[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
TODO: fallocate, if it wouldn't be so useless.

        - use common::sense.
        - use common schmorp.h header.
        - allow integers (file descriptors) in addition to file handles.

3.261 Wed Jul  1 10:11:51 CEST 2009
        - more OS X workarounds (patch by Tokuhiro Matsuno).

3.26 Tue Jun 30 09:33:26 CEST 2009
        - os x of course claims posix 2008 but lacks posix_fadvise. try to work
          around this horribly broken OS in a somewhat hackish way. might help
          other os's too.

3.25 Sat Jun 27 05:18:26 CEST 2009
        - added IO::AIO::fadvise and IO::AIO::sendfile.
        - (libeio) replaced quicksort+insertion sort by a tuned radix
          sort + insertion sort, resulting in comparable runtime (usually
          faster) to the old version, but without any ill side effects on
          degenerated (for quicksort) data.
        - (libeio) correctly sort dirs by inodes if we have perfect type
          knowledge and DIRS_FIRST is used.
        - (libeio) internally the wrong DT_* constants were used, but no
          known system has differing EIO_DT_*/DT_* values, so not an issue.
        - removed a (harmless) assert that was left over on the code
          but should not have been.
        - use more correct types (change IO length from IV to VAL64,
          which makes a difference on systems without 64 bit perls).

3.23 Sat Jun 13 16:57:58 CEST 2009
        - fix off-by-one bug in aio_readdir that was introduced in the
          rushed 3.22 release.

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:	1.202
Committed:	Tue Jul 14 00:13:36 2009 UTC (14 years, 10 months ago) by root
Branch:	MAIN
Changes since 1.201:	+4 -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	1.176	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	1.196	TODO: fallocate, if it wouldn't be so useless.
9	root	1.100
10	root	1.202	- use common::sense.
11			- use common schmorp.h header.
12			- allow integers (file descriptors) in addition to file handles.
13
14	root	1.201	3.261 Wed Jul 1 10:11:51 CEST 2009
15	root	1.200	- more OS X workarounds (patch by Tokuhiro Matsuno).
16
17	root	1.199	3.26 Tue Jun 30 09:33:26 CEST 2009
18			- os x of course claims posix 2008 but lacks posix_fadvise. try to work
19			around this horribly broken OS in a somewhat hackish way. might help
20			other os's too.
21
22	root	1.198	3.25 Sat Jun 27 05:18:26 CEST 2009
23	root	1.197	- added IO::AIO::fadvise and IO::AIO::sendfile.
24	root	1.195	- (libeio) replaced quicksort+insertion sort by a tuned radix
25			sort + insertion sort, resulting in comparable runtime (usually
26			faster) to the old version, but without any ill side effects on
27			degenerated (for quicksort) data.
28			- (libeio) correctly sort dirs by inodes if we have perfect type
29	root	1.194	knowledge and DIRS_FIRST is used.
30	root	1.195	- (libeio) internally the wrong DT_* constants were used, but no
31			known system has differing EIO_DT_/DT_ values, so not an issue.
32			- removed a (harmless) assert that was left over on the code
33			but should not have been.
34	root	1.196	- use more correct types (change IO length from IV to VAL64,
35			which makes a difference on systems without 64 bit perls).
36	root	1.194
37	root	1.193	3.23 Sat Jun 13 16:57:58 CEST 2009
38			- fix off-by-one bug in aio_readdir that was introduced in the
39			rushed 3.22 release.
40
41	root	1.192	3.22 Sat Jun 13 15:32:40 CEST 2009
42	root	1.191	- speed up readdirx sort algorithm slightly.
43	root	1.192	- bin/treescan was missing from distro tarball.
44	root	1.191
45	root	1.190	3.21 Fri Jun 12 18:45:53 CEST 2009
46	root	1.187	- new options --dirs and --files for treescan.
47	root	1.188	- install bin/treescan by default.
