[ViewVC] Diff of: cvs/IO-AIO/AIO.pm

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.280 by root, Mon Feb 19 13:37:13 2018 UTC vs.
Revision 1.289 by root, Sun Aug 12 05:21:35 2018 UTC

…		…
171	use common::sense;	171	use common::sense;
172		172
173	use base 'Exporter';	173	use base 'Exporter';
174		174
175	BEGIN {	175	BEGIN {
176	our $VERSION = 4.4;	176	our $VERSION = 4.5;
177		177
178	our @AIO_REQ = qw(aio_sendfile aio_seek aio_read aio_write aio_open aio_close	178	our @AIO_REQ = qw(aio_sendfile aio_seek aio_read aio_write aio_open aio_close
179	aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir aio_readdirx	179	aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir aio_readdirx
180	aio_scandir aio_symlink aio_readlink aio_realpath aio_fcntl aio_ioctl	180	aio_scandir aio_symlink aio_readlink aio_realpath aio_fcntl aio_ioctl
181	aio_sync aio_fsync aio_syncfs aio_fdatasync aio_sync_file_range	181	aio_sync aio_fsync aio_syncfs aio_fdatasync aio_sync_file_range
…		…
192	our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush	192	our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush
193	min_parallel max_parallel max_idle idle_timeout	193	min_parallel max_parallel max_idle idle_timeout
194	nreqs nready npending nthreads	194	nreqs nready npending nthreads
195	max_poll_time max_poll_reqs	195	max_poll_time max_poll_reqs
196	sendfile fadvise madvise	196	sendfile fadvise madvise
197	mmap munmap munlock munlockall);	197	mmap munmap mremap munlock munlockall);
198		198
199	push @AIO_REQ, qw(aio_busy); # not exported	199	push @AIO_REQ, qw(aio_busy); # not exported
200		200
201	@IO::AIO::GRP::ISA = 'IO::AIO::REQ';	201	@IO::AIO::GRP::ISA = 'IO::AIO::REQ';
202		202
…		…
285		285
286	IO::AIO::sendfile $ofh, $ifh, $offset, $count	286	IO::AIO::sendfile $ofh, $ifh, $offset, $count
287	IO::AIO::fadvise $fh, $offset, $len, $advice	287	IO::AIO::fadvise $fh, $offset, $len, $advice
288	IO::AIO::mmap $scalar, $length, $prot, $flags[, $fh[, $offset]]	288	IO::AIO::mmap $scalar, $length, $prot, $flags[, $fh[, $offset]]
289	IO::AIO::munmap $scalar	289	IO::AIO::munmap $scalar
		290	IO::AIO::mremap $scalar, $new_length, $flags[, $new_address]
290	IO::AIO::madvise $scalar, $offset, $length, $advice	291	IO::AIO::madvise $scalar, $offset, $length, $advice
291	IO::AIO::mprotect $scalar, $offset, $length, $protect	292	IO::AIO::mprotect $scalar, $offset, $length, $protect
292	IO::AIO::munlock $scalar, $offset = 0, $length = undef	293	IO::AIO::munlock $scalar, $offset = 0, $length = undef
293	IO::AIO::munlockall	294	IO::AIO::munlockall
294		295
…		…
404	following POSIX and non-POSIX constants are available (missing ones on	405	following POSIX and non-POSIX constants are available (missing ones on
405	your system are, as usual, C<0>):	406	your system are, as usual, C<0>):
406		407
407	C<O_ASYNC>, C<O_DIRECT>, C<O_NOATIME>, C<O_CLOEXEC>, C<O_NOCTTY>, C<O_NOFOLLOW>,	408	C<O_ASYNC>, C<O_DIRECT>, C<O_NOATIME>, C<O_CLOEXEC>, C<O_NOCTTY>, C<O_NOFOLLOW>,
408	C<O_NONBLOCK>, C<O_EXEC>, C<O_SEARCH>, C<O_DIRECTORY>, C<O_DSYNC>,	409	C<O_NONBLOCK>, C<O_EXEC>, C<O_SEARCH>, C<O_DIRECTORY>, C<O_DSYNC>,
409	C<O_RSYNC>, C<O_SYNC>, C<O_PATH>, C<O_TMPFILE>, and C<O_TTY_INIT>.	410	C<O_RSYNC>, C<O_SYNC>, C<O_PATH>, C<O_TMPFILE>, C<O_TTY_INIT> and C<O_ACCMODE>.
