[ViewVC] Contents of: cvs/IO-AIO/Changes

Revision history for IO::AIO

TODO: better autoconf.pm that can return LIBS etc.
TODO: aio_cptree/mvtree
TODO: reduce condvar fairness: schedule hot-cache-threads first?
TODO: splice/tee/vmsplice? (http://kerneltrap.org/node/6505 http://lwn.net/Articles/178199/)
TODO: aio_fcntl, at least for file-locking
TODO: fallocate, if it wouldn't be so useless.
TODO: IO::AIO::mmap? aio_mincore?

3.5  Thu Jan  7 21:25:04 CET 2010
        - (liebio) fix freebsd sendfile (Vanilla Hsu).
        - (libeio) also fix darwin sendfile that suffered from a similar bug.
        - add aio_statvfs as interface to statvfs/fstatvfs.
        - work around buggy symlink() on cygwin in the testsuite.
        - wtf. freebsd-8.0 actually passes the testsuite! I knew
          they could implement fork and semaphores one day! cheers!

3.4  Sat Jan  2 15:13:04 CET 2010
        - (libeio) max_poll_time was not properly converted to ticks.
        - clarify cancel_subs description.
        - IO::AIO::sendfile did not actually return the return value
          from the sendfile call.
        - implement aio_msync, aio_mtouch.
        - (libeio) tentatively support darwin in sendfile.

3.31 Thu Nov 12 02:14:29 CET 2009
        - fix result status documentation of aio_copy, aio_move.
        - speed up object creation considerably by avoiding
          hash lookups.

3.3  Wed Aug  5 13:52:58 CEST 2009
        - use common::sense.
        - use common schmorp.h header.
        - allow integers (file descriptors) in addition to file handles.
        - take advantage of linux' eventfd (but it seems slower on smp?).
        - use poll not select on posix platforms.

3.261 Wed Jul  1 10:11:51 CEST 2009
        - more 0S X workarounds (patch by Tokuhiro Matsuno).

3.26 Tue Jun 30 09:33:26 CEST 2009
        - 0S X of course claims to be posix 2008 but lacks posix_fadvise.
          try to work around this horribly broken OS in a somewhat hackish
          way. might help other os's too.

3.25 Sat Jun 27 05:18:26 CEST 2009
        - added IO::AIO::fadvise and IO::AIO::sendfile.
        - (libeio) replaced quicksort+insertion sort by a tuned radix
          sort + insertion sort, resulting in comparable runtime (usually
          faster) to the old version, but without any ill side effects on
          degenerated (for quicksort) data.
        - (libeio) correctly sort dirs by inodes if we have perfect type
          knowledge and DIRS_FIRST is used.
        - (libeio) internally the wrong DT_* constants were used, but no
          known system has differing EIO_DT_*/DT_* values, so not an issue.
        - removed a (harmless) assert that was left over on the code
          but should not have been.
        - use more correct types (change IO length from IV to VAL64,
          which makes a difference on systems without 64 bit perls).

3.23 Sat Jun 13 16:57:58 CEST 2009
        - fix off-by-one bug in aio_readdir that was introduced in the
          rushed 3.22 release.

3.22 Sat Jun 13 15:32:40 CEST 2009
        - speed up readdirx sort algorithm slightly.
        - bin/treescan was missing from distro tarball.

3.21 Fri Jun 12 18:45:53 CEST 2009
        - new options --dirs and --files for treescan.
        - install bin/treescan by default.
        - (libeio) aio_readdir can now be cancelled while executing.
        - fix a printf format string for 64 bit systems (could lead
          to problems on big endian 64 bit systems).
        - do not use qsort() but our own algorithm: glibc initialises
          the whole locale and I/O subsystem inside qsort, causing
          a stack overflow on 32 bit machines. The new sort uses much less
          stack and is more than twice as fast in typical situations.

3.2  Sun Jun  7 20:30:05 CEST 2009
        - (libeio) pwrite emulation was even more flawed than intended and did
          not restore the file offset.
        - add aio_readdirx, which can return inode and filetype and sort
          the names in various ways.
        - unfortunately, utime, chmod, chown on an open file that has just
          been written can easily block, which caused aio_copy to block the
          process. no more!
        - no longer rely on dst path in aio_copy when futime is available.

3.19 Tue Apr 21 22:05:21 CEST 2009
        - more perl 5.10 workarounds for aio_read and write.
        - aio_write no longer modifies the sv (if possible).
        - aio_read now works correctly with magic values.

3.18 Sun Apr 19 21:17:32 CEST 2009
        - better diagnostics when some aio_* functions get passed an illegal fh.
        - try to avoid crashes due to incompatible 5.10 API changes. grmbl.

3.17 Thu Nov 20 08:45:36 CET 2008
        - (libeio) added aio_sync_file_range (untested).
        - add aio_busy to @IO::AIO::AIO_REQ.

