1 | =head1 NAME |
1 | =head1 NAME |
2 | |
2 | |
3 | IO::AIO - Asynchronous Input/Output |
3 | IO::AIO - Asynchronous/Advanced Input/Output |
4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
7 | use IO::AIO; |
7 | use IO::AIO; |
8 | |
8 | |
… | |
… | |
58 | not well-supported or restricted (GNU/Linux doesn't allow them on normal |
58 | not well-supported or restricted (GNU/Linux doesn't allow them on normal |
59 | files currently, for example), and they would only support aio_read and |
59 | files currently, for example), and they would only support aio_read and |
60 | aio_write, so the remaining functionality would have to be implemented |
60 | aio_write, so the remaining functionality would have to be implemented |
61 | using threads anyway. |
61 | using threads anyway. |
62 | |
62 | |
|
|
63 | In addition to asynchronous I/O, this module also exports some rather |
|
|
64 | arcane interfaces, such as C<madvise> or linux's C<splice> system call, |
|
|
65 | which is why the C<A> in C<AIO> can also mean I<advanced>. |
|
|
66 | |
63 | Although the module will work in the presence of other (Perl-) threads, |
67 | Although the module will work in the presence of other (Perl-) threads, |
64 | it is currently not reentrant in any way, so use appropriate locking |
68 | it is currently not reentrant in any way, so use appropriate locking |
65 | yourself, always call C<poll_cb> from within the same thread, or never |
69 | yourself, always call C<poll_cb> from within the same thread, or never |
66 | call C<poll_cb> (or other C<aio_> functions) recursively. |
70 | call C<poll_cb> (or other C<aio_> functions) recursively. |
67 | |
71 | |
… | |
… | |
94 | |
98 | |
95 | # file contents now in $contents |
99 | # file contents now in $contents |
96 | print $contents; |
100 | print $contents; |
97 | |
101 | |
98 | # exit event loop and program |
102 | # exit event loop and program |
99 | EV::unloop; |
103 | EV::break; |
100 | }; |
104 | }; |
101 | }; |
105 | }; |
102 | |
106 | |
103 | # possibly queue up other requests, or open GUI windows, |
107 | # possibly queue up other requests, or open GUI windows, |
104 | # check for sockets etc. etc. |
108 | # check for sockets etc. etc. |
105 | |
109 | |
106 | # process events as long as there are some: |
110 | # process events as long as there are some: |
107 | EV::loop; |
111 | EV::run; |
108 | |
112 | |
109 | =head1 REQUEST ANATOMY AND LIFETIME |
113 | =head1 REQUEST ANATOMY AND LIFETIME |
110 | |
114 | |
111 | Every C<aio_*> function creates a request. which is a C data structure not |
115 | Every C<aio_*> function creates a request. which is a C data structure not |
112 | directly visible to Perl. |
116 | directly visible to Perl. |
… | |
… | |
167 | use common::sense; |
171 | use common::sense; |
168 | |
172 | |
169 | use base 'Exporter'; |
173 | use base 'Exporter'; |
170 | |
174 | |
171 | BEGIN { |
175 | BEGIN { |
172 | our $VERSION = 4.32; |
176 | our $VERSION = 4.72; |
173 | |
177 | |
174 | 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 |
175 | 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 |
176 | aio_scandir aio_symlink aio_readlink aio_realpath aio_sync |
180 | aio_scandir aio_symlink aio_readlink aio_realpath aio_fcntl aio_ioctl |
177 | aio_fsync aio_syncfs aio_fdatasync aio_sync_file_range aio_allocate |
181 | aio_sync aio_fsync aio_syncfs aio_fdatasync aio_sync_file_range |
178 | aio_pathsync aio_readahead aio_fiemap |
182 | aio_pathsync aio_readahead aio_fiemap aio_allocate |
179 | aio_rename aio_link aio_move aio_copy aio_group |
183 | aio_rename aio_rename2 aio_link aio_move aio_copy aio_group |
180 | aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown |
184 | aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown |
181 | aio_chmod aio_utime aio_truncate |
185 | aio_chmod aio_utime aio_truncate |
182 | aio_msync aio_mtouch aio_mlock aio_mlockall |
186 | aio_msync aio_mtouch aio_mlock aio_mlockall |
183 | aio_statvfs |
187 | aio_statvfs |
|
|
188 | aio_slurp |
184 | aio_wd); |
189 | aio_wd); |
185 | |
190 | |
186 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); |
191 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); |
187 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
192 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
188 | min_parallel max_parallel max_idle idle_timeout |
193 | min_parallel max_parallel max_idle idle_timeout |
189 | nreqs nready npending nthreads |
194 | nreqs nready npending nthreads |
190 | max_poll_time max_poll_reqs |
195 | max_poll_time max_poll_reqs |
191 | sendfile fadvise madvise |
196 | sendfile fadvise madvise |
192 | mmap munmap munlock munlockall); |
197 | mmap munmap mremap munlock munlockall); |
193 | |
198 | |
194 | push @AIO_REQ, qw(aio_busy); # not exported |
199 | push @AIO_REQ, qw(aio_busy); # not exported |
195 | |
200 | |
196 | @IO::AIO::GRP::ISA = 'IO::AIO::REQ'; |
201 | @IO::AIO::GRP::ISA = 'IO::AIO::REQ'; |
197 | |
202 | |
… | |
… | |
229 | aio_link $srcpath, $dstpath, $callback->($status) |
234 | aio_link $srcpath, $dstpath, $callback->($status) |
230 | aio_symlink $srcpath, $dstpath, $callback->($status) |
235 | aio_symlink $srcpath, $dstpath, $callback->($status) |
231 | aio_readlink $pathname, $callback->($link) |
236 | aio_readlink $pathname, $callback->($link) |
232 | aio_realpath $pathname, $callback->($path) |
237 | aio_realpath $pathname, $callback->($path) |
233 | aio_rename $srcpath, $dstpath, $callback->($status) |
238 | aio_rename $srcpath, $dstpath, $callback->($status) |
|
|
239 | aio_rename2 $srcpath, $dstpath, $flags, $callback->($status) |
234 | aio_mkdir $pathname, $mode, $callback->($status) |
240 | aio_mkdir $pathname, $mode, $callback->($status) |
235 | aio_rmdir $pathname, $callback->($status) |
241 | aio_rmdir $pathname, $callback->($status) |
236 | aio_readdir $pathname, $callback->($entries) |
242 | aio_readdir $pathname, $callback->($entries) |
237 | aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
243 | aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
238 | IO::AIO::READDIR_DENTS IO::AIO::READDIR_DIRS_FIRST |
244 | IO::AIO::READDIR_DENTS IO::AIO::READDIR_DIRS_FIRST |
… | |
… | |
240 | aio_scandir $pathname, $maxreq, $callback->($dirs, $nondirs) |
246 | aio_scandir $pathname, $maxreq, $callback->($dirs, $nondirs) |
241 | aio_load $pathname, $data, $callback->($status) |
247 | aio_load $pathname, $data, $callback->($status) |
242 | aio_copy $srcpath, $dstpath, $callback->($status) |
248 | aio_copy $srcpath, $dstpath, $callback->($status) |
243 | aio_move $srcpath, $dstpath, $callback->($status) |
249 | aio_move $srcpath, $dstpath, $callback->($status) |
244 | aio_rmtree $pathname, $callback->($status) |
250 | aio_rmtree $pathname, $callback->($status) |
|
|
251 | aio_fcntl $fh, $cmd, $arg, $callback->($status) |
|
|
252 | aio_ioctl $fh, $request, $buf, $callback->($status) |
245 | aio_sync $callback->($status) |
253 | aio_sync $callback->($status) |
246 | aio_syncfs $fh, $callback->($status) |
254 | aio_syncfs $fh, $callback->($status) |
247 | aio_fsync $fh, $callback->($status) |
255 | aio_fsync $fh, $callback->($status) |
248 | aio_fdatasync $fh, $callback->($status) |
256 | aio_fdatasync $fh, $callback->($status) |
249 | aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
257 | aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
250 | aio_pathsync $pathname, $callback->($status) |
258 | aio_pathsync $pathname, $callback->($status) |
251 | aio_msync $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
259 | aio_msync $scalar, $offset = 0, $length = undef, flags = MS_SYNC, $callback->($status) |
252 | aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
260 | aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
253 | aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
261 | aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
254 | aio_mlockall $flags, $callback->($status) |
262 | aio_mlockall $flags, $callback->($status) |
255 | aio_group $callback->(...) |
263 | aio_group $callback->(...) |
256 | aio_nop $callback->() |
264 | aio_nop $callback->() |
… | |
… | |
270 | IO::AIO::idle_timeout $seconds |
278 | IO::AIO::idle_timeout $seconds |
271 | IO::AIO::max_outstanding $maxreqs |
279 | IO::AIO::max_outstanding $maxreqs |
272 | IO::AIO::nreqs |
280 | IO::AIO::nreqs |
273 | IO::AIO::nready |
281 | IO::AIO::nready |
274 | IO::AIO::npending |
282 | IO::AIO::npending |
|
|
283 | IO::AIO::reinit |
|
|
284 | |
|
|
285 | $nfd = IO::AIO::get_fdlimit [EXPERIMENTAL] |
|
|
286 | IO::AIO::min_fdlimit $nfd [EXPERIMENTAL] |
275 | |
287 | |
276 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
288 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
277 | IO::AIO::fadvise $fh, $offset, $len, $advice |
289 | IO::AIO::fadvise $fh, $offset, $len, $advice |
|
|
290 | |
278 | IO::AIO::mmap $scalar, $length, $prot, $flags[, $fh[, $offset]] |
291 | IO::AIO::mmap $scalar, $length, $prot, $flags[, $fh[, $offset]] |
279 | IO::AIO::munmap $scalar |
292 | IO::AIO::munmap $scalar |
|
|
293 | IO::AIO::mremap $scalar, $new_length, $flags[, $new_address] |
280 | IO::AIO::madvise $scalar, $offset, $length, $advice |
294 | IO::AIO::madvise $scalar, $offset, $length, $advice |
281 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
295 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
282 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
296 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
283 | IO::AIO::munlockall |
297 | IO::AIO::munlockall |
|
|
298 | |
|
|
299 | # stat extensions |
|
|
300 | $counter = IO::AIO::st_gen |
|
|
