[ViewVC] Annotation of: cvs/IO-AIO/Changes

Revision history for IO::AIO

TODO: better autoconf.pm that can return LIBS etc.
TODO: aio_cptree/mvtree
TODO: reduce condvar fairness: schedule hot-cache-threads first?
TODO: splice/tee/vmsplice? (http://kerneltrap.org/node/6505 http://lwn.net/Articles/178199/)
TODO: aio_fcntl, at least for file-locking

        - avoid some degenerate sorting cases on systems without d_ino,
          or when the dentries are mostly sorted by inode already (common
          with freshly unpacked tarfiles for example).
        - correctly sort dirs by inodes only if we have perfect type
          knowledge and DIRS_FIRST is used.
        - speed up directory entry sorting further by some 20%.

3.23 Sat Jun 13 16:57:58 CEST 2009
        - fix off-by-one bug in aio_readdir that was introduced in the
          rushed 3.22 release.

3.22 Sat Jun 13 15:32:40 CEST 2009
        - speed up readdirx sort algorithm slightly.
        - bin/treescan was missing from distro tarball.

3.21 Fri Jun 12 18:45:53 CEST 2009
        - new options --dirs and --files for treescan.
        - install bin/treescan by default.
        - (libeio) aio_readdir can now be cancelled while executing.
        - fix a printf format string for 64 bit systems (could lead
          to problems on big endian 64 bit systems).
        - do not use qsort() but our own algorithm: glibc initialises
          the whole locale and I/O subsystem inside qsort, causing
          a stack overflow on 32 bit machines. The new sort uses much less
          stack and is more than twice as fast in typical situations.

3.2  Sun Jun  7 20:30:05 CEST 2009
        - (libeio) pwrite emulation was even more flawed than intended and did
          not restore the file offset.
        - add aio_readdirx, which can return inode and filetype and sort
          the names in various ways.
        - unfortunately, utime, chmod, chown on an open file that has just
          been written can easily block, which caused aio_copy to block the
          process. no more!
        - no longer rely on dst path in aio_copy when futime is available.

3.19 Tue Apr 21 22:05:21 CEST 2009
        - more perl 5.10 workarounds for aio_read and write.
        - aio_write no longer modifies the sv (if possible).
        - aio_read now works correctly with magic values.

3.18 Sun Apr 19 21:17:32 CEST 2009
        - better diagnostics when some aio_* functions get passed an illegal fh.
        - try to avoid crashes due to incompatible 5.10 API changes. grmbl.

3.17 Thu Nov 20 08:45:36 CET 2008
        - (libeio) added aio_sync_file_range (untested).
        - add aio_busy to @IO::AIO::AIO_REQ.

3.16 Wed Oct 22 18:28:01 CEST 2008
        - use SvREFCNT_inc instead of SvREFCNT_inc_NN in a non-speed critical
          part to improve portability to perl 5.8 (reported by szymon).

3.15 Mon Oct 13 00:39:55 CEST 2008
        - automatic removal of feeders was broken.
        - (libeio) use a more robust method to detect whether a feeder
          has added something to the group or not.

3.1  Thu Oct  2 13:34:40 CEST 2008
        - pre-deref the passed callback object, for increased speed
          and decreased memory usage.
        - call on_next_submit callback even for aio_group - impact unknown,
          but seems more correct.
        - $req->cb now returns the original callback.
        - (libeio) pass EIO_GROUP/aio_group requests through the queue without
          requiring a thread switch.
        - (libeio) status code of aio_futime and aio_utime was always passed 0.
        - do some other µ-optimisations.

3.07 Sat Aug  2 16:06:13 CEST 2008
        - do not include LIBS in autoconf tests.

3.06 Tue Jul 15 12:41:32 CEST 2008
        - move preadwritelock definition before it's first reference,
          to make it compile again on broken platforms (they still exist)
          or badly cofngiured perls (redhat...), reported by Rob Bloodgood.

3.05 Thu Jun 19 23:23:52 CEST 2008
        - work around perl overriding readdir etc. with thread-unsafe
          (sic!) versions.

3.04 Wed Jun 18 01:35:38 CEST 2008
        - (libeio) fix eio_mknod, which confused it's arguments.
        - (libeio) do not use readdir_r, as Ulrich Drepper pointed out that this
          is stupid.
        - (libeio) fix eio__readahead prototype, patch by Jost Krieger.
        - (libeio) fix a bug that could potentially cause IO::AIO
          not to get initialised properly.

3.03 Thu May 29 05:33:30 CEST 2008
        - (libeio) correctly call pthread_attr_destroy ().
        - (libeio) work around broken bsd headers once more.
        - reduce shared library size again by not including wrappers.
        - max_outstanding could cause poll to enter a busy-waiting loop.
        - document the new IO::AIO::poll_cb result value.

