[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

3.17 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:	1.177
Committed:	Thu Nov 20 09:01:40 2008 UTC (15 years, 6 months ago) by root
Branch:	MAIN
CVS Tags:	rel-3_17
Changes since 1.176:	+2 -0 lines
Log Message:	3.17
#	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	1.177	3.17 Thu Nov 20 08:45:36 CET 2008
10	root	1.176	- (libeio) added aio_sync_file_range (untested).
11	root	1.177	- add aio_busy to @IO::AIO::AIO_REQ.
12	root	1.175
13	root	1.174	3.16 Wed Oct 22 18:28:01 CEST 2008
14	root	1.173	- use SvREFCNT_inc instead of SvREFCNT_inc_NN in a non-speed critical
15			part to improve portability to perl 5.8 (reported by szymon).
16
17	root	1.172	3.15 Mon Oct 13 00:39:55 CEST 2008
18	root	1.171	- automatic removal of feeders was broken.
19			- (libeio) use a more robust method to detect whether a feeder
20			has added something to the group or not.
21
22	root	1.170	3.1 Thu Oct 2 13:34:40 CEST 2008
23	root	1.168	- pre-deref the passed callback object, for increased speed
24			and decreased memory usage.
25	root	1.167	- call on_next_submit callback even for aio_group - impact unknown,
26	root	1.166	but seems more correct.
27	root	1.168	- $req->cb now returns the original callback.
28	root	1.166	- (libeio) pass EIO_GROUP/aio_group requests through the queue without
29			requiring a thread switch.
30	root	1.169	- (libeio) status code of aio_futime and aio_utime was always passed 0.
31	root	1.166	- do some other µ-optimisations.
32
33	root	1.165	3.07 Sat Aug 2 16:06:13 CEST 2008
34			- do not include LIBS in autoconf tests.
35
36	root	1.164	3.06 Tue Jul 15 12:41:32 CEST 2008
37	root	1.162	- move preadwritelock definition before it's first reference,
38	root	1.164	to make it compile again on broken platforms (they still exist)
39			or badly cofngiured perls (redhat...), reported by Rob Bloodgood.
40	root	1.162
41	root	1.161	3.05 Thu Jun 19 23:23:52 CEST 2008
42	root	1.160	- work around perl overriding readdir etc. with thread-unsafe
43	root	1.161	(sic!) versions.
44	root	1.160
45	root	1.159	3.04 Wed Jun 18 01:35:38 CEST 2008
46			- (libeio) fix eio_mknod, which confused it's arguments.
47	root	1.158	- (libeio) do not use readdir_r, as Ulrich Drepper pointed out that this
48			is stupid.
49	root	1.159	- (libeio) fix eio__readahead prototype, patch by Jost Krieger.
50			- (libeio) fix a bug that could potentially cause IO::AIO
51			not to get initialised properly.
52	root	1.158
53	root	1.157	3.03 Thu May 29 05:33:30 CEST 2008
54	root	1.153	- (libeio) correctly call pthread_attr_destroy ().
55	root	1.155	- (libeio) work around broken bsd headers once more.
56	root	1.154	- reduce shared library size again by not including wrappers.
57	root	1.156	- max_outstanding could cause poll to enter a busy-waiting loop.
58			- document the new IO::AIO::poll_cb result value.
59	root	1.153
60	root	1.152	3.02 Mon May 12 02:32:02 CEST 2008
61	root	1.150	- fix a memory leak on aio_readlink.
62			- bring back working fchmod.
63	root	1.151	- nop and busy now set result to 0.
64			- set errno to ENOMEM when allocation fails.
65	root	1.150
66	root	1.149	3.01 Sun May 11 03:07:03 CEST 2008
67			- (libeio) make it compile on systems without readahead or readdir_r.
68	root	1.148	- (libeio) improve configure check for readahead availability.
69			- do not try to link against -lrt.
70	root	1.147	- use a separate configure script for IO::AIO (not the libeio one).
71
72	root	1.146	3.0 Sun May 11 00:57:14 CEST 2008
73	root	1.145	- added bin/treescan to the distribution.
74			- switched to using libeio.
75			- LOTS OF INCOMPATIBLE CHANGES:
76			- remove signal functionality, it is not worth the effort.
77			- max_outstanding no longer returns the previous number of requests.
78			- poll_cb no longer returns number of requests.
79	root	1.143
80	root	1.142	2.62 Sat Apr 26 13:59:33 CEST 2008
81	root	1.141	- port to solaris perls configured for old posix
82			(analysed by Jost Krieger).
