[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

3.22 Sat Jun 13 15:32:40 CEST 2009
        - speed up readdirx sort algorithm slightly.
        - bin/treescan was missing from distro tarball.

3.21 Fri Jun 12 18:45:53 CEST 2009
        - new options --dirs and --files for treescan.
        - install bin/treescan by default.
        - (libeio) aio_readdir can now be cancelled while executing.
        - fix a printf format string for 64 bit systems (could lead
          to problems on big endian 64 bit systems).
        - do not use qsort() but our own algorithm: glibc initialises
          the whole locale and I/O subsystem inside qsort, causing
          a stack overflow on 32 bit machines. The new sort uses much less
          stack and is more than twice as fast in typical situations.

3.2  Sun Jun  7 20:30:05 CEST 2009
        - (libeio) pwrite emulation was even more flawed than intended and did
          not restore the file offset.
        - add aio_readdirx, which can return inode and filetype and sort
          the names in various ways.
        - unfortunately, utime, chmod, chown on an open file that has just
          been written can easily block, which caused aio_copy to block the
          process. no more!
        - no longer rely on dst path in aio_copy when futime is available.

3.19 Tue Apr 21 22:05:21 CEST 2009
        - more perl 5.10 workarounds for aio_read and write.
        - aio_write no longer modifies the sv (if possible).
        - aio_read now works correctly with magic values.

3.18 Sun Apr 19 21:17:32 CEST 2009
        - better diagnostics when some aio_* functions get passed an illegal fh.
        - try to avoid crashes due to incompatible 5.10 API changes. grmbl.

3.17 Thu Nov 20 08:45:36 CET 2008
        - (libeio) added aio_sync_file_range (untested).
        - add aio_busy to @IO::AIO::AIO_REQ.

3.16 Wed Oct 22 18:28:01 CEST 2008
        - use SvREFCNT_inc instead of SvREFCNT_inc_NN in a non-speed critical
          part to improve portability to perl 5.8 (reported by szymon).

3.15 Mon Oct 13 00:39:55 CEST 2008
        - automatic removal of feeders was broken.
        - (libeio) use a more robust method to detect whether a feeder
          has added something to the group or not.

3.1  Thu Oct  2 13:34:40 CEST 2008
        - pre-deref the passed callback object, for increased speed
          and decreased memory usage.
        - call on_next_submit callback even for aio_group - impact unknown,
          but seems more correct.
        - $req->cb now returns the original callback.
        - (libeio) pass EIO_GROUP/aio_group requests through the queue without
          requiring a thread switch.
        - (libeio) status code of aio_futime and aio_utime was always passed 0.
        - do some other µ-optimisations.

3.07 Sat Aug  2 16:06:13 CEST 2008
        - do not include LIBS in autoconf tests.

3.06 Tue Jul 15 12:41:32 CEST 2008
        - move preadwritelock definition before it's first reference,
          to make it compile again on broken platforms (they still exist)
          or badly cofngiured perls (redhat...), reported by Rob Bloodgood.

3.05 Thu Jun 19 23:23:52 CEST 2008
        - work around perl overriding readdir etc. with thread-unsafe
          (sic!) versions.

3.04 Wed Jun 18 01:35:38 CEST 2008
        - (libeio) fix eio_mknod, which confused it's arguments.
        - (libeio) do not use readdir_r, as Ulrich Drepper pointed out that this
          is stupid.
        - (libeio) fix eio__readahead prototype, patch by Jost Krieger.
        - (libeio) fix a bug that could potentially cause IO::AIO
          not to get initialised properly.

3.03 Thu May 29 05:33:30 CEST 2008
        - (libeio) correctly call pthread_attr_destroy ().
        - (libeio) work around broken bsd headers once more.
        - reduce shared library size again by not including wrappers.
        - max_outstanding could cause poll to enter a busy-waiting loop.
        - document the new IO::AIO::poll_cb result value.

3.02 Mon May 12 02:32:02 CEST 2008
        - fix a memory leak on aio_readlink.
        - bring back working fchmod.
        - nop and busy now set result to 0.
        - set errno to ENOMEM when allocation fails.

3.01 Sun May 11 03:07:03 CEST 2008
        - (libeio) make it compile on systems without readahead or readdir_r.
        - (libeio) improve configure check for readahead availability.
        - do not try to link against -lrt.
        - use a separate configure script for IO::AIO (not the libeio one).

