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Comparing IO-AIO/Changes (file contents):
Revision 1.134 by root, Sun Dec 2 20:54:33 2007 UTC vs.
Revision 1.362 by root, Sun Aug 12 06:03:20 2018 UTC

1Revision history for IO::AIO 1Revision history for IO::AIO
2 2
3TODO: better autoconf.pm that can return LIBS etc. 3TODO: scandir - some dirs mostly contain subdirs - invert logic?
4TODO: aio_cptree/mvtree 4TODO: aio_cptree/mvtree
5TODO: reduce condvar fairness: schedule hot-cache-threads first?
6TODO: fix setsig
7TODO: splice/tee/vmsplice/sync_file_range? (http://kerneltrap.org/node/6505 http://lwn.net/Articles/178199/) 5TODO: vmsplice? (http://kerneltrap.org/node/6505 http://lwn.net/Articles/178199/)
6TODO: getxattr, setxattr, listxattr, removexattr etc.?
7TODO: emulation for splice?
8TODO: syncfs/sync windows:
9TODO: posix_fallocate when flags=0
10http://stackoverflow.com/questions/65170/how-to-get-name-associated-with-open-handle/5286888#5286888
11http://blogs.msdn.com/b/adioltean/archive/2005/04/16/408947.aspx
12http://msdn.microsoft.com/en-us/library/aa366789%28v=vs.85%29.aspx
13http://msdn.microsoft.com/en-us/library/windows/desktop/aa366789%28v=vs.85%29.aspx
14http://msdn.microsoft.com/en-us/library/windows/desktop/aa364425%28v=vs.85%29.aspx
15http://msdn.microsoft.com/en-us/library/windows/desktop/aa364963%28v=vs.85%29.aspx
16http://msdn.microsoft.com/en-us/library/windows/desktop/aa364996%28v=vs.85%29.aspx
17http://msdn.microsoft.com/en-us/library/windows/desktop/aa364994%28v=vs.85%29.aspx
18TODO: extra socket/tcp constants &c?
19TODO: http://lwn.net/Articles/593918/ SHMEM_SET_SEALS, SHMEM_GET_SEALS, SEAL_SHRINK, SEAL_GROW, SEAL_WRITE, int memfd_create(const char *name, u64 size, u64 flags);, MFD_CLOEXEC, int fd = open("/tmp", O_RDWR | O_TMPFILE | O_EXCL, S_IRWXU);
20TODO: name_to_handle_At + open_by_handle_at = clone fds
21TODO: lchown
22TODO: mount/umount2/MS_* flags
8 23
92.6 24TODO: rewrite rmtree et al. to support working directories (also speed them up)
25TODO: maybe IO::AIO leaks fds when requests are cancelled? maybe initialise result to -1?
26TODO: aio_wd should use O_PATH on linux, due to lacking O_SEARCH (http://comments.gmane.org/gmane.linux.file-systems/33611)
27 http://www.openwall.com/lists/musl/2013/02/23/4
28TODO: maybe copy some hacks from PerlIOStdio_invalidate_fileno for faster close on certain platforms
29TODO: copy_file_range, copy_file_range
30TODO: FIDEDUPERANGE, file_ioctl.c
31TODO: mincore
32TODO: SOCK_CLOEXEc etc.
33TODO: unlinkat flags, linkat flags, statat, renameat2 flags
34TODO: https://kernelnewbies.org/Linux_4.11
35TODO: define useful rules for [[$wd, $path], $path] &c and implement them
36TODO: https://github.com/coreutils/coreutils/blob/master/src/stat.c maybe IO::AIO::FSID
37TODO: mlock2, MLOCK_ONFAULT
38TODO: dup3, pipe2, accept4
39
404.51 Sun Aug 12 07:24:14 CEST 2018
41 - complete rework of the autoconf framework: IO::AIO now uses its own
42 config.h, separate from libeio, and tries to test the actual perl
43 environment, not the standard system environment.
44 - provide nanosecond-accracy stat time accessors for both perl and IO::AIO
45 stat functions.
46 - removed non-portable C++ syntax from eio.c.
47 - try to fix readdir tests on cygwin spuriously failing.
48
494.5 Wed Aug 1 00:23:55 CEST 2018
50 - aio_mtouch touch all pages as requested, not just the first page in most cases.
