EMBEDDING THE LIBEV CODE INTO YOUR OWN PROGRAMS
- Instead of building the libev library you cna also include the code
+ Instead of building the libev library you can also include the code
as-is into your programs. To update, you only have to copy a few files
into your source tree.
FILESETS
+ CORE EVENT LOOP
+
To include only the libev core (all the ev_* functions):
#define EV_STANDALONE 1
This will automatically include ev.h, too, and should be done in a
single C source file only to provide the function implementations. To
- use it, do the same for ev.h in all users:
+ use it, do the same for ev.h in all files wishing to use this API
+ (best done by writing a wrapper around ev.h that you can include
+ instead and where you can put other configuration options):
#define EV_STANDALONE 1
#include "ev.h"
+ Both header files and implementation files can be compiled with a C++
+ compiler (at least, thats a stated goal, and breakage will be treated
+ as a bug).
+
You need the following files in your source tree, or in a directory
in your include path (e.g. in libev/ when using -Ilibev):
ev_vars.h
ev_wrap.h
+ ev_win32.c required on win32 platforms only
+
+ ev_select.c only when select backend is enabled (which is is by default)
+ ev_poll.c only when poll backend is enabled (disabled by default)
+ ev_epoll.c only when the epoll backend is enabled (disabled by default)
+ ev_kqueue.c only when the kqueue backend is enabled (disabled by default)
+ ev_port.c only when the solaris port backend is enabled (disabled by default)
+
+ "ev.c" includes the backend files directly when enabled.
+
+ LIBEVENT COMPATIBILITY API
+
To include the libevent compatibility API, also include:
#include "event.c"
event.h
event.c
+AUTOCONF SUPPORT
+
+ Instead of using EV_STANDALONE=1 and providing your config in whatever
+ way you want, you can also m4_include([libev.m4]) in your configure.ac
+ and leave EV_STANDALONE off. ev.c will then include "config.h" and
+ configure itself accordingly.
+
PREPROCESSOR SYMBOLS
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 mulciplicity
+ before including any of its files. The default is not to build for multiplicity
and only include the select backend.
EV_STANDALONE
EV_USE_MONOTONIC
- If undefined or defined to be "1", libev will try to detect the
- availability of the monotonic clock option at both compiletime and
+ If defined to be "1", libev will try to detect the availability
+ of the monotonic clock option at both compiletime and
runtime. Otherwise no use of the monotonic clock option will be
- attempted.
+ 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.
EV_USE_REALTIME
done: if no other method takes over, select will be it. Otherwise
the select backend will not be compiled in.
+ EV_SELECT_USE_FD_SET
+
+ If defined to 1, then the select backend will use the system fd_set
+ structure. This is useful if libev doesn't compile due to a missing
+ NFDBITS or fd_mask definition or it misguesses 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 FD_SETSIZE macro, set
+ before compilation, might influence the size of the fd_set used.
+
+ EV_SELECT_IS_WINSOCKET
+
+ When defined to 1, the select backend will assume that
+ select/socket/connect etc. don't understand file descriptors but
+ wants osf handles on win32 (this is the case when the select to
+ be used is the winsock select). This means that it will call
+ _get_osfhandle on the fd to convert it to an OS handle. Otherwise,
+ it is assumed that all these functions actually work on fds, even
+ on win32. Should not be defined on non-win32 platforms.
+
EV_USE_POLL
If defined to be "1", libev will compile in support for the poll(2)
- backend. No attempt at autodetection will be done. poll usually
- performs worse than select, so its not enabled by default (it is
- also slightly less portable).
+ backend. Otherwise it will be enabled on non-win32 platforms. It
+ takes precedence over select.
EV_USE_EPOLL
If defined to be "1", libev will compile in support for the BSD
style kqueue backend. Its availability will be detected at runtime,
otherwise another method will be used as fallback. This is the
- preferred backend for BSD and BSd-like systems. Darwin brokenness
+ preferred backend for BSD and BSD-like systems. Darwin brokenness
will be detected at runtime and routed around by disabling this
backend.
- EV_COMMON
-
- By default, all watchers have a "void *data" member. By redefining
- this macro to a something else you can include more and other types
- of members. You have to define it each time you include one of the
- files, though, and it must be identical each time.
+ EV_USE_PORT
- For example, the perl EV module uses this:
+ If defined to be "1", libev will compile in support for the Solaris
+ 10 port style backend. Its availability will be detected at runtime,
+ otherwise another method will be used as fallback. This is the
+ preferred backend for Solaris 10 systems.
- #define EV_COMMON \
- SV *self; /* contains this struct */ \
- SV *cb_sv, *fh;
+ EV_USE_DEVPOLL
+
+ reserved for future expansion, works like the USE symbols above.
+
+ EV_H
+
+ The name of the ev.h header file used to include it. The default
+ if undefined is <ev.h> in event.h and "ev.h" in ev.c. This can
+ be used to virtually rename the ev.h header file in case of
+ conflicts.
+
+ EV_EVENT_H
+
+ Similarly to EV_H, this macro cna be used to override event.c's idea
+ of how the event.h header can be found.
EV_PROTOTYPES
event loop pointer argument. Instead, all functions act on the
single default loop.
+ EV_PERIODICS
+
+ If undefined or defined to be "1", then periodic timers are
+ supported, otherwise not. This saves a few kb of code.
+
+ EV_COMMON
+
+ By default, all watchers have a "void *data" member. By redefining
+ this macro to a something else you can include more and other types
+ of members. You have to define it each time you include one of the
+ files, though, and it must be identical each time.
+
+ For example, the perl EV module uses this:
+
+ #define EV_COMMON \
+ SV *self; /* contains this struct */ \
+ SV *cb_sv, *fh /* note no trailing ";" */
+
+ EV_CB_DECLARE(type)
+ EV_CB_INVOKE(watcher,revents)
+ ev_set_cb(ev,cb)
+
+ Can be used to change the callback member declaration in each
+ watcher, and the way callbacks are invoked and set. Must expand
+ to a struct member definition and a statement, respectively. See
+ the ev.v header file for their default definitions. One possible
+ use for overriding these is to avoid the ev_loop pointer as first
+ argument in all cases, or to use method calls instead of plain
+ function calls in C++.
+
EXAMPLES
For a real-world example of a program the includes libev
verbatim, you can have a look at the EV perl module
(http://software.schmorp.de/pkg/EV.html). It has the libev files in
- the liev/ subdirectory and includes them in the EV/EVAPI.h (public
- interface) and EV.xs (implementation) files. Only EV.xs file will be
- compiled.
+ the libev/ subdirectory and includes them in the EV/EVAPI.h (public
+ interface) and EV.xs (implementation) files. Only the EV.xs file will
+ be compiled.
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