3.02 Mon May 12 02:32:02 CEST 2008
        - fix a memory leak on aio_readlink.
        - bring back working fchmod.
        - nop and busy now set result to 0.
        - set errno to ENOMEM when allocation fails.

3.01 Sun May 11 03:07:03 CEST 2008
        - (libeio) make it compile on systems without readahead or readdir_r.
        - (libeio) improve configure check for readahead availability.
        - do not try to link against -lrt.
        - use a separate configure script for IO::AIO (not the libeio one).

3.0  Sun May 11 00:57:14 CEST 2008
        - added bin/treescan to the distribution.
        - switched to using libeio.
        - LOTS OF INCOMPATIBLE CHANGES:
          - remove signal functionality, it is not worth the effort.
          - max_outstanding no longer returns the previous number of requests.
          - poll_cb no longer returns number of requests.

2.62 Sat Apr 26 13:59:33 CEST 2008
        - port to solaris perls configured for old posix
          (analysed by Jost Krieger).
        - keep a reference to the perl filehandle object in aio_close,
          so it doesn't get closed prematurely, leading to ugly races.

2.61 Wed Apr 16 18:45:02 CEST 2008
        - fix treescan output duplication and improve output ordering.
          also display files given on the commandline.
        - use a different algorithm for aio_close that is faster
          and probably has even lower chances of blocking.
        - do our own stack memory management for threads - linux
          allocates outrageous amounts of VM (not so bad unless you
          use mlockall...), which severely limits the number of threads
          on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
          and 4096 * sizeof (long) (usually this is 16..64k).

2.6  Sun Mar 30 08:28:11 CEST 2008
        - added aio_sync.
        - added aio_pathsync.
        - fix prototypes of (void) functions.

2.51 Sat Oct  6 16:04:54 CEST 2007
        - perlio isn't generally threadsafe, so aio_close could not work reliably.
          aio_close now tries a safe hack that might not be that asynchronous
          (see the manpage for details).
        - discard callback return values as to not grow the stack endlessly
          when poll_cb handles many requests without returning.
        - minor code cleanups.

2.5  Thu Oct  4 14:49:08 CEST 2007
        - replaced _fd2fh with faster xs code.
        - aio_close will now try to do "the right thing" and thus might
          work sensibly for the very first time.

2.41 Mon Sep 24 21:28:21 CEST 2007
        - after fork, invest some work to make sure that the poll_fileno
          stays stable (by dup2'ing the new fd over the old one), to make
          it easier for programs/libs that don't control their forking
          behaviour and cannot recreate their watchers.

2.4  Sun Aug  5 18:44:22 CEST 2007
        - add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
          successfully demonstrated that you can block on futimes...).
        - allow undef as fileoffset for aio_read/write and use read/write(2)
          internally (useful for sockets or O_APPEND handles).
        - allow undef for length in aio_write.
        - negative dataoffsets work as expected now in aio_read/aio_write.
        - use NV instead of UV for 32 bit perls and file offsets, as NVs
          have a larger range then.
        - shared code between BDB and IO::AIO.
        - aio_busy was completely broken. now fixed.
        - readahead emulation now returns something.
        - correctly set errno to ENOSYS on unimplemented functions
          (should never happen, though).
        - large changes to make it partially compile and run on win32,
          but win32 lacks too much functionality, and perl overrides way
          too many functions with crashing versions.

2.33 Tue Jan 23 23:55:41 CET 2007
        - fix install path (Andreas J. Koenig).

2.32 Mon Jan 22 16:56:23 CET 2007
        - added aio_rmtree.
        - wow, aio_mkdir was missing.
        - aio_load did return undef on error, not -1.
        - use prefixexp not prefix in autoconf.pm
          (suggested by ... rt.cpan.org unreachable).
        - avoid installing autoconf.pm.

2.31 Sat Jan  6 03:46:02 CET 2007
        - added aio_load.

2.3  Sat Dec 23 05:48:07 CET 2006
        - fix off-by-one bug in aio_read, causing memory corruption
          or crashes.

2.21  Fri Dec 22 05:03:38 CET 2006
        - minor doc updates.
        - minor cleanups.
        - IO::AIO::poll returns request count.
        - undocumented and unfinished async-signal-reporting.

2.2  Tue Oct 31 00:31:00 CET 2006
        - minor doc updates.
        - added aio_readlink.
        - properly zero-terminate aio_read buffer.
        - fix aio_read/write with nonzero dataoffset.
        - reduced size of aio request structure.
        - better diagnostics when pathnames etc. are not byte-encoded;
          do not leak request in that case, either.

