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Revision 1.4 by root, Tue Nov 6 16:27:10 2007 UTC vs.
Revision 1.21 by root, Sun Nov 11 03:13:07 2007 UTC

1EMBEDDING THE LIBEV CODE INTO YOUR OWN PROGRAMS 1EMBEDDING THE LIBEV CODE INTO YOUR OWN PROGRAMS
2 2
3 Instead of building the libev library you cna also include the code 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 4 as-is into your programs. To update, you only have to copy a few files
5 into your source tree. 5 into your source tree.
6 6
7 This is how it works: 7 This is how it works:
8 8
9FILESETS 9FILESETS
10 10
11 CORE EVENT LOOP
12
11 To include only the libev core (all the ev_* functions): 13 To include only the libev core (all the ev_* functions):
12 14
13 #define EV_STANDALONE 1 15 #define EV_STANDALONE 1
14 #include "ev.c" 16 #include "ev.c"
15 17
16 This will automatically include ev.h, too, and should be done in a 18 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 19 single C source file only to provide the function implementations. To
18 use it, do the same for ev.h in all users: 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):
19 23
20 #define EV_STANDALONE 1 24 #define EV_STANDALONE 1
21 #include "ev.h" 25 #include "ev.h"
26
27 Both header files and implementation files can be compiled with a C++
28 compiler (at least, thats a stated goal, and breakage will be treated
29 as a bug).
22 30
23 You need the following files in your source tree, or in a directory 31 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): 32 in your include path (e.g. in libev/ when using -Ilibev):
25 33
26 ev.h 34 ev.h
27 ev.c 35 ev.c
28 ev_vars.h 36 ev_vars.h
29 ev_wrap.h 37 ev_wrap.h
30 ev_win32.c
31 38
39 ev_win32.c required on win32 platforms only
40
32 ev_select.c only when select backend is enabled (which is by default) 41 ev_select.c only when select backend is enabled (which is is by default)
33 ev_poll.c only when poll backend is enabled (disabled by default) 42 ev_poll.c only when poll backend is enabled (disabled by default)
34 ev_epoll.c only when the epoll backend is enabled (disabled by default) 43 ev_epoll.c only when the epoll backend is enabled (disabled by default)
35 ev_kqueue.c only when the kqueue backend is enabled (disabled by default) 44 ev_kqueue.c only when the kqueue backend is enabled (disabled by default)
36 45
37 "ev.c" includes the backend files directly when enabled. 46 "ev.c" includes the backend files directly when enabled.
38 47
48 LIBEVENT COMPATIBILITY API
49
39 To include the libevent compatibility API, also include: 50 To include the libevent compatibility API, also include:
40 51
41 #include "event.c" 52 #include "event.c"
42 53
43 in the file including "ev.c", and: 54 in the file including "ev.c", and:
… …
49 You need the following additional files for this: 60 You need the following additional files for this:
50 61
51 event.h 62 event.h
52 event.c 63 event.c
53 64
65AUTOCONF SUPPORT
66
67 Instead of using EV_STANDALONE=1 and providing your config in whatever
68 way you want, you can also m4_include([libev.m4]) in your configure.ac
69 and leave EV_STANDALONE off. ev.c will then include "config.h" and
70 configure itself accordingly.
71
54PREPROCESSOR SYMBOLS 72PREPROCESSOR SYMBOLS
55 73
56 Libev can be configured via a variety of preprocessor symbols you have to define 74 Libev can be configured via a variety of preprocessor symbols you have to define
57 before including any of its files. The default is not to build for mulciplicity 75 before including any of its files. The default is not to build for multiplicity
58 and only include the select backend. 76 and only include the select backend.
59 77
60 EV_STANDALONE 78 EV_STANDALONE
61 79
62 Must always be "1", which keeps libev from including config.h or 80 Must always be "1", which keeps libev from including config.h or
… …
86 If undefined or defined to be "1", libev will compile in support 104 If undefined or defined to be "1", libev will compile in support
87 for the select(2) backend. No attempt at autodetection will be 105 for the select(2) backend. No attempt at autodetection will be
88 done: if no other method takes over, select will be it. Otherwise 106 done: if no other method takes over, select will be it. Otherwise
89 the select backend will not be compiled in. 107 the select backend will not be compiled in.
90 108
109 EV_SELECT_USE_WIN32_HANDLES
110
111 When defined to 1, the select backend will assume that select
112 doesn't understand file descriptors but wants osf handles on
113 win32 (this is the case when the select to be used is the winsock
114 select). This means that it will call _get_osfhandle on the fd to
115 convert it to an OS handle. Should not be defined on non-win32
116 platforms.