3.16 Wed Oct 22 18:28:01 CEST 2008
        - use SvREFCNT_inc instead of SvREFCNT_inc_NN in a non-speed critical
          part to improve portability to perl 5.8 (reported by szymon).

3.15 Mon Oct 13 00:39:55 CEST 2008
        - automatic removal of feeders was broken.
        - (libeio) use a more robust method to detect whether a feeder
          has added something to the group or not.

3.1  Thu Oct  2 13:34:40 CEST 2008
        - pre-deref the passed callback object, for increased speed
          and decreased memory usage.
        - call on_next_submit callback even for aio_group - impact unknown,
          but seems more correct.
        - $req->cb now returns the original callback.
        - (libeio) pass EIO_GROUP/aio_group requests through the queue without
          requiring a thread switch.
        - (libeio) status code of aio_futime and aio_utime was always passed 0.
        - do some other µ-optimisations.

3.07 Sat Aug  2 16:06:13 CEST 2008
        - do not include LIBS in autoconf tests.

3.06 Tue Jul 15 12:41:32 CEST 2008
        - move preadwritelock definition before it's first reference,
          to make it compile again on broken platforms (they still exist)
          or badly cofngiured perls (redhat...), reported by Rob Bloodgood.

3.05 Thu Jun 19 23:23:52 CEST 2008
        - work around perl overriding readdir etc. with thread-unsafe
          (sic!) versions.

3.04 Wed Jun 18 01:35:38 CEST 2008
        - (libeio) fix eio_mknod, which confused it's arguments.
        - (libeio) do not use readdir_r, as Ulrich Drepper pointed out that this
          is stupid.
        - (libeio) fix eio__readahead prototype, patch by Jost Krieger.
        - (libeio) fix a bug that could potentially cause IO::AIO
          not to get initialised properly.

3.03 Thu May 29 05:33:30 CEST 2008
        - (libeio) correctly call pthread_attr_destroy ().
        - (libeio) work around broken bsd headers once more.
        - reduce shared library size again by not including wrappers.
        - max_outstanding could cause poll to enter a busy-waiting loop.
        - document the new IO::AIO::poll_cb result value.

3.02 Mon May 12 02:32:02 CEST 2008
        - fix a memory leak on aio_readlink.
        - bring back working fchmod.
        - nop and busy now set result to 0.
        - set errno to ENOMEM when allocation fails.

3.01 Sun May 11 03:07:03 CEST 2008
        - (libeio) make it compile on systems without readahead or readdir_r.
        - (libeio) improve configure check for readahead availability.
        - do not try to link against -lrt.
        - use a separate configure script for IO::AIO (not the libeio one).

3.0  Sun May 11 00:57:14 CEST 2008
        - added bin/treescan to the distribution.
        - switched to using libeio.
        - LOTS OF INCOMPATIBLE CHANGES:
          - remove signal functionality, it is not worth the effort.
          - max_outstanding no longer returns the previous number of requests.
          - poll_cb no longer returns number of requests.

2.62 Sat Apr 26 13:59:33 CEST 2008
        - port to solaris perls configured for old posix
          (analysed by Jost Krieger).
        - keep a reference to the perl filehandle object in aio_close,
          so it doesn't get closed prematurely, leading to ugly races.

2.61 Wed Apr 16 18:45:02 CEST 2008
        - fix treescan output duplication and improve output ordering.
          also display files given on the commandline.
        - use a different algorithm for aio_close that is faster
          and probably has even lower chances of blocking.
        - do our own stack memory management for threads - linux
          allocates outrageous amounts of VM (not so bad unless you
          use mlockall...), which severely limits the number of threads
          on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
          and 4096 * sizeof (long) (usually this is 16..64k).

2.6  Sun Mar 30 08:28:11 CEST 2008
        - added aio_sync.
        - added aio_pathsync.
        - fix prototypes of (void) functions.

2.51 Sat Oct  6 16:04:54 CEST 2007
        - perlio isn't generally threadsafe, so aio_close could not work reliably.
          aio_close now tries a safe hack that might not be that asynchronous
          (see the manpage for details).
        - discard callback return values as to not grow the stack endlessly
          when poll_cb handles many requests without returning.
        - minor code cleanups.

2.5  Thu Oct  4 14:49:08 CEST 2007
        - replaced _fd2fh with faster xs code.
        - aio_close will now try to do "the right thing" and thus might
          work sensibly for the very first time.

2.41 Mon Sep 24 21:28:21 CEST 2007
        - after fork, invest some work to make sure that the poll_fileno
          stays stable (by dup2'ing the new fd over the old one), to make
          it easier for programs/libs that don't control their forking
          behaviour and cannot recreate their watchers.

