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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 | |
4 | typedef double ev_tstamp; |
33 | typedef double ev_tstamp; |
5 | |
34 | |
6 | /* eventmask, revents, events... */ |
35 | /* eventmask, revents, events... */ |
7 | #define EV_UNDEF -1 /* guaranteed to be invalid */ |
36 | #define EV_UNDEF -1 /* guaranteed to be invalid */ |
8 | #define EV_NONE 0 |
37 | #define EV_NONE 0x00 |
9 | #define EV_READ 1 |
38 | #define EV_READ 0x01 |
10 | #define EV_WRITE 2 |
39 | #define EV_WRITE 0x02 |
11 | #define EV_TIMEOUT 4 |
40 | #define EV_TIMEOUT 0x04 |
12 | #define EV_SIGNAL 8 |
41 | #define EV_SIGNAL 0x08 |
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42 | #define EV_IDLE 0x10 |
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43 | #define EV_CHECK 0x20 |
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44 | #define EV_PREPARE 0x40 |
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45 | #define EV_CHILD 0x80 |
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46 | #define EV_ERROR (0xff|0x8000) |
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47 | |
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48 | /* can be used to add custom fields to all watchers */ |
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49 | #ifndef EV_COMMON |
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50 | # define EV_COMMON void *data |
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51 | #endif |
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52 | #ifndef EV_PROTOTYPES |
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53 | # define EV_PROTOTYPES 1 |
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54 | #endif |
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55 | |
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56 | /* |
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57 | * struct member types: |
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58 | * private: you can look at them, but not change them, and they might not mean anything to you. |
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59 | * ro: can be read anytime, but only changed when the watcher isn't active |
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60 | * rw: can be read and modified anytime, even when the watcher is active |
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61 | */ |
13 | |
62 | |
14 | /* shared by all watchers */ |
63 | /* shared by all watchers */ |
15 | #define EV_WATCHER(type) \ |
64 | #define EV_WATCHER(type) \ |
16 | int active; /* private */ \ |
65 | int active; /* private */ \ |
17 | int pending; /* private */ \ |
66 | int pending; /* private */ \ |
18 | void *data; /* rw */ \ |
67 | EV_COMMON; /* rw */ \ |
19 | void (*cb)(struct type *, int revents) /* rw */ |
68 | void (*cb)(struct type *, int revents); /* rw */ /* gets invoked with an eventmask */ |
20 | |
69 | |
21 | #define EV_WATCHER_LIST(type) \ |
70 | #define EV_WATCHER_LIST(type) \ |
22 | EV_WATCHER (type); \ |
71 | EV_WATCHER (type); \ |
23 | struct type *next /* private */ |
72 | struct type *next /* private */ |
24 | |
73 | |
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74 | #define EV_WATCHER_TIME(type) \ |
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75 | EV_WATCHER (type); \ |
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76 | ev_tstamp at /* private */ |
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77 | |
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78 | /* base class, nothing to see here unless you subclass */ |
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79 | struct ev_watcher { |
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80 | EV_WATCHER (ev_watcher); |
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81 | }; |
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82 | |
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83 | /* base class, nothing to see here unless you subclass */ |
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84 | struct ev_watcher_list { |
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85 | EV_WATCHER_LIST (ev_watcher_list); |
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86 | }; |
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87 | |
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88 | /* base class, nothing to see here unless you subclass */ |
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89 | struct ev_watcher_time { |
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90 | EV_WATCHER_TIME (ev_watcher_time); |
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91 | }; |
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92 | |
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93 | /* invoked after a specific time, repeatable (based on monotonic clock) */ |
25 | struct ev_timer |
94 | struct ev_timer |
26 | { |
95 | { |
27 | EV_WATCHER_LIST (ev_timer); |
96 | EV_WATCHER_TIME (ev_timer); |
28 | |
97 | |
29 | ev_tstamp at; /* ro */ |
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30 | ev_tstamp repeat; /* rw */ |
98 | ev_tstamp repeat; /* rw */ |
31 | unsigned char is_abs; /* rw */ |
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32 | }; |
99 | }; |
33 | |
100 | |
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101 | /* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */ |
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102 | struct ev_periodic |
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103 | { |
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104 | EV_WATCHER_TIME (ev_periodic); |
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105 | |
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106 | ev_tstamp interval; /* rw */ |