83	root	1.142	- keep a reference to the perl filehandle object in aio_close,
84			so it doesn't get closed prematurely, leading to ugly races.
85	root	1.141
86	root	1.140	2.61 Wed Apr 16 18:45:02 CEST 2008
87	root	1.137	- fix treescan output duplication and improve output ordering.
88			also display files given on the commandline.
89	root	1.140	- use a different algorithm for aio_close that is faster
90			and probably has even lower chances of blocking.
91	root	1.138	- do our own stack memory management for threads - linux
92			allocates outrageous amounts of VM (not so bad unless you
93			use mlockall...), which severely limits the number of threads
94	root	1.139	on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
95			and 4096 * sizeof (long) (usually this is 16..64k).
96	root	1.137
97	root	1.136	2.6 Sun Mar 30 08:28:11 CEST 2008
98	root	1.134	- added aio_sync.
99	root	1.135	- added aio_pathsync.
100	root	1.136	- fix prototypes of (void) functions.
101	root	1.134
102	root	1.133	2.51 Sat Oct 6 16:04:54 CEST 2007
103			- perlio isn't generally threadsafe, so aio_close could not work reliably.
104			aio_close now tries a safe hack that might not be that asynchronous
105			(see the manpage for details).
106			- discard callback return values as to not grow the stack endlessly
107			when poll_cb handles many requests without returning.
108			- minor code cleanups.
109
110	root	1.132	2.5 Thu Oct 4 14:49:08 CEST 2007
111	root	1.131	- replaced _fd2fh with faster xs code.
112			- aio_close will now try to do "the right thing" and thus might
113			work sensibly for the very first time.
114
115	root	1.130	2.41 Mon Sep 24 21:28:21 CEST 2007
116	root	1.129	- after fork, invest some work to make sure that the poll_fileno
117			stays stable (by dup2'ing the new fd over the old one), to make
118			it easier for programs/libs that don't control their forking
119			behaviour and cannot recreate their watchers.
120
121	root	1.128	2.4 Sun Aug 5 18:44:22 CEST 2007
122	root	1.127	- add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
123			successfully demonstrated that you can block on futimes...).
124	root	1.124	- allow undef as fileoffset for aio_read/write and use read/write(2)
125			internally (useful for sockets or O_APPEND handles).
126	root	1.126	- allow undef for length in aio_write.
127			- negative dataoffsets work as expected now in aio_read/aio_write.
128	root	1.124	- use NV instead of UV for 32 bit perls and file offsets, as NVs
129	root	1.125	have a larger range then.
130	root	1.120	- shared code between BDB and IO::AIO.
131	root	1.127	- aio_busy was completely broken. now fixed.
132			- readahead emulation now returns something.
133	root	1.121	- correctly set errno to ENOSYS on unimplemented functions
134			(should never happen, though).
135	root	1.127	- large changes to make it partially compile and run on win32,
136			but win32 lacks too much functionality, and perl overrides way
137			too many functions with crashing versions.
138	root	1.120
139	root	1.119	2.33 Tue Jan 23 23:55:41 CET 2007
140			- fix install path (Andreas J. Koenig).
141
142	root	1.118	2.32 Mon Jan 22 16:56:23 CET 2007
143	root	1.114	- added aio_rmtree.
144	root	1.115	- wow, aio_mkdir was missing.
145	root	1.116	- aio_load did return undef on error, not -1.
146	root	1.117	- use prefixexp not prefix in autoconf.pm
147			(suggested by ... rt.cpan.org unreachable).
148	root	1.118	- avoid installing autoconf.pm.
149	root	1.114
150	root	1.113	2.31 Sat Jan 6 03:46:02 CET 2007
151	root	1.112	- added aio_load.
152
153	root	1.111	2.3 Sat Dec 23 05:48:07 CET 2006
154			- fix off-by-one bug in aio_read, causing memory corruption
155			or crashes.
156
157	root	1.110	2.21 Fri Dec 22 05:03:38 CET 2006
158	root	1.108	- minor doc updates.
159	root	1.107	- minor cleanups.
160			- IO::AIO::poll returns request count.
161	root	1.109	- undocumented and unfinished async-signal-reporting.
162	root	1.107
163	root	1.103	2.2 Tue Oct 31 00:31:00 CET 2006
164	root	1.100	- minor doc updates.
165	root	1.101	- added aio_readlink.
166			- properly zero-terminate aio_read buffer.
167			- fix aio_read/write with nonzero dataoffset.
168	root	1.104	- reduced size of aio request structure.
169	root	1.106	- better diagnostics when pathnames etc. are not byte-encoded;
170	root	1.105	do not leak request in that case, either.
