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 |
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10 | |
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11 | CORE EVENT LOOP |
10 | |
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 | |
30 | ev_select.c only when select backend is enabled (which is by default) |
40 | ev_select.c only when select backend is enabled (which is is by default) |
31 | ev_poll.c only when poll backend is enabled (disabled by default) |
41 | ev_poll.c only when poll backend is enabled (disabled by default) |
32 | ev_epoll.c only when the epoll backend is enabled (disabled by default) |
42 | ev_epoll.c only when the epoll backend is enabled (disabled by default) |
33 | ev_kqueue.c only when the kqueue backend is enabled (disabled by default) |
43 | ev_kqueue.c only when the kqueue backend is enabled (disabled by default) |
34 | |
44 | |
35 | "ev.c" includes the backend files directly when enabled. |
45 | "ev.c" includes the backend files directly when enabled. |
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46 | |
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47 | LIBEVENT COMPATIBILITY API |
36 | |
48 | |
37 | To include the libevent compatibility API, also include: |
49 | To include the libevent compatibility API, also include: |
38 | |
50 | |
39 | #include "event.c" |
51 | #include "event.c" |
40 | |
52 | |
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61 | other files, and it also defines dummy implementations for some |
73 | other files, and it also defines dummy implementations for some |
62 | libevent functions (such as logging, which is not supported). It |
74 | libevent functions (such as logging, which is not supported). It |
63 | will also not define any of the structs usually found in "event.h" |
75 | will also not define any of the structs usually found in "event.h" |
64 | that are not directly supported by libev code alone. |
76 | that are not directly supported by libev code alone. |
65 | |
77 | |
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78 | EV_H |
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79 | |
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80 | The name of the ev.h header file used to include it. The default |
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81 | if undefined is <ev.h> in event.h and "ev.h" in ev.c. This can be used |
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82 | to virtually rename the ev.h header file |
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83 | |
66 | EV_USE_MONOTONIC |
84 | EV_USE_MONOTONIC |
67 | |
85 | |
68 | If undefined or defined to be "1", libev will try to detect the |
86 | If undefined or defined to be "1", libev will try to detect the |
69 | availability of the monotonic clock option at both compiletime and |
87 | availability of the monotonic clock option at both compiletime and |
70 | runtime. Otherwise no use of the monotonic clock option will be |
88 | runtime. Otherwise no use of the monotonic clock option will be |
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83 | |
101 | |
84 | If undefined or defined to be "1", libev will compile in support |
102 | If undefined or defined to be "1", libev will compile in support |
85 | for the select(2) backend. No attempt at autodetection will be |
103 | for the select(2) backend. No attempt at autodetection will be |
86 | done: if no other method takes over, select will be it. Otherwise |
104 | done: if no other method takes over, select will be it. Otherwise |
87 | the select backend will not be compiled in. |
105 | the select backend will not be compiled in. |
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106 | |
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107 | EV_SELECT_USE_WIN32_HANDLES |
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108 | |
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109 | When defined to 1, the select backend will assume that select |
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110 | doesn't understand file descriptors but wants osf handles on |
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111 | win32 (this is the case when the select to be used is the winsock |
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112 | select). This means that it will call _get_osfhandle on the fd to |
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113 | convert it to an OS handle. Should not be defined on non-win32 |
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114 | platforms. |
88 | |
115 | |
89 | EV_USE_POLL |
116 | EV_USE_POLL |
90 | |
117 | |
91 | If defined to be "1", libev will compile in support for the poll(2) |
118 | If defined to be "1", libev will compile in support for the poll(2) |
92 | backend. No attempt at autodetection will be done. poll usually |
119 | backend. No attempt at autodetection will be done. poll usually |
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118 | |
145 | |
119 | For example, the perl EV module uses this: |
146 | For example, the perl EV module uses this: |
120 | |
147 | |
121 | #define EV_COMMON \ |
148 | #define EV_COMMON \ |
122 | SV *self; /* contains this struct */ \ |
149 | SV *self; /* contains this struct */ \ |
123 | SV *cb_sv, *fh; |
150 | SV *cb_sv, *fh /* note no trailing ";" */ |
124 | |
151 | |
125 | EV_PROTOTYPES |
152 | EV_PROTOTYPES |
126 | |
153 | |
127 | If defined to be "0", then "ev.h" will not define any function |
154 | If defined to be "0", then "ev.h" will not define any function |
128 | prototypes, but still define all the structs and other |
155 | prototypes, but still define all the structs and other |
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140 | EXAMPLES |
167 | EXAMPLES |
141 | |
168 | |
142 | For a real-world example of a program the includes libev |
169 | For a real-world example of a program the includes libev |
143 | verbatim, you can have a look at the EV perl module |
170 | verbatim, you can have a look at the EV perl module |
144 | (http://software.schmorp.de/pkg/EV.html). It has the libev files in |
171 | (http://software.schmorp.de/pkg/EV.html). It has the libev files in |
145 | the liev/ subdirectory and includes them in the EV/EVAPI.h (public |
172 | the libev/ subdirectory and includes them in the EV/EVAPI.h (public |
146 | interface) and EV.xs (implementation) files. Only EV.xs file will be |
173 | interface) and EV.xs (implementation) files. Only the EV.xs file will |
147 | compiled. |
174 | be compiled. |
148 | |
175 | |