3.0  Sun May 11 00:57:14 CEST 2008
        - added bin/treescan to the distribution.
        - switched to using libeio.
        - LOTS OF INCOMPATIBLE CHANGES:
          - remove signal functionality, it is not worth the effort.
          - max_outstanding no longer returns the previous number of requests.
          - poll_cb no longer returns number of requests.

2.62 Sat Apr 26 13:59:33 CEST 2008
        - port to solaris perls configured for old posix
          (analysed by Jost Krieger).
        - keep a reference to the perl filehandle object in aio_close,
          so it doesn't get closed prematurely, leading to ugly races.

2.61 Wed Apr 16 18:45:02 CEST 2008
        - fix treescan output duplication and improve output ordering.
          also display files given on the commandline.
        - use a different algorithm for aio_close that is faster
          and probably has even lower chances of blocking.
        - do our own stack memory management for threads - linux
          allocates outrageous amounts of VM (not so bad unless you
          use mlockall...), which severely limits the number of threads
          on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
          and 4096 * sizeof (long) (usually this is 16..64k).

2.6  Sun Mar 30 08:28:11 CEST 2008
        - added aio_sync.
        - added aio_pathsync.
        - fix prototypes of (void) functions.

2.51 Sat Oct  6 16:04:54 CEST 2007
        - perlio isn't generally threadsafe, so aio_close could not work reliably.
          aio_close now tries a safe hack that might not be that asynchronous
          (see the manpage for details).
        - discard callback return values as to not grow the stack endlessly
          when poll_cb handles many requests without returning.
        - minor code cleanups.

2.5  Thu Oct  4 14:49:08 CEST 2007
        - replaced _fd2fh with faster xs code.
        - aio_close will now try to do "the right thing" and thus might
          work sensibly for the very first time.

2.41 Mon Sep 24 21:28:21 CEST 2007
        - after fork, invest some work to make sure that the poll_fileno
          stays stable (by dup2'ing the new fd over the old one), to make
          it easier for programs/libs that don't control their forking
          behaviour and cannot recreate their watchers.

2.4  Sun Aug  5 18:44:22 CEST 2007
        - add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
          successfully demonstrated that you can block on futimes...).
        - allow undef as fileoffset for aio_read/write and use read/write(2)
          internally (useful for sockets or O_APPEND handles).
        - allow undef for length in aio_write.
        - negative dataoffsets work as expected now in aio_read/aio_write.
        - use NV instead of UV for 32 bit perls and file offsets, as NVs
          have a larger range then.
        - shared code between BDB and IO::AIO.
        - aio_busy was completely broken. now fixed.
        - readahead emulation now returns something.
        - correctly set errno to ENOSYS on unimplemented functions
          (should never happen, though).
        - large changes to make it partially compile and run on win32,
          but win32 lacks too much functionality, and perl overrides way
          too many functions with crashing versions.

2.33 Tue Jan 23 23:55:41 CET 2007
        - fix install path (Andreas J. Koenig).

2.32 Mon Jan 22 16:56:23 CET 2007
        - added aio_rmtree.
        - wow, aio_mkdir was missing.
        - aio_load did return undef on error, not -1.
        - use prefixexp not prefix in autoconf.pm
          (suggested by ... rt.cpan.org unreachable).
        - avoid installing autoconf.pm.

2.31 Sat Jan  6 03:46:02 CET 2007
        - added aio_load.

2.3  Sat Dec 23 05:48:07 CET 2006
        - fix off-by-one bug in aio_read, causing memory corruption
          or crashes.

2.21  Fri Dec 22 05:03:38 CET 2006
        - minor doc updates.
        - minor cleanups.
        - IO::AIO::poll returns request count.
        - undocumented and unfinished async-signal-reporting.

2.2  Tue Oct 31 00:31:00 CET 2006
        - minor doc updates.
        - added aio_readlink.
        - properly zero-terminate aio_read buffer.
        - fix aio_read/write with nonzero dataoffset.
        - reduced size of aio request structure.
        - better diagnostics when pathnames etc. are not byte-encoded;
          do not leak request in that case, either.

2.1  Sun Oct 29 02:01:57 CET 2006
        - INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
          IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
        - fix a bug in aio_move where it would fail everytime
          it would have to copy files manually.
        - doc updates.
        - start threads only on (very low) demand.
        - end superfluous threads automatically after 10s idling.
        - add IO::AIO::max_idle to control this.
        - some tuning applied to random places.
        - add aio_mknod.

