[ViewVC] Diff of: cvs/IO-AIO/README

Comparing IO-AIO/README (file contents):
Revision 1.41 by root, Sat Jan 2 14:24:32 2010 UTC vs.
Revision 1.43 by root, Sun Jan 10 23:44:02 2010 UTC

…		…
23	my $req = aio_unlink "/tmp/file", sub { };	23	my $req = aio_unlink "/tmp/file", sub { };
24	$req->cancel; # cancel request if still in queue	24	$req->cancel; # cancel request if still in queue
25		25
26	my $grp = aio_group sub { print "all stats done\n" };	26	my $grp = aio_group sub { print "all stats done\n" };
27	add $grp aio_stat "..." for ...;	27	add $grp aio_stat "..." for ...;
28
29	# AnyEvent integration (EV, Event, Glib, Tk, POE, urxvt, pureperl...)
30	use AnyEvent::AIO;
31
32	# EV integration
33	my $aio_w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb;
34
35	# Event integration
36	Event->io (fd => IO::AIO::poll_fileno,
37	poll => 'r',
38	cb => \&IO::AIO::poll_cb);
39
40	# Glib/Gtk2 integration
41	add_watch Glib::IO IO::AIO::poll_fileno,
42	in => sub { IO::AIO::poll_cb; 1 };
43
44	# Tk integration
45	Tk::Event::IO->fileevent (IO::AIO::poll_fileno, "",
46	readable => \&IO::AIO::poll_cb);
47
48	# Danga::Socket integration
49	Danga::Socket->AddOtherFds (IO::AIO::poll_fileno =>
50	\&IO::AIO::poll_cb);
51		28
52	DESCRIPTION	29	DESCRIPTION
53	This module implements asynchronous I/O using whatever means your	30	This module implements asynchronous I/O using whatever means your
54	operating system supports. It is implemented as an interface to "libeio"	31	operating system supports. It is implemented as an interface to "libeio"
55	(<http://software.schmorp.de/pkg/libeio.html>).	32	(<http://software.schmorp.de/pkg/libeio.html>).
…		…
168	anymore (except possibly for the Perl object, but its connection to	145	anymore (except possibly for the Perl object, but its connection to
169	the actual aio request is severed and calling its methods will	146	the actual aio request is severed and calling its methods will
170	either do nothing or result in a runtime error).	147	either do nothing or result in a runtime error).
171		148
172	FUNCTIONS	149	FUNCTIONS
		150	QUICK OVERVIEW
		151	This section simply lists the prototypes of the most important functions
		152	for quick reference. See the following sections for function-by-function
		153	documentation.
		154
		155	aio_open $pathname, $flags, $mode, $callback->($fh)
		156	aio_close $fh, $callback->($status)
		157	aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
		158	aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
		159	aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval)
		160	aio_readahead $fh,$offset,$length, $callback->($retval)
		161	aio_stat $fh_or_path, $callback->($status)
		162	aio_lstat $fh, $callback->($status)
		163	aio_statvfs $fh_or_path, $callback->($statvfs)
		164	aio_utime $fh_or_path, $atime, $mtime, $callback->($status)
		165	aio_chown $fh_or_path, $uid, $gid, $callback->($status)
		166	aio_truncate $fh_or_path, $offset, $callback->($status)
		167	aio_chmod $fh_or_path, $mode, $callback->($status)
		168	aio_unlink $pathname, $callback->($status)
		169	aio_mknod $path, $mode, $dev, $callback->($status)
		170	aio_link $srcpath, $dstpath, $callback->($status)
		171	aio_symlink $srcpath, $dstpath, $callback->($status)
		172	aio_readlink $path, $callback->($link)
		173	aio_rename $srcpath, $dstpath, $callback->($status)
		174	aio_mkdir $pathname, $mode, $callback->($status)
		175	aio_rmdir $pathname, $callback->($status)
		176	aio_readdir $pathname, $callback->($entries)
		177	aio_readdirx $pathname, $flags, $callback->($entries, $flags)
		178	IO::AIO::READDIR_DENTS IO::AIO::READDIR_DIRS_FIRST
		179	IO::AIO::READDIR_STAT_ORDER IO::AIO::READDIR_FOUND_UNKNOWN
		180	aio_load $path, $data, $callback->($status)
		181	aio_copy $srcpath, $dstpath, $callback->($status)
		182	aio_move $srcpath, $dstpath, $callback->($status)
		183	aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
		184	aio_rmtree $path, $callback->($status)
		185	aio_sync $callback->($status)
		186	aio_fsync $fh, $callback->($status)
		187	aio_fdatasync $fh, $callback->($status)
		188	aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status)
		189	aio_pathsync $path, $callback->($status)
		190	aio_msync $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status)
		191	aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status)
		192	aio_group $callback->(...)