2.1  Sun Oct 29 02:01:57 CET 2006
        - INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
          IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
        - fix a bug in aio_move where it would fail everytime
          it would have to copy files manually.
        - doc updates.
        - start threads only on (very low) demand.
        - end superfluous threads automatically after 10s idling.
        - add IO::AIO::max_idle to control this.
        - some tuning applied to random places.
        - add aio_mknod.

2.0  Thu Oct 26 18:27:58 CEST 2006
        - minor incompatibility: max_outstanding semantics have changed.
        - major rewrite, consider all functionality EXPERIMENTAL.
        - aio requests can be cancelled.
        - callbacks can be (re-)set later.
        - aio requests can choose between 9 priorities.
        - add aio_group: aio requests can be grouped
          into composite requests.
        - generator interface for groups.
        - add IO::AIO::poll_some.
        - major documentation improvements.
        - very minor bugfixes.
        - add aio_nop for dummy requests.
        - add aio_busy mainly for benchmarking and debugging.
        - use "fast" mutexes on linux.
        - use dynamic (and larger) buffers instead of
          putting them onto the stack.
        - optimise x86 and amd64 a bit.
        - better error checking when ENOMEM.
        - hopefully fix mem and dirp leaks on fork.
        - warn about broken perl malloc.
        - compiles on cygwin (but pread is broken on cygwin
          which is not detected by autoconf, so you have to
          edit autoconf/config.h yourself to enable emulation).

1.8  Sat Jun 24 22:20:44 CEST 2006
        - add and/or document aio_rename, aio_link, aio_symlink and aio_move.

1.73 Wed Mar  1 22:49:32 CET 2006
        - codename "jost"
        - AIX/Solaris(?) aren't being helpful again, hardcode a value
          for NAME_MAX and drive with your eyes closed (reported by
          wcooley@nakedape.cc).

1.72 Thu Feb  2 00:40:44 CET 2006
        - another minor bug in aio_scandir, again, the callback was called
          twice when the directory can't be stat'ed.

1.71 Mon Dec 26 20:20:03 CET 2005
        - grr, another minor bug in aio_scandir, this time resulting
          in a runtime error.

1.7  Mon Dec 26 19:29:48 CET 2005
        - aio_scandir errornously called callback twice in some cases.
        - added AnyEvent example.

1.61 Wed Sep  7 19:40:42 CEST 2005
        - no longer include $Config{libs}, as distros include too much
          garbage in there that is not installed on typical systems
          (for example, debian links perl against -lgdbm and many more
          libraries despite perl not needing it, slowing down startup and
          wasting memory).

1.6  Tue Aug 30 17:44:44 CEST 2005
        - added aio_readdir, aio_scandir.
        - added aio_sendfile, including sendfile emulation when sendfile
          isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
          support is unavailable on my solaris 8 machine, but preliminary
          code is there. What's lacking is configury stuff and testing...).

1.5  Sat Aug 20 02:32:19 CEST 2005
        - create the aio threads on demand only (good after forking).
        - somebody nagged about C89 compatibility, so this release should
          be C89 compatible, but no guarantees for future ones.
        - abort when the configure script fails.

1.4  Wed Aug 17 08:07:27 CEST 2005
        - forgot to recreate the pipe after forking, this could cause
          deadlocks.

1.3  Wed Aug 17 07:25:54 CEST 2005
        - properly propagate exceptions from callbacks, instead of silently
          eating them.
        - use a different fork algorithm that avoids recursive callback
          invocations and reduces fork latency in busy processes.
        - fix a bug where the buffer scalar in aio_read got assigned the wrong
          length after reading.
        - fix a bug where the child would process some outstanding requests
          from the parent.
        - make a copy of the callback scalar, to avoid some very uncommon
          (but valid) usages where the callback scalar changes.
        - the callback was never freed in aio_read/aio_write.
        - aio_read/aio_write will now set the readonly flag on the data
          scalar for better error reporting.

1.2  Wed Aug 17 01:22:58 CEST 2005
        - verified on cygwin, linux/amd64+ia32+alpha, solaris.
        - use SvPVbyte for filenames now. You *need* to encode your strings to
          the external filename encoding first.
        - fix the bug where filehandles could leak (again).
        - clarify freebsd situation: make it work and tell me how, or go away
          with your underdocumented, broken and outdated OS.
        - fork'ing should now be officially supported (where linux and
          posix contradict each other, I followed posix).
        - only call read() once per poll, not twice (speedup).
        - new functions: aio_rmdir, aio_symlink.
        - force callback arguments to be undef or a reference, for better
          error catching.

