[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

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:	1.190
Committed:	Fri Jun 12 16:48:08 2009 UTC (14 years, 11 months ago) by root
Branch:	MAIN
CVS Tags:	rel-3_21
Changes since 1.189:	+7 -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	1.100
9	root	1.190	3.21 Fri Jun 12 18:45:53 CEST 2009
10	root	1.187	- new options --dirs and --files for treescan.
11	root	1.188	- install bin/treescan by default.
12	root	1.189	- (libeio) aio_readdir can now be cancelled while executing.
13	root	1.190	- fix a printf format string for 64 bit systems (could lead
14			to problems on big endian 64 bit systems).
15			- do not use qsort() but our own algorithm: glibc initialises
16			the whole locale and I/O subsystem inside qsort, causing
17			a stack overflow on 32 bit machines. The new sort uses much less
18			stack and is more than twice as fast in typical situations.
19	root	1.187
20	root	1.186	3.2 Sun Jun 7 20:30:05 CEST 2009
21	root	1.182	- (libeio) pwrite emulation was even more flawed than intended and did
22			not restore the file offset.
23	root	1.183	- add aio_readdirx, which can return inode and filetype and sort
24			the names in various ways.
25	root	1.182	- unfortunately, utime, chmod, chown on an open file that has just
26			been written can easily block, which caused aio_copy to block the
27			process. no more!
28			- no longer rely on dst path in aio_copy when futime is available.
29
30	root	1.181	3.19 Tue Apr 21 22:05:21 CEST 2009
31			- more perl 5.10 workarounds for aio_read and write.
32			- aio_write no longer modifies the sv (if possible).
33			- aio_read now works correctly with magic values.
34
35	root	1.180	3.18 Sun Apr 19 21:17:32 CEST 2009
36	root	1.179	- better diagnostics when some aio_* functions get passed an illegal fh.
37	root	1.180	- try to avoid crashes due to incompatible 5.10 API changes. grmbl.
38	root	1.178
39	root	1.177	3.17 Thu Nov 20 08:45:36 CET 2008
40	root	1.176	- (libeio) added aio_sync_file_range (untested).
41	root	1.177	- add aio_busy to @IO::AIO::AIO_REQ.
42	root	1.175
43	root	1.174	3.16 Wed Oct 22 18:28:01 CEST 2008
44	root	1.173	- use SvREFCNT_inc instead of SvREFCNT_inc_NN in a non-speed critical
45			part to improve portability to perl 5.8 (reported by szymon).
46
47	root	1.172	3.15 Mon Oct 13 00:39:55 CEST 2008
48	root	1.171	- automatic removal of feeders was broken.
49			- (libeio) use a more robust method to detect whether a feeder
50			has added something to the group or not.
51
52	root	1.170	3.1 Thu Oct 2 13:34:40 CEST 2008
53	root	1.168	- pre-deref the passed callback object, for increased speed
54			and decreased memory usage.
55	root	1.167	- call on_next_submit callback even for aio_group - impact unknown,
56	root	1.166	but seems more correct.
57	root	1.168	- $req->cb now returns the original callback.
58	root	1.166	- (libeio) pass EIO_GROUP/aio_group requests through the queue without
59			requiring a thread switch.
60	root	1.169	- (libeio) status code of aio_futime and aio_utime was always passed 0.
61	root	1.166	- do some other µ-optimisations.
62
63	root	1.165	3.07 Sat Aug 2 16:06:13 CEST 2008
64			- do not include LIBS in autoconf tests.
65
66	root	1.164	3.06 Tue Jul 15 12:41:32 CEST 2008
67	root	1.162	- move preadwritelock definition before it's first reference,
68	root	1.164	to make it compile again on broken platforms (they still exist)
69			or badly cofngiured perls (redhat...), reported by Rob Bloodgood.
70	root	1.162
71	root	1.161	3.05 Thu Jun 19 23:23:52 CEST 2008
72	root	1.160	- work around perl overriding readdir etc. with thread-unsafe
73	root	1.161	(sic!) versions.
