[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

3.23 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:	1.193
Committed:	Sat Jun 13 14:58:33 2009 UTC (14 years, 11 months ago) by root
Branch:	MAIN
CVS Tags:	rel-3_23
Changes since 1.192:	+4 -0 lines
Log Message:	3.23
#	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	1.193	3.23 Sat Jun 13 16:57:58 CEST 2009
10			- fix off-by-one bug in aio_readdir that was introduced in the
11			rushed 3.22 release.
12
13	root	1.192	3.22 Sat Jun 13 15:32:40 CEST 2009
14	root	1.191	- speed up readdirx sort algorithm slightly.
15	root	1.192	- bin/treescan was missing from distro tarball.
16	root	1.191
17	root	1.190	3.21 Fri Jun 12 18:45:53 CEST 2009
18	root	1.187	- new options --dirs and --files for treescan.
19	root	1.188	- install bin/treescan by default.
20	root	1.189	- (libeio) aio_readdir can now be cancelled while executing.
21	root	1.190	- fix a printf format string for 64 bit systems (could lead
22			to problems on big endian 64 bit systems).
23			- do not use qsort() but our own algorithm: glibc initialises
24			the whole locale and I/O subsystem inside qsort, causing
25			a stack overflow on 32 bit machines. The new sort uses much less
26			stack and is more than twice as fast in typical situations.
27	root	1.187
28	root	1.186	3.2 Sun Jun 7 20:30:05 CEST 2009
29	root	1.182	- (libeio) pwrite emulation was even more flawed than intended and did
30			not restore the file offset.
31	root	1.183	- add aio_readdirx, which can return inode and filetype and sort
32			the names in various ways.
33	root	1.182	- unfortunately, utime, chmod, chown on an open file that has just
34			been written can easily block, which caused aio_copy to block the
35			process. no more!
36			- no longer rely on dst path in aio_copy when futime is available.
37
38	root	1.181	3.19 Tue Apr 21 22:05:21 CEST 2009
39			- more perl 5.10 workarounds for aio_read and write.
40			- aio_write no longer modifies the sv (if possible).
41			- aio_read now works correctly with magic values.
42
43	root	1.180	3.18 Sun Apr 19 21:17:32 CEST 2009
44	root	1.179	- better diagnostics when some aio_* functions get passed an illegal fh.
45	root	1.180	- try to avoid crashes due to incompatible 5.10 API changes. grmbl.
46	root	1.178
47	root	1.177	3.17 Thu Nov 20 08:45:36 CET 2008
48	root	1.176	- (libeio) added aio_sync_file_range (untested).
49	root	1.177	- add aio_busy to @IO::AIO::AIO_REQ.
50	root	1.175
51	root	1.174	3.16 Wed Oct 22 18:28:01 CEST 2008
52	root	1.173	- use SvREFCNT_inc instead of SvREFCNT_inc_NN in a non-speed critical
53			part to improve portability to perl 5.8 (reported by szymon).
54
55	root	1.172	3.15 Mon Oct 13 00:39:55 CEST 2008
56	root	1.171	- automatic removal of feeders was broken.
57			- (libeio) use a more robust method to detect whether a feeder
58			has added something to the group or not.
59
60	root	1.170	3.1 Thu Oct 2 13:34:40 CEST 2008
61	root	1.168	- pre-deref the passed callback object, for increased speed
62			and decreased memory usage.
63	root	1.167	- call on_next_submit callback even for aio_group - impact unknown,
64	root	1.166	but seems more correct.
65	root	1.168	- $req->cb now returns the original callback.
66	root	1.166	- (libeio) pass EIO_GROUP/aio_group requests through the queue without
67			requiring a thread switch.
68	root	1.169	- (libeio) status code of aio_futime and aio_utime was always passed 0.
69	root	1.166	- do some other µ-optimisations.
70
71	root	1.165	3.07 Sat Aug 2 16:06:13 CEST 2008
72			- do not include LIBS in autoconf tests.
