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4 | <head> |
4 | <head> |
5 | <title>libev</title> |
5 | <title>libev</title> |
6 | <meta name="description" content="Pod documentation for libev" /> |
6 | <meta name="description" content="Pod documentation for libev" /> |
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9 | <meta name="created" content="Tue Nov 27 21:14:27 2007" /> |
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12 | <body> |
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13 | <div class="pod"> |
13 | <div class="pod"> |
14 | <!-- INDEX START --> |
14 | <!-- INDEX START --> |
15 | <h3 id="TOP">Index</h3> |
15 | <h3 id="TOP">Index</h3> |
16 | |
16 | |
17 | <ul><li><a href="#NAME">NAME</a></li> |
17 | <ul><li><a href="#NAME">NAME</a></li> |
18 | <li><a href="#SYNOPSIS">SYNOPSIS</a></li> |
18 | <li><a href="#SYNOPSIS">SYNOPSIS</a></li> |
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19 | <li><a href="#EXAMPLE_PROGRAM">EXAMPLE PROGRAM</a></li> |
19 | <li><a href="#DESCRIPTION">DESCRIPTION</a></li> |
20 | <li><a href="#DESCRIPTION">DESCRIPTION</a></li> |
20 | <li><a href="#FEATURES">FEATURES</a></li> |
21 | <li><a href="#FEATURES">FEATURES</a></li> |
21 | <li><a href="#CONVENTIONS">CONVENTIONS</a></li> |
22 | <li><a href="#CONVENTIONS">CONVENTIONS</a></li> |
22 | <li><a href="#TIME_REPRESENTATION">TIME REPRESENTATION</a></li> |
23 | <li><a href="#TIME_REPRESENTATION">TIME REPRESENTATION</a></li> |
23 | <li><a href="#GLOBAL_FUNCTIONS">GLOBAL FUNCTIONS</a></li> |
24 | <li><a href="#GLOBAL_FUNCTIONS">GLOBAL FUNCTIONS</a></li> |
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66 | <p>libev - a high performance full-featured event loop written in C</p> |
67 | <p>libev - a high performance full-featured event loop written in C</p> |
67 | |
68 | |
68 | </div> |
69 | </div> |
69 | <h1 id="SYNOPSIS">SYNOPSIS</h1><p><a href="#TOP" class="toplink">Top</a></p> |
70 | <h1 id="SYNOPSIS">SYNOPSIS</h1><p><a href="#TOP" class="toplink">Top</a></p> |
70 | <div id="SYNOPSIS_CONTENT"> |
71 | <div id="SYNOPSIS_CONTENT"> |
71 | <pre> /* this is the only header you need */ |
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72 | #include <ev.h> |
72 | <pre> #include <ev.h> |
73 | |
73 | |
74 | /* what follows is a fully working example program */ |
74 | </pre> |
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75 | |
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76 | </div> |
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77 | <h1 id="EXAMPLE_PROGRAM">EXAMPLE PROGRAM</h1><p><a href="#TOP" class="toplink">Top</a></p> |
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78 | <div id="EXAMPLE_PROGRAM_CONTENT"> |
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79 | <pre> #include <ev.h> |
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80 | |
75 | ev_io stdin_watcher; |
81 | ev_io stdin_watcher; |
76 | ev_timer timeout_watcher; |
82 | ev_timer timeout_watcher; |
77 | |
83 | |
78 | /* called when data readable on stdin */ |
84 | /* called when data readable on stdin */ |
79 | static void |
85 | static void |
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127 | watcher.</p> |
133 | watcher.</p> |
128 | |
134 | |
129 | </div> |
135 | </div> |
130 | <h1 id="FEATURES">FEATURES</h1><p><a href="#TOP" class="toplink">Top</a></p> |
136 | <h1 id="FEATURES">FEATURES</h1><p><a href="#TOP" class="toplink">Top</a></p> |
131 | <div id="FEATURES_CONTENT"> |
137 | <div id="FEATURES_CONTENT"> |
132 | <p>Libev supports select, poll, the linux-specific epoll and the bsd-specific |
138 | <p>Libev supports <code>select</code>, <code>poll</code>, the linux-specific <code>epoll</code>, the |
133 | kqueue mechanisms for file descriptor events, relative timers, absolute |
139 | bsd-specific <code>kqueue</code> and the solaris-specific event port mechanisms |
134 | timers with customised rescheduling, signal events, process status change |
