[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.
        - take advantage of linux' eventfd (but it seems slower on smp?).
        - use poll not select on posix platforms.

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:	1.204
Committed:	Wed Aug 5 11:47:56 2009 UTC (14 years, 10 months ago) by root
Branch:	MAIN
Changes since 1.203:	+1 -1 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	root	1.203	- take advantage of linux' eventfd (but it seems slower on smp?).
14	root	1.204	- use poll not select on posix platforms.
15	root	1.202
16	root	1.201	3.261 Wed Jul 1 10:11:51 CEST 2009
17	root	1.200	- more OS X workarounds (patch by Tokuhiro Matsuno).
18
19	root	1.199	3.26 Tue Jun 30 09:33:26 CEST 2009
20			- os x of course claims posix 2008 but lacks posix_fadvise. try to work
21			around this horribly broken OS in a somewhat hackish way. might help
22			other os's too.
23
24	root	1.198	3.25 Sat Jun 27 05:18:26 CEST 2009
25	root	1.197	- added IO::AIO::fadvise and IO::AIO::sendfile.
26	root	1.195	- (libeio) replaced quicksort+insertion sort by a tuned radix
27			sort + insertion sort, resulting in comparable runtime (usually
28			faster) to the old version, but without any ill side effects on
29			degenerated (for quicksort) data.
30			- (libeio) correctly sort dirs by inodes if we have perfect type
31	root	1.194	knowledge and DIRS_FIRST is used.
32	root	1.195	- (libeio) internally the wrong DT_* constants were used, but no
33			known system has differing EIO_DT_/DT_ values, so not an issue.
34			- removed a (harmless) assert that was left over on the code
35			but should not have been.
36	root	1.196	- use more correct types (change IO length from IV to VAL64,
37			which makes a difference on systems without 64 bit perls).
38	root	1.194
39	root	1.193	3.23 Sat Jun 13 16:57:58 CEST 2009
40			- fix off-by-one bug in aio_readdir that was introduced in the
41			rushed 3.22 release.
42
43	root	1.192	3.22 Sat Jun 13 15:32:40 CEST 2009
44	root	1.191	- speed up readdirx sort algorithm slightly.
45	root	1.192	- bin/treescan was missing from distro tarball.
46	root	1.191
47	root	1.190	3.21 Fri Jun 12 18:45:53 CEST 2009
48	root	1.187	- new options --dirs and --files for treescan.
49	root	1.188	- install bin/treescan by default.
50	root	1.189	- (libeio) aio_readdir can now be cancelled while executing.
51	root	1.190	- fix a printf format string for 64 bit systems (could lead
52			to problems on big endian 64 bit systems).
53			- do not use qsort() but our own algorithm: glibc initialises
54			the whole locale and I/O subsystem inside qsort, causing
55			a stack overflow on 32 bit machines. The new sort uses much less
56			stack and is more than twice as fast in typical situations.
57	root	1.187
58	root	1.186	3.2 Sun Jun 7 20:30:05 CEST 2009
59	root	1.182	- (libeio) pwrite emulation was even more flawed than intended and did
60			not restore the file offset.
61	root	1.183	- add aio_readdirx, which can return inode and filetype and sort
62			the names in various ways.
63	root	1.182	- unfortunately, utime, chmod, chown on an open file that has just
64			been written can easily block, which caused aio_copy to block the
65			process. no more!
66			- no longer rely on dst path in aio_copy when futime is available.
67
68	root	1.181	3.19 Tue Apr 21 22:05:21 CEST 2009
69			- more perl 5.10 workarounds for aio_read and write.
70			- aio_write no longer modifies the sv (if possible).
71			- aio_read now works correctly with magic values.
72
73	root	1.180	3.18 Sun Apr 19 21:17:32 CEST 2009
74	root	1.179	- better diagnostics when some aio_* functions get passed an illegal fh.
75	root	1.180	- try to avoid crashes due to incompatible 5.10 API changes. grmbl.
76	root	1.178
77	root	1.177	3.17 Thu Nov 20 08:45:36 CET 2008
78	root	1.176	- (libeio) added aio_sync_file_range (untested).
79	root	1.177	- add aio_busy to @IO::AIO::AIO_REQ.
80	root	1.175
81	root	1.174	3.16 Wed Oct 22 18:28:01 CEST 2008
82	root	1.173	- use SvREFCNT_inc instead of SvREFCNT_inc_NN in a non-speed critical
83			part to improve portability to perl 5.8 (reported by szymon).