2.0  Thu Oct 26 18:27:58 CEST 2006
        - minor incompatibility: max_outstanding semantics have changed.
        - major rewrite, consider all functionality EXPERIMENTAL.
        - aio requests can be cancelled.
        - callbacks can be (re-)set later.
        - aio requests can choose between 9 priorities.
        - add aio_group: aio requests can be grouped
          into composite requests.
        - generator interface for groups.
        - add IO::AIO::poll_some.
        - major documentation improvements.
        - very minor bugfixes.
        - add aio_nop for dummy requests.
        - add aio_busy mainly for benchmarking and debugging.
        - use "fast" mutexes on linux.
        - use dynamic (and larger) buffers instead of
          putting them onto the stack.
        - optimise x86 and amd64 a bit.
        - better error checking when ENOMEM.
        - hopefully fix mem and dirp leaks on fork.
        - warn about broken perl malloc.
        - compiles on cygwin (but pread is broken on cygwin
          which is not detected by autoconf, so you have to
          edit autoconf/config.h yourself to enable emulation).

1.8  Sat Jun 24 22:20:44 CEST 2006
        - add and/or document aio_rename, aio_link, aio_symlink and aio_move.

1.73 Wed Mar  1 22:49:32 CET 2006
        - codename "jost"
        - AIX/Solaris(?) aren't being helpful again, hardcode a value
          for NAME_MAX and drive with your eyes closed (reported by
          wcooley@nakedape.cc).

1.72 Thu Feb  2 00:40:44 CET 2006
        - another minor bug in aio_scandir, again, the callback was called
          twice when the directory can't be stat'ed.

1.71 Mon Dec 26 20:20:03 CET 2005
        - grr, another minor bug in aio_scandir, this time resulting
          in a runtime error.

1.7  Mon Dec 26 19:29:48 CET 2005
        - aio_scandir errornously called callback twice in some cases.
        - added AnyEvent example.

1.61 Wed Sep  7 19:40:42 CEST 2005
        - no longer include $Config{libs}, as distros include too much
          garbage in there that is not installed on typical systems
          (for example, debian links perl against -lgdbm and many more
          libraries despite perl not needing it, slowing down startup and
          wasting memory).

1.6  Tue Aug 30 17:44:44 CEST 2005
        - added aio_readdir, aio_scandir.
        - added aio_sendfile, including sendfile emulation when sendfile
          isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
          support is unavailable on my solaris 8 machine, but preliminary
          code is there. What's lacking is configury stuff and testing...).

1.5  Sat Aug 20 02:32:19 CEST 2005
        - create the aio threads on demand only (good after forking).
        - somebody nagged about C89 compatibility, so this release should
          be C89 compatible, but no guarantees for future ones.
        - abort when the configure script fails.

1.4  Wed Aug 17 08:07:27 CEST 2005
        - forgot to recreate the pipe after forking, this could cause
          deadlocks.

1.3  Wed Aug 17 07:25:54 CEST 2005
        - properly propagate exceptions from callbacks, instead of silently
          eating them.
        - use a different fork algorithm that avoids recursive callback
          invocations and reduces fork latency in busy processes.
        - fix a bug where the buffer scalar in aio_read got assigned the wrong
          length after reading.
        - fix a bug where the child would process some outstanding requests
          from the parent.
        - make a copy of the callback scalar, to avoid some very uncommon
          (but valid) usages where the callback scalar changes.
        - the callback was never freed in aio_read/aio_write.
        - aio_read/aio_write will now set the readonly flag on the data
          scalar for better error reporting.

1.2  Wed Aug 17 01:22:58 CEST 2005
        - verified on cygwin, linux/amd64+ia32+alpha, solaris.
        - use SvPVbyte for filenames now. You *need* to encode your strings to
          the external filename encoding first.
        - fix the bug where filehandles could leak (again).
        - clarify freebsd situation: make it work and tell me how, or go away
          with your underdocumented, broken and outdated OS.
        - fork'ing should now be officially supported (where linux and
          posix contradict each other, I followed posix).
        - only call read() once per poll, not twice (speedup).
        - new functions: aio_rmdir, aio_symlink.
        - force callback arguments to be undef or a reference, for better
          error catching.

