[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/sync_file_range? (http://kerneltrap.org/node/6505 http://lwn.net/Articles/178199/)
TODO: sync_file_range
TODO: aio_fcntl, at least for file-locking

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:	1.174
Committed:	Wed Oct 22 16:30:49 2008 UTC (15 years, 7 months ago) by root
Branch:	MAIN
CVS Tags:	rel-3_16
Changes since 1.173:	+2 -0 lines
Log Message:	* empty log message *
#	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/sync_file_range? (http://kerneltrap.org/node/6505 http://lwn.net/Articles/178199/)
7	TODO: sync_file_range
8	TODO: aio_fcntl, at least for file-locking
9
10	3.16 Wed Oct 22 18:28:01 CEST 2008
11	- use SvREFCNT_inc instead of SvREFCNT_inc_NN in a non-speed critical
12	part to improve portability to perl 5.8 (reported by szymon).
13
14	3.15 Mon Oct 13 00:39:55 CEST 2008
15	- automatic removal of feeders was broken.
16	- (libeio) use a more robust method to detect whether a feeder
17	has added something to the group or not.
18
19	3.1 Thu Oct 2 13:34:40 CEST 2008
20	- pre-deref the passed callback object, for increased speed
21	and decreased memory usage.
22	- call on_next_submit callback even for aio_group - impact unknown,
23	but seems more correct.
24	- $req->cb now returns the original callback.
25	- (libeio) pass EIO_GROUP/aio_group requests through the queue without
26	requiring a thread switch.
27	- (libeio) status code of aio_futime and aio_utime was always passed 0.
28	- do some other µ-optimisations.
29
30	3.07 Sat Aug 2 16:06:13 CEST 2008
31	- do not include LIBS in autoconf tests.
32
33	3.06 Tue Jul 15 12:41:32 CEST 2008
34	- move preadwritelock definition before it's first reference,
35	to make it compile again on broken platforms (they still exist)
36	or badly cofngiured perls (redhat...), reported by Rob Bloodgood.
37
38	3.05 Thu Jun 19 23:23:52 CEST 2008
39	- work around perl overriding readdir etc. with thread-unsafe
40	(sic!) versions.
41
42	3.04 Wed Jun 18 01:35:38 CEST 2008
43	- (libeio) fix eio_mknod, which confused it's arguments.
44	- (libeio) do not use readdir_r, as Ulrich Drepper pointed out that this
45	is stupid.
46	- (libeio) fix eio__readahead prototype, patch by Jost Krieger.
47	- (libeio) fix a bug that could potentially cause IO::AIO
48	not to get initialised properly.
49
50	3.03 Thu May 29 05:33:30 CEST 2008
51	- (libeio) correctly call pthread_attr_destroy ().
52	- (libeio) work around broken bsd headers once more.
53	- reduce shared library size again by not including wrappers.
54	- max_outstanding could cause poll to enter a busy-waiting loop.
55	- document the new IO::AIO::poll_cb result value.
56
57	3.02 Mon May 12 02:32:02 CEST 2008
58	- fix a memory leak on aio_readlink.
59	- bring back working fchmod.
60	- nop and busy now set result to 0.
61	- set errno to ENOMEM when allocation fails.
62
63	3.01 Sun May 11 03:07:03 CEST 2008
64	- (libeio) make it compile on systems without readahead or readdir_r.
65	- (libeio) improve configure check for readahead availability.
66	- do not try to link against -lrt.
67	- use a separate configure script for IO::AIO (not the libeio one).
68
69	3.0 Sun May 11 00:57:14 CEST 2008
70	- added bin/treescan to the distribution.
71	- switched to using libeio.
72	- LOTS OF INCOMPATIBLE CHANGES:
73	- remove signal functionality, it is not worth the effort.
74	- max_outstanding no longer returns the previous number of requests.
75	- poll_cb no longer returns number of requests.