84
85	root	1.172	3.15 Mon Oct 13 00:39:55 CEST 2008
86	root	1.171	- automatic removal of feeders was broken.
87			- (libeio) use a more robust method to detect whether a feeder
88			has added something to the group or not.
89
90	root	1.170	3.1 Thu Oct 2 13:34:40 CEST 2008
91	root	1.168	- pre-deref the passed callback object, for increased speed
92			and decreased memory usage.
93	root	1.167	- call on_next_submit callback even for aio_group - impact unknown,
94	root	1.166	but seems more correct.
95	root	1.168	- $req->cb now returns the original callback.
96	root	1.166	- (libeio) pass EIO_GROUP/aio_group requests through the queue without
97			requiring a thread switch.
98	root	1.169	- (libeio) status code of aio_futime and aio_utime was always passed 0.
99	root	1.166	- do some other µ-optimisations.
100
101	root	1.165	3.07 Sat Aug 2 16:06:13 CEST 2008
102			- do not include LIBS in autoconf tests.
103
104	root	1.164	3.06 Tue Jul 15 12:41:32 CEST 2008
105	root	1.162	- move preadwritelock definition before it's first reference,
106	root	1.164	to make it compile again on broken platforms (they still exist)
107			or badly cofngiured perls (redhat...), reported by Rob Bloodgood.
108	root	1.162
109	root	1.161	3.05 Thu Jun 19 23:23:52 CEST 2008
110	root	1.160	- work around perl overriding readdir etc. with thread-unsafe
111	root	1.161	(sic!) versions.
112	root	1.160
113	root	1.159	3.04 Wed Jun 18 01:35:38 CEST 2008
114			- (libeio) fix eio_mknod, which confused it's arguments.
115	root	1.158	- (libeio) do not use readdir_r, as Ulrich Drepper pointed out that this
116			is stupid.
117	root	1.159	- (libeio) fix eio__readahead prototype, patch by Jost Krieger.
118			- (libeio) fix a bug that could potentially cause IO::AIO
119			not to get initialised properly.
120	root	1.158
121	root	1.157	3.03 Thu May 29 05:33:30 CEST 2008
122	root	1.153	- (libeio) correctly call pthread_attr_destroy ().
123	root	1.155	- (libeio) work around broken bsd headers once more.
124	root	1.154	- reduce shared library size again by not including wrappers.
125	root	1.156	- max_outstanding could cause poll to enter a busy-waiting loop.
126			- document the new IO::AIO::poll_cb result value.
127	root	1.153
128	root	1.152	3.02 Mon May 12 02:32:02 CEST 2008
129	root	1.150	- fix a memory leak on aio_readlink.
130			- bring back working fchmod.
131	root	1.151	- nop and busy now set result to 0.
132			- set errno to ENOMEM when allocation fails.
133	root	1.150
134	root	1.149	3.01 Sun May 11 03:07:03 CEST 2008
135			- (libeio) make it compile on systems without readahead or readdir_r.
136	root	1.148	- (libeio) improve configure check for readahead availability.
137			- do not try to link against -lrt.
138	root	1.147	- use a separate configure script for IO::AIO (not the libeio one).
139
140	root	1.146	3.0 Sun May 11 00:57:14 CEST 2008
141	root	1.145	- added bin/treescan to the distribution.
142			- switched to using libeio.
143			- LOTS OF INCOMPATIBLE CHANGES:
144			- remove signal functionality, it is not worth the effort.
145			- max_outstanding no longer returns the previous number of requests.
146			- poll_cb no longer returns number of requests.
147	root	1.143
148	root	1.142	2.62 Sat Apr 26 13:59:33 CEST 2008
149	root	1.141	- port to solaris perls configured for old posix
150			(analysed by Jost Krieger).
151	root	1.142	- keep a reference to the perl filehandle object in aio_close,
152			so it doesn't get closed prematurely, leading to ugly races.
153	root	1.141
154	root	1.140	2.61 Wed Apr 16 18:45:02 CEST 2008
155	root	1.137	- fix treescan output duplication and improve output ordering.
156			also display files given on the commandline.
157	root	1.140	- use a different algorithm for aio_close that is faster
158			and probably has even lower chances of blocking.
