[ViewVC] Annotation 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?

        - (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:	1.212
Committed:	Sat Jan 2 14:11:32 2010 UTC (14 years, 5 months ago) by root
Branch:	MAIN
Changes since 1.211:	+2 -0 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.31	Revision history for IO::AIO
2	root	1.30
3	root	1.59	TODO: better autoconf.pm that can return LIBS etc.
4	root	1.114	TODO: aio_cptree/mvtree
5	root	1.106	TODO: reduce condvar fairness: schedule hot-cache-threads first?
6	root	1.176	TODO: splice/tee/vmsplice? (http://kerneltrap.org/node/6505 http://lwn.net/Articles/178199/)
7	root	1.136	TODO: aio_fcntl, at least for file-locking
8	root	1.196	TODO: fallocate, if it wouldn't be so useless.
9	root	1.212	TODO: IO::AIO::mmap? aio_mincore?
10	root	1.100
11	root	1.209	- (libeio) max_poll_time was not properly converted to ticks.
12			- clarify cancel_subs description.
13	root	1.210	- IO::AIO::sendfile did not actually return the return value
14			from the sendfile call.
15	root	1.212	- implement aio_msync, aio_mtouch.
16	root	1.211	- (libeio) tentatively support darwin in sendfile.
17	root	1.209
18	root	1.208	3.31 Thu Nov 12 02:14:29 CET 2009
19	root	1.206	- fix result status documentation of aio_copy, aio_move.
20	root	1.207	- speed up object creation considerably by avoiding
21			hash lookups.
22	root	1.206
23	root	1.205	3.3 Wed Aug 5 13:52:58 CEST 2009
24	root	1.202	- use common::sense.
25			- use common schmorp.h header.
26			- allow integers (file descriptors) in addition to file handles.
27	root	1.203	- take advantage of linux' eventfd (but it seems slower on smp?).
28	root	1.204	- use poll not select on posix platforms.
29	root	1.202
30	root	1.201	3.261 Wed Jul 1 10:11:51 CEST 2009
31	root	1.207	- more 0S X workarounds (patch by Tokuhiro Matsuno).
32	root	1.200
33	root	1.199	3.26 Tue Jun 30 09:33:26 CEST 2009
34	root	1.207	- 0S X of course claims to be posix 2008 but lacks posix_fadvise.
35			try to work around this horribly broken OS in a somewhat hackish
36			way. might help other os's too.
37	root	1.199
38	root	1.198	3.25 Sat Jun 27 05:18:26 CEST 2009
39	root	1.197	- added IO::AIO::fadvise and IO::AIO::sendfile.
40	root	1.195	- (libeio) replaced quicksort+insertion sort by a tuned radix
41			sort + insertion sort, resulting in comparable runtime (usually
42			faster) to the old version, but without any ill side effects on
43			degenerated (for quicksort) data.
44			- (libeio) correctly sort dirs by inodes if we have perfect type
45	root	1.194	knowledge and DIRS_FIRST is used.
46	root	1.195	- (libeio) internally the wrong DT_* constants were used, but no
47			known system has differing EIO_DT_/DT_ values, so not an issue.
48			- removed a (harmless) assert that was left over on the code
49			but should not have been.
50	root	1.196	- use more correct types (change IO length from IV to VAL64,
51			which makes a difference on systems without 64 bit perls).
52	root	1.194
53	root	1.193	3.23 Sat Jun 13 16:57:58 CEST 2009
54			- fix off-by-one bug in aio_readdir that was introduced in the
55			rushed 3.22 release.
56
57	root	1.192	3.22 Sat Jun 13 15:32:40 CEST 2009
58	root	1.191	- speed up readdirx sort algorithm slightly.
59	root	1.192	- bin/treescan was missing from distro tarball.
60	root	1.191
61	root	1.190	3.21 Fri Jun 12 18:45:53 CEST 2009
62	root	1.187	- new options --dirs and --files for treescan.