1.1  Sun Aug  7 05:27:23 CEST 2005
        - added configure script to detect availability of some calls.
          (imperfect, as we cannot detect things like -lrt due to missing
          feedback yet).
        - emulate fdatasync via fsync, pread/pwrite via unsafe read/write
          and readahead via manual reading on platforms lacking those.
        - ported t/03_errors.t+framework by Brad Fitzpatrick
          from Linux::AIO.
        - removed XOPEN_SOURCE because stupid solaris 9 doesn't
          compile with it enabled. Probably breaks others. Oh well.
        - try to be more careful with errno on non-threaded perls.
        - cygwins perl insisted on a matching open mode when morphing
          the fd to an fh.
        - convert sv's to "byte" encoding in aio_read/aio_write. Might
          do that for pathnames, too, in the future, so make sure you
          properly encode your pathnames.

1.0  Fri Jul 22 10:43:30 CEST 2005
        - aio_open did not reliably deliver (open) filehandles.
        - all aio_*-functions keep a reference to the filehandle so
          it doesn't go away while the aio requests is working on it.
        - disable warnings in AIO.pm.

0.9  Wed Jul 20 23:55:04 CEST 2005
        - allow recursive calls to poll_cb, use less locking calls, too.
        - fix the Gtk2-example in the SYNOPSIS.
        - use pread/pwrite not pread64/pwrite64. this was simply a leftover
          from Linux::AIO.
          (found by compiling on cygwin. Unfortunately, cygwin declares but
          does not implement pread/pwrite).
        - only include <sys/syscall.h> on linux.

0.5  Tue Jul 12 13:03:09 CEST 2005
        - removed #include <endian.h>, it's not portable, and we don't
          need it anyway.
        - link against -lrt, as it might contain goodies such as fdatasync,
          and often aio_read, which we do not use yet, but it shouldn't hurt.

0.4  Mon Jul 11 05:28:25 CEST 2005
        - added IO::AIO::flush, IO::AIO::poll.
        - make callback argument optional for all calls.

0.3  Mon Jul 11 01:42:37 CEST 2005
        - restructured manpage.
        - added SYNOPSIS with examples for Event, Glib, Tk.
        - remove explicit context support so I don't have to maintain
          it for threaded perls (i.e. it should work now :).

0.2  Sun Jul 10 22:57:12 CEST 2005
        - return immediately from poll_wait if nreqs==0.
        - get rid of the request pipe and use faster thread-thread
          communications for most requests and responses.

0.1
        - cloned from Linux::AIO, which is very similar.

