… | |
… | |
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 = 4.41; |
176 | our $VERSION = 4.73; |
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 |
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278 | IO::AIO::idle_timeout $seconds |
278 | IO::AIO::idle_timeout $seconds |
279 | IO::AIO::max_outstanding $maxreqs |
279 | IO::AIO::max_outstanding $maxreqs |
280 | IO::AIO::nreqs |
280 | IO::AIO::nreqs |
281 | IO::AIO::nready |
281 | IO::AIO::nready |
282 | IO::AIO::npending |
282 | IO::AIO::npending |
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283 | IO::AIO::reinit |
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284 | |
283 | $nfd = IO::AIO::get_fdlimit [EXPERIMENTAL] |
285 | $nfd = IO::AIO::get_fdlimit [EXPERIMENTAL] |
284 | IO::AIO::min_fdlimit $nfd [EXPERIMENTAL] |
286 | IO::AIO::min_fdlimit $nfd [EXPERIMENTAL] |
285 | |
287 | |
286 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
288 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
287 | IO::AIO::fadvise $fh, $offset, $len, $advice |
289 | IO::AIO::fadvise $fh, $offset, $len, $advice |
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|
290 | |
288 | IO::AIO::mmap $scalar, $length, $prot, $flags[, $fh[, $offset]] |
291 | IO::AIO::mmap $scalar, $length, $prot, $flags[, $fh[, $offset]] |
289 | IO::AIO::munmap $scalar |
292 | IO::AIO::munmap $scalar |
290 | IO::AIO::mremap $scalar, $new_length, $flags[, $new_address] |
293 | IO::AIO::mremap $scalar, $new_length, $flags[, $new_address] |
291 | IO::AIO::madvise $scalar, $offset, $length, $advice |
294 | IO::AIO::madvise $scalar, $offset, $length, $advice |
292 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
295 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
293 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
296 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
294 | IO::AIO::munlockall |
297 | IO::AIO::munlockall |
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|
298 | |
|
|
299 | # stat extensions |
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|
300 | $counter = IO::AIO::st_gen |
|
|
301 | $seconds = IO::AIO::st_atime, IO::AIO::st_mtime, IO::AIO::st_ctime, IO::AIO::st_btime |
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|
302 | ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtime |
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|
303 | $nanoseconds = IO::AIO::st_atimensec, IO::AIO::st_mtimensec, IO::AIO::st_ctimensec, IO::AIO::st_btimensec |
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|
304 | $seconds = IO::AIO::st_btimesec |
|
|
305 | ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtimensec |
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|
306 | |
|
|
307 | # very much unportable syscalls |
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|
308 | IO::AIO::accept4 $r_fh, $sockaddr, $sockaddr_len, $flags |
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|
309 | IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags |
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|
310 | IO::AIO::tee $r_fh, $w_fh, $length, $flags |
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|
311 | $actual_size = IO::AIO::pipesize $r_fh[, $new_size] |
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|
312 | ($rfh, $wfh) = IO::AIO::pipe2 [$flags] |
|
|
313 | $fh = IO::AIO::memfd_create $pathname[, $flags] |
|
|
314 | $fh = IO::AIO::eventfd [$initval, [$flags]] |
|
|
315 | $fh = IO::AIO::timerfd_create $clockid[, $flags] |
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|
316 | ($cur_interval, $cur_value) = IO::AIO::timerfd_settime $fh, $flags, $new_interval, $nbw_value |
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|
317 | ($cur_interval, $cur_value) = IO::AIO::timerfd_gettime $fh |
295 | |
318 | |
296 | =head2 API NOTES |
319 | =head2 API NOTES |
297 | |
320 | |
298 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
321 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
299 | with the same name (sans C<aio_>). The arguments are similar or identical, |
322 | with the same name (sans C<aio_>). The arguments are similar or identical, |
… | |