2.4  Sun Aug  5 18:44:22 CEST 2007
        - add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
          successfully demonstrated that you can block on futimes...).
        - allow undef as fileoffset for aio_read/write and use read/write(2)
          internally (useful for sockets or O_APPEND handles).
        - allow undef for length in aio_write.
        - negative dataoffsets work as expected now in aio_read/aio_write.
        - use NV instead of UV for 32 bit perls and file offsets, as NVs
          have a larger range then.
        - shared code between BDB and IO::AIO.
        - aio_busy was completely broken. now fixed.
        - readahead emulation now returns something.
        - correctly set errno to ENOSYS on unimplemented functions
          (should never happen, though).
        - large changes to make it partially compile and run on win32,
          but win32 lacks too much functionality, and perl overrides way
          too many functions with crashing versions.

2.33 Tue Jan 23 23:55:41 CET 2007
        - fix install path (Andreas J. Koenig).

2.32 Mon Jan 22 16:56:23 CET 2007
        - added aio_rmtree.
        - wow, aio_mkdir was missing.
        - aio_load did return undef on error, not -1.
        - use prefixexp not prefix in autoconf.pm
          (suggested by ... rt.cpan.org unreachable).
        - avoid installing autoconf.pm.

2.31 Sat Jan  6 03:46:02 CET 2007
        - added aio_load.

2.3  Sat Dec 23 05:48:07 CET 2006
        - fix off-by-one bug in aio_read, causing memory corruption
          or crashes.

2.21  Fri Dec 22 05:03:38 CET 2006
        - minor doc updates.
        - minor cleanups.
        - IO::AIO::poll returns request count.
        - undocumented and unfinished async-signal-reporting.

2.2  Tue Oct 31 00:31:00 CET 2006
        - minor doc updates.
        - added aio_readlink.
        - properly zero-terminate aio_read buffer.
        - fix aio_read/write with nonzero dataoffset.
        - reduced size of aio request structure.
        - better diagnostics when pathnames etc. are not byte-encoded;
          do not leak request in that case, either.

2.1  Sun Oct 29 02:01:57 CET 2006
        - INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
          IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
        - fix a bug in aio_move where it would fail everytime
          it would have to copy files manually.
        - doc updates.
        - start threads only on (very low) demand.
        - end superfluous threads automatically after 10s idling.
        - add IO::AIO::max_idle to control this.
        - some tuning applied to random places.
        - add aio_mknod.

2.0  Thu Oct 26 18:27:58 CEST 2006
        - minor incompatibility: max_outstanding semantics have changed.
        - major rewrite, consider all functionality EXPERIMENTAL.
        - aio requests can be cancelled.
        - callbacks can be (re-)set later.
        - aio requests can choose between 9 priorities.
        - add aio_group: aio requests can be grouped
          into composite requests.
        - generator interface for groups.
        - add IO::AIO::poll_some.
        - major documentation improvements.
        - very minor bugfixes.
        - add aio_nop for dummy requests.
        - add aio_busy mainly for benchmarking and debugging.
        - use "fast" mutexes on linux.
        - use dynamic (and larger) buffers instead of
          putting them onto the stack.
        - optimise x86 and amd64 a bit.
        - better error checking when ENOMEM.
        - hopefully fix mem and dirp leaks on fork.
        - warn about broken perl malloc.
        - compiles on cygwin (but pread is broken on cygwin
          which is not detected by autoconf, so you have to
          edit autoconf/config.h yourself to enable emulation).

1.8  Sat Jun 24 22:20:44 CEST 2006
        - add and/or document aio_rename, aio_link, aio_symlink and aio_move.

1.73 Wed Mar  1 22:49:32 CET 2006
        - codename "jost"
        - AIX/Solaris(?) aren't being helpful again, hardcode a value
          for NAME_MAX and drive with your eyes closed (reported by
          wcooley@nakedape.cc).

1.72 Thu Feb  2 00:40:44 CET 2006
        - another minor bug in aio_scandir, again, the callback was called
          twice when the directory can't be stat'ed.

1.71 Mon Dec 26 20:20:03 CET 2005
        - grr, another minor bug in aio_scandir, this time resulting
          in a runtime error.

1.7  Mon Dec 26 19:29:48 CET 2005
        - aio_scandir errornously called callback twice in some cases.
        - added AnyEvent example.

1.61 Wed Sep  7 19:40:42 CEST 2005
        - no longer include $Config{libs}, as distros include too much
          garbage in there that is not installed on typical systems
          (for example, debian links perl against -lgdbm and many more
          libraries despite perl not needing it, slowing down startup and
          wasting memory).

1.6  Tue Aug 30 17:44:44 CEST 2005
        - added aio_readdir, aio_scandir.
        - added aio_sendfile, including sendfile emulation when sendfile
          isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
          support is unavailable on my solaris 8 machine, but preliminary
          code is there. What's lacking is configury stuff and testing...).

1.5  Sat Aug 20 02:32:19 CEST 2005
        - create the aio threads on demand only (good after forking).
        - somebody nagged about C89 compatibility, so this release should
          be C89 compatible, but no guarantees for future ones.
        - abort when the configure script fails.