73
74	root	1.164	3.06 Tue Jul 15 12:41:32 CEST 2008
75	root	1.162	- move preadwritelock definition before it's first reference,
76	root	1.164	to make it compile again on broken platforms (they still exist)
77			or badly cofngiured perls (redhat...), reported by Rob Bloodgood.
78	root	1.162
79	root	1.161	3.05 Thu Jun 19 23:23:52 CEST 2008
80	root	1.160	- work around perl overriding readdir etc. with thread-unsafe
81	root	1.161	(sic!) versions.
82	root	1.160
83	root	1.159	3.04 Wed Jun 18 01:35:38 CEST 2008
84			- (libeio) fix eio_mknod, which confused it's arguments.
85	root	1.158	- (libeio) do not use readdir_r, as Ulrich Drepper pointed out that this
86			is stupid.
87	root	1.159	- (libeio) fix eio__readahead prototype, patch by Jost Krieger.
88			- (libeio) fix a bug that could potentially cause IO::AIO
89			not to get initialised properly.
90	root	1.158
91	root	1.157	3.03 Thu May 29 05:33:30 CEST 2008
92	root	1.153	- (libeio) correctly call pthread_attr_destroy ().
93	root	1.155	- (libeio) work around broken bsd headers once more.
94	root	1.154	- reduce shared library size again by not including wrappers.
95	root	1.156	- max_outstanding could cause poll to enter a busy-waiting loop.
96			- document the new IO::AIO::poll_cb result value.
97	root	1.153
98	root	1.152	3.02 Mon May 12 02:32:02 CEST 2008
99	root	1.150	- fix a memory leak on aio_readlink.
100			- bring back working fchmod.
101	root	1.151	- nop and busy now set result to 0.
102			- set errno to ENOMEM when allocation fails.
103	root	1.150
104	root	1.149	3.01 Sun May 11 03:07:03 CEST 2008
105			- (libeio) make it compile on systems without readahead or readdir_r.
106	root	1.148	- (libeio) improve configure check for readahead availability.
107			- do not try to link against -lrt.
108	root	1.147	- use a separate configure script for IO::AIO (not the libeio one).
109
110	root	1.146	3.0 Sun May 11 00:57:14 CEST 2008
111	root	1.145	- added bin/treescan to the distribution.
112			- switched to using libeio.
113			- LOTS OF INCOMPATIBLE CHANGES:
114			- remove signal functionality, it is not worth the effort.
115			- max_outstanding no longer returns the previous number of requests.
116			- poll_cb no longer returns number of requests.
117	root	1.143
118	root	1.142	2.62 Sat Apr 26 13:59:33 CEST 2008
119	root	1.141	- port to solaris perls configured for old posix
120			(analysed by Jost Krieger).
121	root	1.142	- keep a reference to the perl filehandle object in aio_close,
122			so it doesn't get closed prematurely, leading to ugly races.
123	root	1.141
124	root	1.140	2.61 Wed Apr 16 18:45:02 CEST 2008
125	root	1.137	- fix treescan output duplication and improve output ordering.
126			also display files given on the commandline.
127	root	1.140	- use a different algorithm for aio_close that is faster
128			and probably has even lower chances of blocking.
129	root	1.138	- do our own stack memory management for threads - linux
130			allocates outrageous amounts of VM (not so bad unless you
131			use mlockall...), which severely limits the number of threads
132	root	1.139	on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
133			and 4096 * sizeof (long) (usually this is 16..64k).
134	root	1.137
135	root	1.136	2.6 Sun Mar 30 08:28:11 CEST 2008
136	root	1.134	- added aio_sync.
137	root	1.135	- added aio_pathsync.
138	root	1.136	- fix prototypes of (void) functions.
139	root	1.134
140	root	1.133	2.51 Sat Oct 6 16:04:54 CEST 2007
141			- perlio isn't generally threadsafe, so aio_close could not work reliably.
142			aio_close now tries a safe hack that might not be that asynchronous
143			(see the manpage for details).
144			- discard callback return values as to not grow the stack endlessly
145			when poll_cb handles many requests without returning.
146			- minor code cleanups.
147
148	root	1.132	2.5 Thu Oct 4 14:49:08 CEST 2007
149	root	1.131	- replaced _fd2fh with faster xs code.