48	root	1.189	- (libeio) aio_readdir can now be cancelled while executing.
49	root	1.190	- fix a printf format string for 64 bit systems (could lead
50			to problems on big endian 64 bit systems).
51			- do not use qsort() but our own algorithm: glibc initialises
52			the whole locale and I/O subsystem inside qsort, causing
53			a stack overflow on 32 bit machines. The new sort uses much less
54			stack and is more than twice as fast in typical situations.
55	root	1.187
56	root	1.186	3.2 Sun Jun 7 20:30:05 CEST 2009
57	root	1.182	- (libeio) pwrite emulation was even more flawed than intended and did
58			not restore the file offset.
59	root	1.183	- add aio_readdirx, which can return inode and filetype and sort
60			the names in various ways.
61	root	1.182	- unfortunately, utime, chmod, chown on an open file that has just
62			been written can easily block, which caused aio_copy to block the
63			process. no more!
64			- no longer rely on dst path in aio_copy when futime is available.
65
66	root	1.181	3.19 Tue Apr 21 22:05:21 CEST 2009
67			- more perl 5.10 workarounds for aio_read and write.
68			- aio_write no longer modifies the sv (if possible).
69			- aio_read now works correctly with magic values.
70
71	root	1.180	3.18 Sun Apr 19 21:17:32 CEST 2009
72	root	1.179	- better diagnostics when some aio_* functions get passed an illegal fh.
73	root	1.180	- try to avoid crashes due to incompatible 5.10 API changes. grmbl.
74	root	1.178
75	root	1.177	3.17 Thu Nov 20 08:45:36 CET 2008
76	root	1.176	- (libeio) added aio_sync_file_range (untested).
77	root	1.177	- add aio_busy to @IO::AIO::AIO_REQ.
78	root	1.175
79	root	1.174	3.16 Wed Oct 22 18:28:01 CEST 2008
80	root	1.173	- use SvREFCNT_inc instead of SvREFCNT_inc_NN in a non-speed critical
81			part to improve portability to perl 5.8 (reported by szymon).
82
83	root	1.172	3.15 Mon Oct 13 00:39:55 CEST 2008
84	root	1.171	- automatic removal of feeders was broken.
85			- (libeio) use a more robust method to detect whether a feeder
86			has added something to the group or not.
87
88	root	1.170	3.1 Thu Oct 2 13:34:40 CEST 2008
89	root	1.168	- pre-deref the passed callback object, for increased speed
90			and decreased memory usage.
91	root	1.167	- call on_next_submit callback even for aio_group - impact unknown,
92	root	1.166	but seems more correct.
93	root	1.168	- $req->cb now returns the original callback.
94	root	1.166	- (libeio) pass EIO_GROUP/aio_group requests through the queue without
95			requiring a thread switch.
96	root	1.169	- (libeio) status code of aio_futime and aio_utime was always passed 0.
97	root	1.166	- do some other µ-optimisations.
98
99	root	1.165	3.07 Sat Aug 2 16:06:13 CEST 2008
100			- do not include LIBS in autoconf tests.
101
102	root	1.164	3.06 Tue Jul 15 12:41:32 CEST 2008
103	root	1.162	- move preadwritelock definition before it's first reference,
104	root	1.164	to make it compile again on broken platforms (they still exist)
105			or badly cofngiured perls (redhat...), reported by Rob Bloodgood.
106	root	1.162
107	root	1.161	3.05 Thu Jun 19 23:23:52 CEST 2008
108	root	1.160	- work around perl overriding readdir etc. with thread-unsafe
109	root	1.161	(sic!) versions.
110	root	1.160
111	root	1.159	3.04 Wed Jun 18 01:35:38 CEST 2008
112			- (libeio) fix eio_mknod, which confused it's arguments.
113	root	1.158	- (libeio) do not use readdir_r, as Ulrich Drepper pointed out that this
114			is stupid.