410		411
411		412
412	=item aio_close $fh, $callback->($status)	413	=item aio_close $fh, $callback->($status)
413		414
414	Asynchronously close a file and call the callback with the result	415	Asynchronously close a file and call the callback with the result
…		…
559	behaviour).	560	behaviour).
560		561
561	C<S_IFMT>, C<S_IFIFO>, C<S_IFCHR>, C<S_IFBLK>, C<S_IFLNK>, C<S_IFREG>,	562	C<S_IFMT>, C<S_IFIFO>, C<S_IFCHR>, C<S_IFBLK>, C<S_IFLNK>, C<S_IFREG>,
562	C<S_IFDIR>, C<S_IFWHT>, C<S_IFSOCK>, C<IO::AIO::major $dev_t>,	563	C<S_IFDIR>, C<S_IFWHT>, C<S_IFSOCK>, C<IO::AIO::major $dev_t>,
563	C<IO::AIO::minor $dev_t>, C<IO::AIO::makedev $major, $minor>.	564	C<IO::AIO::minor $dev_t>, C<IO::AIO::makedev $major, $minor>.
		565
		566	To access higher resolution stat timestamps, see L<SUBSECOND STAT TIME
		567	ACCESS>.
564		568
565	Example: Print the length of F</etc/passwd>:	569	Example: Print the length of F</etc/passwd>:
566		570
567	aio_stat "/etc/passwd", sub {	571	aio_stat "/etc/passwd", sub {
568	$_[0] and die "stat failed: $!";	572	$_[0] and die "stat failed: $!";
…		…
789		793
790	=over 4	794	=over 4
791		795
792	=item IO::AIO::READDIR_DENTS	796	=item IO::AIO::READDIR_DENTS
793		797
794	When this flag is off, then the callback gets an arrayref consisting of	798	Normally the callback gets an arrayref consisting of names only (as
795	names only (as with C<aio_readdir>), otherwise it gets an arrayref with	799	with C<aio_readdir>). If this flag is set, then the callback gets an
796	C<[$name, $type, $inode]> arrayrefs, each describing a single directory	800	arrayref with C<[$name, $type, $inode]> arrayrefs, each describing a
797	entry in more detail.	801	single directory entry in more detail:
798		802
799	C<$name> is the name of the entry.	803	C<$name> is the name of the entry.
800		804
801	C<$type> is one of the C<IO::AIO::DT_xxx> constants:	805	C<$type> is one of the C<IO::AIO::DT_xxx> constants:
802		806
803	C<IO::AIO::DT_UNKNOWN>, C<IO::AIO::DT_FIFO>, C<IO::AIO::DT_CHR>, C<IO::AIO::DT_DIR>,	807	C<IO::AIO::DT_UNKNOWN>, C<IO::AIO::DT_FIFO>, C<IO::AIO::DT_CHR>, C<IO::AIO::DT_DIR>,
804	C<IO::AIO::DT_BLK>, C<IO::AIO::DT_REG>, C<IO::AIO::DT_LNK>, C<IO::AIO::DT_SOCK>,	808	C<IO::AIO::DT_BLK>, C<IO::AIO::DT_REG>, C<IO::AIO::DT_LNK>, C<IO::AIO::DT_SOCK>,
805	C<IO::AIO::DT_WHT>.	809	C<IO::AIO::DT_WHT>.
806		810
807	C<IO::AIO::DT_UNKNOWN> means just that: readdir does not know. If you need to	811	C<IO::AIO::DT_UNKNOWN> means just that: readdir does not know. If you need
808	know, you have to run stat yourself. Also, for speed reasons, the C<$type>	812	to know, you have to run stat yourself. Also, for speed/memory reasons,
809	scalars are read-only: you can not modify them.	813	the C<$type> scalars are read-only: you must not modify them.
