… | |
… | |
265 | or setgid) then libev will I<not> look at the environment variable |
265 | or setgid) then libev will I<not> look at the environment variable |
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. |
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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 | |
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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. |
270 | |
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, |
… | |
… | |
1437 | |
1457 | |
1438 | // create io watchers for each fd and a timer before blocking |
1458 | // create io watchers for each fd and a timer before blocking |
1439 | static void |
1459 | static void |
1440 | adns_prepare_cb (ev_loop *loop, ev_prepare *w, int revents) |
1460 | adns_prepare_cb (ev_loop *loop, ev_prepare *w, int revents) |
1441 | { |
1461 | { |
1442 | int timeout = 3600000;truct pollfd fds [nfd]; |
1462 | int timeout = 3600000; |
|
|
1463 | struct pollfd fds [nfd]; |
1443 | // actual code will need to loop here and realloc etc. |
1464 | // actual code will need to loop here and realloc etc. |
1444 | adns_beforepoll (ads, fds, &nfd, &timeout, timeval_from (ev_time ())); |
1465 | adns_beforepoll (ads, fds, &nfd, &timeout, timeval_from (ev_time ())); |
1445 | |
1466 | |
1446 | /* the callback is illegal, but won't be called as we stop during check */ |
1467 | /* the callback is illegal, but won't be called as we stop during check */ |
1447 | ev_timer_init (&tw, 0, timeout * 1e-3); |
1468 | ev_timer_init (&tw, 0, timeout * 1e-3); |
… | |
… | |
1828 | Similar to the other two macros, this gives you the value of the default |
1849 | Similar to the other two macros, this gives you the value of the default |
1829 | loop, if multiple loops are supported ("ev loop default"). |
1850 | loop, if multiple loops are supported ("ev loop default"). |
1830 | |
1851 | |
1831 | =back |
1852 | =back |
1832 | |
1853 | |
1833 | Example: Declare and initialise a check watcher, working regardless of |
1854 | Example: Declare and initialise a check watcher, utilising the above |
1834 | wether multiple loops are supported or not. |
1855 | macros so it will work regardless of wether multiple loops are supported |
|
|
1856 | or not. |
1835 | |
1857 | |
1836 | static void |
1858 | static void |
1837 | check_cb (EV_P_ ev_timer *w, int revents) |
1859 | check_cb (EV_P_ ev_timer *w, int revents) |
1838 | { |
1860 | { |
1839 | ev_check_stop (EV_A_ w); |
1861 | ev_check_stop (EV_A_ w); |
… | |
… | |
1841 | |
1863 | |
1842 | ev_check check; |
1864 | ev_check check; |
1843 | ev_check_init (&check, check_cb); |
1865 | ev_check_init (&check, check_cb); |
1844 | ev_check_start (EV_DEFAULT_ &check); |
1866 | ev_check_start (EV_DEFAULT_ &check); |
1845 | ev_loop (EV_DEFAULT_ 0); |
1867 | ev_loop (EV_DEFAULT_ 0); |
1846 | |
|
|
1847 | |
1868 | |
1848 | =head1 EMBEDDING |
1869 | =head1 EMBEDDING |
1849 | |
1870 | |
1850 | Libev can (and often is) directly embedded into host |
1871 | Libev can (and often is) directly embedded into host |
1851 | applications. Examples of applications that embed it include the Deliantra |
1872 | applications. Examples of applications that embed it include the Deliantra |
… | |
… | |
1891 | ev_vars.h |
1912 | ev_vars.h |
1892 | ev_wrap.h |
1913 | ev_wrap.h |
1893 | |
1914 | |
1894 | ev_win32.c required on win32 platforms only |
1915 | ev_win32.c required on win32 platforms only |
1895 | |
1916 | |
1896 | ev_select.c only when select backend is enabled (which is by default) |
1917 | 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) |
1918 | 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) |
1919 | 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) |
1920 | 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) |
1921 | ev_port.c only when the solaris port backend is enabled (disabled by default) |
1901 | |
1922 | |
… | |
… | |
2143 | interface) and F<EV.xs> (implementation) files. Only the F<EV.xs> file |
2164 | 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 |
2165 | will be compiled. It is pretty complex because it provides its own header |
2145 | file. |
2166 | file. |
2146 | |
2167 | |
2147 | The usage in rxvt-unicode is simpler. It has a F<ev_cpp.h> header file |
2168 | 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: |
2169 | that everybody includes and which overrides some configure choices: |
2149 | |
2170 | |
|
|
2171 | #define EV_MINIMAL 1 |
2150 | #define EV_USE_POLL 0 |
2172 | #define EV_USE_POLL 0 |
2151 | #define EV_MULTIPLICITY 0 |
2173 | #define EV_MULTIPLICITY 0 |
2152 | #define EV_PERIODICS 0 |
2174 | #define EV_PERIODIC_ENABLE 0 |
|
|
2175 | #define EV_STAT_ENABLE 0 |
|
|
2176 | #define EV_FORK_ENABLE 0 |
2153 | #define EV_CONFIG_H <config.h> |
2177 | #define EV_CONFIG_H <config.h> |
|
|
2178 | #define EV_MINPRI 0 |
|
|
2179 | #define EV_MAXPRI 0 |
2154 | |
2180 | |
2155 | #include "ev++.h" |
2181 | #include "ev++.h" |
2156 | |
2182 | |
2157 | And a F<ev_cpp.C> implementation file that contains libev proper and is compiled: |
2183 | And a F<ev_cpp.C> implementation file that contains libev proper and is compiled: |
2158 | |
2184 | |