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Revision 1.118 by root, Sat Dec 21 16:11:51 2019 UTC vs.
Revision 1.121 by root, Wed Mar 18 12:21:48 2020 UTC

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131.\} 131.\}
132.rm #[ #] #H #V #F C 132.rm #[ #] #H #V #F C
133.\" ======================================================================== 133.\" ========================================================================
134.\" 134.\"
135.IX Title "LIBEV 3" 135.IX Title "LIBEV 3"
136.TH LIBEV 3 "2019-12-21" "libev-4.31" "libev - high performance full featured event loop" 136.TH LIBEV 3 "2020-03-12" "libev-4.31" "libev - high performance full featured event loop"
137.\" For nroff, turn off justification. Always turn off hyphenation; it makes 137.\" For nroff, turn off justification. Always turn off hyphenation; it makes
138.\" way too many mistakes in technical documents. 138.\" way too many mistakes in technical documents.
139.if n .ad l 139.if n .ad l
140.nh 140.nh
141.SH "NAME" 141.SH "NAME"
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1349with a watcher-specific start function (\f(CW\*(C`ev_TYPE_start (loop, watcher 1349with a watcher-specific start function (\f(CW\*(C`ev_TYPE_start (loop, watcher
1350*)\*(C'\fR), and you can stop watching for events at any time by calling the 1350*)\*(C'\fR), and you can stop watching for events at any time by calling the
1351corresponding stop function (\f(CW\*(C`ev_TYPE_stop (loop, watcher *)\*(C'\fR. 1351corresponding stop function (\f(CW\*(C`ev_TYPE_stop (loop, watcher *)\*(C'\fR.
1352.PP 1352.PP
1353As long as your watcher is active (has been started but not stopped) you 1353As long as your watcher is active (has been started but not stopped) you
1354must not touch the values stored in it. Most specifically you must never 1354must not touch the values stored in it except when explicitly documented
1355reinitialise it or call its \f(CW\*(C`ev_TYPE_set\*(C'\fR macro. 1355otherwise. Most specifically you must never reinitialise it or call its
1356\&\f(CW\*(C`ev_TYPE_set\*(C'\fR macro.
1356.PP 1357.PP
1357Each and every callback receives the event loop pointer as first, the 1358Each and every callback receives the event loop pointer as first, the
1358registered watcher structure as second, and a bitset of received events as 1359registered watcher structure as second, and a bitset of received events as
1359third argument. 1360third argument.
1360.PP 1361.PP
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1767.IX Header "WATCHER TYPES" 1768.IX Header "WATCHER TYPES"
1768This section describes each watcher in detail, but will not repeat 1769This section describes each watcher in detail, but will not repeat
1769information given in the last section. Any initialisation/set macros, 1770information given in the last section. Any initialisation/set macros,
1770functions and members specific to the watcher type are explained. 1771functions and members specific to the watcher type are explained.
1771.PP 1772.PP
1772Members are additionally marked with either \fI[read\-only]\fR, meaning that, 1773Most members are additionally marked with either \fI[read\-only]\fR, meaning
1773while the watcher is active, you can look at the member and expect some 1774that, while the watcher is active, you can look at the member and expect
1774sensible content, but you must not modify it (you can modify it while the 1775some sensible content, but you must not modify it (you can modify it while
1775watcher is stopped to your hearts content), or \fI[read\-write]\fR, which 1776the watcher is stopped to your hearts content), or \fI[read\-write]\fR, which
1776means you can expect it to have some sensible content while the watcher 1777means you can expect it to have some sensible content while the watcher is
1777is active, but you can also modify it. Modifying it may not do something 1778active, but you can also modify it (within the same thread as the event
1779loop, i.e. without creating data races). Modifying it may not do something
1778sensible or take immediate effect (or do anything at all), but libev will 1780sensible or take immediate effect (or do anything at all), but libev will
1779not crash or malfunction in any way. 1781not crash or malfunction in any way.
1782.PP
1783In any case, the documentation for each member will explain what the
1784effects are, and if there are any additional access restrictions.
1780.ie n .SS """ev_io"" \- is this file descriptor readable or writable?" 1785.ie n .SS """ev_io"" \- is this file descriptor readable or writable?"
1781.el .SS "\f(CWev_io\fP \- is this file descriptor readable or writable?" 1786.el .SS "\f(CWev_io\fP \- is this file descriptor readable or writable?"
1782.IX Subsection "ev_io - is this file descriptor readable or writable?" 1787.IX Subsection "ev_io - is this file descriptor readable or writable?"