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405 | following POSIX and non-POSIX constants are available (missing ones on |
428 | following POSIX and non-POSIX constants are available (missing ones on |
406 | your system are, as usual, C<0>): |
429 | your system are, as usual, C<0>): |
407 | |
430 | |
408 | C<O_ASYNC>, C<O_DIRECT>, C<O_NOATIME>, C<O_CLOEXEC>, C<O_NOCTTY>, C<O_NOFOLLOW>, |
431 | C<O_ASYNC>, C<O_DIRECT>, C<O_NOATIME>, C<O_CLOEXEC>, C<O_NOCTTY>, C<O_NOFOLLOW>, |
409 | C<O_NONBLOCK>, C<O_EXEC>, C<O_SEARCH>, C<O_DIRECTORY>, C<O_DSYNC>, |
432 | C<O_NONBLOCK>, C<O_EXEC>, C<O_SEARCH>, C<O_DIRECTORY>, C<O_DSYNC>, |
410 | C<O_RSYNC>, C<O_SYNC>, C<O_PATH>, C<O_TMPFILE>, and C<O_TTY_INIT>. |
433 | C<O_RSYNC>, C<O_SYNC>, C<O_PATH>, C<O_TMPFILE>, C<O_TTY_INIT> and C<O_ACCMODE>. |
411 | |
434 | |
412 | |
435 | |
413 | =item aio_close $fh, $callback->($status) |
436 | =item aio_close $fh, $callback->($status) |
414 | |
437 | |
415 | Asynchronously close a file and call the callback with the result |
438 | Asynchronously close a file and call the callback with the result |
… | |
… | |
541 | |
564 | |
542 | =item aio_stat $fh_or_path, $callback->($status) |
565 | =item aio_stat $fh_or_path, $callback->($status) |
543 | |
566 | |
544 | =item aio_lstat $fh, $callback->($status) |
567 | =item aio_lstat $fh, $callback->($status) |
545 | |
568 | |
546 | Works like perl's C<stat> or C<lstat> in void context. The callback will |
569 | Works almost exactly like perl's C<stat> or C<lstat> in void context. The |
547 | be called after the stat and the results will be available using C<stat _> |
570 | callback will be called after the stat and the results will be available |
548 | or C<-s _> etc... |
571 | using C<stat _> or C<-s _> and other tests (with the exception of C<-B> |
|
|
572 | and C<-T>). |
549 | |
573 | |
550 | The pathname passed to C<aio_stat> must be absolute. See API NOTES, above, |
574 | The pathname passed to C<aio_stat> must be absolute. See API NOTES, above, |
551 | for an explanation. |
575 | for an explanation. |
552 | |
576 | |
553 | Currently, the stats are always 64-bit-stats, i.e. instead of returning an |
577 | Currently, the stats are always 64-bit-stats, i.e. instead of returning an |
… | |
… | |
560 | behaviour). |
584 | behaviour). |
561 | |
585 | |
562 | C<S_IFMT>, C<S_IFIFO>, C<S_IFCHR>, C<S_IFBLK>, C<S_IFLNK>, C<S_IFREG>, |
586 | C<S_IFMT>, C<S_IFIFO>, C<S_IFCHR>, C<S_IFBLK>, C<S_IFLNK>, C<S_IFREG>, |
563 | C<S_IFDIR>, C<S_IFWHT>, C<S_IFSOCK>, C<IO::AIO::major $dev_t>, |
587 | C<S_IFDIR>, C<S_IFWHT>, C<S_IFSOCK>, C<IO::AIO::major $dev_t>, |
564 | C<IO::AIO::minor $dev_t>, C<IO::AIO::makedev $major, $minor>. |
588 | C<IO::AIO::minor $dev_t>, C<IO::AIO::makedev $major, $minor>. |
|
|
589 | |
|
|
590 | To access higher resolution stat timestamps, see L<SUBSECOND STAT TIME |
|
|
591 | ACCESS>. |
565 | |
592 | |
566 | Example: Print the length of F</etc/passwd>: |
593 | Example: Print the length of F</etc/passwd>: |
567 | |
594 | |
568 | aio_stat "/etc/passwd", sub { |
595 | aio_stat "/etc/passwd", sub { |
569 | $_[0] and die "stat failed: $!"; |
596 | $_[0] and die "stat failed: $!"; |
… | |
… | |
619 | |
646 | |
620 | Works like perl's C<utime> function (including the special case of $atime |
647 | Works like perl's C<utime> function (including the special case of $atime |
621 | and $mtime being undef). Fractional times are supported if the underlying |
648 | and $mtime being undef). Fractional times are supported if the underlying |
622 | syscalls support them. |
649 | syscalls support them. |
623 | |
650 | |
624 | When called with a pathname, uses utimes(2) if available, otherwise |
651 | When called with a pathname, uses utimensat(2) or utimes(2) if available, |
625 | utime(2). If called on a file descriptor, uses futimes(2) if available, |
652 | otherwise utime(2). If called on a file descriptor, uses futimens(2) |
626 | otherwise returns ENOSYS, so this is not portable. |
653 | or futimes(2) if available, otherwise returns ENOSYS, so this is not |
|
|
654 | portable. |
627 | |
655 | |
628 | Examples: |
656 | Examples: |
629 | |
657 | |