140 | for file descriptor events (<code>ev_io</code>), relative timers (<code>ev_timer</code>), |
135 | events (related to SIGCHLD), and event watchers dealing with the event |
141 | absolute timers with customised rescheduling (<code>ev_periodic</code>), synchronous |
136 | loop mechanism itself (idle, prepare and check watchers). It also is quite |
142 | signals (<code>ev_signal</code>), process status change events (<code>ev_child</code>), and |
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143 | event watchers dealing with the event loop mechanism itself (<code>ev_idle</code>, |
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144 | <code>ev_embed</code>, <code>ev_prepare</code> and <code>ev_check</code> watchers) as well as |
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145 | file watchers (<code>ev_stat</code>) and even limited support for fork events |
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146 | (<code>ev_fork</code>).</p> |
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147 | <p>It also is quite fast (see this |
137 | fast (see this <a href="http://libev.schmorp.de/bench.html">benchmark</a> comparing |
148 | <a href="http://libev.schmorp.de/bench.html">benchmark</a> comparing it to libevent |
138 | it to libevent for example).</p> |
149 | for example).</p> |
139 | |
150 | |
140 | </div> |
151 | </div> |
141 | <h1 id="CONVENTIONS">CONVENTIONS</h1><p><a href="#TOP" class="toplink">Top</a></p> |
152 | <h1 id="CONVENTIONS">CONVENTIONS</h1><p><a href="#TOP" class="toplink">Top</a></p> |
142 | <div id="CONVENTIONS_CONTENT"> |
153 | <div id="CONVENTIONS_CONTENT"> |
143 | <p>Libev is very configurable. In this manual the default configuration |
154 | <p>Libev is very configurable. In this manual the default configuration will |
144 | will be described, which supports multiple event loops. For more info |
155 | be described, which supports multiple event loops. For more info about |
145 | about various configuration options please have a look at the file |
156 | various configuration options please have a look at <strong>EMBED</strong> section in |
146 | <cite>README.embed</cite> in the libev distribution. If libev was configured without |
157 | this manual. If libev was configured without support for multiple event |
147 | support for multiple event loops, then all functions taking an initial |
158 | loops, then all functions taking an initial argument of name <code>loop</code> |
148 | argument of name <code>loop</code> (which is always of type <code>struct ev_loop *</code>) |
159 | (which is always of type <code>struct ev_loop *</code>) will not have this argument.</p> |
149 | will not have this argument.</p> |
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150 | |
160 | |
151 | </div> |
161 | </div> |
152 | <h1 id="TIME_REPRESENTATION">TIME REPRESENTATION</h1><p><a href="#TOP" class="toplink">Top</a></p> |
162 | <h1 id="TIME_REPRESENTATION">TIME REPRESENTATION</h1><p><a href="#TOP" class="toplink">Top</a></p> |
153 | <div id="TIME_REPRESENTATION_CONTENT"> |
163 | <div id="TIME_REPRESENTATION_CONTENT"> |
154 | <p>Libev represents time as a single floating point number, representing the |
164 | <p>Libev represents time as a single floating point number, representing the |
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180 | version of the library your program was compiled against.</p> |
190 | version of the library your program was compiled against.</p> |
181 | <p>Usually, it's a good idea to terminate if the major versions mismatch, |
191 | <p>Usually, it's a good idea to terminate if the major versions mismatch, |
182 | as this indicates an incompatible change. Minor versions are usually |
192 | as this indicates an incompatible change. Minor versions are usually |
183 | compatible to older versions, so a larger minor version alone is usually |
193 | compatible to older versions, so a larger minor version alone is usually |
184 | not a problem.</p> |
194 | not a problem.</p> |