63	root	1.188	- install bin/treescan by default.
64	root	1.189	- (libeio) aio_readdir can now be cancelled while executing.
65	root	1.190	- fix a printf format string for 64 bit systems (could lead
66			to problems on big endian 64 bit systems).
67			- do not use qsort() but our own algorithm: glibc initialises
68			the whole locale and I/O subsystem inside qsort, causing
69			a stack overflow on 32 bit machines. The new sort uses much less
70			stack and is more than twice as fast in typical situations.
71	root	1.187
72	root	1.186	3.2 Sun Jun 7 20:30:05 CEST 2009
73	root	1.182	- (libeio) pwrite emulation was even more flawed than intended and did
74			not restore the file offset.
75	root	1.183	- add aio_readdirx, which can return inode and filetype and sort
76			the names in various ways.
77	root	1.182	- unfortunately, utime, chmod, chown on an open file that has just
78			been written can easily block, which caused aio_copy to block the
79			process. no more!
80			- no longer rely on dst path in aio_copy when futime is available.
81
82	root	1.181	3.19 Tue Apr 21 22:05:21 CEST 2009
83			- more perl 5.10 workarounds for aio_read and write.
84			- aio_write no longer modifies the sv (if possible).
85			- aio_read now works correctly with magic values.
86
87	root	1.180	3.18 Sun Apr 19 21:17:32 CEST 2009
88	root	1.179	- better diagnostics when some aio_* functions get passed an illegal fh.
89	root	1.180	- try to avoid crashes due to incompatible 5.10 API changes. grmbl.
90	root	1.178
91	root	1.177	3.17 Thu Nov 20 08:45:36 CET 2008
92	root	1.176	- (libeio) added aio_sync_file_range (untested).
93	root	1.177	- add aio_busy to @IO::AIO::AIO_REQ.
94	root	1.175
95	root	1.174	3.16 Wed Oct 22 18:28:01 CEST 2008
96	root	1.173	- use SvREFCNT_inc instead of SvREFCNT_inc_NN in a non-speed critical
97			part to improve portability to perl 5.8 (reported by szymon).
98
99	root	1.172	3.15 Mon Oct 13 00:39:55 CEST 2008
100	root	1.171	- automatic removal of feeders was broken.
101			- (libeio) use a more robust method to detect whether a feeder
102			has added something to the group or not.
103
104	root	1.170	3.1 Thu Oct 2 13:34:40 CEST 2008
105	root	1.168	- pre-deref the passed callback object, for increased speed
106			and decreased memory usage.
107	root	1.167	- call on_next_submit callback even for aio_group - impact unknown,
108	root	1.166	but seems more correct.
109	root	1.168	- $req->cb now returns the original callback.
110	root	1.166	- (libeio) pass EIO_GROUP/aio_group requests through the queue without
111			requiring a thread switch.
112	root	1.169	- (libeio) status code of aio_futime and aio_utime was always passed 0.
113	root	1.166	- do some other µ-optimisations.
114
115	root	1.165	3.07 Sat Aug 2 16:06:13 CEST 2008
116			- do not include LIBS in autoconf tests.
117
118	root	1.164	3.06 Tue Jul 15 12:41:32 CEST 2008
119	root	1.162	- move preadwritelock definition before it's first reference,
120	root	1.164	to make it compile again on broken platforms (they still exist)
121			or badly cofngiured perls (redhat...), reported by Rob Bloodgood.
122	root	1.162
123	root	1.161	3.05 Thu Jun 19 23:23:52 CEST 2008
124	root	1.160	- work around perl overriding readdir etc. with thread-unsafe
125	root	1.161	(sic!) versions.
126	root	1.160
127	root	1.159	3.04 Wed Jun 18 01:35:38 CEST 2008
128			- (libeio) fix eio_mknod, which confused it's arguments.
129	root	1.158	- (libeio) do not use readdir_r, as Ulrich Drepper pointed out that this
130			is stupid.