76
77	2.62 Sat Apr 26 13:59:33 CEST 2008
78	- port to solaris perls configured for old posix
79	(analysed by Jost Krieger).
80	- keep a reference to the perl filehandle object in aio_close,
81	so it doesn't get closed prematurely, leading to ugly races.
82
83	2.61 Wed Apr 16 18:45:02 CEST 2008
84	- fix treescan output duplication and improve output ordering.
85	also display files given on the commandline.
86	- use a different algorithm for aio_close that is faster
87	and probably has even lower chances of blocking.
88	- do our own stack memory management for threads - linux
89	allocates outrageous amounts of VM (not so bad unless you
90	use mlockall...), which severely limits the number of threads
91	on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
92	and 4096 * sizeof (long) (usually this is 16..64k).
93
94	2.6 Sun Mar 30 08:28:11 CEST 2008
95	- added aio_sync.
96	- added aio_pathsync.
97	- fix prototypes of (void) functions.
98
99	2.51 Sat Oct 6 16:04:54 CEST 2007
100	- perlio isn't generally threadsafe, so aio_close could not work reliably.
101	aio_close now tries a safe hack that might not be that asynchronous
102	(see the manpage for details).
103	- discard callback return values as to not grow the stack endlessly
104	when poll_cb handles many requests without returning.
105	- minor code cleanups.
106
107	2.5 Thu Oct 4 14:49:08 CEST 2007
108	- replaced _fd2fh with faster xs code.
109	- aio_close will now try to do "the right thing" and thus might
110	work sensibly for the very first time.
111
112	2.41 Mon Sep 24 21:28:21 CEST 2007
113	- after fork, invest some work to make sure that the poll_fileno
114	stays stable (by dup2'ing the new fd over the old one), to make
115	it easier for programs/libs that don't control their forking
116	behaviour and cannot recreate their watchers.
117
118	2.4 Sun Aug 5 18:44:22 CEST 2007
119	- add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
120	successfully demonstrated that you can block on futimes...).
121	- allow undef as fileoffset for aio_read/write and use read/write(2)
122	internally (useful for sockets or O_APPEND handles).
123	- allow undef for length in aio_write.
124	- negative dataoffsets work as expected now in aio_read/aio_write.
125	- use NV instead of UV for 32 bit perls and file offsets, as NVs
126	have a larger range then.
127	- shared code between BDB and IO::AIO.
128	- aio_busy was completely broken. now fixed.
129	- readahead emulation now returns something.
130	- correctly set errno to ENOSYS on unimplemented functions
131	(should never happen, though).
132	- large changes to make it partially compile and run on win32,
133	but win32 lacks too much functionality, and perl overrides way
134	too many functions with crashing versions.
135
136	2.33 Tue Jan 23 23:55:41 CET 2007
137	- fix install path (Andreas J. Koenig).
138
139	2.32 Mon Jan 22 16:56:23 CET 2007
140	- added aio_rmtree.
141	- wow, aio_mkdir was missing.
142	- aio_load did return undef on error, not -1.
143	- use prefixexp not prefix in autoconf.pm
144	(suggested by ... rt.cpan.org unreachable).
145	- avoid installing autoconf.pm.
146
147	2.31 Sat Jan 6 03:46:02 CET 2007
148	- added aio_load.
149
150	2.3 Sat Dec 23 05:48:07 CET 2006
151	- fix off-by-one bug in aio_read, causing memory corruption
152	or crashes.
153
154	2.21 Fri Dec 22 05:03:38 CET 2006
155	- minor doc updates.
156	- minor cleanups.
157	- IO::AIO::poll returns request count.
158	- undocumented and unfinished async-signal-reporting.
159
160	2.2 Tue Oct 31 00:31:00 CET 2006
161	- minor doc updates.
162	- added aio_readlink.
163	- properly zero-terminate aio_read buffer.
164	- fix aio_read/write with nonzero dataoffset.