1.1  Sun Aug  7 05:27:23 CEST 2005
        - added configure script to detect availability of some calls.
          (imperfect, as we cannot detect things like -lrt due to missing
          feedback yet).
        - emulate fdatasync via fsync, pread/pwrite via unsafe read/write
          and readahead via manual reading on platforms lacking those.
        - ported t/03_errors.t+framework by Brad Fitzpatrick
          from Linux::AIO.
        - removed XOPEN_SOURCE because stupid solaris 9 doesn't
          compile with it enabled. Probably breaks others. Oh well.
        - try to be more careful with errno on non-threaded perls.
        - cygwins perl insisted on a matching open mode when morphing
          the fd to an fh.
        - convert sv's to "byte" encoding in aio_read/aio_write. Might
          do that for pathnames, too, in the future, so make sure you
          properly encode your pathnames.

1.0  Fri Jul 22 10:43:30 CEST 2005
        - aio_open did not reliably deliver (open) filehandles.
        - all aio_*-functions keep a reference to the filehandle so
          it doesn't go away while the aio requests is working on it.
        - disable warnings in AIO.pm.

0.9  Wed Jul 20 23:55:04 CEST 2005
        - allow recursive calls to poll_cb, use less locking calls, too.
        - fix the Gtk2-example in the SYNOPSIS.
        - use pread/pwrite not pread64/pwrite64. this was simply a leftover
          from Linux::AIO.
          (found by compiling on cygwin. Unfortunately, cygwin declares but
          does not implement pread/pwrite).
        - only include <sys/syscall.h> on linux.

0.5  Tue Jul 12 13:03:09 CEST 2005
        - removed #include <endian.h>, it's not portable, and we don't
          need it anyway.
        - link against -lrt, as it might contain goodies such as fdatasync,
          and often aio_read, which we do not use yet, but it shouldn't hurt.

0.4  Mon Jul 11 05:28:25 CEST 2005
        - added IO::AIO::flush, IO::AIO::poll.
        - make callback argument optional for all calls.

0.3  Mon Jul 11 01:42:37 CEST 2005
        - restructured manpage.
        - added SYNOPSIS with examples for Event, Glib, Tk.
        - remove explicit context support so I don't have to maintain
          it for threaded perls (i.e. it should work now :).

0.2  Sun Jul 10 22:57:12 CEST 2005
        - return immediately from poll_wait if nreqs==0.
        - get rid of the request pipe and use faster thread-thread
          communications for most requests and responses.

0.1
        - cloned from Linux::AIO, which is very similar.