131	root	1.159	- (libeio) fix eio__readahead prototype, patch by Jost Krieger.
132			- (libeio) fix a bug that could potentially cause IO::AIO
133			not to get initialised properly.
134	root	1.158
135	root	1.157	3.03 Thu May 29 05:33:30 CEST 2008
136	root	1.153	- (libeio) correctly call pthread_attr_destroy ().
137	root	1.155	- (libeio) work around broken bsd headers once more.
138	root	1.154	- reduce shared library size again by not including wrappers.
139	root	1.156	- max_outstanding could cause poll to enter a busy-waiting loop.
140			- document the new IO::AIO::poll_cb result value.
141	root	1.153
142	root	1.152	3.02 Mon May 12 02:32:02 CEST 2008
143	root	1.150	- fix a memory leak on aio_readlink.
144			- bring back working fchmod.
145	root	1.151	- nop and busy now set result to 0.
146			- set errno to ENOMEM when allocation fails.
147	root	1.150
148	root	1.149	3.01 Sun May 11 03:07:03 CEST 2008
149			- (libeio) make it compile on systems without readahead or readdir_r.
150	root	1.148	- (libeio) improve configure check for readahead availability.
151			- do not try to link against -lrt.
152	root	1.147	- use a separate configure script for IO::AIO (not the libeio one).
153
154	root	1.146	3.0 Sun May 11 00:57:14 CEST 2008
155	root	1.145	- added bin/treescan to the distribution.
156			- switched to using libeio.
157			- LOTS OF INCOMPATIBLE CHANGES:
158			- remove signal functionality, it is not worth the effort.
159			- max_outstanding no longer returns the previous number of requests.
160			- poll_cb no longer returns number of requests.
161	root	1.143
162	root	1.142	2.62 Sat Apr 26 13:59:33 CEST 2008
163	root	1.141	- port to solaris perls configured for old posix
164			(analysed by Jost Krieger).
165	root	1.142	- keep a reference to the perl filehandle object in aio_close,
166			so it doesn't get closed prematurely, leading to ugly races.
167	root	1.141
168	root	1.140	2.61 Wed Apr 16 18:45:02 CEST 2008
169	root	1.137	- fix treescan output duplication and improve output ordering.
170			also display files given on the commandline.
171	root	1.140	- use a different algorithm for aio_close that is faster
172			and probably has even lower chances of blocking.
173	root	1.138	- do our own stack memory management for threads - linux
174			allocates outrageous amounts of VM (not so bad unless you
175			use mlockall...), which severely limits the number of threads
176	root	1.139	on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
177			and 4096 * sizeof (long) (usually this is 16..64k).
178	root	1.137
179	root	1.136	2.6 Sun Mar 30 08:28:11 CEST 2008
180	root	1.134	- added aio_sync.
181	root	1.135	- added aio_pathsync.
182	root	1.136	- fix prototypes of (void) functions.
183	root	1.134
184	root	1.133	2.51 Sat Oct 6 16:04:54 CEST 2007
185			- perlio isn't generally threadsafe, so aio_close could not work reliably.
186			aio_close now tries a safe hack that might not be that asynchronous
187			(see the manpage for details).
188			- discard callback return values as to not grow the stack endlessly
189			when poll_cb handles many requests without returning.
190			- minor code cleanups.
191
192	root	1.132	2.5 Thu Oct 4 14:49:08 CEST 2007
193	root	1.131	- replaced _fd2fh with faster xs code.
194			- aio_close will now try to do "the right thing" and thus might
195			work sensibly for the very first time.
196
197	root	1.130	2.41 Mon Sep 24 21:28:21 CEST 2007
198	root	1.129	- after fork, invest some work to make sure that the poll_fileno
199			stays stable (by dup2'ing the new fd over the old one), to make
200			it easier for programs/libs that don't control their forking
201			behaviour and cannot recreate their watchers.