115	root	1.159	- (libeio) fix eio__readahead prototype, patch by Jost Krieger.
116			- (libeio) fix a bug that could potentially cause IO::AIO
117			not to get initialised properly.
118	root	1.158
119	root	1.157	3.03 Thu May 29 05:33:30 CEST 2008
120	root	1.153	- (libeio) correctly call pthread_attr_destroy ().
121	root	1.155	- (libeio) work around broken bsd headers once more.
122	root	1.154	- reduce shared library size again by not including wrappers.
123	root	1.156	- max_outstanding could cause poll to enter a busy-waiting loop.
124			- document the new IO::AIO::poll_cb result value.
125	root	1.153
126	root	1.152	3.02 Mon May 12 02:32:02 CEST 2008
127	root	1.150	- fix a memory leak on aio_readlink.
128			- bring back working fchmod.
129	root	1.151	- nop and busy now set result to 0.
130			- set errno to ENOMEM when allocation fails.
131	root	1.150
132	root	1.149	3.01 Sun May 11 03:07:03 CEST 2008
133			- (libeio) make it compile on systems without readahead or readdir_r.
134	root	1.148	- (libeio) improve configure check for readahead availability.
135			- do not try to link against -lrt.
136	root	1.147	- use a separate configure script for IO::AIO (not the libeio one).
137
138	root	1.146	3.0 Sun May 11 00:57:14 CEST 2008
139	root	1.145	- added bin/treescan to the distribution.
140			- switched to using libeio.
141			- LOTS OF INCOMPATIBLE CHANGES:
142			- remove signal functionality, it is not worth the effort.
143			- max_outstanding no longer returns the previous number of requests.
144			- poll_cb no longer returns number of requests.
145	root	1.143
146	root	1.142	2.62 Sat Apr 26 13:59:33 CEST 2008
147	root	1.141	- port to solaris perls configured for old posix
148			(analysed by Jost Krieger).
149	root	1.142	- keep a reference to the perl filehandle object in aio_close,
150			so it doesn't get closed prematurely, leading to ugly races.
151	root	1.141
152	root	1.140	2.61 Wed Apr 16 18:45:02 CEST 2008
153	root	1.137	- fix treescan output duplication and improve output ordering.
154			also display files given on the commandline.
155	root	1.140	- use a different algorithm for aio_close that is faster
156			and probably has even lower chances of blocking.
157	root	1.138	- do our own stack memory management for threads - linux
158			allocates outrageous amounts of VM (not so bad unless you
159			use mlockall...), which severely limits the number of threads
160	root	1.139	on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
161			and 4096 * sizeof (long) (usually this is 16..64k).
162	root	1.137
163	root	1.136	2.6 Sun Mar 30 08:28:11 CEST 2008
164	root	1.134	- added aio_sync.
165	root	1.135	- added aio_pathsync.
166	root	1.136	- fix prototypes of (void) functions.
167	root	1.134
168	root	1.133	2.51 Sat Oct 6 16:04:54 CEST 2007
169			- perlio isn't generally threadsafe, so aio_close could not work reliably.
170			aio_close now tries a safe hack that might not be that asynchronous
171			(see the manpage for details).
172			- discard callback return values as to not grow the stack endlessly
173			when poll_cb handles many requests without returning.
174			- minor code cleanups.
175
176	root	1.132	2.5 Thu Oct 4 14:49:08 CEST 2007
177	root	1.131	- replaced _fd2fh with faster xs code.
178			- aio_close will now try to do "the right thing" and thus might
179			work sensibly for the very first time.
180
181	root	1.130	2.41 Mon Sep 24 21:28:21 CEST 2007
182	root	1.129	- after fork, invest some work to make sure that the poll_fileno
183			stays stable (by dup2'ing the new fd over the old one), to make
184			it easier for programs/libs that don't control their forking
185			behaviour and cannot recreate their watchers.