51 - new function: IO::AIO::mremap, linux-specific mremap, with constants MREMAP_MAYMOVE
52 and MREMAP_FIXED.
53 - add O_ACCMODE.
54 - add (undocumented) MSG_CMSG_CLOEXEC and SOCK_CLOEXEC constants.
55
564.4 Tue Feb 20 07:54:12 CET 2018
57 - new aio_slurp request.
58 - add (experimental) IO::AIO::eventfd and timerfd* function.
59 - add (experimental) IO::AIO::get_fdlimit and IO::AIO::min_fdlimit.
60 - point out that aio_copy overwrites existing files.
61 - removed filesystem magic number table from aio_statvfs docs as
62 statvfs doesn't actually return this info at all (statfs does).
63 - add a bunch of (mostly linux-specific) constants for use in ioctls
64 (see aio_ioctl docs).
65 - treescan now has a proper manpage and useful --help output.
66 - new option --sync in treescan, to sync everything in a subtree.
67 - changed default for aio_msync flags to MSYNC_SYNC.
68 - document offset/length behaviour of mprotect/madvise.
69 - support linux's renameat2 (via aio_rename2).
70 - add aio_rename2, an aio_rename with flags.
71 - add F_DUPPFD_CLOEXEC, F_OFD_[SG]ETLKW? constants.
72 - add FALLOC_FL_INSERT_RANGE, FALLOC_FL_UNSHARE_RANGE.
73 - (libeio) use posix_close if available.
74 - (libeio) internal close() calls no longer disturb errno.
75 - add IO:AIO::FALLOC_FL_UNSHARE.
76 - update schmorp.h for removal of USE_SOCKETS_AS_HANDLES
77 and better eventfd detection.
78
794.34 Sun May 1 19:18:24 CEST 2016
80 - def0.h was not properly generated during previous release, causing
81 compile errors on various platforms.
82 - major/minor were accidentally switched (reported by Alexander Lishenyuk).
83 - removed duplicate definition of MAP_HUGETLB, that was found due to
84 a bug in Perl::Tidy (testcase by alaska332@gmail.com).
85 - added (untested!) aio_fcntl, aio_ioctl requests.
86 - (libeio) names set via prctl are truncated to 15 chars + nul, not 16,
87 as manpages-dev originally claimed.
88
894.33 Mon Jan 18 12:50:10 CET 2016
90 - add IO::AIO::pipe2 function.
91 - added support for FALLOC_FL_COLLAPSE_RANGE and FALLOC_FL_ZERO_RANGE
92 constants.
93 - added support for O_TMPFILE and O_PATH constants.
94 - added support for MAP_FIXED, MAP_GROWSDOWN,MAP_32BIT, MAP_HUGETLB, MAP_STACK
95 consdtants, whether they can be sensibly used or not.
96 - use NO_INIT where applicable.
97 - update libecb.
98 - added stability canary support.
99 - updated linux super magic table to 4.3.3.
100
1014.32 Wed Feb 11 20:32:11 CET 2015
102 - replace off_t by STRLEN where appropriate, should not result in
103 user-visible changes.
104 - update ecb.h for C11 compatibility.
105
1064.31 Tue Jun 3 03:29:27 CEST 2014
107 - work around more 5.20 bugs. backwards compatibility my ass.
108
1094.3 Fri Apr 11 06:22:38 CEST 2014
110 - perl5porters broke Async::Interrupt, BDB, EV, IO::AIO, OpenCL
111 without warning by switching the meaning of USE_SOCKETS_AS_HANDLES
112 in 5.18. What's so attractive about giving a shit about backwards
113 compatibility - I will never understand.
114
1154.2 Sat Jan 25 01:13:14 CET 2014
116 - aio_group could corrupt memory because it didn't restore
117 the stack after req_submit.
118 - be more careful on (e.g. permission) errors in bin/treescan.
119 - work around changes in ExtUtils::MakeMaker.
120 - (libeio) implement aio_realpath for win32.
121 - (xthread) work around compile time bugs in ptw32.
122 - added IO::AIO::pipesize.
123 - (libecb) insignificant update.
124
1254.19 Sun Jan 6 12:47:26 CET 2013
126 - avoid endless loop in fiemap with some XFS files.
127 - in aio_rename and aio_rmdir, specialcase the case of [$wd, "."]
128 and call rename/rmdir instead of renameat/unlinkat.
