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1 | /* |
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2 | * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions are |
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7 | * met: |
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8 | * |
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9 | * * Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * |
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12 | * * Redistributions in binary form must reproduce the above |
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13 | * copyright notice, this list of conditions and the following |
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14 | * disclaimer in the documentation and/or other materials provided |
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15 | * with the distribution. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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18 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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19 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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20 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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21 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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22 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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23 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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27 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | */ |
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29 | |
1 | #ifndef EV_H |
30 | #ifndef EV_H |
2 | #define EV_H |
31 | #define EV_H |
3 | |
32 | |
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33 | #ifdef __cplusplus |
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34 | extern "C" { |
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35 | #endif |
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36 | |
4 | typedef double ev_tstamp; |
37 | typedef double ev_tstamp; |
5 | |
38 | |
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39 | /* these priorities are inclusive, higher priorities will be called earlier */ |
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40 | #ifndef EV_MINPRI |
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41 | # define EV_MINPRI -2 |
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42 | #endif |
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43 | #ifndef EV_MAXPRI |
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44 | # define EV_MAXPRI +2 |
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45 | #endif |
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46 | |
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47 | #ifndef EV_MULTIPLICITY |
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48 | # define EV_MULTIPLICITY 1 |
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49 | #endif |
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50 | |
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51 | /* support multiple event loops? */ |
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52 | #if EV_MULTIPLICITY |
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53 | struct ev_loop; |
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54 | # define EV_P struct ev_loop *loop |
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55 | # define EV_P_ EV_P, |
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56 | # define EV_A loop |
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57 | # define EV_A_ EV_A, |
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58 | #else |
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59 | # define EV_P void |
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60 | # define EV_P_ |
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61 | # define EV_A |
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62 | # define EV_A_ |
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63 | #endif |
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64 | |
6 | /* eventmask, revents, events... */ |
65 | /* eventmask, revents, events... */ |
7 | #define EV_UNDEF -1 /* guaranteed to be invalid */ |
66 | #define EV_UNDEF -1 /* guaranteed to be invalid */ |
8 | #define EV_NONE 0 |
67 | #define EV_NONE 0x00 |
9 | #define EV_READ 1 |
68 | #define EV_READ 0x01 |
10 | #define EV_WRITE 2 |
69 | #define EV_WRITE 0x02 |
11 | #define EV_TIMEOUT 4 |
70 | #define EV_TIMEOUT 0x000100 |
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71 | #define EV_PERIODIC 0x000200 |
12 | #define EV_SIGNAL 8 |
72 | #define EV_SIGNAL 0x000400 |
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73 | #define EV_IDLE 0x000800 |
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74 | #define EV_CHECK 0x001000 |
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75 | #define EV_PREPARE 0x002000 |
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76 | #define EV_CHILD 0x004000 |
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77 | #define EV_ERROR 0x800000 /* sent when an error occurs */ |
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78 | |
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79 | /* can be used to add custom fields to all watchers */ |
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80 | #ifndef EV_COMMON |
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81 | # define EV_COMMON void *data |
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82 | #endif |
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83 | #ifndef EV_PROTOTYPES |
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84 | # define EV_PROTOTYPES 1 |
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85 | #endif |
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86 | |
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87 | #define EV_VERSION_MAJOR 1 |
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88 | #define EV_VERSION_MINOR 1 |
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89 | |