1.4  Wed Aug 17 08:07:27 CEST 2005
        - forgot to recreate the pipe after forking, this could cause
          deadlocks.

1.3  Wed Aug 17 07:25:54 CEST 2005
        - properly propagate exceptions from callbacks, instead of silently
          eating them.
        - use a different fork algorithm that avoids recursive callback
          invocations and reduces fork latency in busy processes.
        - fix a bug where the buffer scalar in aio_read got assigned the wrong
          length after reading.
        - fix a bug where the child would process some outstanding requests
          from the parent.
        - make a copy of the callback scalar, to avoid some very uncommon
          (but valid) usages where the callback scalar changes.
        - the callback was never freed in aio_read/aio_write.
        - aio_read/aio_write will now set the readonly flag on the data
          scalar for better error reporting.

1.2  Wed Aug 17 01:22:58 CEST 2005
        - verified on cygwin, linux/amd64+ia32+alpha, solaris.
        - use SvPVbyte for filenames now. You *need* to encode your strings to
          the external filename encoding first.
        - fix the bug where filehandles could leak (again).
        - clarify freebsd situation: make it work and tell me how, or go away
          with your underdocumented, broken and outdated OS.
        - fork'ing should now be officially supported (where linux and
          posix contradict each other, I followed posix).
        - only call read() once per poll, not twice (speedup).
        - new functions: aio_rmdir, aio_symlink.
        - force callback arguments to be undef or a reference, for better
          error catching.

1.1  Sun Aug  7 05:27:23 CEST 2005
        - added configure script to detect availability of some calls.
          (imperfect, as we cannot detect things like -lrt due to missing
          feedback yet).
        - emulate fdatasync via fsync, pread/pwrite via unsafe read/write
          and readahead via manual reading on platforms lacking those.
        - ported t/03_errors.t+framework by Brad Fitzpatrick
          from Linux::AIO.
        - removed XOPEN_SOURCE because stupid solaris 9 doesn't
          compile with it enabled. Probably breaks others. Oh well.
        - try to be more careful with errno on non-threaded perls.
        - cygwins perl insisted on a matching open mode when morphing
          the fd to an fh.
        - convert sv's to "byte" encoding in aio_read/aio_write. Might
          do that for pathnames, too, in the future, so make sure you
          properly encode your pathnames.

1.0  Fri Jul 22 10:43:30 CEST 2005
        - aio_open did not reliably deliver (open) filehandles.
        - all aio_*-functions keep a reference to the filehandle so
          it doesn't go away while the aio requests is working on it.
        - disable warnings in AIO.pm.

0.9  Wed Jul 20 23:55:04 CEST 2005
        - allow recursive calls to poll_cb, use less locking calls, too.
        - fix the Gtk2-example in the SYNOPSIS.
        - use pread/pwrite not pread64/pwrite64. this was simply a leftover
          from Linux::AIO.
          (found by compiling on cygwin. Unfortunately, cygwin declares but
          does not implement pread/pwrite).
        - only include <sys/syscall.h> on linux.

0.5  Tue Jul 12 13:03:09 CEST 2005
        - removed #include <endian.h>, it's not portable, and we don't
          need it anyway.
        - link against -lrt, as it might contain goodies such as fdatasync,
          and often aio_read, which we do not use yet, but it shouldn't hurt.

0.4  Mon Jul 11 05:28:25 CEST 2005
        - added IO::AIO::flush, IO::AIO::poll.
        - make callback argument optional for all calls.

0.3  Mon Jul 11 01:42:37 CEST 2005
        - restructured manpage.
        - added SYNOPSIS with examples for Event, Glib, Tk.
        - remove explicit context support so I don't have to maintain
          it for threaded perls (i.e. it should work now :).

0.2  Sun Jul 10 22:57:12 CEST 2005
        - return immediately from poll_wait if nreqs==0.
        - get rid of the request pipe and use faster thread-thread
          communications for most requests and responses.

0.1
        - cloned from Linux::AIO, which is very similar.

