[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/sync_file_range? (http://kerneltrap.org/node/6505 http://lwn.net/Articles/178199/)
TODO: aio_fcntl, at least for file-locking

        - added aio_sync_file_range.

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:	1.175
Committed:	Wed Oct 22 18:15:36 2008 UTC (15 years, 7 months ago) by root
Branch:	MAIN
Changes since 1.174:	+2 -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	1.123	TODO: splice/tee/vmsplice/sync_file_range? (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	1.175	- added aio_sync_file_range.
10
11	root	1.174	3.16 Wed Oct 22 18:28:01 CEST 2008
12	root	1.173	- use SvREFCNT_inc instead of SvREFCNT_inc_NN in a non-speed critical
13			part to improve portability to perl 5.8 (reported by szymon).
14
15	root	1.172	3.15 Mon Oct 13 00:39:55 CEST 2008
16	root	1.171	- automatic removal of feeders was broken.
17			- (libeio) use a more robust method to detect whether a feeder
18			has added something to the group or not.
19
20	root	1.170	3.1 Thu Oct 2 13:34:40 CEST 2008
21	root	1.168	- pre-deref the passed callback object, for increased speed
22			and decreased memory usage.
23	root	1.167	- call on_next_submit callback even for aio_group - impact unknown,
24	root	1.166	but seems more correct.
25	root	1.168	- $req->cb now returns the original callback.
26	root	1.166	- (libeio) pass EIO_GROUP/aio_group requests through the queue without
27			requiring a thread switch.
28	root	1.169	- (libeio) status code of aio_futime and aio_utime was always passed 0.
29	root	1.166	- do some other µ-optimisations.
30
31	root	1.165	3.07 Sat Aug 2 16:06:13 CEST 2008
32			- do not include LIBS in autoconf tests.
33
34	root	1.164	3.06 Tue Jul 15 12:41:32 CEST 2008
35	root	1.162	- move preadwritelock definition before it's first reference,
36	root	1.164	to make it compile again on broken platforms (they still exist)
37			or badly cofngiured perls (redhat...), reported by Rob Bloodgood.
38	root	1.162
39	root	1.161	3.05 Thu Jun 19 23:23:52 CEST 2008
40	root	1.160	- work around perl overriding readdir etc. with thread-unsafe
41	root	1.161	(sic!) versions.
42	root	1.160
43	root	1.159	3.04 Wed Jun 18 01:35:38 CEST 2008
44			- (libeio) fix eio_mknod, which confused it's arguments.
45	root	1.158	- (libeio) do not use readdir_r, as Ulrich Drepper pointed out that this
46			is stupid.
47	root	1.159	- (libeio) fix eio__readahead prototype, patch by Jost Krieger.
48			- (libeio) fix a bug that could potentially cause IO::AIO
49			not to get initialised properly.
50	root	1.158
51	root	1.157	3.03 Thu May 29 05:33:30 CEST 2008
52	root	1.153	- (libeio) correctly call pthread_attr_destroy ().
53	root	1.155	- (libeio) work around broken bsd headers once more.
54	root	1.154	- reduce shared library size again by not including wrappers.
55	root	1.156	- max_outstanding could cause poll to enter a busy-waiting loop.
56			- document the new IO::AIO::poll_cb result value.
57	root	1.153
58	root	1.152	3.02 Mon May 12 02:32:02 CEST 2008
59	root	1.150	- fix a memory leak on aio_readlink.
60			- bring back working fchmod.
61	root	1.151	- nop and busy now set result to 0.
62			- set errno to ENOMEM when allocation fails.
63	root	1.150
64	root	1.149	3.01 Sun May 11 03:07:03 CEST 2008
65			- (libeio) make it compile on systems without readahead or readdir_r.
66	root	1.148	- (libeio) improve configure check for readahead availability.
67			- do not try to link against -lrt.
68	root	1.147	- use a separate configure script for IO::AIO (not the libeio one).
69
70	root	1.146	3.0 Sun May 11 00:57:14 CEST 2008
71	root	1.145	- added bin/treescan to the distribution.
72			- switched to using libeio.
73			- LOTS OF INCOMPATIBLE CHANGES:
74			- remove signal functionality, it is not worth the effort.
75			- max_outstanding no longer returns the previous number of requests.
76			- poll_cb no longer returns number of requests.
77	root	1.143
78	root	1.142	2.62 Sat Apr 26 13:59:33 CEST 2008
79	root	1.141	- port to solaris perls configured for old posix
80			(analysed by Jost Krieger).