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90 | /* |
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91 | * struct member types: |
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92 | * private: you can look at them, but not change them, and they might not mean anything to you. |
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93 | * ro: can be read anytime, but only changed when the watcher isn't active |
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94 | * rw: can be read and modified anytime, even when the watcher is active |
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95 | */ |
13 | |
96 | |
14 | /* shared by all watchers */ |
97 | /* shared by all watchers */ |
15 | #define EV_WATCHER(type) \ |
98 | #define EV_WATCHER(type) \ |
16 | int active; /* private */ \ |
99 | int active; /* private */ \ |
17 | int pending; /* private */ \ |
100 | int pending; /* private */ \ |
18 | void *data; /* rw */ \ |
101 | int priority; /* private */ \ |
19 | void (*cb)(struct type *, int revents) /* rw */ |
102 | EV_COMMON; /* rw */ \ |
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103 | void (*cb)(EV_P_ struct type *, int revents); /* private */ /* gets invoked with an eventmask */ |
20 | |
104 | |
21 | #define EV_WATCHER_LIST(type) \ |
105 | #define EV_WATCHER_LIST(type) \ |
22 | EV_WATCHER (type); \ |
106 | EV_WATCHER (type); \ |
23 | struct type *next /* private */ |
107 | struct ev_watcher_list *next /* private */ |
24 | |
108 | |
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109 | #define EV_WATCHER_TIME(type) \ |
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110 | EV_WATCHER (type); \ |
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111 | ev_tstamp at /* private */ |
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112 | |
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113 | /* base class, nothing to see here unless you subclass */ |
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114 | struct ev_watcher { |
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115 | EV_WATCHER (ev_watcher); |
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116 | }; |
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117 | |
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118 | /* base class, nothing to see here unless you subclass */ |
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119 | struct ev_watcher_list { |
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120 | EV_WATCHER_LIST (ev_watcher_list); |
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121 | }; |
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122 | |
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123 | /* base class, nothing to see here unless you subclass */ |
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124 | struct ev_watcher_time { |
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125 | EV_WATCHER_TIME (ev_watcher_time); |
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126 | }; |
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127 | |
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128 | /* invoked after a specific time, repeatable (based on monotonic clock) */ |
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129 | /* revent EV_TIMEOUT */ |
25 | struct ev_timer |
130 | struct ev_timer |
26 | { |
131 | { |
27 | EV_WATCHER_LIST (ev_timer); |
132 | EV_WATCHER_TIME (ev_timer); |
28 | |
133 | |
29 | ev_tstamp at; /* private */ |
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30 | ev_tstamp repeat; /* rw */ |
134 | ev_tstamp repeat; /* rw */ |
31 | unsigned char is_abs; /* ro */ |
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32 | }; |
135 | }; |
33 | |
136 | |
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137 | /* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */ |
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138 | /* revent EV_PERIODIC */ |
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139 | struct ev_periodic |
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140 | { |
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141 | EV_WATCHER_TIME (ev_periodic); |
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142 | |
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143 | ev_tstamp interval; /* rw */ |
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144 | }; |
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145 | |
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146 | /* invoked when fd is either EV_READable or EV_WRITEable */ |
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147 | /* revent EV_READ, EV_WRITE */ |
34 | struct ev_io |
148 | struct ev_io |
35 | { |
149 | { |
36 | EV_WATCHER_LIST (ev_io); |
150 | EV_WATCHER_LIST (ev_io); |
37 | |
151 | |
38 | int fd; /* ro */ |
152 | int fd; /* ro */ |
39 | int events; /* ro */ |
153 | int events; /* ro */ |
40 | }; |
154 | }; |
41 | |
155 | |
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156 | /* invoked when the given signal has been received */ |
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157 | /* revent EV_SIGNAL */ |
42 | struct ev_signal |
158 | struct ev_signal |
43 | { |
159 | { |
44 | EV_WATCHER_LIST (ev_signal); |
160 | EV_WATCHER_LIST (ev_signal); |
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161 | #if EV_MULTIPLICITY |
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162 | struct ev_loop *loop; |
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163 | #endif |
45 | |
164 | |
46 | int signum; /* ro */ |
165 | int signum; /* ro */ |
47 | }; |
166 | }; |
48 | |
167 | |
49 | #define EVMETHOD_NONE 0 |
168 | /* invoked when the nothing else needs to be done, keeps the process from blocking */ |
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169 | /* revent EV_IDLE */ |
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170 | struct ev_idle |
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171 | { |
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172 | EV_WATCHER (ev_idle); |
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173 | }; |
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174 | |