171	root	1.94
172	root	1.99	2.1 Sun Oct 29 02:01:57 CET 2006
173	root	1.98	- INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
174			IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
175	root	1.95	- fix a bug in aio_move where it would fail everytime
176			it would have to copy files manually.
177	root	1.98	- doc updates.
178	root	1.94	- start threads only on (very low) demand.
179	root	1.97	- end superfluous threads automatically after 10s idling.
180	root	1.98	- add IO::AIO::max_idle to control this.
181	root	1.94	- some tuning applied to random places.
182	root	1.95	- add aio_mknod.
183	root	1.59
184	root	1.92	2.0 Thu Oct 26 18:27:58 CEST 2006
185	root	1.90	- minor incompatibility: max_outstanding semantics have changed.
186	root	1.86	- major rewrite, consider all functionality EXPERIMENTAL.
187	root	1.68	- aio requests can be cancelled.
188	root	1.81	- callbacks can be (re-)set later.
189	root	1.93	- aio requests can choose between 9 priorities.
190	root	1.83	- add aio_group: aio requests can be grouped
191			into composite requests.
192			- generator interface for groups.
193	root	1.89	- add IO::AIO::poll_some.
194	root	1.72	- major documentation improvements.
195			- very minor bugfixes.
196	root	1.76	- add aio_nop for dummy requests.
197	root	1.84	- add aio_busy mainly for benchmarking and debugging.
198	root	1.79	- use "fast" mutexes on linux.
199	root	1.80	- use dynamic (and larger) buffers instead of
200			putting them onto the stack.
201			- optimise x86 and amd64 a bit.
202			- better error checking when ENOMEM.
203	root	1.85	- hopefully fix mem and dirp leaks on fork.
204	root	1.92	- warn about broken perl malloc.
205	root	1.88	- compiles on cygwin (but pread is broken on cygwin
206			which is not detected by autoconf, so you have to
207			edit autoconf/config.h yourself to enable emulation).
208	root	1.68
209	root	1.67	1.8 Sat Jun 24 22:20:44 CEST 2006
210	root	1.66	- add and/or document aio_rename, aio_link, aio_symlink and aio_move.
211
212	root	1.65	1.73 Wed Mar 1 22:49:32 CET 2006
213			- codename "jost"
214			- AIX/Solaris(?) aren't being helpful again, hardcode a value
215			for NAME_MAX and drive with your eyes closed (reported by
216			wcooley@nakedape.cc).
217	root	1.63
218	root	1.62	1.72 Thu Feb 2 00:40:44 CET 2006
219	root	1.61	- another minor bug in aio_scandir, again, the callback was called
220			twice when the directory can't be stat'ed.
221
222	root	1.60	1.71 Mon Dec 26 20:20:03 CET 2005
223			- grr, another minor bug in aio_scandir, this time resulting
224			in a runtime error.
225
226	root	1.59	1.7 Mon Dec 26 19:29:48 CET 2005
227	root	1.58	- aio_scandir errornously called callback twice in some cases.
228	root	1.57	- added AnyEvent example.
229
230	root	1.55	1.61 Wed Sep 7 19:40:42 CEST 2005
231	root	1.54	- no longer include $Config{libs}, as distros include too much
232	root	1.56	garbage in there that is not installed on typical systems
233	root	1.54	(for example, debian links perl against -lgdbm and many more
234			libraries despite perl not needing it, slowing down startup and
235			wasting memory).
236
237	root	1.53	1.6 Tue Aug 30 17:44:44 CEST 2005
238			- added aio_readdir, aio_scandir.
239	root	1.51	- added aio_sendfile, including sendfile emulation when sendfile
240			isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
241			support is unavailable on my solaris 8 machine, but preliminary
242			code is there. What's lacking is configury stuff and testing...).
243	root	1.46
244	root	1.44	1.5 Sat Aug 20 02:32:19 CEST 2005
245	root	1.51	- create the aio threads on demand only (good after forking).
246	root	1.41	- somebody nagged about C89 compatibility, so this release should
247	root	1.42	be C89 compatible, but no guarantees for future ones.
248	root	1.43	- abort when the configure script fails.
249	root	1.41
250	root	1.40	1.4 Wed Aug 17 08:07:27 CEST 2005
251	root	1.93	- forgot to recreate the pipe after forking, this could cause
252	root	1.40	deadlocks.
253
254	root	1.39	1.3 Wed Aug 17 07:25:54 CEST 2005
255	root	1.33	- properly propagate exceptions from callbacks, instead of silently
256			eating them.