159	root	1.138	- do our own stack memory management for threads - linux
160			allocates outrageous amounts of VM (not so bad unless you
161			use mlockall...), which severely limits the number of threads
162	root	1.139	on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
163			and 4096 * sizeof (long) (usually this is 16..64k).
164	root	1.137
165	root	1.136	2.6 Sun Mar 30 08:28:11 CEST 2008
166	root	1.134	- added aio_sync.
167	root	1.135	- added aio_pathsync.
168	root	1.136	- fix prototypes of (void) functions.
169	root	1.134
170	root	1.133	2.51 Sat Oct 6 16:04:54 CEST 2007
171			- perlio isn't generally threadsafe, so aio_close could not work reliably.
172			aio_close now tries a safe hack that might not be that asynchronous
173			(see the manpage for details).
174			- discard callback return values as to not grow the stack endlessly
175			when poll_cb handles many requests without returning.
176			- minor code cleanups.
177
178	root	1.132	2.5 Thu Oct 4 14:49:08 CEST 2007
179	root	1.131	- replaced _fd2fh with faster xs code.
180			- aio_close will now try to do "the right thing" and thus might
181			work sensibly for the very first time.
182
183	root	1.130	2.41 Mon Sep 24 21:28:21 CEST 2007
184	root	1.129	- after fork, invest some work to make sure that the poll_fileno
185			stays stable (by dup2'ing the new fd over the old one), to make
186			it easier for programs/libs that don't control their forking
187			behaviour and cannot recreate their watchers.
188
189	root	1.128	2.4 Sun Aug 5 18:44:22 CEST 2007
190	root	1.127	- add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
191			successfully demonstrated that you can block on futimes...).
192	root	1.124	- allow undef as fileoffset for aio_read/write and use read/write(2)
193			internally (useful for sockets or O_APPEND handles).
194	root	1.126	- allow undef for length in aio_write.
195			- negative dataoffsets work as expected now in aio_read/aio_write.
196	root	1.124	- use NV instead of UV for 32 bit perls and file offsets, as NVs
197	root	1.125	have a larger range then.
198	root	1.120	- shared code between BDB and IO::AIO.
199	root	1.127	- aio_busy was completely broken. now fixed.
200			- readahead emulation now returns something.
201	root	1.121	- correctly set errno to ENOSYS on unimplemented functions
202			(should never happen, though).
203	root	1.127	- large changes to make it partially compile and run on win32,
204			but win32 lacks too much functionality, and perl overrides way
205			too many functions with crashing versions.
206	root	1.120
207	root	1.119	2.33 Tue Jan 23 23:55:41 CET 2007
208			- fix install path (Andreas J. Koenig).
209
210	root	1.118	2.32 Mon Jan 22 16:56:23 CET 2007
211	root	1.114	- added aio_rmtree.
212	root	1.115	- wow, aio_mkdir was missing.
213	root	1.116	- aio_load did return undef on error, not -1.
214	root	1.117	- use prefixexp not prefix in autoconf.pm
215			(suggested by ... rt.cpan.org unreachable).
216	root	1.118	- avoid installing autoconf.pm.
217	root	1.114
218	root	1.113	2.31 Sat Jan 6 03:46:02 CET 2007
219	root	1.112	- added aio_load.
220
221	root	1.111	2.3 Sat Dec 23 05:48:07 CET 2006
222			- fix off-by-one bug in aio_read, causing memory corruption
223			or crashes.
224
225	root	1.110	2.21 Fri Dec 22 05:03:38 CET 2006
226	root	1.108	- minor doc updates.
227	root	1.107	- minor cleanups.
228			- IO::AIO::poll returns request count.
229	root	1.109	- undocumented and unfinished async-signal-reporting.
230	root	1.107
231	root	1.103	2.2 Tue Oct 31 00:31:00 CET 2006
232	root	1.100	- minor doc updates.
233	root	1.101	- added aio_readlink.
234			- properly zero-terminate aio_read buffer.
235			- fix aio_read/write with nonzero dataoffset.
236	root	1.104	- reduced size of aio request structure.
237	root	1.106	- better diagnostics when pathnames etc. are not byte-encoded;
238	root	1.105	do not leak request in that case, either.
239	root	1.94
240	root	1.99	2.1 Sun Oct 29 02:01:57 CET 2006
241	root	1.98	- INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
242			IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
243	root	1.95	- fix a bug in aio_move where it would fail everytime
244			it would have to copy files manually.
245	root	1.98	- doc updates.
