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more minimal tuning, add truly minimal example

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master
Marc Alexander Lehmann 13 years ago
parent c3b0f892af
commit b7dea53d18
4 changed files with 116 additions and 27 deletions
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4
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@ -1,8 +1,9 @@
Revision history for libev, a high-performance and full-featured event loop.
TODO: accept() documentation
- ev_embed_stop did not correctly stop the watcher (very good
testcase by Vladimir Timofeev).
- applied win32 fixes by Michael Lenaghan.
- applied win32 fixes by Michael Lenaghan (also James Mansion).
- remove dependency on sys/queue.h on freebsd (patch by Vanilla Hsu).
- configure now prepends -O3, not appends it, so one can still
override it.
@ -14,6 +15,7 @@ Revision history for libev, a high-performance and full-featured event loop.
- implement EV_AVOID_STDIO option.
- do not use sscanf to parse linux version number (smaller, faster,
no sscanf dependency).
- new EV_CHILD_ENABLE and EV_SIGNAL_ENABLE configurable settings.
3.9 Thu Dec 31 07:59:59 CET 2009
- signalfd is no longer used by default and has to be requested

63
ev.c
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@ -209,12 +209,13 @@ extern "C" {
#elif defined (MAX_SIG)
# define EV_NSIG (MAX_SIG+1)
#elif defined (SIGARRAYSIZE)
# define EV_NSIG SIGARRAYSIZE /* Assume ary[SIGARRAYSIZE] */
# define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
#elif defined (_sys_nsig)
# define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
#else
# error "unable to find value for NSIG, please report"
/* to make it compile regardless, just remove the above line */
/* to make it compile regardless, just remove the above line, */
/* but consider reporting it, too! :) */
# define EV_NSIG 65
#endif
@ -994,7 +995,7 @@ fd_kill (EV_P_ int fd)
}
}
/* check whether the given fd is atcually valid, for error recovery */
/* check whether the given fd is actually valid, for error recovery */
inline_size int
fd_valid (int fd)
{
@ -1046,6 +1047,20 @@ fd_rearm_all (EV_P)
}
}
/* used to prepare libev internal fd's */
/* this is not fork-safe */
inline_speed void
fd_intern (int fd)
{
#ifdef _WIN32
unsigned long arg = 1;
ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
#else
fcntl (fd, F_SETFD, FD_CLOEXEC);
fcntl (fd, F_SETFL, O_NONBLOCK);
#endif
}
/*****************************************************************************/
/*
@ -1207,26 +1222,14 @@ static ANSIG signals [EV_NSIG - 1];
/*****************************************************************************/
/* used to prepare libev internal fd's */
/* this is not fork-safe */
inline_speed void
fd_intern (int fd)
{
#ifdef _WIN32
unsigned long arg = 1;
ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
#else
fcntl (fd, F_SETFD, FD_CLOEXEC);
fcntl (fd, F_SETFL, O_NONBLOCK);
#endif
}
#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
static void noinline
evpipe_init (EV_P)
{
if (!ev_is_active (&pipe_w))
{
#if EV_USE_EVENTFD
# if EV_USE_EVENTFD
evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
if (evfd < 0 && errno == EINVAL)
evfd = eventfd (0, 0);
@ -1238,7 +1241,7 @@ evpipe_init (EV_P)
ev_io_set (&pipe_w, evfd, EV_READ);
}
else
#endif
# endif
{
while (pipe (evpipe))
ev_syserr ("(libev) error creating signal/async pipe");
@ -1259,6 +1262,7 @@ evpipe_write (EV_P_ EV_ATOMIC_T *flag)
if (!*flag)
{
int old_errno = errno; /* save errno because write might clobber it */
char dummy;
*flag = 1;
@ -1270,7 +1274,7 @@ evpipe_write (EV_P_ EV_ATOMIC_T *flag)
}
else
#endif
write (evpipe [1], &old_errno, 1);
write (evpipe [1], &dummy, 1);
errno = old_errno;
}
@ -1381,12 +1385,13 @@ sigfdcb (EV_P_ ev_io *iow, int revents)
}
#endif
#endif
/*****************************************************************************/
#if EV_CHILD_ENABLE
static WL childs [EV_PID_HASHSIZE];
#ifndef _WIN32
static ev_signal childev;
#ifndef WIFCONTINUED
@ -1664,8 +1669,10 @@ loop_init (EV_P_ unsigned int flags)
ev_prepare_init (&pending_w, pendingcb);
#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
ev_init (&pipe_w, pipecb);
ev_set_priority (&pipe_w, EV_MAXPRI);
#endif
}
}
@ -1925,8 +1932,10 @@ ev_loop_verify (EV_P)
array_verify (EV_A_ (W *)checks, checkcnt);
# if 0
#if EV_CHILD_ENABLE
for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
#endif
# endif
#endif
}
@ -1952,7 +1961,7 @@ ev_default_loop (unsigned int flags)
if (ev_backend (EV_A))
{
#ifndef _WIN32
#if EV_CHILD_ENABLE
ev_signal_init (&childev, childcb, SIGCHLD);
ev_set_priority (&childev, EV_MAXPRI);
ev_signal_start (EV_A_ &childev);
@ -1975,7 +1984,7 @@ ev_default_destroy (void)
ev_default_loop_ptr = 0;
#ifndef _WIN32
#if EV_CHILD_ENABLE
ev_ref (EV_A); /* child watcher */
ev_signal_stop (EV_A_ &childev);
#endif
@ -2727,6 +2736,8 @@ ev_periodic_again (EV_P_ ev_periodic *w)
# define SA_RESTART 0
#endif
#if EV_SIGNAL_ENABLE
void noinline
ev_signal_start (EV_P_ ev_signal *w)
{
@ -2842,6 +2853,10 @@ ev_signal_stop (EV_P_ ev_signal *w)
EV_FREQUENT_CHECK;
}
#endif
#if EV_CHILD_ENABLE
void
ev_child_start (EV_P_ ev_child *w)
{
@ -2874,6 +2889,8 @@ ev_child_stop (EV_P_ ev_child *w)
EV_FREQUENT_CHECK;
}
#endif
#if EV_STAT_ENABLE
# ifdef _WIN32