Revision:	1.192
Committed:	Sat Jun 13 13:33:00 2009 UTC (14 years, 11 months ago) by root
Branch:	MAIN
CVS Tags:	rel-3_22
Changes since 1.191:	+2 -0 lines
Log Message:	3.22
#	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	1.192	3.22 Sat Jun 13 15:32:40 CEST 2009
10	root	1.191	- speed up readdirx sort algorithm slightly.
11	root	1.192	- bin/treescan was missing from distro tarball.
12	root	1.191
13	root	1.190	3.21 Fri Jun 12 18:45:53 CEST 2009
14	root	1.187	- new options --dirs and --files for treescan.
15	root	1.188	- install bin/treescan by default.
16	root	1.189	- (libeio) aio_readdir can now be cancelled while executing.
17	root	1.190	- fix a printf format string for 64 bit systems (could lead
18			to problems on big endian 64 bit systems).
19			- do not use qsort() but our own algorithm: glibc initialises
20			the whole locale and I/O subsystem inside qsort, causing
21			a stack overflow on 32 bit machines. The new sort uses much less
22			stack and is more than twice as fast in typical situations.
23	root	1.187
24	root	1.186	3.2 Sun Jun 7 20:30:05 CEST 2009
25	root	1.182	- (libeio) pwrite emulation was even more flawed than intended and did
26			not restore the file offset.
27	root	1.183	- add aio_readdirx, which can return inode and filetype and sort
28			the names in various ways.
29	root	1.182	- unfortunately, utime, chmod, chown on an open file that has just
30			been written can easily block, which caused aio_copy to block the
31			process. no more!
32			- no longer rely on dst path in aio_copy when futime is available.
33
34	root	1.181	3.19 Tue Apr 21 22:05:21 CEST 2009
35			- more perl 5.10 workarounds for aio_read and write.
36			- aio_write no longer modifies the sv (if possible).
37			- aio_read now works correctly with magic values.
38
39	root	1.180	3.18 Sun Apr 19 21:17:32 CEST 2009
40	root	1.179	- better diagnostics when some aio_* functions get passed an illegal fh.
41	root	1.180	- try to avoid crashes due to incompatible 5.10 API changes. grmbl.
42	root	1.178
43	root	1.177	3.17 Thu Nov 20 08:45:36 CET 2008
44	root	1.176	- (libeio) added aio_sync_file_range (untested).
45	root	1.177	- add aio_busy to @IO::AIO::AIO_REQ.
46	root	1.175
47	root	1.174	3.16 Wed Oct 22 18:28:01 CEST 2008
48	root	1.173	- use SvREFCNT_inc instead of SvREFCNT_inc_NN in a non-speed critical
49			part to improve portability to perl 5.8 (reported by szymon).
50
51	root	1.172	3.15 Mon Oct 13 00:39:55 CEST 2008
52	root	1.171	- automatic removal of feeders was broken.
53			- (libeio) use a more robust method to detect whether a feeder
54			has added something to the group or not.
55
56	root	1.170	3.1 Thu Oct 2 13:34:40 CEST 2008
57	root	1.168	- pre-deref the passed callback object, for increased speed
58			and decreased memory usage.
59	root	1.167	- call on_next_submit callback even for aio_group - impact unknown,
60	root	1.166	but seems more correct.
61	root	1.168	- $req->cb now returns the original callback.
62	root	1.166	- (libeio) pass EIO_GROUP/aio_group requests through the queue without
63			requiring a thread switch.
64	root	1.169	- (libeio) status code of aio_futime and aio_utime was always passed 0.
65	root	1.166	- do some other µ-optimisations.
66
67	root	1.165	3.07 Sat Aug 2 16:06:13 CEST 2008
68			- do not include LIBS in autoconf tests.
69
70	root	1.164	3.06 Tue Jul 15 12:41:32 CEST 2008
71	root	1.162	- move preadwritelock definition before it's first reference,
72	root	1.164	to make it compile again on broken platforms (they still exist)
73			or badly cofngiured perls (redhat...), reported by Rob Bloodgood.
74	root	1.162
75	root	1.161	3.05 Thu Jun 19 23:23:52 CEST 2008
76	root	1.160	- work around perl overriding readdir etc. with thread-unsafe
77	root	1.161	(sic!) versions.
78	root	1.160
79	root	1.159	3.04 Wed Jun 18 01:35:38 CEST 2008
80			- (libeio) fix eio_mknod, which confused it's arguments.
81	root	1.158	- (libeio) do not use readdir_r, as Ulrich Drepper pointed out that this
82			is stupid.
83	root	1.159	- (libeio) fix eio__readahead prototype, patch by Jost Krieger.
84			- (libeio) fix a bug that could potentially cause IO::AIO
85			not to get initialised properly.
86	root	1.158
87	root	1.157	3.03 Thu May 29 05:33:30 CEST 2008
88	root	1.153	- (libeio) correctly call pthread_attr_destroy ().
89	root	1.155	- (libeio) work around broken bsd headers once more.
90	root	1.154	- reduce shared library size again by not including wrappers.
91	root	1.156	- max_outstanding could cause poll to enter a busy-waiting loop.
92			- document the new IO::AIO::poll_cb result value.
93	root	1.153
94	root	1.152	3.02 Mon May 12 02:32:02 CEST 2008
