[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

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