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Revision 1.86 by root, Sat Oct 28 23:32:29 2006 UTC vs.
Revision 1.110 by root, Sun Jul 8 09:09:34 2007 UTC

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5=head1 SYNOPSIS 5=head1 SYNOPSIS
6 6
7 use IO::AIO; 7 use IO::AIO;
8 8
9 aio_open "/etc/passwd", O_RDONLY, 0, sub { 9 aio_open "/etc/passwd", O_RDONLY, 0, sub {
10 my ($fh) = @_; 10 my $fh = shift
11 or die "/etc/passwd: $!";
11 ... 12 ...
12 }; 13 };
13 14
14 aio_unlink "/tmp/file", sub { }; 15 aio_unlink "/tmp/file", sub { };
15 16
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61etc.), but can also be used to easily do operations in parallel that are 62etc.), but can also be used to easily do operations in parallel that are
62normally done sequentially, e.g. stat'ing many files, which is much faster 63normally done sequentially, e.g. stat'ing many files, which is much faster
63on a RAID volume or over NFS when you do a number of stat operations 64on a RAID volume or over NFS when you do a number of stat operations
64concurrently. 65concurrently.
65 66
66While this works on all types of file descriptors (for example sockets), 67While most of this works on all types of file descriptors (for
67using these functions on file descriptors that support nonblocking 68example sockets), using these functions on file descriptors that
68operation (again, sockets, pipes etc.) is very inefficient. Use an event 69support nonblocking operation (again, sockets, pipes etc.) is very
69loop for that (such as the L<Event|Event> module): IO::AIO will naturally 70inefficient. Use an event loop for that (such as the L<Event|Event>
70fit into such an event loop itself. 71module): IO::AIO will naturally fit into such an event loop itself.
71 72
72In this version, a number of threads are started that execute your 73In this version, a number of threads are started that execute your
73requests and signal their completion. You don't need thread support 74requests and signal their completion. You don't need thread support
74in perl, and the threads created by this module will not be visible 75in perl, and the threads created by this module will not be visible
75to perl. In the future, this module might make use of the native aio 76to perl. In the future, this module might make use of the native aio
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77not well-supported or restricted (GNU/Linux doesn't allow them on normal 78not well-supported or restricted (GNU/Linux doesn't allow them on normal
78files currently, for example), and they would only support aio_read and 79files currently, for example), and they would only support aio_read and
79aio_write, so the remaining functionality would have to be implemented 80aio_write, so the remaining functionality would have to be implemented
80using threads anyway. 81using threads anyway.
81 82
82Although the module will work with in the presence of other (Perl-) 83Although the module will work in the presence of other (Perl-) threads,
83threads, it is currently not reentrant in any way, so use appropriate 84it is currently not reentrant in any way, so use appropriate locking
84locking yourself, always call C<poll_cb> from within the same thread, or 85yourself, always call C<poll_cb> from within the same thread, or never
85never call C<poll_cb> (or other C<aio_> functions) recursively. 86call C<poll_cb> (or other C<aio_> functions) recursively.
86 87
87=head2 EXAMPLE 88=head2 EXAMPLE
88 89
89This is a simple example that uses the Event module and loads 90This is a simple example that uses the Event module and loads
90F</etc/passwd> asynchronously: 91F</etc/passwd> asynchronously:
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98 poll => 'r', 99 poll => 'r',
99 cb => \&IO::AIO::poll_cb); 100 cb => \&IO::AIO::poll_cb);
100 101
101 # queue the request to open /etc/passwd 102 # queue the request to open /etc/passwd
102 aio_open "/etc/passwd", O_RDONLY, 0, sub { 103 aio_open "/etc/passwd", O_RDONLY, 0, sub {
103 my $fh = $_[0] 104 my $fh = shift
104 or die "error while opening: $!"; 105 or die "error while opening: $!";
105 106
106 # stat'ing filehandles is generally non-blocking 107 # stat'ing filehandles is generally non-blocking
107 my $size = -s $fh; 108 my $size = -s $fh;
108 109
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176Request has reached the end of its lifetime and holds no resources anymore 177Request has reached the end of its lifetime and holds no resources anymore
177(except possibly for the Perl object, but its connection to the actual 178(except possibly for the Perl object, but its connection to the actual
178aio request is severed and calling its methods will either do nothing or 179aio request is severed and calling its methods will either do nothing or
179result in a runtime error). 180result in a runtime error).