		193	aio_nop $callback->()
		194
		195	$prev_pri = aioreq_pri [$pri]
		196	aioreq_nice $pri_adjust
		197
		198	IO::AIO::poll_wait
		199	IO::AIO::poll_cb
		200	IO::AIO::poll
		201	IO::AIO::flush
		202	IO::AIO::max_poll_reqs $nreqs
		203	IO::AIO::max_poll_time $seconds
		204	IO::AIO::min_parallel $nthreads
		205	IO::AIO::max_parallel $nthreads
		206	IO::AIO::max_idle $nthreads
		207	IO::AIO::max_outstanding $maxreqs
		208	IO::AIO::nreqs
		209	IO::AIO::nready
		210	IO::AIO::npending
		211
		212	IO::AIO::sendfile $ofh, $ifh, $offset, $count
		213	IO::AIO::fadvise $fh, $offset, $len, $advice
		214	IO::AIO::mlockall $flags
		215	IO::AIO::munlockall
		216
173	AIO REQUEST FUNCTIONS	217	AIO REQUEST FUNCTIONS
174	All the "aio_*" calls are more or less thin wrappers around the syscall	218	All the "aio_*" calls are more or less thin wrappers around the syscall
175	with the same name (sans "aio_"). The arguments are similar or	219	with the same name (sans "aio_"). The arguments are similar or
176	identical, and they all accept an additional (and optional) $callback	220	identical, and they all accept an additional (and optional) $callback
177	argument which must be a code reference. This code reference will get	221	argument which must be a code reference. This code reference will get
…		…
313	more than one "aio_sendfile" per $out_fh, as they will interfere	357	more than one "aio_sendfile" per $out_fh, as they will interfere
314	with each other.	358	with each other.
315		359
316	This call tries to make use of a native "sendfile" syscall to	360	This call tries to make use of a native "sendfile" syscall to
317	provide zero-copy operation. For this to work, $out_fh should refer	361	provide zero-copy operation. For this to work, $out_fh should refer
318	to a socket, and $in_fh should refer to mmap'able file.	362	to a socket, and $in_fh should refer to an mmap'able file.
319		363
320	If a native sendfile cannot be found or it fails with "ENOSYS",	364	If a native sendfile cannot be found or it fails with "ENOSYS",
321	"ENOTSUP", "EOPNOTSUPP", "EAFNOSUPPORT", "EPROTOTYPE" or "ENOTSOCK",	365	"ENOTSUP", "EOPNOTSUPP", "EAFNOSUPPORT", "EPROTOTYPE" or "ENOTSOCK",
322	it will be emulated, so you can call "aio_sendfile" on any type of	366	it will be emulated, so you can call "aio_sendfile" on any type of
323	filehandle regardless of the limitations of the operating system.	367	filehandle regardless of the limitations of the operating system.
…		…
363	aio_stat "/etc/passwd", sub {	407	aio_stat "/etc/passwd", sub {
364	$_[0] and die "stat failed: $!";	408	$_[0] and die "stat failed: $!";
365	print "size is ", -s _, "\n";	409	print "size is ", -s _, "\n";
366	};	410	};
367		411
		412	aio_statvfs $fh_or_path, $callback->($statvfs)
		413	Works like the POSIX "statvfs" or "fstatvfs" syscalls, depending on
		414	whether a file handle or path was passed.
		415
		416	On success, the callback is passed a hash reference with the
		417	following members: "bsize", "frsize", "blocks", "bfree", "bavail",
		418	"files", "ffree", "favail", "fsid", "flag" and "namemax". On
		419	failure, "undef" is passed.