185 | <p>Example: make sure we haven't accidentally been linked against the wrong |
195 | <p>Example: Make sure we haven't accidentally been linked against the wrong |
186 | version:</p> |
196 | version.</p> |
187 | <pre> assert (("libev version mismatch", |
197 | <pre> assert (("libev version mismatch", |
188 | ev_version_major () == EV_VERSION_MAJOR |
198 | ev_version_major () == EV_VERSION_MAJOR |
189 | && ev_version_minor () >= EV_VERSION_MINOR)); |
199 | && ev_version_minor () >= EV_VERSION_MINOR)); |
190 | |
200 | |
191 | </pre> |
201 | </pre> |
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229 | allocated, the library might abort or take some potentially destructive |
239 | allocated, the library might abort or take some potentially destructive |
230 | action. The default is your system realloc function.</p> |
240 | action. The default is your system realloc function.</p> |
231 | <p>You could override this function in high-availability programs to, say, |
241 | <p>You could override this function in high-availability programs to, say, |
232 | free some memory if it cannot allocate memory, to use a special allocator, |
242 | free some memory if it cannot allocate memory, to use a special allocator, |
233 | or even to sleep a while and retry until some memory is available.</p> |
243 | or even to sleep a while and retry until some memory is available.</p> |
234 | <p>Example: replace the libev allocator with one that waits a bit and then |
244 | <p>Example: Replace the libev allocator with one that waits a bit and then |
235 | retries: better than mine).</p> |
245 | retries).</p> |
236 | <pre> static void * |
246 | <pre> static void * |
237 | persistent_realloc (void *ptr, size_t size) |
247 | persistent_realloc (void *ptr, size_t size) |
238 | { |
248 | { |
239 | for (;;) |
249 | for (;;) |
240 | { |
250 | { |
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259 | indicating the system call or subsystem causing the problem. If this |
269 | indicating the system call or subsystem causing the problem. If this |
260 | callback is set, then libev will expect it to remedy the sitution, no |
270 | callback is set, then libev will expect it to remedy the sitution, no |
261 | matter what, when it returns. That is, libev will generally retry the |
271 | matter what, when it returns. That is, libev will generally retry the |
262 | requested operation, or, if the condition doesn't go away, do bad stuff |
272 | requested operation, or, if the condition doesn't go away, do bad stuff |
263 | (such as abort).</p> |
273 | (such as abort).</p> |
264 | <p>Example: do the same thing as libev does internally:</p> |
274 | <p>Example: This is basically the same thing that libev does internally, too.</p> |
265 | <pre> static void |
275 | <pre> static void |
266 | fatal_error (const char *msg) |
276 | fatal_error (const char *msg) |
267 | { |
277 | { |
268 | perror (msg); |
278 | perror (msg); |
269 | abort (); |
279 | abort (); |
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405 | <dd> |
415 | <dd> |
406 | <p>Similar to <code>ev_default_loop</code>, but always creates a new event loop that is |
416 | <p>Similar to <code>ev_default_loop</code>, but always creates a new event loop that is |
407 | always distinct from the default loop. Unlike the default loop, it cannot |
417 | always distinct from the default loop. Unlike the default loop, it cannot |
408 | handle signal and child watchers, and attempts to do so will be greeted by |
418 | handle signal and child watchers, and attempts to do so will be greeted by |
409 | undefined behaviour (or a failed assertion if assertions are enabled).</p> |
419 | undefined behaviour (or a failed assertion if assertions are enabled).</p> |
410 | <p>Example: try to create a event loop that uses epoll and nothing else.</p> |
420 | <p>Example: Try to create a event loop that uses epoll and nothing else.</p> |
411 | <pre> struct ev_loop *epoller = ev_loop_new (EVBACKEND_EPOLL | EVFLAG_NOENV); |
