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266 | C<LIBEV_FLAGS>. Otherwise (the default), this environment variable will |
266 | C<LIBEV_FLAGS>. Otherwise (the default), this environment variable will |
267 | override the flags completely if it is found in the environment. This is |
267 | override the flags completely if it is found in the environment. This is |
268 | useful to try out specific backends to test their performance, or to work |
268 | useful to try out specific backends to test their performance, or to work |
269 | around bugs. |
269 | around bugs. |
270 | |
270 | |
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|
271 | =item C<EVFLAG_FORKCHECK> |
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272 | |
|
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273 | Instead of calling C<ev_default_fork> or C<ev_loop_fork> manually after |
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274 | a fork, you can also make libev check for a fork in each iteration by |
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275 | enabling this flag. |
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276 | |
|
|
277 | This works by calling C<getpid ()> on every iteration of the loop, |
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278 | and thus this might slow down your event loop if you do a lot of loop |
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279 | iterations and little real work, but is usually not noticeable (on my |
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280 | Linux system for example, C<getpid> is actually a simple 5-insn sequence |
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281 | without a syscall and thus I<very> fast, but my Linux system also has |
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282 | C<pthread_atfork> which is even faster). |
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283 | |
|
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284 | The big advantage of this flag is that you can forget about fork (and |
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285 | forget about forgetting to tell libev about forking) when you use this |
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286 | flag. |
|
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287 | |
|
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288 | This flag setting cannot be overriden or specified in the C<LIBEV_FLAGS> |
|
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289 | environment variable. |
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290 | |
271 | =item C<EVBACKEND_SELECT> (value 1, portable select backend) |
291 | =item C<EVBACKEND_SELECT> (value 1, portable select backend) |
272 | |
292 | |
273 | This is your standard select(2) backend. Not I<completely> standard, as |
293 | This is your standard select(2) backend. Not I<completely> standard, as |
274 | libev tries to roll its own fd_set with no limits on the number of fds, |
294 | libev tries to roll its own fd_set with no limits on the number of fds, |
275 | but if that fails, expect a fairly low limit on the number of fds when |
295 | but if that fails, expect a fairly low limit on the number of fds when |
… | |
… | |
409 | =item ev_loop_fork (loop) |
429 | =item ev_loop_fork (loop) |
410 | |
430 | |
411 | Like C<ev_default_fork>, but acts on an event loop created by |
431 | Like C<ev_default_fork>, but acts on an event loop created by |
412 | C<ev_loop_new>. Yes, you have to call this on every allocated event loop |
432 | C<ev_loop_new>. Yes, you have to call this on every allocated event loop |
413 | after fork, and how you do this is entirely your own problem. |
433 | after fork, and how you do this is entirely your own problem. |
|
|
434 | |
|
|
435 | =item unsigned int ev_loop_count (loop) |
|
|
436 | |
|
|
437 | Returns the count of loop iterations for the loop, which is identical to |
|
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438 | the number of times libev did poll for new events. It starts at C<0> and |
|
|
439 | happily wraps around with enough iterations. |
|
|
440 | |
|
|
441 | This value can sometimes be useful as a generation counter of sorts (it |
|
|
442 | "ticks" the number of loop iterations), as it roughly corresponds with |
|
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443 | C<ev_prepare> and C<ev_check> calls. |
414 | |
444 | |
415 | =item unsigned int ev_backend (loop) |
445 | =item unsigned int ev_backend (loop) |
416 | |
446 | |
417 | Returns one of the C<EVBACKEND_*> flags indicating the event backend in |
447 | Returns one of the C<EVBACKEND_*> flags indicating the event backend in |
418 | use. |
448 | use. |
… | |
… | |
1437 | |
1467 | |
1438 | // create io watchers for each fd and a timer before blocking |
1468 | // create io watchers for each fd and a timer before blocking |
1439 | static void |
1469 | static void |
1440 | adns_prepare_cb (ev_loop *loop, ev_prepare *w, int revents) |
