[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: fix setsig
TODO: splice/tee/vmsplice/sync_file_range? (http://kerneltrap.org/node/6505 http://lwn.net/Articles/178199/)

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:	1.133
Committed:	Sat Oct 6 14:05:19 2007 UTC (16 years, 8 months ago) by root
Branch:	MAIN
CVS Tags:	rel-2_51
Changes since 1.132:	+8 -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	1.109	TODO: fix setsig
7	root	1.123	TODO: splice/tee/vmsplice/sync_file_range? (http://kerneltrap.org/node/6505 http://lwn.net/Articles/178199/)
8	root	1.100
9	root	1.133	2.51 Sat Oct 6 16:04:54 CEST 2007
10			- perlio isn't generally threadsafe, so aio_close could not work reliably.
11			aio_close now tries a safe hack that might not be that asynchronous
12			(see the manpage for details).
13			- discard callback return values as to not grow the stack endlessly
14			when poll_cb handles many requests without returning.
15			- minor code cleanups.
16
17	root	1.132	2.5 Thu Oct 4 14:49:08 CEST 2007
18	root	1.131	- replaced _fd2fh with faster xs code.
19			- aio_close will now try to do "the right thing" and thus might
20			work sensibly for the very first time.
21
22	root	1.130	2.41 Mon Sep 24 21:28:21 CEST 2007
23	root	1.129	- after fork, invest some work to make sure that the poll_fileno
24			stays stable (by dup2'ing the new fd over the old one), to make
25			it easier for programs/libs that don't control their forking
26			behaviour and cannot recreate their watchers.
27
28	root	1.128	2.4 Sun Aug 5 18:44:22 CEST 2007
29	root	1.127	- add aio_truncate, aio_chmod, aio_chown, aio_utime (linux
30			successfully demonstrated that you can block on futimes...).
31	root	1.124	- allow undef as fileoffset for aio_read/write and use read/write(2)
32			internally (useful for sockets or O_APPEND handles).
33	root	1.126	- allow undef for length in aio_write.
34			- negative dataoffsets work as expected now in aio_read/aio_write.
35	root	1.124	- use NV instead of UV for 32 bit perls and file offsets, as NVs
36	root	1.125	have a larger range then.
37	root	1.120	- shared code between BDB and IO::AIO.
38	root	1.127	- aio_busy was completely broken. now fixed.
39			- readahead emulation now returns something.
40	root	1.121	- correctly set errno to ENOSYS on unimplemented functions
41			(should never happen, though).
42	root	1.127	- large changes to make it partially compile and run on win32,
43			but win32 lacks too much functionality, and perl overrides way
44			too many functions with crashing versions.
45	root	1.120
46	root	1.119	2.33 Tue Jan 23 23:55:41 CET 2007
47			- fix install path (Andreas J. Koenig).
48
49	root	1.118	2.32 Mon Jan 22 16:56:23 CET 2007
50	root	1.114	- added aio_rmtree.
51	root	1.115	- wow, aio_mkdir was missing.
52	root	1.116	- aio_load did return undef on error, not -1.
53	root	1.117	- use prefixexp not prefix in autoconf.pm
54			(suggested by ... rt.cpan.org unreachable).
55	root	1.118	- avoid installing autoconf.pm.
56	root	1.114
57	root	1.113	2.31 Sat Jan 6 03:46:02 CET 2007
58	root	1.112	- added aio_load.
59
60	root	1.111	2.3 Sat Dec 23 05:48:07 CET 2006
61			- fix off-by-one bug in aio_read, causing memory corruption
62			or crashes.
63
64	root	1.110	2.21 Fri Dec 22 05:03:38 CET 2006
65	root	1.108	- minor doc updates.
66	root	1.107	- minor cleanups.
67			- IO::AIO::poll returns request count.
68	root	1.109	- undocumented and unfinished async-signal-reporting.
69	root	1.107
70	root	1.103	2.2 Tue Oct 31 00:31:00 CET 2006
71	root	1.100	- minor doc updates.
72	root	1.101	- added aio_readlink.
73			- properly zero-terminate aio_read buffer.
74			- fix aio_read/write with nonzero dataoffset.
75	root	1.104	- reduced size of aio request structure.
76	root	1.106	- better diagnostics when pathnames etc. are not byte-encoded;
77	root	1.105	do not leak request in that case, either.
78	root	1.94
79	root	1.99	2.1 Sun Oct 29 02:01:57 CET 2006
80	root	1.98	- INCOMPATIBLE CHANGE: replace IO::AIO::poll_some by
81			IO::AIO::max_poll_reqs and IO::AIO::max_poll_time.
82	root	1.95	- fix a bug in aio_move where it would fail everytime
83			it would have to copy files manually.
