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 |
30 | |
38 | |
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39 | ev_win32.c required on win32 platforms only |
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40 | |
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41 | ev_select.c only when select backend is enabled (which is is by default) |
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42 | ev_poll.c only when poll backend is enabled (disabled by default) |
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43 | ev_epoll.c only when the epoll backend is enabled (disabled by default) |
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44 | ev_kqueue.c only when the kqueue backend is enabled (disabled by default) |
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45 | |
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46 | "ev.c" includes the backend files directly when enabled. |
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47 | |
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48 | LIBEVENT COMPATIBILITY API |
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49 | |
31 | To include the libevent compatibility API, also include: |
50 | To include the libevent compatibility API, also include: |
32 | |
51 | |
33 | #include "event.c" |
52 | #include "event.c" |
34 | |
53 | |
35 | in the file including "ev.c", and: |
54 | in the file including "ev.c", and: |
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41 | You need the following additional files for this: |
60 | You need the following additional files for this: |
42 | |
61 | |
43 | event.h |
62 | event.h |
44 | event.c |
63 | event.c |
45 | |
64 | |
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65 | AUTOCONF SUPPORT |
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66 | |
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67 | Instead of using EV_STANDALONE=1 and providing your config in whatever |
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68 | way you want, you can also m4_include([libev.m4]) in your configure.ac |
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69 | and leave EV_STANDALONE off. ev.c will then include "config.h" and |
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70 | configure itself accordingly. |
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71 | |
46 | PREPROCESSOR SYMBOLS |
72 | PREPROCESSOR SYMBOLS |
47 | |
73 | |
48 | 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 |
49 | 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 |
50 | and only include the select backend. |
76 | and only include the select backend. |
51 | |
77 | |
52 | EV_STANDALONE |
78 | EV_STANDALONE |
53 | |
79 | |
54 | 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 |
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78 | 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 |
79 | for the select(2) backend. No attempt at autodetection will be |
105 | for the select(2) backend. No attempt at autodetection will be |
80 | 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 |
81 | the select backend will not be compiled in. |
107 | the select backend will not be compiled in. |
82 | |
108 | |
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109 | EV_SELECT_USE_FD_SET |
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110 | |
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111 | If defined to 1, then the select backend will use the system fd_set |
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112 | structure. This is useful if libev doesn't compile due to a missing |
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113 | NFDBITS or fd_mask definition or it misguesses the bitset layout on |
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114 | exotic systems. This usually limits the range of file descriptors |
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115 | to some low limit such as 1024 or might have other limitations |
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116 | (winsocket only allows 64 sockets). The FD_SETSIZE macro, set |
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117 | before compilation, might influence the size of the fd_set used. |
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118 | |
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119 | EV_SELECT_IS_WINSOCKET |
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120 | |
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121 | When defined to 1, the select backend will assume that select |
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122 | doesn't understand file descriptors but wants osf handles on |
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123 | win32 (this is the case when the select to be used is the winsock |
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124 | select). This means that it will call _get_osfhandle on the fd to |
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125 | convert it to an OS handle. Should not be defined on non-win32 |
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126 | platforms. |
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127 | |
83 | EV_USE_POLL |
128 | EV_USE_POLL |
84 | |
129 | |
85 | If defined to be "1", libev will compile in support for the poll(2) |
130 | 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 |
131 | backend. Otherwise it will be enabled on non-win32 platforms. It |
87 | performs worse than select, so its not enabled by default (it is |
132 | takes precedence over select. |
88 | also slightly less portable). |
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89 | |
133 | |
90 | EV_USE_EPOLL |
134 | EV_USE_EPOLL |
91 | |
135 | |
92 | If defined to be "1", libev will compile in support for the Linux |
136 | If defined to be "1", libev will compile in support for the Linux |
93 | epoll backend. Its availability will be detected at runtime, |
137 | epoll backend. Its availability will be detected at runtime, |
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97 | EV_USE_KQUEUE |
141 | EV_USE_KQUEUE |
98 | |
142 | |
99 | If defined to be "1", libev will compile in support for the BSD |
143 | If defined to be "1", libev will compile in support for the BSD |
100 | style kqueue backend. Its availability will be detected at runtime, |
144 | style kqueue backend. Its availability will be detected at runtime, |
101 | otherwise another method will be used as fallback. This is the |
145 | otherwise another method will be used as fallback. This is the |
102 | preferred backend for BSD and BSd-like systems. Darwin brokenness |
146 | preferred backend for BSD and BSD-like systems. Darwin brokenness |