180 181
182=back
183
181=cut 184=cut
182 185
183package IO::AIO; 186package IO::AIO;
184 187
185no warnings; 188no warnings;
186use strict 'vars'; 189use strict 'vars';
187 190
188use base 'Exporter'; 191use base 'Exporter';
189 192
190BEGIN { 193BEGIN {
191 our $VERSION = '2.1'; 194 our $VERSION = '2.4';
192 195
193 our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat 196 our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat
194 aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink 197 aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink
195 aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move 198 aio_readlink aio_fsync aio_fdatasync aio_readahead aio_rename aio_link
196 aio_copy aio_group aio_nop aio_mknod); 199 aio_move aio_copy aio_group aio_nop aio_mknod aio_load aio_rmtree aio_mkdir
200 aio_chown aio_chmod aio_utime aio_truncate);
197 our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); 201 our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice aio_block));
198 our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush 202 our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush
199 min_parallel max_parallel max_idle 203 min_parallel max_parallel max_idle
200 nreqs nready npending nthreads 204 nreqs nready npending nthreads
201 max_poll_time max_poll_reqs); 205 max_poll_time max_poll_reqs);
202 206
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206 XSLoader::load ("IO::AIO", $VERSION); 210 XSLoader::load ("IO::AIO", $VERSION);
207} 211}
208 212
209=head1 FUNCTIONS 213=head1 FUNCTIONS
210 214
211=head2 AIO FUNCTIONS 215=head2 AIO REQUEST FUNCTIONS
212 216
213All the C<aio_*> calls are more or less thin wrappers around the syscall 217All the C<aio_*> calls are more or less thin wrappers around the syscall
214with the same name (sans C<aio_>). The arguments are similar or identical, 218with the same name (sans C<aio_>). The arguments are similar or identical,
215and they all accept an additional (and optional) C<$callback> argument 219and they all accept an additional (and optional) C<$callback> argument
216which must be a code reference. This code reference will get called with 220which must be a code reference. This code reference will get called with
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219syscall has been executed asynchronously. 223syscall has been executed asynchronously.
220 224
221All functions expecting a filehandle keep a copy of the filehandle 225All functions expecting a filehandle keep a copy of the filehandle
222internally until the request has finished. 226internally until the request has finished.
223 227
224All requests return objects of type L<IO::AIO::REQ> that allow further 228All functions return request objects of type L<IO::AIO::REQ> that allow
225manipulation of those requests while they are in-flight. 229further manipulation of those requests while they are in-flight.
226 230
227The pathnames you pass to these routines I<must> be absolute and 231The pathnames you pass to these routines I<must> be absolute and
228encoded in byte form. The reason for the former is that at the time the 232encoded as octets. The reason for the former is that at the time the
229request is being executed, the current working directory could have 233request is being executed, the current working directory could have
230changed. Alternatively, you can make sure that you never change the 234changed. Alternatively, you can make sure that you never change the
231current working directory. 235current working directory anywhere in the program and then use relative
236paths.