117
91 EV_USE_POLL 118 EV_USE_POLL
92 119
93 If defined to be "1", libev will compile in support for the poll(2) 120 If defined to be "1", libev will compile in support for the poll(2)
94 backend. No attempt at autodetection will be done. poll usually 121 backend. No attempt at autodetection will be done. poll usually
95 performs worse than select, so its not enabled by default (it is 122 performs worse than select, so its not enabled by default (it is
… …
109 otherwise another method will be used as fallback. This is the 136 otherwise another method will be used as fallback. This is the
110 preferred backend for BSD and BSd-like systems. Darwin brokenness 137 preferred backend for BSD and BSd-like systems. Darwin brokenness
111 will be detected at runtime and routed around by disabling this 138 will be detected at runtime and routed around by disabling this
112 backend. 139 backend.
113 140
141 EV_H
142
143 The name of the ev.h header file used to include it. The default
144 if undefined is <ev.h> in event.h and "ev.h" in ev.c. This can
145 be used to virtually rename the ev.h header file in case of
146 conflicts.
147
148 EV_EVENT_H
149
150 Similarly to EV_H, this macro cna be used to override event.c's idea
151 of how the event.h header can be found.
152
153 EV_PROTOTYPES
154
155 If defined to be "0", then "ev.h" will not define any function
156 prototypes, but still define all the structs and other
157 symbols. This is occasionally useful.
158
159 EV_MULTIPLICITY
160
161 If undefined or defined to "1", then all event-loop-specific
162 functions will have the "struct ev_loop *" as first argument, and
163 you can create additional independent event loops. Otherwise there
164 will be no support for multiple event loops and there is no first
165 event loop pointer argument. Instead, all functions act on the
166 single default loop.
167
168 EV_PERIODICS
169
170 If undefined or defined to be "1", then periodic timers are
171 supported, otherwise not. This saves a few kb of code.
172
114 EV_COMMON 173 EV_COMMON
115 174
116 By default, all watchers have a "void *data" member. By redefining 175 By default, all watchers have a "void *data" member. By redefining
117 this macro to a something else you can include more and other types 176 this macro to a something else you can include more and other types
118 of members. You have to define it each time you include one of the 177 of members. You have to define it each time you include one of the
… …
120 179
121 For example, the perl EV module uses this: 180 For example, the perl EV module uses this:
122 181
123 #define EV_COMMON \ 182 #define EV_COMMON \
124 SV *self; /* contains this struct */ \ 183 SV *self; /* contains this struct */ \
125 SV *cb_sv, *fh; 184 SV *cb_sv, *fh /* note no trailing ";" */
126 185
127 EV_PROTOTYPES 186 EV_CB_DECLARE(type)
187 EV_CB_INVOKE(watcher,revents)
188 ev_set_cb(ev,cb)
128 189
129 If defined to be "0", then "ev.h" will not define any function 190 Can be used to change the callback member declaration in each
130 prototypes, but still define all the structs and other 191 watcher, and the way callbacks are invoked and set. Must expand
131 symbols. This is occasionally useful. 192 to a struct member definition and a statement, respectively. See
132 193 the ev.v header file for their default definitions. One possible
133 EV_MULTIPLICITY 194 use for overriding these is to avoid the ev_loop pointer as first
134 195 argument in all cases, or to use method calls instead of plain
135 If undefined or defined to "1", then all event-loop-specific 196 function calls in C++.
136 functions will have the "struct ev_loop *" as first argument, and
137 you can create additional independent event loops. Otherwise there
138 will be no support for multiple event loops and there is no first
139 event loop pointer argument. Instead, all functions act on the
140 single default loop.
141 197
142EXAMPLES 198EXAMPLES
143 199
144 For a real-world example of a program the includes libev 200 For a real-world example of a program the includes libev
145 verbatim, you can have a look at the EV perl module 201 verbatim, you can have a look at the EV perl module
146 (http://software.schmorp.de/pkg/EV.html). It has the libev files in 202 (http://software.schmorp.de/pkg/EV.html). It has the libev files in
147 the liev/ subdirectory and includes them in the EV/EVAPI.h (public 203 the libev/ subdirectory and includes them in the EV/EVAPI.h (public
148 interface) and EV.xs (implementation) files. Only EV.xs file will be 204 interface) and EV.xs (implementation) files. Only the EV.xs file will
149 compiled. 205 be compiled.
150 206

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