81	root	1.142	- keep a reference to the perl filehandle object in aio_close,
82			so it doesn't get closed prematurely, leading to ugly races.
83	root	1.141
84	root	1.140	2.61 Wed Apr 16 18:45:02 CEST 2008
85	root	1.137	- fix treescan output duplication and improve output ordering.
86			also display files given on the commandline.
87	root	1.140	- use a different algorithm for aio_close that is faster
88			and probably has even lower chances of blocking.
89	root	1.138	- do our own stack memory management for threads - linux
90			allocates outrageous amounts of VM (not so bad unless you
91			use mlockall...), which severely limits the number of threads
92	root	1.139	on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
93			and 4096 * sizeof (long) (usually this is 16..64k).
94	root	1.137
95	root	1.136	2.6 Sun Mar 30 08:28:11 CEST 2008
96	root	1.134	- added aio_sync.
97	root	1.135	- added aio_pathsync.
98	root	1.136	- fix prototypes of (void) functions.
99	root	1.134
100	root	1.133	2.51 Sat Oct 6 16:04:54 CEST 2007
101			- perlio isn't generally threadsafe, so aio_close could not work reliably.
102			aio_close now tries a safe hack that might not be that asynchronous
103			(see the manpage for details).
104			- discard callback return values as to not grow the stack endlessly
105			when poll_cb handles many requests without returning.
106			- minor code cleanups.
107
108	root	1.132	2.5 Thu Oct 4 14:49:08 CEST 2007
109	root	1.131	- replaced _fd2fh with faster xs code.
110			- aio_close will now try to do "the right thing" and thus might
111			work sensibly for the very first time.
112
113	root	1.130	2.41 Mon Sep 24 21:28:21 CEST 2007
114	root	1.129	- after fork, invest some work to make sure that the poll_fileno
115			stays stable (by dup2'ing the new fd over the old one), to make
116			it easier for programs/libs that don't control their forking
117			behaviour and cannot recreate their watchers.
118
119	root	1.128	2.4 Sun Aug 5 18:44:22 CEST 2007
120	root	1.127	- add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
121			successfully demonstrated that you can block on futimes...).
122	root	1.124	- allow undef as fileoffset for aio_read/write and use read/write(2)
123			internally (useful for sockets or O_APPEND handles).
124	root	1.126	- allow undef for length in aio_write.
125			- negative dataoffsets work as expected now in aio_read/aio_write.
126	root	1.124	- use NV instead of UV for 32 bit perls and file offsets, as NVs
127	root	1.125	have a larger range then.
128	root	1.120	- shared code between BDB and IO::AIO.
129	root	1.127	- aio_busy was completely broken. now fixed.
130			- readahead emulation now returns something.
131	root	1.121	- correctly set errno to ENOSYS on unimplemented functions
132			(should never happen, though).
133	root	1.127	- large changes to make it partially compile and run on win32,
134			but win32 lacks too much functionality, and perl overrides way
135			too many functions with crashing versions.
136	root	1.120
137	root	1.119	2.33 Tue Jan 23 23:55:41 CET 2007
138			- fix install path (Andreas J. Koenig).
139
140	root	1.118	2.32 Mon Jan 22 16:56:23 CET 2007
141	root	1.114	- added aio_rmtree.
142	root	1.115	- wow, aio_mkdir was missing.
143	root	1.116	- aio_load did return undef on error, not -1.
144	root	1.117	- use prefixexp not prefix in autoconf.pm
145			(suggested by ... rt.cpan.org unreachable).
146	root	1.118	- avoid installing autoconf.pm.
147	root	1.114
148	root	1.113	2.31 Sat Jan 6 03:46:02 CET 2007
149	root	1.112	- added aio_load.
150
151	root	1.111	2.3 Sat Dec 23 05:48:07 CET 2006
152			- fix off-by-one bug in aio_read, causing memory corruption
153			or crashes.
154
155	root	1.110	2.21 Fri Dec 22 05:03:38 CET 2006
156	root	1.108	- minor doc updates.
157	root	1.107	- minor cleanups.
158			- IO::AIO::poll returns request count.
159	root	1.109	- undocumented and unfinished async-signal-reporting.
160	root	1.107
161	root	1.103	2.2 Tue Oct 31 00:31:00 CET 2006
162	root	1.100	- minor doc updates.
163	root	1.101	- added aio_readlink.
164			- properly zero-terminate aio_read buffer.
165			- fix aio_read/write with nonzero dataoffset.
166	root	1.104	- reduced size of aio request structure.
167	root	1.106	- better diagnostics when pathnames etc. are not byte-encoded;
168	root	1.105	do not leak request in that case, either.