232 237
233To encode pathnames to byte form, either make sure you either: a) 238To encode pathnames as octets, either make sure you either: a) always pass
234always pass in filenames you got from outside (command line, readdir 239in filenames you got from outside (command line, readdir etc.) without
235etc.), b) are ASCII or ISO 8859-1, c) use the Encode module and encode 240tinkering, b) are ASCII or ISO 8859-1, c) use the Encode module and encode
236your pathnames to the locale (or other) encoding in effect in the user 241your pathnames to the locale (or other) encoding in effect in the user
237environment, d) use Glib::filename_from_unicode on unicode filenames or e) 242environment, d) use Glib::filename_from_unicode on unicode filenames or e)
238use something else. 243use something else to ensure your scalar has the correct contents.
244
245This works, btw. independent of the internal UTF-8 bit, which IO::AIO
246handles correctly wether it is set or not.
239 247
240=over 4 248=over 4
241 249
242=item $prev_pri = aioreq_pri [$pri] 250=item $prev_pri = aioreq_pri [$pri]
243 251
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263 aio_read $_[0], ..., sub { 271 aio_read $_[0], ..., sub {
264 ... 272 ...
265 }; 273 };
266 }; 274 };
267 275
276
268=item aioreq_nice $pri_adjust 277=item aioreq_nice $pri_adjust
269 278
270Similar to C<aioreq_pri>, but subtracts the given value from the current 279Similar to C<aioreq_pri>, but subtracts the given value from the current
271priority, so effects are cumulative. 280priority, so the effect is cumulative.
281
272 282
273=item aio_open $pathname, $flags, $mode, $callback->($fh) 283=item aio_open $pathname, $flags, $mode, $callback->($fh)
274 284
275Asynchronously open or create a file and call the callback with a newly 285Asynchronously open or create a file and call the callback with a newly
276created filehandle for the file. 286created filehandle for the file.
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282list. They are the same as used by C<sysopen>. 292list. They are the same as used by C<sysopen>.
283 293
284Likewise, C<$mode> specifies the mode of the newly created file, if it 294Likewise, C<$mode> specifies the mode of the newly created file, if it
285didn't exist and C<O_CREAT> has been given, just like perl's C<sysopen>, 295didn't exist and C<O_CREAT> has been given, just like perl's C<sysopen>,
286except that it is mandatory (i.e. use C<0> if you don't create new files, 296except that it is mandatory (i.e. use C<0> if you don't create new files,
287and C<0666> or C<0777> if you do). 297and C<0666> or C<0777> if you do). Note that the C<$mode> will be modified
298by the umask in effect then the request is being executed, so better never
299change the umask.
288 300
289Example: 301Example:
290 302
291 aio_open "/etc/passwd", O_RDONLY, 0, sub { 303 aio_open "/etc/passwd", O_RDONLY, 0, sub {
292 if ($_[0]) { 304 if ($_[0]) {
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295 } else { 307 } else {
296 die "open failed: $!\n"; 308 die "open failed: $!\n";
297 } 309 }
298 }; 310 };
299 311
312
300=item aio_close $fh, $callback->($status) 313=item aio_close $fh, $callback->($status)
301 314
302Asynchronously close a file and call the callback with the result 315Asynchronously close a file and call the callback with the result
303code. I<WARNING:> although accepted, you should not pass in a perl 316code. I<WARNING:> although accepted, you should not pass in a perl
304filehandle here, as perl will likely close the file descriptor another 317filehandle here, as perl will likely close the file descriptor another
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306C<close> or just let filehandles go out of scope. 319C<close> or just let filehandles go out of scope.
307 320
308This is supposed to be a bug in the API, so that might change. It's 321This is supposed to be a bug in the API, so that might change. It's
309therefore best to avoid this function. 322therefore best to avoid this function.
310 323
324
311=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) 325=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
312 326
313=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) 327=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
314 328
315Reads or writes C<length> bytes from the specified C<fh> and C<offset> 329Reads or writes C<$length> bytes from the specified C<$fh> and C<$offset>
316into the scalar given by C<data> and offset C<dataoffset> and calls the 330into the scalar given by C<$data> and offset C<$dataoffset> and calls the
317callback without the actual number of bytes read (or -1 on error, just 331callback without the actual number of bytes read (or -1 on error, just
318like the syscall). 332like the syscall).
