[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

        - 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:	1.173
Committed:	Mon Oct 13 10:38:17 2008 UTC (15 years, 7 months ago) by root
Branch:	MAIN
Changes since 1.172:	+3 -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	1.123	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	1.173	- use SvREFCNT_inc instead of SvREFCNT_inc_NN in a non-speed critical
10			part to improve portability to perl 5.8 (reported by szymon).
11
12	root	1.172	3.15 Mon Oct 13 00:39:55 CEST 2008
13	root	1.171	- automatic removal of feeders was broken.
14			- (libeio) use a more robust method to detect whether a feeder
15			has added something to the group or not.
16
17	root	1.170	3.1 Thu Oct 2 13:34:40 CEST 2008
18	root	1.168	- pre-deref the passed callback object, for increased speed
19			and decreased memory usage.
20	root	1.167	- call on_next_submit callback even for aio_group - impact unknown,
21	root	1.166	but seems more correct.
22	root	1.168	- $req->cb now returns the original callback.
23	root	1.166	- (libeio) pass EIO_GROUP/aio_group requests through the queue without
24			requiring a thread switch.
25	root	1.169	- (libeio) status code of aio_futime and aio_utime was always passed 0.
26	root	1.166	- do some other µ-optimisations.
27
28	root	1.165	3.07 Sat Aug 2 16:06:13 CEST 2008
29			- do not include LIBS in autoconf tests.
30
31	root	1.164	3.06 Tue Jul 15 12:41:32 CEST 2008
32	root	1.162	- move preadwritelock definition before it's first reference,
33	root	1.164	to make it compile again on broken platforms (they still exist)
34			or badly cofngiured perls (redhat...), reported by Rob Bloodgood.
35	root	1.162
36	root	1.161	3.05 Thu Jun 19 23:23:52 CEST 2008
37	root	1.160	- work around perl overriding readdir etc. with thread-unsafe
38	root	1.161	(sic!) versions.
39	root	1.160
40	root	1.159	3.04 Wed Jun 18 01:35:38 CEST 2008
41			- (libeio) fix eio_mknod, which confused it's arguments.
42	root	1.158	- (libeio) do not use readdir_r, as Ulrich Drepper pointed out that this
43			is stupid.
44	root	1.159	- (libeio) fix eio__readahead prototype, patch by Jost Krieger.
45			- (libeio) fix a bug that could potentially cause IO::AIO
46			not to get initialised properly.
47	root	1.158
48	root	1.157	3.03 Thu May 29 05:33:30 CEST 2008
49	root	1.153	- (libeio) correctly call pthread_attr_destroy ().
50	root	1.155	- (libeio) work around broken bsd headers once more.
51	root	1.154	- reduce shared library size again by not including wrappers.
52	root	1.156	- max_outstanding could cause poll to enter a busy-waiting loop.
53			- document the new IO::AIO::poll_cb result value.
54	root	1.153
55	root	1.152	3.02 Mon May 12 02:32:02 CEST 2008
56	root	1.150	- fix a memory leak on aio_readlink.
57			- bring back working fchmod.
58	root	1.151	- nop and busy now set result to 0.
59			- set errno to ENOMEM when allocation fails.
60	root	1.150
61	root	1.149	3.01 Sun May 11 03:07:03 CEST 2008
62			- (libeio) make it compile on systems without readahead or readdir_r.
63	root	1.148	- (libeio) improve configure check for readahead availability.
64			- do not try to link against -lrt.
65	root	1.147	- use a separate configure script for IO::AIO (not the libeio one).
66
67	root	1.146	3.0 Sun May 11 00:57:14 CEST 2008
68	root	1.145	- added bin/treescan to the distribution.
69			- switched to using libeio.
70			- LOTS OF INCOMPATIBLE CHANGES:
71			- remove signal functionality, it is not worth the effort.
72			- max_outstanding no longer returns the previous number of requests.
73			- poll_cb no longer returns number of requests.
74	root	1.143
75	root	1.142	2.62 Sat Apr 26 13:59:33 CEST 2008
76	root	1.141	- port to solaris perls configured for old posix
77			(analysed by Jost Krieger).
78	root	1.142	- keep a reference to the perl filehandle object in aio_close,
79			so it doesn't get closed prematurely, leading to ugly races.
80	root	1.141
81	root	1.140	2.61 Wed Apr 16 18:45:02 CEST 2008
82	root	1.137	- fix treescan output duplication and improve output ordering.
83			also display files given on the commandline.
