[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

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