319 333
334If C<$offset> is undefined, then the current file offset will be used (and
335updated), otherwise the file offset will not be changed by these calls.
336
337If C<$length> is undefined in C<aio_write>, use the remaining length of C<$data>.
338
339If C<$dataoffset> is less than zero, it will be counted from the end of
340C<$data>.
341
320The C<$data> scalar I<MUST NOT> be modified in any way while the request 342The C<$data> scalar I<MUST NOT> be modified in any way while the request
321is outstanding. Modifying it can result in segfaults or WW3 (if the 343is outstanding. Modifying it can result in segfaults or World War III (if
322necessary/optional hardware is installed). 344the necessary/optional hardware is installed).
323 345
324Example: Read 15 bytes at offset 7 into scalar C<$buffer>, starting at 346Example: Read 15 bytes at offset 7 into scalar C<$buffer>, starting at
325offset C<0> within the scalar: 347offset C<0> within the scalar:
326 348
327 aio_read $fh, 7, 15, $buffer, 0, sub { 349 aio_read $fh, 7, 15, $buffer, 0, sub {
328 $_[0] > 0 or die "read error: $!"; 350 $_[0] > 0 or die "read error: $!";
329 print "read $_[0] bytes: <$buffer>\n"; 351 print "read $_[0] bytes: <$buffer>\n";
330 }; 352 };
353
331 354
332=item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) 355=item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval)
333 356
334Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts 357Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts
335reading at byte offset C<$in_offset>, and starts writing at the current 358reading at byte offset C<$in_offset>, and starts writing at the current
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349C<$in_fh> than are written, and there is no way to find out how many 372C<$in_fh> than are written, and there is no way to find out how many
350bytes have been read from C<aio_sendfile> alone, as C<aio_sendfile> only 373bytes have been read from C<aio_sendfile> alone, as C<aio_sendfile> only
351provides the number of bytes written to C<$out_fh>. Only if the result 374provides the number of bytes written to C<$out_fh>. Only if the result
352value equals C<$length> one can assume that C<$length> bytes have been 375value equals C<$length> one can assume that C<$length> bytes have been
353read. 376read.
377
354 378
355=item aio_readahead $fh,$offset,$length, $callback->($retval) 379=item aio_readahead $fh,$offset,$length, $callback->($retval)
356 380
357C<aio_readahead> populates the page cache with data from a file so that 381C<aio_readahead> populates the page cache with data from a file so that
358subsequent reads from that file will not block on disk I/O. The C<$offset> 382subsequent reads from that file will not block on disk I/O. The C<$offset>
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364file. The current file offset of the file is left unchanged. 388file. The current file offset of the file is left unchanged.
365 389
366If that syscall doesn't exist (likely if your OS isn't Linux) it will be 390If that syscall doesn't exist (likely if your OS isn't Linux) it will be
367emulated by simply reading the data, which would have a similar effect. 391emulated by simply reading the data, which would have a similar effect.
368 392
393
369=item aio_stat $fh_or_path, $callback->($status) 394=item aio_stat $fh_or_path, $callback->($status)
370 395
371=item aio_lstat $fh, $callback->($status) 396=item aio_lstat $fh, $callback->($status)
372 397
373Works like perl's C<stat> or C<lstat> in void context. The callback will 398Works like perl's C<stat> or C<lstat> in void context. The callback will
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386 aio_stat "/etc/passwd", sub { 411 aio_stat "/etc/passwd", sub {
387 $_[0] and die "stat failed: $!"; 412 $_[0] and die "stat failed: $!";
388 print "size is ", -s _, "\n"; 413 print "size is ", -s _, "\n";
389 }; 414 };
390 415
416
417=item aio_utime $fh_or_path, $atime, $mtime, $callback->($status)
418
419Works like perl's C<utime> function (including the special case of $atime
420and $mtime being undef). Fractional times are supported if the underlying
421syscalls support them.