421 | <pre> struct ev_loop *epoller = ev_loop_new (EVBACKEND_EPOLL | EVFLAG_NOENV); |
412 | if (!epoller) |
422 | if (!epoller) |
413 | fatal ("no epoll found here, maybe it hides under your chair"); |
423 | fatal ("no epoll found here, maybe it hides under your chair"); |
414 | |
424 | |
415 | </pre> |
425 | </pre> |
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508 | be handled here by queueing them when their watcher gets executed. |
518 | be handled here by queueing them when their watcher gets executed. |
509 | - If ev_unloop has been called or EVLOOP_ONESHOT or EVLOOP_NONBLOCK |
519 | - If ev_unloop has been called or EVLOOP_ONESHOT or EVLOOP_NONBLOCK |
510 | were used, return, otherwise continue with step *. |
520 | were used, return, otherwise continue with step *. |
511 | |
521 | |
512 | </pre> |
522 | </pre> |
513 | <p>Example: queue some jobs and then loop until no events are outsanding |
523 | <p>Example: Queue some jobs and then loop until no events are outsanding |
514 | anymore.</p> |
524 | anymore.</p> |
515 | <pre> ... queue jobs here, make sure they register event watchers as long |
525 | <pre> ... queue jobs here, make sure they register event watchers as long |
516 | ... as they still have work to do (even an idle watcher will do..) |
526 | ... as they still have work to do (even an idle watcher will do..) |
517 | ev_loop (my_loop, 0); |
527 | ev_loop (my_loop, 0); |
518 | ... jobs done. yeah! |
528 | ... jobs done. yeah! |
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537 | example, libev itself uses this for its internal signal pipe: It is not |
547 | example, libev itself uses this for its internal signal pipe: It is not |
538 | visible to the libev user and should not keep <code>ev_loop</code> from exiting if |
548 | visible to the libev user and should not keep <code>ev_loop</code> from exiting if |
539 | no event watchers registered by it are active. It is also an excellent |
549 | no event watchers registered by it are active. It is also an excellent |
540 | way to do this for generic recurring timers or from within third-party |
550 | way to do this for generic recurring timers or from within third-party |
541 | libraries. Just remember to <i>unref after start</i> and <i>ref before stop</i>.</p> |
551 | libraries. Just remember to <i>unref after start</i> and <i>ref before stop</i>.</p> |
542 | <p>Example: create a signal watcher, but keep it from keeping <code>ev_loop</code> |
552 | <p>Example: Create a signal watcher, but keep it from keeping <code>ev_loop</code> |
543 | running when nothing else is active.</p> |
553 | running when nothing else is active.</p> |
544 | <pre> struct dv_signal exitsig; |
554 | <pre> struct ev_signal exitsig; |
545 | ev_signal_init (&exitsig, sig_cb, SIGINT); |
555 | ev_signal_init (&exitsig, sig_cb, SIGINT); |
546 | ev_signal_start (myloop, &exitsig); |
556 | ev_signal_start (loop, &exitsig); |
547 | evf_unref (myloop); |
557 | evf_unref (loop); |
548 | |
558 | |
549 | </pre> |
559 | </pre> |
550 | <p>Example: for some weird reason, unregister the above signal handler again.</p> |
560 | <p>Example: For some weird reason, unregister the above signal handler again.</p> |
551 | <pre> ev_ref (myloop); |
561 | <pre> ev_ref (loop); |
552 | ev_signal_stop (myloop, &exitsig); |
562 | ev_signal_stop (loop, &exitsig); |
553 | |
563 | |
554 | </pre> |
564 | </pre> |
555 | </dd> |
565 | </dd> |
556 | </dl> |
566 | </dl> |
557 | |
567 | |
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851 | <dt>int events [read-only]</dt> |
861 | <dt>int events [read-only]</dt> |
852 | <dd> |
862 | <dd> |
853 | <p>The events being watched.</p> |
863 | <p>The events being watched.</p> |
854 | </dd> |
864 | </dd> |
855 | </dl> |
865 | </dl> |
856 | <p>Example: call <code>stdin_readable_cb</code> when STDIN_FILENO has become, well |
866 | <p>Example: Call <code>stdin_readable_cb</code> when STDIN_FILENO has become, well |