169	root	1.94
170	root	1.99	2.1 Sun Oct 29 02:01:57 CET 2006
171	root	1.98	- INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
172			IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
173	root	1.95	- fix a bug in aio_move where it would fail everytime
174			it would have to copy files manually.
175	root	1.98	- doc updates.
176	root	1.94	- start threads only on (very low) demand.
177	root	1.97	- end superfluous threads automatically after 10s idling.
178	root	1.98	- add IO::AIO::max_idle to control this.
179	root	1.94	- some tuning applied to random places.
180	root	1.95	- add aio_mknod.
181	root	1.59
182	root	1.92	2.0 Thu Oct 26 18:27:58 CEST 2006
183	root	1.90	- minor incompatibility: max_outstanding semantics have changed.
184	root	1.86	- major rewrite, consider all functionality EXPERIMENTAL.
185	root	1.68	- aio requests can be cancelled.
186	root	1.81	- callbacks can be (re-)set later.
187	root	1.93	- aio requests can choose between 9 priorities.
188	root	1.83	- add aio_group: aio requests can be grouped
189			into composite requests.
190			- generator interface for groups.
191	root	1.89	- add IO::AIO::poll_some.
192	root	1.72	- major documentation improvements.
193			- very minor bugfixes.
194	root	1.76	- add aio_nop for dummy requests.
195	root	1.84	- add aio_busy mainly for benchmarking and debugging.
196	root	1.79	- use "fast" mutexes on linux.
197	root	1.80	- use dynamic (and larger) buffers instead of
198			putting them onto the stack.
199			- optimise x86 and amd64 a bit.
200			- better error checking when ENOMEM.
201	root	1.85	- hopefully fix mem and dirp leaks on fork.
202	root	1.92	- warn about broken perl malloc.
203	root	1.88	- compiles on cygwin (but pread is broken on cygwin
204			which is not detected by autoconf, so you have to
205			edit autoconf/config.h yourself to enable emulation).
206	root	1.68
207	root	1.67	1.8 Sat Jun 24 22:20:44 CEST 2006
208	root	1.66	- add and/or document aio_rename, aio_link, aio_symlink and aio_move.
209
210	root	1.65	1.73 Wed Mar 1 22:49:32 CET 2006
211			- codename "jost"
212			- AIX/Solaris(?) aren't being helpful again, hardcode a value
213			for NAME_MAX and drive with your eyes closed (reported by
214			wcooley@nakedape.cc).
215	root	1.63
216	root	1.62	1.72 Thu Feb 2 00:40:44 CET 2006
217	root	1.61	- another minor bug in aio_scandir, again, the callback was called
218			twice when the directory can't be stat'ed.
219
220	root	1.60	1.71 Mon Dec 26 20:20:03 CET 2005
221			- grr, another minor bug in aio_scandir, this time resulting
222			in a runtime error.
223
224	root	1.59	1.7 Mon Dec 26 19:29:48 CET 2005
225	root	1.58	- aio_scandir errornously called callback twice in some cases.
226	root	1.57	- added AnyEvent example.
227
228	root	1.55	1.61 Wed Sep 7 19:40:42 CEST 2005
229	root	1.54	- no longer include $Config{libs}, as distros include too much
230	root	1.56	garbage in there that is not installed on typical systems
231	root	1.54	(for example, debian links perl against -lgdbm and many more
232			libraries despite perl not needing it, slowing down startup and
233			wasting memory).
234
235	root	1.53	1.6 Tue Aug 30 17:44:44 CEST 2005
236			- added aio_readdir, aio_scandir.
237	root	1.51	- added aio_sendfile, including sendfile emulation when sendfile
238			isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
239			support is unavailable on my solaris 8 machine, but preliminary
240			code is there. What's lacking is configury stuff and testing...).
241	root	1.46
242	root	1.44	1.5 Sat Aug 20 02:32:19 CEST 2005
243	root	1.51	- create the aio threads on demand only (good after forking).
244	root	1.41	- somebody nagged about C89 compatibility, so this release should
245	root	1.42	be C89 compatible, but no guarantees for future ones.
246	root	1.43	- abort when the configure script fails.
247	root	1.41
248	root	1.40	1.4 Wed Aug 17 08:07:27 CEST 2005
249	root	1.93	- forgot to recreate the pipe after forking, this could cause
250	root	1.40	deadlocks.
251
252	root	1.39	1.3 Wed Aug 17 07:25:54 CEST 2005
253	root	1.33	- properly propagate exceptions from callbacks, instead of silently
254			eating them.