257	root	1.38	- use a different fork algorithm that avoids recursive callback
258			invocations and reduces fork latency in busy processes.
259	root	1.37	- fix a bug where the buffer scalar in aio_read got assigned the wrong
260			length after reading.
261			- fix a bug where the child would process some outstanding requests
262			from the parent.
263			- make a copy of the callback scalar, to avoid some very uncommon
264			(but valid) usages where the callback scalar changes.
265			- the callback was never freed in aio_read/aio_write.
266	root	1.38	- aio_read/aio_write will now set the readonly flag on the data
267			scalar for better error reporting.
268	root	1.33
269	root	1.32	1.2 Wed Aug 17 01:22:58 CEST 2005
270			- verified on cygwin, linux/amd64+ia32+alpha, solaris.
271	root	1.31	- use SvPVbyte for filenames now. You need to encode your strings to
272			the external filename encoding first.
273	root	1.32	- fix the bug where filehandles could leak (again).
274	root	1.31	- clarify freebsd situation: make it work and tell me how, or go away
275			with your underdocumented, broken and outdated OS.
276			- fork'ing should now be officially supported (where linux and
277			posix contradict each other, I followed posix).
278	root	1.32	- only call read() once per poll, not twice (speedup).
279			- new functions: aio_rmdir, aio_symlink.
280	root	1.31	- force callback arguments to be undef or a reference, for better
281			error catching.
282	root	1.1
283	root	1.29	1.1 Sun Aug 7 05:27:23 CEST 2005
284	root	1.25	- added configure script to detect availability of some calls.
285	root	1.27	(imperfect, as we cannot detect things like -lrt due to missing
286	root	1.23	feedback yet).
287	root	1.27	- emulate fdatasync via fsync, pread/pwrite via unsafe read/write
288			and readahead via manual reading on platforms lacking those.
289	root	1.19	- ported t/03_errors.t+framework by Brad Fitzpatrick
290			from Linux::AIO.
291	root	1.18	- removed XOPEN_SOURCE because stupid solaris 9 doesn't
292			compile with it enabled. Probably breaks others. Oh well.
293	root	1.24	- try to be more careful with errno on non-threaded perls.
294	root	1.26	- cygwins perl insisted on a matching open mode when morphing
295			the fd to an fh.
296	root	1.28	- convert sv's to "byte" encoding in aio_read/aio_write. Might
297			do that for pathnames, too, in the future, so make sure you
298			properly encode your pathnames.
299	root	1.18
300	root	1.17	1.0 Fri Jul 22 10:43:30 CEST 2005
301			- aio_open did not reliably deliver (open) filehandles.
302	root	1.16	- all aio_*-functions keep a reference to the filehandle so
303			it doesn't go away while the aio requests is working on it.
304			- disable warnings in AIO.pm.
305
306	root	1.15	0.9 Wed Jul 20 23:55:04 CEST 2005
307			- allow recursive calls to poll_cb, use less locking calls, too.
308			- fix the Gtk2-example in the SYNOPSIS.
309	root	1.14	- use pread/pwrite not pread64/pwrite64. this was simply a leftover
310			from Linux::AIO.
311			(found by compiling on cygwin. Unfortunately, cygwin declares but
312			does not implement pread/pwrite).
313			- only include <sys/syscall.h> on linux.
314
315	root	1.13	0.5 Tue Jul 12 13:03:09 CEST 2005
316	root	1.12	- removed #include <endian.h>, it's not portable, and we don't
317			need it anyway.
318			- link against -lrt, as it might contain goodies such as fdatasync,
319			and often aio_read, which we do not use yet, but it shouldn't hurt.
320
321	root	1.11	0.4 Mon Jul 11 05:28:25 CEST 2005
322	root	1.9	- added IO::AIO::flush, IO::AIO::poll.
323	root	1.10	- make callback argument optional for all calls.
324	root	1.8
325	root	1.7	0.3 Mon Jul 11 01:42:37 CEST 2005
326	root	1.5	- restructured manpage.
327	root	1.7	- added SYNOPSIS with examples for Event, Glib, Tk.
328			- remove explicit context support so I don't have to maintain
329			it for threaded perls (i.e. it should work now :).
330	root	1.5
331	root	1.4	0.2 Sun Jul 10 22:57:12 CEST 2005
332	root	1.2	- return immediately from poll_wait if nreqs==0.
333			- get rid of the request pipe and use faster thread-thread
334	root	1.3	communications for most requests and responses.
335	root	1.2
336	root	1.1	0.1
337			- cloned from Linux::AIO, which is very similar.
338