202
203	root	1.128	2.4 Sun Aug 5 18:44:22 CEST 2007
204	root	1.127	- add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
205			successfully demonstrated that you can block on futimes...).
206	root	1.124	- allow undef as fileoffset for aio_read/write and use read/write(2)
207			internally (useful for sockets or O_APPEND handles).
208	root	1.126	- allow undef for length in aio_write.
209			- negative dataoffsets work as expected now in aio_read/aio_write.
210	root	1.124	- use NV instead of UV for 32 bit perls and file offsets, as NVs
211	root	1.125	have a larger range then.
212	root	1.120	- shared code between BDB and IO::AIO.
213	root	1.127	- aio_busy was completely broken. now fixed.
214			- readahead emulation now returns something.
215	root	1.121	- correctly set errno to ENOSYS on unimplemented functions
216			(should never happen, though).
217	root	1.127	- large changes to make it partially compile and run on win32,
218			but win32 lacks too much functionality, and perl overrides way
219			too many functions with crashing versions.
220	root	1.120
221	root	1.119	2.33 Tue Jan 23 23:55:41 CET 2007
222			- fix install path (Andreas J. Koenig).
223
224	root	1.118	2.32 Mon Jan 22 16:56:23 CET 2007
225	root	1.114	- added aio_rmtree.
226	root	1.115	- wow, aio_mkdir was missing.
227	root	1.116	- aio_load did return undef on error, not -1.
228	root	1.117	- use prefixexp not prefix in autoconf.pm
229			(suggested by ... rt.cpan.org unreachable).
230	root	1.118	- avoid installing autoconf.pm.
231	root	1.114
232	root	1.113	2.31 Sat Jan 6 03:46:02 CET 2007
233	root	1.112	- added aio_load.
234
235	root	1.111	2.3 Sat Dec 23 05:48:07 CET 2006
236			- fix off-by-one bug in aio_read, causing memory corruption
237			or crashes.
238
239	root	1.110	2.21 Fri Dec 22 05:03:38 CET 2006
240	root	1.108	- minor doc updates.
241	root	1.107	- minor cleanups.
242			- IO::AIO::poll returns request count.
243	root	1.109	- undocumented and unfinished async-signal-reporting.
244	root	1.107
245	root	1.103	2.2 Tue Oct 31 00:31:00 CET 2006
246	root	1.100	- minor doc updates.
247	root	1.101	- added aio_readlink.
248			- properly zero-terminate aio_read buffer.
249			- fix aio_read/write with nonzero dataoffset.
250	root	1.104	- reduced size of aio request structure.
251	root	1.106	- better diagnostics when pathnames etc. are not byte-encoded;
252	root	1.105	do not leak request in that case, either.
253	root	1.94
254	root	1.99	2.1 Sun Oct 29 02:01:57 CET 2006
255	root	1.98	- INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
256			IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
257	root	1.95	- fix a bug in aio_move where it would fail everytime
258			it would have to copy files manually.
259	root	1.98	- doc updates.
260	root	1.94	- start threads only on (very low) demand.
261	root	1.97	- end superfluous threads automatically after 10s idling.
262	root	1.98	- add IO::AIO::max_idle to control this.
263	root	1.94	- some tuning applied to random places.
264	root	1.95	- add aio_mknod.
265	root	1.59
266	root	1.92	2.0 Thu Oct 26 18:27:58 CEST 2006
267	root	1.90	- minor incompatibility: max_outstanding semantics have changed.
268	root	1.86	- major rewrite, consider all functionality EXPERIMENTAL.
269	root	1.68	- aio requests can be cancelled.
270	root	1.81	- callbacks can be (re-)set later.
271	root	1.93	- aio requests can choose between 9 priorities.
272	root	1.83	- add aio_group: aio requests can be grouped
273			into composite requests.
274			- generator interface for groups.
275	root	1.89	- add IO::AIO::poll_some.
276	root	1.72	- major documentation improvements.
277			- very minor bugfixes.