74	root	1.160
75	root	1.159	3.04 Wed Jun 18 01:35:38 CEST 2008
76			- (libeio) fix eio_mknod, which confused it's arguments.
77	root	1.158	- (libeio) do not use readdir_r, as Ulrich Drepper pointed out that this
78			is stupid.
79	root	1.159	- (libeio) fix eio__readahead prototype, patch by Jost Krieger.
80			- (libeio) fix a bug that could potentially cause IO::AIO
81			not to get initialised properly.
82	root	1.158
83	root	1.157	3.03 Thu May 29 05:33:30 CEST 2008
84	root	1.153	- (libeio) correctly call pthread_attr_destroy ().
85	root	1.155	- (libeio) work around broken bsd headers once more.
86	root	1.154	- reduce shared library size again by not including wrappers.
87	root	1.156	- max_outstanding could cause poll to enter a busy-waiting loop.
88			- document the new IO::AIO::poll_cb result value.
89	root	1.153
90	root	1.152	3.02 Mon May 12 02:32:02 CEST 2008
91	root	1.150	- fix a memory leak on aio_readlink.
92			- bring back working fchmod.
93	root	1.151	- nop and busy now set result to 0.
94			- set errno to ENOMEM when allocation fails.
95	root	1.150
96	root	1.149	3.01 Sun May 11 03:07:03 CEST 2008
97			- (libeio) make it compile on systems without readahead or readdir_r.
98	root	1.148	- (libeio) improve configure check for readahead availability.
99			- do not try to link against -lrt.
100	root	1.147	- use a separate configure script for IO::AIO (not the libeio one).
101
102	root	1.146	3.0 Sun May 11 00:57:14 CEST 2008
103	root	1.145	- added bin/treescan to the distribution.
104			- switched to using libeio.
105			- LOTS OF INCOMPATIBLE CHANGES:
106			- remove signal functionality, it is not worth the effort.
107			- max_outstanding no longer returns the previous number of requests.
108			- poll_cb no longer returns number of requests.
109	root	1.143
110	root	1.142	2.62 Sat Apr 26 13:59:33 CEST 2008
111	root	1.141	- port to solaris perls configured for old posix
112			(analysed by Jost Krieger).
113	root	1.142	- keep a reference to the perl filehandle object in aio_close,
114			so it doesn't get closed prematurely, leading to ugly races.
115	root	1.141
116	root	1.140	2.61 Wed Apr 16 18:45:02 CEST 2008
117	root	1.137	- fix treescan output duplication and improve output ordering.
118			also display files given on the commandline.
119	root	1.140	- use a different algorithm for aio_close that is faster
120			and probably has even lower chances of blocking.
121	root	1.138	- do our own stack memory management for threads - linux
122			allocates outrageous amounts of VM (not so bad unless you
123			use mlockall...), which severely limits the number of threads
124	root	1.139	on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
125			and 4096 * sizeof (long) (usually this is 16..64k).
126	root	1.137
127	root	1.136	2.6 Sun Mar 30 08:28:11 CEST 2008
128	root	1.134	- added aio_sync.
129	root	1.135	- added aio_pathsync.
130	root	1.136	- fix prototypes of (void) functions.
131	root	1.134
132	root	1.133	2.51 Sat Oct 6 16:04:54 CEST 2007
133			- perlio isn't generally threadsafe, so aio_close could not work reliably.
134			aio_close now tries a safe hack that might not be that asynchronous
135			(see the manpage for details).
136			- discard callback return values as to not grow the stack endlessly
137			when poll_cb handles many requests without returning.
138			- minor code cleanups.
139
140	root	1.132	2.5 Thu Oct 4 14:49:08 CEST 2007
141	root	1.131	- replaced _fd2fh with faster xs code.
142			- aio_close will now try to do "the right thing" and thus might
143			work sensibly for the very first time.