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175 | /* invoked for each run of the mainloop, just before the blocking call */ |
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176 | /* you can still change events in any way you like */ |
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177 | /* revent EV_PREPARE */ |
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178 | struct ev_prepare |
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179 | { |
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180 | EV_WATCHER (ev_prepare); |
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181 | }; |
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182 | |
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183 | /* invoked for each run of the mainloop, just after the blocking call */ |
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184 | /* revent EV_CHECK */ |
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185 | struct ev_check |
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186 | { |
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187 | EV_WATCHER (ev_check); |
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188 | }; |
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189 | |
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190 | /* invoked when sigchld is received and waitpid indicates the givne pid */ |
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191 | /* revent EV_CHILD */ |
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192 | /* does not support priorities */ |
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193 | struct ev_child |
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194 | { |
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195 | EV_WATCHER_LIST (ev_child); |
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196 | |
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197 | int pid; /* ro */ |
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198 | int rpid; /* rw, holds the received pid */ |
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199 | int rstatus; /* rw, holds the exit status, use the macros from sys/wait.h */ |
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200 | }; |
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201 | |
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202 | union ev_any_watcher |
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203 | { |
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204 | struct ev_watcher w; |
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205 | struct ev_watcher_list wl; |
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206 | struct ev_io io; |
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207 | struct ev_timer timer; |
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208 | struct ev_periodic periodic; |
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209 | struct ev_signal signal; |
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210 | struct ev_idle idle; |
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211 | struct ev_child child; |
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212 | struct ev_prepare prepare; |
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213 | struct ev_check check; |
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214 | }; |
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215 | |
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216 | #define EVMETHOD_AUTO 0 /* consults environment */ |
50 | #define EVMETHOD_SELECT 1 |
217 | #define EVMETHOD_SELECT 1 |
51 | #define EVMETHOD_EPOLL 2 |
218 | #define EVMETHOD_POLL 2 |
52 | int ev_init (int flags); |
219 | #define EVMETHOD_EPOLL 4 |
53 | extern int ev_method; |
220 | #define EVMETHOD_KQUEUE 8 |
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221 | #define EVMETHOD_DEVPOLL 16 /* NYI */ |
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222 | #define EVMETHOD_PORT 32 /* NYI */ |
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223 | #define EVMETHOD_WIN32 64 /* NYI */ |
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224 | #define EVMETHOD_ANY ~0 /* any method, do not consult env */ |
54 | |
225 | |
55 | void ev_prefork (void); |
226 | #if EV_PROTOTYPES |
56 | void ev_postfork_parent (void); |
227 | int ev_version_major (void); |
57 | void ev_postfork_child (void); |
228 | int ev_version_minor (void); |
58 | |
229 | |
59 | extern ev_tstamp ev_now; /* time w.r.t. timers and the eventloop, updated after each poll */ |
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60 | ev_tstamp ev_time (void); |
230 | ev_tstamp ev_time (void); |
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231 | |
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232 | /* Sets the allocation function to use, works like realloc. |
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233 | * It is used to allocate and free memory. |
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234 | * If it returns zero when memory needs to be allocated, the library might abort |
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235 | * or take some potentially destructive action. |
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236 | * The default is your system realloc function. |
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237 | */ |
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238 | void ev_set_allocator (void *(*cb)(void *ptr, long size)); |
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239 | |
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240 | /* set the callback function to call on a |
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241 | * retryable syscall error |
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242 | * (such as failed select, poll, epoll_wait) |
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243 | */ |
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244 | void ev_set_syserr_cb (void (*cb)(const char *msg)); |
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245 | |
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246 | # if EV_MULTIPLICITY |
