mirror of /home/gitosis/repositories/libev.git
*** empty log message ***
This commit is contained in:
Marc Alexander Lehmann
parent
bfcc49b9ef
commit
f3be4c72a3
3
Changes
3
Changes
|
|
@ -1,5 +1,8 @@
|
|||
Revision history for libev, a high-performance and full-featured event loop.
|
||||
|
||||
- new config symbol, EV_USE_CLOCK_SYSCALL, to make libev use
|
||||
a direct syscall - slower, but no dependency on librt et al.
|
||||
|
||||
3.49 Wed Nov 19 11:26:53 CET 2008
|
||||
- ev_stat watchers will now use inotify as a mere hint on
|
||||
kernels <2.6.25, or if the filesystem is not in the
|
||||
|
|
|
|||
29
ev.c
29
ev.c
|
|
@ -49,6 +49,18 @@ extern "C" {
|
|||
# include "config.h"
|
||||
# endif
|
||||
|
||||
# if HAVE_CLOCK_SYSCALL
|
||||
# ifndef EV_USE_CLOCK_SYSCALL
|
||||
# define EV_USE_CLOCK_SYSCALL 1
|
||||
# ifndef EV_USE_REALTIME
|
||||
# define EV_USE_REALTIME 0
|
||||
# endif
|
||||
# ifndef EV_USE_MONOTONIC
|
||||
# define EV_USE_MONOTONIC 1
|
||||
# endif
|
||||
# endif
|
||||
# endif
|
||||
|
||||
# if HAVE_CLOCK_GETTIME
|
||||
# ifndef EV_USE_MONOTONIC
|
||||
# define EV_USE_MONOTONIC 1
|
||||
|
|
@ -166,6 +178,14 @@ extern "C" {
|
|||
|
||||
/* this block tries to deduce configuration from header-defined symbols and defaults */
|
||||
|
||||
#ifndef EV_USE_CLOCK_SYSCALL
|
||||
# if __linux && __GLIBC__ >= 2
|
||||
# define EV_USE_CLOCK_SYSCALL 1
|
||||
# else
|
||||
# define EV_USE_CLOCK_SYSCALL 0
|
||||
# endif
|
||||
#endif
|
||||
|
||||
#ifndef EV_USE_MONOTONIC
|
||||
# if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
|
||||
# define EV_USE_MONOTONIC 1
|
||||
|
|
@ -302,6 +322,15 @@ extern "C" {
|
|||
# include <winsock.h>
|
||||
#endif
|
||||
|
||||
/* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
|
||||
/* which makes programs even slower. might work on other unices, too. */
|
||||
#if EV_USE_CLOCK_SYSCALL
|
||||
# include <syscall.h>
|
||||
# define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
|
||||
# undef EV_USE_MONOTONIC
|
||||
# define EV_USE_MONOTONIC 1
|
||||
#endif
|
||||
|
||||
#if EV_USE_EVENTFD
|
||||
/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
|
||||
# include <stdint.h>
|
||||
|
|
|
|||
36
ev.pod
36
ev.pod
|
|
@ -3001,6 +3001,9 @@ of the libev API and adds file handle abstractions, asynchronous DNS and
|
|||
more on top of it. It can be found via gem servers. Its homepage is at
|
||||
L<http://rev.rubyforge.org/>.
|
||||
|
||||
Roger Pack reports that using the link order C<-lws2_32 -lmsvcrt-ruby-190>
|
||||
makes rev work even on mingw.
|
||||
|
||||
=item D
|
||||
|
||||
Leandro Lucarella has written a D language binding (F<ev.d>) for libev, to
|
||||
|
|
@ -3186,15 +3189,18 @@ implementations for some libevent functions (such as logging, which is not
|
|||
supported). It will also not define any of the structs usually found in
|
||||
F<event.h> that are not directly supported by the libev core alone.
|
||||
|
||||
In stanbdalone mode, libev will still try to automatically deduce the
|
||||
configuration, but has to be more conservative.
