[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

        - 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:	1.143
Committed:	Sat May 10 18:06:41 2008 UTC (16 years ago) by root
Branch:	MAIN
Changes since 1.142:	+5 -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	1.143	- lots of incompatible changes:
10			- remove signal functionality, it is not worth the effort.
11			- max_outstanding no longer returns the previous number of requests.
12			- poll_cb no longer returns number of requests.
13
14	root	1.142	2.62 Sat Apr 26 13:59:33 CEST 2008
15	root	1.141	- port to solaris perls configured for old posix
16			(analysed by Jost Krieger).
17	root	1.142	- keep a reference to the perl filehandle object in aio_close,
18			so it doesn't get closed prematurely, leading to ugly races.
19	root	1.141
20	root	1.140	2.61 Wed Apr 16 18:45:02 CEST 2008
21	root	1.137	- fix treescan output duplication and improve output ordering.
22			also display files given on the commandline.
23	root	1.140	- use a different algorithm for aio_close that is faster
24			and probably has even lower chances of blocking.
25	root	1.138	- do our own stack memory management for threads - linux
26			allocates outrageous amounts of VM (not so bad unless you
27			use mlockall...), which severely limits the number of threads
28	root	1.139	on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
29			and 4096 * sizeof (long) (usually this is 16..64k).
30	root	1.137
31	root	1.136	2.6 Sun Mar 30 08:28:11 CEST 2008
32	root	1.134	- added aio_sync.
33	root	1.135	- added aio_pathsync.
34	root	1.136	- fix prototypes of (void) functions.
35	root	1.134
36	root	1.133	2.51 Sat Oct 6 16:04:54 CEST 2007
37			- perlio isn't generally threadsafe, so aio_close could not work reliably.
38			aio_close now tries a safe hack that might not be that asynchronous
39			(see the manpage for details).
40			- discard callback return values as to not grow the stack endlessly
41			when poll_cb handles many requests without returning.
42			- minor code cleanups.
43
44	root	1.132	2.5 Thu Oct 4 14:49:08 CEST 2007
45	root	1.131	- replaced _fd2fh with faster xs code.
46			- aio_close will now try to do "the right thing" and thus might
47			work sensibly for the very first time.
48
49	root	1.130	2.41 Mon Sep 24 21:28:21 CEST 2007
50	root	1.129	- after fork, invest some work to make sure that the poll_fileno
51			stays stable (by dup2'ing the new fd over the old one), to make
52			it easier for programs/libs that don't control their forking
53			behaviour and cannot recreate their watchers.
54
55	root	1.128	2.4 Sun Aug 5 18:44:22 CEST 2007
56	root	1.127	- add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
57			successfully demonstrated that you can block on futimes...).
58	root	1.124	- allow undef as fileoffset for aio_read/write and use read/write(2)
59			internally (useful for sockets or O_APPEND handles).
60	root	1.126	- allow undef for length in aio_write.
61			- negative dataoffsets work as expected now in aio_read/aio_write.
62	root	1.124	- use NV instead of UV for 32 bit perls and file offsets, as NVs
63	root	1.125	have a larger range then.
64	root	1.120	- shared code between BDB and IO::AIO.
65	root	1.127	- aio_busy was completely broken. now fixed.
66			- readahead emulation now returns something.
67	root	1.121	- correctly set errno to ENOSYS on unimplemented functions
68			(should never happen, though).
69	root	1.127	- large changes to make it partially compile and run on win32,
70			but win32 lacks too much functionality, and perl overrides way
71			too many functions with crashing versions.
72	root	1.120
73	root	1.119	2.33 Tue Jan 23 23:55:41 CET 2007
74			- fix install path (Andreas J. Koenig).
75
76	root	1.118	2.32 Mon Jan 22 16:56:23 CET 2007
77	root	1.114	- added aio_rmtree.
78	root	1.115	- wow, aio_mkdir was missing.
79	root	1.116	- aio_load did return undef on error, not -1.
80	root	1.117	- use prefixexp not prefix in autoconf.pm
81			(suggested by ... rt.cpan.org unreachable).
82	root	1.118	- avoid installing autoconf.pm.
83	root	1.114
84	root	1.113	2.31 Sat Jan 6 03:46:02 CET 2007
85	root	1.112	- added aio_load.
86
87	root	1.111	2.3 Sat Dec 23 05:48:07 CET 2006
88			- fix off-by-one bug in aio_read, causing memory corruption
89			or crashes.
90
91	root	1.110	2.21 Fri Dec 22 05:03:38 CET 2006
92	root	1.108	- minor doc updates.
93	root	1.107	- minor cleanups.
94			- IO::AIO::poll returns request count.
95	root	1.109	- undocumented and unfinished async-signal-reporting.