301 | $seconds = IO::AIO::st_atime, IO::AIO::st_mtime, IO::AIO::st_ctime, IO::AIO::st_btime |
|
|
302 | ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtime |
|
|
303 | $nanoseconds = IO::AIO::st_atimensec, IO::AIO::st_mtimensec, IO::AIO::st_ctimensec, IO::AIO::st_btimensec |
|
|
304 | $seconds = IO::AIO::st_btimesec |
|
|
305 | ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtimensec |
|
|
306 | |
|
|
307 | # very much unportable syscalls |
|
|
308 | IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags |
|
|
309 | IO::AIO::tee $r_fh, $w_fh, $length, $flags |
|
|
310 | $actual_size = IO::AIO::pipesize $r_fh[, $new_size] |
|
|
311 | ($rfh, $wfh) = IO::AIO::pipe2 [$flags] |
|
|
312 | $fh = IO::AIO::memfd_create $pathname[, $flags] |
|
|
313 | $fh = IO::AIO::eventfd [$initval, [$flags]] |
|
|
314 | $fh = IO::AIO::timerfd_create $clockid[, $flags] |
|
|
315 | ($cur_interval, $cur_value) = IO::AIO::timerfd_settime $fh, $flags, $new_interval, $nbw_value |
|
|
316 | ($cur_interval, $cur_value) = IO::AIO::timerfd_gettime $fh |
284 | |
317 | |
285 | =head2 API NOTES |
318 | =head2 API NOTES |
286 | |
319 | |
287 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
320 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
288 | with the same name (sans C<aio_>). The arguments are similar or identical, |
321 | with the same name (sans C<aio_>). The arguments are similar or identical, |
… | |
… | |
394 | following POSIX and non-POSIX constants are available (missing ones on |
427 | following POSIX and non-POSIX constants are available (missing ones on |
395 | your system are, as usual, C<0>): |
428 | your system are, as usual, C<0>): |
396 | |
429 | |
397 | C<O_ASYNC>, C<O_DIRECT>, C<O_NOATIME>, C<O_CLOEXEC>, C<O_NOCTTY>, C<O_NOFOLLOW>, |
430 | C<O_ASYNC>, C<O_DIRECT>, C<O_NOATIME>, C<O_CLOEXEC>, C<O_NOCTTY>, C<O_NOFOLLOW>, |
398 | C<O_NONBLOCK>, C<O_EXEC>, C<O_SEARCH>, C<O_DIRECTORY>, C<O_DSYNC>, |
431 | C<O_NONBLOCK>, C<O_EXEC>, C<O_SEARCH>, C<O_DIRECTORY>, C<O_DSYNC>, |
399 | C<O_RSYNC>, C<O_SYNC>, C<O_PATH>, C<O_TMPFILE>, and C<O_TTY_INIT>. |
432 | C<O_RSYNC>, C<O_SYNC>, C<O_PATH>, C<O_TMPFILE>, C<O_TTY_INIT> and C<O_ACCMODE>. |
400 | |
433 | |
401 | |
434 | |
402 | =item aio_close $fh, $callback->($status) |
435 | =item aio_close $fh, $callback->($status) |
403 | |
436 | |
404 | Asynchronously close a file and call the callback with the result |
437 | Asynchronously close a file and call the callback with the result |
… | |
… | |
439 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
472 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
440 | |
473 | |
441 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
474 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
442 | |
475 | |
443 | Reads or writes C<$length> bytes from or to the specified C<$fh> and |
476 | Reads or writes C<$length> bytes from or to the specified C<$fh> and |
444 | C<$offset> into the scalar given by C<$data> and offset C<$dataoffset> |
477 | C<$offset> into the scalar given by C<$data> and offset C<$dataoffset> and |
445 | and calls the callback without the actual number of bytes read (or -1 on |
478 | calls the callback with the actual number of bytes transferred (or -1 on |
446 | error, just like the syscall). |
479 | error, just like the syscall). |
447 | |
480 | |
448 | C<aio_read> will, like C<sysread>, shrink or grow the C<$data> scalar to |
481 | C<aio_read> will, like C<sysread>, shrink or grow the C<$data> scalar to |
449 | offset plus the actual number of bytes read. |
482 | offset plus the actual number of bytes read. |
450 | |
483 | |
… | |
… | |
508 | As native sendfile syscalls (as practically any non-POSIX interface hacked |
541 | As native sendfile syscalls (as practically any non-POSIX interface hacked |
509 | together in a hurry to improve benchmark numbers) tend to be rather buggy |
542 | together in a hurry to improve benchmark numbers) tend to be rather buggy |
510 | on many systems, this implementation tries to work around some known bugs |
543 | on many systems, this implementation tries to work around some known bugs |
511 | in Linux and FreeBSD kernels (probably others, too), but that might fail, |
544 | in Linux and FreeBSD kernels (probably others, too), but that might fail, |
512 | so you really really should check the return value of C<aio_sendfile> - |
545 | so you really really should check the return value of C<aio_sendfile> - |
513 | fewre bytes than expected might have been transferred. |
546 | fewer bytes than expected might have been transferred. |
514 | |
547 | |
515 | |
548 | |
516 | =item aio_readahead $fh,$offset,$length, $callback->($retval) |
549 | =item aio_readahead $fh,$offset,$length, $callback->($retval) |
517 | |
550 | |
518 | C<aio_readahead> populates the page cache with data from a file so that |
551 | C<aio_readahead> populates the page cache with data from a file so that |
… | |
… | |
522 | whole pages, so that offset is effectively rounded down to a page boundary |
555 | whole pages, so that offset is effectively rounded down to a page boundary |
523 | and bytes are read up to the next page boundary greater than or equal to |
556 | and bytes are read up to the next page boundary greater than or equal to |
524 | (off-set+length). C<aio_readahead> does not read beyond the end of the |
557 | (off-set+length). C<aio_readahead> does not read beyond the end of the |
525 | file. The current file offset of the file is left unchanged. |
558 | file. The current file offset of the file is left unchanged. |
526 | |
559 | |
527 | If that syscall doesn't exist (likely if your OS isn't Linux) it will be |
560 | If that syscall doesn't exist (likely if your kernel isn't Linux) it will |
528 | emulated by simply reading the data, which would have a similar effect. |
561 | be emulated by simply reading the data, which would have a similar effect. |
529 | |
562 | |
530 | |
563 | |
531 | =item aio_stat $fh_or_path, $callback->($status) |
564 | =item aio_stat $fh_or_path, $callback->($status) |
532 | |
565 | |
533 | =item aio_lstat $fh, $callback->($status) |
566 | =item aio_lstat $fh, $callback->($status) |
534 | |
567 | |
535 | Works like perl's C<stat> or C<lstat> in void context. The callback will |
568 | Works almost exactly like perl's C<stat> or C<lstat> in void context. The |
536 | be called after the stat and the results will be available using C<stat _> |
569 | callback will be called after the stat and the results will be available |
537 | or C<-s _> etc... |
570 | using C<stat _> or C<-s _> and other tests (with the exception of C<-B> |
|
|
571 | and C<-T>). |
538 | |
572 | |
539 | The pathname passed to C<aio_stat> must be absolute. See API NOTES, above, |
573 | The pathname passed to C<aio_stat> must be absolute. See API NOTES, above, |
540 | for an explanation. |
574 | for an explanation. |
541 | |
575 | |
542 | Currently, the stats are always 64-bit-stats, i.e. instead of returning an |
576 | Currently, the stats are always 64-bit-stats, i.e. instead of returning an |
… | |
… | |
549 | behaviour). |
583 | behaviour). |
550 | |
584 | |
551 | C<S_IFMT>, C<S_IFIFO>, C<S_IFCHR>, C<S_IFBLK>, C<S_IFLNK>, C<S_IFREG>, |
585 | C<S_IFMT>, C<S_IFIFO>, C<S_IFCHR>, C<S_IFBLK>, C<S_IFLNK>, C<S_IFREG>, |
552 | C<S_IFDIR>, C<S_IFWHT>, C<S_IFSOCK>, C<IO::AIO::major $dev_t>, |
586 | C<S_IFDIR>, C<S_IFWHT>, C<S_IFSOCK>, C<IO::AIO::major $dev_t>, |
553 | C<IO::AIO::minor $dev_t>, C<IO::AIO::makedev $major, $minor>. |
587 | C<IO::AIO::minor $dev_t>, C<IO::AIO::makedev $major, $minor>. |
|
|
588 | |
|
|
589 | To access higher resolution stat timestamps, see L<SUBSECOND STAT TIME |
|
|
590 | ACCESS>. |
554 | |
591 | |
555 | Example: Print the length of F</etc/passwd>: |
592 | Example: Print the length of F</etc/passwd>: |
556 | |
593 | |
557 | aio_stat "/etc/passwd", sub { |
594 | aio_stat "/etc/passwd", sub { |
558 | $_[0] and die "stat failed: $!"; |
595 | $_[0] and die "stat failed: $!"; |
… | |
… | |
602 | namemax => 255, |
639 | namemax => 255, |
603 | frsize => 1024, |
640 | frsize => 1024, |
604 | fsid => 1810 |
641 | fsid => 1810 |
605 | } |
642 | } |
606 | |
643 | |
607 | Here is a (likely partial - send me updates!) list of fsid values used by |
|
|
608 | Linux - it is safe to hardcode these when C<$^O> is C<linux>: |
|
|
609 | |
|
|
610 | 0x0000adf5 adfs |
|
|
611 | 0x0000adff affs |
|
|
612 | 0x5346414f afs |
|
|
613 | 0x09041934 anon-inode filesystem |
|
|
614 | 0x00000187 autofs |
|
|
615 | 0x42465331 befs |
|
|
616 | 0x1badface bfs |
|
|
617 | 0x42494e4d binfmt_misc |
|
|
618 | 0x9123683e btrfs |
|
|
619 | 0x0027e0eb cgroupfs |
|
|
620 | 0xff534d42 cifs |
|
|
621 | 0x73757245 coda |
|
|
622 | 0x012ff7b7 coh |
|
|
623 | 0x28cd3d45 cramfs |
|
|
624 | 0x453dcd28 cramfs-wend (wrong endianness) |
|
|
625 | 0x64626720 debugfs |
|
|
626 | 0x00001373 devfs |
|
|
627 | 0x00001cd1 devpts |
|
|
628 | 0x0000f15f ecryptfs |
|
|
629 | 0x00414a53 efs |
|
|
630 | 0x0000137d ext |
|
|
631 | 0x0000ef53 ext2/ext3 |
|
|
632 | 0x0000ef51 ext2 |
|
|
633 | 0x00004006 fat |
|
|
634 | 0x65735546 fuseblk |
|
|
635 | 0x65735543 fusectl |
|
|
636 | 0x0bad1dea futexfs |
|
|
637 | 0x01161970 gfs2 |
|
|
638 | 0x47504653 gpfs |
|
|
639 | 0x00004244 hfs |
|
|
640 | 0xf995e849 hpfs |
|
|
641 | 0x958458f6 hugetlbfs |
|
|
642 | 0x2bad1dea inotifyfs |
|
|
643 | 0x00009660 isofs |
|
|
644 | 0x000072b6 jffs2 |
|
|
645 | 0x3153464a jfs |
|
|
646 | 0x6b414653 k-afs |
|
|
647 | 0x0bd00bd0 lustre |
|
|
648 | 0x0000137f minix |
|
|
649 | 0x0000138f minix 30 char names |
|
|
650 | 0x00002468 minix v2 |
|
|
651 | 0x00002478 minix v2 30 char names |
|
|
652 | 0x00004d5a minix v3 |
|
|
