1 | EMBEDDING THE LIBEV CODE INTO YOUR OWN PROGRAMS |
1 | EMBEDDING 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 | |
9 | FILESETS |
9 | FILESETS |
10 | |
10 | |
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11 | CORE EVENT LOOP |
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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 |
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21 | (best done by writing a wrapper around ev.h that you can include |
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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" |
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26 | |
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27 | Both header files and implementation files can be compiled with a C++ |
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28 | compiler (at least, thats a stated goal, and breakage will be treated |
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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 |
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38 | ev_win32.c |
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39 | |
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40 | ev_select.c only when select backend is enabled (which is is by default) |
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41 | ev_poll.c only when poll backend is enabled (disabled by default) |
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42 | ev_epoll.c only when the epoll backend is enabled (disabled by default) |
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43 | ev_kqueue.c only when the kqueue backend is enabled (disabled by default) |
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44 | |
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45 | "ev.c" includes the backend files directly when enabled. |
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46 | |
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47 | LIBEVENT COMPATIBILITY API |
30 | |
48 | |
31 | To include the libevent compatibility API, also include: |
49 | To include the libevent compatibility API, also include: |
32 | |
50 | |
33 | #include "event.c" |
51 | #include "event.c" |
34 | |
52 | |
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41 | You need the following additional files for this: |
59 | You need the following additional files for this: |
42 | |
60 | |
43 | event.h |
61 | event.h |
44 | event.c |
62 | event.c |
45 | |
63 | |
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64 | AUTOCONF SUPPORT |
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65 | |
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66 | Instead of using EV_STANDALONE=1 and providing your config in whatever |
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67 | way you want, you can also m4_include([libev.m4]) in your configure.ac |
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68 | and leave EV_STANDALONE off. ev.c will then include "config.h" and |
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69 | configure itself accordingly. |
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70 | |
46 | PREPROCESSOR SYMBOLS |
71 | PREPROCESSOR SYMBOLS |
47 | |
72 | |
48 | Libev can be configured via a variety of preprocessor symbols you have to define |
73 | 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 |
74 | before including any of its files. The default is not to build for multiplicity |
50 | and only include the select backend. |
75 | and only include the select backend. |
51 | |
76 | |
52 | EV_STANDALONE |
77 | EV_STANDALONE |
53 | |
78 | |
54 | Must always be "1", which keeps libev from including config.h or |
79 | Must always be "1", which keeps libev from including config.h or |
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78 | If undefined or defined to be "1", libev will compile in support |
103 | If undefined or defined to be "1", libev will compile in support |
79 | for the select(2) backend. No attempt at autodetection will be |
104 | for the select(2) backend. No attempt at autodetection will be |
80 | done: if no other method takes over, select will be it. Otherwise |
105 | done: if no other method takes over, select will be it. Otherwise |
81 | the select backend will not be compiled in. |
106 | the select backend will not be compiled in. |
82 | |
107 | |
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108 | EV_SELECT_USE_WIN32_HANDLES |
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109 | |
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110 | When defined to 1, the select backend will assume that select |
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111 | doesn't understand file descriptors but wants osf handles on |
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112 | win32 (this is the case when the select to be used is the winsock |
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113 | select). This means that it will call _get_osfhandle on the fd to |
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114 | convert it to an OS handle. Should not be defined on non-win32 |
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115 | platforms. |
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116 | |
83 | EV_USE_POLL |
117 | EV_USE_POLL |
84 | |
118 | |
85 | If defined to be "1", libev will compile in support for the poll(2) |
119 | 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 |
120 | backend. No attempt at autodetection will be done. poll usually |
87 | performs worse than select, so its not enabled by default (it is |
121 | performs worse than select, so its not enabled by default (it is |
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101 | otherwise another method will be used as fallback. This is the |
135 | otherwise another method will be used as fallback. This is the |
102 | preferred backend for BSD and BSd-like systems. Darwin brokenness |
136 | preferred backend for BSD and BSd-like systems. Darwin brokenness |
103 | will be detected at runtime and routed around by disabling this |
137 | will be detected at runtime and routed around by disabling this |