630 | # set atime and mtime to current time (basically touch(1)): |
658 | # set atime and mtime to current time (basically touch(1)): |
631 | aio_utime "path", undef, undef; |
659 | aio_utime "path", undef, undef; |
… | |
… | |
1104 | aioreq_pri $pri; |
1132 | aioreq_pri $pri; |
1105 | add $grp aio_stat $wd, sub { |
1133 | add $grp aio_stat $wd, sub { |
1106 | return $grp->result () if $_[0]; |
1134 | return $grp->result () if $_[0]; |
1107 | my $now = time; |
1135 | my $now = time; |
1108 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
1136 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
|
|
1137 | my $rdxflags = READDIR_DIRS_FIRST; |
|
|
1138 | |
|
|
1139 | if ((stat _)[3] < 2) { |
|
|
1140 | # at least one non-POSIX filesystem exists |
|
|
1141 | # that returns useful DT_type values: btrfs, |
|
|
1142 | # so optimise for this here by requesting dents |
|
|
1143 | $rdxflags |= READDIR_DENTS; |
|
|
1144 | } |
1109 | |
1145 | |
1110 | # read the directory entries |
1146 | # read the directory entries |
1111 | aioreq_pri $pri; |
1147 | aioreq_pri $pri; |
1112 | add $grp aio_readdirx $wd, READDIR_DIRS_FIRST, sub { |
1148 | add $grp aio_readdirx $wd, $rdxflags, sub { |
1113 | my $entries = shift |
1149 | my ($entries, $flags) = @_ |
1114 | or return $grp->result (); |
1150 | or return $grp->result (); |
|
|
1151 | |
|
|
1152 | if ($rdxflags & READDIR_DENTS) { |
|
|
1153 | # if we requested type values, see if we can use them directly. |
|
|
1154 | |
|
|
1155 | # if there were any DT_UNKNOWN entries then we assume we |
|
|
1156 | # don't know. alternatively, we could assume that if we get |
|
|
1157 | # one DT_DIR, then all directories are indeed marked with |
|
|
1158 | # DT_DIR, but this seems not required for btrfs, and this |
|
|
1159 | # is basically the "btrfs can't get it's act together" code |
|
|
1160 | # branch. |
|
|
1161 | unless ($flags & READDIR_FOUND_UNKNOWN) { |
|
|
1162 | # now we have valid DT_ information for all entries, |
|
|
1163 | # so use it as an optimisation without further stat's. |
|
|
1164 | # they must also all be at the beginning of @$entries |
|
|
1165 | # by now. |
|
|
1166 | |
|
|
1167 | my $dirs; |
|
|
1168 | |
|
|
1169 | if (@$entries) { |
|
|
1170 | for (0 .. $#$entries) { |
|
|
1171 | if ($entries->[$_][1] != DT_DIR) { |
|
|
1172 | # splice out directories |
|
|
1173 | $dirs = [splice @$entries, 0, $_]; |
|
|
1174 | last; |
|
|
1175 | } |
|
|
1176 | } |
|
|
1177 | |
|
|
1178 | # if we didn't find any non-dir, then all entries are dirs |
|
|
1179 | unless ($dirs) { |
|
|
1180 | ($dirs, $entries) = ($entries, []); |
|
|
1181 | } |
|
|
1182 | } else { |
|
|
1183 | # directory is empty, so there are no sbdirs |
|
|
1184 | $dirs = []; |
|
|
1185 | } |
|
|
1186 | |
|
|
1187 | # either splice'd the directories out or the dir was empty. |
|
|
1188 | # convert dents to filenames |
|
|
1189 | $_ = $_->[0] for @$dirs; |
|
|
1190 | $_ = $_->[0] for @$entries; |
|
|
1191 | |
|
|
1192 | return $grp->result ($dirs, $entries); |
|
|
1193 | } |
|
|
1194 | |
|
|
1195 | # cannot use, so return to our old ways |
|
|
1196 | # by pretending we only scanned for names. |
|
|
1197 | $_ = $_->[0] for @$entries; |
|
|
1198 | } |
1115 | |
1199 | |
1116 | # stat the dir another time |
1200 | # stat the dir another time |
1117 | aioreq_pri $pri; |
1201 | aioreq_pri $pri; |
1118 | add $grp aio_stat $wd, sub { |
1202 | add $grp aio_stat $wd, sub { |
1119 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
1203 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
… | |
… | |
1225 | So in general, you should only use these calls for things that do |
1309 | So in general, you should only use these calls for things that do |
1226 | (filesystem) I/O, not for things that wait for other events (network, |
1310 | (filesystem) I/O, not for things that wait for other events (network, |
1227 | other processes), although if you are careful and know what you are doing, |
1311 | other processes), although if you are careful and know what you are doing, |
1228 | you still can. |
1312 | you still can. |
1229 | |
1313 | |
1230 | The following constants are available (missing ones are, as usual C<0>): |