278	root	1.76	- add aio_nop for dummy requests.
279	root	1.84	- add aio_busy mainly for benchmarking and debugging.
280	root	1.79	- use "fast" mutexes on linux.
281	root	1.80	- use dynamic (and larger) buffers instead of
282			putting them onto the stack.
283			- optimise x86 and amd64 a bit.
284			- better error checking when ENOMEM.
285	root	1.85	- hopefully fix mem and dirp leaks on fork.
286	root	1.92	- warn about broken perl malloc.
287	root	1.88	- compiles on cygwin (but pread is broken on cygwin
288			which is not detected by autoconf, so you have to
289			edit autoconf/config.h yourself to enable emulation).
290	root	1.68
291	root	1.67	1.8 Sat Jun 24 22:20:44 CEST 2006
292	root	1.66	- add and/or document aio_rename, aio_link, aio_symlink and aio_move.
293
294	root	1.65	1.73 Wed Mar 1 22:49:32 CET 2006
295			- codename "jost"
296			- AIX/Solaris(?) aren't being helpful again, hardcode a value
297			for NAME_MAX and drive with your eyes closed (reported by
298			wcooley@nakedape.cc).
299	root	1.63
300	root	1.62	1.72 Thu Feb 2 00:40:44 CET 2006
301	root	1.61	- another minor bug in aio_scandir, again, the callback was called
302			twice when the directory can't be stat'ed.
303
304	root	1.60	1.71 Mon Dec 26 20:20:03 CET 2005
305			- grr, another minor bug in aio_scandir, this time resulting
306			in a runtime error.
307
308	root	1.59	1.7 Mon Dec 26 19:29:48 CET 2005
309	root	1.58	- aio_scandir errornously called callback twice in some cases.
310	root	1.57	- added AnyEvent example.
311
312	root	1.55	1.61 Wed Sep 7 19:40:42 CEST 2005
313	root	1.54	- no longer include $Config{libs}, as distros include too much
314	root	1.56	garbage in there that is not installed on typical systems
315	root	1.54	(for example, debian links perl against -lgdbm and many more
316			libraries despite perl not needing it, slowing down startup and
317			wasting memory).
318
319	root	1.53	1.6 Tue Aug 30 17:44:44 CEST 2005
320			- added aio_readdir, aio_scandir.
321	root	1.51	- added aio_sendfile, including sendfile emulation when sendfile
322			isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
323			support is unavailable on my solaris 8 machine, but preliminary
324			code is there. What's lacking is configury stuff and testing...).
325	root	1.46
326	root	1.44	1.5 Sat Aug 20 02:32:19 CEST 2005
327	root	1.51	- create the aio threads on demand only (good after forking).
328	root	1.41	- somebody nagged about C89 compatibility, so this release should
329	root	1.42	be C89 compatible, but no guarantees for future ones.
330	root	1.43	- abort when the configure script fails.
331	root	1.41
332	root	1.40	1.4 Wed Aug 17 08:07:27 CEST 2005
333	root	1.93	- forgot to recreate the pipe after forking, this could cause
334	root	1.40	deadlocks.
335
336	root	1.39	1.3 Wed Aug 17 07:25:54 CEST 2005
337	root	1.33	- properly propagate exceptions from callbacks, instead of silently
338			eating them.
339	root	1.38	- use a different fork algorithm that avoids recursive callback
340			invocations and reduces fork latency in busy processes.
341	root	1.37	- fix a bug where the buffer scalar in aio_read got assigned the wrong
342			length after reading.
343			- fix a bug where the child would process some outstanding requests
344			from the parent.
345			- make a copy of the callback scalar, to avoid some very uncommon
346			(but valid) usages where the callback scalar changes.
347			- the callback was never freed in aio_read/aio_write.
348	root	1.38	- aio_read/aio_write will now set the readonly flag on the data
349			scalar for better error reporting.