103 | will be detected at runtime and routed around by disabling this |
147 | will be detected at runtime and routed around by disabling this |
104 | backend. |
148 | backend. |
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149 | |
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150 | EV_USE_PORT |
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151 | |
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152 | If defined to be "1", libev will compile in support for the Solaris |
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153 | 10 port style backend. Its availability will be detected at runtime, |
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154 | otherwise another method will be used as fallback. This is the |
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155 | preferred backend for Solaris 10 systems. |
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156 | |
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157 | EV_USE_DEVPOLL |
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158 | |
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159 | reserved for future expansion, works like the USE symbols above. |
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160 | |
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161 | EV_H |
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162 | |
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163 | The name of the ev.h header file used to include it. The default |
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164 | if undefined is <ev.h> in event.h and "ev.h" in ev.c. This can |
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165 | be used to virtually rename the ev.h header file in case of |
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166 | conflicts. |
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167 | |
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168 | EV_EVENT_H |
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169 | |
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170 | Similarly to EV_H, this macro cna be used to override event.c's idea |
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171 | of how the event.h header can be found. |
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172 | |
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173 | EV_PROTOTYPES |
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174 | |
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175 | If defined to be "0", then "ev.h" will not define any function |
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176 | prototypes, but still define all the structs and other |
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177 | symbols. This is occasionally useful. |
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178 | |
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179 | EV_MULTIPLICITY |
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180 | |
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181 | If undefined or defined to "1", then all event-loop-specific |
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182 | functions will have the "struct ev_loop *" as first argument, and |
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183 | you can create additional independent event loops. Otherwise there |
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184 | will be no support for multiple event loops and there is no first |
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185 | event loop pointer argument. Instead, all functions act on the |
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186 | single default loop. |
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187 | |
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188 | EV_PERIODICS |
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189 | |
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190 | If undefined or defined to be "1", then periodic timers are |
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191 | supported, otherwise not. This saves a few kb of code. |
105 | |
192 | |
106 | EV_COMMON |
193 | EV_COMMON |
107 | |
194 | |
108 | By default, all watchers have a "void *data" member. By redefining |
195 | 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 |
196 | this macro to a something else you can include more and other types |
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112 | |
199 | |
113 | For example, the perl EV module uses this: |
200 | For example, the perl EV module uses this: |
114 | |
201 | |
115 | #define EV_COMMON \ |
202 | #define EV_COMMON \ |
116 | SV *self; /* contains this struct */ \ |
203 | SV *self; /* contains this struct */ \ |
117 | SV *cb_sv, *fh; |
204 | SV *cb_sv, *fh /* note no trailing ";" */ |
118 | |
205 | |
119 | EV_PROTOTYPES |
206 | EV_CB_DECLARE(type) |
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207 | EV_CB_INVOKE(watcher,revents) |
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208 | ev_set_cb(ev,cb) |
120 | |
209 | |
121 | If defined to be "0", then "ev.h" will not define any function |
210 | Can be used to change the callback member declaration in each |
122 | prototypes, but still define all the structs and other |
211 | watcher, and the way callbacks are invoked and set. Must expand |
123 | symbols. This is occasionally useful. |
212 | to a struct member definition and a statement, respectively. See |
124 | |
213 | the ev.v header file for their default definitions. One possible |
125 | EV_MULTIPLICITY |
214 | use for overriding these is to avoid the ev_loop pointer as first |
126 | |
215 | argument in all cases, or to use method calls instead of plain |
127 | If undefined or defined to "1", then all event-loop-specific |
216 | 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 | |
217 | |
134 | EXAMPLES |
218 | EXAMPLES |
135 | |
219 | |
136 | For a real-world example of a program the includes libev verbatim, you |
220 | For a real-world example of a program the includes libev |
137 | can have a look at the EV perl module (http://software.schmorp.de/pkg/EV.html). |
221 | verbatim, you can have a look at the EV perl module |
138 | It has the libev files in the liev/ subdirectory and includes them in the |
222 | (http://software.schmorp.de/pkg/EV.html). It has the libev files in |
139 | EV.xs files. Only this file will be compiled. |
223 | the libev/ subdirectory and includes them in the EV/EVAPI.h (public |
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224 | interface) and EV.xs (implementation) files. Only the EV.xs file will |
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225 | be compiled. |
140 | |
226 | |