1470 | adns_prepare_cb (ev_loop *loop, ev_prepare *w, int revents) |
1441 | { |
1471 | { |
1442 | int timeout = 3600000;truct pollfd fds [nfd]; |
1472 | int timeout = 3600000; |
|
|
1473 | struct pollfd fds [nfd]; |
1443 | // actual code will need to loop here and realloc etc. |
1474 | // actual code will need to loop here and realloc etc. |
1444 | adns_beforepoll (ads, fds, &nfd, &timeout, timeval_from (ev_time ())); |
1475 | adns_beforepoll (ads, fds, &nfd, &timeout, timeval_from (ev_time ())); |
1445 | |
1476 | |
1446 | /* the callback is illegal, but won't be called as we stop during check */ |
1477 | /* the callback is illegal, but won't be called as we stop during check */ |
1447 | ev_timer_init (&tw, 0, timeout * 1e-3); |
1478 | ev_timer_init (&tw, 0, timeout * 1e-3); |
… | |
… | |
1828 | Similar to the other two macros, this gives you the value of the default |
1859 | Similar to the other two macros, this gives you the value of the default |
1829 | loop, if multiple loops are supported ("ev loop default"). |
1860 | loop, if multiple loops are supported ("ev loop default"). |
1830 | |
1861 | |
1831 | =back |
1862 | =back |
1832 | |
1863 | |
1833 | Example: Declare and initialise a check watcher, working regardless of |
1864 | Example: Declare and initialise a check watcher, utilising the above |
1834 | wether multiple loops are supported or not. |
1865 | macros so it will work regardless of wether multiple loops are supported |
|
|
1866 | or not. |
1835 | |
1867 | |
1836 | static void |
1868 | static void |
1837 | check_cb (EV_P_ ev_timer *w, int revents) |
1869 | check_cb (EV_P_ ev_timer *w, int revents) |
1838 | { |
1870 | { |
1839 | ev_check_stop (EV_A_ w); |
1871 | ev_check_stop (EV_A_ w); |
… | |
… | |
1841 | |
1873 | |
1842 | ev_check check; |
1874 | ev_check check; |
1843 | ev_check_init (&check, check_cb); |
1875 | ev_check_init (&check, check_cb); |
1844 | ev_check_start (EV_DEFAULT_ &check); |
1876 | ev_check_start (EV_DEFAULT_ &check); |
1845 | ev_loop (EV_DEFAULT_ 0); |
1877 | ev_loop (EV_DEFAULT_ 0); |
1846 | |
|
|
1847 | |
1878 | |
1848 | =head1 EMBEDDING |
1879 | =head1 EMBEDDING |
1849 | |
1880 | |
1850 | Libev can (and often is) directly embedded into host |
1881 | Libev can (and often is) directly embedded into host |
1851 | applications. Examples of applications that embed it include the Deliantra |
1882 | applications. Examples of applications that embed it include the Deliantra |
… | |
… | |
1891 | ev_vars.h |
1922 | ev_vars.h |
1892 | ev_wrap.h |
1923 | ev_wrap.h |
1893 | |
1924 | |
1894 | ev_win32.c required on win32 platforms only |
1925 | ev_win32.c required on win32 platforms only |
1895 | |
1926 | |
1896 | ev_select.c only when select backend is enabled (which is by default) |
1927 | ev_select.c only when select backend is enabled (which is enabled by default) |
1897 | ev_poll.c only when poll backend is enabled (disabled by default) |
1928 | ev_poll.c only when poll backend is enabled (disabled by default) |
1898 | ev_epoll.c only when the epoll backend is enabled (disabled by default) |
1929 | ev_epoll.c only when the epoll backend is enabled (disabled by default) |
1899 | ev_kqueue.c only when the kqueue backend is enabled (disabled by default) |
1930 | ev_kqueue.c only when the kqueue backend is enabled (disabled by default) |
1900 | ev_port.c only when the solaris port backend is enabled (disabled by default) |
1931 | ev_port.c only when the solaris port backend is enabled (disabled by default) |
1901 | |
1932 | |
… | |
… | |
2143 | interface) and F<EV.xs> (implementation) files. Only the F<EV.xs> file |
2174 | interface) and F<EV.xs> (implementation) files. Only the F<EV.xs> file |
2144 | will be compiled. It is pretty complex because it provides its own header |
2175 | will be compiled. It is pretty complex because it provides its own header |
2145 | file. |
2176 | file. |
2146 | |
2177 | |
2147 | The usage in rxvt-unicode is simpler. It has a F<ev_cpp.h> header file |
2178 | The usage in rxvt-unicode is simpler. It has a F<ev_cpp.h> header file |
2148 | that everybody includes and which overrides some autoconf choices: |
2179 | that everybody includes and which overrides some configure choices: |
2149 | |
2180 | |
|
|
2181 | #define EV_MINIMAL 1 |
2150 | #define EV_USE_POLL 0 |
2182 | #define EV_USE_POLL 0 |
2151 | #define EV_MULTIPLICITY 0 |
2183 | #define EV_MULTIPLICITY 0 |
2152 | #define EV_PERIODICS 0 |
2184 | #define EV_PERIODIC_ENABLE 0 |
|
|
2185 | #define EV_STAT_ENABLE 0 |
|
|
2186 | #define EV_FORK_ENABLE 0 |
2153 | #define EV_CONFIG_H <config.h> |
2187 | #define EV_CONFIG_H <config.h> |
|
|
2188 | #define EV_MINPRI 0 |
|
|
2189 | #define EV_MAXPRI 0 |
2154 | |
2190 | |
2155 | #include "ev++.h" |
2191 | #include "ev++.h" |
2156 | |
2192 | |
2157 | And a F<ev_cpp.C> implementation file that contains libev proper and is compiled: |
2193 | And a F<ev_cpp.C> implementation file that contains libev proper and is compiled: |
2158 | |
2194 | |