129
1304.18 Thu Oct 11 07:01:26 CEST 2012
131 - fix unintended xthread_create by intentionalising it :)
132
1334.17 Thu Oct 11 05:19:47 CEST 2012
134 - rename aio_fallocate to aio_allocate, to match documentation.
135 - add list of linux fsid values to aio_statvfs docs.
136 - work around a bug in btrfs' FIEMAP ioctl implementation.
137 - work around AIX bug: statvfs.f_fsid is a struct, not unsigned long
138 as per unix spec.
139
1404.16 Tue Aug 14 05:39:03 CEST 2012
141 - aio_statvfs was wromgly marked for wd emulation, causing
142 it to malfunction for paths.
143 - fix a crash in aio_fiemap, when used on ranges without any
144 extents.
145 - work around linux kernel bug (at least in 3.2): kernel might
146 trash fiemap input arguments.
147 - work around linux kernel bug (at least in 3.2): kernel does not
148 set FIEMAP_EXTENT_LAST on last segment.
149 - work around linux kernel bug (at least in 3.2): kernel silently
150 truncates segment count if a file.
151 - make fh argument of IO::AIO::mmap optional, also add mmap/munmap
152 to quick overview.
153 - splice can corrupt data.
154 - (libeio) remove pread/pwrite emulation.
155 - do not grow mmaped scalars in aio_read.
156 - add FALLOC_FL_PUNCH_HOLE and document fallocate.
157 - provide pread/pwrite for win32, making it link again on native win32.
158
1594.15 Tue Apr 10 06:59:00 CEST 2012
160 - always include linux/types.h for fiemap, for compatibility to
161 ancient systems (Paul Howarth).
162 - experimental support for IO::AIO::splice and ::tee (no aio_...).
163 - provide SEEK_HOLE and SEEK_DATA, if available.
164 - work around (again!) an immensely stupid bug in RHEL, defining
165 autoconf macros in linux system headers (analysed by Paul Howarth).
166
1674.14 Sat Apr 7 02:45:18 CEST 2012
168 - fix stat structure usage on windows, which caused bogus stat results.
169 - (libeio) make readahead emulation behave more like actual readahead by never failing.
170 - new request aio_seek.
171 - new request aio_fiemap.
172 - autogenerate the #ifdef/#define 0 blocks for symbols we export.
173
1744.12 Fri Dec 30 08:51:25 CET 2011
175 - realpath would return a random value if the name was too long,
176 instead of -1.
177 - port to c89.
178
1794.11 Mon Oct 10 00:24:11 CEST 2011
180 - libeio didn't compile on !linux (Paul Howarth).
181
1824.1 Sun Oct 9 10:24:11 CEST 2011
183 - IO::AIO did access uninitialised memory on unsuccessful stats.
184 - (libeio) added syncfs syscall wrapper.
185 - (libeio) set thread name on linux (ps -L/Hcx, top, gdb).
186 - (libeio) support multiple indepenent working directories.
187 - applied speling corrections by Nicholas Bamber.
188 - tune treescan #threads and #outstanding requests a bit.
189 - reduce the number of file descriptors in use at any one time
190 in treescan, to avoid running out of them (and using too much ram).
191 - take advantage of working directoriy abstractions
192 in aio_scandir and treescan.
193 - reduce compiled size by ~10% by not inlining some key functionality.
194 - added --progress switch to treescan.
195
1964.0 Mon Jul 18 05:01:10 CEST 2011
197 - INCOMPATIBLE CHANGE: fork is no longer supported (indeed, it never was),
198 see FORK BEHAVIOUR in manpage for details.
199 - passes testsuite on win32 now and may actually work
200 (activestate 5.10.1 / MSVC6, YMMV).
201 - (libeio) fix a deadlock where a wakeup signal could be missed when
202 a timeout occured at the same time.
203 - (libeio) added realpath.
204 - (libeio) added fallocate.
205 - (libeio) disabling sendfile on darwin unfortunately broke the emulation.
206 - (libeio) do not acquire any locks when forking.
207 - (libeio) use fewer time() syscalls when waiting for new requests.
208
2093.93 Wed Jun 29 23:44:18 CEST 2011
210 - ECB.H WAS MISSING.
211
2123.92 Wed Jun 29 14:45:41 CEST 2011
213 - ecb.h was missing.