96	root	1.107
97	root	1.103	2.2 Tue Oct 31 00:31:00 CET 2006
98	root	1.100	- minor doc updates.
99	root	1.101	- added aio_readlink.
100			- properly zero-terminate aio_read buffer.
101			- fix aio_read/write with nonzero dataoffset.
102	root	1.104	- reduced size of aio request structure.
103	root	1.106	- better diagnostics when pathnames etc. are not byte-encoded;
104	root	1.105	do not leak request in that case, either.
105	root	1.94
106	root	1.99	2.1 Sun Oct 29 02:01:57 CET 2006
107	root	1.98	- INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
108			IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
109	root	1.95	- fix a bug in aio_move where it would fail everytime
110			it would have to copy files manually.
111	root	1.98	- doc updates.
112	root	1.94	- start threads only on (very low) demand.
113	root	1.97	- end superfluous threads automatically after 10s idling.
114	root	1.98	- add IO::AIO::max_idle to control this.
115	root	1.94	- some tuning applied to random places.
116	root	1.95	- add aio_mknod.
117	root	1.59
118	root	1.92	2.0 Thu Oct 26 18:27:58 CEST 2006
119	root	1.90	- minor incompatibility: max_outstanding semantics have changed.
120	root	1.86	- major rewrite, consider all functionality EXPERIMENTAL.
121	root	1.68	- aio requests can be cancelled.
122	root	1.81	- callbacks can be (re-)set later.
123	root	1.93	- aio requests can choose between 9 priorities.
124	root	1.83	- add aio_group: aio requests can be grouped
125			into composite requests.
126			- generator interface for groups.
127	root	1.89	- add IO::AIO::poll_some.
128	root	1.72	- major documentation improvements.
129			- very minor bugfixes.
130	root	1.76	- add aio_nop for dummy requests.
131	root	1.84	- add aio_busy mainly for benchmarking and debugging.
132	root	1.79	- use "fast" mutexes on linux.
133	root	1.80	- use dynamic (and larger) buffers instead of
134			putting them onto the stack.
135			- optimise x86 and amd64 a bit.
136			- better error checking when ENOMEM.
137	root	1.85	- hopefully fix mem and dirp leaks on fork.
138	root	1.92	- warn about broken perl malloc.
139	root	1.88	- compiles on cygwin (but pread is broken on cygwin
140			which is not detected by autoconf, so you have to
141			edit autoconf/config.h yourself to enable emulation).
142	root	1.68
143	root	1.67	1.8 Sat Jun 24 22:20:44 CEST 2006
144	root	1.66	- add and/or document aio_rename, aio_link, aio_symlink and aio_move.
145
146	root	1.65	1.73 Wed Mar 1 22:49:32 CET 2006
147			- codename "jost"
148			- AIX/Solaris(?) aren't being helpful again, hardcode a value
149			for NAME_MAX and drive with your eyes closed (reported by
150			wcooley@nakedape.cc).
151	root	1.63
152	root	1.62	1.72 Thu Feb 2 00:40:44 CET 2006
153	root	1.61	- another minor bug in aio_scandir, again, the callback was called
154			twice when the directory can't be stat'ed.
155
156	root	1.60	1.71 Mon Dec 26 20:20:03 CET 2005
157			- grr, another minor bug in aio_scandir, this time resulting
158			in a runtime error.
159
160	root	1.59	1.7 Mon Dec 26 19:29:48 CET 2005
161	root	1.58	- aio_scandir errornously called callback twice in some cases.
162	root	1.57	- added AnyEvent example.
163
164	root	1.55	1.61 Wed Sep 7 19:40:42 CEST 2005
165	root	1.54	- no longer include $Config{libs}, as distros include too much
166	root	1.56	garbage in there that is not installed on typical systems
167	root	1.54	(for example, debian links perl against -lgdbm and many more
168			libraries despite perl not needing it, slowing down startup and
169			wasting memory).
170
171	root	1.53	1.6 Tue Aug 30 17:44:44 CEST 2005
172			- added aio_readdir, aio_scandir.
173	root	1.51	- added aio_sendfile, including sendfile emulation when sendfile
174			isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
175			support is unavailable on my solaris 8 machine, but preliminary
176			code is there. What's lacking is configury stuff and testing...).
177	root	1.46
178	root	1.44	1.5 Sat Aug 20 02:32:19 CEST 2005
179	root	1.51	- create the aio threads on demand only (good after forking).
180	root	1.41	- somebody nagged about C89 compatibility, so this release should
181	root	1.42	be C89 compatible, but no guarantees for future ones.
182	root	1.43	- abort when the configure script fails.
183	root	1.41
184	root	1.40	1.4 Wed Aug 17 08:07:27 CEST 2005
185	root	1.93	- forgot to recreate the pipe after forking, this could cause
186	root	1.40	deadlocks.
