Browse Source

3.51

master rel-3.51
Marc Alexander Lehmann 12 years ago
parent
commit
96adbfa1c4
3 changed files with 78 additions and 34 deletions
  1. +1
    -0
      Changes
  2. +1
    -1
      configure.ac
  3. +76
    -33
      ev.3

+ 1
- 0
Changes View File

@ -1,5 +1,6 @@
Revision history for libev, a high-performance and full-featured event loop.
3.51 Wed Dec 24 23:00:11 CET 2008
- fix a bug where an inotify watcher was added twice, causing
freezes on hash collisions (reported and analysed by Graham Leggett).
- new config symbol, EV_USE_CLOCK_SYSCALL, to make libev use


+ 1
- 1
configure.ac View File

@ -1,7 +1,7 @@
AC_INIT
AC_CONFIG_SRCDIR([ev_epoll.c])
AM_INIT_AUTOMAKE(libev,3.49)
AM_INIT_AUTOMAKE(libev,3.51)
AC_CONFIG_HEADERS([config.h])
AM_MAINTAINER_MODE


+ 76
- 33
ev.3 View File

@ -132,7 +132,7 @@
.\" ========================================================================
.\"
.IX Title "LIBEV 3"
.TH LIBEV 3 "2008-11-17" "libev-3.49" "libev - high performance full featured event loop"
.TH LIBEV 3 "2008-12-14" "libev-3.51" "libev - high performance full featured event loop"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
@ -184,7 +184,7 @@ libev \- a high performance full\-featured event loop written in C
\& main (void)
\& {
\& // use the default event loop unless you have special needs
\& ev_loop *loop = ev_default_loop (0);
\& struct ev_loop *loop = ev_default_loop (0);
\&
\& // initialise an io watcher, then start it
\& // this one will watch for stdin to become readable
@ -588,8 +588,8 @@ While nominally embeddable in other event loops, this doesn't work
everywhere, so you might need to test for this. And since it is broken
almost everywhere, you should only use it when you have a lot of sockets
(for which it usually works), by embedding it into another event loop
(e.g. \f(CW\*(C`EVBACKEND_SELECT\*(C'\fR or \f(CW\*(C`EVBACKEND_POLL\*(C'\fR) and, did I mention it,
using it only for sockets.
(e.g. \f(CW\*(C`EVBACKEND_SELECT\*(C'\fR or \f(CW\*(C`EVBACKEND_POLL\*(C'\fR (but \f(CW\*(C`poll\*(C'\fR is of course
also broken on \s-1OS\s0 X)) and, did I mention it, using it only for sockets.
.Sp
This backend maps \f(CW\*(C`EV_READ\*(C'\fR into an \f(CW\*(C`EVFILT_READ\*(C'\fR kevent with
\&\f(CW\*(C`NOTE_EOF\*(C'\fR, and \f(CW\*(C`EV_WRITE\*(C'\fR into an \f(CW\*(C`EVFILT_WRITE\*(C'\fR kevent with
@ -2166,7 +2166,7 @@ the process. The exception are \f(CW\*(C`ev_stat\*(C'\fR watchers \- those call
.PP
For local paths, this usually doesn't matter: unless the system is very
busy or the intervals between stat's are large, a stat call will be fast,
as the path data is suually in memory already (except when starting the
as the path data is usually in memory already (except when starting the
watcher).
.PP
For networked file systems, calling \f(CW\*(C`stat ()\*(C'\fR can block an indefinite
@ -2582,24 +2582,20 @@ and even priorities and idle watchers might have too much overhead. In
this case you would put all the high priority stuff in one loop and all
the rest in a second one, and embed the second one in the first.
.PP
As long as the watcher is active, the callback will be invoked every time
there might be events pending in the embedded loop. The callback must then
call \f(CW\*(C`ev_embed_sweep (mainloop, watcher)\*(C'\fR to make a single sweep and invoke
their callbacks (you could also start an idle watcher to give the embedded
loop strictly lower priority for example). You can also set the callback
to \f(CW0\fR, in which case the embed watcher will automatically execute the
embedded loop sweep.
.PP
As long as the watcher is started it will automatically handle events. The
callback will be invoked whenever some events have been handled. You can
set the callback to \f(CW0\fR to avoid having to specify one if you are not
interested in that.
.PP
Also, there have not currently been made special provisions for forking:
when you fork, you not only have to call \f(CW\*(C`ev_loop_fork\*(C'\fR on both loops,
but you will also have to stop and restart any \f(CW\*(C`ev_embed\*(C'\fR watchers
yourself \- but you can use a fork watcher to handle this automatically,
and future versions of libev might do just that.
As long as the watcher is active, the callback will be invoked every
time there might be events pending in the embedded loop. The callback
must then call \f(CW\*(C`ev_embed_sweep (mainloop, watcher)\*(C'\fR to make a single
sweep and invoke their callbacks (the callback doesn't need to invoke the
\&\f(CW\*(C`ev_embed_sweep\*(C'\fR function directly, it could also start an idle watcher
to give the embedded loop strictly lower priority for example).
.PP
You can also set the callback to \f(CW0\fR, in which case the embed watcher
will automatically execute the embedded loop sweep whenever necessary.
.PP
Fork detection will be handled transparently while the \f(CW\*(C`ev_embed\*(C'\fR watcher
is active, i.e., the embedded loop will automatically be forked when the