214
2153.91 Wed Jun 29 13:24:42 CEST 2011
216 - (libeio) work around a Linux (and likely FreeBSD and other
217 kernels) bug where sendfile would not transfer all the requested
218 bytes on large transfers, using a heuristic.
219 - buggy sendfile caused aio_move/copy to sometimes fail for big
220 files (fortunately it checks that the whole file has been
221 transferred...)
222 - use libecb for higher performance and higher portability.
223 - (libeio) disable sendfile on darwin, it's too broken.
224 - disable fork tests on !linux, as only linux supports mixing
225 pthread and fork in perl.
226 - document the fact that fork doesn't work anymore when using
227 this module, on anything !GNU/Linux.
228 - increase timeout in t/04_fork.t, as too many CPAN-tester setups
229 run on a 0.1MHz cpu. Or so.
230
2313.9 Fri May 27 02:43:47 CEST 2011
232 - (libeio) fix memory corruption in aio_readdirx for the flags
233 combination READDIR_STAT_ORDER | READDIR_DIRS_FIRST.
234 - add lots of newer POSIX and GNU/Linux-specific open
235 flags.
236
2373.8 Sun Mar 27 12:25:33 CEST 2011
238 - use nonstandard but maybe-working-on-bsd fork technique.
239 - support a max_idle value of 0.
240 - support setting of idle timeout value (IO::AIO::idle_timeout).
241
2423.72 Fri Feb 11 04:25:38 CET 2011
243 - use _POSIX_MEMLOCK_RANGE to detect mlock/munlock.
244 - aio_mknod always used a dev_t value of 0.
245 - new treescan option: --grep.
246 - add more S_IF macros, and major/minor/makedev "macros".
247
2483.71 Thu Dec 30 08:18:46 CET 2010
249 - the numerical result value passed to callbacks did not stringify
250 correctly, due to internal reuse and failure to reset the sv flags.
251 - actually test for posix_[mf]advise, as at least uClibc defines
252 _POSIX_ADVISORY_INFO without actually having any of the required
253 funcitonality. ugh.
254
2553.7 Mon Nov 1 23:00:34 CET 2010
256 - implement/add madvise, mmap, munmap, aio_mlockall, munlockall,
257 aio_mlock, munlock, msync and mtouch to @EXPORT_OK.
258 - document the sad state of affairs w.r.t. pthread on many bsds.
259 - do not enable mmap on systems without _POSIX_MAPPED_FILES
260 (openbsd 4.8).
261 - do not leak memory in IO::AIO::mmap when the scalar already
262 had string-data.
263 - add O_RDWR, O_APPEND and O_EXCL symbols and semi-document
264 them.
265 - cache the result IV, for a minor speedup in the common case.
266 - croak when an mmapped-scalar changes location, to detect
267 user-errors better.
268 - fix aio_readlink prototype.
269
2703.65 Wed Mar 31 02:45:05 CEST 2010
271 - actually use PATH_MAX instead of NAME_MAX for readlink, as to not
272 cut off long pathnames in aio_readlink (based on patch by
273 Rasmus Andersson).
274 - a double fork partially killed the event pipe (great testcase
275 by dormando). affects IO::AIO, BDB and Async::Interrupt.
276 - suck steve's dick and rename our symbols to avoid colliding
277 with nonstandard identifier spam on the broken os x pseudo-os.
278 affects IO::AIO and BDB.
279
2803.6 Mon Jan 11 00:43:39 CET 2010
281 - (libeio) more fixes for the freebsd/apple sendfile - broken by
282 manpage standards, but apparently correct accoridng to actual
283 kernel sources.
284 - add IO::AIO::mmap/munmap support.
285 - add IO::AIO::m(un)lockall support.
286 - clean up manpage.
287
2883.5 Thu Jan 7 21:25:04 CET 2010
289 - (liebio) fix freebsd sendfile (Vanilla Hsu).
290 - (libeio) also fix darwin sendfile that suffered from a similar bug.
291 - add aio_statvfs as interface to statvfs/fstatvfs.
292 - work around buggy symlink() on cygwin in the testsuite.
293 - wtf. freebsd-8.0 actually passes the testsuite! I knew
294 they could implement fork and semaphores one day! cheers!
295
2963.4 Sat Jan 2 15:13:04 CET 2010
297 - (libeio) max_poll_time was not properly converted to ticks.