		420
		421	The following POSIX IO::AIO::ST_* constants are defined: "ST_RDONLY"
		422	and "ST_NOSUID".
		423
		424	The following non-POSIX IO::AIO::ST_* flag masks are defined to
		425	their correct value when available, or to 0 on systems that do not
		426	support them: "ST_NODEV", "ST_NOEXEC", "ST_SYNCHRONOUS",
		427	"ST_MANDLOCK", "ST_WRITE", "ST_APPEND", "ST_IMMUTABLE",
		428	"ST_NOATIME", "ST_NODIRATIME" and "ST_RELATIME".
		429
		430	Example: stat "/wd" and dump out the data if successful.
		431
		432	aio_statvfs "/wd", sub {
		433	my $f = $_[0]
		434	or die "statvfs: $!";
		435
		436	use Data::Dumper;
		437	say Dumper $f;
		438	};
		439
		440	# result:
		441	{
		442	bsize => 1024,
		443	bfree => 4333064312,
		444	blocks => 10253828096,
		445	files => 2050765568,
		446	flag => 4096,
		447	favail => 2042092649,
		448	bavail => 4333064312,
		449	ffree => 2042092649,
		450	namemax => 255,
		451	frsize => 1024,
		452	fsid => 1810
		453	}
		454
368	aio_utime $fh_or_path, $atime, $mtime, $callback->($status)	455	aio_utime $fh_or_path, $atime, $mtime, $callback->($status)
369	Works like perl's "utime" function (including the special case of	456	Works like perl's "utime" function (including the special case of
370	$atime and $mtime being undef). Fractional times are supported if	457	$atime and $mtime being undef). Fractional times are supported if
371	the underlying syscalls support them.	458	the underlying syscalls support them.
372		459
…		…
640	Passes 0 when everything went ok, and -1 on error.	727	Passes 0 when everything went ok, and -1 on error.
641		728
642	aio_msync $scalar, $offset = 0, $length = undef, flags = 0,	729	aio_msync $scalar, $offset = 0, $length = undef, flags = 0,
643	$callback->($status)	730	$callback->($status)
644	This is a rather advanced IO::AIO call, which only works on	731	This is a rather advanced IO::AIO call, which only works on
645	mmap(2)ed scalars (see the Sys::Mmap or Mmap modules for details on	732	mmap(2)ed scalars (see the "IO::AIO::mmap" function, although it
		733	also works on data scalars managed by the Sys::Mmap or Mmap modules,
646	this, note that the scalar must only be modified in-place while an	734	note that the scalar must only be modified in-place while an aio
647	aio operation is pending on it).	735	operation is pending on it).
648		736
649	It calls the "msync" function of your OS, if available, with the	737	It calls the "msync" function of your OS, if available, with the
650	memory area starting at $offset in the string and ending $length	738	memory area starting at $offset in the string and ending $length
651	bytes later. If $length is negative, counts from the end, and if	739	bytes later. If $length is negative, counts from the end, and if
652	$length is "undef", then it goes till the end of the string. The	740	$length is "undef", then it goes till the end of the string. The
…		…
885		973
886	Event->io (fd => IO::AIO::poll_fileno,	974	Event->io (fd => IO::AIO::poll_fileno,
887	poll => 'r', async => 1,	975	poll => 'r', async => 1,
888	cb => \&IO::AIO::poll_cb);	976	cb => \&IO::AIO::poll_cb);
889		977
		978	IO::AIO::poll_wait
		979	If there are any outstanding requests and none of them in the result
		980	phase, wait till the result filehandle becomes ready for reading
		981	(simply does a "select" on the filehandle. This is useful if you
		982	want to synchronously wait for some requests to finish).