embedding loop forks. In other cases, the user is responsible for calling
\&\f(CW\*(C`ev_loop_fork\*(C'\fR on the embedded loop.
.PP
Unfortunately, not all backends are embeddable: only the ones returned by
\&\f(CW\*(C`ev_embeddable_backends\*(C'\fR are, which, unfortunately, does not include any
@ -3018,6 +3014,37 @@ Example: simple class declaration and watcher initialisation
\& ev::io iow;
\& iow.set <myclass, &myclass::io_cb> (&obj);
.Ve
.IP "w\->set (object *)" 4
.IX Item "w->set (object *)"
This is an \fBexperimental\fR feature that might go away in a future version.
.Sp
This is a variation of a method callback \- leaving out the method to call
will default the method to \f(CW\*(C`operator ()\*(C'\fR, which makes it possible to use
functor objects without having to manually specify the \f(CW\*(C`operator ()\*(C'\fR all
the time. Incidentally, you can then also leave out the template argument
list.
.Sp
The \f(CW\*(C`operator ()\*(C'\fR method prototype must be \f(CW\*(C`void operator ()(watcher &w,
int revents)\*(C'\fR.
.Sp
See the method\-\f(CW\*(C`set\*(C'\fR above for more details.
.Sp
Example: use a functor object as callback.
.Sp
.Vb 7
\& struct myfunctor
\& {
\& void operator() (ev::io &w, int revents)
\& {
\& ...
\& }
\& }
\&
\& myfunctor f;
\&
\& ev::io w;
\& w.set (&f);
.Ve
.IP "w\->set<function> (void *data = 0)" 4
.IX Item "w->set<function> (void *data = 0)"
Also sets a callback, but uses a static method or plain function as
@ -3117,6 +3144,9 @@ Tony Arcieri has written a ruby extension that offers access to a subset
of the libev \s-1API\s0 and adds file handle abstractions, asynchronous \s-1DNS\s0 and
more on top of it. It can be found via gem servers. Its homepage is at
<http://rev.rubyforge.org/>.
.Sp
Roger Pack reports that using the link order \f(CW\*(C`\-lws2_32 \-lmsvcrt\-ruby\-190\*(C'\fR
makes rev work even on mingw.
.IP "D" 4
.IX Item "D"
Leandro Lucarella has written a D language binding (\fIev.d\fR) for libev, to
@ -3309,15 +3339,18 @@ keeps libev from including \fIconfig.h\fR, and it also defines dummy
implementations for some libevent functions (such as logging, which is not
supported). It will also not define any of the structs usually found in
\&\fIevent.h\fR that are not directly supported by the libev core alone.
.Sp
In stanbdalone mode, libev will still try to automatically deduce the
configuration, but has to be more conservative.
.IP "\s-1EV_USE_MONOTONIC\s0" 4
.IX Item "EV_USE_MONOTONIC"
If defined to be \f(CW1\fR, 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 \f(CW\*(C`clock_gettime\*(C'\fR
function is hiding in (often \fI\-lrt\fR).
function is hiding in (often \fI\-lrt\fR). See also \f(CW\*(C`EV_USE_CLOCK_SYSCALL\*(C'\fR.
.IP "\s-1EV_USE_REALTIME\s0" 4
.IX Item "EV_USE_REALTIME"
If defined to be \f(CW1\fR, libev will try to detect the availability of the
@ -3326,6 +3359,16 @@ runtime if successful). Otherwise no use of the real-time clock option will
be attempted. This effectively replaces \f(CW\*(C`gettimeofday\*(C'\fR by \f(CW\*(C`clock_get
(CLOCK_REALTIME, ...)\*(C'\fR and will not normally affect correctness. See the
note about libraries in the description of \f(CW\*(C`EV_USE_MONOTONIC\*(C'\fR, though.
.IP "\s-1EV_USE_CLOCK_SYSCALL\s0" 4
.IX Item "EV_USE_CLOCK_SYSCALL"
If defined to be \f(CW1\fR, libev will try to use a direct syscall instead
of calling the system-provided \f(CW\*(C`clock_gettime\*(C'\fR function. This option
exists because on GNU/Linux, \f(CW\*(C`clock_gettime\*(C'\fR is in \f(CW\*(C`librt\*(C'\fR, but \f(CW\*(C`librt\*(C'\fR
unconditionally pulls in \f(CW\*(C`libpthread\*(C'\fR, slowing down single-threaded
programs needlessly. Using a direct syscall is slightly slower (in
theory), because no optimised vdso implementation can be used, but avoids
the pthread dependency. Defaults to \f(CW1\fR on GNU/Linux with glibc 2.x or
higher, as it simplifies linking (no need for \f(CW\*(C`\-lrt\*(C'\fR).
.IP "\s-1EV_USE_NANOSLEEP\s0" 4
.IX Item "EV_USE_NANOSLEEP"
If defined to be \f(CW1\fR, libev will assume that \f(CW\*(C`nanosleep ()\*(C'\fR is available
@ -3347,11 +3390,11 @@ will not be compiled in.
.IX Item "EV_SELECT_USE_FD_SET"
If defined to \f(CW1\fR, then the select backend will use the system \f(CW\*(C`fd_set\*(C'\fR
structure. This is useful if libev doesn't compile due to a missing
\&\f(CW\*(C`NFDBITS\*(C'\fR or \f(CW\*(C`fd_mask\*(C'\fR 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 \f(CW\*(C`FD_SETSIZE\*(C'\fR macro, set before compilation, might
influence the size of the \f(CW\*(C`fd_set\*(C'\fR used.
\&\f(CW\*(C`NFDBITS\*(C'\fR or \f(CW\*(C`fd_mask\*(C'\fR 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 \f(CW\*(C`FD_SETSIZE\*(C'\fR macro, set before compilation,
configures the maximum size of the \f(CW\*(C`fd_set\*(C'\fR.
.IP "\s-1EV_SELECT_IS_WINSOCKET\s0" 4
.IX Item "EV_SELECT_IS_WINSOCKET"
When defined to \f(CW1\fR, the select backend will assume that


Loading…
Cancel
Save