ((loop)->evpipe)
#define pipeev ((loop)->pipeev)
#define curpid ((loop)->curpid)
@ -84,6 +85,7 @@
#undef backend_fudge
#undef backend_modify
#undef backend_poll
#undef evfd
#undef evpipe
#undef pipeev
#undef curpid

4
libev.m4
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@ -2,9 +2,9 @@ dnl this file is part of libev, do not make local modifications
dnl http://software.schmorp.de/pkg/libev
dnl libev support
AC_CHECK_HEADERS(sys/inotify.h sys/epoll.h sys/event.h sys/queue.h port.h poll.h sys/select.h)
AC_CHECK_HEADERS(sys/inotify.h sys/epoll.h sys/event.h sys/queue.h port.h poll.h sys/select.h sys/eventfd.h)
AC_CHECK_FUNCS(inotify_init epoll_ctl kqueue port_create poll select)
AC_CHECK_FUNCS(inotify_init epoll_ctl kqueue port_create poll select eventfd)
AC_CHECK_FUNC(clock_gettime, [], [
if test -z "$LIBEV_M4_AVOID_LIBRT"; then