255	root	1.38	- use a different fork algorithm that avoids recursive callback
256			invocations and reduces fork latency in busy processes.
257	root	1.37	- fix a bug where the buffer scalar in aio_read got assigned the wrong
258			length after reading.
259			- fix a bug where the child would process some outstanding requests
260			from the parent.
261			- make a copy of the callback scalar, to avoid some very uncommon
262			(but valid) usages where the callback scalar changes.
263			- the callback was never freed in aio_read/aio_write.
264	root	1.38	- aio_read/aio_write will now set the readonly flag on the data
265			scalar for better error reporting.
266	root	1.33
267	root	1.32	1.2 Wed Aug 17 01:22:58 CEST 2005
268			- verified on cygwin, linux/amd64+ia32+alpha, solaris.
269	root	1.31	- use SvPVbyte for filenames now. You need to encode your strings to
270			the external filename encoding first.
271	root	1.32	- fix the bug where filehandles could leak (again).
272	root	1.31	- clarify freebsd situation: make it work and tell me how, or go away
273			with your underdocumented, broken and outdated OS.
274			- fork'ing should now be officially supported (where linux and
275			posix contradict each other, I followed posix).
276	root	1.32	- only call read() once per poll, not twice (speedup).
277			- new functions: aio_rmdir, aio_symlink.
278	root	1.31	- force callback arguments to be undef or a reference, for better
279			error catching.
280	root	1.1
281	root	1.29	1.1 Sun Aug 7 05:27:23 CEST 2005
282	root	1.25	- added configure script to detect availability of some calls.
283	root	1.27	(imperfect, as we cannot detect things like -lrt due to missing
284	root	1.23	feedback yet).
285	root	1.27	- emulate fdatasync via fsync, pread/pwrite via unsafe read/write
286			and readahead via manual reading on platforms lacking those.
287	root	1.19	- ported t/03_errors.t+framework by Brad Fitzpatrick
288			from Linux::AIO.
289	root	1.18	- removed XOPEN_SOURCE because stupid solaris 9 doesn't
290			compile with it enabled. Probably breaks others. Oh well.
291	root	1.24	- try to be more careful with errno on non-threaded perls.
292	root	1.26	- cygwins perl insisted on a matching open mode when morphing
293			the fd to an fh.
294	root	1.28	- convert sv's to "byte" encoding in aio_read/aio_write. Might
295			do that for pathnames, too, in the future, so make sure you
296			properly encode your pathnames.
297	root	1.18
298	root	1.17	1.0 Fri Jul 22 10:43:30 CEST 2005
299			- aio_open did not reliably deliver (open) filehandles.
300	root	1.16	- all aio_*-functions keep a reference to the filehandle so
301			it doesn't go away while the aio requests is working on it.
302			- disable warnings in AIO.pm.
303
304	root	1.15	0.9 Wed Jul 20 23:55:04 CEST 2005
305			- allow recursive calls to poll_cb, use less locking calls, too.
306			- fix the Gtk2-example in the SYNOPSIS.
307	root	1.14	- use pread/pwrite not pread64/pwrite64. this was simply a leftover
308			from Linux::AIO.
309			(found by compiling on cygwin. Unfortunately, cygwin declares but
310			does not implement pread/pwrite).
311			- only include <sys/syscall.h> on linux.
312
313	root	1.13	0.5 Tue Jul 12 13:03:09 CEST 2005
314	root	1.12	- removed #include <endian.h>, it's not portable, and we don't
315			need it anyway.
316			- link against -lrt, as it might contain goodies such as fdatasync,
317			and often aio_read, which we do not use yet, but it shouldn't hurt.
318
319	root	1.11	0.4 Mon Jul 11 05:28:25 CEST 2005
320	root	1.9	- added IO::AIO::flush, IO::AIO::poll.
321	root	1.10	- make callback argument optional for all calls.
322	root	1.8
323	root	1.7	0.3 Mon Jul 11 01:42:37 CEST 2005
324	root	1.5	- restructured manpage.
325	root	1.7	- added SYNOPSIS with examples for Event, Glib, Tk.
326			- remove explicit context support so I don't have to maintain
327			it for threaded perls (i.e. it should work now :).
328	root	1.5
329	root	1.4	0.2 Sun Jul 10 22:57:12 CEST 2005
330	root	1.2	- return immediately from poll_wait if nreqs==0.
331			- get rid of the request pipe and use faster thread-thread
332	root	1.3	communications for most requests and responses.
333	root	1.2
334	root	1.1	0.1
335			- cloned from Linux::AIO, which is very similar.
336