		983
		984	See "nreqs" for an example.
		985
		986	IO::AIO::poll
		987	Waits until some requests have been handled.
		988
		989	Returns the number of requests processed, but is otherwise strictly
		990	equivalent to:
		991
		992	IO::AIO::poll_wait, IO::AIO::poll_cb
		993
		994	IO::AIO::flush
		995	Wait till all outstanding AIO requests have been handled.
		996
		997	Strictly equivalent to:
		998
		999	IO::AIO::poll_wait, IO::AIO::poll_cb
		1000	while IO::AIO::nreqs;
		1001
890	IO::AIO::max_poll_reqs $nreqs	1002	IO::AIO::max_poll_reqs $nreqs
891	IO::AIO::max_poll_time $seconds	1003	IO::AIO::max_poll_time $seconds
892	These set the maximum number of requests (default 0, meaning	1004	These set the maximum number of requests (default 0, meaning
893	infinity) that are being processed by "IO::AIO::poll_cb" in one	1005	infinity) that are being processed by "IO::AIO::poll_cb" in one
894	call, respectively the maximum amount of time (default 0, meaning	1006	call, respectively the maximum amount of time (default 0, meaning
…		…
917	# use a low priority so other tasks have priority	1029	# use a low priority so other tasks have priority
918	Event->io (fd => IO::AIO::poll_fileno,	1030	Event->io (fd => IO::AIO::poll_fileno,
919	poll => 'r', nice => 1,	1031	poll => 'r', nice => 1,
920	cb => &IO::AIO::poll_cb);	1032	cb => &IO::AIO::poll_cb);
921		1033
922	IO::AIO::poll_wait
923	If there are any outstanding requests and none of them in the result
924	phase, wait till the result filehandle becomes ready for reading
925	(simply does a "select" on the filehandle. This is useful if you
926	want to synchronously wait for some requests to finish).
927
928	See "nreqs" for an example.
929
930	IO::AIO::poll
931	Waits until some requests have been handled.
932
933	Returns the number of requests processed, but is otherwise strictly
934	equivalent to:
935
936	IO::AIO::poll_wait, IO::AIO::poll_cb
937
938	IO::AIO::flush
939	Wait till all outstanding AIO requests have been handled.
940
941	Strictly equivalent to:
942
943	IO::AIO::poll_wait, IO::AIO::poll_cb
944	while IO::AIO::nreqs;
945
946	CONTROLLING THE NUMBER OF THREADS	1034	CONTROLLING THE NUMBER OF THREADS
947	IO::AIO::min_parallel $nthreads	1035	IO::AIO::min_parallel $nthreads
948	Set the minimum number of AIO threads to $nthreads. The current	1036	Set the minimum number of AIO threads to $nthreads. The current
949	default is 8, which means eight asynchronous operations can execute	1037	default is 8, which means eight asynchronous operations can execute
950	concurrently at any one time (the number of outstanding requests,	1038	concurrently at any one time (the number of outstanding requests,
…		…
1050	"IO::AIO::FADV_RANDOM", "IO::AIO::FADV_NOREUSE",	1138	"IO::AIO::FADV_RANDOM", "IO::AIO::FADV_NOREUSE",
1051	"IO::AIO::FADV_WILLNEED", "IO::AIO::FADV_DONTNEED".	1139	"IO::AIO::FADV_WILLNEED", "IO::AIO::FADV_DONTNEED".
1052		1140
1053	On systems that do not implement "posix_fadvise", this function	1141	On systems that do not implement "posix_fadvise", this function
1054	returns ENOSYS, otherwise the return value of "posix_fadvise".	1142	returns ENOSYS, otherwise the return value of "posix_fadvise".
		1143
		1144	IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset]
		1145	Memory-maps a file (or anonymous memory range) and attaches it to
		1146	the given $scalar, which will act like a string scalar.
		1147
		1148	The only operations allowed on the scalar are "substr"/"vec" that
		1149	don't change the string length, and most read-only operations such
		1150	as copying it or searching it with regexes and so on.
		1151
		1152	Anything else is unsafe and will, at best, result in memory leaks.
		1153
		1154	The memory map associated with the $scalar is automatically removed
		1155	when the $scalar is destroyed, or when the "IO::AIO::mmap" or
		1156	"IO::AIO::munmap" functions are called.
		1157
		1158	This calls the "mmap"(2) function internally. See your system's
		1159	manual page for details on the $length, $prot and $flags parameters.
		1160
		1161	The $length must be larger than zero and smaller than the actual
		1162	filesize.