1314 | The following constants are available and can be used for normal C<ioctl> |
|
|
1315 | and C<fcntl> as well (missing ones are, as usual C<0>): |
1231 | |
1316 | |
1232 | C<F_DUPFD_CLOEXEC>, |
1317 | C<F_DUPFD_CLOEXEC>, |
1233 | |
1318 | |
1234 | C<F_OFD_GETLK>, C<F_OFD_SETLK>, C<F_OFD_GETLKW>, |
1319 | C<F_OFD_GETLK>, C<F_OFD_SETLK>, C<F_OFD_GETLKW>, |
1235 | |
1320 | |
1236 | C<FIFREEZE>, C<FITHAW>, C<FITRIM>, C<FICLONE>, C<FICLONERANGE>, C<FIDEDUPERANGE>. |
1321 | C<FIFREEZE>, C<FITHAW>, C<FITRIM>, C<FICLONE>, C<FICLONERANGE>, C<FIDEDUPERANGE>. |
|
|
1322 | |
|
|
1323 | C<F_ADD_SEALS>, C<F_GET_SEALS>, C<F_SEAL_SEAL>, C<F_SEAL_SHRINK>, C<F_SEAL_GROW> and |
|
|
1324 | C<F_SEAL_WRITE>. |
1237 | |
1325 | |
1238 | C<FS_IOC_GETFLAGS>, C<FS_IOC_SETFLAGS>, C<FS_IOC_GETVERSION>, C<FS_IOC_SETVERSION>, |
1326 | C<FS_IOC_GETFLAGS>, C<FS_IOC_SETFLAGS>, C<FS_IOC_GETVERSION>, C<FS_IOC_SETVERSION>, |
1239 | C<FS_IOC_FIEMAP>. |
1327 | C<FS_IOC_FIEMAP>. |
1240 | |
1328 | |
1241 | C<FS_IOC_FSGETXATTR>, C<FS_IOC_FSSETXATTR>, C<FS_IOC_SET_ENCRYPTION_POLICY>, |
1329 | C<FS_IOC_FSGETXATTR>, C<FS_IOC_FSSETXATTR>, C<FS_IOC_SET_ENCRYPTION_POLICY>, |
… | |
… | |
1380 | IO::AIO::mmap $data, -s $fh, IO::AIO::PROT_READ, IO::AIO::MAP_SHARED, $fh; |
1468 | IO::AIO::mmap $data, -s $fh, IO::AIO::PROT_READ, IO::AIO::MAP_SHARED, $fh; |
1381 | aio_mlock $data; # mlock in background |
1469 | aio_mlock $data; # mlock in background |
1382 | |
1470 | |
1383 | =item aio_mlockall $flags, $callback->($status) |
1471 | =item aio_mlockall $flags, $callback->($status) |
1384 | |
1472 | |
1385 | Calls the C<mlockall> function with the given C<$flags> (a combination of |
1473 | Calls the C<mlockall> function with the given C<$flags> (a |
1386 | C<IO::AIO::MCL_CURRENT> and C<IO::AIO::MCL_FUTURE>). |
1474 | combination of C<IO::AIO::MCL_CURRENT>, C<IO::AIO::MCL_FUTURE> and |
|
|
1475 | C<IO::AIO::MCL_ONFAULT>). |
1387 | |
1476 | |
1388 | On systems that do not implement C<mlockall>, this function returns C<-1> |
1477 | On systems that do not implement C<mlockall>, this function returns C<-1> |
1389 | and sets errno to C<ENOSYS>. |
1478 | and sets errno to C<ENOSYS>. Similarly, flag combinations not supported |
|
|
1479 | by the system result in a return value of C<-1> with errno being set to |
|
|
1480 | C<EINVAL>. |
1390 | |
1481 | |
1391 | Note that the corresponding C<munlockall> is synchronous and is |
1482 | Note that the corresponding C<munlockall> is synchronous and is |
1392 | documented under L<MISCELLANEOUS FUNCTIONS>. |
1483 | documented under L<MISCELLANEOUS FUNCTIONS>. |
1393 | |
1484 | |
1394 | Example: asynchronously lock all current and future pages into memory. |
1485 | Example: asynchronously lock all current and future pages into memory. |
… | |
… | |
1588 | C<aio_wd> callback, as future requests using the value will fail in the |
1679 | C<aio_wd> callback, as future requests using the value will fail in the |
1589 | expected way. |
1680 | expected way. |
1590 | |
1681 | |
1591 | =item IO::AIO::CWD |
1682 | =item IO::AIO::CWD |
1592 | |
1683 | |
1593 | This is a compiletime constant (object) that represents the process |
1684 | This is a compile time constant (object) that represents the process |
1594 | current working directory. |
1685 | current working directory. |
1595 | |
1686 | |
1596 | Specifying this object as working directory object for a pathname is as if |
1687 | Specifying this object as working directory object for a pathname is as if |
1597 | the pathname would be specified directly, without a directory object. For |
1688 | the pathname would be specified directly, without a directory object. For |
1598 | example, these calls are functionally identical: |
1689 | example, these calls are functionally identical: |
… | |
… | |
1779 | The default value for the limit is C<0>, but note that setting a feeder |
1870 | The default value for the limit is C<0>, but note that setting a feeder |
1780 | automatically bumps it up to C<2>. |
1871 | automatically bumps it up to C<2>. |
1781 | |
1872 | |
1782 | =back |
1873 | =back |
1783 | |
1874 | |
|
|
1875 | |