95	root	1.150	- fix a memory leak on aio_readlink.
96			- bring back working fchmod.
97	root	1.151	- nop and busy now set result to 0.
98			- set errno to ENOMEM when allocation fails.
99	root	1.150
100	root	1.149	3.01 Sun May 11 03:07:03 CEST 2008
101			- (libeio) make it compile on systems without readahead or readdir_r.
102	root	1.148	- (libeio) improve configure check for readahead availability.
103			- do not try to link against -lrt.
104	root	1.147	- use a separate configure script for IO::AIO (not the libeio one).
105
106	root	1.146	3.0 Sun May 11 00:57:14 CEST 2008
107	root	1.145	- added bin/treescan to the distribution.
108			- switched to using libeio.
109			- LOTS OF INCOMPATIBLE CHANGES:
110			- remove signal functionality, it is not worth the effort.
111			- max_outstanding no longer returns the previous number of requests.
112			- poll_cb no longer returns number of requests.
113	root	1.143
114	root	1.142	2.62 Sat Apr 26 13:59:33 CEST 2008
115	root	1.141	- port to solaris perls configured for old posix
116			(analysed by Jost Krieger).
117	root	1.142	- keep a reference to the perl filehandle object in aio_close,
118			so it doesn't get closed prematurely, leading to ugly races.
119	root	1.141
120	root	1.140	2.61 Wed Apr 16 18:45:02 CEST 2008
121	root	1.137	- fix treescan output duplication and improve output ordering.
122			also display files given on the commandline.
123	root	1.140	- use a different algorithm for aio_close that is faster
124			and probably has even lower chances of blocking.
125	root	1.138	- do our own stack memory management for threads - linux
126			allocates outrageous amounts of VM (not so bad unless you
127			use mlockall...), which severely limits the number of threads
128	root	1.139	on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
129			and 4096 * sizeof (long) (usually this is 16..64k).
130	root	1.137
131	root	1.136	2.6 Sun Mar 30 08:28:11 CEST 2008
132	root	1.134	- added aio_sync.
133	root	1.135	- added aio_pathsync.
134	root	1.136	- fix prototypes of (void) functions.
135	root	1.134
136	root	1.133	2.51 Sat Oct 6 16:04:54 CEST 2007
137			- perlio isn't generally threadsafe, so aio_close could not work reliably.
138			aio_close now tries a safe hack that might not be that asynchronous
139			(see the manpage for details).
140			- discard callback return values as to not grow the stack endlessly
141			when poll_cb handles many requests without returning.
142			- minor code cleanups.
143
144	root	1.132	2.5 Thu Oct 4 14:49:08 CEST 2007
145	root	1.131	- replaced _fd2fh with faster xs code.
146			- aio_close will now try to do "the right thing" and thus might
147			work sensibly for the very first time.
148
149	root	1.130	2.41 Mon Sep 24 21:28:21 CEST 2007
150	root	1.129	- after fork, invest some work to make sure that the poll_fileno
151			stays stable (by dup2'ing the new fd over the old one), to make
152			it easier for programs/libs that don't control their forking
153			behaviour and cannot recreate their watchers.
154
155	root	1.128	2.4 Sun Aug 5 18:44:22 CEST 2007
156	root	1.127	- add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
157			successfully demonstrated that you can block on futimes...).
158	root	1.124	- allow undef as fileoffset for aio_read/write and use read/write(2)
159			internally (useful for sockets or O_APPEND handles).
160	root	1.126	- allow undef for length in aio_write.
161			- negative dataoffsets work as expected now in aio_read/aio_write.
162	root	1.124	- use NV instead of UV for 32 bit perls and file offsets, as NVs
163	root	1.125	have a larger range then.
164	root	1.120	- shared code between BDB and IO::AIO.
165	root	1.127	- aio_busy was completely broken. now fixed.
166			- readahead emulation now returns something.
167	root	1.121	- correctly set errno to ENOSYS on unimplemented functions
168			(should never happen, though).
169	root	1.127	- large changes to make it partially compile and run on win32,
170			but win32 lacks too much functionality, and perl overrides way
171			too many functions with crashing versions.
172	root	1.120
173	root	1.119	2.33 Tue Jan 23 23:55:41 CET 2007
174			- fix install path (Andreas J. Koenig).
175
176	root	1.118	2.32 Mon Jan 22 16:56:23 CET 2007
177	root	1.114	- added aio_rmtree.
178	root	1.115	- wow, aio_mkdir was missing.
179	root	1.116	- aio_load did return undef on error, not -1.
180	root	1.117	- use prefixexp not prefix in autoconf.pm
181			(suggested by ... rt.cpan.org unreachable).
182	root	1.118	- avoid installing autoconf.pm.
183	root	1.114
184	root	1.113	2.31 Sat Jan 6 03:46:02 CET 2007