		1163
		1164	$prot is a combination of "IO::AIO::PROT_NONE",
		1165	"IO::AIO::PROT_EXEC", "IO::AIO::PROT_READ" and/or
		1166	"IO::AIO::PROT_WRITE",
		1167
		1168	$flags can be a combination of "IO::AIO::MAP_SHARED" or
		1169	"IO::AIO::MAP_PRIVATE", or a number of system-specific flags (when
		1170	not available, the are defined as 0): "IO::AIO::MAP_ANONYMOUS"
		1171	(which is set to "MAP_ANON" if your system only provides this
		1172	constant), "IO::AIO::MAP_HUGETLB", "IO::AIO::MAP_LOCKED",
		1173	"IO::AIO::MAP_NORESERVE", "IO::AIO::MAP_POPULATE" or
		1174	"IO::AIO::MAP_NONBLOCK"
		1175
		1176	If $fh is "undef", then a file descriptor of -1 is passed.
		1177
		1178	$offset is the offset from the start of the file - it generally must
		1179	be a multiple of "IO::AIO::PAGESIZE" and defaults to 0.
		1180
		1181	Example:
		1182
		1183	use Digest::MD5;
		1184	use IO::AIO;
		1185
		1186	open my $fh, "<verybigfile"
		1187	or die "$!";
		1188
		1189	IO::AIO::mmap my $data, -s $fh, IO::AIO::PROT_READ, IO::AIO::MAP_SHARED, $fh
		1190	or die "verybigfile: $!";
		1191
		1192	my $fast_md5 = md5 $data;
		1193
		1194	IO::AIO::munmap $scalar
		1195	Removes a previous mmap and undefines the $scalar.
		1196
		1197	IO::AIO::mlockall $flags
		1198	Calls the "mlockall" function with the given $flags (a combination
		1199	of "IO::AIO::MCL_CURRENT" and "IO::AIO::MCL__FUTURE").
		1200
		1201	On systems that do not implement "mlockall", this function returns
		1202	ENOSYS, otherwise the return value of "mlockall".
		1203
		1204	IO::AIO::munlockall
		1205	Calls the "munlockall" function.
		1206
		1207	On systems that do not implement "munlockall", this function returns
		1208	ENOSYS, otherwise the return value of "munlockall".
		1209
		1210	EVENT LOOP INTEGRATION
		1211	It is recommended to use AnyEvent::AIO to integrate IO::AIO
		1212	automatically into many event loops:
		1213
		1214	# AnyEvent integration (EV, Event, Glib, Tk, POE, urxvt, pureperl...)
		1215	use AnyEvent::AIO;
		1216
		1217	You can also integrate IO::AIO manually into many event loops, here are
		1218	some examples of how to do this:
		1219
		1220	# EV integration
		1221	my $aio_w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb;
		1222
		1223	# Event integration
		1224	Event->io (fd => IO::AIO::poll_fileno,
		1225	poll => 'r',
		1226	cb => \&IO::AIO::poll_cb);
		1227
		1228	# Glib/Gtk2 integration
		1229	add_watch Glib::IO IO::AIO::poll_fileno,
		1230	in => sub { IO::AIO::poll_cb; 1 };
		1231
		1232	# Tk integration
		1233	Tk::Event::IO->fileevent (IO::AIO::poll_fileno, "",
		1234	readable => \&IO::AIO::poll_cb);
		1235
		1236	# Danga::Socket integration
		1237	Danga::Socket->AddOtherFds (IO::AIO::poll_fileno =>
		1238	\&IO::AIO::poll_cb);
1055		1239
1056	FORK BEHAVIOUR	1240	FORK BEHAVIOUR
1057	This module should do "the right thing" when the process using it forks:	1241	This module should do "the right thing" when the process using it forks:
1058		1242
1059	Before the fork, IO::AIO enters a quiescent state where no requests can	1243	Before the fork, IO::AIO enters a quiescent state where no requests can

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Comparing IO-AIO/README (file contents): Revision 1.41 by root, Sat Jan 2 14:24:32 2010 UTC vs. Revision 1.43 by root, Sun Jan 10 23:44:02 2010 UTC

Diff Legend

Comparing IO-AIO/README (file contents):
Revision 1.41 by root, Sat Jan 2 14:24:32 2010 UTC vs.
Revision 1.43 by root, Sun Jan 10 23:44:02 2010 UTC