186
187	root	1.128	2.4 Sun Aug 5 18:44:22 CEST 2007
188	root	1.127	- add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
189			successfully demonstrated that you can block on futimes...).
190	root	1.124	- allow undef as fileoffset for aio_read/write and use read/write(2)
191			internally (useful for sockets or O_APPEND handles).
192	root	1.126	- allow undef for length in aio_write.
193			- negative dataoffsets work as expected now in aio_read/aio_write.
194	root	1.124	- use NV instead of UV for 32 bit perls and file offsets, as NVs
195	root	1.125	have a larger range then.
196	root	1.120	- shared code between BDB and IO::AIO.
197	root	1.127	- aio_busy was completely broken. now fixed.
198			- readahead emulation now returns something.
199	root	1.121	- correctly set errno to ENOSYS on unimplemented functions
200			(should never happen, though).
201	root	1.127	- large changes to make it partially compile and run on win32,
202			but win32 lacks too much functionality, and perl overrides way
203			too many functions with crashing versions.
204	root	1.120
205	root	1.119	2.33 Tue Jan 23 23:55:41 CET 2007
206			- fix install path (Andreas J. Koenig).
207
208	root	1.118	2.32 Mon Jan 22 16:56:23 CET 2007
209	root	1.114	- added aio_rmtree.
210	root	1.115	- wow, aio_mkdir was missing.
211	root	1.116	- aio_load did return undef on error, not -1.
212	root	1.117	- use prefixexp not prefix in autoconf.pm
213			(suggested by ... rt.cpan.org unreachable).
214	root	1.118	- avoid installing autoconf.pm.
215	root	1.114
216	root	1.113	2.31 Sat Jan 6 03:46:02 CET 2007
217	root	1.112	- added aio_load.
218
219	root	1.111	2.3 Sat Dec 23 05:48:07 CET 2006
220			- fix off-by-one bug in aio_read, causing memory corruption
221			or crashes.
222
223	root	1.110	2.21 Fri Dec 22 05:03:38 CET 2006
224	root	1.108	- minor doc updates.
225	root	1.107	- minor cleanups.
226			- IO::AIO::poll returns request count.
227	root	1.109	- undocumented and unfinished async-signal-reporting.
228	root	1.107
229	root	1.103	2.2 Tue Oct 31 00:31:00 CET 2006
230	root	1.100	- minor doc updates.
231	root	1.101	- added aio_readlink.
232			- properly zero-terminate aio_read buffer.
233			- fix aio_read/write with nonzero dataoffset.
234	root	1.104	- reduced size of aio request structure.
235	root	1.106	- better diagnostics when pathnames etc. are not byte-encoded;
236	root	1.105	do not leak request in that case, either.
237	root	1.94
238	root	1.99	2.1 Sun Oct 29 02:01:57 CET 2006
239	root	1.98	- INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
240			IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
241	root	1.95	- fix a bug in aio_move where it would fail everytime
242			it would have to copy files manually.
243	root	1.98	- doc updates.
244	root	1.94	- start threads only on (very low) demand.
245	root	1.97	- end superfluous threads automatically after 10s idling.
246	root	1.98	- add IO::AIO::max_idle to control this.
247	root	1.94	- some tuning applied to random places.
248	root	1.95	- add aio_mknod.
249	root	1.59
250	root	1.92	2.0 Thu Oct 26 18:27:58 CEST 2006
251	root	1.90	- minor incompatibility: max_outstanding semantics have changed.
252	root	1.86	- major rewrite, consider all functionality EXPERIMENTAL.
253	root	1.68	- aio requests can be cancelled.
254	root	1.81	- callbacks can be (re-)set later.
255	root	1.93	- aio requests can choose between 9 priorities.
256	root	1.83	- add aio_group: aio requests can be grouped
257			into composite requests.
258			- generator interface for groups.
259	root	1.89	- add IO::AIO::poll_some.
260	root	1.72	- major documentation improvements.
261			- very minor bugfixes.