165	- reduced size of aio request structure.
166	- better diagnostics when pathnames etc. are not byte-encoded;
167	do not leak request in that case, either.
168
169	2.1 Sun Oct 29 02:01:57 CET 2006
170	- INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
171	IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
172	- fix a bug in aio_move where it would fail everytime
173	it would have to copy files manually.
174	- doc updates.
175	- start threads only on (very low) demand.
176	- end superfluous threads automatically after 10s idling.
177	- add IO::AIO::max_idle to control this.
178	- some tuning applied to random places.
179	- add aio_mknod.
180
181	2.0 Thu Oct 26 18:27:58 CEST 2006
182	- minor incompatibility: max_outstanding semantics have changed.
183	- major rewrite, consider all functionality EXPERIMENTAL.
184	- aio requests can be cancelled.
185	- callbacks can be (re-)set later.
186	- aio requests can choose between 9 priorities.
187	- add aio_group: aio requests can be grouped
188	into composite requests.
189	- generator interface for groups.
190	- add IO::AIO::poll_some.
191	- major documentation improvements.
192	- very minor bugfixes.
193	- add aio_nop for dummy requests.
194	- add aio_busy mainly for benchmarking and debugging.
195	- use "fast" mutexes on linux.
196	- use dynamic (and larger) buffers instead of
197	putting them onto the stack.
198	- optimise x86 and amd64 a bit.
199	- better error checking when ENOMEM.
200	- hopefully fix mem and dirp leaks on fork.
201	- warn about broken perl malloc.
202	- compiles on cygwin (but pread is broken on cygwin
203	which is not detected by autoconf, so you have to
204	edit autoconf/config.h yourself to enable emulation).
205
206	1.8 Sat Jun 24 22:20:44 CEST 2006
207	- add and/or document aio_rename, aio_link, aio_symlink and aio_move.
208
209	1.73 Wed Mar 1 22:49:32 CET 2006
210	- codename "jost"
211	- AIX/Solaris(?) aren't being helpful again, hardcode a value
212	for NAME_MAX and drive with your eyes closed (reported by
213	wcooley@nakedape.cc).
214
215	1.72 Thu Feb 2 00:40:44 CET 2006
216	- another minor bug in aio_scandir, again, the callback was called
217	twice when the directory can't be stat'ed.
218
219	1.71 Mon Dec 26 20:20:03 CET 2005
220	- grr, another minor bug in aio_scandir, this time resulting
221	in a runtime error.
222
223	1.7 Mon Dec 26 19:29:48 CET 2005
224	- aio_scandir errornously called callback twice in some cases.
225	- added AnyEvent example.
226
227	1.61 Wed Sep 7 19:40:42 CEST 2005
228	- no longer include $Config{libs}, as distros include too much
229	garbage in there that is not installed on typical systems
230	(for example, debian links perl against -lgdbm and many more
231	libraries despite perl not needing it, slowing down startup and
232	wasting memory).
233
234	1.6 Tue Aug 30 17:44:44 CEST 2005
235	- added aio_readdir, aio_scandir.
236	- added aio_sendfile, including sendfile emulation when sendfile
237	isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
238	support is unavailable on my solaris 8 machine, but preliminary
239	code is there. What's lacking is configury stuff and testing...).
240
241	1.5 Sat Aug 20 02:32:19 CEST 2005
242	- create the aio threads on demand only (good after forking).
243	- somebody nagged about C89 compatibility, so this release should
244	be C89 compatible, but no guarantees for future ones.
245	- abort when the configure script fails.
246
247	1.4 Wed Aug 17 08:07:27 CEST 2005
248	- forgot to recreate the pipe after forking, this could cause
249	deadlocks.
250
251	1.3 Wed Aug 17 07:25:54 CEST 2005
252	- properly propagate exceptions from callbacks, instead of silently
253	eating them.
254	- use a different fork algorithm that avoids recursive callback
255	invocations and reduces fork latency in busy processes.