Revision:	1.194
Committed:	Sun Jun 14 20:36:59 2009 UTC (14 years, 11 months ago) by root
Branch:	MAIN
Changes since 1.193:	+7 -0 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.31	Revision history for IO::AIO
2	root	1.30
3	root	1.59	TODO: better autoconf.pm that can return LIBS etc.
4	root	1.114	TODO: aio_cptree/mvtree
5	root	1.106	TODO: reduce condvar fairness: schedule hot-cache-threads first?
6	root	1.176	TODO: splice/tee/vmsplice? (http://kerneltrap.org/node/6505 http://lwn.net/Articles/178199/)
7	root	1.136	TODO: aio_fcntl, at least for file-locking
8	root	1.100
9	root	1.194	- avoid some degenerate sorting cases on systems without d_ino,
10			or when the dentries are mostly sorted by inode already (common
11			with freshly unpacked tarfiles for example).
12			- correctly sort dirs by inodes only if we have perfect type
13			knowledge and DIRS_FIRST is used.
14			- speed up directory entry sorting further by some 20%.
15
16	root	1.193	3.23 Sat Jun 13 16:57:58 CEST 2009
17			- fix off-by-one bug in aio_readdir that was introduced in the
18			rushed 3.22 release.
19
20	root	1.192	3.22 Sat Jun 13 15:32:40 CEST 2009
21	root	1.191	- speed up readdirx sort algorithm slightly.
22	root	1.192	- bin/treescan was missing from distro tarball.
23	root	1.191
24	root	1.190	3.21 Fri Jun 12 18:45:53 CEST 2009
25	root	1.187	- new options --dirs and --files for treescan.
26	root	1.188	- install bin/treescan by default.
27	root	1.189	- (libeio) aio_readdir can now be cancelled while executing.
28	root	1.190	- fix a printf format string for 64 bit systems (could lead
29			to problems on big endian 64 bit systems).
30			- do not use qsort() but our own algorithm: glibc initialises
31			the whole locale and I/O subsystem inside qsort, causing
32			a stack overflow on 32 bit machines. The new sort uses much less
33			stack and is more than twice as fast in typical situations.
34	root	1.187
35	root	1.186	3.2 Sun Jun 7 20:30:05 CEST 2009
36	root	1.182	- (libeio) pwrite emulation was even more flawed than intended and did
37			not restore the file offset.
38	root	1.183	- add aio_readdirx, which can return inode and filetype and sort
39			the names in various ways.
40	root	1.182	- unfortunately, utime, chmod, chown on an open file that has just
41			been written can easily block, which caused aio_copy to block the
42			process. no more!
43			- no longer rely on dst path in aio_copy when futime is available.
44
45	root	1.181	3.19 Tue Apr 21 22:05:21 CEST 2009
46			- more perl 5.10 workarounds for aio_read and write.
47			- aio_write no longer modifies the sv (if possible).
48			- aio_read now works correctly with magic values.
49
50	root	1.180	3.18 Sun Apr 19 21:17:32 CEST 2009
51	root	1.179	- better diagnostics when some aio_* functions get passed an illegal fh.
52	root	1.180	- try to avoid crashes due to incompatible 5.10 API changes. grmbl.
53	root	1.178
54	root	1.177	3.17 Thu Nov 20 08:45:36 CET 2008
55	root	1.176	- (libeio) added aio_sync_file_range (untested).
56	root	1.177	- add aio_busy to @IO::AIO::AIO_REQ.
57	root	1.175
58	root	1.174	3.16 Wed Oct 22 18:28:01 CEST 2008
59	root	1.173	- use SvREFCNT_inc instead of SvREFCNT_inc_NN in a non-speed critical
60			part to improve portability to perl 5.8 (reported by szymon).
61
62	root	1.172	3.15 Mon Oct 13 00:39:55 CEST 2008
63	root	1.171	- automatic removal of feeders was broken.
64			- (libeio) use a more robust method to detect whether a feeder
65			has added something to the group or not.
66
67	root	1.170	3.1 Thu Oct 2 13:34:40 CEST 2008
68	root	1.168	- pre-deref the passed callback object, for increased speed
69			and decreased memory usage.
70	root	1.167	- call on_next_submit callback even for aio_group - impact unknown,
71	root	1.166	but seems more correct.
72	root	1.168	- $req->cb now returns the original callback.
73	root	1.166	- (libeio) pass EIO_GROUP/aio_group requests through the queue without
74			requiring a thread switch.
75	root	1.169	- (libeio) status code of aio_futime and aio_utime was always passed 0.
76	root	1.166	- do some other µ-optimisations.
77
78	root	1.165	3.07 Sat Aug 2 16:06:13 CEST 2008
79			- do not include LIBS in autoconf tests.
80
81	root	1.164	3.06 Tue Jul 15 12:41:32 CEST 2008
82	root	1.162	- move preadwritelock definition before it's first reference,
83	root	1.164	to make it compile again on broken platforms (they still exist)
84			or badly cofngiured perls (redhat...), reported by Rob Bloodgood.
85	root	1.162
86	root	1.161	3.05 Thu Jun 19 23:23:52 CEST 2008
87	root	1.160	- work around perl overriding readdir etc. with thread-unsafe
88	root	1.161	(sic!) versions.
89	root	1.160
90	root	1.159	3.04 Wed Jun 18 01:35:38 CEST 2008
91			- (libeio) fix eio_mknod, which confused it's arguments.
92	root	1.158	- (libeio) do not use readdir_r, as Ulrich Drepper pointed out that this