144
145	root	1.130	2.41 Mon Sep 24 21:28:21 CEST 2007
146	root	1.129	- after fork, invest some work to make sure that the poll_fileno
147			stays stable (by dup2'ing the new fd over the old one), to make
148			it easier for programs/libs that don't control their forking
149			behaviour and cannot recreate their watchers.
150
151	root	1.128	2.4 Sun Aug 5 18:44:22 CEST 2007
152	root	1.127	- add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
153			successfully demonstrated that you can block on futimes...).
154	root	1.124	- allow undef as fileoffset for aio_read/write and use read/write(2)
155			internally (useful for sockets or O_APPEND handles).
156	root	1.126	- allow undef for length in aio_write.
157			- negative dataoffsets work as expected now in aio_read/aio_write.
158	root	1.124	- use NV instead of UV for 32 bit perls and file offsets, as NVs
159	root	1.125	have a larger range then.
160	root	1.120	- shared code between BDB and IO::AIO.
161	root	1.127	- aio_busy was completely broken. now fixed.
162			- readahead emulation now returns something.
163	root	1.121	- correctly set errno to ENOSYS on unimplemented functions
164			(should never happen, though).
165	root	1.127	- large changes to make it partially compile and run on win32,
166			but win32 lacks too much functionality, and perl overrides way
167			too many functions with crashing versions.
168	root	1.120
169	root	1.119	2.33 Tue Jan 23 23:55:41 CET 2007
170			- fix install path (Andreas J. Koenig).
171
172	root	1.118	2.32 Mon Jan 22 16:56:23 CET 2007
173	root	1.114	- added aio_rmtree.
174	root	1.115	- wow, aio_mkdir was missing.
175	root	1.116	- aio_load did return undef on error, not -1.
176	root	1.117	- use prefixexp not prefix in autoconf.pm
177			(suggested by ... rt.cpan.org unreachable).
178	root	1.118	- avoid installing autoconf.pm.
179	root	1.114
180	root	1.113	2.31 Sat Jan 6 03:46:02 CET 2007
181	root	1.112	- added aio_load.
182
183	root	1.111	2.3 Sat Dec 23 05:48:07 CET 2006
184			- fix off-by-one bug in aio_read, causing memory corruption
185			or crashes.
186
187	root	1.110	2.21 Fri Dec 22 05:03:38 CET 2006
188	root	1.108	- minor doc updates.
189	root	1.107	- minor cleanups.
190			- IO::AIO::poll returns request count.
191	root	1.109	- undocumented and unfinished async-signal-reporting.
192	root	1.107
193	root	1.103	2.2 Tue Oct 31 00:31:00 CET 2006
194	root	1.100	- minor doc updates.
195	root	1.101	- added aio_readlink.
196			- properly zero-terminate aio_read buffer.
197			- fix aio_read/write with nonzero dataoffset.
198	root	1.104	- reduced size of aio request structure.
199	root	1.106	- better diagnostics when pathnames etc. are not byte-encoded;
200	root	1.105	do not leak request in that case, either.
201	root	1.94
202	root	1.99	2.1 Sun Oct 29 02:01:57 CET 2006
203	root	1.98	- INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
204			IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
205	root	1.95	- fix a bug in aio_move where it would fail everytime
206			it would have to copy files manually.
207	root	1.98	- doc updates.
208	root	1.94	- start threads only on (very low) demand.
209	root	1.97	- end superfluous threads automatically after 10s idling.
210	root	1.98	- add IO::AIO::max_idle to control this.
211	root	1.94	- some tuning applied to random places.
212	root	1.95	- add aio_mknod.
213	root	1.59
214	root	1.92	2.0 Thu Oct 26 18:27:58 CEST 2006
215	root	1.90	- minor incompatibility: max_outstanding semantics have changed.
216	root	1.86	- major rewrite, consider all functionality EXPERIMENTAL.
217	root	1.68	- aio requests can be cancelled.
218	root	1.81	- callbacks can be (re-)set later.
219	root	1.93	- aio requests can choose between 9 priorities.
220	root	1.83	- add aio_group: aio requests can be grouped
221			into composite requests.
