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Comparing libev/ev.3 (file contents):
Revision 1.104 by root, Sun Dec 20 01:35:55 2015 UTC vs.
Revision 1.107 by root, Wed Jun 21 14:42:30 2017 UTC

1.\" Automatically generated by Pod::Man 2.28 (Pod::Simple 3.30) 1.\" Automatically generated by Pod::Man 2.28 (Pod::Simple 3.29)
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3.\" Standard preamble: 3.\" Standard preamble:
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5.de Sp \" Vertical space (when we can't use .PP) 5.de Sp \" Vertical space (when we can't use .PP)
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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 "2015-12-20" "libev-4.20" "libev - high performance full featured event loop" 136.TH LIBEV 3 "2017-06-21" "libev-4.24" "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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2346Periodic watchers are also timers of a kind, but they are very versatile 2346Periodic watchers are also timers of a kind, but they are very versatile
2347(and unfortunately a bit complex). 2347(and unfortunately a bit complex).
2348.PP 2348.PP
2349Unlike \f(CW\*(C`ev_timer\*(C'\fR, periodic watchers are not based on real time (or 2349Unlike \f(CW\*(C`ev_timer\*(C'\fR, periodic watchers are not based on real time (or
2350relative time, the physical time that passes) but on wall clock time 2350relative time, the physical time that passes) but on wall clock time
2351(absolute time, the thing you can read on your calender or clock). The 2351(absolute time, the thing you can read on your calendar or clock). The
2352difference is that wall clock time can run faster or slower than real 2352difference is that wall clock time can run faster or slower than real
2353time, and time jumps are not uncommon (e.g. when you adjust your 2353time, and time jumps are not uncommon (e.g. when you adjust your
2354wrist-watch). 2354wrist-watch).
2355.PP 2355.PP
2356You can tell a periodic watcher to trigger after some specific point 2356You can tell a periodic watcher to trigger after some specific point
… …
4521\& ev_vars.h 4521\& ev_vars.h
4522\& ev_wrap.h 4522\& ev_wrap.h
4523\& 4523\&
4524\& ev_win32.c required on win32 platforms only 4524\& ev_win32.c required on win32 platforms only
4525\& 4525\&
4526\& ev_select.c only when select backend is enabled (which is enabled by default) 4526\& ev_select.c only when select backend is enabled
4527\& ev_poll.c only when poll backend is enabled (disabled by default) 4527\& ev_poll.c only when poll backend is enabled
4528\& ev_epoll.c only when the epoll backend is enabled (disabled by default) 4528\& ev_epoll.c only when the epoll backend is enabled
4529\& ev_kqueue.c only when the kqueue backend is enabled (disabled by default) 4529\& ev_kqueue.c only when the kqueue backend is enabled
4530\& ev_port.c only when the solaris port backend is enabled (disabled by default) 4530\& ev_port.c only when the solaris port backend is enabled
4531.Ve 4531.Ve
4532.PP 4532.PP
4533\&\fIev.c\fR includes the backend files directly when enabled, so you only need 4533\&\fIev.c\fR includes the backend files directly when enabled, so you only need
4534to compile this single file. 4534to compile this single file.
4535.PP 4535.PP
… …
5412Libev assumes not only that all watcher pointers have the same internal 5412Libev assumes not only that all watcher pointers have the same internal
5413structure (guaranteed by \s-1POSIX\s0 but not by \s-1ISO C\s0 for example), but it also 5413structure (guaranteed by \s-1POSIX\s0 but not by \s-1ISO C\s0 for example), but it also
5414assumes that the same (machine) code can be used to call any watcher 5414assumes that the same (machine) code can be used to call any watcher
5415callback: The watcher callbacks have different type signatures, but libev 5415callback: The watcher callbacks have different type signatures, but libev
5416calls them using an \f(CW\*(C`ev_watcher *\*(C'\fR internally. 5416calls them using an \f(CW\*(C`ev_watcher *\*(C'\fR internally.
5417.IP "null pointers and integer zero are represented by 0 bytes" 4
5418.IX Item "null pointers and integer zero are represented by 0 bytes"
5419Libev uses \f(CW\*(C`memset\*(C'\fR to initialise structs and arrays to \f(CW0\fR bytes, and
5420relies on this setting pointers and integers to null.
5417.IP "pointer accesses must be thread-atomic" 4 5421.IP "pointer accesses must be thread-atomic" 4
5418.IX Item "pointer accesses must be thread-atomic" 5422.IX Item "pointer accesses must be thread-atomic"
5419Accessing a pointer value must be atomic, it must both be readable and 5423Accessing a pointer value must be atomic, it must both be readable and
5420writable in one piece \- this is the case on all current architectures. 5424writable in one piece \- this is the case on all current architectures.
5421.ie n .IP """sig_atomic_t volatile"" must be thread-atomic as well" 4 5425.ie n .IP """sig_atomic_t volatile"" must be thread-atomic as well" 4

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