84	root	1.140	- use a different algorithm for aio_close that is faster
85			and probably has even lower chances of blocking.
86	root	1.138	- do our own stack memory management for threads - linux
87			allocates outrageous amounts of VM (not so bad unless you
88			use mlockall...), which severely limits the number of threads
89	root	1.139	on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
90			and 4096 * sizeof (long) (usually this is 16..64k).
91	root	1.137
92	root	1.136	2.6 Sun Mar 30 08:28:11 CEST 2008
93	root	1.134	- added aio_sync.
94	root	1.135	- added aio_pathsync.
95	root	1.136	- fix prototypes of (void) functions.
96	root	1.134
97	root	1.133	2.51 Sat Oct 6 16:04:54 CEST 2007
98			- perlio isn't generally threadsafe, so aio_close could not work reliably.
99			aio_close now tries a safe hack that might not be that asynchronous
100			(see the manpage for details).
101			- discard callback return values as to not grow the stack endlessly
102			when poll_cb handles many requests without returning.
103			- minor code cleanups.
104
105	root	1.132	2.5 Thu Oct 4 14:49:08 CEST 2007
106	root	1.131	- replaced _fd2fh with faster xs code.
107			- aio_close will now try to do "the right thing" and thus might
108			work sensibly for the very first time.
109
110	root	1.130	2.41 Mon Sep 24 21:28:21 CEST 2007
111	root	1.129	- after fork, invest some work to make sure that the poll_fileno
112			stays stable (by dup2'ing the new fd over the old one), to make
113			it easier for programs/libs that don't control their forking
114			behaviour and cannot recreate their watchers.
115
116	root	1.128	2.4 Sun Aug 5 18:44:22 CEST 2007
117	root	1.127	- add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
118			successfully demonstrated that you can block on futimes...).
119	root	1.124	- allow undef as fileoffset for aio_read/write and use read/write(2)
120			internally (useful for sockets or O_APPEND handles).
121	root	1.126	- allow undef for length in aio_write.
122			- negative dataoffsets work as expected now in aio_read/aio_write.
123	root	1.124	- use NV instead of UV for 32 bit perls and file offsets, as NVs
124	root	1.125	have a larger range then.
125	root	1.120	- shared code between BDB and IO::AIO.
126	root	1.127	- aio_busy was completely broken. now fixed.
127			- readahead emulation now returns something.
128	root	1.121	- correctly set errno to ENOSYS on unimplemented functions
129			(should never happen, though).
130	root	1.127	- large changes to make it partially compile and run on win32,
131			but win32 lacks too much functionality, and perl overrides way
132			too many functions with crashing versions.
133	root	1.120
134	root	1.119	2.33 Tue Jan 23 23:55:41 CET 2007
135			- fix install path (Andreas J. Koenig).
136
137	root	1.118	2.32 Mon Jan 22 16:56:23 CET 2007
138	root	1.114	- added aio_rmtree.
139	root	1.115	- wow, aio_mkdir was missing.
140	root	1.116	- aio_load did return undef on error, not -1.
141	root	1.117	- use prefixexp not prefix in autoconf.pm
142			(suggested by ... rt.cpan.org unreachable).
143	root	1.118	- avoid installing autoconf.pm.
144	root	1.114
145	root	1.113	2.31 Sat Jan 6 03:46:02 CET 2007
146	root	1.112	- added aio_load.
147
148	root	1.111	2.3 Sat Dec 23 05:48:07 CET 2006
149			- fix off-by-one bug in aio_read, causing memory corruption
150			or crashes.
151
152	root	1.110	2.21 Fri Dec 22 05:03:38 CET 2006
153	root	1.108	- minor doc updates.
154	root	1.107	- minor cleanups.
155			- IO::AIO::poll returns request count.
156	root	1.109	- undocumented and unfinished async-signal-reporting.
157	root	1.107
158	root	1.103	2.2 Tue Oct 31 00:31:00 CET 2006
159	root	1.100	- minor doc updates.
160	root	1.101	- added aio_readlink.
161			- properly zero-terminate aio_read buffer.
162			- fix aio_read/write with nonzero dataoffset.
163	root	1.104	- reduced size of aio request structure.
164	root	1.106	- better diagnostics when pathnames etc. are not byte-encoded;
165	root	1.105	do not leak request in that case, either.
166	root	1.94
167	root	1.99	2.1 Sun Oct 29 02:01:57 CET 2006
168	root	1.98	- INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
169			IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
170	root	1.95	- fix a bug in aio_move where it would fail everytime
171			it would have to copy files manually.