Revision:	1.217
Committed:	Thu Jan 7 20:25:57 2010 UTC (14 years, 4 months ago) by root
Branch:	MAIN
CVS Tags:	rel-3_5
Changes since 1.216:	+3 -0 lines
Log Message:	3.5
#	Content
1	Revision history for IO::AIO
2
3	TODO: better autoconf.pm that can return LIBS etc.
4	TODO: aio_cptree/mvtree
5	TODO: reduce condvar fairness: schedule hot-cache-threads first?
6	TODO: splice/tee/vmsplice? (http://kerneltrap.org/node/6505 http://lwn.net/Articles/178199/)
7	TODO: aio_fcntl, at least for file-locking
8	TODO: fallocate, if it wouldn't be so useless.
9	TODO: IO::AIO::mmap? aio_mincore?
10
11	3.5 Thu Jan 7 21:25:04 CET 2010
12	- (liebio) fix freebsd sendfile (Vanilla Hsu).
13	- (libeio) also fix darwin sendfile that suffered from a similar bug.
14	- add aio_statvfs as interface to statvfs/fstatvfs.
15	- work around buggy symlink() on cygwin in the testsuite.
16	- wtf. freebsd-8.0 actually passes the testsuite! I knew
17	they could implement fork and semaphores one day! cheers!
18
19	3.4 Sat Jan 2 15:13:04 CET 2010
20	- (libeio) max_poll_time was not properly converted to ticks.
21	- clarify cancel_subs description.
22	- IO::AIO::sendfile did not actually return the return value
23	from the sendfile call.
24	- implement aio_msync, aio_mtouch.
25	- (libeio) tentatively support darwin in sendfile.
26
27	3.31 Thu Nov 12 02:14:29 CET 2009
28	- fix result status documentation of aio_copy, aio_move.
29	- speed up object creation considerably by avoiding
30	hash lookups.
31
32	3.3 Wed Aug 5 13:52:58 CEST 2009
33	- use common::sense.
34	- use common schmorp.h header.
35	- allow integers (file descriptors) in addition to file handles.
36	- take advantage of linux' eventfd (but it seems slower on smp?).
37	- use poll not select on posix platforms.
38
39	3.261 Wed Jul 1 10:11:51 CEST 2009
40	- more 0S X workarounds (patch by Tokuhiro Matsuno).
41
42	3.26 Tue Jun 30 09:33:26 CEST 2009
43	- 0S X of course claims to be posix 2008 but lacks posix_fadvise.
44	try to work around this horribly broken OS in a somewhat hackish
45	way. might help other os's too.
46
47	3.25 Sat Jun 27 05:18:26 CEST 2009
48	- added IO::AIO::fadvise and IO::AIO::sendfile.
49	- (libeio) replaced quicksort+insertion sort by a tuned radix
50	sort + insertion sort, resulting in comparable runtime (usually
51	faster) to the old version, but without any ill side effects on
52	degenerated (for quicksort) data.
53	- (libeio) correctly sort dirs by inodes if we have perfect type
54	knowledge and DIRS_FIRST is used.
55	- (libeio) internally the wrong DT_* constants were used, but no
56	known system has differing EIO_DT_/DT_ values, so not an issue.
57	- removed a (harmless) assert that was left over on the code
58	but should not have been.
59	- use more correct types (change IO length from IV to VAL64,
60	which makes a difference on systems without 64 bit perls).
61
62	3.23 Sat Jun 13 16:57:58 CEST 2009
63	- fix off-by-one bug in aio_readdir that was introduced in the
64	rushed 3.22 release.
65
66	3.22 Sat Jun 13 15:32:40 CEST 2009
67	- speed up readdirx sort algorithm slightly.
68	- bin/treescan was missing from distro tarball.
69
70	3.21 Fri Jun 12 18:45:53 CEST 2009
71	- new options --dirs and --files for treescan.
72	- install bin/treescan by default.
73	- (libeio) aio_readdir can now be cancelled while executing.
74	- fix a printf format string for 64 bit systems (could lead
75	to problems on big endian 64 bit systems).
76	- do not use qsort() but our own algorithm: glibc initialises
77	the whole locale and I/O subsystem inside qsort, causing
78	a stack overflow on 32 bit machines. The new sort uses much less
79	stack and is more than twice as fast in typical situations.
80
81	3.2 Sun Jun 7 20:30:05 CEST 2009
82	- (libeio) pwrite emulation was even more flawed than intended and did
83	not restore the file offset.
84	- add aio_readdirx, which can return inode and filetype and sort
85	the names in various ways.
86	- unfortunately, utime, chmod, chown on an open file that has just
87	been written can easily block, which caused aio_copy to block the
88	process. no more!
89	- no longer rely on dst path in aio_copy when futime is available.
90
91	3.19 Tue Apr 21 22:05:21 CEST 2009
92	- more perl 5.10 workarounds for aio_read and write.
93	- aio_write no longer modifies the sv (if possible).
94	- aio_read now works correctly with magic values.
95
96	3.18 Sun Apr 19 21:17:32 CEST 2009
97	- better diagnostics when some aio_* functions get passed an illegal fh.
98	- try to avoid crashes due to incompatible 5.10 API changes. grmbl.
99
100	3.17 Thu Nov 20 08:45:36 CET 2008
101	- (libeio) added aio_sync_file_range (untested).
102	- add aio_busy to @IO::AIO::AIO_REQ.
103