27
ev.h
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@ -74,14 +74,26 @@ typedef double ev_tstamp;
# define EV_FORK_ENABLE 1
#endif
#ifndef EV_EMBED_ENABLE
# define EV_EMBED_ENABLE 1
#ifndef EV_SIGNAL_ENABLE
# define EV_SIGNAL_ENABLE 1
#endif
#ifndef EV_CHILD_ENABLE
# ifdef _WIN32
# define EV_CHILD_ENABLE 0
# else
# define EV_CHILD_ENABLE 1
#endif
#endif
#ifndef EV_ASYNC_ENABLE
# define EV_ASYNC_ENABLE 1
#endif
#ifndef EV_EMBED_ENABLE
# define EV_EMBED_ENABLE 1
#endif
#ifndef EV_WALK_ENABLE
# define EV_WALK_ENABLE 0 /* not yet */
#endif
@ -93,6 +105,11 @@ typedef double ev_tstamp;
/*****************************************************************************/
#if EV_CHILD_ENABLE && !EV_SIGNAL_ENABLE
# undef EV_SIGNAL_ENABLE
# define EV_SIGNAL_ENABLE 1
#endif
#if EV_STAT_ENABLE
# ifdef _WIN32
# include <time.h>
@ -632,7 +649,9 @@ void ev_resume (EV_P);
/* accepts any ev_watcher type */
void ev_feed_event (EV_P_ void *w, int revents);
void ev_feed_fd_event (EV_P_ int fd, int revents);
#if EV_SIGNAL_ENABLE
void ev_feed_signal_event (EV_P_ int signum);
#endif
void ev_invoke (EV_P_ void *w, int revents);
int ev_clear_pending (EV_P_ void *w);
@ -653,12 +672,16 @@ void ev_periodic_again (EV_P_ ev_periodic *w);
#endif
/* only supported in the default loop */
#if EV_SIGNAL_ENABLE
void ev_signal_start (EV_P_ ev_signal *w);
void ev_signal_stop (EV_P_ ev_signal *w);
#endif
/* only supported in the default loop */
# if EV_CHILD_ENABLE
void ev_child_start (EV_P_ ev_child *w);
void ev_child_stop (EV_P_ ev_child *w);
# endif
# if EV_STAT_ENABLE
void ev_stat_start (EV_P_ ev_stat *w);

49
ev.pod
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@ -3868,11 +3868,21 @@ defined to be C<0>, then they are not.
If undefined or defined to be C<1>, then fork watchers are supported. If
defined to be C<0>, then they are not.
=item EV_SIGNAL_ENABLE
If undefined or defined to be C<1>, then signal watchers are supported. If
defined to be C<0>, then they are not.
=item EV_ASYNC_ENABLE
If undefined or defined to be C<1>, then async watchers are supported. If
defined to be C<0>, then they are not.
=item EV_CHILD_ENABLE
If undefined or defined to be C<1> (and C<_WIN32> is not defined), then
child watchers are supported. If defined to be C<0>, then they are not.
=item EV_MINIMAL
If you need to shave off some kilobytes of code at the expense of some
@ -3883,13 +3893,50 @@ the default 4-heap.
You can save even more by disabling watcher types you do not need
and setting C<EV_MAXPRI> == C<EV_MINPRI>. Also, disabling C<assert>
(C<-DNDEBUG>) will usually reduce code size a lot.
(C<-DNDEBUG>) will usually reduce code size a lot. Disabling inotify,
eventfd and signalfd will further help, and disabling backends one doesn't
need (e.g. poll, epoll, kqueue, ports) will help further.
Defining C<EV_MINIMAL> to C<2> will additionally reduce the core API to
provide a bare-bones event library. See C<ev.h> for details on what parts
of the API are still available, and do not complain if this subset changes
over time.
This example set of settings reduces the compiled size of libev from 24Kb
to 8Kb on my GNU/Linux amd64 system (and leaves little in - there is also
an effect on the amount of memory used). With an intelligent-enough linker
further unused functions might be left out as well automatically.
// tuning and API changes
#define EV_MINIMAL 2
#define EV_MULTIPLICITY 0
#define EV_MINPRI 0
#define EV_MAXPRI 0
// OS-specific backends
#define EV_USE_INOTIFY 0
#define EV_USE_EVENTFD 0
#define EV_USE_SIGNALFD 0
#define EV_USE_REALTIME 0
#define EV_USE_MONOTONIC 0
#define EV_USE_CLOCK_SYSCALL 0
// disable all backends except select
#define EV_USE_POLL 0
#define EV_USE_PORT 0
#define EV_USE_KQUEUE 0
#define EV_USE_EPOLL 0
// disable all watcher types that cna be disabled
#define EV_STAT_ENABLE 0
#define EV_PERIODIC_ENABLE 0
#define EV_IDLE_ENABLE 0
#define EV_FORK_ENABLE 0
#define EV_SIGNAL_ENABLE 0
#define EV_CHILD_ENABLE 0
#define EV_ASYNC_ENABLE 0
#define EV_EMBED_ENABLE 0
=item EV_AVOID_STDIO
If this is set to C<1> at compiletime, then libev will avoid using stdio

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