653 | 0x19800202 mqueue |
|
|
654 | 0x00004d44 msdos |
|
|
655 | 0x0000564c novell |
|
|
656 | 0x00006969 nfs |
|
|
657 | 0x6e667364 nfsd |
|
|
658 | 0x00003434 nilfs |
|
|
659 | 0x5346544e ntfs |
|
|
660 | 0x00009fa1 openprom |
|
|
661 | 0x7461636F ocfs2 |
|
|
662 | 0x00009fa0 proc |
|
|
663 | 0x6165676c pstorefs |
|
|
664 | 0x0000002f qnx4 |
|
|
665 | 0x858458f6 ramfs |
|
|
666 | 0x52654973 reiserfs |
|
|
667 | 0x00007275 romfs |
|
|
668 | 0x67596969 rpc_pipefs |
|
|
669 | 0x73636673 securityfs |
|
|
670 | 0xf97cff8c selinux |
|
|
671 | 0x0000517b smb |
|
|
672 | 0x534f434b sockfs |
|
|
673 | 0x73717368 squashfs |
|
|
674 | 0x62656572 sysfs |
|
|
675 | 0x012ff7b6 sysv2 |
|
|
676 | 0x012ff7b5 sysv4 |
|
|
677 | 0x01021994 tmpfs |
|
|
678 | 0x15013346 udf |
|
|
679 | 0x00011954 ufs |
|
|
680 | 0x54190100 ufs byteswapped |
|
|
681 | 0x00009fa2 usbdevfs |
|
|
682 | 0x01021997 v9fs |
|
|
683 | 0xa501fcf5 vxfs |
|
|
684 | 0xabba1974 xenfs |
|
|
685 | 0x012ff7b4 xenix |
|
|
686 | 0x58465342 xfs |
|
|
687 | 0x012fd16d xia |
|
|
688 | |
|
|
689 | =item aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
644 | =item aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
690 | |
645 | |
691 | Works like perl's C<utime> function (including the special case of $atime |
646 | Works like perl's C<utime> function (including the special case of $atime |
692 | and $mtime being undef). Fractional times are supported if the underlying |
647 | and $mtime being undef). Fractional times are supported if the underlying |
693 | syscalls support them. |
648 | syscalls support them. |
694 | |
649 | |
695 | When called with a pathname, uses utimes(2) if available, otherwise |
650 | When called with a pathname, uses utimensat(2) or utimes(2) if available, |
696 | utime(2). If called on a file descriptor, uses futimes(2) if available, |
651 | otherwise utime(2). If called on a file descriptor, uses futimens(2) |
697 | otherwise returns ENOSYS, so this is not portable. |
652 | or futimes(2) if available, otherwise returns ENOSYS, so this is not |
|
|
653 | portable. |
698 | |
654 | |
699 | Examples: |
655 | Examples: |
700 | |
656 | |
701 | # set atime and mtime to current time (basically touch(1)): |
657 | # set atime and mtime to current time (basically touch(1)): |
702 | aio_utime "path", undef, undef; |
658 | aio_utime "path", undef, undef; |
… | |
… | |
730 | C<$mode> is usually C<0> or C<IO::AIO::FALLOC_FL_KEEP_SIZE> to allocate |
686 | C<$mode> is usually C<0> or C<IO::AIO::FALLOC_FL_KEEP_SIZE> to allocate |
731 | space, or C<IO::AIO::FALLOC_FL_PUNCH_HOLE | IO::AIO::FALLOC_FL_KEEP_SIZE>, |
687 | space, or C<IO::AIO::FALLOC_FL_PUNCH_HOLE | IO::AIO::FALLOC_FL_KEEP_SIZE>, |
732 | to deallocate a file range. |
688 | to deallocate a file range. |
733 | |
689 | |
734 | IO::AIO also supports C<FALLOC_FL_COLLAPSE_RANGE>, to remove a range |
690 | IO::AIO also supports C<FALLOC_FL_COLLAPSE_RANGE>, to remove a range |
735 | (without leaving a hole) and C<FALLOC_FL_ZERO_RANGE>, to zero a range (see |
691 | (without leaving a hole), C<FALLOC_FL_ZERO_RANGE>, to zero a range, |
736 | your L<fallocate(2)> manpage). |
692 | C<FALLOC_FL_INSERT_RANGE> to insert a range and C<FALLOC_FL_UNSHARE_RANGE> |
|
|
693 | to unshare shared blocks (see your L<fallocate(2)> manpage). |
737 | |
694 | |
738 | The file system block size used by C<fallocate> is presumably the |
695 | The file system block size used by C<fallocate> is presumably the |
739 | C<f_bsize> returned by C<statvfs>. |
696 | C<f_bsize> returned by C<statvfs>, but different filesystems and filetypes |
|
|
697 | can dictate other limitations. |
740 | |
698 | |
741 | If C<fallocate> isn't available or cannot be emulated (currently no |
699 | If C<fallocate> isn't available or cannot be emulated (currently no |
742 | emulation will be attempted), passes C<-1> and sets C<$!> to C<ENOSYS>. |
700 | emulation will be attempted), passes C<-1> and sets C<$!> to C<ENOSYS>. |
743 | |
701 | |
744 | |
702 | |
… | |
… | |
803 | On systems that support the AIO::WD working directory abstraction |
761 | On systems that support the AIO::WD working directory abstraction |
804 | natively, the case C<[$wd, "."]> as C<$srcpath> is specialcased - instead |
762 | natively, the case C<[$wd, "."]> as C<$srcpath> is specialcased - instead |
805 | of failing, C<rename> is called on the absolute path of C<$wd>. |
763 | of failing, C<rename> is called on the absolute path of C<$wd>. |
806 | |
764 | |
807 | |
765 | |
|
|
766 | =item aio_rename2 $srcpath, $dstpath, $flags, $callback->($status) |
|
|
767 | |
|
|
768 | Basically a version of C<aio_rename> with an additional C<$flags> |
|
|
769 | argument. Calling this with C<$flags=0> is the same as calling |
|
|
770 | C<aio_rename>. |
|
|
771 | |
|
|
772 | Non-zero flags are currently only supported on GNU/Linux systems that |
|
|
773 | support renameat2. Other systems fail with C<ENOSYS> in this case. |
|
|
774 | |
|
|
775 | The following constants are available (missing ones are, as usual C<0>), |
|
|
776 | see renameat2(2) for details: |
|
|
777 | |
|
|
778 | C<IO::AIO::RENAME_NOREPLACE>, C<IO::AIO::RENAME_EXCHANGE> |
|
|
779 | and C<IO::AIO::RENAME_WHITEOUT>. |
|
|
780 | |
|
|
781 | |
808 | =item aio_mkdir $pathname, $mode, $callback->($status) |
782 | =item aio_mkdir $pathname, $mode, $callback->($status) |
809 | |
783 | |
810 | Asynchronously mkdir (create) a directory and call the callback with |
784 | Asynchronously mkdir (create) a directory and call the callback with |
811 | the result code. C<$mode> will be modified by the umask at the time the |
785 | the result code. C<$mode> will be modified by the umask at the time the |
812 | request is executed, so do not change your umask. |
786 | request is executed, so do not change your umask. |
… | |
… | |
843 | |
817 | |
844 | =over 4 |
818 | =over 4 |
845 | |
819 | |
846 | =item IO::AIO::READDIR_DENTS |
820 | =item IO::AIO::READDIR_DENTS |
847 | |
821 | |
848 | When this flag is off, then the callback gets an arrayref consisting of |
822 | Normally the callback gets an arrayref consisting of names only (as |
849 | names only (as with C<aio_readdir>), otherwise it gets an arrayref with |
823 | with C<aio_readdir>). If this flag is set, then the callback gets an |
850 | C<[$name, $type, $inode]> arrayrefs, each describing a single directory |
824 | arrayref with C<[$name, $type, $inode]> arrayrefs, each describing a |
851 | entry in more detail. |
825 | single directory entry in more detail: |
852 | |
826 | |
853 | C<$name> is the name of the entry. |
827 | C<$name> is the name of the entry. |
854 | |
828 | |
855 | C<$type> is one of the C<IO::AIO::DT_xxx> constants: |
829 | C<$type> is one of the C<IO::AIO::DT_xxx> constants: |
856 | |
830 | |
857 | C<IO::AIO::DT_UNKNOWN>, C<IO::AIO::DT_FIFO>, C<IO::AIO::DT_CHR>, C<IO::AIO::DT_DIR>, |
831 | C<IO::AIO::DT_UNKNOWN>, C<IO::AIO::DT_FIFO>, C<IO::AIO::DT_CHR>, C<IO::AIO::DT_DIR>, |
858 | C<IO::AIO::DT_BLK>, C<IO::AIO::DT_REG>, C<IO::AIO::DT_LNK>, C<IO::AIO::DT_SOCK>, |
832 | C<IO::AIO::DT_BLK>, C<IO::AIO::DT_REG>, C<IO::AIO::DT_LNK>, C<IO::AIO::DT_SOCK>, |
859 | C<IO::AIO::DT_WHT>. |
833 | C<IO::AIO::DT_WHT>. |
860 | |
834 | |
861 | C<IO::AIO::DT_UNKNOWN> means just that: readdir does not know. If you need to |
835 | C<IO::AIO::DT_UNKNOWN> means just that: readdir does not know. If you need |
862 | know, you have to run stat yourself. Also, for speed reasons, the C<$type> |
836 | to know, you have to run stat yourself. Also, for speed/memory reasons, |
863 | scalars are read-only: you can not modify them. |
837 | the C<$type> scalars are read-only: you must not modify them. |
864 | |
838 | |
865 | C<$inode> is the inode number (which might not be exact on systems with 64 |
839 | C<$inode> is the inode number (which might not be exact on systems with 64 |
866 | bit inode numbers and 32 bit perls). This field has unspecified content on |
840 | bit inode numbers and 32 bit perls). This field has unspecified content on |
867 | systems that do not deliver the inode information. |
841 | systems that do not deliver the inode information. |
868 | |
842 | |
… | |
… | |
879 | short names are tried first. |
853 | short names are tried first. |
880 | |
854 | |
881 | =item IO::AIO::READDIR_STAT_ORDER |
855 | =item IO::AIO::READDIR_STAT_ORDER |
882 | |
856 | |
883 | When this flag is set, then the names will be returned in an order |
857 | When this flag is set, then the names will be returned in an order |
884 | suitable for stat()'ing each one. That is, when you plan to stat() |
858 | suitable for stat()'ing each one. That is, when you plan to stat() most or |
885 | all files in the given directory, then the returned order will likely |
859 | all files in the given directory, then the returned order will likely be |
886 | be fastest. |
860 | faster. |
887 | |
861 | |
888 | If both this flag and C<IO::AIO::READDIR_DIRS_FIRST> are specified, then |
862 | If both this flag and C<IO::AIO::READDIR_DIRS_FIRST> are specified, |
889 | the likely dirs come first, resulting in a less optimal stat order. |
863 | then the likely dirs come first, resulting in a less optimal stat order |
|
|
864 | for stat'ing all entries, but likely a more optimal order for finding |
|
|
865 | subdirectories. |
890 | |
866 | |
891 | =item IO::AIO::READDIR_FOUND_UNKNOWN |
867 | =item IO::AIO::READDIR_FOUND_UNKNOWN |
892 | |
868 | |
893 | This flag should not be set when calling C<aio_readdirx>. Instead, it |
869 | This flag should not be set when calling C<aio_readdirx>. Instead, it |
894 | is being set by C<aio_readdirx>, when any of the C<$type>'s found were |