93			is stupid.
94	root	1.159	- (libeio) fix eio__readahead prototype, patch by Jost Krieger.
95			- (libeio) fix a bug that could potentially cause IO::AIO
96			not to get initialised properly.
97	root	1.158
98	root	1.157	3.03 Thu May 29 05:33:30 CEST 2008
99	root	1.153	- (libeio) correctly call pthread_attr_destroy ().
100	root	1.155	- (libeio) work around broken bsd headers once more.
101	root	1.154	- reduce shared library size again by not including wrappers.
102	root	1.156	- max_outstanding could cause poll to enter a busy-waiting loop.
103			- document the new IO::AIO::poll_cb result value.
104	root	1.153
105	root	1.152	3.02 Mon May 12 02:32:02 CEST 2008
106	root	1.150	- fix a memory leak on aio_readlink.
107			- bring back working fchmod.
108	root	1.151	- nop and busy now set result to 0.
109			- set errno to ENOMEM when allocation fails.
110	root	1.150
111	root	1.149	3.01 Sun May 11 03:07:03 CEST 2008
112			- (libeio) make it compile on systems without readahead or readdir_r.
113	root	1.148	- (libeio) improve configure check for readahead availability.
114			- do not try to link against -lrt.
115	root	1.147	- use a separate configure script for IO::AIO (not the libeio one).
116
117	root	1.146	3.0 Sun May 11 00:57:14 CEST 2008
118	root	1.145	- added bin/treescan to the distribution.
119			- switched to using libeio.
120			- LOTS OF INCOMPATIBLE CHANGES:
121			- remove signal functionality, it is not worth the effort.
122			- max_outstanding no longer returns the previous number of requests.
123			- poll_cb no longer returns number of requests.
124	root	1.143
125	root	1.142	2.62 Sat Apr 26 13:59:33 CEST 2008
126	root	1.141	- port to solaris perls configured for old posix
127			(analysed by Jost Krieger).
128	root	1.142	- keep a reference to the perl filehandle object in aio_close,
129			so it doesn't get closed prematurely, leading to ugly races.
130	root	1.141
131	root	1.140	2.61 Wed Apr 16 18:45:02 CEST 2008
132	root	1.137	- fix treescan output duplication and improve output ordering.
133			also display files given on the commandline.
134	root	1.140	- use a different algorithm for aio_close that is faster
135			and probably has even lower chances of blocking.
136	root	1.138	- do our own stack memory management for threads - linux
137			allocates outrageous amounts of VM (not so bad unless you
138			use mlockall...), which severely limits the number of threads
139	root	1.139	on 32-bit arches: stack size is the larger of PTHREAD_STACK_MIN
140			and 4096 * sizeof (long) (usually this is 16..64k).
141	root	1.137
142	root	1.136	2.6 Sun Mar 30 08:28:11 CEST 2008
143	root	1.134	- added aio_sync.
144	root	1.135	- added aio_pathsync.
145	root	1.136	- fix prototypes of (void) functions.
146	root	1.134
147	root	1.133	2.51 Sat Oct 6 16:04:54 CEST 2007
148			- perlio isn't generally threadsafe, so aio_close could not work reliably.
149			aio_close now tries a safe hack that might not be that asynchronous
150			(see the manpage for details).
151			- discard callback return values as to not grow the stack endlessly
152			when poll_cb handles many requests without returning.
153			- minor code cleanups.
154
155	root	1.132	2.5 Thu Oct 4 14:49:08 CEST 2007
156	root	1.131	- replaced _fd2fh with faster xs code.
157			- aio_close will now try to do "the right thing" and thus might
158			work sensibly for the very first time.
159
160	root	1.130	2.41 Mon Sep 24 21:28:21 CEST 2007
161	root	1.129	- after fork, invest some work to make sure that the poll_fileno
162			stays stable (by dup2'ing the new fd over the old one), to make
163			it easier for programs/libs that don't control their forking
164			behaviour and cannot recreate their watchers.
165
166	root	1.128	2.4 Sun Aug 5 18:44:22 CEST 2007
167	root	1.127	- add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
168			successfully demonstrated that you can block on futimes...).
169	root	1.124	- allow undef as fileoffset for aio_read/write and use read/write(2)
170			internally (useful for sockets or O_APPEND handles).
171	root	1.126	- allow undef for length in aio_write.
172			- negative dataoffsets work as expected now in aio_read/aio_write.
173	root	1.124	- use NV instead of UV for 32 bit perls and file offsets, as NVs
174	root	1.125	have a larger range then.
175	root	1.120	- shared code between BDB and IO::AIO.
176	root	1.127	- aio_busy was completely broken. now fixed.
177			- readahead emulation now returns something.
178	root	1.121	- correctly set errno to ENOSYS on unimplemented functions
179			(should never happen, though).
180	root	1.127	- large changes to make it partially compile and run on win32,
181			but win32 lacks too much functionality, and perl overrides way
182			too many functions with crashing versions.
183	root	1.120
184	root	1.119	2.33 Tue Jan 23 23:55:41 CET 2007