104	3.16 Wed Oct 22 18:28:01 CEST 2008
105	- use SvREFCNT_inc instead of SvREFCNT_inc_NN in a non-speed critical
106	part to improve portability to perl 5.8 (reported by szymon).
107
108	3.15 Mon Oct 13 00:39:55 CEST 2008
109	- automatic removal of feeders was broken.
110	- (libeio) use a more robust method to detect whether a feeder
111	has added something to the group or not.
112
113	3.1 Thu Oct 2 13:34:40 CEST 2008
114	- pre-deref the passed callback object, for increased speed
115	and decreased memory usage.
116	- call on_next_submit callback even for aio_group - impact unknown,
117	but seems more correct.
118	- $req->cb now returns the original callback.
119	- (libeio) pass EIO_GROUP/aio_group requests through the queue without
120	requiring a thread switch.
121	- (libeio) status code of aio_futime and aio_utime was always passed 0.
122	- do some other µ-optimisations.
123
124	3.07 Sat Aug 2 16:06:13 CEST 2008
125	- do not include LIBS in autoconf tests.
126
127	3.06 Tue Jul 15 12:41:32 CEST 2008
128	- move preadwritelock definition before it's first reference,
129	to make it compile again on broken platforms (they still exist)
130	or badly cofngiured perls (redhat...), reported by Rob Bloodgood.
131
132	3.05 Thu Jun 19 23:23:52 CEST 2008
133	- work around perl overriding readdir etc. with thread-unsafe
134	(sic!) versions.
135
136	3.04 Wed Jun 18 01:35:38 CEST 2008
137	- (libeio) fix eio_mknod, which confused it's arguments.
138	- (libeio) do not use readdir_r, as Ulrich Drepper pointed out that this
139	is stupid.
140	- (libeio) fix eio__readahead prototype, patch by Jost Krieger.
141	- (libeio) fix a bug that could potentially cause IO::AIO
142	not to get initialised properly.
143
144	3.03 Thu May 29 05:33:30 CEST 2008
145	- (libeio) correctly call pthread_attr_destroy ().
146	- (libeio) work around broken bsd headers once more.
147	- reduce shared library size again by not including wrappers.
148	- max_outstanding could cause poll to enter a busy-waiting loop.
149	- document the new IO::AIO::poll_cb result value.
150
151	3.02 Mon May 12 02:32:02 CEST 2008
152	- fix a memory leak on aio_readlink.
153	- bring back working fchmod.
154	- nop and busy now set result to 0.
155	- set errno to ENOMEM when allocation fails.
156
157	3.01 Sun May 11 03:07:03 CEST 2008
158	- (libeio) make it compile on systems without readahead or readdir_r.
159	- (libeio) improve configure check for readahead availability.
160	- do not try to link against -lrt.
161	- use a separate configure script for IO::AIO (not the libeio one).
162
163	3.0 Sun May 11 00:57:14 CEST 2008
164	- added bin/treescan to the distribution.
165	- switched to using libeio.
166	- LOTS OF INCOMPATIBLE CHANGES:
167	- remove signal functionality, it is not worth the effort.
168	- max_outstanding no longer returns the previous number of requests.
169	- poll_cb no longer returns number of requests.
170
171	2.62 Sat Apr 26 13:59:33 CEST 2008
172	- port to solaris perls configured for old posix
173	(analysed by Jost Krieger).
174	- keep a reference to the perl filehandle object in aio_close,
175	so it doesn't get closed prematurely, leading to ugly races.
176
177	2.61 Wed Apr 16 18:45:02 CEST 2008
178	- fix treescan output duplication and improve output ordering.
179	also display files given on the commandline.
180	- use a different algorithm for aio_close that is faster
181	and probably has even lower chances of blocking.
182	- do our own stack memory management for threads - linux
183	allocates outrageous amounts of VM (not so bad unless you
184	use mlockall...), which severely limits the number of threads
185	on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
186	and 4096 * sizeof (long) (usually this is 16..64k).
187
188	2.6 Sun Mar 30 08:28:11 CEST 2008
189	- added aio_sync.
190	- added aio_pathsync.
191	- fix prototypes of (void) functions.
192
193	2.51 Sat Oct 6 16:04:54 CEST 2007
194	- perlio isn't generally threadsafe, so aio_close could not work reliably.
195	aio_close now tries a safe hack that might not be that asynchronous
196	(see the manpage for details).
197	- discard callback return values as to not grow the stack endlessly
198	when poll_cb handles many requests without returning.
199	- minor code cleanups.
200
201	2.5 Thu Oct 4 14:49:08 CEST 2007
202	- replaced _fd2fh with faster xs code.
203	- aio_close will now try to do "the right thing" and thus might
204	work sensibly for the very first time.
205
206	2.41 Mon Sep 24 21:28:21 CEST 2007
207	- after fork, invest some work to make sure that the poll_fileno
208	stays stable (by dup2'ing the new fd over the old one), to make
209	it easier for programs/libs that don't control their forking