810		814
811	C<$inode> is the inode number (which might not be exact on systems with 64	815	C<$inode> is the inode number (which might not be exact on systems with 64
812	bit inode numbers and 32 bit perls). This field has unspecified content on	816	bit inode numbers and 32 bit perls). This field has unspecified content on
813	systems that do not deliver the inode information.	817	systems that do not deliver the inode information.
814		818
…		…
825	short names are tried first.	829	short names are tried first.
826		830
827	=item IO::AIO::READDIR_STAT_ORDER	831	=item IO::AIO::READDIR_STAT_ORDER
828		832
829	When this flag is set, then the names will be returned in an order	833	When this flag is set, then the names will be returned in an order
830	suitable for stat()'ing each one. That is, when you plan to stat()	834	suitable for stat()'ing each one. That is, when you plan to stat() most or
831	all files in the given directory, then the returned order will likely	835	all files in the given directory, then the returned order will likely be
832	be fastest.	836	faster.
833		837
834	If both this flag and C<IO::AIO::READDIR_DIRS_FIRST> are specified, then	838	If both this flag and C<IO::AIO::READDIR_DIRS_FIRST> are specified,
835	the likely dirs come first, resulting in a less optimal stat order.	839	then the likely dirs come first, resulting in a less optimal stat order
		840	for stat'ing all entries, but likely a more optimal order for finding
		841	subdirectories.
836		842
837	=item IO::AIO::READDIR_FOUND_UNKNOWN	843	=item IO::AIO::READDIR_FOUND_UNKNOWN
838		844
839	This flag should not be set when calling C<aio_readdirx>. Instead, it	845	This flag should not be set when calling C<aio_readdirx>. Instead, it
840	is being set by C<aio_readdirx>, when any of the C<$type>'s found were	846	is being set by C<aio_readdirx>, when any of the C<$type>'s found were
…		…
2007	Returns the number of requests currently in the pending state (executed,	2013	Returns the number of requests currently in the pending state (executed,
2008	but not yet processed by poll_cb).	2014	but not yet processed by poll_cb).
2009		2015
2010	=back	2016	=back
2011		2017
		2018	=head3 SUBSECOND STAT TIME ACCESS
		2019
		2020	Both C<aio_stat>/C<aio_lstat> and perl's C<stat>/C<lstat> functions can
		2021	generally find access/modification and change times with subsecond time
		2022	accuracy of the system supports it, but perl's built-in functions only
		2023	return the integer part.
		2024
		2025	The following functions return the timestamps of the most recent
		2026	stat with subsecond precision on most systems and work both after
		2027	C<aio_stat>/C<aio_lstat> and perl's C<stat>/C<lstat> calls. Their return
		2028	value is only meaningful after a successful C<stat>/C<lstat> call, or
		2029	during/after a successful C<aio_stat>/C<aio_lstat> callback.
		2030
		2031	This is similar to the L<Time::HiRes> C<stat> functions, but can return
		2032	full resolution without rounding and work with standard perl C<stat>,
		2033	alleviating the need to call the special C<Time::HiRes> functions, which
		2034	do not act like their perl counterparts.
		2035
		2036	On operating systems or file systems where subsecond time resolution is
		2037	not supported or could not be detected, a fractional part of C<0> is
		2038	returned, so it is always safe to call these functions.
		2039
		2040	=over 4
		2041
		2042	=item IO::AIO::stat_atime, IO::AIO::stat_mtime, IO::AIO::stat_ctime
		2043
		2044	Return the access, modication or change time, respectively, including
		2045	fractional part. Due to the limited precision of floating point, the
		2046	accuracy on most platforms is only a bit better than milliseconds for
		2047	times around now - see the I<nsec> function family, below, for full
		2048	accuracy.
		2049
		2050	=item ($atime, $mtime, $ctime, ...) = IO::AIO::stat_xtime
		2051
		2052	Returns access, modification and change time all in one go, and maybe more
		2053	times in the future version.