857 | readable, but only once. Since it is likely line-buffered, you could |
867 | readable, but only once. Since it is likely line-buffered, you could |
858 | attempt to read a whole line in the callback:</p> |
868 | attempt to read a whole line in the callback.</p> |
859 | <pre> static void |
869 | <pre> static void |
860 | stdin_readable_cb (struct ev_loop *loop, struct ev_io *w, int revents) |
870 | stdin_readable_cb (struct ev_loop *loop, struct ev_io *w, int revents) |
861 | { |
871 | { |
862 | ev_io_stop (loop, w); |
872 | ev_io_stop (loop, w); |
863 | .. read from stdin here (or from w->fd) and haqndle any I/O errors |
873 | .. read from stdin here (or from w->fd) and haqndle any I/O errors |
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946 | <p>The current <code>repeat</code> value. Will be used each time the watcher times out |
956 | <p>The current <code>repeat</code> value. Will be used each time the watcher times out |
947 | or <code>ev_timer_again</code> is called and determines the next timeout (if any), |
957 | or <code>ev_timer_again</code> is called and determines the next timeout (if any), |
948 | which is also when any modifications are taken into account.</p> |
958 | which is also when any modifications are taken into account.</p> |
949 | </dd> |
959 | </dd> |
950 | </dl> |
960 | </dl> |
951 | <p>Example: create a timer that fires after 60 seconds.</p> |
961 | <p>Example: Create a timer that fires after 60 seconds.</p> |
952 | <pre> static void |
962 | <pre> static void |
953 | one_minute_cb (struct ev_loop *loop, struct ev_timer *w, int revents) |
963 | one_minute_cb (struct ev_loop *loop, struct ev_timer *w, int revents) |
954 | { |
964 | { |
955 | .. one minute over, w is actually stopped right here |
965 | .. one minute over, w is actually stopped right here |
956 | } |
966 | } |
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958 | struct ev_timer mytimer; |
968 | struct ev_timer mytimer; |
959 | ev_timer_init (&mytimer, one_minute_cb, 60., 0.); |
969 | ev_timer_init (&mytimer, one_minute_cb, 60., 0.); |
960 | ev_timer_start (loop, &mytimer); |
970 | ev_timer_start (loop, &mytimer); |
961 | |
971 | |
962 | </pre> |
972 | </pre> |
963 | <p>Example: create a timeout timer that times out after 10 seconds of |
973 | <p>Example: Create a timeout timer that times out after 10 seconds of |
964 | inactivity.</p> |
974 | inactivity.</p> |
965 | <pre> static void |
975 | <pre> static void |
966 | timeout_cb (struct ev_loop *loop, struct ev_timer *w, int revents) |
976 | timeout_cb (struct ev_loop *loop, struct ev_timer *w, int revents) |
967 | { |
977 | { |
968 | .. ten seconds without any activity |
978 | .. ten seconds without any activity |
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1084 | <p>The current reschedule callback, or <code>0</code>, if this functionality is |
1094 | <p>The current reschedule callback, or <code>0</code>, if this functionality is |
1085 | switched off. Can be changed any time, but changes only take effect when |
1095 | switched off. Can be changed any time, but changes only take effect when |
1086 | the periodic timer fires or <code>ev_periodic_again</code> is being called.</p> |
1096 | the periodic timer fires or <code>ev_periodic_again</code> is being called.</p> |
1087 | </dd> |
1097 | </dd> |
1088 | </dl> |
1098 | </dl> |
1089 | <p>Example: call a callback every hour, or, more precisely, whenever the |
1099 | <p>Example: Call a callback every hour, or, more precisely, whenever the |
1090 | system clock is divisible by 3600. The callback invocation times have |
1100 | system clock is divisible by 3600. The callback invocation times have |
1091 | potentially a lot of jittering, but good long-term stability.</p> |
1101 | potentially a lot of jittering, but good long-term stability.</p> |
1092 | <pre> static void |
1102 | <pre> static void |
1093 | clock_cb (struct ev_loop *loop, struct ev_io *w, int revents) |