422
423When called with a pathname, uses utimes(2) if available, otherwise
424utime(2). If called on a file descriptor, uses futimes(2) if available,
425otherwise returns ENOSYS, so this is not portable.
426
427Examples:
428
429 # set atime and mtime to current time (basically touch(1)):
430 aio_utime "path", undef, undef;
431 # set atime to current time and mtime to beginning of the epoch:
432 aio_utime "path", time, undef; # undef==0
433
434
435=item aio_chown $fh_or_path, $uid, $gid, $callback->($status)
436
437Works like perl's C<chown> function, except that C<undef> for either $uid
438or $gid is being interpreted as "do not change" (but -1 can also be used).
439
440Examples:
441
442 # same as "chown root path" in the shell:
443 aio_chown "path", 0, -1;
444 # same as above:
445 aio_chown "path", 0, undef;
446
447
448=item aio_truncate $fh_or_path, $offset, $callback->($status)
449
450Works like truncate(2) or ftruncate(2).
451
452
453=item aio_chmod $fh_or_path, $mode, $callback->($status)
454
455Works like perl's C<chmod> function.
456
457
391=item aio_unlink $pathname, $callback->($status) 458=item aio_unlink $pathname, $callback->($status)
392 459
393Asynchronously unlink (delete) a file and call the callback with the 460Asynchronously unlink (delete) a file and call the callback with the
394result code. 461result code.
395 462
463
396=item aio_mknod $path, $mode, $dev, $callback->($status) 464=item aio_mknod $path, $mode, $dev, $callback->($status)
397 465
398[EXPERIMENTAL] 466[EXPERIMENTAL]
399 467
400Asynchronously create a device node (or fifo). See mknod(2). 468Asynchronously create a device node (or fifo). See mknod(2).
401 469
402The only (POSIX-) portable way of calling this function is: 470The only (POSIX-) portable way of calling this function is:
403 471
404 aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ... 472 aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ...
473
405 474
406=item aio_link $srcpath, $dstpath, $callback->($status) 475=item aio_link $srcpath, $dstpath, $callback->($status)
407 476
408Asynchronously create a new link to the existing object at C<$srcpath> at 477Asynchronously create a new link to the existing object at C<$srcpath> at
409the path C<$dstpath> and call the callback with the result code. 478the path C<$dstpath> and call the callback with the result code.
410 479
480
411=item aio_symlink $srcpath, $dstpath, $callback->($status) 481=item aio_symlink $srcpath, $dstpath, $callback->($status)
412 482
413Asynchronously create a new symbolic link to the existing object at C<$srcpath> at 483Asynchronously create a new symbolic link to the existing object at C<$srcpath> at
414the path C<$dstpath> and call the callback with the result code. 484the path C<$dstpath> and call the callback with the result code.
415 485
486
487=item aio_readlink $path, $callback->($link)
488
489Asynchronously read the symlink specified by C<$path> and pass it to
490the callback. If an error occurs, nothing or undef gets passed to the
491callback.
492
493
416=item aio_rename $srcpath, $dstpath, $callback->($status) 494=item aio_rename $srcpath, $dstpath, $callback->($status)
417 495
418Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as 496Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as
419rename(2) and call the callback with the result code. 497rename(2) and call the callback with the result code.
420 498
499
500=item aio_mkdir $pathname, $mode, $callback->($status)
501
502Asynchronously mkdir (create) a directory and call the callback with
503the result code. C<$mode> will be modified by the umask at the time the
504request is executed, so do not change your umask.
505
506
421=item aio_rmdir $pathname, $callback->($status) 507=item aio_rmdir $pathname, $callback->($status)
422 508
423Asynchronously rmdir (delete) a directory and call the callback with the 509Asynchronously rmdir (delete) a directory and call the callback with the
424result code. 510result code.
