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.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
done: if no other method takes over, select will be it. Otherwise
the select backend will not be compiled in.
+ EV_SELECT_USE_WIN32_HANDLES
+
+ When defined to 1, the select backend will assume that select
+ doesn'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. 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)
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_H
- For example, the perl EV module uses this:
+ 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.
- #define EV_COMMON \
- SV *self; /* contains this struct */ \
- SV *cb_sv, *fh;
+ 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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