1 EMBEDDING THE LIBEV CODE INTO YOUR OWN PROGRAMS
3 Instead of building the libev library you cna also include the code
4 as-is into your programs. To update, you only have to copy a few files
11 To include only the libev core (all the ev_* functions):
13 #define EV_STANDALONE 1
16 This will automatically include ev.h, too, and should be done in a
17 single C source file only to provide the function implementations. To
18 use it, do the same for ev.h in all users:
20 #define EV_STANDALONE 1
23 You need the following files in your source tree, or in a directory
24 in your include path (e.g. in libev/ when using -Ilibev):
31 To include the libevent compatibility API, also include:
35 in the file including "ev.c", and:
39 in the files that want to use the libevent API. This also includes "ev.h".
41 You need the following additional files for this:
48 Libev can be configured via a variety of preprocessor symbols you have to define
49 before including any of its files. The default is not to build for mulciplicity
50 and only include the select backend.
54 Must always be "1", which keeps libev from including config.h or
55 other files, and it also defines dummy implementations for some
56 libevent functions (such as logging, which is not supported). It
57 will also not define any of the structs usually found in "event.h"
58 that are not directly supported by libev code alone.
62 If undefined or defined to be "1", libev will try to detect the
63 availability of the monotonic clock option at both compiletime and
64 runtime. Otherwise no use of the monotonic clock option will be
69 If defined to be "1", libev will try to detect the availability
70 of the realtime clock option at compiletime (and assume its
71 availability at runtime if successful). Otherwise no use of the
72 realtime clock option will be attempted. This effectively replaces
73 gettimeofday by clock_get (CLOCK_REALTIME, ...) and will not normally
78 If undefined or defined to be "1", libev will compile in support
79 for the select(2) backend. No attempt at autodetection will be
80 done: if no other method takes over, select will be it. Otherwise
81 the select backend will not be compiled in.
85 If defined to be "1", libev will compile in support for the poll(2)
86 backend. No attempt at autodetection will be done. poll usually
87 performs worse than select, so its not enabled by default (it is
88 also slightly less portable).
92 If defined to be "1", libev will compile in support for the Linux
93 epoll backend. Its availability will be detected at runtime,
94 otherwise another method will be used as fallback. This is the
95 preferred backend for GNU/Linux systems.
99 If defined to be "1", libev will compile in support for the BSD
100 style kqueue backend. Its availability will be detected at runtime,
101 otherwise another method will be used as fallback. This is the
102 preferred backend for BSD and BSd-like systems. Darwin brokenness
103 will be detected at runtime and routed around by disabling this
108 By default, all watchers have a "void *data" member. By redefining
109 this macro to a something else you can include more and other types
110 of members. You have to define it each time you include one of the
111 files, though, and it must be identical each time.
113 For example, the perl EV module uses this:
116 SV *self; /* contains this struct */ \
121 If defined to be "0", then "ev.h" will not define any function
122 prototypes, but still define all the structs and other
123 symbols. This is occasionally useful.
127 If undefined or defined to "1", then all event-loop-specific
128 functions will have the "struct ev_loop *" as first argument, and
129 you can create additional independent event loops. Otherwise there
130 will be no support for multiple event loops and there is no first
131 event loop pointer argument. Instead, all functions act on the
136 For a real-world example of a program the includes libev verbatim, you
137 can have a look at the EV perl module (http://software.schmorp.de/pkg/EV.html).
138 It has the libev files in the liev/ subdirectory and includes them in the
139 EV.xs files. Only this file will be compiled.