		2054
		2055	=item IO::AIO::stat_atimensec, IO::AIO::stat_mtimensec, IO::AIO::stat_ctimensec
		2056
		2057	Return the fractional access, modifcation or change time, in nanoseconds,
		2058	as an integer in the range C<0> to C<999999999>.
		2059
		2060	=back
		2061
		2062	Example: print the high resolution modification time of F</etc>, using
		2063	C<stat>, and C<IO::AIO::aio_stat>.
		2064
		2065	if (stat "/etc") {
		2066	printf "stat(/etc) mtime: %f\n", IO::AIO::stat_mtime;
		2067	}
		2068
		2069	IO::AIO::aio_stat "/etc", sub {
		2070	$_[0]
		2071	and return;
		2072
		2073	printf "aio_stat(/etc) mtime: %d.%09d\n", (stat _)[9], IO::AIO::stat_mtimensec;
		2074	};
		2075
		2076	IO::AIO::flush;
		2077
		2078	Output of the awbove on my system, showing reduced and full accuracy:
		2079
		2080	stat(/etc) mtime: 1534043702.020808
		2081	aio_stat(/etc) mtime: 1534043702.020807792
		2082
2012	=head3 MISCELLANEOUS FUNCTIONS	2083	=head3 MISCELLANEOUS FUNCTIONS
2013		2084
2014	IO::AIO implements some functions that are useful when you want to use	2085	IO::AIO implements some functions that are useful when you want to use
2015	some "Advanced I/O" function not available to in Perl, without going the	2086	some "Advanced I/O" function not available to in Perl, without going the
2016	"Asynchronous I/O" route. Many of these have an asynchronous C<aio_*>	2087	"Asynchronous I/O" route. Many of these have an asynchronous C<aio_*>
…		…
2156		2227
2157	=item IO::AIO::munmap $scalar	2228	=item IO::AIO::munmap $scalar
2158		2229
2159	Removes a previous mmap and undefines the C<$scalar>.	2230	Removes a previous mmap and undefines the C<$scalar>.
2160		2231
		2232	=item IO::AIO::mremap $scalar, $new_length, $flags = MREMAP_MAYMOVE[, $new_address = 0]
		2233
		2234	Calls the Linux-specific mremap(2) system call. The C<$scalar> must have
		2235	been mapped by C<IO::AIO::mmap>, and C<$flags> must currently either be
		2236	C<0> or C<IO::AIO::MREMAP_MAYMOVE>.
		2237
		2238	Returns true if successful, and false otherwise. If the underlying mmapped
		2239	region has changed address, then the true value has the numerical value
		2240	C<1>, otherwise it has the numerical value C<0>:
		2241
		2242	my $success = IO::AIO::mremap $mmapped, 8192, IO::AIO::MREMAP_MAYMOVE
		2243	or die "mremap: $!";
		2244
		2245	if ($success*1) {
		2246	warn "scalar has chanegd address in memory\n";
		2247	}
		2248
		2249	C<IO::AIO::MREMAP_FIXED> and the C<$new_address> argument are currently
		2250	implemented, but not supported and might go away in a future version.
		2251
		2252	On systems where this call is not supported or is not emulated, this call
		2253	returns falls and sets C<$!> to C<ENOSYS>.
		2254
2161	=item IO::AIO::munlock $scalar, $offset = 0, $length = undef	2255	=item IO::AIO::munlock $scalar, $offset = 0, $length = undef
2162		2256
2163	Calls the C<munlock> function, undoing the effects of a previous	2257	Calls the C<munlock> function, undoing the effects of a previous
2164	C<aio_mlock> call (see its description for details).	2258	C<aio_mlock> call (see its description for details).
2165		2259
…		…
2214	C<$flags> is non-zero, fails with C<ENOSYS>.	2308	C<$flags> is non-zero, fails with C<ENOSYS>.
2215		2309
2216	Please refer to L<pipe2(2)> for more info on the C<$flags>, but at the	2310	Please refer to L<pipe2(2)> for more info on the C<$flags>, but at the
2217	time of this writing, C<IO::AIO::O_CLOEXEC>, C<IO::AIO::O_NONBLOCK> and	2311	time of this writing, C<IO::AIO::O_CLOEXEC>, C<IO::AIO::O_NONBLOCK> and
2218	C<IO::AIO::O_DIRECT> (Linux 3.4, for packet-based pipes) were supported.	2312	C<IO::AIO::O_DIRECT> (Linux 3.4, for packet-based pipes) were supported.