210	behaviour and cannot recreate their watchers.
211
212	2.4 Sun Aug 5 18:44:22 CEST 2007
213	- add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
214	successfully demonstrated that you can block on futimes...).
215	- allow undef as fileoffset for aio_read/write and use read/write(2)
216	internally (useful for sockets or O_APPEND handles).
217	- allow undef for length in aio_write.
218	- negative dataoffsets work as expected now in aio_read/aio_write.
219	- use NV instead of UV for 32 bit perls and file offsets, as NVs
220	have a larger range then.
221	- shared code between BDB and IO::AIO.
222	- aio_busy was completely broken. now fixed.
223	- readahead emulation now returns something.
224	- correctly set errno to ENOSYS on unimplemented functions
225	(should never happen, though).
226	- large changes to make it partially compile and run on win32,
227	but win32 lacks too much functionality, and perl overrides way
228	too many functions with crashing versions.
229
230	2.33 Tue Jan 23 23:55:41 CET 2007
231	- fix install path (Andreas J. Koenig).
232
233	2.32 Mon Jan 22 16:56:23 CET 2007
234	- added aio_rmtree.
235	- wow, aio_mkdir was missing.
236	- aio_load did return undef on error, not -1.
237	- use prefixexp not prefix in autoconf.pm
238	(suggested by ... rt.cpan.org unreachable).
239	- avoid installing autoconf.pm.
240
241	2.31 Sat Jan 6 03:46:02 CET 2007
242	- added aio_load.
243
244	2.3 Sat Dec 23 05:48:07 CET 2006
245	- fix off-by-one bug in aio_read, causing memory corruption
246	or crashes.
247
248	2.21 Fri Dec 22 05:03:38 CET 2006
249	- minor doc updates.
250	- minor cleanups.
251	- IO::AIO::poll returns request count.
252	- undocumented and unfinished async-signal-reporting.
253
254	2.2 Tue Oct 31 00:31:00 CET 2006
255	- minor doc updates.
256	- added aio_readlink.
257	- properly zero-terminate aio_read buffer.
258	- fix aio_read/write with nonzero dataoffset.
259	- reduced size of aio request structure.
260	- better diagnostics when pathnames etc. are not byte-encoded;
261	do not leak request in that case, either.
262
263	2.1 Sun Oct 29 02:01:57 CET 2006
264	- INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
265	IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
266	- fix a bug in aio_move where it would fail everytime
267	it would have to copy files manually.
268	- doc updates.
269	- start threads only on (very low) demand.
270	- end superfluous threads automatically after 10s idling.
271	- add IO::AIO::max_idle to control this.
272	- some tuning applied to random places.
273	- add aio_mknod.
274
275	2.0 Thu Oct 26 18:27:58 CEST 2006
276	- minor incompatibility: max_outstanding semantics have changed.
277	- major rewrite, consider all functionality EXPERIMENTAL.
278	- aio requests can be cancelled.
279	- callbacks can be (re-)set later.
280	- aio requests can choose between 9 priorities.
281	- add aio_group: aio requests can be grouped
282	into composite requests.
283	- generator interface for groups.
284	- add IO::AIO::poll_some.
285	- major documentation improvements.
286	- very minor bugfixes.
287	- add aio_nop for dummy requests.
288	- add aio_busy mainly for benchmarking and debugging.
289	- use "fast" mutexes on linux.
290	- use dynamic (and larger) buffers instead of
291	putting them onto the stack.
292	- optimise x86 and amd64 a bit.
293	- better error checking when ENOMEM.
294	- hopefully fix mem and dirp leaks on fork.
295	- warn about broken perl malloc.
296	- compiles on cygwin (but pread is broken on cygwin
297	which is not detected by autoconf, so you have to
298	edit autoconf/config.h yourself to enable emulation).
299
300	1.8 Sat Jun 24 22:20:44 CEST 2006
301	- add and/or document aio_rename, aio_link, aio_symlink and aio_move.
302
303	1.73 Wed Mar 1 22:49:32 CET 2006
304	- codename "jost"
305	- AIX/Solaris(?) aren't being helpful again, hardcode a value
306	for NAME_MAX and drive with your eyes closed (reported by
307	wcooley@nakedape.cc).
308
309	1.72 Thu Feb 2 00:40:44 CET 2006
310	- another minor bug in aio_scandir, again, the callback was called
311	twice when the directory can't be stat'ed.
312
313	1.71 Mon Dec 26 20:20:03 CET 2005
314	- grr, another minor bug in aio_scandir, this time resulting
315	in a runtime error.
316
317	1.7 Mon Dec 26 19:29:48 CET 2005
318	- aio_scandir errornously called callback twice in some cases.
319	- added AnyEvent example.
320
321	1.61 Wed Sep 7 19:40:42 CEST 2005
322	- no longer include $Config{libs}, as distros include too much
323	garbage in there that is not installed on typical systems
324	(for example, debian links perl against -lgdbm and many more
325	libraries despite perl not needing it, slowing down startup and