1784 | =head2 SUPPORT FUNCTIONS |
1876 | =head2 SUPPORT FUNCTIONS |
1785 | |
1877 | |
1786 | =head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION |
1878 | =head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION |
1787 | |
1879 | |
1788 | =over 4 |
1880 | =over 4 |
… | |
… | |
1853 | Strictly equivalent to: |
1945 | Strictly equivalent to: |
1854 | |
1946 | |
1855 | IO::AIO::poll_wait, IO::AIO::poll_cb |
1947 | IO::AIO::poll_wait, IO::AIO::poll_cb |
1856 | while IO::AIO::nreqs; |
1948 | while IO::AIO::nreqs; |
1857 | |
1949 | |
|
|
1950 | This function can be useful at program aborts, to make sure outstanding |
|
|
1951 | I/O has been done (C<IO::AIO> uses an C<END> block which already calls |
|
|
1952 | this function on normal exits), or when you are merely using C<IO::AIO> |
|
|
1953 | for its more advanced functions, rather than for async I/O, e.g.: |
|
|
1954 | |
|
|
1955 | my ($dirs, $nondirs); |
|
|
1956 | IO::AIO::aio_scandir "/tmp", 0, sub { ($dirs, $nondirs) = @_ }; |
|
|
1957 | IO::AIO::flush; |
|
|
1958 | # $dirs, $nondirs are now set |
|
|
1959 | |
1858 | =item IO::AIO::max_poll_reqs $nreqs |
1960 | =item IO::AIO::max_poll_reqs $nreqs |
1859 | |
1961 | |
1860 | =item IO::AIO::max_poll_time $seconds |
1962 | =item IO::AIO::max_poll_time $seconds |
1861 | |
1963 | |
1862 | These set the maximum number of requests (default C<0>, meaning infinity) |
1964 | These set the maximum number of requests (default C<0>, meaning infinity) |
… | |
… | |
1888 | poll => 'r', nice => 1, |
1990 | poll => 'r', nice => 1, |
1889 | cb => &IO::AIO::poll_cb); |
1991 | cb => &IO::AIO::poll_cb); |
1890 | |
1992 | |
1891 | =back |
1993 | =back |
1892 | |
1994 | |
|
|
1995 | |
1893 | =head3 CONTROLLING THE NUMBER OF THREADS |
1996 | =head3 CONTROLLING THE NUMBER OF THREADS |
1894 | |
1997 | |
1895 | =over |
1998 | =over |
1896 | |
1999 | |
1897 | =item IO::AIO::min_parallel $nthreads |
2000 | =item IO::AIO::min_parallel $nthreads |
… | |
… | |
1984 | The default value for C<max_outstanding> is very large, so there is no |
2087 | The default value for C<max_outstanding> is very large, so there is no |
1985 | practical limit on the number of outstanding requests. |
2088 | practical limit on the number of outstanding requests. |
1986 | |
2089 | |
1987 | =back |
2090 | =back |
1988 | |
2091 | |
|
|
2092 | |
1989 | =head3 STATISTICAL INFORMATION |
2093 | =head3 STATISTICAL INFORMATION |
1990 | |
2094 | |
1991 | =over |
2095 | =over |
1992 | |
2096 | |
1993 | =item IO::AIO::nreqs |
2097 | =item IO::AIO::nreqs |
… | |
… | |
2009 | |
2113 | |
2010 | Returns the number of requests currently in the pending state (executed, |
2114 | Returns the number of requests currently in the pending state (executed, |
2011 | but not yet processed by poll_cb). |
2115 | but not yet processed by poll_cb). |
2012 | |
2116 | |
2013 | =back |
2117 | =back |
|
|
2118 | |
|
|
2119 | |
|
|
2120 | =head3 SUBSECOND STAT TIME ACCESS |
|
|
2121 | |
|
|
2122 | Both C<aio_stat>/C<aio_lstat> and perl's C<stat>/C<lstat> functions can |
|
|
2123 | generally find access/modification and change times with subsecond time |
|
|
2124 | accuracy of the system supports it, but perl's built-in functions only |
|
|
2125 | return the integer part. |
|
|
2126 | |
|
|
2127 | The following functions return the timestamps of the most recent |
|
|
2128 | stat with subsecond precision on most systems and work both after |
|
|
2129 | C<aio_stat>/C<aio_lstat> and perl's C<stat>/C<lstat> calls. Their return |
|
|
2130 | value is only meaningful after a successful C<stat>/C<lstat> call, or |
|
|
2131 | during/after a successful C<aio_stat>/C<aio_lstat> callback. |
|
|
2132 | |
|
|
2133 | This is similar to the L<Time::HiRes> C<stat> functions, but can return |
|
|
2134 | full resolution without rounding and work with standard perl C<stat>, |
|
|
2135 | alleviating the need to call the special C<Time::HiRes> functions, which |
|
|
2136 | do not act like their perl counterparts. |
|
|
2137 | |
|
|
2138 | On operating systems or file systems where subsecond time resolution is |
|
|
2139 | not supported or could not be detected, a fractional part of C<0> is |