246	root	1.94	- start threads only on (very low) demand.
247	root	1.97	- end superfluous threads automatically after 10s idling.
248	root	1.98	- add IO::AIO::max_idle to control this.
249	root	1.94	- some tuning applied to random places.
250	root	1.95	- add aio_mknod.
251	root	1.59
252	root	1.92	2.0 Thu Oct 26 18:27:58 CEST 2006
253	root	1.90	- minor incompatibility: max_outstanding semantics have changed.
254	root	1.86	- major rewrite, consider all functionality EXPERIMENTAL.
255	root	1.68	- aio requests can be cancelled.
256	root	1.81	- callbacks can be (re-)set later.
257	root	1.93	- aio requests can choose between 9 priorities.
258	root	1.83	- add aio_group: aio requests can be grouped
259			into composite requests.
260			- generator interface for groups.
261	root	1.89	- add IO::AIO::poll_some.
262	root	1.72	- major documentation improvements.
263			- very minor bugfixes.
264	root	1.76	- add aio_nop for dummy requests.
265	root	1.84	- add aio_busy mainly for benchmarking and debugging.
266	root	1.79	- use "fast" mutexes on linux.
267	root	1.80	- use dynamic (and larger) buffers instead of
268			putting them onto the stack.
269			- optimise x86 and amd64 a bit.
270			- better error checking when ENOMEM.
271	root	1.85	- hopefully fix mem and dirp leaks on fork.
272	root	1.92	- warn about broken perl malloc.
273	root	1.88	- compiles on cygwin (but pread is broken on cygwin
274			which is not detected by autoconf, so you have to
275			edit autoconf/config.h yourself to enable emulation).
276	root	1.68
277	root	1.67	1.8 Sat Jun 24 22:20:44 CEST 2006
278	root	1.66	- add and/or document aio_rename, aio_link, aio_symlink and aio_move.
279
280	root	1.65	1.73 Wed Mar 1 22:49:32 CET 2006
281			- codename "jost"
282			- AIX/Solaris(?) aren't being helpful again, hardcode a value
283			for NAME_MAX and drive with your eyes closed (reported by
284			wcooley@nakedape.cc).
285	root	1.63
286	root	1.62	1.72 Thu Feb 2 00:40:44 CET 2006
287	root	1.61	- another minor bug in aio_scandir, again, the callback was called
288			twice when the directory can't be stat'ed.
289
290	root	1.60	1.71 Mon Dec 26 20:20:03 CET 2005
291			- grr, another minor bug in aio_scandir, this time resulting
292			in a runtime error.
293
294	root	1.59	1.7 Mon Dec 26 19:29:48 CET 2005
295	root	1.58	- aio_scandir errornously called callback twice in some cases.
296	root	1.57	- added AnyEvent example.
297
298	root	1.55	1.61 Wed Sep 7 19:40:42 CEST 2005
299	root	1.54	- no longer include $Config{libs}, as distros include too much
300	root	1.56	garbage in there that is not installed on typical systems
301	root	1.54	(for example, debian links perl against -lgdbm and many more
302			libraries despite perl not needing it, slowing down startup and
303			wasting memory).
304
305	root	1.53	1.6 Tue Aug 30 17:44:44 CEST 2005
306			- added aio_readdir, aio_scandir.
307	root	1.51	- added aio_sendfile, including sendfile emulation when sendfile
308			isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
309			support is unavailable on my solaris 8 machine, but preliminary
310			code is there. What's lacking is configury stuff and testing...).
311	root	1.46
312	root	1.44	1.5 Sat Aug 20 02:32:19 CEST 2005
313	root	1.51	- create the aio threads on demand only (good after forking).
314	root	1.41	- somebody nagged about C89 compatibility, so this release should
315	root	1.42	be C89 compatible, but no guarantees for future ones.
316	root	1.43	- abort when the configure script fails.
317	root	1.41
318	root	1.40	1.4 Wed Aug 17 08:07:27 CEST 2005
319	root	1.93	- forgot to recreate the pipe after forking, this could cause
320	root	1.40	deadlocks.
321
322	root	1.39	1.3 Wed Aug 17 07:25:54 CEST 2005
323	root	1.33	- properly propagate exceptions from callbacks, instead of silently
324			eating them.
325	root	1.38	- use a different fork algorithm that avoids recursive callback
326			invocations and reduces fork latency in busy processes.