|
||||
|
||||
=item EV_USE_MONOTONIC
|
||||
|
||||
If defined to be C<1>, libev will try to detect the availability of the
|
||||
monotonic clock option at both compile time and runtime. Otherwise no use
|
||||
of the monotonic clock option will be attempted. If you enable this, you
|
||||
usually have to link against librt or something similar. Enabling it when
|
||||
the functionality isn't available is safe, though, although you have
|
||||
monotonic clock option at both compile time and runtime. Otherwise no
|
||||
use of the monotonic clock option will be attempted. If you enable this,
|
||||
you usually have to link against librt or something similar. Enabling it
|
||||
when the functionality isn't available is safe, though, although you have
|
||||
to make sure you link against any libraries where the C<clock_gettime>
|
||||
function is hiding in (often F<-lrt>).
|
||||
function is hiding in (often F<-lrt>). See also C<EV_USE_CLOCK_SYSCALL>.
|
||||
|
||||
=item EV_USE_REALTIME
|
||||
|
||||
|
|
@ -3205,6 +3211,16 @@ be attempted. This effectively replaces C<gettimeofday> by C<clock_get
|
|||
(CLOCK_REALTIME, ...)> and will not normally affect correctness. See the
|
||||
note about libraries in the description of C<EV_USE_MONOTONIC>, though.
|
||||
|
||||
=item EV_USE_CLOCK_SYSCALL
|
||||
|
||||
If defined to be C<1>, libev will try to use a direct syscall instead
|
||||
of calling the system-provided C<clock_gettime> function. This option
|
||||
exists because on GNU/Linux, C<clock_gettime> is in C<librt>, but C<librt>
|
||||
unconditionally pulls in C<libpthread>, slowing down single-threaded
|
||||
programs needlessly. Using a direct syscall is slightly slower, because
|
||||
no optimised vdso implementation can be used, but avoids the pthread
|
||||
dependency. Defaults to C<1> on GNU/Linux with glibc 2.x or higher.
|
||||
|
||||
=item EV_USE_NANOSLEEP
|
||||
|
||||
If defined to be C<1>, libev will assume that C<nanosleep ()> is available
|
||||
|
|
@ -3229,11 +3245,11 @@ will not be compiled in.
|
|||
|
||||
If defined to C<1>, then the select backend will use the system C<fd_set>
|
||||
structure. This is useful if libev doesn't compile due to a missing
|
||||
C<NFDBITS> or C<fd_mask> definition or it mis-guesses the bitset layout on
|
||||
exotic systems. This usually limits the range of file descriptors to some
|
||||
low limit such as 1024 or might have other limitations (winsocket only
|
||||
allows 64 sockets). The C<FD_SETSIZE> macro, set before compilation, might
|
||||
influence the size of the C<fd_set> used.
|
||||
C<NFDBITS> or C<fd_mask> definition or it mis-guesses the bitset layout
|
||||
on exotic systems. This usually limits the range of file descriptors to
|
||||
some low limit such as 1024 or might have other limitations (winsocket
|
||||
only allows 64 sockets). The C<FD_SETSIZE> macro, set before compilation,
|
||||
configures the maximum size of the C<fd_set>.
|
||||
|
||||
=item EV_SELECT_IS_WINSOCKET
|
||||
|
||||
|
|
|
|||
14
libev.m4
14
libev.m4
|
|
@ -7,7 +7,19 @@ AC_CHECK_HEADERS(sys/inotify.h sys/epoll.h sys/event.h sys/queue.h port.h poll.h
|
|||
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
|
||||
dnl on linux, try syscall wrapper first
|
||||
if test $(uname) = Linux; then
|
||||
AC_MSG_CHECKING(for clock_gettime syscall)
|
||||
AC_LINK_IFELSE([AC_LANG_PROGRAM(
|
||||
[#include <syscall.h>
|
||||
#include <time.h>],
|
||||
[struct timespec ts; int status = syscall (SYS_clock_gettime, CLOCK_REALTIME, &ts)])],
|
||||
[ac_have_clock_syscall=1
|
||||
AC_DEFINE(HAVE_CLOCK_SYSCALL, 1, "use syscall interface for clock_gettime")
|
||||
AC_MSG_RESULT(yes)],
|
||||
[AC_MSG_RESULT(no)])
|
||||
fi
|
||||
if test -z "$LIBEV_M4_AVOID_LIBRT" && test -z "$ac_have_clock_syscall"; then
|
||||
AC_CHECK_LIB(rt, clock_gettime)
|
||||
unset ac_cv_func_clock_gettime
|
||||
AC_CHECK_FUNCS(clock_gettime)
|
||||
|
|
|
|||
Loading…
Reference in New Issue