|
|
2140 | returned, so it is always safe to call these functions. |
|
|
2141 | |
|
|
2142 | =over 4 |
|
|
2143 | |
|
|
2144 | =item $seconds = IO::AIO::st_atime, IO::AIO::st_mtime, IO::AIO::st_ctime, IO::AIO::st_btime |
|
|
2145 | |
|
|
2146 | Return the access, modication, change or birth time, respectively, |
|
|
2147 | including fractional part. Due to the limited precision of floating point, |
|
|
2148 | the accuracy on most platforms is only a bit better than milliseconds |
|
|
2149 | for times around now - see the I<nsec> function family, below, for full |
|
|
2150 | accuracy. |
|
|
2151 | |
|
|
2152 | File birth time is only available when the OS and perl support it (on |
|
|
2153 | FreeBSD and NetBSD at the time of this writing, although support is |
|
|
2154 | adaptive, so if your OS/perl gains support, IO::AIO can take advantage of |
|
|
2155 | it). On systems where it isn't available, C<0> is currently returned, but |
|
|
2156 | this might change to C<undef> in a future version. |
|
|
2157 | |
|
|
2158 | =item ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtime |
|
|
2159 | |
|
|
2160 | Returns access, modification, change and birth time all in one go, and |
|
|
2161 | maybe more times in the future version. |
|
|
2162 | |
|
|
2163 | =item $nanoseconds = IO::AIO::st_atimensec, IO::AIO::st_mtimensec, IO::AIO::st_ctimensec, IO::AIO::st_btimensec |
|
|
2164 | |
|
|
2165 | Return the fractional access, modifcation, change or birth time, in nanoseconds, |
|
|
2166 | as an integer in the range C<0> to C<999999999>. |
|
|
2167 | |
|
|
2168 | Note that no accessors are provided for access, modification and |
|
|
2169 | change times - you need to get those from C<stat _> if required (C<int |
|
|
2170 | IO::AIO::st_atime> and so on will I<not> generally give you the correct |
|
|
2171 | value). |
|
|
2172 | |
|
|
2173 | =item $seconds = IO::AIO::st_btimesec |
|
|
2174 | |
|
|
2175 | The (integral) seconds part of the file birth time, if available. |
|
|
2176 | |
|
|
2177 | =item ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtimensec |
|
|
2178 | |
|
|
2179 | Like the functions above, but returns all four times in one go (and maybe |
|
|
2180 | more in future versions). |
|
|
2181 | |
|
|
2182 | =item $counter = IO::AIO::st_gen |
|
|
2183 | |
|
|
2184 | Returns the generation counter (in practice this is just a random number) |
|
|
2185 | of the file. This is only available on platforms which have this member in |
|
|
2186 | their C<struct stat> (most BSDs at the time of this writing) and generally |
|
|
2187 | only to the root usert. If unsupported, C<0> is returned, but this might |
|
|
2188 | change to C<undef> in a future version. |
|
|
2189 | |
|
|
2190 | =back |
|
|
2191 | |
|
|
2192 | Example: print the high resolution modification time of F</etc>, using |
|
|
2193 | C<stat>, and C<IO::AIO::aio_stat>. |
|
|
2194 | |
|
|
2195 | if (stat "/etc") { |
|
|
2196 | printf "stat(/etc) mtime: %f\n", IO::AIO::st_mtime; |
|
|
2197 | } |
|
|
2198 | |
|
|
2199 | IO::AIO::aio_stat "/etc", sub { |
|
|
2200 | $_[0] |
|
|
2201 | and return; |
|
|
2202 | |
|
|
2203 | printf "aio_stat(/etc) mtime: %d.%09d\n", (stat _)[9], IO::AIO::st_mtimensec; |
|
|
2204 | }; |
|
|
2205 | |
|
|
2206 | IO::AIO::flush; |
|
|
2207 | |
|
|
2208 | Output of the awbove on my system, showing reduced and full accuracy: |
|
|
2209 | |
|
|
2210 | stat(/etc) mtime: 1534043702.020808 |
|
|
2211 | aio_stat(/etc) mtime: 1534043702.020807792 |
|
|
2212 | |
2014 | |
2213 | |
2015 | =head3 MISCELLANEOUS FUNCTIONS |
2214 | =head3 MISCELLANEOUS FUNCTIONS |
2016 | |
2215 | |
2017 | IO::AIO implements some functions that are useful when you want to use |
2216 | IO::AIO implements some functions that are useful when you want to use |
2018 | some "Advanced I/O" function not available to in Perl, without going the |
2217 | some "Advanced I/O" function not available to in Perl, without going the |
… | |
… | |
2159 | |
2358 | |
2160 | =item IO::AIO::munmap $scalar |
2359 | =item IO::AIO::munmap $scalar |
2161 | |
2360 | |
2162 | Removes a previous mmap and undefines the C<$scalar>. |
