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