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247 | /* the default loop is the only one that handles signals and child watchers */ |
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248 | /* you can call this as often as you like */ |
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249 | struct ev_loop *ev_default_loop (int methods); /* returns default loop */ |
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250 | |
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251 | /* create and destroy alternative loops that don't handle signals */ |
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252 | struct ev_loop *ev_loop_new (int methods); |
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253 | void ev_loop_destroy (EV_P); |
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254 | void ev_loop_fork (EV_P); |
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255 | # else |
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256 | int ev_default_loop (int methods); /* returns true when successful */ |
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257 | # endif |
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258 | |
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259 | void ev_default_destroy (void); /* destroy the default loop */ |
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260 | /* this needs to be called after fork, to duplicate the default loop */ |
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261 | /* if you create alternative loops you have to call ev_loop_fork on them */ |
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262 | /* you can call it in either the parent or the child */ |
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263 | /* you can actually call it at any time, anywhere :) */ |
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264 | void ev_default_fork (void); |
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265 | |
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266 | int ev_method (EV_P); |
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267 | #endif |
61 | |
268 | |
62 | #define EVLOOP_NONBLOCK 1 /* do not block/wait */ |
269 | #define EVLOOP_NONBLOCK 1 /* do not block/wait */ |
63 | #define EVLOOP_ONESHOT 2 /* block *once* only */ |
270 | #define EVLOOP_ONESHOT 2 /* block *once* only */ |
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271 | #define EVUNLOOP_ONCE 1 /* unloop once */ |
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272 | #define EVUNLOOP_ALL 2 /* unloop all loops */ |
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273 | |
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274 | #if EV_PROTOTYPES |
64 | void ev_loop (int flags); |
275 | void ev_loop (EV_P_ int flags); |
65 | extern int ev_loop_done; /* set to 1 to break out of event loop */ |
276 | void ev_unloop (EV_P_ int how); /* set to 1 to break out of event loop, set to 2 to break out of all event loops */ |
66 | |
277 | |
67 | #define EVHOOK_PREPOLL 0 /* called before updating fds, timers and blocking */ |
278 | ev_tstamp ev_now (EV_P); /* time w.r.t. timers and the eventloop, updated after each poll */ |
68 | #define EVHOOK_POSTPOLL 1 /* called after blocking */ |
279 | |
69 | #define EVHOOK_NUM 2 /* just the # of hooks */ |
280 | /* |
70 | typedef void (*ev_hook)(void); |
281 | * ref/unref can be used to add or remove a refcount on the mainloop. every watcher |
71 | void ev_hook_register (int type, ev_hook hook); |
282 | * keeps one reference. if you have a long-runing watcher you never unregister that |
72 | void ev_hook_unregister (int type, ev_hook hook); |
283 | * should not keep ev_loop from running, unref() after starting, and ref() before stopping. |
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284 | */ |
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285 | void ev_ref (EV_P); |
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286 | void ev_unref (EV_P); |
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287 | |
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288 | /* convinience function, wait for a single event, without registering an event watcher */ |
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289 | /* if timeout is < 0, do wait indefinitely */ |
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290 | void ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg); |
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291 | #endif |
73 | |
292 | |
74 | /* these may evaluate ev multiple times, and the other arguments at most once */ |
293 | /* these may evaluate ev multiple times, and the other arguments at most once */ |
75 | #define evw_init(ev,cb_,data_) do { (ev)->active = 0; (ev)->cb = (cb_); (ev)->data = (void *)data_; } while (0) |
294 | /* either use ev_watcher_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */ |
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295 | #define ev_watcher_init(ev,cb_) do { \ |
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296 | ((struct ev_watcher *)(void *)(ev))->active = \ |
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297 | ((struct ev_watcher *)(void *)(ev))->pending = \ |
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298 | ((struct ev_watcher *)(void *)(ev))->priority = 0; \ |
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299 | (ev)->cb = (cb_); \ |
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300 | } while (0) |
76 | |
301 | |
77 | #define evio_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0) |
302 | #define ev_io_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0) |
78 | #define evtimer_set_rel(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); (ev)->is_abs = 0; } while (0) |
303 | #define ev_timer_set(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0) |
79 | #define evtimer_set_abs(ev,at_,repeat_) do { (ev)->at = (at_); (ev)->repeat = (repeat_); (ev)->is_abs = 1; } while (0) |
304 | #define ev_periodic_set(ev,at_,interval_) do { (ev)->at = (at_); (ev)->interval = (interval_); } while (0) |
80 | #define evsignal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0) |
305 | #define ev_signal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0) |