870 | is being set by C<aio_readdirx>, when any of the C<$type>'s found were |
… | |
… | |
896 | C<$type>'s are known, which can be used to speed up some algorithms. |
872 | C<$type>'s are known, which can be used to speed up some algorithms. |
897 | |
873 | |
898 | =back |
874 | =back |
899 | |
875 | |
900 | |
876 | |
|
|
877 | =item aio_slurp $pathname, $offset, $length, $data, $callback->($status) |
|
|
878 | |
|
|
879 | Opens, reads and closes the given file. The data is put into C<$data>, |
|
|
880 | which is resized as required. |
|
|
881 | |
|
|
882 | If C<$offset> is negative, then it is counted from the end of the file. |
|
|
883 | |
|
|
884 | If C<$length> is zero, then the remaining length of the file is |
|
|
885 | used. Also, in this case, the same limitations to modifying C<$data> apply |
|
|
886 | as when IO::AIO::mmap is used, i.e. it must only be modified in-place |
|
|
887 | with C<substr>. If the size of the file is known, specifying a non-zero |
|
|
888 | C<$length> results in a performance advantage. |
|
|
889 | |
|
|
890 | This request is similar to the older C<aio_load> request, but since it is |
|
|
891 | a single request, it might be more efficient to use. |
|
|
892 | |
|
|
893 | Example: load F</etc/passwd> into C<$passwd>. |
|
|
894 | |
|
|
895 | my $passwd; |
|
|
896 | aio_slurp "/etc/passwd", 0, 0, $passwd, sub { |
|
|
897 | $_[0] >= 0 |
|
|
898 | or die "/etc/passwd: $!\n"; |
|
|
899 | |
|
|
900 | printf "/etc/passwd is %d bytes long, and contains:\n", length $passwd; |
|
|
901 | print $passwd; |
|
|
902 | }; |
|
|
903 | IO::AIO::flush; |
|
|
904 | |
|
|
905 | |
901 | =item aio_load $pathname, $data, $callback->($status) |
906 | =item aio_load $pathname, $data, $callback->($status) |
902 | |
907 | |
903 | This is a composite request that tries to fully load the given file into |
908 | This is a composite request that tries to fully load the given file into |
904 | memory. Status is the same as with aio_read. |
909 | memory. Status is the same as with aio_read. |
|
|
910 | |
|
|
911 | Using C<aio_slurp> might be more efficient, as it is a single request. |
905 | |
912 | |
906 | =cut |
913 | =cut |
907 | |
914 | |
908 | sub aio_load($$;$) { |
915 | sub aio_load($$;$) { |
909 | my ($path, undef, $cb) = @_; |
916 | my ($path, undef, $cb) = @_; |
… | |
… | |
929 | =item aio_copy $srcpath, $dstpath, $callback->($status) |
936 | =item aio_copy $srcpath, $dstpath, $callback->($status) |
930 | |
937 | |
931 | Try to copy the I<file> (directories not supported as either source or |
938 | Try to copy the I<file> (directories not supported as either source or |
932 | destination) from C<$srcpath> to C<$dstpath> and call the callback with |
939 | destination) from C<$srcpath> to C<$dstpath> and call the callback with |
933 | a status of C<0> (ok) or C<-1> (error, see C<$!>). |
940 | a status of C<0> (ok) or C<-1> (error, see C<$!>). |
|
|
941 | |
|
|
942 | Existing destination files will be truncated. |
934 | |
943 | |
935 | This is a composite request that creates the destination file with |
944 | This is a composite request that creates the destination file with |
936 | mode 0200 and copies the contents of the source file into it using |
945 | mode 0200 and copies the contents of the source file into it using |
937 | C<aio_sendfile>, followed by restoring atime, mtime, access mode and |
946 | C<aio_sendfile>, followed by restoring atime, mtime, access mode and |
938 | uid/gid, in that order. |
947 | uid/gid, in that order. |
… | |
… | |
1048 | Scans a directory (similar to C<aio_readdir>) but additionally tries to |
1057 | Scans a directory (similar to C<aio_readdir>) but additionally tries to |
1049 | efficiently separate the entries of directory C<$path> into two sets of |
1058 | efficiently separate the entries of directory C<$path> into two sets of |
1050 | names, directories you can recurse into (directories), and ones you cannot |
1059 | names, directories you can recurse into (directories), and ones you cannot |
1051 | recurse into (everything else, including symlinks to directories). |
1060 | recurse into (everything else, including symlinks to directories). |
1052 | |
1061 | |
1053 | C<aio_scandir> is a composite request that creates of many sub requests_ |
1062 | C<aio_scandir> is a composite request that generates many sub requests. |
1054 | C<$maxreq> specifies the maximum number of outstanding aio requests that |
1063 | C<$maxreq> specifies the maximum number of outstanding aio requests that |
1055 | this function generates. If it is C<< <= 0 >>, then a suitable default |
1064 | this function generates. If it is C<< <= 0 >>, then a suitable default |
1056 | will be chosen (currently 4). |
1065 | will be chosen (currently 4). |
1057 | |
1066 | |
1058 | On error, the callback is called without arguments, otherwise it receives |
1067 | On error, the callback is called without arguments, otherwise it receives |
… | |
… | |
1122 | aioreq_pri $pri; |
1131 | aioreq_pri $pri; |
1123 | add $grp aio_stat $wd, sub { |
1132 | add $grp aio_stat $wd, sub { |
1124 | return $grp->result () if $_[0]; |
1133 | return $grp->result () if $_[0]; |
1125 | my $now = time; |
1134 | my $now = time; |
1126 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
1135 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
|
|
1136 | my $rdxflags = READDIR_DIRS_FIRST; |
|
|
1137 | |
|
|
1138 | if ((stat _)[3] < 2) { |
|
|
1139 | # at least one non-POSIX filesystem exists |
|
|
1140 | # that returns useful DT_type values: btrfs, |
|
|
1141 | # so optimise for this here by requesting dents |
|
|
1142 | $rdxflags |= READDIR_DENTS; |
|
|
1143 | } |
1127 | |
1144 | |
1128 | # read the directory entries |
1145 | # read the directory entries |
1129 | aioreq_pri $pri; |
1146 | aioreq_pri $pri; |
1130 | add $grp aio_readdirx $wd, READDIR_DIRS_FIRST, sub { |
1147 | add $grp aio_readdirx $wd, $rdxflags, sub { |
1131 | my $entries = shift |
1148 | my ($entries, $flags) = @_ |
1132 | or return $grp->result (); |
1149 | or return $grp->result (); |
|
|
1150 | |
|
|
1151 | if ($rdxflags & READDIR_DENTS) { |
|
|
1152 | # if we requested type values, see if we can use them directly. |
|
|
1153 | |
|
|
1154 | # if there were any DT_UNKNOWN entries then we assume we |
|
|
1155 | # don't know. alternatively, we could assume that if we get |
|
|
1156 | # one DT_DIR, then all directories are indeed marked with |
|
|
1157 | # DT_DIR, but this seems not required for btrfs, and this |
|
|
1158 | # is basically the "btrfs can't get it's act together" code |
|
|
1159 | # branch. |
|
|
1160 | unless ($flags & READDIR_FOUND_UNKNOWN) { |
|
|
1161 | # now we have valid DT_ information for all entries, |
|
|
1162 | # so use it as an optimisation without further stat's. |
|
|
1163 | # they must also all be at the beginning of @$entries |
|
|
1164 | # by now. |
|
|
1165 | |
|
|
1166 | my $dirs; |
|
|
1167 | |
|
|
1168 | if (@$entries) { |
|
|
1169 | for (0 .. $#$entries) { |
|
|
1170 | if ($entries->[$_][1] != DT_DIR) { |
|
|
1171 | # splice out directories |
|
|
1172 | $dirs = [splice @$entries, 0, $_]; |
|
|
1173 | last; |
|
|
1174 | } |
|
|
1175 | } |
|
|
1176 | |
|
|
1177 | # if we didn't find any non-dir, then all entries are dirs |
|
|
1178 | unless ($dirs) { |
|
|
1179 | ($dirs, $entries) = ($entries, []); |
|
|
1180 | } |
|
|
1181 | } else { |
|
|
1182 | # directory is empty, so there are no sbdirs |
|
|
1183 | $dirs = []; |
|
|
1184 | } |
|
|
1185 | |
|
|
1186 | # either splice'd the directories out or the dir was empty. |
|
|
1187 | # convert dents to filenames |
|
|
1188 | $_ = $_->[0] for @$dirs; |
|
|
1189 | $_ = $_->[0] for @$entries; |
|
|
1190 | |
|
|
1191 | return $grp->result ($dirs, $entries); |
|
|
1192 | } |
|
|
1193 | |
|
|
1194 | # cannot use, so return to our old ways |
|
|
1195 | # by pretending we only scanned for names. |
|
|
1196 | $_ = $_->[0] for @$entries; |
|
|
1197 | } |
1133 | |
1198 | |
1134 | # stat the dir another time |
1199 | # stat the dir another time |
1135 | aioreq_pri $pri; |
1200 | aioreq_pri $pri; |
1136 | add $grp aio_stat $wd, sub { |
1201 | add $grp aio_stat $wd, sub { |
1137 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
1202 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
… | |
… | |
1224 | }; |
1289 | }; |
1225 | |
1290 | |
1226 | $grp |
1291 | $grp |
1227 | } |
1292 | } |
1228 | |
1293 | |
|
|
1294 | =item aio_fcntl $fh, $cmd, $arg, $callback->($status) |
|
|
1295 | |
|
|
1296 | =item aio_ioctl $fh, $request, $buf, $callback->($status) |
|
|
1297 | |
|
|
1298 | These work just like the C<fcntl> and C<ioctl> built-in functions, except |
|
|
1299 | they execute asynchronously and pass the return value to the callback. |
|
|
1300 | |
|
|
1301 | Both calls can be used for a lot of things, some of which make more sense |
|
|
1302 | to run asynchronously in their own thread, while some others make less |
|
|
1303 | sense. For example, calls that block waiting for external events, such |
|
|
1304 | as locking, will also lock down an I/O thread while it is waiting, which |
|
|
1305 | can deadlock the whole I/O system. At the same time, there might be no |
|
|
1306 | alternative to using a thread to wait. |
|
|
1307 | |
|
|
1308 | So in general, you should only use these calls for things that do |
|
|
1309 | (filesystem) I/O, not for things that wait for other events (network, |
|
|
1310 | other processes), although if you are careful and know what you are doing, |
|
|
1311 | you still can. |
|
|
1312 | |
|
|
1313 | The following constants are available and can be used for normal C<ioctl> |
|
|