150			- aio_close will now try to do "the right thing" and thus might
151			work sensibly for the very first time.
152
153	root	1.130	2.41 Mon Sep 24 21:28:21 CEST 2007
154	root	1.129	- after fork, invest some work to make sure that the poll_fileno
155			stays stable (by dup2'ing the new fd over the old one), to make
156			it easier for programs/libs that don't control their forking
157			behaviour and cannot recreate their watchers.
158
159	root	1.128	2.4 Sun Aug 5 18:44:22 CEST 2007
160	root	1.127	- add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
161			successfully demonstrated that you can block on futimes...).
162	root	1.124	- allow undef as fileoffset for aio_read/write and use read/write(2)
163			internally (useful for sockets or O_APPEND handles).
164	root	1.126	- allow undef for length in aio_write.
165			- negative dataoffsets work as expected now in aio_read/aio_write.
166	root	1.124	- use NV instead of UV for 32 bit perls and file offsets, as NVs
167	root	1.125	have a larger range then.
168	root	1.120	- shared code between BDB and IO::AIO.
169	root	1.127	- aio_busy was completely broken. now fixed.
170			- readahead emulation now returns something.
171	root	1.121	- correctly set errno to ENOSYS on unimplemented functions
172			(should never happen, though).
173	root	1.127	- large changes to make it partially compile and run on win32,
174			but win32 lacks too much functionality, and perl overrides way
175			too many functions with crashing versions.
176	root	1.120
177	root	1.119	2.33 Tue Jan 23 23:55:41 CET 2007
178			- fix install path (Andreas J. Koenig).
179
180	root	1.118	2.32 Mon Jan 22 16:56:23 CET 2007
181	root	1.114	- added aio_rmtree.
182	root	1.115	- wow, aio_mkdir was missing.
183	root	1.116	- aio_load did return undef on error, not -1.
184	root	1.117	- use prefixexp not prefix in autoconf.pm
185			(suggested by ... rt.cpan.org unreachable).
186	root	1.118	- avoid installing autoconf.pm.
187	root	1.114
188	root	1.113	2.31 Sat Jan 6 03:46:02 CET 2007
189	root	1.112	- added aio_load.
190
191	root	1.111	2.3 Sat Dec 23 05:48:07 CET 2006
192			- fix off-by-one bug in aio_read, causing memory corruption
193			or crashes.
194
195	root	1.110	2.21 Fri Dec 22 05:03:38 CET 2006
196	root	1.108	- minor doc updates.
197	root	1.107	- minor cleanups.
198			- IO::AIO::poll returns request count.
199	root	1.109	- undocumented and unfinished async-signal-reporting.
200	root	1.107
201	root	1.103	2.2 Tue Oct 31 00:31:00 CET 2006
202	root	1.100	- minor doc updates.
203	root	1.101	- added aio_readlink.
204			- properly zero-terminate aio_read buffer.
205			- fix aio_read/write with nonzero dataoffset.
206	root	1.104	- reduced size of aio request structure.
207	root	1.106	- better diagnostics when pathnames etc. are not byte-encoded;
208	root	1.105	do not leak request in that case, either.
209	root	1.94
210	root	1.99	2.1 Sun Oct 29 02:01:57 CET 2006
211	root	1.98	- INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
212			IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
213	root	1.95	- fix a bug in aio_move where it would fail everytime
214			it would have to copy files manually.
215	root	1.98	- doc updates.
216	root	1.94	- start threads only on (very low) demand.
217	root	1.97	- end superfluous threads automatically after 10s idling.
218	root	1.98	- add IO::AIO::max_idle to control this.
219	root	1.94	- some tuning applied to random places.
220	root	1.95	- add aio_mknod.
221	root	1.59
222	root	1.92	2.0 Thu Oct 26 18:27:58 CEST 2006
223	root	1.90	- minor incompatibility: max_outstanding semantics have changed.
224	root	1.86	- major rewrite, consider all functionality EXPERIMENTAL.
225	root	1.68	- aio requests can be cancelled.
226	root	1.81	- callbacks can be (re-)set later.