511
425 512
426=item aio_readdir $pathname, $callback->($entries) 513=item aio_readdir $pathname, $callback->($entries)
427 514
428Unlike the POSIX call of the same name, C<aio_readdir> reads an entire 515Unlike the POSIX call of the same name, C<aio_readdir> reads an entire
429directory (i.e. opendir + readdir + closedir). The entries will not be 516directory (i.e. opendir + readdir + closedir). The entries will not be
430sorted, and will B<NOT> include the C<.> and C<..> entries. 517sorted, and will B<NOT> include the C<.> and C<..> entries.
431 518
432The callback a single argument which is either C<undef> or an array-ref 519The callback a single argument which is either C<undef> or an array-ref
433with the filenames. 520with the filenames.
521
522
523=item aio_load $path, $data, $callback->($status)
524
525This is a composite request that tries to fully load the given file into
526memory. Status is the same as with aio_read.
527
528=cut
529
530sub aio_load($$;$) {
531 aio_block {
532 my ($path, undef, $cb) = @_;
533 my $data = \$_[1];
534
535 my $pri = aioreq_pri;
536 my $grp = aio_group $cb;
537
538 aioreq_pri $pri;
539 add $grp aio_open $path, O_RDONLY, 0, sub {
540 my $fh = shift
541 or return $grp->result (-1);
542
543 aioreq_pri $pri;
544 add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub {
545 $grp->result ($_[0]);
546 };
547 };
548
549 $grp
550 }
551}
434 552
435=item aio_copy $srcpath, $dstpath, $callback->($status) 553=item aio_copy $srcpath, $dstpath, $callback->($status)
436 554
437Try to copy the I<file> (directories not supported as either source or 555Try to copy the I<file> (directories not supported as either source or
438destination) from C<$srcpath> to C<$dstpath> and call the callback with 556destination) from C<$srcpath> to C<$dstpath> and call the callback with
… …
448errors are being ignored. 566errors are being ignored.
449 567
450=cut 568=cut
451 569
452sub aio_copy($$;$) { 570sub aio_copy($$;$) {
571 aio_block {
453 my ($src, $dst, $cb) = @_; 572 my ($src, $dst, $cb) = @_;
454 573
455 my $pri = aioreq_pri; 574 my $pri = aioreq_pri;
456 my $grp = aio_group $cb; 575 my $grp = aio_group $cb;
457 576
458 aioreq_pri $pri; 577 aioreq_pri $pri;
459 add $grp aio_open $src, O_RDONLY, 0, sub { 578 add $grp aio_open $src, O_RDONLY, 0, sub {
460 if (my $src_fh = $_[0]) { 579 if (my $src_fh = $_[0]) {
461 my @stat = stat $src_fh; 580 my @stat = stat $src_fh;
462 581
463 aioreq_pri $pri; 582 aioreq_pri $pri;
464 add $grp aio_open $dst, O_CREAT | O_WRONLY | O_TRUNC, 0200, sub { 583 add $grp aio_open $dst, O_CREAT | O_WRONLY | O_TRUNC, 0200, sub {
465 if (my $dst_fh = $_[0]) { 584 if (my $dst_fh = $_[0]) {
466 aioreq_pri $pri; 585 aioreq_pri $pri;
467 add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { 586 add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {
468 if ($_[0] == $stat[7]) { 587 if ($_[0] == $stat[7]) {
469 $grp->result (0); 588 $grp->result (0);
470 close $src_fh; 589 close $src_fh;
471 590
472 # those should not normally block. should. should. 591 # those should not normally block. should. should.