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306 | #define ev_idle_set(ev) /* nop, yes, this is a serious in-joke */ |
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307 | #define ev_prepare_set(ev) /* nop, yes, this is a serious in-joke */ |
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308 | #define ev_check_set(ev) /* nop, yes, this is a serious in-joke */ |
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309 | #define ev_child_set(ev,pid_) do { (ev)->pid = (pid_); } while (0) |
81 | |
310 | |
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311 | #define ev_io_init(ev,cb,fd,events) do { ev_watcher_init ((ev), (cb)); ev_io_set ((ev),(fd),(events)); } while (0) |
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312 | #define ev_timer_init(ev,cb,after,repeat) do { ev_watcher_init ((ev), (cb)); ev_timer_set ((ev),(after),(repeat)); } while (0) |
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313 | #define ev_periodic_init(ev,cb,at,interval) do { ev_watcher_init ((ev), (cb)); ev_periodic_set ((ev),(at),(interval)); } while (0) |
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314 | #define ev_signal_init(ev,cb,signum) do { ev_watcher_init ((ev), (cb)); ev_signal_set ((ev), (signum)); } while (0) |
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315 | #define ev_idle_init(ev,cb) do { ev_watcher_init ((ev), (cb)); ev_idle_set ((ev)); } while (0) |
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316 | #define ev_prepare_init(ev,cb) do { ev_watcher_init ((ev), (cb)); ev_prepare_set ((ev)); } while (0) |
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317 | #define ev_check_init(ev,cb) do { ev_watcher_init ((ev), (cb)); ev_check_set ((ev)); } while (0) |
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318 | #define ev_child_init(ev,cb,pid) do { ev_watcher_init ((ev), (cb)); ev_child_set ((ev),(pid)); } while (0) |
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319 | |
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320 | #define ev_is_pending(ev) (0 + ((struct ev_watcher *)(void *)(ev))->pending) /* ro, true when watcher is waiting for callback invocation */ |
82 | #define ev_is_active(ev) (0 + (ev)->active) /* true when the watcher has been started */ |
321 | #define ev_is_active(ev) (0 + ((struct ev_watcher *)(void *)(ev))->active) /* ro, true when the watcher has been started */ |
83 | |
322 | |
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323 | #define ev_priority(ev) ((struct ev_watcher *)(void *)(ev))->priority /* rw */ |
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324 | #define ev_cb(ev) (ev)->cb /* rw */ |
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325 | #define ev_set_priority(ev,pri) ev_priority (ev) = (pri) |
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326 | #define ev_set_cb(ev,cb_) ev_cb (ev) = (cb_) |
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327 | |
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328 | /* stopping (enabling, adding) a watcher does nothing if it is already running */ |
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329 | /* stopping (disabling, deleting) a watcher does nothing unless its already running */ |
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330 | #if EV_PROTOTYPES |
84 | void evio_start (struct ev_io *w); |
331 | void ev_io_start (EV_P_ struct ev_io *w); |
85 | void evio_stop (struct ev_io *w); |
332 | void ev_io_stop (EV_P_ struct ev_io *w); |
86 | |
333 | |
87 | void evtimer_start (struct ev_timer *w); |
334 | void ev_timer_start (EV_P_ struct ev_timer *w); |
88 | void evtimer_stop (struct ev_timer *w); |
335 | void ev_timer_stop (EV_P_ struct ev_timer *w); |
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336 | /* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */ |
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337 | void ev_timer_again (EV_P_ struct ev_timer *w); |
89 | |
338 | |
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339 | void ev_periodic_start (EV_P_ struct ev_periodic *w); |
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340 | void ev_periodic_stop (EV_P_ struct ev_periodic *w); |
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341 | |
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342 | void ev_idle_start (EV_P_ struct ev_idle *w); |
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343 | void ev_idle_stop (EV_P_ struct ev_idle *w); |
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344 | |
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345 | void ev_prepare_start (EV_P_ struct ev_prepare *w); |
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346 | void ev_prepare_stop (EV_P_ struct ev_prepare *w); |
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347 | |
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348 | void ev_check_start (EV_P_ struct ev_check *w); |
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349 | void ev_check_stop (EV_P_ struct ev_check *w); |
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350 | |
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351 | /* only supported in the default loop */ |
90 | void evsignal_start (struct ev_signal *w); |
352 | void ev_signal_start (EV_P_ struct ev_signal *w); |
91 | void evsignal_stop (struct ev_signal *w); |
353 | void ev_signal_stop (EV_P_ struct ev_signal *w); |
92 | |
354 | |
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355 | /* only supported in the default loop */ |
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356 | void ev_child_start (EV_P_ struct ev_child *w); |
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357 | void ev_child_stop (EV_P_ struct ev_child *w); |
93 | #endif |
358 | #endif |
94 | |
359 | |
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360 | #ifdef __cplusplus |
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361 | } |
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362 | #endif |
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363 | |
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364 | #endif |
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365 | |