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107 | }; |
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108 | |
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109 | /* invoked when fd is either EV_READable or EV_WRITEable */ |
34 | struct ev_io |
110 | struct ev_io |
35 | { |
111 | { |
36 | EV_WATCHER_LIST (ev_io); |
112 | EV_WATCHER_LIST (ev_io); |
37 | |
113 | |
38 | int fd; /* ro */ |
114 | int fd; /* ro */ |
39 | int events; /* ro */ |
115 | int events; /* ro */ |
40 | }; |
116 | }; |
41 | |
117 | |
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118 | /* invoked when the given signal has been received */ |
42 | struct ev_signal |
119 | struct ev_signal |
43 | { |
120 | { |
44 | EV_WATCHER_LIST (ev_signal); |
121 | EV_WATCHER_LIST (ev_signal); |
45 | |
122 | |
46 | int signum; /* ro */ |
123 | int signum; /* ro */ |
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124 | }; |
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125 | |
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126 | /* invoked when the nothing else needs to be done, keeps the process from blocking */ |
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127 | struct ev_idle |
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128 | { |
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129 | EV_WATCHER (ev_idle); |
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130 | }; |
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131 | |
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132 | /* invoked for each run of the mainloop, just before the blocking call */ |
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133 | /* you can still change events in any way you like */ |
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134 | struct ev_prepare |
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135 | { |
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136 | EV_WATCHER (ev_prepare); |
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137 | }; |
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138 | |
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139 | /* invoked for each run of the mainloop, just after the blocking call */ |
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140 | struct ev_check |
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141 | { |
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142 | EV_WATCHER (ev_check); |
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143 | }; |
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144 | |
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145 | /* invoked when sigchld is received and waitpid indicates the givne pid */ |
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146 | struct ev_child |
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147 | { |
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148 | EV_WATCHER_LIST (ev_child); |
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149 | |
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150 | int pid; /* ro */ |
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151 | int status; /* holds the exit status, use the macros from sys/wait.h */ |
47 | }; |
152 | }; |
48 | |
153 | |
49 | #define EVMETHOD_NONE 0 |
154 | #define EVMETHOD_NONE 0 |
50 | #define EVMETHOD_SELECT 1 |
155 | #define EVMETHOD_SELECT 1 |
51 | #define EVMETHOD_EPOLL 2 |
156 | #define EVMETHOD_EPOLL 2 |
52 | int ev_init (int flags); |
157 | #if EV_PROTOTYPES |
53 | extern int ev_method; |
158 | extern int ev_method; |
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159 | int ev_init (int flags); /* returns ev_method */ |
54 | |
160 | |
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161 | /* these three calls are suitable for plugging into pthread_atfork */ |
55 | void ev_prefork (void); |
162 | void ev_prefork (void); |
56 | void ev_postfork_parent (void); |
163 | void ev_postfork_parent (void); |
57 | void ev_postfork_child (void); |
164 | void ev_postfork_child (void); |
58 | |
165 | |
59 | extern ev_tstamp ev_now; /* time w.r.t. timers and the eventloop, updated after each poll */ |
166 | extern ev_tstamp ev_now; /* time w.r.t. timers and the eventloop, updated after each poll */ |
60 | ev_tstamp ev_time (void); |
167 | ev_tstamp ev_time (void); |
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168 | #endif |
61 | |
169 | |
62 | #define EVLOOP_NONBLOCK 1 /* do not block/wait */ |
170 | #define EVLOOP_NONBLOCK 1 /* do not block/wait */ |
63 | #define EVLOOP_ONESHOT 2 /* block *once* only */ |
171 | #define EVLOOP_ONESHOT 2 /* block *once* only */ |
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172 | #if EV_PROTOTYPES |
64 | int ev_loop (int flags); |
173 | void ev_loop (int flags); |
65 | extern int ev_loop_done; /* set to 1 to break out of event loop */ |
174 | extern int ev_loop_done; /* set to 1 to break out of event loop, set to 2 to break out of all event loops */ |
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175 | |
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176 | /* convinience function, wait for a single event, without registering an event watcher */ |
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177 | /* if timeout is < 0, do wait indefinitely */ |
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178 | void ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg); |
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179 | #endif |
66 | |
180 | |
67 | /* these may evaluate ev multiple times, and the other arguments at most once */ |
181 | /* these may evaluate ev multiple times, and the other arguments at most once */ |
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182 | /* either use evw_init + evXXX_set, or the evXXX_init macro, below, to first initialise a watcher */ |