298 - clarify cancel_subs description.
299 - IO::AIO::sendfile did not actually return the return value
300 from the sendfile call.
301 - implement aio_msync, aio_mtouch.
302 - (libeio) tentatively support darwin in sendfile.
303
3043.31 Thu Nov 12 02:14:29 CET 2009
305 - fix result status documentation of aio_copy, aio_move.
306 - speed up object creation considerably by avoiding
307 hash lookups.
308
3093.3 Wed Aug 5 13:52:58 CEST 2009
310 - use common::sense.
311 - use common schmorp.h header.
312 - allow integers (file descriptors) in addition to file handles.
313 - take advantage of linux' eventfd (but it seems slower on smp?).
314 - use poll not select on posix platforms.
315
3163.261 Wed Jul 1 10:11:51 CEST 2009
317 - more 0S X workarounds (patch by Tokuhiro Matsuno).
318
3193.26 Tue Jun 30 09:33:26 CEST 2009
320 - 0S X of course claims to be posix 2008 but lacks posix_fadvise.
321 try to work around this horribly broken OS in a somewhat hackish
322 way. might help other os's too.
323
3243.25 Sat Jun 27 05:18:26 CEST 2009
325 - added IO::AIO::fadvise and IO::AIO::sendfile.
326 - (libeio) replaced quicksort+insertion sort by a tuned radix
327 sort + insertion sort, resulting in comparable runtime (usually
328 faster) to the old version, but without any ill side effects on
329 degenerated (for quicksort) data.
330 - (libeio) correctly sort dirs by inodes if we have perfect type
331 knowledge and DIRS_FIRST is used.
332 - (libeio) internally the wrong DT_* constants were used, but no
333 known system has differing EIO_DT_*/DT_* values, so not an issue.
334 - removed a (harmless) assert that was left over on the code
335 but should not have been.
336 - use more correct types (change IO length from IV to VAL64,
337 which makes a difference on systems without 64 bit perls).
338
3393.23 Sat Jun 13 16:57:58 CEST 2009
340 - fix off-by-one bug in aio_readdir that was introduced in the
341 rushed 3.22 release.
342
3433.22 Sat Jun 13 15:32:40 CEST 2009
344 - speed up readdirx sort algorithm slightly.
345 - bin/treescan was missing from distro tarball.
346
3473.21 Fri Jun 12 18:45:53 CEST 2009
348 - new options --dirs and --files for treescan.
349 - install bin/treescan by default.
350 - (libeio) aio_readdir can now be cancelled while executing.
351 - fix a printf format string for 64 bit systems (could lead
352 to problems on big endian 64 bit systems).
353 - do not use qsort() but our own algorithm: glibc initialises
354 the whole locale and I/O subsystem inside qsort, causing
355 a stack overflow on 32 bit machines. The new sort uses much less
356 stack and is more than twice as fast in typical situations.
357
3583.2 Sun Jun 7 20:30:05 CEST 2009
359 - (libeio) pwrite emulation was even more flawed than intended and did
360 not restore the file offset.
361 - add aio_readdirx, which can return inode and filetype and sort
362 the names in various ways.
363 - unfortunately, utime, chmod, chown on an open file that has just
364 been written can easily block, which caused aio_copy to block the
365 process. no more!
366 - no longer rely on dst path in aio_copy when futime is available.
367
3683.19 Tue Apr 21 22:05:21 CEST 2009
369 - more perl 5.10 workarounds for aio_read and write.
370 - aio_write no longer modifies the sv (if possible).
371 - aio_read now works correctly with magic values.
372
3733.18 Sun Apr 19 21:17:32 CEST 2009
374 - better diagnostics when some aio_* functions get passed an illegal fh.
375 - try to avoid crashes due to incompatible 5.10 API changes. grmbl.
376
3773.17 Thu Nov 20 08:45:36 CET 2008
378 - (libeio) added aio_sync_file_range (untested).
379 - add aio_busy to @IO::AIO::AIO_REQ.
380
3813.16 Wed Oct 22 18:28:01 CEST 2008
382 - use SvREFCNT_inc instead of SvREFCNT_inc_NN in a non-speed critical
383 part to improve portability to perl 5.8 (reported by szymon).
384
3853.15 Mon Oct 13 00:39:55 CEST 2008
386 - automatic removal of feeders was broken.