227	root	1.93	- aio requests can choose between 9 priorities.
228	root	1.83	- add aio_group: aio requests can be grouped
229			into composite requests.
230			- generator interface for groups.
231	root	1.89	- add IO::AIO::poll_some.
232	root	1.72	- major documentation improvements.
233			- very minor bugfixes.
234	root	1.76	- add aio_nop for dummy requests.
235	root	1.84	- add aio_busy mainly for benchmarking and debugging.
236	root	1.79	- use "fast" mutexes on linux.
237	root	1.80	- use dynamic (and larger) buffers instead of
238			putting them onto the stack.
239			- optimise x86 and amd64 a bit.
240			- better error checking when ENOMEM.
241	root	1.85	- hopefully fix mem and dirp leaks on fork.
242	root	1.92	- warn about broken perl malloc.
243	root	1.88	- compiles on cygwin (but pread is broken on cygwin
244			which is not detected by autoconf, so you have to
245			edit autoconf/config.h yourself to enable emulation).
246	root	1.68
247	root	1.67	1.8 Sat Jun 24 22:20:44 CEST 2006
248	root	1.66	- add and/or document aio_rename, aio_link, aio_symlink and aio_move.
249
250	root	1.65	1.73 Wed Mar 1 22:49:32 CET 2006
251			- codename "jost"
252			- AIX/Solaris(?) aren't being helpful again, hardcode a value
253			for NAME_MAX and drive with your eyes closed (reported by
254			wcooley@nakedape.cc).
255	root	1.63
256	root	1.62	1.72 Thu Feb 2 00:40:44 CET 2006
257	root	1.61	- another minor bug in aio_scandir, again, the callback was called
258			twice when the directory can't be stat'ed.
259
260	root	1.60	1.71 Mon Dec 26 20:20:03 CET 2005
261			- grr, another minor bug in aio_scandir, this time resulting
262			in a runtime error.
263
264	root	1.59	1.7 Mon Dec 26 19:29:48 CET 2005
265	root	1.58	- aio_scandir errornously called callback twice in some cases.
266	root	1.57	- added AnyEvent example.
267
268	root	1.55	1.61 Wed Sep 7 19:40:42 CEST 2005
269	root	1.54	- no longer include $Config{libs}, as distros include too much
270	root	1.56	garbage in there that is not installed on typical systems
271	root	1.54	(for example, debian links perl against -lgdbm and many more
272			libraries despite perl not needing it, slowing down startup and
273			wasting memory).
274
275	root	1.53	1.6 Tue Aug 30 17:44:44 CEST 2005
276			- added aio_readdir, aio_scandir.
277	root	1.51	- added aio_sendfile, including sendfile emulation when sendfile
278			isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
279			support is unavailable on my solaris 8 machine, but preliminary
280			code is there. What's lacking is configury stuff and testing...).
281	root	1.46
282	root	1.44	1.5 Sat Aug 20 02:32:19 CEST 2005
283	root	1.51	- create the aio threads on demand only (good after forking).
284	root	1.41	- somebody nagged about C89 compatibility, so this release should
285	root	1.42	be C89 compatible, but no guarantees for future ones.
286	root	1.43	- abort when the configure script fails.
287	root	1.41
288	root	1.40	1.4 Wed Aug 17 08:07:27 CEST 2005
289	root	1.93	- forgot to recreate the pipe after forking, this could cause
290	root	1.40	deadlocks.
291
292	root	1.39	1.3 Wed Aug 17 07:25:54 CEST 2005
293	root	1.33	- properly propagate exceptions from callbacks, instead of silently
294			eating them.
295	root	1.38	- use a different fork algorithm that avoids recursive callback
296			invocations and reduces fork latency in busy processes.
297	root	1.37	- fix a bug where the buffer scalar in aio_read got assigned the wrong
298			length after reading.
299			- fix a bug where the child would process some outstanding requests
300			from the parent.
301			- make a copy of the callback scalar, to avoid some very uncommon
302			(but valid) usages where the callback scalar changes.
303			- the callback was never freed in aio_read/aio_write.