185			- fix install path (Andreas J. Koenig).
186
187	root	1.118	2.32 Mon Jan 22 16:56:23 CET 2007
188	root	1.114	- added aio_rmtree.
189	root	1.115	- wow, aio_mkdir was missing.
190	root	1.116	- aio_load did return undef on error, not -1.
191	root	1.117	- use prefixexp not prefix in autoconf.pm
192			(suggested by ... rt.cpan.org unreachable).
193	root	1.118	- avoid installing autoconf.pm.
194	root	1.114
195	root	1.113	2.31 Sat Jan 6 03:46:02 CET 2007
196	root	1.112	- added aio_load.
197
198	root	1.111	2.3 Sat Dec 23 05:48:07 CET 2006
199			- fix off-by-one bug in aio_read, causing memory corruption
200			or crashes.
201
202	root	1.110	2.21 Fri Dec 22 05:03:38 CET 2006
203	root	1.108	- minor doc updates.
204	root	1.107	- minor cleanups.
205			- IO::AIO::poll returns request count.
206	root	1.109	- undocumented and unfinished async-signal-reporting.
207	root	1.107
208	root	1.103	2.2 Tue Oct 31 00:31:00 CET 2006
209	root	1.100	- minor doc updates.
210	root	1.101	- added aio_readlink.
211			- properly zero-terminate aio_read buffer.
212			- fix aio_read/write with nonzero dataoffset.
213	root	1.104	- reduced size of aio request structure.
214	root	1.106	- better diagnostics when pathnames etc. are not byte-encoded;
215	root	1.105	do not leak request in that case, either.
216	root	1.94
217	root	1.99	2.1 Sun Oct 29 02:01:57 CET 2006
218	root	1.98	- INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
219			IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
220	root	1.95	- fix a bug in aio_move where it would fail everytime
221			it would have to copy files manually.
222	root	1.98	- doc updates.
223	root	1.94	- start threads only on (very low) demand.
224	root	1.97	- end superfluous threads automatically after 10s idling.
225	root	1.98	- add IO::AIO::max_idle to control this.
226	root	1.94	- some tuning applied to random places.
227	root	1.95	- add aio_mknod.
228	root	1.59
229	root	1.92	2.0 Thu Oct 26 18:27:58 CEST 2006
230	root	1.90	- minor incompatibility: max_outstanding semantics have changed.
231	root	1.86	- major rewrite, consider all functionality EXPERIMENTAL.
232	root	1.68	- aio requests can be cancelled.
233	root	1.81	- callbacks can be (re-)set later.
234	root	1.93	- aio requests can choose between 9 priorities.
235	root	1.83	- add aio_group: aio requests can be grouped
236			into composite requests.
237			- generator interface for groups.
238	root	1.89	- add IO::AIO::poll_some.
239	root	1.72	- major documentation improvements.
240			- very minor bugfixes.
241	root	1.76	- add aio_nop for dummy requests.
242	root	1.84	- add aio_busy mainly for benchmarking and debugging.
243	root	1.79	- use "fast" mutexes on linux.
244	root	1.80	- use dynamic (and larger) buffers instead of
245			putting them onto the stack.
246			- optimise x86 and amd64 a bit.
247			- better error checking when ENOMEM.
248	root	1.85	- hopefully fix mem and dirp leaks on fork.
249	root	1.92	- warn about broken perl malloc.
250	root	1.88	- compiles on cygwin (but pread is broken on cygwin
251			which is not detected by autoconf, so you have to
252			edit autoconf/config.h yourself to enable emulation).
253	root	1.68
254	root	1.67	1.8 Sat Jun 24 22:20:44 CEST 2006
255	root	1.66	- add and/or document aio_rename, aio_link, aio_symlink and aio_move.
256
257	root	1.65	1.73 Wed Mar 1 22:49:32 CET 2006
258			- codename "jost"
259			- AIX/Solaris(?) aren't being helpful again, hardcode a value
260			for NAME_MAX and drive with your eyes closed (reported by
261			wcooley@nakedape.cc).
262	root	1.63
263	root	1.62	1.72 Thu Feb 2 00:40:44 CET 2006
264	root	1.61	- another minor bug in aio_scandir, again, the callback was called
265			twice when the directory can't be stat'ed.
266
267	root	1.60	1.71 Mon Dec 26 20:20:03 CET 2005
268			- grr, another minor bug in aio_scandir, this time resulting
269			in a runtime error.
270
271	root	1.59	1.7 Mon Dec 26 19:29:48 CET 2005
272	root	1.58	- aio_scandir errornously called callback twice in some cases.
273	root	1.57	- added AnyEvent example.
274
275	root	1.55	1.61 Wed Sep 7 19:40:42 CEST 2005
276	root	1.54	- no longer include $Config{libs}, as distros include too much
277	root	1.56	garbage in there that is not installed on typical systems
278	root	1.54	(for example, debian links perl against -lgdbm and many more
279			libraries despite perl not needing it, slowing down startup and
280			wasting memory).
281
282	root	1.53	1.6 Tue Aug 30 17:44:44 CEST 2005
283			- added aio_readdir, aio_scandir.
284	root	1.51	- added aio_sendfile, including sendfile emulation when sendfile
285			isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
286			support is unavailable on my solaris 8 machine, but preliminary
287			code is there. What's lacking is configury stuff and testing...).
288	root	1.46
289	root	1.44	1.5 Sat Aug 20 02:32:19 CEST 2005