262	root	1.76	- add aio_nop for dummy requests.
263	root	1.84	- add aio_busy mainly for benchmarking and debugging.
264	root	1.79	- use "fast" mutexes on linux.
265	root	1.80	- use dynamic (and larger) buffers instead of
266			putting them onto the stack.
267			- optimise x86 and amd64 a bit.
268			- better error checking when ENOMEM.
269	root	1.85	- hopefully fix mem and dirp leaks on fork.
270	root	1.92	- warn about broken perl malloc.
271	root	1.88	- compiles on cygwin (but pread is broken on cygwin
272			which is not detected by autoconf, so you have to
273			edit autoconf/config.h yourself to enable emulation).
274	root	1.68
275	root	1.67	1.8 Sat Jun 24 22:20:44 CEST 2006
276	root	1.66	- add and/or document aio_rename, aio_link, aio_symlink and aio_move.
277
278	root	1.65	1.73 Wed Mar 1 22:49:32 CET 2006
279			- codename "jost"
280			- AIX/Solaris(?) aren't being helpful again, hardcode a value
281			for NAME_MAX and drive with your eyes closed (reported by
282			wcooley@nakedape.cc).
283	root	1.63
284	root	1.62	1.72 Thu Feb 2 00:40:44 CET 2006
285	root	1.61	- another minor bug in aio_scandir, again, the callback was called
286			twice when the directory can't be stat'ed.
287
288	root	1.60	1.71 Mon Dec 26 20:20:03 CET 2005
289			- grr, another minor bug in aio_scandir, this time resulting
290			in a runtime error.
291
292	root	1.59	1.7 Mon Dec 26 19:29:48 CET 2005
293	root	1.58	- aio_scandir errornously called callback twice in some cases.
294	root	1.57	- added AnyEvent example.
295
296	root	1.55	1.61 Wed Sep 7 19:40:42 CEST 2005
297	root	1.54	- no longer include $Config{libs}, as distros include too much
298	root	1.56	garbage in there that is not installed on typical systems
299	root	1.54	(for example, debian links perl against -lgdbm and many more
300			libraries despite perl not needing it, slowing down startup and
301			wasting memory).
302
303	root	1.53	1.6 Tue Aug 30 17:44:44 CEST 2005
304			- added aio_readdir, aio_scandir.
305	root	1.51	- added aio_sendfile, including sendfile emulation when sendfile
306			isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
307			support is unavailable on my solaris 8 machine, but preliminary
308			code is there. What's lacking is configury stuff and testing...).
309	root	1.46
310	root	1.44	1.5 Sat Aug 20 02:32:19 CEST 2005
311	root	1.51	- create the aio threads on demand only (good after forking).
312	root	1.41	- somebody nagged about C89 compatibility, so this release should
313	root	1.42	be C89 compatible, but no guarantees for future ones.
314	root	1.43	- abort when the configure script fails.
315	root	1.41
316	root	1.40	1.4 Wed Aug 17 08:07:27 CEST 2005
317	root	1.93	- forgot to recreate the pipe after forking, this could cause
318	root	1.40	deadlocks.
319
320	root	1.39	1.3 Wed Aug 17 07:25:54 CEST 2005
321	root	1.33	- properly propagate exceptions from callbacks, instead of silently
322			eating them.
323	root	1.38	- use a different fork algorithm that avoids recursive callback
324			invocations and reduces fork latency in busy processes.
325	root	1.37	- fix a bug where the buffer scalar in aio_read got assigned the wrong
326			length after reading.
327			- fix a bug where the child would process some outstanding requests
328			from the parent.
329			- make a copy of the callback scalar, to avoid some very uncommon
330			(but valid) usages where the callback scalar changes.
331			- the callback was never freed in aio_read/aio_write.
332	root	1.38	- aio_read/aio_write will now set the readonly flag on the data
333			scalar for better error reporting.