327	root	1.37	- fix a bug where the buffer scalar in aio_read got assigned the wrong
328			length after reading.
329			- fix a bug where the child would process some outstanding requests
330			from the parent.
331			- make a copy of the callback scalar, to avoid some very uncommon
332			(but valid) usages where the callback scalar changes.
333			- the callback was never freed in aio_read/aio_write.
334	root	1.38	- aio_read/aio_write will now set the readonly flag on the data
335			scalar for better error reporting.
336	root	1.33
337	root	1.32	1.2 Wed Aug 17 01:22:58 CEST 2005
338			- verified on cygwin, linux/amd64+ia32+alpha, solaris.
339	root	1.31	- use SvPVbyte for filenames now. You need to encode your strings to
340			the external filename encoding first.
341	root	1.32	- fix the bug where filehandles could leak (again).
342	root	1.31	- clarify freebsd situation: make it work and tell me how, or go away
343			with your underdocumented, broken and outdated OS.
344			- fork'ing should now be officially supported (where linux and
345			posix contradict each other, I followed posix).
346	root	1.32	- only call read() once per poll, not twice (speedup).
347			- new functions: aio_rmdir, aio_symlink.
348	root	1.31	- force callback arguments to be undef or a reference, for better
349			error catching.
350	root	1.1
351	root	1.29	1.1 Sun Aug 7 05:27:23 CEST 2005
352	root	1.25	- added configure script to detect availability of some calls.
353	root	1.27	(imperfect, as we cannot detect things like -lrt due to missing
354	root	1.23	feedback yet).
355	root	1.27	- emulate fdatasync via fsync, pread/pwrite via unsafe read/write
356			and readahead via manual reading on platforms lacking those.
357	root	1.19	- ported t/03_errors.t+framework by Brad Fitzpatrick
358			from Linux::AIO.
359	root	1.18	- removed XOPEN_SOURCE because stupid solaris 9 doesn't
360			compile with it enabled. Probably breaks others. Oh well.
361	root	1.24	- try to be more careful with errno on non-threaded perls.
362	root	1.26	- cygwins perl insisted on a matching open mode when morphing
363			the fd to an fh.
364	root	1.28	- convert sv's to "byte" encoding in aio_read/aio_write. Might
365			do that for pathnames, too, in the future, so make sure you
366			properly encode your pathnames.
367	root	1.18
368	root	1.17	1.0 Fri Jul 22 10:43:30 CEST 2005
369			- aio_open did not reliably deliver (open) filehandles.
370	root	1.16	- all aio_*-functions keep a reference to the filehandle so
371			it doesn't go away while the aio requests is working on it.
372			- disable warnings in AIO.pm.
373
374	root	1.15	0.9 Wed Jul 20 23:55:04 CEST 2005
375			- allow recursive calls to poll_cb, use less locking calls, too.
376			- fix the Gtk2-example in the SYNOPSIS.
377	root	1.14	- use pread/pwrite not pread64/pwrite64. this was simply a leftover
378			from Linux::AIO.
379			(found by compiling on cygwin. Unfortunately, cygwin declares but
380			does not implement pread/pwrite).
381			- only include <sys/syscall.h> on linux.
382
383	root	1.13	0.5 Tue Jul 12 13:03:09 CEST 2005
384	root	1.12	- removed #include <endian.h>, it's not portable, and we don't
385			need it anyway.
386			- link against -lrt, as it might contain goodies such as fdatasync,
387			and often aio_read, which we do not use yet, but it shouldn't hurt.
388
389	root	1.11	0.4 Mon Jul 11 05:28:25 CEST 2005
390	root	1.9	- added IO::AIO::flush, IO::AIO::poll.
391	root	1.10	- make callback argument optional for all calls.
392	root	1.8
393	root	1.7	0.3 Mon Jul 11 01:42:37 CEST 2005
394	root	1.5	- restructured manpage.
395	root	1.7	- added SYNOPSIS with examples for Event, Glib, Tk.
396			- remove explicit context support so I don't have to maintain
397			it for threaded perls (i.e. it should work now :).
398	root	1.5
399	root	1.4	0.2 Sun Jul 10 22:57:12 CEST 2005
400	root	1.2	- return immediately from poll_wait if nreqs==0.
401			- get rid of the request pipe and use faster thread-thread
402	root	1.3	communications for most requests and responses.
403	root	1.2
404	root	1.1	0.1
405			- cloned from Linux::AIO, which is very similar.
406