104 | backend. |
138 | backend. |
105 | |
139 | |
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140 | EV_H |
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141 | |
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142 | The name of the ev.h header file used to include it. The default |
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143 | if undefined is <ev.h> in event.h and "ev.h" in ev.c. This can |
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144 | be used to virtually rename the ev.h header file in case of |
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145 | conflicts. |
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146 | |
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147 | EV_EVENT_H |
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148 | |
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149 | Similarly to EV_H, this macro cna be used to override event.c's idea |
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150 | of how the event.h header can be found. |
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151 | |
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152 | EV_PROTOTYPES |
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153 | |
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154 | If defined to be "0", then "ev.h" will not define any function |
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155 | prototypes, but still define all the structs and other |
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156 | symbols. This is occasionally useful. |
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157 | |
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158 | EV_MULTIPLICITY |
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159 | |
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160 | If undefined or defined to "1", then all event-loop-specific |
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161 | functions will have the "struct ev_loop *" as first argument, and |
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162 | you can create additional independent event loops. Otherwise there |
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163 | will be no support for multiple event loops and there is no first |
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164 | event loop pointer argument. Instead, all functions act on the |
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165 | single default loop. |
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166 | |
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167 | EV_PERIODICS |
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168 | |
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169 | If undefined or defined to be "1", then periodic timers are |
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170 | supported, otherwise not. This saves a few kb of code. |
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171 | |
106 | EV_COMMON |
172 | EV_COMMON |
107 | |
173 | |
108 | By default, all watchers have a "void *data" member. By redefining |
174 | 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 |
175 | 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 |
176 | of members. You have to define it each time you include one of the |
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112 | |
178 | |
113 | For example, the perl EV module uses this: |
179 | For example, the perl EV module uses this: |
114 | |
180 | |
115 | #define EV_COMMON \ |
181 | #define EV_COMMON \ |
116 | SV *self; /* contains this struct */ \ |
182 | SV *self; /* contains this struct */ \ |
117 | SV *cb_sv, *fh; |
183 | SV *cb_sv, *fh /* note no trailing ";" */ |
118 | |
184 | |
119 | EV_PROTOTYPES |
185 | EV_CB_DECLARE(type) |
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186 | EV_CB_INVOKE(watcher,revents) |
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187 | ev_set_cb(ev,cb) |
120 | |
188 | |
121 | If defined to be "0", then "ev.h" will not define any function |
189 | Can be used to change the callback member declaration in each |
122 | prototypes, but still define all the structs and other |
190 | watcher, and the way callbacks are invoked and set. Must expand |
123 | symbols. This is occasionally useful. |
191 | to a struct member definition and a statement, respectively. See |
124 | |
192 | the ev.v header file for their default definitions. One possible |
125 | EV_MULTIPLICITY |
193 | use for overriding these is to avoid the ev_loop pointer as first |
126 | |
194 | argument in all cases, or to use method calls instead of plain |
127 | If undefined or defined to "1", then all event-loop-specific |
195 | function calls in C++. |
128 | functions will have the "struct ev_loop *" as first argument, and |
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129 | you can create additional independent event loops. Otherwise there |
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130 | will be no support for multiple event loops and there is no first |
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131 | event loop pointer argument. Instead, all functions act on the |
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132 | single default loop. |
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133 | |
196 | |
134 | EXAMPLES |
197 | EXAMPLES |
135 | |
198 | |
136 | For a real-world example of a program the includes libev |
199 | For a real-world example of a program the includes libev |
137 | verbatim, you can have a look at the EV perl module |
200 | verbatim, you can have a look at the EV perl module |
138 | (http://software.schmorp.de/pkg/EV.html). It has the libev files in |
201 | (http://software.schmorp.de/pkg/EV.html). It has the libev files in |
139 | the liev/ subdirectory and includes them in the EV/EVAPI.h (public |
202 | the libev/ subdirectory and includes them in the EV/EVAPI.h (public |
140 | interface) and EV.xs (implementation) files. Only EV.xs file will be |
203 | interface) and EV.xs (implementation) files. Only the EV.xs file will |
141 | compiled. |
204 | be compiled. |
142 | |
205 | |