2361 | Removes a previous mmap and undefines the C<$scalar>. |
2163 | |
2362 | |
2164 | =item IO::AIO::mremap $scalar, $new_length, $flags = 0[, $new_address = 0] |
2363 | =item IO::AIO::mremap $scalar, $new_length, $flags = MREMAP_MAYMOVE[, $new_address = 0] |
2165 | |
2364 | |
2166 | Calls the Linux-specific mremap(2) system call. The C<$scalar> must have |
2365 | Calls the Linux-specific mremap(2) system call. The C<$scalar> must have |
2167 | been mapped by C<IO::AIO::mmap>, and C<$flags> must currently either be |
2366 | been mapped by C<IO::AIO::mmap>, and C<$flags> must currently either be |
2168 | C<0> or C<IO::AIO::MREMAP_MAYMOVE>. |
2367 | C<0> or C<IO::AIO::MREMAP_MAYMOVE>. |
2169 | |
2368 | |
… | |
… | |
2182 | implemented, but not supported and might go away in a future version. |
2381 | implemented, but not supported and might go away in a future version. |
2183 | |
2382 | |
2184 | On systems where this call is not supported or is not emulated, this call |
2383 | On systems where this call is not supported or is not emulated, this call |
2185 | returns falls and sets C<$!> to C<ENOSYS>. |
2384 | returns falls and sets C<$!> to C<ENOSYS>. |
2186 | |
2385 | |
|
|
2386 | =item IO::AIO::mlockall $flags |
|
|
2387 | |
|
|
2388 | Calls the C<eio_mlockall_sync> function, which is like C<aio_mlockall>, |
|
|
2389 | but is blocking. |
|
|
2390 | |
2187 | =item IO::AIO::munlock $scalar, $offset = 0, $length = undef |
2391 | =item IO::AIO::munlock $scalar, $offset = 0, $length = undef |
2188 | |
2392 | |
2189 | Calls the C<munlock> function, undoing the effects of a previous |
2393 | Calls the C<munlock> function, undoing the effects of a previous |
2190 | C<aio_mlock> call (see its description for details). |
2394 | C<aio_mlock> call (see its description for details). |
2191 | |
2395 | |
… | |
… | |
2193 | |
2397 | |
2194 | Calls the C<munlockall> function. |
2398 | Calls the C<munlockall> function. |
2195 | |
2399 | |
2196 | On systems that do not implement C<munlockall>, this function returns |
2400 | On systems that do not implement C<munlockall>, this function returns |
2197 | ENOSYS, otherwise the return value of C<munlockall>. |
2401 | ENOSYS, otherwise the return value of C<munlockall>. |
|
|
2402 | |
|
|
2403 | =item $fh = IO::AIO::accept4 $r_fh, $sockaddr, $sockaddr_maxlen, $flags |
|
|
2404 | |
|
|
2405 | Uses the GNU/Linux C<accept4(2)> syscall, if available, to accept a socket |
|
|
2406 | and return the new file handle on success, or sets C<$!> and returns |
|
|
2407 | C<undef> on error. |
|
|
2408 | |
|
|
2409 | The remote name of the new socket will be stored in C<$sockaddr>, which |
|
|
2410 | will be extended to allow for at least C<$sockaddr_maxlen> octets. If the |
|
|
2411 | socket name does not fit into C<$sockaddr_maxlen> octets, this is signaled |
|
|
2412 | by returning a longer string in C<$sockaddr>, which might or might not be |
|
|
2413 | truncated. |
|
|
2414 | |
|
|
2415 | To accept name-less sockets, use C<undef> for C<$sockaddr> and C<0> for |
|
|
2416 | C<$sockaddr_maxlen>. |
|
|
2417 | |
|
|
2418 | The main reasons to use this syscall rather than portable C«accept(2)> |
|
|
2419 | are that you can specify C<SOCK_NONBLOCK> and/or C<SOCK_CLOEXEC> |
|
|
2420 | flags and you can accept name-less sockets by specifying C<0> for |
|
|
2421 | C<$sockaddr_maxlen>, which is sadly not possible with perl's interface to |
|
|
2422 | C<accept>. |
2198 | |
2423 | |
2199 | =item IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags |
2424 | =item IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags |
2200 | |
2425 | |
2201 | Calls the GNU/Linux C<splice(2)> syscall, if available. If C<$r_off> or |
2426 | Calls the GNU/Linux C<splice(2)> syscall, if available. If C<$r_off> or |
2202 | C<$w_off> are C<undef>, then C<NULL> is passed for these, otherwise they |
2427 | C<$w_off> are C<undef>, then C<NULL> is passed for these, otherwise they |
… | |
… | |
2246 | Example: create a pipe race-free w.r.t. threads and fork: |
2471 | Example: create a pipe race-free w.r.t. threads and fork: |
2247 | |
2472 | |
2248 | my ($rfh, $wfh) = IO::AIO::pipe2 IO::AIO::O_CLOEXEC |
