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Comparing libev/ev.pod (file contents):
Revision 1.461 by root, Wed Jan 22 12:15:52 2020 UTC vs.
Revision 1.464 by root, Sun Jan 26 06:04:20 2020 UTC

… …
1653 1653
1654Most members are additionally marked with either I<[read-only]>, meaning 1654Most members are additionally marked with either I<[read-only]>, meaning
1655that, while the watcher is active, you can look at the member and expect 1655that, while the watcher is active, you can look at the member and expect
1656some sensible content, but you must not modify it (you can modify it while 1656some sensible content, but you must not modify it (you can modify it while
1657the watcher is stopped to your hearts content), or I<[read-write]>, which 1657the watcher is stopped to your hearts content), or I<[read-write]>, which
1658means you can expect it to have some sensible content while the watcher 1658means you can expect it to have some sensible content while the watcher is
1659is active, but you can also modify it. Modifying it may not do something 1659active, but you can also modify it (within the same thread as the event
1660loop, i.e. without creating data races). Modifying it may not do something
1660sensible or take immediate effect (or do anything at all), but libev will 1661sensible or take immediate effect (or do anything at all), but libev will
1661not crash or malfunction in any way. 1662not crash or malfunction in any way.
1662 1663
1663In any case, the documentation for each member will explain what the 1664In any case, the documentation for each member will explain what the
1664effects are, and if there are any additional access restrictions. 1665effects are, and if there are any additional access restrictions.
… …
1829=item ev_io_init (ev_io *, callback, int fd, int events) 1830=item ev_io_init (ev_io *, callback, int fd, int events)
1830 1831
1831=item ev_io_set (ev_io *, int fd, int events) 1832=item ev_io_set (ev_io *, int fd, int events)
1832 1833
1833Configures an C<ev_io> watcher. The C<fd> is the file descriptor to 1834Configures an C<ev_io> watcher. The C<fd> is the file descriptor to
1834receive events for and C<events> is either C<EV_READ>, C<EV_WRITE> or 1835receive events for and C<events> is either C<EV_READ>, C<EV_WRITE>, both
1835C<EV_READ | EV_WRITE>, to express the desire to receive the given events. 1836C<EV_READ | EV_WRITE> or C<0>, to express the desire to receive the given
1837events.
1838
1839Note that setting the C<events> to C<0> and starting the watcher is
1840supported, but not specially optimized - if your program sometimes happens
1841to generate this combination this is fine, but if it is easy to avoid
1842starting an io watcher watching for no events you should do so.
1836 1843
1837=item ev_io_modify (ev_io *, int events) 1844=item ev_io_modify (ev_io *, int events)
1838 1845
1839Similar to C<ev_io_set>, but only changes the event mask. Using this might 1846Similar to C<ev_io_set>, but only changes the requested events. Using this
1840be faster with some backends, as libev can assume that the C<fd> still 1847might be faster with some backends, as libev can assume that the C<fd>
1841refers to the same underlying file description, something it cannot do 1848still refers to the same underlying file description, something it cannot
1842when using C<ev_io_set>. 1849do when using C<ev_io_set>.
1843 1850
1844=item int fd [no-modify] 1851=item int fd [no-modify]
1845 1852
1846The file descriptor being watched. While it can be read at any time, you 1853The file descriptor being watched. While it can be read at any time, you
1847must not modify this member even when the watcher is stopped - always use 1854must not modify this member even when the watcher is stopped - always use

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