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Revision 1.26 by root, Fri Nov 16 10:37:28 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)
45 ev_port.c only when the solaris port backend is enabled (disabled by default)
36 46
37 "ev.c" includes the backend files directly when enabled. 47 "ev.c" includes the backend files directly when enabled.
48
49 LIBEVENT COMPATIBILITY API
38 50
39 To include the libevent compatibility API, also include: 51 To include the libevent compatibility API, also include:
40 52
41 #include "event.c" 53 #include "event.c"
42 54
… …
49 You need the following additional files for this: 61 You need the following additional files for this:
50 62
51 event.h 63 event.h
52 event.c 64 event.c
53 65
66AUTOCONF SUPPORT
67
68 Instead of using EV_STANDALONE=1 and providing your config in whatever
69 way you want, you can also m4_include([libev.m4]) in your configure.ac
70 and leave EV_STANDALONE off. ev.c will then include "config.h" and
71 configure itself accordingly.
72
54PREPROCESSOR SYMBOLS 73PREPROCESSOR SYMBOLS
55 74
56 Libev can be configured via a variety of preprocessor symbols you have to define 75 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 76 before including any of its files. The default is not to build for multiplicity
58 and only include the select backend. 77 and only include the select backend.
59 78
60 EV_STANDALONE 79 EV_STANDALONE
61 80
62 Must always be "1", which keeps libev from including config.h or 81 Must always be "1", which keeps libev from including config.h or
… …
65 will also not define any of the structs usually found in "event.h" 84 will also not define any of the structs usually found in "event.h"
66 that are not directly supported by libev code alone. 85 that are not directly supported by libev code alone.
67 86
68 EV_USE_MONOTONIC 87 EV_USE_MONOTONIC
69 88
70 If undefined or defined to be "1", libev will try to detect the 89 If defined to be "1", libev will try to detect the availability
71 availability of the monotonic clock option at both compiletime and 90 of the monotonic clock option at both compiletime and
72 runtime. Otherwise no use of the monotonic clock option will be 91 runtime. Otherwise no use of the monotonic clock option will be
73 attempted. 92 attempted. If you enable this, you usually have to link against
93 librt or something similar. Enabling it when the functionality
94 isn't available is safe, though.
74 95
75 EV_USE_REALTIME 96 EV_USE_REALTIME
76 97
77 If defined to be "1", libev will try to detect the availability 98 If defined to be "1", libev will try to detect the availability
78 of the realtime clock option at compiletime (and assume its 99 of the realtime clock option at compiletime (and assume its
… …
86 If undefined or defined to be "1", libev will compile in support 107 If undefined or defined to be "1", libev will compile in support
87 for the select(2) backend. No attempt at autodetection will be 108 for the select(2) backend. No attempt at autodetection will be
88 done: if no other method takes over, select will be it. Otherwise 109 done: if no other method takes over, select will be it. Otherwise
89 the select backend will not be compiled in. 110 the select backend will not be compiled in.
90 111
112 EV_SELECT_USE_FD_SET
113
114 If defined to 1, then the select backend will use the system fd_set
115 structure. This is useful if libev doesn't compile due to a missing
116 NFDBITS or fd_mask definition or it misguesses the bitset layout on
117 exotic systems. This usually limits the range of file descriptors
118 to some low limit such as 1024 or might have other limitations
119 (winsocket only allows 64 sockets). The FD_SETSIZE macro, set
120 before compilation, might influence the size of the fd_set used.
121
122 EV_SELECT_IS_WINSOCKET
123
124 When defined to 1, the select backend will assume that select
125 doesn't understand file descriptors but wants osf handles on
126 win32 (this is the case when the select to be used is the winsock
127 select). This means that it will call _get_osfhandle on the fd to
128 convert it to an OS handle. Should not be defined on non-win32
129 platforms.
130
91 EV_USE_POLL 131 EV_USE_POLL
92 132
93 If defined to be "1", libev will compile in support for the poll(2) 133 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 134 backend. Otherwise it will be enabled on non-win32 platforms. It
95 performs worse than select, so its not enabled by default (it is 135 takes precedence over select.
96 also slightly less portable).