387 - (libeio) use a more robust method to detect whether a feeder
388 has added something to the group or not.
389
3903.1 Thu Oct 2 13:34:40 CEST 2008
391 - pre-deref the passed callback object, for increased speed
392 and decreased memory usage.
393 - call on_next_submit callback even for aio_group - impact unknown,
394 but seems more correct.
395 - $req->cb now returns the original callback.
396 - (libeio) pass EIO_GROUP/aio_group requests through the queue without
397 requiring a thread switch.
398 - (libeio) status code of aio_futime and aio_utime was always passed 0.
399 - do some other ยต-optimisations.
400
4013.07 Sat Aug 2 16:06:13 CEST 2008
402 - do not include LIBS in autoconf tests.
403
4043.06 Tue Jul 15 12:41:32 CEST 2008
405 - move preadwritelock definition before it's first reference,
406 to make it compile again on broken platforms (they still exist)
407 or badly cofngiured perls (redhat...), reported by Rob Bloodgood.
408
4093.05 Thu Jun 19 23:23:52 CEST 2008
410 - work around perl overriding readdir etc. with thread-unsafe
411 (sic!) versions.
412
4133.04 Wed Jun 18 01:35:38 CEST 2008
414 - (libeio) fix eio_mknod, which confused it's arguments.
415 - (libeio) do not use readdir_r, as Ulrich Drepper pointed out that this
416 is stupid.
417 - (libeio) fix eio__readahead prototype, patch by Jost Krieger.
418 - (libeio) fix a bug that could potentially cause IO::AIO
419 not to get initialised properly.
420
4213.03 Thu May 29 05:33:30 CEST 2008
422 - (libeio) correctly call pthread_attr_destroy ().
423 - (libeio) work around broken bsd headers once more.
424 - reduce shared library size again by not including wrappers.
425 - max_outstanding could cause poll to enter a busy-waiting loop.
426 - document the new IO::AIO::poll_cb result value.
427
4283.02 Mon May 12 02:32:02 CEST 2008
429 - fix a memory leak on aio_readlink.
430 - bring back working fchmod.
431 - nop and busy now set result to 0.
432 - set errno to ENOMEM when allocation fails.
433
4343.01 Sun May 11 03:07:03 CEST 2008
435 - (libeio) make it compile on systems without readahead or readdir_r.
436 - (libeio) improve configure check for readahead availability.
437 - do not try to link against -lrt.
438 - use a separate configure script for IO::AIO (not the libeio one).
439
4403.0 Sun May 11 00:57:14 CEST 2008
441 - added bin/treescan to the distribution.
442 - switched to using libeio.
443 - LOTS OF INCOMPATIBLE CHANGES:
444 - remove signal functionality, it is not worth the effort.
445 - max_outstanding no longer returns the previous number of requests.
446 - poll_cb no longer returns number of requests.
447
4482.62 Sat Apr 26 13:59:33 CEST 2008
449 - port to solaris perls configured for old posix
450 (analysed by Jost Krieger).
451 - keep a reference to the perl filehandle object in aio_close,
452 so it doesn't get closed prematurely, leading to ugly races.
453
4542.61 Wed Apr 16 18:45:02 CEST 2008
455 - fix treescan output duplication and improve output ordering.
456 also display files given on the commandline.
457 - use a different algorithm for aio_close that is faster
458 and probably has even lower chances of blocking.
459 - do our own stack memory management for threads - linux
460 allocates outrageous amounts of VM (not so bad unless you
461 use mlockall...), which severely limits the number of threads
462 on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
463 and 4096 * sizeof (long) (usually this is 16..64k).
464
4652.6 Sun Mar 30 08:28:11 CEST 2008
10 - added aio_sync. 466 - added aio_sync.
467 - added aio_pathsync.
468 - fix prototypes of (void) functions.
11 469
122.51 Sat Oct 6 16:04:54 CEST 2007 4702.51 Sat Oct 6 16:04:54 CEST 2007
13 - perlio isn't generally threadsafe, so aio_close could not work reliably. 471 - perlio isn't generally threadsafe, so aio_close could not work reliably.
14 aio_close now tries a safe hack that might not be that asynchronous 472 aio_close now tries a safe hack that might not be that asynchronous
15 (see the manpage for details). 473 (see the manpage for details).

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