473 utime $stat[8], $stat[9], $dst; 592 utime $stat[8], $stat[9], $dst;
474 chmod $stat[2] & 07777, $dst_fh; 593 chmod $stat[2] & 07777, $dst_fh;
475 chown $stat[4], $stat[5], $dst_fh; 594 chown $stat[4], $stat[5], $dst_fh;
476 close $dst_fh; 595 close $dst_fh;
477 } else { 596 } else {
478 $grp->result (-1); 597 $grp->result (-1);
479 close $src_fh; 598 close $src_fh;
480 close $dst_fh; 599 close $dst_fh;
481 600
482 aioreq $pri; 601 aioreq $pri;
483 add $grp aio_unlink $dst; 602 add $grp aio_unlink $dst;
603 }
484 } 604 };
605 } else {
606 $grp->result (-1);
485 }; 607 }
486 } else {
487 $grp->result (-1);
488 } 608 },
609
610 } else {
611 $grp->result (-1);
489 }, 612 }
490
491 } else {
492 $grp->result (-1);
493 } 613 };
614
615 $grp
494 }; 616 }
495
496 $grp
497} 617}
498 618
499=item aio_move $srcpath, $dstpath, $callback->($status) 619=item aio_move $srcpath, $dstpath, $callback->($status)
500 620
501Try to move the I<file> (directories not supported as either source or 621Try to move the I<file> (directories not supported as either source or
… …
507that is successful, unlinking the C<$srcpath>. 627that is successful, unlinking the C<$srcpath>.
508 628
509=cut 629=cut
510 630
511sub aio_move($$;$) { 631sub aio_move($$;$) {
632 aio_block {
512 my ($src, $dst, $cb) = @_; 633 my ($src, $dst, $cb) = @_;
513 634
514 my $pri = aioreq_pri; 635 my $pri = aioreq_pri;
515 my $grp = aio_group $cb; 636 my $grp = aio_group $cb;
516 637
517 aioreq_pri $pri; 638 aioreq_pri $pri;
518 add $grp aio_rename $src, $dst, sub { 639 add $grp aio_rename $src, $dst, sub {
519 if ($_[0] && $! == EXDEV) { 640 if ($_[0] && $! == EXDEV) {
520 aioreq_pri $pri; 641 aioreq_pri $pri;
521 add $grp aio_copy $src, $dst, sub { 642 add $grp aio_copy $src, $dst, sub {
643 $grp->result ($_[0]);
644
645 if (!$_[0]) {
646 aioreq_pri $pri;
647 add $grp aio_unlink $src;
648 }
649 };
650 } else {
522 $grp->result ($_[0]); 651 $grp->result ($_[0]);
523
524 if (!$_[0]) {
525 aioreq_pri $pri;
526 add $grp aio_unlink $src;
527 }
528 }; 652 }
529 } else {
530 $grp->result ($_[0]);
531 } 653 };
654
655 $grp
532 }; 656 }
533
534 $grp
535} 657}
536 658
537=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) 659=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
538 660
539Scans a directory (similar to C<aio_readdir>) but additionally tries to 661Scans a directory (similar to C<aio_readdir>) but additionally tries to
… …
586as those tend to return 0 or 1 as link counts, which disables the 708as those tend to return 0 or 1 as link counts, which disables the
587directory counting heuristic. 709directory counting heuristic.