		2313
		2314	Example: create a pipe race-free w.r.t. threads and fork:
		2315
		2316	my ($rfh, $wfh) = IO::AIO::pipe2 IO::AIO::O_CLOEXEC
		2317	or die "pipe2: $!\n";
		2318
		2319	=item $fh = IO::AIO::eventfd [$initval, [$flags]]
		2320
		2321	This is a direct interface to the Linux L<eventfd(2)> system call. The
		2322	(unhelpful) defaults for C<$initval> and C<$flags> are C<0> for both.
		2323
		2324	On success, the new eventfd filehandle is returned, otherwise returns
		2325	C<undef>. If the eventfd syscall is missing, fails with C<ENOSYS>.
		2326
		2327	Please refer to L<eventfd(2)> for more info on this call.
		2328
		2329	The following symbol flag values are available: C<IO::AIO::EFD_CLOEXEC>,
		2330	C<IO::AIO::EFD_NONBLOCK> and C<IO::AIO::EFD_SEMAPHORE> (Linux 2.6.30).
		2331
		2332	Example: create a new eventfd filehandle:
		2333
		2334	$fh = IO::AIO::eventfd 0, IO::AIO::O_CLOEXEC
		2335	or die "eventfd: $!\n";
		2336
		2337	=item $fh = IO::AIO::timerfd_create $clockid[, $flags]
		2338
		2339	This is a direct interface to the Linux L<timerfd_create(2)> system call. The
		2340	(unhelpful) default for C<$flags> is C<0>.
		2341
		2342	On success, the new timerfd filehandle is returned, otherwise returns
		2343	C<undef>. If the eventfd syscall is missing, fails with C<ENOSYS>.
		2344
		2345	Please refer to L<timerfd_create(2)> for more info on this call.
		2346
		2347	The following C<$clockid> values are
		2348	available: C<IO::AIO::CLOCK_REALTIME>, C<IO::AIO::CLOCK_MONOTONIC>
		2349	C<IO::AIO::CLOCK_CLOCK_BOOTTIME> (Linux 3.15)
		2350	C<IO::AIO::CLOCK_CLOCK_REALTIME_ALARM> (Linux 3.11) and
		2351	C<IO::AIO::CLOCK_CLOCK_BOOTTIME_ALARM> (Linux 3.11).
		2352
		2353	The following C<$flags> values are available (Linux
		2354	2.6.27): C<IO::AIO::TFD_NONBLOCK> and C<IO::AIO::TFD_CLOEXEC>.
		2355
		2356	Example: create a new timerfd and set it to one-second repeated alarms,
		2357	then wait for two alarms:
		2358
		2359	my $fh = IO::AIO::timerfd_create IO::AIO::CLOCK_BOOTTIME, IO::AIO::TFD_CLOEXEC
		2360	or die "timerfd_create: $!\n";
		2361
		2362	defined IO::AIO::timerfd_settime $fh, 0, 1, 1
		2363	or die "timerfd_settime: $!\n";
		2364
		2365	for (1..2) {
		2366	8 == sysread $fh, my $buf, 8
		2367	or die "timerfd read failure\n";
		2368
		2369	printf "number of expirations (likely 1): %d\n",
		2370	unpack "Q", $buf;
		2371	}
		2372
		2373	=item ($cur_interval, $cur_value) = IO::AIO::timerfd_settime $fh, $flags, $new_interval, $nbw_value
		2374
		2375	This is a direct interface to the Linux L<timerfd_settime(2)> system
		2376	call. Please refer to its manpage for more info on this call.