172	root	1.98	- doc updates.
173	root	1.94	- start threads only on (very low) demand.
174	root	1.97	- end superfluous threads automatically after 10s idling.
175	root	1.98	- add IO::AIO::max_idle to control this.
176	root	1.94	- some tuning applied to random places.
177	root	1.95	- add aio_mknod.
178	root	1.59
179	root	1.92	2.0 Thu Oct 26 18:27:58 CEST 2006
180	root	1.90	- minor incompatibility: max_outstanding semantics have changed.
181	root	1.86	- major rewrite, consider all functionality EXPERIMENTAL.
182	root	1.68	- aio requests can be cancelled.
183	root	1.81	- callbacks can be (re-)set later.
184	root	1.93	- aio requests can choose between 9 priorities.
185	root	1.83	- add aio_group: aio requests can be grouped
186			into composite requests.
187			- generator interface for groups.
188	root	1.89	- add IO::AIO::poll_some.
189	root	1.72	- major documentation improvements.
190			- very minor bugfixes.
191	root	1.76	- add aio_nop for dummy requests.
192	root	1.84	- add aio_busy mainly for benchmarking and debugging.
193	root	1.79	- use "fast" mutexes on linux.
194	root	1.80	- use dynamic (and larger) buffers instead of
195			putting them onto the stack.
196			- optimise x86 and amd64 a bit.
197			- better error checking when ENOMEM.
198	root	1.85	- hopefully fix mem and dirp leaks on fork.
199	root	1.92	- warn about broken perl malloc.
200	root	1.88	- compiles on cygwin (but pread is broken on cygwin
201			which is not detected by autoconf, so you have to
202			edit autoconf/config.h yourself to enable emulation).
203	root	1.68
204	root	1.67	1.8 Sat Jun 24 22:20:44 CEST 2006
205	root	1.66	- add and/or document aio_rename, aio_link, aio_symlink and aio_move.
206
207	root	1.65	1.73 Wed Mar 1 22:49:32 CET 2006
208			- codename "jost"
209			- AIX/Solaris(?) aren't being helpful again, hardcode a value
210			for NAME_MAX and drive with your eyes closed (reported by
211			wcooley@nakedape.cc).
212	root	1.63
213	root	1.62	1.72 Thu Feb 2 00:40:44 CET 2006
214	root	1.61	- another minor bug in aio_scandir, again, the callback was called
215			twice when the directory can't be stat'ed.
216
217	root	1.60	1.71 Mon Dec 26 20:20:03 CET 2005
218			- grr, another minor bug in aio_scandir, this time resulting
219			in a runtime error.
220
221	root	1.59	1.7 Mon Dec 26 19:29:48 CET 2005
222	root	1.58	- aio_scandir errornously called callback twice in some cases.
223	root	1.57	- added AnyEvent example.
224
225	root	1.55	1.61 Wed Sep 7 19:40:42 CEST 2005
226	root	1.54	- no longer include $Config{libs}, as distros include too much
227	root	1.56	garbage in there that is not installed on typical systems
228	root	1.54	(for example, debian links perl against -lgdbm and many more
229			libraries despite perl not needing it, slowing down startup and
230			wasting memory).
231
232	root	1.53	1.6 Tue Aug 30 17:44:44 CEST 2005
233			- added aio_readdir, aio_scandir.
234	root	1.51	- added aio_sendfile, including sendfile emulation when sendfile
235			isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
236			support is unavailable on my solaris 8 machine, but preliminary
237			code is there. What's lacking is configury stuff and testing...).
238	root	1.46
239	root	1.44	1.5 Sat Aug 20 02:32:19 CEST 2005
240	root	1.51	- create the aio threads on demand only (good after forking).
241	root	1.41	- somebody nagged about C89 compatibility, so this release should
242	root	1.42	be C89 compatible, but no guarantees for future ones.
243	root	1.43	- abort when the configure script fails.
244	root	1.41
245	root	1.40	1.4 Wed Aug 17 08:07:27 CEST 2005
246	root	1.93	- forgot to recreate the pipe after forking, this could cause
247	root	1.40	deadlocks.
248
249	root	1.39	1.3 Wed Aug 17 07:25:54 CEST 2005
250	root	1.33	- properly propagate exceptions from callbacks, instead of silently
251			eating them.
252	root	1.38	- use a different fork algorithm that avoids recursive callback
253			invocations and reduces fork latency in busy processes.