256	- fix a bug where the buffer scalar in aio_read got assigned the wrong
257	length after reading.
258	- fix a bug where the child would process some outstanding requests
259	from the parent.
260	- make a copy of the callback scalar, to avoid some very uncommon
261	(but valid) usages where the callback scalar changes.
262	- the callback was never freed in aio_read/aio_write.
263	- aio_read/aio_write will now set the readonly flag on the data
264	scalar for better error reporting.
265
266	1.2 Wed Aug 17 01:22:58 CEST 2005
267	- verified on cygwin, linux/amd64+ia32+alpha, solaris.
268	- use SvPVbyte for filenames now. You need to encode your strings to
269	the external filename encoding first.
270	- fix the bug where filehandles could leak (again).
271	- clarify freebsd situation: make it work and tell me how, or go away
272	with your underdocumented, broken and outdated OS.
273	- fork'ing should now be officially supported (where linux and
274	posix contradict each other, I followed posix).
275	- only call read() once per poll, not twice (speedup).
276	- new functions: aio_rmdir, aio_symlink.
277	- force callback arguments to be undef or a reference, for better
278	error catching.
279
280	1.1 Sun Aug 7 05:27:23 CEST 2005
281	- added configure script to detect availability of some calls.
282	(imperfect, as we cannot detect things like -lrt due to missing
283	feedback yet).
284	- emulate fdatasync via fsync, pread/pwrite via unsafe read/write
285	and readahead via manual reading on platforms lacking those.
286	- ported t/03_errors.t+framework by Brad Fitzpatrick
287	from Linux::AIO.
288	- removed XOPEN_SOURCE because stupid solaris 9 doesn't
289	compile with it enabled. Probably breaks others. Oh well.
290	- try to be more careful with errno on non-threaded perls.
291	- cygwins perl insisted on a matching open mode when morphing
292	the fd to an fh.
293	- convert sv's to "byte" encoding in aio_read/aio_write. Might
294	do that for pathnames, too, in the future, so make sure you
295	properly encode your pathnames.
296
297	1.0 Fri Jul 22 10:43:30 CEST 2005
298	- aio_open did not reliably deliver (open) filehandles.
299	- all aio_*-functions keep a reference to the filehandle so
300	it doesn't go away while the aio requests is working on it.
301	- disable warnings in AIO.pm.
302
303	0.9 Wed Jul 20 23:55:04 CEST 2005
304	- allow recursive calls to poll_cb, use less locking calls, too.
305	- fix the Gtk2-example in the SYNOPSIS.
306	- use pread/pwrite not pread64/pwrite64. this was simply a leftover
307	from Linux::AIO.
308	(found by compiling on cygwin. Unfortunately, cygwin declares but
309	does not implement pread/pwrite).
310	- only include <sys/syscall.h> on linux.
311
312	0.5 Tue Jul 12 13:03:09 CEST 2005
313	- removed #include <endian.h>, it's not portable, and we don't
314	need it anyway.
315	- link against -lrt, as it might contain goodies such as fdatasync,
316	and often aio_read, which we do not use yet, but it shouldn't hurt.
317
318	0.4 Mon Jul 11 05:28:25 CEST 2005
319	- added IO::AIO::flush, IO::AIO::poll.
320	- make callback argument optional for all calls.
321
322	0.3 Mon Jul 11 01:42:37 CEST 2005
323	- restructured manpage.
324	- added SYNOPSIS with examples for Event, Glib, Tk.
325	- remove explicit context support so I don't have to maintain
326	it for threaded perls (i.e. it should work now :).
327
328	0.2 Sun Jul 10 22:57:12 CEST 2005
329	- return immediately from poll_wait if nreqs==0.
330	- get rid of the request pipe and use faster thread-thread
331	communications for most requests and responses.
332
333	0.1
334	- cloned from Linux::AIO, which is very similar.
335