187
188	root	1.39	1.3 Wed Aug 17 07:25:54 CEST 2005
189	root	1.33	- properly propagate exceptions from callbacks, instead of silently
190			eating them.
191	root	1.38	- use a different fork algorithm that avoids recursive callback
192			invocations and reduces fork latency in busy processes.
193	root	1.37	- fix a bug where the buffer scalar in aio_read got assigned the wrong
194			length after reading.
195			- fix a bug where the child would process some outstanding requests
196			from the parent.
197			- make a copy of the callback scalar, to avoid some very uncommon
198			(but valid) usages where the callback scalar changes.
199			- the callback was never freed in aio_read/aio_write.
200	root	1.38	- aio_read/aio_write will now set the readonly flag on the data
201			scalar for better error reporting.
202	root	1.33
203	root	1.32	1.2 Wed Aug 17 01:22:58 CEST 2005
204			- verified on cygwin, linux/amd64+ia32+alpha, solaris.
205	root	1.31	- use SvPVbyte for filenames now. You need to encode your strings to
206			the external filename encoding first.
207	root	1.32	- fix the bug where filehandles could leak (again).
208	root	1.31	- clarify freebsd situation: make it work and tell me how, or go away
209			with your underdocumented, broken and outdated OS.
210			- fork'ing should now be officially supported (where linux and
211			posix contradict each other, I followed posix).
212	root	1.32	- only call read() once per poll, not twice (speedup).
213			- new functions: aio_rmdir, aio_symlink.
214	root	1.31	- force callback arguments to be undef or a reference, for better
215			error catching.
216	root	1.1
217	root	1.29	1.1 Sun Aug 7 05:27:23 CEST 2005
218	root	1.25	- added configure script to detect availability of some calls.
219	root	1.27	(imperfect, as we cannot detect things like -lrt due to missing
220	root	1.23	feedback yet).
221	root	1.27	- emulate fdatasync via fsync, pread/pwrite via unsafe read/write
222			and readahead via manual reading on platforms lacking those.
223	root	1.19	- ported t/03_errors.t+framework by Brad Fitzpatrick
224			from Linux::AIO.
225	root	1.18	- removed XOPEN_SOURCE because stupid solaris 9 doesn't
226			compile with it enabled. Probably breaks others. Oh well.
227	root	1.24	- try to be more careful with errno on non-threaded perls.
228	root	1.26	- cygwins perl insisted on a matching open mode when morphing
229			the fd to an fh.
230	root	1.28	- convert sv's to "byte" encoding in aio_read/aio_write. Might
231			do that for pathnames, too, in the future, so make sure you
232			properly encode your pathnames.
233	root	1.18
234	root	1.17	1.0 Fri Jul 22 10:43:30 CEST 2005
235			- aio_open did not reliably deliver (open) filehandles.
236	root	1.16	- all aio_*-functions keep a reference to the filehandle so
237			it doesn't go away while the aio requests is working on it.
238			- disable warnings in AIO.pm.
239
240	root	1.15	0.9 Wed Jul 20 23:55:04 CEST 2005
241			- allow recursive calls to poll_cb, use less locking calls, too.
242			- fix the Gtk2-example in the SYNOPSIS.
243	root	1.14	- use pread/pwrite not pread64/pwrite64. this was simply a leftover
244			from Linux::AIO.
245			(found by compiling on cygwin. Unfortunately, cygwin declares but
246			does not implement pread/pwrite).
247			- only include <sys/syscall.h> on linux.
248
249	root	1.13	0.5 Tue Jul 12 13:03:09 CEST 2005
250	root	1.12	- removed #include <endian.h>, it's not portable, and we don't
251			need it anyway.
252			- link against -lrt, as it might contain goodies such as fdatasync,
253			and often aio_read, which we do not use yet, but it shouldn't hurt.
254
255	root	1.11	0.4 Mon Jul 11 05:28:25 CEST 2005
256	root	1.9	- added IO::AIO::flush, IO::AIO::poll.
257	root	1.10	- make callback argument optional for all calls.
258	root	1.8
259	root	1.7	0.3 Mon Jul 11 01:42:37 CEST 2005
260	root	1.5	- restructured manpage.
261	root	1.7	- added SYNOPSIS with examples for Event, Glib, Tk.
262			- remove explicit context support so I don't have to maintain
263			it for threaded perls (i.e. it should work now :).
264	root	1.5
265	root	1.4	0.2 Sun Jul 10 22:57:12 CEST 2005
266	root	1.2	- return immediately from poll_wait if nreqs==0.
267			- get rid of the request pipe and use faster thread-thread
268	root	1.3	communications for most requests and responses.
269	root	1.2
270	root	1.1	0.1
271			- cloned from Linux::AIO, which is very similar.
272