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

        - 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:	1.147
Committed:	Sun May 11 00:01:03 2008 UTC (16 years ago) by root
Branch:	MAIN
Changes since 1.146:	+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	1.123	TODO: splice/tee/vmsplice/sync_file_range? (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	1.147	- use a separate configure script for IO::AIO (not the libeio one).
10
11	root	1.146	3.0 Sun May 11 00:57:14 CEST 2008
12	root	1.145	- added bin/treescan to the distribution.
13			- switched to using libeio.
14			- LOTS OF INCOMPATIBLE CHANGES:
15			- remove signal functionality, it is not worth the effort.
16			- max_outstanding no longer returns the previous number of requests.
17			- poll_cb no longer returns number of requests.
18	root	1.143
19	root	1.142	2.62 Sat Apr 26 13:59:33 CEST 2008
20	root	1.141	- port to solaris perls configured for old posix
21			(analysed by Jost Krieger).
22	root	1.142	- keep a reference to the perl filehandle object in aio_close,
23			so it doesn't get closed prematurely, leading to ugly races.
24	root	1.141
25	root	1.140	2.61 Wed Apr 16 18:45:02 CEST 2008
26	root	1.137	- fix treescan output duplication and improve output ordering.
27			also display files given on the commandline.
28	root	1.140	- use a different algorithm for aio_close that is faster
29			and probably has even lower chances of blocking.
30	root	1.138	- do our own stack memory management for threads - linux
31			allocates outrageous amounts of VM (not so bad unless you
32			use mlockall...), which severely limits the number of threads
33	root	1.139	on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
34			and 4096 * sizeof (long) (usually this is 16..64k).
35	root	1.137
36	root	1.136	2.6 Sun Mar 30 08:28:11 CEST 2008
37	root	1.134	- added aio_sync.
38	root	1.135	- added aio_pathsync.
39	root	1.136	- fix prototypes of (void) functions.
40	root	1.134
41	root	1.133	2.51 Sat Oct 6 16:04:54 CEST 2007
42			- perlio isn't generally threadsafe, so aio_close could not work reliably.
43			aio_close now tries a safe hack that might not be that asynchronous
44			(see the manpage for details).
45			- discard callback return values as to not grow the stack endlessly
46			when poll_cb handles many requests without returning.
47			- minor code cleanups.
48
49	root	1.132	2.5 Thu Oct 4 14:49:08 CEST 2007
50	root	1.131	- replaced _fd2fh with faster xs code.
51			- aio_close will now try to do "the right thing" and thus might
52			work sensibly for the very first time.
53
54	root	1.130	2.41 Mon Sep 24 21:28:21 CEST 2007
55	root	1.129	- after fork, invest some work to make sure that the poll_fileno
56			stays stable (by dup2'ing the new fd over the old one), to make
57			it easier for programs/libs that don't control their forking
58			behaviour and cannot recreate their watchers.
59
60	root	1.128	2.4 Sun Aug 5 18:44:22 CEST 2007
61	root	1.127	- add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
62			successfully demonstrated that you can block on futimes...).
63	root	1.124	- allow undef as fileoffset for aio_read/write and use read/write(2)
64			internally (useful for sockets or O_APPEND handles).
65	root	1.126	- allow undef for length in aio_write.
66			- negative dataoffsets work as expected now in aio_read/aio_write.
67	root	1.124	- use NV instead of UV for 32 bit perls and file offsets, as NVs
68	root	1.125	have a larger range then.
69	root	1.120	- shared code between BDB and IO::AIO.
70	root	1.127	- aio_busy was completely broken. now fixed.
71			- readahead emulation now returns something.
72	root	1.121	- correctly set errno to ENOSYS on unimplemented functions
73			(should never happen, though).
74	root	1.127	- large changes to make it partially compile and run on win32,
75			but win32 lacks too much functionality, and perl overrides way
76			too many functions with crashing versions.
77	root	1.120
78	root	1.119	2.33 Tue Jan 23 23:55:41 CET 2007
79			- fix install path (Andreas J. Koenig).
80
81	root	1.118	2.32 Mon Jan 22 16:56:23 CET 2007
82	root	1.114	- added aio_rmtree.
83	root	1.115	- wow, aio_mkdir was missing.
84	root	1.116	- aio_load did return undef on error, not -1.
85	root	1.117	- use prefixexp not prefix in autoconf.pm
86			(suggested by ... rt.cpan.org unreachable).
87	root	1.118	- avoid installing autoconf.pm.
88	root	1.114
89	root	1.113	2.31 Sat Jan 6 03:46:02 CET 2007
90	root	1.112	- added aio_load.
91
92	root	1.111	2.3 Sat Dec 23 05:48:07 CET 2006
93			- fix off-by-one bug in aio_read, causing memory corruption
94			or crashes.
95
96	root	1.110	2.21 Fri Dec 22 05:03:38 CET 2006
97	root	1.108	- minor doc updates.