304	root	1.38	- aio_read/aio_write will now set the readonly flag on the data
305			scalar for better error reporting.
306	root	1.33
307	root	1.32	1.2 Wed Aug 17 01:22:58 CEST 2005
308			- verified on cygwin, linux/amd64+ia32+alpha, solaris.
309	root	1.31	- use SvPVbyte for filenames now. You need to encode your strings to
310			the external filename encoding first.
311	root	1.32	- fix the bug where filehandles could leak (again).
312	root	1.31	- clarify freebsd situation: make it work and tell me how, or go away
313			with your underdocumented, broken and outdated OS.
314			- fork'ing should now be officially supported (where linux and
315			posix contradict each other, I followed posix).
316	root	1.32	- only call read() once per poll, not twice (speedup).
317			- new functions: aio_rmdir, aio_symlink.
318	root	1.31	- force callback arguments to be undef or a reference, for better
319			error catching.
320	root	1.1
321	root	1.29	1.1 Sun Aug 7 05:27:23 CEST 2005
322	root	1.25	- added configure script to detect availability of some calls.
323	root	1.27	(imperfect, as we cannot detect things like -lrt due to missing
324	root	1.23	feedback yet).
325	root	1.27	- emulate fdatasync via fsync, pread/pwrite via unsafe read/write
326			and readahead via manual reading on platforms lacking those.
327	root	1.19	- ported t/03_errors.t+framework by Brad Fitzpatrick
328			from Linux::AIO.
329	root	1.18	- removed XOPEN_SOURCE because stupid solaris 9 doesn't
330			compile with it enabled. Probably breaks others. Oh well.
331	root	1.24	- try to be more careful with errno on non-threaded perls.
332	root	1.26	- cygwins perl insisted on a matching open mode when morphing
333			the fd to an fh.
334	root	1.28	- convert sv's to "byte" encoding in aio_read/aio_write. Might
335			do that for pathnames, too, in the future, so make sure you
336			properly encode your pathnames.
337	root	1.18
338	root	1.17	1.0 Fri Jul 22 10:43:30 CEST 2005
339			- aio_open did not reliably deliver (open) filehandles.
340	root	1.16	- all aio_*-functions keep a reference to the filehandle so
341			it doesn't go away while the aio requests is working on it.
342			- disable warnings in AIO.pm.
343
344	root	1.15	0.9 Wed Jul 20 23:55:04 CEST 2005
345			- allow recursive calls to poll_cb, use less locking calls, too.
346			- fix the Gtk2-example in the SYNOPSIS.
347	root	1.14	- use pread/pwrite not pread64/pwrite64. this was simply a leftover
348			from Linux::AIO.
349			(found by compiling on cygwin. Unfortunately, cygwin declares but
350			does not implement pread/pwrite).
351			- only include <sys/syscall.h> on linux.
352
353	root	1.13	0.5 Tue Jul 12 13:03:09 CEST 2005
354	root	1.12	- removed #include <endian.h>, it's not portable, and we don't
355			need it anyway.
356			- link against -lrt, as it might contain goodies such as fdatasync,
357			and often aio_read, which we do not use yet, but it shouldn't hurt.
358
359	root	1.11	0.4 Mon Jul 11 05:28:25 CEST 2005
360	root	1.9	- added IO::AIO::flush, IO::AIO::poll.
361	root	1.10	- make callback argument optional for all calls.
362	root	1.8
363	root	1.7	0.3 Mon Jul 11 01:42:37 CEST 2005
364	root	1.5	- restructured manpage.
365	root	1.7	- added SYNOPSIS with examples for Event, Glib, Tk.
366			- remove explicit context support so I don't have to maintain
367			it for threaded perls (i.e. it should work now :).
368	root	1.5
369	root	1.4	0.2 Sun Jul 10 22:57:12 CEST 2005
370	root	1.2	- return immediately from poll_wait if nreqs==0.
371			- get rid of the request pipe and use faster thread-thread
372	root	1.3	communications for most requests and responses.
373	root	1.2
374	root	1.1	0.1
375			- cloned from Linux::AIO, which is very similar.
376