222			- generator interface for groups.
223	root	1.89	- add IO::AIO::poll_some.
224	root	1.72	- major documentation improvements.
225			- very minor bugfixes.
226	root	1.76	- add aio_nop for dummy requests.
227	root	1.84	- add aio_busy mainly for benchmarking and debugging.
228	root	1.79	- use "fast" mutexes on linux.
229	root	1.80	- use dynamic (and larger) buffers instead of
230			putting them onto the stack.
231			- optimise x86 and amd64 a bit.
232			- better error checking when ENOMEM.
233	root	1.85	- hopefully fix mem and dirp leaks on fork.
234	root	1.92	- warn about broken perl malloc.
235	root	1.88	- compiles on cygwin (but pread is broken on cygwin
236			which is not detected by autoconf, so you have to
237			edit autoconf/config.h yourself to enable emulation).
238	root	1.68
239	root	1.67	1.8 Sat Jun 24 22:20:44 CEST 2006
240	root	1.66	- add and/or document aio_rename, aio_link, aio_symlink and aio_move.
241
242	root	1.65	1.73 Wed Mar 1 22:49:32 CET 2006
243			- codename "jost"
244			- AIX/Solaris(?) aren't being helpful again, hardcode a value
245			for NAME_MAX and drive with your eyes closed (reported by
246			wcooley@nakedape.cc).
247	root	1.63
248	root	1.62	1.72 Thu Feb 2 00:40:44 CET 2006
249	root	1.61	- another minor bug in aio_scandir, again, the callback was called
250			twice when the directory can't be stat'ed.
251
252	root	1.60	1.71 Mon Dec 26 20:20:03 CET 2005
253			- grr, another minor bug in aio_scandir, this time resulting
254			in a runtime error.
255
256	root	1.59	1.7 Mon Dec 26 19:29:48 CET 2005
257	root	1.58	- aio_scandir errornously called callback twice in some cases.
258	root	1.57	- added AnyEvent example.
259
260	root	1.55	1.61 Wed Sep 7 19:40:42 CEST 2005
261	root	1.54	- no longer include $Config{libs}, as distros include too much
262	root	1.56	garbage in there that is not installed on typical systems
263	root	1.54	(for example, debian links perl against -lgdbm and many more
264			libraries despite perl not needing it, slowing down startup and
265			wasting memory).
266
267	root	1.53	1.6 Tue Aug 30 17:44:44 CEST 2005
268			- added aio_readdir, aio_scandir.
269	root	1.51	- added aio_sendfile, including sendfile emulation when sendfile
270			isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
271			support is unavailable on my solaris 8 machine, but preliminary
272			code is there. What's lacking is configury stuff and testing...).
273	root	1.46
274	root	1.44	1.5 Sat Aug 20 02:32:19 CEST 2005
275	root	1.51	- create the aio threads on demand only (good after forking).
276	root	1.41	- somebody nagged about C89 compatibility, so this release should
277	root	1.42	be C89 compatible, but no guarantees for future ones.
278	root	1.43	- abort when the configure script fails.
279	root	1.41
280	root	1.40	1.4 Wed Aug 17 08:07:27 CEST 2005
281	root	1.93	- forgot to recreate the pipe after forking, this could cause
282	root	1.40	deadlocks.
283
284	root	1.39	1.3 Wed Aug 17 07:25:54 CEST 2005
285	root	1.33	- properly propagate exceptions from callbacks, instead of silently
286			eating them.
287	root	1.38	- use a different fork algorithm that avoids recursive callback
288			invocations and reduces fork latency in busy processes.
289	root	1.37	- fix a bug where the buffer scalar in aio_read got assigned the wrong
290			length after reading.
291			- fix a bug where the child would process some outstanding requests
292			from the parent.
293			- make a copy of the callback scalar, to avoid some very uncommon
294			(but valid) usages where the callback scalar changes.
295			- the callback was never freed in aio_read/aio_write.
296	root	1.38	- aio_read/aio_write will now set the readonly flag on the data
297			scalar for better error reporting.