1314 | and C<fcntl> as well (missing ones are, as usual C<0>): |
|
|
1315 | |
|
|
1316 | C<F_DUPFD_CLOEXEC>, |
|
|
1317 | |
|
|
1318 | C<F_OFD_GETLK>, C<F_OFD_SETLK>, C<F_OFD_GETLKW>, |
|
|
1319 | |
|
|
1320 | C<FIFREEZE>, C<FITHAW>, C<FITRIM>, C<FICLONE>, C<FICLONERANGE>, C<FIDEDUPERANGE>. |
|
|
1321 | |
|
|
1322 | C<F_ADD_SEALS>, C<F_GET_SEALS>, C<F_SEAL_SEAL>, C<F_SEAL_SHRINK>, C<F_SEAL_GROW> and |
|
|
1323 | C<F_SEAL_WRITE>. |
|
|
1324 | |
|
|
1325 | C<FS_IOC_GETFLAGS>, C<FS_IOC_SETFLAGS>, C<FS_IOC_GETVERSION>, C<FS_IOC_SETVERSION>, |
|
|
1326 | C<FS_IOC_FIEMAP>. |
|
|
1327 | |
|
|
1328 | C<FS_IOC_FSGETXATTR>, C<FS_IOC_FSSETXATTR>, C<FS_IOC_SET_ENCRYPTION_POLICY>, |
|
|
1329 | C<FS_IOC_GET_ENCRYPTION_PWSALT>, C<FS_IOC_GET_ENCRYPTION_POLICY>, C<FS_KEY_DESCRIPTOR_SIZE>. |
|
|
1330 | |
|
|
1331 | C<FS_SECRM_FL>, C<FS_UNRM_FL>, C<FS_COMPR_FL>, C<FS_SYNC_FL>, C<FS_IMMUTABLE_FL>, |
|
|
1332 | C<FS_APPEND_FL>, C<FS_NODUMP_FL>, C<FS_NOATIME_FL>, C<FS_DIRTY_FL>, |
|
|
1333 | C<FS_COMPRBLK_FL>, C<FS_NOCOMP_FL>, C<FS_ENCRYPT_FL>, C<FS_BTREE_FL>, |
|
|
1334 | C<FS_INDEX_FL>, C<FS_JOURNAL_DATA_FL>, C<FS_NOTAIL_FL>, C<FS_DIRSYNC_FL>, C<FS_TOPDIR_FL>, |
|
|
1335 | C<FS_FL_USER_MODIFIABLE>. |
|
|
1336 | |
|
|
1337 | C<FS_XFLAG_REALTIME>, C<FS_XFLAG_PREALLOC>, C<FS_XFLAG_IMMUTABLE>, C<FS_XFLAG_APPEND>, |
|
|
1338 | C<FS_XFLAG_SYNC>, C<FS_XFLAG_NOATIME>, C<FS_XFLAG_NODUMP>, C<FS_XFLAG_RTINHERIT>, |
|
|
1339 | C<FS_XFLAG_PROJINHERIT>, C<FS_XFLAG_NOSYMLINKS>, C<FS_XFLAG_EXTSIZE>, C<FS_XFLAG_EXTSZINHERIT>, |
|
|
1340 | C<FS_XFLAG_NODEFRAG>, C<FS_XFLAG_FILESTREAM>, C<FS_XFLAG_DAX>, C<FS_XFLAG_HASATTR>, |
|
|
1341 | |
1229 | =item aio_sync $callback->($status) |
1342 | =item aio_sync $callback->($status) |
1230 | |
1343 | |
1231 | Asynchronously call sync and call the callback when finished. |
1344 | Asynchronously call sync and call the callback when finished. |
1232 | |
1345 | |
1233 | =item aio_fsync $fh, $callback->($status) |
1346 | =item aio_fsync $fh, $callback->($status) |
… | |
… | |
1301 | }; |
1414 | }; |
1302 | |
1415 | |
1303 | $grp |
1416 | $grp |
1304 | } |
1417 | } |
1305 | |
1418 | |
1306 | =item aio_msync $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
1419 | =item aio_msync $scalar, $offset = 0, $length = undef, flags = MS_SYNC, $callback->($status) |
1307 | |
1420 | |
1308 | This is a rather advanced IO::AIO call, which only works on mmap(2)ed |
1421 | This is a rather advanced IO::AIO call, which only works on mmap(2)ed |
1309 | scalars (see the C<IO::AIO::mmap> function, although it also works on data |
1422 | scalars (see the C<IO::AIO::mmap> function, although it also works on data |
1310 | scalars managed by the L<Sys::Mmap> or L<Mmap> modules, note that the |
1423 | scalars managed by the L<Sys::Mmap> or L<Mmap> modules, note that the |
1311 | scalar must only be modified in-place while an aio operation is pending on |
1424 | scalar must only be modified in-place while an aio operation is pending on |
… | |
… | |
1313 | |
1426 | |
1314 | It calls the C<msync> function of your OS, if available, with the memory |
1427 | It calls the C<msync> function of your OS, if available, with the memory |
1315 | area starting at C<$offset> in the string and ending C<$length> bytes |
1428 | area starting at C<$offset> in the string and ending C<$length> bytes |
1316 | later. If C<$length> is negative, counts from the end, and if C<$length> |
1429 | later. If C<$length> is negative, counts from the end, and if C<$length> |
1317 | is C<undef>, then it goes till the end of the string. The flags can be |
1430 | is C<undef>, then it goes till the end of the string. The flags can be |
1318 | a combination of C<IO::AIO::MS_ASYNC>, C<IO::AIO::MS_INVALIDATE> and |
1431 | either C<IO::AIO::MS_ASYNC> or C<IO::AIO::MS_SYNC>, plus an optional |
1319 | C<IO::AIO::MS_SYNC>. |
1432 | C<IO::AIO::MS_INVALIDATE>. |
1320 | |
1433 | |
1321 | =item aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
1434 | =item aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
1322 | |
1435 | |
1323 | This is a rather advanced IO::AIO call, which works best on mmap(2)ed |
1436 | This is a rather advanced IO::AIO call, which works best on mmap(2)ed |
1324 | scalars. |
1437 | scalars. |
… | |
… | |
1354 | IO::AIO::mmap $data, -s $fh, IO::AIO::PROT_READ, IO::AIO::MAP_SHARED, $fh; |
1467 | IO::AIO::mmap $data, -s $fh, IO::AIO::PROT_READ, IO::AIO::MAP_SHARED, $fh; |
1355 | aio_mlock $data; # mlock in background |
1468 | aio_mlock $data; # mlock in background |
1356 | |
1469 | |
1357 | =item aio_mlockall $flags, $callback->($status) |
1470 | =item aio_mlockall $flags, $callback->($status) |
1358 | |
1471 | |
1359 | Calls the C<mlockall> function with the given C<$flags> (a combination of |
1472 | Calls the C<mlockall> function with the given C<$flags> (a |
1360 | C<IO::AIO::MCL_CURRENT> and C<IO::AIO::MCL_FUTURE>). |
1473 | combination of C<IO::AIO::MCL_CURRENT>, C<IO::AIO::MCL_FUTURE> and |
|
|
1474 | C<IO::AIO::MCL_ONFAULT>). |
1361 | |
1475 | |
1362 | On systems that do not implement C<mlockall>, this function returns C<-1> |
1476 | On systems that do not implement C<mlockall>, this function returns C<-1> |
1363 | and sets errno to C<ENOSYS>. |
1477 | and sets errno to C<ENOSYS>. Similarly, flag combinations not supported |
|
|
1478 | by the system result in a return value of C<-1> with errno being set to |
|
|
1479 | C<EINVAL>. |
1364 | |
1480 | |
1365 | Note that the corresponding C<munlockall> is synchronous and is |
1481 | Note that the corresponding C<munlockall> is synchronous and is |
1366 | documented under L<MISCELLANEOUS FUNCTIONS>. |
1482 | documented under L<MISCELLANEOUS FUNCTIONS>. |
1367 | |
1483 | |
1368 | Example: asynchronously lock all current and future pages into memory. |
1484 | Example: asynchronously lock all current and future pages into memory. |
… | |
… | |
1407 | C<IO::AIO::FIEMAP_EXTENT_DATA_ENCRYPTED>, C<IO::AIO::FIEMAP_EXTENT_NOT_ALIGNED>, |
1523 | C<IO::AIO::FIEMAP_EXTENT_DATA_ENCRYPTED>, C<IO::AIO::FIEMAP_EXTENT_NOT_ALIGNED>, |
1408 | C<IO::AIO::FIEMAP_EXTENT_DATA_INLINE>, C<IO::AIO::FIEMAP_EXTENT_DATA_TAIL>, |
1524 | C<IO::AIO::FIEMAP_EXTENT_DATA_INLINE>, C<IO::AIO::FIEMAP_EXTENT_DATA_TAIL>, |
1409 | C<IO::AIO::FIEMAP_EXTENT_UNWRITTEN>, C<IO::AIO::FIEMAP_EXTENT_MERGED> or |
1525 | C<IO::AIO::FIEMAP_EXTENT_UNWRITTEN>, C<IO::AIO::FIEMAP_EXTENT_MERGED> or |
1410 | C<IO::AIO::FIEMAP_EXTENT_SHARED>. |
1526 | C<IO::AIO::FIEMAP_EXTENT_SHARED>. |
1411 | |
1527 | |
1412 | At the time of this writing (Linux 3.2), this requets is unreliable unless |
1528 | At the time of this writing (Linux 3.2), this request is unreliable unless |
1413 | C<$count> is C<undef>, as the kernel has all sorts of bugs preventing |
1529 | C<$count> is C<undef>, as the kernel has all sorts of bugs preventing |
1414 | it to return all extents of a range for files with large number of |
1530 | it to return all extents of a range for files with a large number of |
1415 | extents. The code works around all these issues if C<$count> is undef. |
1531 | extents. The code (only) works around all these issues if C<$count> is |
|
|
1532 | C<undef>. |
1416 | |
1533 | |
1417 | =item aio_group $callback->(...) |
1534 | =item aio_group $callback->(...) |
1418 | |
1535 | |
1419 | This is a very special aio request: Instead of doing something, it is a |
1536 | This is a very special aio request: Instead of doing something, it is a |
1420 | container for other aio requests, which is useful if you want to bundle |
1537 | container for other aio requests, which is useful if you want to bundle |
… | |
… | |
1533 | There are some caveats: when directories get renamed (or deleted), the |
1650 | There are some caveats: when directories get renamed (or deleted), the |
1534 | pathname string doesn't change, so will point to the new directory (or |
1651 | pathname string doesn't change, so will point to the new directory (or |
1535 | nowhere at all), while the directory fd, if available on the system, |
1652 | nowhere at all), while the directory fd, if available on the system, |
1536 | will still point to the original directory. Most functions accepting a |
1653 | will still point to the original directory. Most functions accepting a |
1537 | pathname will use the directory fd on newer systems, and the string on |
1654 | pathname will use the directory fd on newer systems, and the string on |
1538 | older systems. Some functions (such as realpath) will always rely on the |
1655 | older systems. Some functions (such as C<aio_realpath>) will always rely on |
1539 | string form of the pathname. |
1656 | the string form of the pathname. |
1540 | |
1657 | |
1541 | So this functionality is mainly useful to get some protection against |
1658 | So this functionality is mainly useful to get some protection against |
1542 | C<chdir>, to easily get an absolute path out of a relative path for future |
1659 | C<chdir>, to easily get an absolute path out of a relative path for future |
1543 | reference, and to speed up doing many operations in the same directory |
1660 | reference, and to speed up doing many operations in the same directory |
1544 | (e.g. when stat'ing all files in a directory). |
1661 | (e.g. when stat'ing all files in a directory). |
… | |
… | |
1752 | The default value for the limit is C<0>, but note that setting a feeder |
1869 | The default value for the limit is C<0>, but note that setting a feeder |
1753 | automatically bumps it up to C<2>. |
1870 | automatically bumps it up to C<2>. |
1754 | |
1871 | |
1755 | =back |
1872 | =back |
1756 | |
1873 | |
|
|
1874 | |
1757 | =head2 SUPPORT FUNCTIONS |