350	root	1.33
351	root	1.32	1.2 Wed Aug 17 01:22:58 CEST 2005
352			- verified on cygwin, linux/amd64+ia32+alpha, solaris.
353	root	1.31	- use SvPVbyte for filenames now. You need to encode your strings to
354			the external filename encoding first.
355	root	1.32	- fix the bug where filehandles could leak (again).
356	root	1.31	- clarify freebsd situation: make it work and tell me how, or go away
357			with your underdocumented, broken and outdated OS.
358			- fork'ing should now be officially supported (where linux and
359			posix contradict each other, I followed posix).
360	root	1.32	- only call read() once per poll, not twice (speedup).
361			- new functions: aio_rmdir, aio_symlink.
362	root	1.31	- force callback arguments to be undef or a reference, for better
363			error catching.
364	root	1.1
365	root	1.29	1.1 Sun Aug 7 05:27:23 CEST 2005
366	root	1.25	- added configure script to detect availability of some calls.
367	root	1.27	(imperfect, as we cannot detect things like -lrt due to missing
368	root	1.23	feedback yet).
369	root	1.27	- emulate fdatasync via fsync, pread/pwrite via unsafe read/write
370			and readahead via manual reading on platforms lacking those.
371	root	1.19	- ported t/03_errors.t+framework by Brad Fitzpatrick
372			from Linux::AIO.
373	root	1.18	- removed XOPEN_SOURCE because stupid solaris 9 doesn't
374			compile with it enabled. Probably breaks others. Oh well.
375	root	1.24	- try to be more careful with errno on non-threaded perls.
376	root	1.26	- cygwins perl insisted on a matching open mode when morphing
377			the fd to an fh.
378	root	1.28	- convert sv's to "byte" encoding in aio_read/aio_write. Might
379			do that for pathnames, too, in the future, so make sure you
380			properly encode your pathnames.
381	root	1.18
382	root	1.17	1.0 Fri Jul 22 10:43:30 CEST 2005
383			- aio_open did not reliably deliver (open) filehandles.
384	root	1.16	- all aio_*-functions keep a reference to the filehandle so
385			it doesn't go away while the aio requests is working on it.
386			- disable warnings in AIO.pm.
387
388	root	1.15	0.9 Wed Jul 20 23:55:04 CEST 2005
389			- allow recursive calls to poll_cb, use less locking calls, too.
390			- fix the Gtk2-example in the SYNOPSIS.
391	root	1.14	- use pread/pwrite not pread64/pwrite64. this was simply a leftover
392			from Linux::AIO.
393			(found by compiling on cygwin. Unfortunately, cygwin declares but
394			does not implement pread/pwrite).
395			- only include <sys/syscall.h> on linux.
396
397	root	1.13	0.5 Tue Jul 12 13:03:09 CEST 2005
398	root	1.12	- removed #include <endian.h>, it's not portable, and we don't
399			need it anyway.
400			- link against -lrt, as it might contain goodies such as fdatasync,
401			and often aio_read, which we do not use yet, but it shouldn't hurt.
402
403	root	1.11	0.4 Mon Jul 11 05:28:25 CEST 2005
404	root	1.9	- added IO::AIO::flush, IO::AIO::poll.
405	root	1.10	- make callback argument optional for all calls.
406	root	1.8
407	root	1.7	0.3 Mon Jul 11 01:42:37 CEST 2005
408	root	1.5	- restructured manpage.
409	root	1.7	- added SYNOPSIS with examples for Event, Glib, Tk.
410			- remove explicit context support so I don't have to maintain
411			it for threaded perls (i.e. it should work now :).
412	root	1.5
413	root	1.4	0.2 Sun Jul 10 22:57:12 CEST 2005
414	root	1.2	- return immediately from poll_wait if nreqs==0.
415			- get rid of the request pipe and use faster thread-thread
416	root	1.3	communications for most requests and responses.
417	root	1.2
418	root	1.1	0.1
419			- cloned from Linux::AIO, which is very similar.
420