185	root	1.112	- added aio_load.
186
187	root	1.111	2.3 Sat Dec 23 05:48:07 CET 2006
188			- fix off-by-one bug in aio_read, causing memory corruption
189			or crashes.
190
191	root	1.110	2.21 Fri Dec 22 05:03:38 CET 2006
192	root	1.108	- minor doc updates.
193	root	1.107	- minor cleanups.
194			- IO::AIO::poll returns request count.
195	root	1.109	- undocumented and unfinished async-signal-reporting.
196	root	1.107
197	root	1.103	2.2 Tue Oct 31 00:31:00 CET 2006
198	root	1.100	- minor doc updates.
199	root	1.101	- added aio_readlink.
200			- properly zero-terminate aio_read buffer.
201			- fix aio_read/write with nonzero dataoffset.
202	root	1.104	- reduced size of aio request structure.
203	root	1.106	- better diagnostics when pathnames etc. are not byte-encoded;
204	root	1.105	do not leak request in that case, either.
205	root	1.94
206	root	1.99	2.1 Sun Oct 29 02:01:57 CET 2006
207	root	1.98	- INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
208			IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
209	root	1.95	- fix a bug in aio_move where it would fail everytime
210			it would have to copy files manually.
211	root	1.98	- doc updates.
212	root	1.94	- start threads only on (very low) demand.
213	root	1.97	- end superfluous threads automatically after 10s idling.
214	root	1.98	- add IO::AIO::max_idle to control this.
215	root	1.94	- some tuning applied to random places.
216	root	1.95	- add aio_mknod.
217	root	1.59
218	root	1.92	2.0 Thu Oct 26 18:27:58 CEST 2006
219	root	1.90	- minor incompatibility: max_outstanding semantics have changed.
220	root	1.86	- major rewrite, consider all functionality EXPERIMENTAL.
221	root	1.68	- aio requests can be cancelled.
222	root	1.81	- callbacks can be (re-)set later.
223	root	1.93	- aio requests can choose between 9 priorities.
224	root	1.83	- add aio_group: aio requests can be grouped
225			into composite requests.
226			- generator interface for groups.
227	root	1.89	- add IO::AIO::poll_some.
228	root	1.72	- major documentation improvements.
229			- very minor bugfixes.
230	root	1.76	- add aio_nop for dummy requests.
231	root	1.84	- add aio_busy mainly for benchmarking and debugging.
232	root	1.79	- use "fast" mutexes on linux.
233	root	1.80	- use dynamic (and larger) buffers instead of
234			putting them onto the stack.
235			- optimise x86 and amd64 a bit.
236			- better error checking when ENOMEM.
237	root	1.85	- hopefully fix mem and dirp leaks on fork.
238	root	1.92	- warn about broken perl malloc.
239	root	1.88	- compiles on cygwin (but pread is broken on cygwin
240			which is not detected by autoconf, so you have to
241			edit autoconf/config.h yourself to enable emulation).
242	root	1.68
243	root	1.67	1.8 Sat Jun 24 22:20:44 CEST 2006
244	root	1.66	- add and/or document aio_rename, aio_link, aio_symlink and aio_move.
245
246	root	1.65	1.73 Wed Mar 1 22:49:32 CET 2006
247			- codename "jost"
248			- AIX/Solaris(?) aren't being helpful again, hardcode a value
249			for NAME_MAX and drive with your eyes closed (reported by
250			wcooley@nakedape.cc).
251	root	1.63
252	root	1.62	1.72 Thu Feb 2 00:40:44 CET 2006
253	root	1.61	- another minor bug in aio_scandir, again, the callback was called
254			twice when the directory can't be stat'ed.
255
256	root	1.60	1.71 Mon Dec 26 20:20:03 CET 2005
257			- grr, another minor bug in aio_scandir, this time resulting
258			in a runtime error.
259
260	root	1.59	1.7 Mon Dec 26 19:29:48 CET 2005
261	root	1.58	- aio_scandir errornously called callback twice in some cases.
262	root	1.57	- added AnyEvent example.
263
264	root	1.55	1.61 Wed Sep 7 19:40:42 CEST 2005
265	root	1.54	- no longer include $Config{libs}, as distros include too much
266	root	1.56	garbage in there that is not installed on typical systems
267	root	1.54	(for example, debian links perl against -lgdbm and many more
268			libraries despite perl not needing it, slowing down startup and
269			wasting memory).
270
271	root	1.53	1.6 Tue Aug 30 17:44:44 CEST 2005
272			- added aio_readdir, aio_scandir.
273	root	1.51	- added aio_sendfile, including sendfile emulation when sendfile
274			isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
275			support is unavailable on my solaris 8 machine, but preliminary
276			code is there. What's lacking is configury stuff and testing...).
277	root	1.46
278	root	1.44	1.5 Sat Aug 20 02:32:19 CEST 2005
279	root	1.51	- create the aio threads on demand only (good after forking).
280	root	1.41	- somebody nagged about C89 compatibility, so this release should
281	root	1.42	be C89 compatible, but no guarantees for future ones.