326	wasting memory).
327
328	1.6 Tue Aug 30 17:44:44 CEST 2005
329	- added aio_readdir, aio_scandir.
330	- added aio_sendfile, including sendfile emulation when sendfile
331	isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
332	support is unavailable on my solaris 8 machine, but preliminary
333	code is there. What's lacking is configury stuff and testing...).
334
335	1.5 Sat Aug 20 02:32:19 CEST 2005
336	- create the aio threads on demand only (good after forking).
337	- somebody nagged about C89 compatibility, so this release should
338	be C89 compatible, but no guarantees for future ones.
339	- abort when the configure script fails.
340
341	1.4 Wed Aug 17 08:07:27 CEST 2005
342	- forgot to recreate the pipe after forking, this could cause
343	deadlocks.
344
345	1.3 Wed Aug 17 07:25:54 CEST 2005
346	- properly propagate exceptions from callbacks, instead of silently
347	eating them.
348	- use a different fork algorithm that avoids recursive callback
349	invocations and reduces fork latency in busy processes.
350	- fix a bug where the buffer scalar in aio_read got assigned the wrong
351	length after reading.
352	- fix a bug where the child would process some outstanding requests
353	from the parent.
354	- make a copy of the callback scalar, to avoid some very uncommon
355	(but valid) usages where the callback scalar changes.
356	- the callback was never freed in aio_read/aio_write.
357	- aio_read/aio_write will now set the readonly flag on the data
358	scalar for better error reporting.
359
360	1.2 Wed Aug 17 01:22:58 CEST 2005
361	- verified on cygwin, linux/amd64+ia32+alpha, solaris.
362	- use SvPVbyte for filenames now. You need to encode your strings to
363	the external filename encoding first.
364	- fix the bug where filehandles could leak (again).
365	- clarify freebsd situation: make it work and tell me how, or go away
366	with your underdocumented, broken and outdated OS.
367	- fork'ing should now be officially supported (where linux and
368	posix contradict each other, I followed posix).
369	- only call read() once per poll, not twice (speedup).
370	- new functions: aio_rmdir, aio_symlink.
371	- force callback arguments to be undef or a reference, for better
372	error catching.
373
374	1.1 Sun Aug 7 05:27:23 CEST 2005
375	- added configure script to detect availability of some calls.
376	(imperfect, as we cannot detect things like -lrt due to missing
377	feedback yet).
378	- emulate fdatasync via fsync, pread/pwrite via unsafe read/write
379	and readahead via manual reading on platforms lacking those.
380	- ported t/03_errors.t+framework by Brad Fitzpatrick
381	from Linux::AIO.
382	- removed XOPEN_SOURCE because stupid solaris 9 doesn't
383	compile with it enabled. Probably breaks others. Oh well.
384	- try to be more careful with errno on non-threaded perls.
385	- cygwins perl insisted on a matching open mode when morphing
386	the fd to an fh.
387	- convert sv's to "byte" encoding in aio_read/aio_write. Might
388	do that for pathnames, too, in the future, so make sure you
389	properly encode your pathnames.
390
391	1.0 Fri Jul 22 10:43:30 CEST 2005
392	- aio_open did not reliably deliver (open) filehandles.
393	- all aio_*-functions keep a reference to the filehandle so
394	it doesn't go away while the aio requests is working on it.
395	- disable warnings in AIO.pm.
396
397	0.9 Wed Jul 20 23:55:04 CEST 2005
398	- allow recursive calls to poll_cb, use less locking calls, too.
399	- fix the Gtk2-example in the SYNOPSIS.
400	- use pread/pwrite not pread64/pwrite64. this was simply a leftover
401	from Linux::AIO.
402	(found by compiling on cygwin. Unfortunately, cygwin declares but
403	does not implement pread/pwrite).
404	- only include <sys/syscall.h> on linux.
405
406	0.5 Tue Jul 12 13:03:09 CEST 2005
407	- removed #include <endian.h>, it's not portable, and we don't
408	need it anyway.
409	- link against -lrt, as it might contain goodies such as fdatasync,
410	and often aio_read, which we do not use yet, but it shouldn't hurt.
411
412	0.4 Mon Jul 11 05:28:25 CEST 2005
413	- added IO::AIO::flush, IO::AIO::poll.
414	- make callback argument optional for all calls.
415
416	0.3 Mon Jul 11 01:42:37 CEST 2005
417	- restructured manpage.
418	- added SYNOPSIS with examples for Event, Glib, Tk.
419	- remove explicit context support so I don't have to maintain
420	it for threaded perls (i.e. it should work now :).
421
422	0.2 Sun Jul 10 22:57:12 CEST 2005
423	- return immediately from poll_wait if nreqs==0.
424	- get rid of the request pipe and use faster thread-thread
425	communications for most requests and responses.
426
427	0.1
428	- cloned from Linux::AIO, which is very similar.
429