1875 | =head2 SUPPORT FUNCTIONS |
1758 | |
1876 | |
1759 | =head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION |
1877 | =head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION |
1760 | |
1878 | |
1761 | =over 4 |
1879 | =over 4 |
… | |
… | |
1826 | Strictly equivalent to: |
1944 | Strictly equivalent to: |
1827 | |
1945 | |
1828 | IO::AIO::poll_wait, IO::AIO::poll_cb |
1946 | IO::AIO::poll_wait, IO::AIO::poll_cb |
1829 | while IO::AIO::nreqs; |
1947 | while IO::AIO::nreqs; |
1830 | |
1948 | |
|
|
1949 | This function can be useful at program aborts, to make sure outstanding |
|
|
1950 | I/O has been done (C<IO::AIO> uses an C<END> block which already calls |
|
|
1951 | this function on normal exits), or when you are merely using C<IO::AIO> |
|
|
1952 | for its more advanced functions, rather than for async I/O, e.g.: |
|
|
1953 | |
|
|
1954 | my ($dirs, $nondirs); |
|
|
1955 | IO::AIO::aio_scandir "/tmp", 0, sub { ($dirs, $nondirs) = @_ }; |
|
|
1956 | IO::AIO::flush; |
|
|
1957 | # $dirs, $nondirs are now set |
|
|
1958 | |
1831 | =item IO::AIO::max_poll_reqs $nreqs |
1959 | =item IO::AIO::max_poll_reqs $nreqs |
1832 | |
1960 | |
1833 | =item IO::AIO::max_poll_time $seconds |
1961 | =item IO::AIO::max_poll_time $seconds |
1834 | |
1962 | |
1835 | These set the maximum number of requests (default C<0>, meaning infinity) |
1963 | These set the maximum number of requests (default C<0>, meaning infinity) |
… | |
… | |
1861 | poll => 'r', nice => 1, |
1989 | poll => 'r', nice => 1, |
1862 | cb => &IO::AIO::poll_cb); |
1990 | cb => &IO::AIO::poll_cb); |
1863 | |
1991 | |
1864 | =back |
1992 | =back |
1865 | |
1993 | |
|
|
1994 | |
1866 | =head3 CONTROLLING THE NUMBER OF THREADS |
1995 | =head3 CONTROLLING THE NUMBER OF THREADS |
1867 | |
1996 | |
1868 | =over |
1997 | =over |
1869 | |
1998 | |
1870 | =item IO::AIO::min_parallel $nthreads |
1999 | =item IO::AIO::min_parallel $nthreads |
… | |
… | |
1936 | This is a very bad function to use in interactive programs because it |
2065 | This is a very bad function to use in interactive programs because it |
1937 | blocks, and a bad way to reduce concurrency because it is inexact: Better |
2066 | blocks, and a bad way to reduce concurrency because it is inexact: Better |
1938 | use an C<aio_group> together with a feed callback. |
2067 | use an C<aio_group> together with a feed callback. |
1939 | |
2068 | |
1940 | Its main use is in scripts without an event loop - when you want to stat |
2069 | Its main use is in scripts without an event loop - when you want to stat |
1941 | a lot of files, you can write somehting like this: |
2070 | a lot of files, you can write something like this: |
1942 | |
2071 | |
1943 | IO::AIO::max_outstanding 32; |
2072 | IO::AIO::max_outstanding 32; |
1944 | |
2073 | |
1945 | for my $path (...) { |
2074 | for my $path (...) { |
1946 | aio_stat $path , ...; |
2075 | aio_stat $path , ...; |
… | |
… | |
1957 | The default value for C<max_outstanding> is very large, so there is no |
2086 | The default value for C<max_outstanding> is very large, so there is no |
1958 | practical limit on the number of outstanding requests. |
2087 | practical limit on the number of outstanding requests. |
1959 | |
2088 | |
1960 | =back |
2089 | =back |
1961 | |
2090 | |
|
|
2091 | |
1962 | =head3 STATISTICAL INFORMATION |
2092 | =head3 STATISTICAL INFORMATION |
1963 | |
2093 | |
1964 | =over |
2094 | =over |
1965 | |
2095 | |
1966 | =item IO::AIO::nreqs |
2096 | =item IO::AIO::nreqs |
… | |
… | |
1982 | |
2112 | |
1983 | Returns the number of requests currently in the pending state (executed, |
2113 | Returns the number of requests currently in the pending state (executed, |
1984 | but not yet processed by poll_cb). |
2114 | but not yet processed by poll_cb). |
1985 | |
2115 | |
1986 | =back |
2116 | =back |
|
|
2117 | |
|
|
2118 | |
|
|
2119 | =head3 SUBSECOND STAT TIME ACCESS |
|
|
2120 | |
|
|
2121 | Both C<aio_stat>/C<aio_lstat> and perl's C<stat>/C<lstat> functions can |
|
|
2122 | generally find access/modification and change times with subsecond time |
|
|
2123 | accuracy of the system supports it, but perl's built-in functions only |
|
|
2124 | return the integer part. |
|
|
2125 | |
|
|
2126 | The following functions return the timestamps of the most recent |
|
|
2127 | stat with subsecond precision on most systems and work both after |
|
|
2128 | C<aio_stat>/C<aio_lstat> and perl's C<stat>/C<lstat> calls. Their return |
|
|
2129 | value is only meaningful after a successful C<stat>/C<lstat> call, or |
|
|
2130 | during/after a successful C<aio_stat>/C<aio_lstat> callback. |
|
|
2131 | |
|
|
2132 | This is similar to the L<Time::HiRes> C<stat> functions, but can return |
|
|
2133 | full resolution without rounding and work with standard perl C<stat>, |
|
|
2134 | alleviating the need to call the special C<Time::HiRes> functions, which |
|
|
2135 | do not act like their perl counterparts. |
|
|
2136 | |
|
|
2137 | On operating systems or file systems where subsecond time resolution is |
|
|
2138 | not supported or could not be detected, a fractional part of C<0> is |
|
|
2139 | returned, so it is always safe to call these functions. |
|
|
2140 | |
|
|
2141 | =over 4 |
|
|
2142 | |
|
|
2143 | =item $seconds = IO::AIO::st_atime, IO::AIO::st_mtime, IO::AIO::st_ctime, IO::AIO::st_btime |
|
|
2144 | |
|
|
2145 | Return the access, modication, change or birth time, respectively, |
|
|
2146 | including fractional part. Due to the limited precision of floating point, |
|
|
2147 | the accuracy on most platforms is only a bit better than milliseconds |
|
|
2148 | for times around now - see the I<nsec> function family, below, for full |
|
|
2149 | accuracy. |
|
|
2150 | |
|
|
2151 | File birth time is only available when the OS and perl support it (on |
|
|
2152 | FreeBSD and NetBSD at the time of this writing, although support is |
|
|
2153 | adaptive, so if your OS/perl gains support, IO::AIO can take advantage of |
|
|
2154 | it). On systems where it isn't available, C<0> is currently returned, but |
|
|
2155 | this might change to C<undef> in a future version. |
|
|
2156 | |
|
|
2157 | =item ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtime |
|
|
2158 | |
|
|
2159 | Returns access, modification, change and birth time all in one go, and |
|
|
2160 | maybe more times in the future version. |
|
|
2161 | |
|
|
2162 | =item $nanoseconds = IO::AIO::st_atimensec, IO::AIO::st_mtimensec, IO::AIO::st_ctimensec, IO::AIO::st_btimensec |
|
|
2163 | |
|
|
2164 | Return the fractional access, modifcation, change or birth time, in nanoseconds, |
|
|
2165 | as an integer in the range C<0> to C<999999999>. |
|
|
2166 | |
|
|
2167 | Note that no accessors are provided for access, modification and |
|
|
2168 | change times - you need to get those from C<stat _> if required (C<int |
|
|
2169 | IO::AIO::st_atime> and so on will I<not> generally give you the correct |
|
|
2170 | value). |
|
|
2171 | |
|
|
2172 | =item $seconds = IO::AIO::st_btimesec |
|
|
2173 | |
|
|
2174 | The (integral) seconds part of the file birth time, if available. |
|
|
2175 | |
|
|
2176 | =item ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtimensec |
|
|
2177 | |
|
|
2178 | Like the functions above, but returns all four times in one go (and maybe |
|
|
2179 | more in future versions). |
|
|
2180 | |
|
|
2181 | =item $counter = IO::AIO::st_gen |
|
|
2182 | |
|
|
2183 | Returns the generation counter (in practice this is just a random number) |
|
|
2184 | of the file. This is only available on platforms which have this member in |
|
|
2185 | their C<struct stat> (most BSDs at the time of this writing) and generally |
|
|
2186 | only to the root usert. If unsupported, C<0> is returned, but this might |
|
|
2187 | change to C<undef> in a future version. |
|
|
2188 | |
|
|
2189 | =back |
|
|
2190 | |
|
|
2191 | Example: print the high resolution modification time of F</etc>, using |
|
|
2192 | C<stat>, and C<IO::AIO::aio_stat>. |
|
|
2193 | |
|
|
2194 | if (stat "/etc") { |
|
|
2195 | printf "stat(/etc) mtime: %f\n", IO::AIO::st_mtime; |
|
|
2196 | } |
|
|
2197 | |
|
|
2198 | IO::AIO::aio_stat "/etc", sub { |
|
|
2199 | $_[0] |
|
|
2200 | and return; |
|
|
2201 | |
|
|
2202 | printf "aio_stat(/etc) mtime: %d.%09d\n", (stat _)[9], IO::AIO::st_mtimensec; |
|
|
2203 | }; |
|
|
2204 | |
|
|
2205 | IO::AIO::flush; |
|
|
2206 | |
|
|
2207 | Output of the awbove on my system, showing reduced and full accuracy: |
|
|
2208 | |
|
|
2209 | stat(/etc) mtime: 1534043702.020808 |
|
|
2210 | aio_stat(/etc) mtime: 1534043702.020807792 |
|
|
2211 | |
1987 | |
2212 | |
1988 | =head3 MISCELLANEOUS FUNCTIONS |
2213 | =head3 MISCELLANEOUS FUNCTIONS |
1989 | |
2214 | |
1990 | IO::AIO implements some functions that are useful when you want to use |
2215 | IO::AIO implements some functions that are useful when you want to use |
1991 | some "Advanced I/O" function not available to in Perl, without going the |
2216 | some "Advanced I/O" function not available to in Perl, without going the |
1992 | "Asynchronous I/O" route. Many of these have an asynchronous C<aio_*> |
2217 | "Asynchronous I/O" route. Many of these have an asynchronous C<aio_*> |
1993 | counterpart. |
2218 | counterpart. |
1994 | |
2219 | |
1995 | =over 4 |
2220 | =over 4 |
|
|
2221 | |
|
|
2222 | =item $numfd = IO::AIO::get_fdlimit |
|
|
2223 | |
|
|
2224 | This function is I<EXPERIMENTAL> and subject to change. |
|
|
2225 | |
|
|
2226 | Tries to find the current file descriptor limit and returns it, or |
|
|
2227 | C<undef> and sets C<$!> in case of an error. The limit is one larger than |