290	root	1.51	- create the aio threads on demand only (good after forking).
291	root	1.41	- somebody nagged about C89 compatibility, so this release should
292	root	1.42	be C89 compatible, but no guarantees for future ones.
293	root	1.43	- abort when the configure script fails.
294	root	1.41
295	root	1.40	1.4 Wed Aug 17 08:07:27 CEST 2005
296	root	1.93	- forgot to recreate the pipe after forking, this could cause
297	root	1.40	deadlocks.
298
299	root	1.39	1.3 Wed Aug 17 07:25:54 CEST 2005
300	root	1.33	- properly propagate exceptions from callbacks, instead of silently
301			eating them.
302	root	1.38	- use a different fork algorithm that avoids recursive callback
303			invocations and reduces fork latency in busy processes.
304	root	1.37	- fix a bug where the buffer scalar in aio_read got assigned the wrong
305			length after reading.
306			- fix a bug where the child would process some outstanding requests
307			from the parent.
308			- make a copy of the callback scalar, to avoid some very uncommon
309			(but valid) usages where the callback scalar changes.
310			- the callback was never freed in aio_read/aio_write.
311	root	1.38	- aio_read/aio_write will now set the readonly flag on the data
312			scalar for better error reporting.
313	root	1.33
314	root	1.32	1.2 Wed Aug 17 01:22:58 CEST 2005
315			- verified on cygwin, linux/amd64+ia32+alpha, solaris.
316	root	1.31	- use SvPVbyte for filenames now. You need to encode your strings to
317			the external filename encoding first.
318	root	1.32	- fix the bug where filehandles could leak (again).
319	root	1.31	- clarify freebsd situation: make it work and tell me how, or go away
320			with your underdocumented, broken and outdated OS.
321			- fork'ing should now be officially supported (where linux and
322			posix contradict each other, I followed posix).
323	root	1.32	- only call read() once per poll, not twice (speedup).
324			- new functions: aio_rmdir, aio_symlink.
325	root	1.31	- force callback arguments to be undef or a reference, for better
326			error catching.
327	root	1.1
328	root	1.29	1.1 Sun Aug 7 05:27:23 CEST 2005
329	root	1.25	- added configure script to detect availability of some calls.
330	root	1.27	(imperfect, as we cannot detect things like -lrt due to missing
331	root	1.23	feedback yet).
332	root	1.27	- emulate fdatasync via fsync, pread/pwrite via unsafe read/write
333			and readahead via manual reading on platforms lacking those.
334	root	1.19	- ported t/03_errors.t+framework by Brad Fitzpatrick
335			from Linux::AIO.
336	root	1.18	- removed XOPEN_SOURCE because stupid solaris 9 doesn't
337			compile with it enabled. Probably breaks others. Oh well.
338	root	1.24	- try to be more careful with errno on non-threaded perls.
339	root	1.26	- cygwins perl insisted on a matching open mode when morphing
340			the fd to an fh.
341	root	1.28	- convert sv's to "byte" encoding in aio_read/aio_write. Might
342			do that for pathnames, too, in the future, so make sure you
343			properly encode your pathnames.
344	root	1.18
345	root	1.17	1.0 Fri Jul 22 10:43:30 CEST 2005
346			- aio_open did not reliably deliver (open) filehandles.
347	root	1.16	- all aio_*-functions keep a reference to the filehandle so
348			it doesn't go away while the aio requests is working on it.
349			- disable warnings in AIO.pm.
350
351	root	1.15	0.9 Wed Jul 20 23:55:04 CEST 2005
352			- allow recursive calls to poll_cb, use less locking calls, too.
353			- fix the Gtk2-example in the SYNOPSIS.
354	root	1.14	- use pread/pwrite not pread64/pwrite64. this was simply a leftover
355			from Linux::AIO.
356			(found by compiling on cygwin. Unfortunately, cygwin declares but
357			does not implement pread/pwrite).
358			- only include <sys/syscall.h> on linux.
359
360	root	1.13	0.5 Tue Jul 12 13:03:09 CEST 2005
361	root	1.12	- removed #include <endian.h>, it's not portable, and we don't
362			need it anyway.
363			- link against -lrt, as it might contain goodies such as fdatasync,
364			and often aio_read, which we do not use yet, but it shouldn't hurt.
365
366	root	1.11	0.4 Mon Jul 11 05:28:25 CEST 2005
367	root	1.9	- added IO::AIO::flush, IO::AIO::poll.
368	root	1.10	- make callback argument optional for all calls.
369	root	1.8
370	root	1.7	0.3 Mon Jul 11 01:42:37 CEST 2005
371	root	1.5	- restructured manpage.
372	root	1.7	- added SYNOPSIS with examples for Event, Glib, Tk.
373			- remove explicit context support so I don't have to maintain
374			it for threaded perls (i.e. it should work now :).
375	root	1.5
376	root	1.4	0.2 Sun Jul 10 22:57:12 CEST 2005
377	root	1.2	- return immediately from poll_wait if nreqs==0.
378			- get rid of the request pipe and use faster thread-thread
379	root	1.3	communications for most requests and responses.
380	root	1.2
381	root	1.1	0.1
382			- cloned from Linux::AIO, which is very similar.
383