68 | #define evw_init(ev,cb_,data_) do { (ev)->active = 0; (ev)->cb = (cb_); (ev)->data = (void *)data_; } while (0) |
183 | #define evw_init(ev,cb_) do { (ev)->active = 0; (ev)->pending = 0; (ev)->cb = (cb_); } while (0) |
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184 | |
69 | #define evio_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0) |
185 | #define evio_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0) |
70 | #define evtimer_set_rel(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); (ev)->is_abs = 0; } while (0) |
186 | #define evtimer_set(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0) |
71 | #define evtimer_set_abs(ev,at_,repeat_) do { (ev)->at = (at_); (ev)->repeat = (repeat_); (ev)->is_abs = 1; } while (0) |
187 | #define evperiodic_set(ev,at_,interval_) do { (ev)->at = (at_); (ev)->interval = (interval_); } while (0) |
72 | #define evsignal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0) |
188 | #define evsignal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0) |
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189 | #define evidle_set(ev) /* nop, yes, this is a serious in-joke */ |
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190 | #define evprepare_set(ev) /* nop, yes, this is a serious in-joke */ |
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191 | #define evcheck_set(ev) /* nop, yes, this is a serious in-joke */ |
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192 | #define evchild_set(ev,pid_) do { (ev)->pid = (pid_); } while (0) |
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193 | |
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194 | #define evio_init(ev,cb,fd,events) do { evw_init ((ev), (cb)); evio_set ((ev),(fd),(events)); } while (0) |
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195 | #define evtimer_init(ev,cb,after,repeat) do { evw_init ((ev), (cb)); evtimer_set ((ev),(after),(repeat)); } while (0) |
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196 | #define evperiodic_init(ev,cb,at,interval) do { evw_init ((ev), (cb)); evperiodic_set ((ev),(at),(interval)); } while (0) |
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197 | #define evsignal_init(ev,cb,signum) do { evw_init ((ev), (cb)); evsignal_set ((ev), (signum)); } while (0) |
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198 | #define evidle_init(ev,cb) do { evw_init ((ev), (cb)); evidle_set ((ev)); } while (0) |
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199 | #define evprepare_init(ev,cb) do { evw_init ((ev), (cb)); evprepare_set ((ev)); } while (0) |
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200 | #define evcheck_init(ev,cb) do { evw_init ((ev), (cb)); evcheck_set ((ev)); } while (0) |
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201 | #define evchild_init(ev,cb,pid) do { evw_init ((ev), (cb)); evchild_set ((ev),(pid)); } while (0) |
73 | |
202 | |
74 | #define ev_is_active(ev) (0 + (ev)->active) /* true when the watcher has been started */ |
203 | #define ev_is_active(ev) (0 + (ev)->active) /* true when the watcher has been started */ |
75 | |
204 | |
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205 | /* stopping (enabling, adding) a watcher does nothing if it is already running */ |
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206 | /* stopping (disabling, deleting) a watcher does nothing unless its already running */ |
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207 | #if EV_PROTOTYPES |
76 | void evio_start (struct ev_io *w); |
208 | void evio_start (struct ev_io *w); |
77 | void evio_stop (struct ev_io *w); |
209 | void evio_stop (struct ev_io *w); |
78 | |
210 | |
79 | void evtimer_start (struct ev_timer *w); |
211 | void evtimer_start (struct ev_timer *w); |
80 | void evtimer_stop (struct ev_timer *w); |
212 | void evtimer_stop (struct ev_timer *w); |
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213 | void evtimer_again (struct ev_timer *w); /* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */ |
81 | |
214 | |
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215 | void evperiodic_start (struct ev_periodic *w); |
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216 | void evperiodic_stop (struct ev_periodic *w); |
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217 | |
82 | void evsignal_start (struct ev_signal *w); |
218 | void evsignal_start (struct ev_signal *w); |
83 | void evsignal_stop (struct ev_signal *w); |
219 | void evsignal_stop (struct ev_signal *w); |
84 | |
220 | |
85 | #endif |
221 | void evidle_start (struct ev_idle *w); |
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222 | void evidle_stop (struct ev_idle *w); |
86 | |
223 | |
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224 | void evprepare_start (struct ev_prepare *w); |
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225 | void evprepare_stop (struct ev_prepare *w); |
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226 | |
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227 | void evcheck_start (struct ev_check *w); |
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228 | void evcheck_stop (struct ev_check *w); |
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229 | |
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230 | void evchild_start (struct ev_child *w); |
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231 | void evchild_stop (struct ev_child *w); |
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232 | #endif |
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233 | |
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234 | #endif |
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235 | |