84	root	1.98	- doc updates.
85	root	1.94	- start threads only on (very low) demand.
86	root	1.97	- end superfluous threads automatically after 10s idling.
87	root	1.98	- add IO::AIO::max_idle to control this.
88	root	1.94	- some tuning applied to random places.
89	root	1.95	- add aio_mknod.
90	root	1.59
91	root	1.92	2.0 Thu Oct 26 18:27:58 CEST 2006
92	root	1.90	- minor incompatibility: max_outstanding semantics have changed.
93	root	1.86	- major rewrite, consider all functionality EXPERIMENTAL.
94	root	1.68	- aio requests can be cancelled.
95	root	1.81	- callbacks can be (re-)set later.
96	root	1.93	- aio requests can choose between 9 priorities.
97	root	1.83	- add aio_group: aio requests can be grouped
98			into composite requests.
99			- generator interface for groups.
100	root	1.89	- add IO::AIO::poll_some.
101	root	1.72	- major documentation improvements.
102			- very minor bugfixes.
103	root	1.76	- add aio_nop for dummy requests.
104	root	1.84	- add aio_busy mainly for benchmarking and debugging.
105	root	1.79	- use "fast" mutexes on linux.
106	root	1.80	- use dynamic (and larger) buffers instead of
107			putting them onto the stack.
108			- optimise x86 and amd64 a bit.
109			- better error checking when ENOMEM.
110	root	1.85	- hopefully fix mem and dirp leaks on fork.
111	root	1.92	- warn about broken perl malloc.
112	root	1.88	- compiles on cygwin (but pread is broken on cygwin
113			which is not detected by autoconf, so you have to
114			edit autoconf/config.h yourself to enable emulation).
115	root	1.68
116	root	1.67	1.8 Sat Jun 24 22:20:44 CEST 2006
117	root	1.66	- add and/or document aio_rename, aio_link, aio_symlink and aio_move.
118
119	root	1.65	1.73 Wed Mar 1 22:49:32 CET 2006
120			- codename "jost"
121			- AIX/Solaris(?) aren't being helpful again, hardcode a value
122			for NAME_MAX and drive with your eyes closed (reported by
123			wcooley@nakedape.cc).
124	root	1.63
125	root	1.62	1.72 Thu Feb 2 00:40:44 CET 2006
126	root	1.61	- another minor bug in aio_scandir, again, the callback was called
127			twice when the directory can't be stat'ed.
128
129	root	1.60	1.71 Mon Dec 26 20:20:03 CET 2005
130			- grr, another minor bug in aio_scandir, this time resulting
131			in a runtime error.
132
133	root	1.59	1.7 Mon Dec 26 19:29:48 CET 2005
134	root	1.58	- aio_scandir errornously called callback twice in some cases.
135	root	1.57	- added AnyEvent example.
136
137	root	1.55	1.61 Wed Sep 7 19:40:42 CEST 2005
138	root	1.54	- no longer include $Config{libs}, as distros include too much
139	root	1.56	garbage in there that is not installed on typical systems
140	root	1.54	(for example, debian links perl against -lgdbm and many more
141			libraries despite perl not needing it, slowing down startup and
142			wasting memory).
143
144	root	1.53	1.6 Tue Aug 30 17:44:44 CEST 2005
145			- added aio_readdir, aio_scandir.
146	root	1.51	- added aio_sendfile, including sendfile emulation when sendfile
147			isn't available. Linux, FreeBSD and HP-UX might work (sendfilev
148			support is unavailable on my solaris 8 machine, but preliminary
149			code is there. What's lacking is configury stuff and testing...).
150	root	1.46
151	root	1.44	1.5 Sat Aug 20 02:32:19 CEST 2005
152	root	1.51	- create the aio threads on demand only (good after forking).
153	root	1.41	- somebody nagged about C89 compatibility, so this release should
154	root	1.42	be C89 compatible, but no guarantees for future ones.
155	root	1.43	- abort when the configure script fails.
156	root	1.41
157	root	1.40	1.4 Wed Aug 17 08:07:27 CEST 2005
158	root	1.93	- forgot to recreate the pipe after forking, this could cause
159	root	1.40	deadlocks.
160
161	root	1.39	1.3 Wed Aug 17 07:25:54 CEST 2005
162	root	1.33	- properly propagate exceptions from callbacks, instead of silently
163			eating them.