|
|
2228 | the highest valid file descriptor number. |
|
|
2229 | |
|
|
2230 | =item IO::AIO::min_fdlimit [$numfd] |
|
|
2231 | |
|
|
2232 | This function is I<EXPERIMENTAL> and subject to change. |
|
|
2233 | |
|
|
2234 | Try to increase the current file descriptor limit(s) to at least C<$numfd> |
|
|
2235 | by changing the soft or hard file descriptor resource limit. If C<$numfd> |
|
|
2236 | is missing, it will try to set a very high limit, although this is not |
|
|
2237 | recommended when you know the actual minimum that you require. |
|
|
2238 | |
|
|
2239 | If the limit cannot be raised enough, the function makes a best-effort |
|
|
2240 | attempt to increase the limit as much as possible, using various |
|
|
2241 | tricks, while still failing. You can query the resulting limit using |
|
|
2242 | C<IO::AIO::get_fdlimit>. |
|
|
2243 | |
|
|
2244 | If an error occurs, returns C<undef> and sets C<$!>, otherwise returns |
|
|
2245 | true. |
1996 | |
2246 | |
1997 | =item IO::AIO::sendfile $ofh, $ifh, $offset, $count |
2247 | =item IO::AIO::sendfile $ofh, $ifh, $offset, $count |
1998 | |
2248 | |
1999 | Calls the C<eio_sendfile_sync> function, which is like C<aio_sendfile>, |
2249 | Calls the C<eio_sendfile_sync> function, which is like C<aio_sendfile>, |
2000 | but is blocking (this makes most sense if you know the input data is |
2250 | but is blocking (this makes most sense if you know the input data is |
… | |
… | |
2017 | =item IO::AIO::madvise $scalar, $offset, $len, $advice |
2267 | =item IO::AIO::madvise $scalar, $offset, $len, $advice |
2018 | |
2268 | |
2019 | Simply calls the C<posix_madvise> function (see its |
2269 | Simply calls the C<posix_madvise> function (see its |
2020 | manpage for details). The following advice constants are |
2270 | manpage for details). The following advice constants are |
2021 | available: C<IO::AIO::MADV_NORMAL>, C<IO::AIO::MADV_SEQUENTIAL>, |
2271 | available: C<IO::AIO::MADV_NORMAL>, C<IO::AIO::MADV_SEQUENTIAL>, |
2022 | C<IO::AIO::MADV_RANDOM>, C<IO::AIO::MADV_WILLNEED>, C<IO::AIO::MADV_DONTNEED>. |
2272 | C<IO::AIO::MADV_RANDOM>, C<IO::AIO::MADV_WILLNEED>, |
|
|
2273 | C<IO::AIO::MADV_DONTNEED>. |
|
|
2274 | |
|
|
2275 | If C<$offset> is negative, counts from the end. If C<$length> is negative, |
|
|
2276 | the remaining length of the C<$scalar> is used. If possible, C<$length> |
|
|
2277 | will be reduced to fit into the C<$scalar>. |
2023 | |
2278 | |
2024 | On systems that do not implement C<posix_madvise>, this function returns |
2279 | On systems that do not implement C<posix_madvise>, this function returns |
2025 | ENOSYS, otherwise the return value of C<posix_madvise>. |
2280 | ENOSYS, otherwise the return value of C<posix_madvise>. |
2026 | |
2281 | |
2027 | =item IO::AIO::mprotect $scalar, $offset, $len, $protect |
2282 | =item IO::AIO::mprotect $scalar, $offset, $len, $protect |
… | |
… | |
2029 | Simply calls the C<mprotect> function on the preferably AIO::mmap'ed |
2284 | Simply calls the C<mprotect> function on the preferably AIO::mmap'ed |
2030 | $scalar (see its manpage for details). The following protect |
2285 | $scalar (see its manpage for details). The following protect |
2031 | constants are available: C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_READ>, |
2286 | constants are available: C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_READ>, |
2032 | C<IO::AIO::PROT_WRITE>, C<IO::AIO::PROT_EXEC>. |
2287 | C<IO::AIO::PROT_WRITE>, C<IO::AIO::PROT_EXEC>. |
2033 | |
2288 | |
|
|
2289 | If C<$offset> is negative, counts from the end. If C<$length> is negative, |
|
|
2290 | the remaining length of the C<$scalar> is used. If possible, C<$length> |
|
|
2291 | will be reduced to fit into the C<$scalar>. |
|
|
2292 | |
2034 | On systems that do not implement C<mprotect>, this function returns |
2293 | On systems that do not implement C<mprotect>, this function returns |
2035 | ENOSYS, otherwise the return value of C<mprotect>. |
2294 | ENOSYS, otherwise the return value of C<mprotect>. |
2036 | |
2295 | |
2037 | =item IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset] |
2296 | =item IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset] |
2038 | |
2297 | |
2039 | Memory-maps a file (or anonymous memory range) and attaches it to the |
2298 | Memory-maps a file (or anonymous memory range) and attaches it to the |
2040 | given C<$scalar>, which will act like a string scalar. Returns true on |
2299 | given C<$scalar>, which will act like a string scalar. Returns true on |
2041 | success, and false otherwise. |
2300 | success, and false otherwise. |
2042 | |
2301 | |
|
|
2302 | The scalar must exist, but its contents do not matter - this means you |
|
|
2303 | cannot use a nonexistant array or hash element. When in doubt, C<undef> |
|
|
2304 | the scalar first. |
|
|
2305 | |
2043 | The only operations allowed on the scalar are C<substr>/C<vec> that don't |
2306 | The only operations allowed on the mmapped scalar are C<substr>/C<vec>, |
2044 | change the string length, and most read-only operations such as copying it |
2307 | which don't change the string length, and most read-only operations such |
2045 | or searching it with regexes and so on. |
2308 | as copying it or searching it with regexes and so on. |
2046 | |
2309 | |
2047 | Anything else is unsafe and will, at best, result in memory leaks. |
2310 | Anything else is unsafe and will, at best, result in memory leaks. |
2048 | |
2311 | |
2049 | The memory map associated with the C<$scalar> is automatically removed |
2312 | The memory map associated with the C<$scalar> is automatically removed |
2050 | when the C<$scalar> is destroyed, or when the C<IO::AIO::mmap> or |
2313 | when the C<$scalar> is undef'd or destroyed, or when the C<IO::AIO::mmap> |
2051 | C<IO::AIO::munmap> functions are called. |
2314 | or C<IO::AIO::munmap> functions are called on it. |
2052 | |
2315 | |
2053 | This calls the C<mmap>(2) function internally. See your system's manual |
2316 | This calls the C<mmap>(2) function internally. See your system's manual |
2054 | page for details on the C<$length>, C<$prot> and C<$flags> parameters. |
2317 | page for details on the C<$length>, C<$prot> and C<$flags> parameters. |
2055 | |
2318 | |
2056 | The C<$length> must be larger than zero and smaller than the actual |
2319 | The C<$length> must be larger than zero and smaller than the actual |
2057 | filesize. |
2320 | filesize. |
2058 | |
2321 | |
2059 | C<$prot> is a combination of C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_EXEC>, |
2322 | C<$prot> is a combination of C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_EXEC>, |
2060 | C<IO::AIO::PROT_READ> and/or C<IO::AIO::PROT_WRITE>, |
2323 | C<IO::AIO::PROT_READ> and/or C<IO::AIO::PROT_WRITE>, |
2061 | |
2324 | |
2062 | C<$flags> can be a combination of C<IO::AIO::MAP_SHARED> or |
2325 | C<$flags> can be a combination of |
2063 | C<IO::AIO::MAP_PRIVATE>, or a number of system-specific flags (when |
2326 | C<IO::AIO::MAP_SHARED> or |
2064 | not available, the are defined as 0): C<IO::AIO::MAP_ANONYMOUS> |
2327 | C<IO::AIO::MAP_PRIVATE>, |
|
|
2328 | or a number of system-specific flags (when not available, the are C<0>): |
2065 | (which is set to C<MAP_ANON> if your system only provides this |
2329 | C<IO::AIO::MAP_ANONYMOUS> (which is set to C<MAP_ANON> if your system only provides this constant), |
2066 | constant), C<IO::AIO::MAP_HUGETLB>, C<IO::AIO::MAP_LOCKED>, |
2330 | C<IO::AIO::MAP_LOCKED>, |
2067 | C<IO::AIO::MAP_NORESERVE>, C<IO::AIO::MAP_POPULATE> or |
2331 | C<IO::AIO::MAP_NORESERVE>, |
|
|
2332 | C<IO::AIO::MAP_POPULATE>, |
2068 | C<IO::AIO::MAP_NONBLOCK> |
2333 | C<IO::AIO::MAP_NONBLOCK>, |
|
|
2334 | C<IO::AIO::MAP_FIXED>, |
|
|
2335 | C<IO::AIO::MAP_GROWSDOWN>, |
|
|
2336 | C<IO::AIO::MAP_32BIT>, |
|
|
2337 | C<IO::AIO::MAP_HUGETLB> or |
|
|
2338 | C<IO::AIO::MAP_STACK>. |
2069 | |
2339 | |
2070 | If C<$fh> is C<undef>, then a file descriptor of C<-1> is passed. |
2340 | If C<$fh> is C<undef>, then a file descriptor of C<-1> is passed. |
2071 | |
2341 | |
2072 | C<$offset> is the offset from the start of the file - it generally must be |
2342 | C<$offset> is the offset from the start of the file - it generally must be |
2073 | a multiple of C<IO::AIO::PAGESIZE> and defaults to C<0>. |
2343 | a multiple of C<IO::AIO::PAGESIZE> and defaults to C<0>. |
… | |
… | |
2086 | my $fast_md5 = md5 $data; |
2356 | my $fast_md5 = md5 $data; |
2087 | |
2357 | |
2088 | =item IO::AIO::munmap $scalar |
2358 | =item IO::AIO::munmap $scalar |
2089 | |
2359 | |
2090 | Removes a previous mmap and undefines the C<$scalar>. |
2360 | Removes a previous mmap and undefines the C<$scalar>. |
|
|
2361 | |
|
|
2362 | =item IO::AIO::mremap $scalar, $new_length, $flags = MREMAP_MAYMOVE[, $new_address = 0] |
|
|
2363 | |
|
|
2364 | Calls the Linux-specific mremap(2) system call. The C<$scalar> must have |
|
|
2365 | been mapped by C<IO::AIO::mmap>, and C<$flags> must currently either be |
|
|
2366 | C<0> or C<IO::AIO::MREMAP_MAYMOVE>. |
|
|
2367 | |
|
|
2368 | Returns true if successful, and false otherwise. If the underlying mmapped |
|
|
2369 | region has changed address, then the true value has the numerical value |
|
|
2370 | C<1>, otherwise it has the numerical value C<0>: |
|
|
2371 | |
|
|
2372 | my $success = IO::AIO::mremap $mmapped, 8192, IO::AIO::MREMAP_MAYMOVE |
|
|
2373 | or die "mremap: $!"; |
|
|
2374 | |
|
|
2375 | if ($success*1) { |
|
|
2376 | warn "scalar has chanegd address in memory\n"; |
|
|
2377 | } |
|
|
2378 | |
|
|