98	root	1.107	- minor cleanups.
99			- IO::AIO::poll returns request count.
100	root	1.109	- undocumented and unfinished async-signal-reporting.
101	root	1.107
102	root	1.103	2.2 Tue Oct 31 00:31:00 CET 2006
103	root	1.100	- minor doc updates.
104	root	1.101	- added aio_readlink.
105			- properly zero-terminate aio_read buffer.
106			- fix aio_read/write with nonzero dataoffset.
107	root	1.104	- reduced size of aio request structure.
108	root	1.106	- better diagnostics when pathnames etc. are not byte-encoded;
109	root	1.105	do not leak request in that case, either.
110	root	1.94
111	root	1.99	2.1 Sun Oct 29 02:01:57 CET 2006
112	root	1.98	- INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
113			IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
114	root	1.95	- fix a bug in aio_move where it would fail everytime
115			it would have to copy files manually.
116	root	1.98	- doc updates.
117	root	1.94	- start threads only on (very low) demand.
118	root	1.97	- end superfluous threads automatically after 10s idling.
119	root	1.98	- add IO::AIO::max_idle to control this.
120	root	1.94	- some tuning applied to random places.
121	root	1.95	- add aio_mknod.
122	root	1.59
123	root	1.92	2.0 Thu Oct 26 18:27:58 CEST 2006
124	root	1.90	- minor incompatibility: max_outstanding semantics have changed.
125	root	1.86	- major rewrite, consider all functionality EXPERIMENTAL.
126	root	1.68	- aio requests can be cancelled.
127	root	1.81	- callbacks can be (re-)set later.
128	root	1.93	- aio requests can choose between 9 priorities.
129	root	1.83	- add aio_group: aio requests can be grouped
130			into composite requests.
131			- generator interface for groups.
132	root	1.89	- add IO::AIO::poll_some.
133	root	1.72	- major documentation improvements.
134			- very minor bugfixes.
135	root	1.76	- add aio_nop for dummy requests.
136	root	1.84	- add aio_busy mainly for benchmarking and debugging.
137	root	1.79	- use "fast" mutexes on linux.
138	root	1.80	- use dynamic (and larger) buffers instead of
139			putting them onto the stack.
140			- optimise x86 and amd64 a bit.
141			- better error checking when ENOMEM.
142	root	1.85	- hopefully fix mem and dirp leaks on fork.
143	root	1.92	- warn about broken perl malloc.
144	root	1.88	- compiles on cygwin (but pread is broken on cygwin
145			which is not detected by autoconf, so you have to
146			edit autoconf/config.h yourself to enable emulation).
147	root	1.68
148	root	1.67	1.8 Sat Jun 24 22:20:44 CEST 2006
149	root	1.66	- add and/or document aio_rename, aio_link, aio_symlink and aio_move.
150
151	root	1.65	1.73 Wed Mar 1 22:49:32 CET 2006
152			- codename "jost"
153			- AIX/Solaris(?) aren't being helpful again, hardcode a value
154			for NAME_MAX and drive with your eyes closed (reported by
155			wcooley@nakedape.cc).
156	root	1.63
157	root	1.62	1.72 Thu Feb 2 00:40:44 CET 2006
158	root	1.61	- another minor bug in aio_scandir, again, the callback was called
159			twice when the directory can't be stat'ed.
160
161	root	1.60	1.71 Mon Dec 26 20:20:03 CET 2005
162			- grr, another minor bug in aio_scandir, this time resulting
163			in a runtime error.
164
165	root	1.59	1.7 Mon Dec 26 19:29:48 CET 2005
166	root	1.58	- aio_scandir errornously called callback twice in some cases.
167	root	1.57	- added AnyEvent example.
168
169	root	1.55	1.61 Wed Sep 7 19:40:42 CEST 2005
170	root	1.54	- no longer include $Config{libs}, as distros include too much
171	root	1.56	garbage in there that is not installed on typical systems
172	root	1.54	(for example, debian links perl against -lgdbm and many more
173			libraries despite perl not needing it, slowing down startup and
174			wasting memory).
175
176	root	1.53	1.6 Tue Aug 30 17:44:44 CEST 2005
177			- added aio_readdir, aio_scandir.
178	root	1.51	- added aio_sendfile, including sendfile emulation when sendfile
179			isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
180			support is unavailable on my solaris 8 machine, but preliminary
181			code is there. What's lacking is configury stuff and testing...).
182	root	1.46
183	root	1.44	1.5 Sat Aug 20 02:32:19 CEST 2005
184	root	1.51	- create the aio threads on demand only (good after forking).
185	root	1.41	- somebody nagged about C89 compatibility, so this release should
186	root	1.42	be C89 compatible, but no guarantees for future ones.
187	root	1.43	- abort when the configure script fails.