97 136
98 EV_USE_EPOLL 137 EV_USE_EPOLL
99 138
100 If defined to be "1", libev will compile in support for the Linux 139 If defined to be "1", libev will compile in support for the Linux
101 epoll backend. Its availability will be detected at runtime, 140 epoll backend. Its availability will be detected at runtime,
… …
105 EV_USE_KQUEUE 144 EV_USE_KQUEUE
106 145
107 If defined to be "1", libev will compile in support for the BSD 146 If defined to be "1", libev will compile in support for the BSD
108 style kqueue backend. Its availability will be detected at runtime, 147 style kqueue backend. Its availability will be detected at runtime,
109 otherwise another method will be used as fallback. This is the 148 otherwise another method will be used as fallback. This is the
110 preferred backend for BSD and BSd-like systems. Darwin brokenness 149 preferred backend for BSD and BSD-like systems. Darwin brokenness
111 will be detected at runtime and routed around by disabling this 150 will be detected at runtime and routed around by disabling this
112 backend. 151 backend.
152
153 EV_USE_PORT
154
155 If defined to be "1", libev will compile in support for the Solaris
156 10 port style backend. Its availability will be detected at runtime,
157 otherwise another method will be used as fallback. This is the
158 preferred backend for Solaris 10 systems.
159
160 EV_USE_DEVPOLL
161
162 reserved for future expansion, works like the USE symbols above.
163
164 EV_H
165
166 The name of the ev.h header file used to include it. The default
167 if undefined is <ev.h> in event.h and "ev.h" in ev.c. This can
168 be used to virtually rename the ev.h header file in case of
169 conflicts.
170
171 EV_EVENT_H
172
173 Similarly to EV_H, this macro cna be used to override event.c's idea
174 of how the event.h header can be found.
175
176 EV_PROTOTYPES
177
178 If defined to be "0", then "ev.h" will not define any function
179 prototypes, but still define all the structs and other
180 symbols. This is occasionally useful.
181
182 EV_MULTIPLICITY
183
184 If undefined or defined to "1", then all event-loop-specific
185 functions will have the "struct ev_loop *" as first argument, and
186 you can create additional independent event loops. Otherwise there
187 will be no support for multiple event loops and there is no first
188 event loop pointer argument. Instead, all functions act on the
189 single default loop.
190
191 EV_PERIODICS
192
193 If undefined or defined to be "1", then periodic timers are
194 supported, otherwise not. This saves a few kb of code.
113 195
114 EV_COMMON 196 EV_COMMON
115 197
116 By default, all watchers have a "void *data" member. By redefining 198 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 199 this macro to a something else you can include more and other types
… …
120 202
121 For example, the perl EV module uses this: 203 For example, the perl EV module uses this:
122 204
123 #define EV_COMMON \ 205 #define EV_COMMON \
124 SV *self; /* contains this struct */ \ 206 SV *self; /* contains this struct */ \
125 SV *cb_sv, *fh; 207 SV *cb_sv, *fh /* note no trailing ";" */
126 208
127 EV_PROTOTYPES 209 EV_CB_DECLARE(type)
210 EV_CB_INVOKE(watcher,revents)
211 ev_set_cb(ev,cb)
128 212
129 If defined to be "0", then "ev.h" will not define any function 213 Can be used to change the callback member declaration in each
130 prototypes, but still define all the structs and other 214 watcher, and the way callbacks are invoked and set. Must expand
131 symbols. This is occasionally useful. 215 to a struct member definition and a statement, respectively. See
132 216 the ev.v header file for their default definitions. One possible
133 EV_MULTIPLICITY 217 use for overriding these is to avoid the ev_loop pointer as first
134 218 argument in all cases, or to use method calls instead of plain
135 If undefined or defined to "1", then all event-loop-specific 219 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.
141 220
142EXAMPLES 221EXAMPLES
143 222
144 For a real-world example of a program the includes libev 223 For a real-world example of a program the includes libev
145 verbatim, you can have a look at the EV perl module 224 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 225 (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 226 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 227 interface) and EV.xs (implementation) files. Only the EV.xs file will
149 compiled. 228 be compiled.
150 229

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