1 EMBEDDING THE LIBEV CODE INTO YOUR OWN PROGRAMS
3 Instead of building the libev library you can also include the code
4 as-is into your programs. To update, you only have to copy a few files
13 To include only the libev core (all the ev_* functions):
15 #define EV_STANDALONE 1
18 This will automatically include ev.h, too, and should be done in a
19 single C source file only to provide the function implementations. To
20 use it, do the same for ev.h in all files wishing to use this API
21 (best done by writing a wrapper around ev.h that you can include
22 instead and where you can put other configuration options):
24 #define EV_STANDALONE 1
27 You need the following files in your source tree, or in a directory
28 in your include path (e.g. in libev/ when using -Ilibev):
36 ev_select.c only when select backend is enabled (which is by default)
37 ev_poll.c only when poll backend is enabled (disabled by default)
38 ev_epoll.c only when the epoll backend is enabled (disabled by default)
39 ev_kqueue.c only when the kqueue backend is enabled (disabled by default)
41 "ev.c" includes the backend files directly when enabled.
43 LIBEVENT COMPATIBILITY API
45 To include the libevent compatibility API, also include:
49 in the file including "ev.c", and:
53 in the files that want to use the libevent API. This also includes "ev.h".
55 You need the following additional files for this:
62 Libev can be configured via a variety of preprocessor symbols you have to define
63 before including any of its files. The default is not to build for mulciplicity
64 and only include the select backend.
68 Must always be "1", which keeps libev from including config.h or
69 other files, and it also defines dummy implementations for some
70 libevent functions (such as logging, which is not supported). It
71 will also not define any of the structs usually found in "event.h"
72 that are not directly supported by libev code alone.
76 If undefined or defined to be "1", libev will try to detect the
77 availability of the monotonic clock option at both compiletime and
78 runtime. Otherwise no use of the monotonic clock option will be
83 If defined to be "1", libev will try to detect the availability
84 of the realtime clock option at compiletime (and assume its
85 availability at runtime if successful). Otherwise no use of the
86 realtime clock option will be attempted. This effectively replaces
87 gettimeofday by clock_get (CLOCK_REALTIME, ...) and will not normally
92 If undefined or defined to be "1", libev will compile in support
93 for the select(2) backend. No attempt at autodetection will be
94 done: if no other method takes over, select will be it. Otherwise
95 the select backend will not be compiled in.
97 EV_SELECT_USE_WIN32_HANDLES
99 When defined to 1, the select backend will assume that select
100 doesn't understand file descriptors but wants osf handles on
101 win32 (this is the case when the select to be used is the winsock
102 select). This means that it will call _get_osfhandle on the fd to
103 convert it to an OS handle. Should not be defined on non-win32
108 If defined to be "1", libev will compile in support for the poll(2)
109 backend. No attempt at autodetection will be done. poll usually
110 performs worse than select, so its not enabled by default (it is
111 also slightly less portable).
115 If defined to be "1", libev will compile in support for the Linux
116 epoll backend. Its availability will be detected at runtime,
117 otherwise another method will be used as fallback. This is the
118 preferred backend for GNU/Linux systems.
122 If defined to be "1", libev will compile in support for the BSD
123 style kqueue backend. Its availability will be detected at runtime,
124 otherwise another method will be used as fallback. This is the
125 preferred backend for BSD and BSd-like systems. Darwin brokenness
126 will be detected at runtime and routed around by disabling this
131 By default, all watchers have a "void *data" member. By redefining
132 this macro to a something else you can include more and other types
133 of members. You have to define it each time you include one of the
134 files, though, and it must be identical each time.
136 For example, the perl EV module uses this:
139 SV *self; /* contains this struct */ \
140 SV *cb_sv, *fh /* note no trailing ";" */
144 If defined to be "0", then "ev.h" will not define any function
145 prototypes, but still define all the structs and other
146 symbols. This is occasionally useful.
150 If undefined or defined to "1", then all event-loop-specific
151 functions will have the "struct ev_loop *" as first argument, and
152 you can create additional independent event loops. Otherwise there
153 will be no support for multiple event loops and there is no first
154 event loop pointer argument. Instead, all functions act on the
159 For a real-world example of a program the includes libev
160 verbatim, you can have a look at the EV perl module
161 (http://software.schmorp.de/pkg/EV.html). It has the libev files in
162 the libev/ subdirectory and includes them in the EV/EVAPI.h (public
163 interface) and EV.xs (implementation) files. Only the EV.xs file will