2473 | my ($rfh, $wfh) = IO::AIO::pipe2 IO::AIO::O_CLOEXEC |
2249 | or die "pipe2: $!\n"; |
2474 | or die "pipe2: $!\n"; |
2250 | |
2475 | |
|
|
2476 | =item $fh = IO::AIO::memfd_create $pathname[, $flags] |
|
|
2477 | |
|
|
2478 | This is a direct interface to the Linux L<memfd_create(2)> system |
|
|
2479 | call. The (unhelpful) default for C<$flags> is C<0>, but your default |
|
|
2480 | should be C<IO::AIO::MFD_CLOEXEC>. |
|
|
2481 | |
|
|
2482 | On success, the new memfd filehandle is returned, otherwise returns |
|
|
2483 | C<undef>. If the memfd_create syscall is missing, fails with C<ENOSYS>. |
|
|
2484 | |
|
|
2485 | Please refer to L<memfd_create(2)> for more info on this call. |
|
|
2486 | |
|
|
2487 | The following C<$flags> values are available: C<IO::AIO::MFD_CLOEXEC>, |
|
|
2488 | C<IO::AIO::MFD_ALLOW_SEALING> and C<IO::AIO::MFD_HUGETLB>. |
|
|
2489 | |
|
|
2490 | Example: create a new memfd. |
|
|
2491 | |
|
|
2492 | my $fh = IO::AIO::memfd_create "somenameforprocfd", IO::AIO::MFD_CLOEXEC |
|
|
2493 | or die "m,emfd_create: $!\n"; |
2251 | =item $fh = IO::AIO::eventfd [$initval, [$flags]] |
2494 | =item $fh = IO::AIO::eventfd [$initval, [$flags]] |
2252 | |
2495 | |
2253 | This is a direct interface to the Linux L<eventfd(2)> system call. The |
2496 | This is a direct interface to the Linux L<eventfd(2)> system call. The |
2254 | (unhelpful) defaults for C<$initval> and C<$flags> are C<0> for both. |
2497 | (unhelpful) defaults for C<$initval> and C<$flags> are C<0> for both. |
2255 | |
2498 | |
… | |
… | |
2261 | The following symbol flag values are available: C<IO::AIO::EFD_CLOEXEC>, |
2504 | The following symbol flag values are available: C<IO::AIO::EFD_CLOEXEC>, |
2262 | C<IO::AIO::EFD_NONBLOCK> and C<IO::AIO::EFD_SEMAPHORE> (Linux 2.6.30). |
2505 | C<IO::AIO::EFD_NONBLOCK> and C<IO::AIO::EFD_SEMAPHORE> (Linux 2.6.30). |
2263 | |
2506 | |
2264 | Example: create a new eventfd filehandle: |
2507 | Example: create a new eventfd filehandle: |
2265 | |
2508 | |
2266 | $fh = IO::AIO::eventfd 0, IO::AIO::O_CLOEXEC |
2509 | $fh = IO::AIO::eventfd 0, IO::AIO::EFD_CLOEXEC |
2267 | or die "eventfd: $!\n"; |
2510 | or die "eventfd: $!\n"; |
2268 | |
2511 | |
2269 | =item $fh = IO::AIO::timerfd_create $clockid[, $flags] |
2512 | =item $fh = IO::AIO::timerfd_create $clockid[, $flags] |
2270 | |
2513 | |
2271 | This is a direct interface to the Linux L<timerfd_create(2)> system call. The |
2514 | This is a direct interface to the Linux L<timerfd_create(2)> system |
2272 | (unhelpful) default for C<$flags> is C<0>. |
2515 | call. The (unhelpful) default for C<$flags> is C<0>, but your default |
|
|
2516 | should be C<IO::AIO::TFD_CLOEXEC>. |
2273 | |
2517 | |
2274 | On success, the new timerfd filehandle is returned, otherwise returns |
2518 | On success, the new timerfd filehandle is returned, otherwise returns |
2275 | C<undef>. If the eventfd syscall is missing, fails with C<ENOSYS>. |
2519 | C<undef>. If the timerfd_create syscall is missing, fails with C<ENOSYS>. |
2276 | |
2520 | |
2277 | Please refer to L<timerfd_create(2)> for more info on this call. |
2521 | Please refer to L<timerfd_create(2)> for more info on this call. |
2278 | |
2522 | |
2279 | The following C<$clockid> values are |
2523 | The following C<$clockid> values are |
2280 | available: C<IO::AIO::CLOCK_REALTIME>, C<IO::AIO::CLOCK_MONOTONIC> |
2524 | available: C<IO::AIO::CLOCK_REALTIME>, C<IO::AIO::CLOCK_MONOTONIC> |
… | |
… | |
2446 | known issue, rather than a bug. |
2690 | known issue, rather than a bug. |
2447 | |
2691 | |
2448 | =head1 SEE ALSO |
2692 | =head1 SEE ALSO |
2449 | |
2693 | |
2450 | L<AnyEvent::AIO> for easy integration into event loops, L<Coro::AIO> for a |
2694 | L<AnyEvent::AIO> for easy integration into event loops, L<Coro::AIO> for a |
2451 | more natural syntax. |
2695 | more natural syntax and L<IO::FDPass> for file descriptor passing. |
2452 | |
2696 | |
2453 | =head1 AUTHOR |
2697 | =head1 AUTHOR |
2454 | |
2698 | |
2455 | Marc Lehmann <schmorp@schmorp.de> |
2699 | Marc Lehmann <schmorp@schmorp.de> |
2456 | http://home.schmorp.de/ |
2700 | http://home.schmorp.de/ |