2379 | C<IO::AIO::MREMAP_FIXED> and the C<$new_address> argument are currently |
|
|
2380 | implemented, but not supported and might go away in a future version. |
|
|
2381 | |
|
|
2382 | On systems where this call is not supported or is not emulated, this call |
|
|
2383 | returns falls and sets C<$!> to C<ENOSYS>. |
|
|
2384 | |
|
|
2385 | =item IO::AIO::mlockall $flags |
|
|
2386 | |
|
|
2387 | Calls the C<eio_mlockall_sync> function, which is like C<aio_mlockall>, |
|
|
2388 | but is blocking. |
2091 | |
2389 | |
2092 | =item IO::AIO::munlock $scalar, $offset = 0, $length = undef |
2390 | =item IO::AIO::munlock $scalar, $offset = 0, $length = undef |
2093 | |
2391 | |
2094 | Calls the C<munlock> function, undoing the effects of a previous |
2392 | Calls the C<munlock> function, undoing the effects of a previous |
2095 | C<aio_mlock> call (see its description for details). |
2393 | C<aio_mlock> call (see its description for details). |
… | |
… | |
2145 | C<$flags> is non-zero, fails with C<ENOSYS>. |
2443 | C<$flags> is non-zero, fails with C<ENOSYS>. |
2146 | |
2444 | |
2147 | Please refer to L<pipe2(2)> for more info on the C<$flags>, but at the |
2445 | Please refer to L<pipe2(2)> for more info on the C<$flags>, but at the |
2148 | time of this writing, C<IO::AIO::O_CLOEXEC>, C<IO::AIO::O_NONBLOCK> and |
2446 | time of this writing, C<IO::AIO::O_CLOEXEC>, C<IO::AIO::O_NONBLOCK> and |
2149 | C<IO::AIO::O_DIRECT> (Linux 3.4, for packet-based pipes) were supported. |
2447 | C<IO::AIO::O_DIRECT> (Linux 3.4, for packet-based pipes) were supported. |
|
|
2448 | |
|
|
2449 | Example: create a pipe race-free w.r.t. threads and fork: |
|
|
2450 | |
|
|
2451 | my ($rfh, $wfh) = IO::AIO::pipe2 IO::AIO::O_CLOEXEC |
|
|
2452 | or die "pipe2: $!\n"; |
|
|
2453 | |
|
|
2454 | =item $fh = IO::AIO::memfd_create $pathname[, $flags] |
|
|
2455 | |
|
|
2456 | This is a direct interface to the Linux L<memfd_create(2)> system |
|
|
2457 | call. The (unhelpful) default for C<$flags> is C<0>, but your default |
|
|
2458 | should be C<IO::AIO::MFD_CLOEXEC>. |
|
|
2459 | |
|
|
2460 | On success, the new memfd filehandle is returned, otherwise returns |
|
|
2461 | C<undef>. If the memfd_create syscall is missing, fails with C<ENOSYS>. |
|
|
2462 | |
|
|
2463 | Please refer to L<memfd_create(2)> for more info on this call. |
|
|
2464 | |
|
|
2465 | The following C<$flags> values are available: C<IO::AIO::MFD_CLOEXEC>, |
|
|
2466 | C<IO::AIO::MFD_ALLOW_SEALING> and C<IO::AIO::MFD_HUGETLB>. |
|
|
2467 | |
|
|
2468 | Example: create a new memfd. |
|
|
2469 | |
|
|
2470 | my $fh = IO::AIO::memfd_create "somenameforprocfd", IO::AIO::MFD_CLOEXEC |
|
|
2471 | or die "m,emfd_create: $!\n"; |
|
|
2472 | =item $fh = IO::AIO::eventfd [$initval, [$flags]] |
|
|
2473 | |
|
|
2474 | This is a direct interface to the Linux L<eventfd(2)> system call. The |
|
|
2475 | (unhelpful) defaults for C<$initval> and C<$flags> are C<0> for both. |
|
|
2476 | |
|
|
2477 | On success, the new eventfd filehandle is returned, otherwise returns |
|
|
2478 | C<undef>. If the eventfd syscall is missing, fails with C<ENOSYS>. |
|
|
2479 | |
|
|
2480 | Please refer to L<eventfd(2)> for more info on this call. |
|
|
2481 | |
|
|
2482 | The following symbol flag values are available: C<IO::AIO::EFD_CLOEXEC>, |
|
|
2483 | C<IO::AIO::EFD_NONBLOCK> and C<IO::AIO::EFD_SEMAPHORE> (Linux 2.6.30). |
|
|
2484 | |
|
|
2485 | Example: create a new eventfd filehandle: |
|
|
2486 | |
|
|
2487 | $fh = IO::AIO::eventfd 0, IO::AIO::EFD_CLOEXEC |
|
|
2488 | or die "eventfd: $!\n"; |
|
|
2489 | |
|
|
2490 | =item $fh = IO::AIO::timerfd_create $clockid[, $flags] |
|
|
2491 | |
|
|
2492 | This is a direct interface to the Linux L<timerfd_create(2)> system |
|
|
2493 | call. The (unhelpful) default for C<$flags> is C<0>, but your default |
|
|
2494 | should be C<IO::AIO::TFD_CLOEXEC>. |
|
|
2495 | |
|
|
2496 | On success, the new timerfd filehandle is returned, otherwise returns |
|
|
2497 | C<undef>. If the timerfd_create syscall is missing, fails with C<ENOSYS>. |
|
|
2498 | |
|
|
2499 | Please refer to L<timerfd_create(2)> for more info on this call. |
|
|
2500 | |
|
|
2501 | The following C<$clockid> values are |
|
|
2502 | available: C<IO::AIO::CLOCK_REALTIME>, C<IO::AIO::CLOCK_MONOTONIC> |
|
|
2503 | C<IO::AIO::CLOCK_CLOCK_BOOTTIME> (Linux 3.15) |
|
|
2504 | C<IO::AIO::CLOCK_CLOCK_REALTIME_ALARM> (Linux 3.11) and |
|
|
2505 | C<IO::AIO::CLOCK_CLOCK_BOOTTIME_ALARM> (Linux 3.11). |
|
|
2506 | |
|
|
2507 | The following C<$flags> values are available (Linux |
|
|
2508 | 2.6.27): C<IO::AIO::TFD_NONBLOCK> and C<IO::AIO::TFD_CLOEXEC>. |
|
|
2509 | |
|
|
2510 | Example: create a new timerfd and set it to one-second repeated alarms, |
|
|
2511 | then wait for two alarms: |
|
|
2512 | |
|
|
2513 | my $fh = IO::AIO::timerfd_create IO::AIO::CLOCK_BOOTTIME, IO::AIO::TFD_CLOEXEC |
|
|
2514 | or die "timerfd_create: $!\n"; |
|
|
2515 | |
|
|
2516 | defined IO::AIO::timerfd_settime $fh, 0, 1, 1 |
|
|
2517 | or die "timerfd_settime: $!\n"; |
|
|
2518 | |
|
|
2519 | for (1..2) { |
|
|
2520 | 8 == sysread $fh, my $buf, 8 |
|
|
2521 | or die "timerfd read failure\n"; |
|
|
2522 | |
|
|
2523 | printf "number of expirations (likely 1): %d\n", |
|
|
2524 | unpack "Q", $buf; |
|
|
2525 | } |
|
|
2526 | |
|
|
2527 | =item ($cur_interval, $cur_value) = IO::AIO::timerfd_settime $fh, $flags, $new_interval, $nbw_value |
|
|
2528 | |
|
|
2529 | This is a direct interface to the Linux L<timerfd_settime(2)> system |
|
|
2530 | call. Please refer to its manpage for more info on this call. |
|
|
2531 | |
|
|
2532 | The new itimerspec is specified using two (possibly fractional) second |
|
|
2533 | values, C<$new_interval> and C<$new_value>). |
|
|
2534 | |
|
|
2535 | On success, the current interval and value are returned (as per |
|
|
2536 | C<timerfd_gettime>). On failure, the empty list is returned. |
|
|
2537 | |
|
|
2538 | The following C<$flags> values are |
|
|
2539 | available: C<IO::AIO::TFD_TIMER_ABSTIME> and |
|
|
2540 | C<IO::AIO::TFD_TIMER_CANCEL_ON_SET>. |
|
|
2541 | |
|
|
2542 | See C<IO::AIO::timerfd_create> for a full example. |
|
|
2543 | |
|
|
2544 | =item ($cur_interval, $cur_value) = IO::AIO::timerfd_gettime $fh |
|
|
2545 | |
|
|
2546 | This is a direct interface to the Linux L<timerfd_gettime(2)> system |
|
|
2547 | call. Please refer to its manpage for more info on this call. |
|
|
2548 | |
|
|
2549 | On success, returns the current values of interval and value for the given |
|
|
2550 | timerfd (as potentially fractional second values). On failure, the empty |
|
|
2551 | list is returned. |
2150 | |
2552 | |
2151 | =back |
2553 | =back |
2152 | |
2554 | |
2153 | =cut |
2555 | =cut |
2154 | |
2556 | |
… | |
… | |
2220 | the process will result in undefined behaviour. Calling it at any time |
2622 | the process will result in undefined behaviour. Calling it at any time |
2221 | will also result in any undefined (by POSIX) behaviour. |
2623 | will also result in any undefined (by POSIX) behaviour. |
2222 | |
2624 | |
2223 | =back |
2625 | =back |
2224 | |
2626 | |
|
|
2627 | =head2 LINUX-SPECIFIC CALLS |
|
|
2628 | |
|
|
2629 | When a call is documented as "linux-specific" then this means it |
|
|
2630 | originated on GNU/Linux. C<IO::AIO> will usually try to autodetect the |
|
|
2631 | availability and compatibility of such calls regardless of the platform |
|
|
2632 | it is compiled on, so platforms such as FreeBSD which often implement |
|
|
2633 | these calls will work. When in doubt, call them and see if they fail wth |
|
|
2634 | C<ENOSYS>. |
|
|
2635 | |
2225 | =head2 MEMORY USAGE |
2636 | =head2 MEMORY USAGE |
2226 | |
2637 | |
2227 | Per-request usage: |
2638 | Per-request usage: |
2228 | |
2639 | |
2229 | Each aio request uses - depending on your architecture - around 100-200 |
2640 | Each aio request uses - depending on your architecture - around 100-200 |
… | |
… | |
2241 | temporary buffers, and each thread requires a stack and other data |
2652 | temporary buffers, and each thread requires a stack and other data |
2242 | structures (usually around 16k-128k, depending on the OS). |
2653 | structures (usually around 16k-128k, depending on the OS). |
2243 | |
2654 | |
2244 | =head1 KNOWN BUGS |
2655 | =head1 KNOWN BUGS |
2245 | |
2656 | |
2246 | Known bugs will be fixed in the next release. |
2657 | Known bugs will be fixed in the next release :) |
|
|
2658 | |
|
|
2659 | =head1 KNOWN ISSUES |
|
|
2660 | |
|
|
2661 | Calls that try to "import" foreign memory areas (such as C<IO::AIO::mmap> |
|
|
2662 | or C<IO::AIO::aio_slurp>) do not work with generic lvalues, such as |
|
|
2663 | non-created hash slots or other scalars I didn't think of. It's best to |
|
|
2664 | avoid such and either use scalar variables or making sure that the scalar |
|
|
2665 | exists (e.g. by storing C<undef>) and isn't "funny" (e.g. tied). |
|
|
2666 | |
|
|
2667 | I am not sure anything can be done about this, so this is considered a |
|
|
2668 | known issue, rather than a bug. |
2247 | |
2669 | |
2248 | =head1 SEE ALSO |
2670 | =head1 SEE ALSO |
2249 | |
2671 | |
2250 | L<AnyEvent::AIO> for easy integration into event loops, L<Coro::AIO> for a |
2672 | L<AnyEvent::AIO> for easy integration into event loops, L<Coro::AIO> for a |
2251 | more natural syntax. |
2673 | more natural syntax and L<IO::FDPass> for file descriptor passing. |
2252 | |
2674 | |
2253 | =head1 AUTHOR |
2675 | =head1 AUTHOR |
2254 | |
2676 | |
2255 | Marc Lehmann <schmorp@schmorp.de> |
2677 | Marc Lehmann <schmorp@schmorp.de> |
2256 | http://home.schmorp.de/ |
2678 | http://home.schmorp.de/ |