1783I/O watchers check whether a file descriptor is readable or writable 1788I/O watchers check whether a file descriptor is readable or writable
1784in each iteration of the event loop, or, more precisely, when reading 1789in each iteration of the event loop, or, more precisely, when reading
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1950.PD 0 1955.PD 0
1951.IP "ev_io_set (ev_io *, int fd, int events)" 4 1956.IP "ev_io_set (ev_io *, int fd, int events)" 4
1952.IX Item "ev_io_set (ev_io *, int fd, int events)" 1957.IX Item "ev_io_set (ev_io *, int fd, int events)"
1953.PD 1958.PD
1954Configures an \f(CW\*(C`ev_io\*(C'\fR watcher. The \f(CW\*(C`fd\*(C'\fR is the file descriptor to 1959Configures an \f(CW\*(C`ev_io\*(C'\fR watcher. The \f(CW\*(C`fd\*(C'\fR is the file descriptor to
1955receive events for and \f(CW\*(C`events\*(C'\fR is either \f(CW\*(C`EV_READ\*(C'\fR, \f(CW\*(C`EV_WRITE\*(C'\fR or 1960receive events for and \f(CW\*(C`events\*(C'\fR is either \f(CW\*(C`EV_READ\*(C'\fR, \f(CW\*(C`EV_WRITE\*(C'\fR, both
1956\&\f(CW\*(C`EV_READ | EV_WRITE\*(C'\fR, to express the desire to receive the given events. 1961\&\f(CW\*(C`EV_READ | EV_WRITE\*(C'\fR or \f(CW0\fR, to express the desire to receive the given
1962events.
1963.Sp
1964Note that setting the \f(CW\*(C`events\*(C'\fR to \f(CW0\fR and starting the watcher is
1965supported, but not specially optimized \- if your program sometimes happens
1966to generate this combination this is fine, but if it is easy to avoid
1967starting an io watcher watching for no events you should do so.
1968.IP "ev_io_modify (ev_io *, int events)" 4
1969.IX Item "ev_io_modify (ev_io *, int events)"
1970Similar to \f(CW\*(C`ev_io_set\*(C'\fR, but only changes the requested events. Using this
1971might be faster with some backends, as libev can assume that the \f(CW\*(C`fd\*(C'\fR
1972still refers to the same underlying file description, something it cannot
1973do when using \f(CW\*(C`ev_io_set\*(C'\fR.
1957.IP "int fd [read\-only]" 4 1974.IP "int fd [no\-modify]" 4
1958.IX Item "int fd [read-only]" 1975.IX Item "int fd [no-modify]"
1959The file descriptor being watched. 1976The file descriptor being watched. While it can be read at any time, you
1977must not modify this member even when the watcher is stopped \- always use
1978\&\f(CW\*(C`ev_io_set\*(C'\fR for that.
1960.IP "int events [read\-only]" 4 1979.IP "int events [no\-modify]" 4
1961.IX Item "int events [read-only]" 1980.IX Item "int events [no-modify]"
1962The events being watched. 1981The set of events the fd is being watched for, among other flags. Remember
1982that this is a bit set \- to test for \f(CW\*(C`EV_READ\*(C'\fR, use \f(CW\*(C`w\->events &
1983EV_READ\*(C'\fR, and similarly for \f(CW\*(C`EV_WRITE\*(C'\fR.
1984.Sp
1985As with \f(CW\*(C`fd\*(C'\fR, you must not modify this member even when the watcher is
1986stopped, always use \f(CW\*(C`ev_io_set\*(C'\fR or \f(CW\*(C`ev_io_modify\*(C'\fR for that.
1963.PP 1987.PP
1964\fIExamples\fR 1988\fIExamples\fR
1965.IX Subsection "Examples" 1989.IX Subsection "Examples"
1966.PP 1990.PP
1967Example: Call \f(CW\*(C`stdin_readable_cb\*(C'\fR when \s-1STDIN_FILENO\s0 has become, well 1991Example: Call \f(CW\*(C`stdin_readable_cb\*(C'\fR when \s-1STDIN_FILENO\s0 has become, well
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4395gets automatically stopped and restarted when reconfiguring it with this 4419gets automatically stopped and restarted when reconfiguring it with this
4396method. 4420method.
4397.Sp 4421.Sp
4398For \f(CW\*(C`ev::embed\*(C'\fR watchers this method is called \f(CW\*(C`set_embed\*(C'\fR, to avoid 4422For \f(CW\*(C`ev::embed\*(C'\fR watchers this method is called \f(CW\*(C`set_embed\*(C'\fR, to avoid
4399clashing with the \f(CW\*(C`set (loop)\*(C'\fR method. 4423clashing with the \f(CW\*(C`set (loop)\*(C'\fR method.
4424.Sp
4425For \f(CW\*(C`ev::io\*(C'\fR watchers there is an additional \f(CW\*(C`set\*(C'\fR method that acepts a
4426new event mask only, and internally calls \f(CW\*(C`ev_io_modfify\*(C'\fR.
4400.IP "w\->start ()" 4 4427.IP "w\->start ()" 4
4401.IX Item "w->start ()" 4428.IX Item "w->start ()"
4402Starts the watcher. Note that there is no \f(CW\*(C`loop\*(C'\fR argument, as the 4429Starts the watcher. Note that there is no \f(CW\*(C`loop\*(C'\fR argument, as the
4403constructor already stores the event loop. 4430constructor already stores the event loop.
4404.IP "w\->start ([arguments])" 4 4431.IP "w\->start ([arguments])" 4

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