		2377
		2378	The new itimerspec is specified using two (possibly fractional) second
		2379	values, C<$new_interval> and C<$new_value>).
		2380
		2381	On success, the current interval and value are returned (as per
		2382	C<timerfd_gettime>). On failure, the empty list is returned.
		2383
		2384	The following C<$flags> values are
		2385	available: C<IO::AIO::TFD_TIMER_ABSTIME> and
		2386	C<IO::AIO::TFD_TIMER_CANCEL_ON_SET>.
		2387
		2388	See C<IO::AIO::timerfd_create> for a full example.
		2389
		2390	=item ($cur_interval, $cur_value) = IO::AIO::timerfd_gettime $fh
		2391
		2392	This is a direct interface to the Linux L<timerfd_gettime(2)> system
		2393	call. Please refer to its manpage for more info on this call.
		2394
		2395	On success, returns the current values of interval and value for the given
		2396	timerfd (as potentially fractional second values). On failure, the empty
		2397	list is returned.
2219		2398
2220	=back	2399	=back
2221		2400
2222	=cut	2401	=cut
2223		2402
…		…
2289	the process will result in undefined behaviour. Calling it at any time	2468	the process will result in undefined behaviour. Calling it at any time
2290	will also result in any undefined (by POSIX) behaviour.	2469	will also result in any undefined (by POSIX) behaviour.
2291		2470
2292	=back	2471	=back
2293		2472
		2473	=head2 LINUX-SPECIFIC CALLS
		2474
		2475	When a call is documented as "linux-specific" then this means it
		2476	originated on GNU/Linux. C<IO::AIO> will usually try to autodetect the
		2477	availability and compatibility of such calls regardless of the platform
		2478	it is compiled on, so platforms such as FreeBSD which often implement
		2479	these calls will work. When in doubt, call them and see if they fail wth
		2480	C<ENOSYS>.
		2481
2294	=head2 MEMORY USAGE	2482	=head2 MEMORY USAGE
2295		2483
2296	Per-request usage:	2484	Per-request usage:
2297		2485
2298	Each aio request uses - depending on your architecture - around 100-200	2486	Each aio request uses - depending on your architecture - around 100-200
…		…
2310	temporary buffers, and each thread requires a stack and other data	2498	temporary buffers, and each thread requires a stack and other data
2311	structures (usually around 16k-128k, depending on the OS).	2499	structures (usually around 16k-128k, depending on the OS).
2312		2500
2313	=head1 KNOWN BUGS	2501	=head1 KNOWN BUGS
2314		2502
2315	Known bugs will be fixed in the next release.	2503	Known bugs will be fixed in the next release :)
		2504
		2505	=head1 KNOWN ISSUES
		2506
		2507	Calls that try to "import" foreign memory areas (such as C<IO::AIO::mmap>
		2508	or C<IO::AIO::aio_slurp>) do not work with generic lvalues, such as
		2509	non-created hash slots or other scalars I didn't think of. It's best to
		2510	avoid such and either use scalar variables or making sure that the scalar
		2511	exists (e.g. by storing C<undef>) and isn't "funny" (e.g. tied).
		2512
		2513	I am not sure anything can be done about this, so this is considered a
		2514	known issue, rather than a bug.
2316		2515
2317	=head1 SEE ALSO	2516	=head1 SEE ALSO
2318		2517
2319	L<AnyEvent::AIO> for easy integration into event loops, L<Coro::AIO> for a	2518	L<AnyEvent::AIO> for easy integration into event loops, L<Coro::AIO> for a
2320	more natural syntax.	2519	more natural syntax.

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Comparing IO-AIO/AIO.pm (file contents): Revision 1.280 by root, Mon Feb 19 13:37:13 2018 UTC vs. Revision 1.289 by root, Sun Aug 12 05:21:35 2018 UTC

Diff Legend

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.280 by root, Mon Feb 19 13:37:13 2018 UTC vs.
Revision 1.289 by root, Sun Aug 12 05:21:35 2018 UTC