298	root	1.33
299	root	1.32	1.2 Wed Aug 17 01:22:58 CEST 2005
300			- verified on cygwin, linux/amd64+ia32+alpha, solaris.
301	root	1.31	- use SvPVbyte for filenames now. You need to encode your strings to
302			the external filename encoding first.
303	root	1.32	- fix the bug where filehandles could leak (again).
304	root	1.31	- clarify freebsd situation: make it work and tell me how, or go away
305			with your underdocumented, broken and outdated OS.
306			- fork'ing should now be officially supported (where linux and
307			posix contradict each other, I followed posix).
308	root	1.32	- only call read() once per poll, not twice (speedup).
309			- new functions: aio_rmdir, aio_symlink.
310	root	1.31	- force callback arguments to be undef or a reference, for better
311			error catching.
312	root	1.1
313	root	1.29	1.1 Sun Aug 7 05:27:23 CEST 2005
314	root	1.25	- added configure script to detect availability of some calls.
315	root	1.27	(imperfect, as we cannot detect things like -lrt due to missing
316	root	1.23	feedback yet).
317	root	1.27	- emulate fdatasync via fsync, pread/pwrite via unsafe read/write
318			and readahead via manual reading on platforms lacking those.
319	root	1.19	- ported t/03_errors.t+framework by Brad Fitzpatrick
320			from Linux::AIO.
321	root	1.18	- removed XOPEN_SOURCE because stupid solaris 9 doesn't
322			compile with it enabled. Probably breaks others. Oh well.
323	root	1.24	- try to be more careful with errno on non-threaded perls.
324	root	1.26	- cygwins perl insisted on a matching open mode when morphing
325			the fd to an fh.
326	root	1.28	- convert sv's to "byte" encoding in aio_read/aio_write. Might
327			do that for pathnames, too, in the future, so make sure you
328			properly encode your pathnames.
329	root	1.18
330	root	1.17	1.0 Fri Jul 22 10:43:30 CEST 2005
331			- aio_open did not reliably deliver (open) filehandles.
332	root	1.16	- all aio_*-functions keep a reference to the filehandle so
333			it doesn't go away while the aio requests is working on it.
334			- disable warnings in AIO.pm.
335
336	root	1.15	0.9 Wed Jul 20 23:55:04 CEST 2005
337			- allow recursive calls to poll_cb, use less locking calls, too.
338			- fix the Gtk2-example in the SYNOPSIS.
339	root	1.14	- use pread/pwrite not pread64/pwrite64. this was simply a leftover
340			from Linux::AIO.
341			(found by compiling on cygwin. Unfortunately, cygwin declares but
342			does not implement pread/pwrite).
343			- only include <sys/syscall.h> on linux.
344
345	root	1.13	0.5 Tue Jul 12 13:03:09 CEST 2005
346	root	1.12	- removed #include <endian.h>, it's not portable, and we don't
347			need it anyway.
348			- link against -lrt, as it might contain goodies such as fdatasync,
349			and often aio_read, which we do not use yet, but it shouldn't hurt.
350
351	root	1.11	0.4 Mon Jul 11 05:28:25 CEST 2005
352	root	1.9	- added IO::AIO::flush, IO::AIO::poll.
353	root	1.10	- make callback argument optional for all calls.
354	root	1.8
355	root	1.7	0.3 Mon Jul 11 01:42:37 CEST 2005
356	root	1.5	- restructured manpage.
357	root	1.7	- added SYNOPSIS with examples for Event, Glib, Tk.
358			- remove explicit context support so I don't have to maintain
359			it for threaded perls (i.e. it should work now :).
360	root	1.5
361	root	1.4	0.2 Sun Jul 10 22:57:12 CEST 2005
362	root	1.2	- return immediately from poll_wait if nreqs==0.
363			- get rid of the request pipe and use faster thread-thread
364	root	1.3	communications for most requests and responses.
365	root	1.2
366	root	1.1	0.1
367			- cloned from Linux::AIO, which is very similar.
368