282	root	1.43	- abort when the configure script fails.
283	root	1.41
284	root	1.40	1.4 Wed Aug 17 08:07:27 CEST 2005
285	root	1.93	- forgot to recreate the pipe after forking, this could cause
286	root	1.40	deadlocks.
287
288	root	1.39	1.3 Wed Aug 17 07:25:54 CEST 2005
289	root	1.33	- properly propagate exceptions from callbacks, instead of silently
290			eating them.
291	root	1.38	- use a different fork algorithm that avoids recursive callback
292			invocations and reduces fork latency in busy processes.
293	root	1.37	- fix a bug where the buffer scalar in aio_read got assigned the wrong
294			length after reading.
295			- fix a bug where the child would process some outstanding requests
296			from the parent.
297			- make a copy of the callback scalar, to avoid some very uncommon
298			(but valid) usages where the callback scalar changes.
299			- the callback was never freed in aio_read/aio_write.
300	root	1.38	- aio_read/aio_write will now set the readonly flag on the data
301			scalar for better error reporting.
302	root	1.33
303	root	1.32	1.2 Wed Aug 17 01:22:58 CEST 2005
304			- verified on cygwin, linux/amd64+ia32+alpha, solaris.
305	root	1.31	- use SvPVbyte for filenames now. You need to encode your strings to
306			the external filename encoding first.
307	root	1.32	- fix the bug where filehandles could leak (again).
308	root	1.31	- clarify freebsd situation: make it work and tell me how, or go away
309			with your underdocumented, broken and outdated OS.
310			- fork'ing should now be officially supported (where linux and
311			posix contradict each other, I followed posix).
312	root	1.32	- only call read() once per poll, not twice (speedup).
313			- new functions: aio_rmdir, aio_symlink.
314	root	1.31	- force callback arguments to be undef or a reference, for better
315			error catching.
316	root	1.1
317	root	1.29	1.1 Sun Aug 7 05:27:23 CEST 2005
318	root	1.25	- added configure script to detect availability of some calls.
319	root	1.27	(imperfect, as we cannot detect things like -lrt due to missing
320	root	1.23	feedback yet).
321	root	1.27	- emulate fdatasync via fsync, pread/pwrite via unsafe read/write
322			and readahead via manual reading on platforms lacking those.
323	root	1.19	- ported t/03_errors.t+framework by Brad Fitzpatrick
324			from Linux::AIO.
325	root	1.18	- removed XOPEN_SOURCE because stupid solaris 9 doesn't
326			compile with it enabled. Probably breaks others. Oh well.
327	root	1.24	- try to be more careful with errno on non-threaded perls.
328	root	1.26	- cygwins perl insisted on a matching open mode when morphing
329			the fd to an fh.
330	root	1.28	- convert sv's to "byte" encoding in aio_read/aio_write. Might
331			do that for pathnames, too, in the future, so make sure you
332			properly encode your pathnames.
333	root	1.18
334	root	1.17	1.0 Fri Jul 22 10:43:30 CEST 2005
335			- aio_open did not reliably deliver (open) filehandles.
336	root	1.16	- all aio_*-functions keep a reference to the filehandle so
337			it doesn't go away while the aio requests is working on it.
338			- disable warnings in AIO.pm.
339
340	root	1.15	0.9 Wed Jul 20 23:55:04 CEST 2005
341			- allow recursive calls to poll_cb, use less locking calls, too.
342			- fix the Gtk2-example in the SYNOPSIS.
343	root	1.14	- use pread/pwrite not pread64/pwrite64. this was simply a leftover
344			from Linux::AIO.
345			(found by compiling on cygwin. Unfortunately, cygwin declares but
346			does not implement pread/pwrite).
347			- only include <sys/syscall.h> on linux.
348
349	root	1.13	0.5 Tue Jul 12 13:03:09 CEST 2005
350	root	1.12	- removed #include <endian.h>, it's not portable, and we don't
351			need it anyway.
352			- link against -lrt, as it might contain goodies such as fdatasync,
353			and often aio_read, which we do not use yet, but it shouldn't hurt.
354
355	root	1.11	0.4 Mon Jul 11 05:28:25 CEST 2005
356	root	1.9	- added IO::AIO::flush, IO::AIO::poll.
357	root	1.10	- make callback argument optional for all calls.
358	root	1.8
359	root	1.7	0.3 Mon Jul 11 01:42:37 CEST 2005
360	root	1.5	- restructured manpage.
361	root	1.7	- added SYNOPSIS with examples for Event, Glib, Tk.
362			- remove explicit context support so I don't have to maintain
363			it for threaded perls (i.e. it should work now :).
364	root	1.5
365	root	1.4	0.2 Sun Jul 10 22:57:12 CEST 2005
366	root	1.2	- return immediately from poll_wait if nreqs==0.
367			- get rid of the request pipe and use faster thread-thread
368	root	1.3	communications for most requests and responses.
369	root	1.2
370	root	1.1	0.1
371			- cloned from Linux::AIO, which is very similar.
372