1103 | clock_cb (struct ev_loop *loop, struct ev_io *w, int revents) |
1094 | { |
1104 | { |
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… | |
1098 | struct ev_periodic hourly_tick; |
1108 | struct ev_periodic hourly_tick; |
1099 | ev_periodic_init (&hourly_tick, clock_cb, 0., 3600., 0); |
1109 | ev_periodic_init (&hourly_tick, clock_cb, 0., 3600., 0); |
1100 | ev_periodic_start (loop, &hourly_tick); |
1110 | ev_periodic_start (loop, &hourly_tick); |
1101 | |
1111 | |
1102 | </pre> |
1112 | </pre> |
1103 | <p>Example: the same as above, but use a reschedule callback to do it:</p> |
1113 | <p>Example: The same as above, but use a reschedule callback to do it:</p> |
1104 | <pre> #include <math.h> |
1114 | <pre> #include <math.h> |
1105 | |
1115 | |
1106 | static ev_tstamp |
1116 | static ev_tstamp |
1107 | my_scheduler_cb (struct ev_periodic *w, ev_tstamp now) |
1117 | my_scheduler_cb (struct ev_periodic *w, ev_tstamp now) |
1108 | { |
1118 | { |
… | |
… | |
1110 | } |
1120 | } |
1111 | |
1121 | |
1112 | ev_periodic_init (&hourly_tick, clock_cb, 0., 0., my_scheduler_cb); |
1122 | ev_periodic_init (&hourly_tick, clock_cb, 0., 0., my_scheduler_cb); |
1113 | |
1123 | |
1114 | </pre> |
1124 | </pre> |
1115 | <p>Example: call a callback every hour, starting now:</p> |
1125 | <p>Example: Call a callback every hour, starting now:</p> |
1116 | <pre> struct ev_periodic hourly_tick; |
1126 | <pre> struct ev_periodic hourly_tick; |
1117 | ev_periodic_init (&hourly_tick, clock_cb, |
1127 | ev_periodic_init (&hourly_tick, clock_cb, |
1118 | fmod (ev_now (loop), 3600.), 3600., 0); |
1128 | fmod (ev_now (loop), 3600.), 3600., 0); |
1119 | ev_periodic_start (loop, &hourly_tick); |
1129 | ev_periodic_start (loop, &hourly_tick); |
1120 | |
1130 | |
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1181 | <dd> |
1191 | <dd> |
1182 | <p>The process exit/trace status caused by <code>rpid</code> (see your systems |
1192 | <p>The process exit/trace status caused by <code>rpid</code> (see your systems |
1183 | <code>waitpid</code> and <code>sys/wait.h</code> documentation for details).</p> |
1193 | <code>waitpid</code> and <code>sys/wait.h</code> documentation for details).</p> |
1184 | </dd> |
1194 | </dd> |
1185 | </dl> |
1195 | </dl> |
1186 | <p>Example: try to exit cleanly on SIGINT and SIGTERM.</p> |
1196 | <p>Example: Try to exit cleanly on SIGINT and SIGTERM.</p> |
1187 | <pre> static void |
1197 | <pre> static void |
1188 | sigint_cb (struct ev_loop *loop, struct ev_signal *w, int revents) |
1198 | sigint_cb (struct ev_loop *loop, struct ev_signal *w, int revents) |
1189 | { |
1199 | { |
1190 | ev_unloop (loop, EVUNLOOP_ALL); |
1200 | ev_unloop (loop, EVUNLOOP_ALL); |
1191 | } |
1201 | } |
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1314 | <p>Initialises and configures the idle watcher - it has no parameters of any |
1324 | <p>Initialises and configures the idle watcher - it has no parameters of any |
1315 | kind. There is a <code>ev_idle_set</code> macro, but using it is utterly pointless, |
1325 | kind. There is a <code>ev_idle_set</code> macro, but using it is utterly pointless, |
1316 | believe me.</p> |
1326 | believe me.</p> |
1317 | </dd> |
1327 | </dd> |
1318 | </dl> |
1328 | </dl> |
1319 | <p>Example: dynamically allocate an <code>ev_idle</code>, start it, and in the |
1329 | <p>Example: Dynamically allocate an <code>ev_idle</code> watcher, start it, and in the |
1320 | callback, free it. Alos, use no error checking, as usual.</p> |
1330 | callback, free it. Also, use no error checking, as usual.</p> |
1321 | <pre> static void |
1331 | <pre> static void |
1322 | idle_cb (struct ev_loop *loop, struct ev_idle *w, int revents) |
1332 | idle_cb (struct ev_loop *loop, struct ev_idle *w, int revents) |
1323 | { |
1333 | { |
1324 | free (w); |
1334 | free (w); |
1325 | // now do something you wanted to do when the program has |
1335 | // now do something you wanted to do when the program has |