164	root	1.38	- use a different fork algorithm that avoids recursive callback
165			invocations and reduces fork latency in busy processes.
166	root	1.37	- fix a bug where the buffer scalar in aio_read got assigned the wrong
167			length after reading.
168			- fix a bug where the child would process some outstanding requests
169			from the parent.
170			- make a copy of the callback scalar, to avoid some very uncommon
171			(but valid) usages where the callback scalar changes.
172			- the callback was never freed in aio_read/aio_write.
173	root	1.38	- aio_read/aio_write will now set the readonly flag on the data
174			scalar for better error reporting.
175	root	1.33
176	root	1.32	1.2 Wed Aug 17 01:22:58 CEST 2005
177			- verified on cygwin, linux/amd64+ia32+alpha, solaris.
178	root	1.31	- use SvPVbyte for filenames now. You need to encode your strings to
179			the external filename encoding first.
180	root	1.32	- fix the bug where filehandles could leak (again).
181	root	1.31	- clarify freebsd situation: make it work and tell me how, or go away
182			with your underdocumented, broken and outdated OS.
183			- fork'ing should now be officially supported (where linux and
184			posix contradict each other, I followed posix).
185	root	1.32	- only call read() once per poll, not twice (speedup).
186			- new functions: aio_rmdir, aio_symlink.
187	root	1.31	- force callback arguments to be undef or a reference, for better
188			error catching.
189	root	1.1
190	root	1.29	1.1 Sun Aug 7 05:27:23 CEST 2005
191	root	1.25	- added configure script to detect availability of some calls.
192	root	1.27	(imperfect, as we cannot detect things like -lrt due to missing
193	root	1.23	feedback yet).
194	root	1.27	- emulate fdatasync via fsync, pread/pwrite via unsafe read/write
195			and readahead via manual reading on platforms lacking those.
196	root	1.19	- ported t/03_errors.t+framework by Brad Fitzpatrick
197			from Linux::AIO.
198	root	1.18	- removed XOPEN_SOURCE because stupid solaris 9 doesn't
199			compile with it enabled. Probably breaks others. Oh well.
200	root	1.24	- try to be more careful with errno on non-threaded perls.
201	root	1.26	- cygwins perl insisted on a matching open mode when morphing
202			the fd to an fh.
203	root	1.28	- convert sv's to "byte" encoding in aio_read/aio_write. Might
204			do that for pathnames, too, in the future, so make sure you
205			properly encode your pathnames.
206	root	1.18
207	root	1.17	1.0 Fri Jul 22 10:43:30 CEST 2005
208			- aio_open did not reliably deliver (open) filehandles.
209	root	1.16	- all aio_*-functions keep a reference to the filehandle so
210			it doesn't go away while the aio requests is working on it.
211			- disable warnings in AIO.pm.
212
213	root	1.15	0.9 Wed Jul 20 23:55:04 CEST 2005
214			- allow recursive calls to poll_cb, use less locking calls, too.
215			- fix the Gtk2-example in the SYNOPSIS.
216	root	1.14	- use pread/pwrite not pread64/pwrite64. this was simply a leftover
217			from Linux::AIO.
218			(found by compiling on cygwin. Unfortunately, cygwin declares but
219			does not implement pread/pwrite).
220			- only include <sys/syscall.h> on linux.
221
222	root	1.13	0.5 Tue Jul 12 13:03:09 CEST 2005
223	root	1.12	- removed #include <endian.h>, it's not portable, and we don't
224			need it anyway.
225			- link against -lrt, as it might contain goodies such as fdatasync,
226			and often aio_read, which we do not use yet, but it shouldn't hurt.
227
228	root	1.11	0.4 Mon Jul 11 05:28:25 CEST 2005
229	root	1.9	- added IO::AIO::flush, IO::AIO::poll.
230	root	1.10	- make callback argument optional for all calls.
231	root	1.8
232	root	1.7	0.3 Mon Jul 11 01:42:37 CEST 2005
233	root	1.5	- restructured manpage.
234	root	1.7	- added SYNOPSIS with examples for Event, Glib, Tk.
235			- remove explicit context support so I don't have to maintain
236			it for threaded perls (i.e. it should work now :).
237	root	1.5
238	root	1.4	0.2 Sun Jul 10 22:57:12 CEST 2005
239	root	1.2	- return immediately from poll_wait if nreqs==0.
240			- get rid of the request pipe and use faster thread-thread
241	root	1.3	communications for most requests and responses.
242	root	1.2
243	root	1.1	0.1
244			- cloned from Linux::AIO, which is very similar.
245