188	root	1.41
189	root	1.40	1.4 Wed Aug 17 08:07:27 CEST 2005
190	root	1.93	- forgot to recreate the pipe after forking, this could cause
191	root	1.40	deadlocks.
192
193	root	1.39	1.3 Wed Aug 17 07:25:54 CEST 2005
194	root	1.33	- properly propagate exceptions from callbacks, instead of silently
195			eating them.
196	root	1.38	- use a different fork algorithm that avoids recursive callback
197			invocations and reduces fork latency in busy processes.
198	root	1.37	- fix a bug where the buffer scalar in aio_read got assigned the wrong
199			length after reading.
200			- fix a bug where the child would process some outstanding requests
201			from the parent.
202			- make a copy of the callback scalar, to avoid some very uncommon
203			(but valid) usages where the callback scalar changes.
204			- the callback was never freed in aio_read/aio_write.
205	root	1.38	- aio_read/aio_write will now set the readonly flag on the data
206			scalar for better error reporting.
207	root	1.33
208	root	1.32	1.2 Wed Aug 17 01:22:58 CEST 2005
209			- verified on cygwin, linux/amd64+ia32+alpha, solaris.
210	root	1.31	- use SvPVbyte for filenames now. You need to encode your strings to
211			the external filename encoding first.
212	root	1.32	- fix the bug where filehandles could leak (again).
213	root	1.31	- clarify freebsd situation: make it work and tell me how, or go away
214			with your underdocumented, broken and outdated OS.
215			- fork'ing should now be officially supported (where linux and
216			posix contradict each other, I followed posix).
217	root	1.32	- only call read() once per poll, not twice (speedup).
218			- new functions: aio_rmdir, aio_symlink.
219	root	1.31	- force callback arguments to be undef or a reference, for better
220			error catching.
221	root	1.1
222	root	1.29	1.1 Sun Aug 7 05:27:23 CEST 2005
223	root	1.25	- added configure script to detect availability of some calls.
224	root	1.27	(imperfect, as we cannot detect things like -lrt due to missing
225	root	1.23	feedback yet).
226	root	1.27	- emulate fdatasync via fsync, pread/pwrite via unsafe read/write
227			and readahead via manual reading on platforms lacking those.
228	root	1.19	- ported t/03_errors.t+framework by Brad Fitzpatrick
229			from Linux::AIO.
230	root	1.18	- removed XOPEN_SOURCE because stupid solaris 9 doesn't
231			compile with it enabled. Probably breaks others. Oh well.
232	root	1.24	- try to be more careful with errno on non-threaded perls.
233	root	1.26	- cygwins perl insisted on a matching open mode when morphing
234			the fd to an fh.
235	root	1.28	- convert sv's to "byte" encoding in aio_read/aio_write. Might
236			do that for pathnames, too, in the future, so make sure you
237			properly encode your pathnames.
238	root	1.18
239	root	1.17	1.0 Fri Jul 22 10:43:30 CEST 2005
240			- aio_open did not reliably deliver (open) filehandles.
241	root	1.16	- all aio_*-functions keep a reference to the filehandle so
242			it doesn't go away while the aio requests is working on it.
243			- disable warnings in AIO.pm.
244
245	root	1.15	0.9 Wed Jul 20 23:55:04 CEST 2005
246			- allow recursive calls to poll_cb, use less locking calls, too.
247			- fix the Gtk2-example in the SYNOPSIS.
248	root	1.14	- use pread/pwrite not pread64/pwrite64. this was simply a leftover
249			from Linux::AIO.
250			(found by compiling on cygwin. Unfortunately, cygwin declares but
251			does not implement pread/pwrite).
252			- only include <sys/syscall.h> on linux.
253
254	root	1.13	0.5 Tue Jul 12 13:03:09 CEST 2005
255	root	1.12	- removed #include <endian.h>, it's not portable, and we don't
256			need it anyway.
257			- link against -lrt, as it might contain goodies such as fdatasync,
258			and often aio_read, which we do not use yet, but it shouldn't hurt.
259
260	root	1.11	0.4 Mon Jul 11 05:28:25 CEST 2005
261	root	1.9	- added IO::AIO::flush, IO::AIO::poll.
262	root	1.10	- make callback argument optional for all calls.
263	root	1.8
264	root	1.7	0.3 Mon Jul 11 01:42:37 CEST 2005
265	root	1.5	- restructured manpage.
266	root	1.7	- added SYNOPSIS with examples for Event, Glib, Tk.
267			- remove explicit context support so I don't have to maintain
268			it for threaded perls (i.e. it should work now :).
269	root	1.5
270	root	1.4	0.2 Sun Jul 10 22:57:12 CEST 2005
271	root	1.2	- return immediately from poll_wait if nreqs==0.
272			- get rid of the request pipe and use faster thread-thread
273	root	1.3	communications for most requests and responses.
274	root	1.2
275	root	1.1	0.1
276			- cloned from Linux::AIO, which is very similar.
277