254	root	1.37	- fix a bug where the buffer scalar in aio_read got assigned the wrong
255			length after reading.
256			- fix a bug where the child would process some outstanding requests
257			from the parent.
258			- make a copy of the callback scalar, to avoid some very uncommon
259			(but valid) usages where the callback scalar changes.
260			- the callback was never freed in aio_read/aio_write.
261	root	1.38	- aio_read/aio_write will now set the readonly flag on the data
262			scalar for better error reporting.
263	root	1.33
264	root	1.32	1.2 Wed Aug 17 01:22:58 CEST 2005
265			- verified on cygwin, linux/amd64+ia32+alpha, solaris.
266	root	1.31	- use SvPVbyte for filenames now. You need to encode your strings to
267			the external filename encoding first.
268	root	1.32	- fix the bug where filehandles could leak (again).
269	root	1.31	- clarify freebsd situation: make it work and tell me how, or go away
270			with your underdocumented, broken and outdated OS.
271			- fork'ing should now be officially supported (where linux and
272			posix contradict each other, I followed posix).
273	root	1.32	- only call read() once per poll, not twice (speedup).
274			- new functions: aio_rmdir, aio_symlink.
275	root	1.31	- force callback arguments to be undef or a reference, for better
276			error catching.
277	root	1.1
278	root	1.29	1.1 Sun Aug 7 05:27:23 CEST 2005
279	root	1.25	- added configure script to detect availability of some calls.
280	root	1.27	(imperfect, as we cannot detect things like -lrt due to missing
281	root	1.23	feedback yet).
282	root	1.27	- emulate fdatasync via fsync, pread/pwrite via unsafe read/write
283			and readahead via manual reading on platforms lacking those.
284	root	1.19	- ported t/03_errors.t+framework by Brad Fitzpatrick
285			from Linux::AIO.
286	root	1.18	- removed XOPEN_SOURCE because stupid solaris 9 doesn't
287			compile with it enabled. Probably breaks others. Oh well.
288	root	1.24	- try to be more careful with errno on non-threaded perls.
289	root	1.26	- cygwins perl insisted on a matching open mode when morphing
290			the fd to an fh.
291	root	1.28	- convert sv's to "byte" encoding in aio_read/aio_write. Might
292			do that for pathnames, too, in the future, so make sure you
293			properly encode your pathnames.
294	root	1.18
295	root	1.17	1.0 Fri Jul 22 10:43:30 CEST 2005
296			- aio_open did not reliably deliver (open) filehandles.
297	root	1.16	- all aio_*-functions keep a reference to the filehandle so
298			it doesn't go away while the aio requests is working on it.
299			- disable warnings in AIO.pm.
300
301	root	1.15	0.9 Wed Jul 20 23:55:04 CEST 2005
302			- allow recursive calls to poll_cb, use less locking calls, too.
303			- fix the Gtk2-example in the SYNOPSIS.
304	root	1.14	- use pread/pwrite not pread64/pwrite64. this was simply a leftover
305			from Linux::AIO.
306			(found by compiling on cygwin. Unfortunately, cygwin declares but
307			does not implement pread/pwrite).
308			- only include <sys/syscall.h> on linux.
309
310	root	1.13	0.5 Tue Jul 12 13:03:09 CEST 2005
311	root	1.12	- removed #include <endian.h>, it's not portable, and we don't
312			need it anyway.
313			- link against -lrt, as it might contain goodies such as fdatasync,
314			and often aio_read, which we do not use yet, but it shouldn't hurt.
315
316	root	1.11	0.4 Mon Jul 11 05:28:25 CEST 2005
317	root	1.9	- added IO::AIO::flush, IO::AIO::poll.
318	root	1.10	- make callback argument optional for all calls.
319	root	1.8
320	root	1.7	0.3 Mon Jul 11 01:42:37 CEST 2005
321	root	1.5	- restructured manpage.
322	root	1.7	- added SYNOPSIS with examples for Event, Glib, Tk.
323			- remove explicit context support so I don't have to maintain
324			it for threaded perls (i.e. it should work now :).
325	root	1.5
326	root	1.4	0.2 Sun Jul 10 22:57:12 CEST 2005
327	root	1.2	- return immediately from poll_wait if nreqs==0.
328			- get rid of the request pipe and use faster thread-thread
329	root	1.3	communications for most requests and responses.
330	root	1.2
331	root	1.1	0.1
332			- cloned from Linux::AIO, which is very similar.
333