334	root	1.33
335	root	1.32	1.2 Wed Aug 17 01:22:58 CEST 2005
336			- verified on cygwin, linux/amd64+ia32+alpha, solaris.
337	root	1.31	- use SvPVbyte for filenames now. You need to encode your strings to
338			the external filename encoding first.
339	root	1.32	- fix the bug where filehandles could leak (again).
340	root	1.31	- clarify freebsd situation: make it work and tell me how, or go away
341			with your underdocumented, broken and outdated OS.
342			- fork'ing should now be officially supported (where linux and
343			posix contradict each other, I followed posix).
344	root	1.32	- only call read() once per poll, not twice (speedup).
345			- new functions: aio_rmdir, aio_symlink.
346	root	1.31	- force callback arguments to be undef or a reference, for better
347			error catching.
348	root	1.1
349	root	1.29	1.1 Sun Aug 7 05:27:23 CEST 2005
350	root	1.25	- added configure script to detect availability of some calls.
351	root	1.27	(imperfect, as we cannot detect things like -lrt due to missing
352	root	1.23	feedback yet).
353	root	1.27	- emulate fdatasync via fsync, pread/pwrite via unsafe read/write
354			and readahead via manual reading on platforms lacking those.
355	root	1.19	- ported t/03_errors.t+framework by Brad Fitzpatrick
356			from Linux::AIO.
357	root	1.18	- removed XOPEN_SOURCE because stupid solaris 9 doesn't
358			compile with it enabled. Probably breaks others. Oh well.
359	root	1.24	- try to be more careful with errno on non-threaded perls.
360	root	1.26	- cygwins perl insisted on a matching open mode when morphing
361			the fd to an fh.
362	root	1.28	- convert sv's to "byte" encoding in aio_read/aio_write. Might
363			do that for pathnames, too, in the future, so make sure you
364			properly encode your pathnames.
365	root	1.18
366	root	1.17	1.0 Fri Jul 22 10:43:30 CEST 2005
367			- aio_open did not reliably deliver (open) filehandles.
368	root	1.16	- all aio_*-functions keep a reference to the filehandle so
369			it doesn't go away while the aio requests is working on it.
370			- disable warnings in AIO.pm.
371
372	root	1.15	0.9 Wed Jul 20 23:55:04 CEST 2005
373			- allow recursive calls to poll_cb, use less locking calls, too.
374			- fix the Gtk2-example in the SYNOPSIS.
375	root	1.14	- use pread/pwrite not pread64/pwrite64. this was simply a leftover
376			from Linux::AIO.
377			(found by compiling on cygwin. Unfortunately, cygwin declares but
378			does not implement pread/pwrite).
379			- only include <sys/syscall.h> on linux.
380
381	root	1.13	0.5 Tue Jul 12 13:03:09 CEST 2005
382	root	1.12	- removed #include <endian.h>, it's not portable, and we don't
383			need it anyway.
384			- link against -lrt, as it might contain goodies such as fdatasync,
385			and often aio_read, which we do not use yet, but it shouldn't hurt.
386
387	root	1.11	0.4 Mon Jul 11 05:28:25 CEST 2005
388	root	1.9	- added IO::AIO::flush, IO::AIO::poll.
389	root	1.10	- make callback argument optional for all calls.
390	root	1.8
391	root	1.7	0.3 Mon Jul 11 01:42:37 CEST 2005
392	root	1.5	- restructured manpage.
393	root	1.7	- added SYNOPSIS with examples for Event, Glib, Tk.
394			- remove explicit context support so I don't have to maintain
395			it for threaded perls (i.e. it should work now :).
396	root	1.5
397	root	1.4	0.2 Sun Jul 10 22:57:12 CEST 2005
398	root	1.2	- return immediately from poll_wait if nreqs==0.
399			- get rid of the request pipe and use faster thread-thread
400	root	1.3	communications for most requests and responses.
401	root	1.2
402	root	1.1	0.1
403			- cloned from Linux::AIO, which is very similar.
404