588 710
589=cut 711=cut
590 712
591sub aio_scandir($$$) { 713sub aio_scandir($$;$) {
714 aio_block {
592 my ($path, $maxreq, $cb) = @_; 715 my ($path, $maxreq, $cb) = @_;
593 716
594 my $pri = aioreq_pri; 717 my $pri = aioreq_pri;
595 718
596 my $grp = aio_group $cb; 719 my $grp = aio_group $cb;
597 720
598 $maxreq = 4 if $maxreq <= 0; 721 $maxreq = 4 if $maxreq <= 0;
599 722
600 # stat once 723 # stat once
601 aioreq_pri $pri;
602 add $grp aio_stat $path, sub {
603 return $grp->result () if $_[0];
604 my $now = time;
605 my $hash1 = join ":", (stat _)[0,1,3,7,9];
606
607 # read the directory entries
608 aioreq_pri $pri; 724 aioreq_pri $pri;
609 add $grp aio_readdir $path, sub { 725 add $grp aio_stat $path, sub {
610 my $entries = shift
611 or return $grp->result (); 726 return $grp->result () if $_[0];
727 my $now = time;
728 my $hash1 = join ":", (stat _)[0,1,3,7,9];
612 729
613 # stat the dir another time 730 # read the directory entries
614 aioreq_pri $pri; 731 aioreq_pri $pri;
732 add $grp aio_readdir $path, sub {
733 my $entries = shift
734 or return $grp->result ();
735
736 # stat the dir another time
737 aioreq_pri $pri;
615 add $grp aio_stat $path, sub { 738 add $grp aio_stat $path, sub {
616 my $hash2 = join ":", (stat _)[0,1,3,7,9]; 739 my $hash2 = join ":", (stat _)[0,1,3,7,9];
617 740
618 my $ndirs; 741 my $ndirs;
619 742
620 # take the slow route if anything looks fishy 743 # take the slow route if anything looks fishy
621 if ($hash1 ne $hash2 or (stat _)[9] == $now) { 744 if ($hash1 ne $hash2 or (stat _)[9] == $now) {
622 $ndirs = -1; 745 $ndirs = -1;
623 } else { 746 } else {
624 # if nlink == 2, we are finished 747 # if nlink == 2, we are finished
625 # on non-posix-fs's, we rely on nlink < 2 748 # on non-posix-fs's, we rely on nlink < 2
626 $ndirs = (stat _)[3] - 2 749 $ndirs = (stat _)[3] - 2
627 or return $grp->result ([], $entries); 750 or return $grp->result ([], $entries);
628 } 751 }
629 752
630 # sort into likely dirs and likely nondirs 753 # sort into likely dirs and likely nondirs
631 # dirs == files without ".", short entries first 754 # dirs == files without ".", short entries first
632 $entries = [map $_->[0], 755 $entries = [map $_->[0],
633 sort { $b->[1] cmp $a->[1] } 756 sort { $b->[1] cmp $a->[1] }
634 map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length], 757 map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],
635 @$entries]; 758 @$entries];
636 759
637 my (@dirs, @nondirs); 760 my (@dirs, @nondirs);
638 761
639 my $statgrp = add $grp aio_group sub { 762 my $statgrp = add $grp aio_group sub {
640 $grp->result (\@dirs, \@nondirs); 763 $grp->result (\@dirs, \@nondirs);
641 }; 764 };
642 765
643 limit $statgrp $maxreq; 766 limit $statgrp $maxreq;
644 feed $statgrp sub { 767 feed $statgrp sub {
645 return unless @$entries; 768 return unless @$entries;
646 my $entry = pop @$entries; 769 my $entry = pop @$entries;
647 770
648 aioreq_pri $pri; 771 aioreq_pri $pri;
649 add $statgrp aio_stat "$path/$entry/.", sub { 772 add $statgrp aio_stat "$path/$entry/.", sub {
650 if ($_[0] < 0) { 773 if ($_[0] < 0) {
651 push @nondirs, $entry; 774 push @nondirs, $entry;
652 } else { 775 } else {
653 # need to check for real directory 776 # need to check for real directory
654 aioreq_pri $pri; 777 aioreq_pri $pri;
655 add $statgrp aio_lstat "$path/$entry", sub { 778 add $statgrp aio_lstat "$path/$entry", sub {
656 if (-d _) { 779 if (-d _) {
657 push @dirs, $entry; 780 push @dirs, $entry;
658 781
659 unless (--$ndirs) { 782 unless (--$ndirs) {
660 push @nondirs, @$entries; 783 push @nondirs, @$entries;
661 feed $statgrp; 784 feed $statgrp;
785 }
786 } else {
787 push @nondirs, $entry;
662 } 788 }
663 } else {
664 push @nondirs, $entry;
665 } 789 }
666 } 790 }
667 } 791 };
668 }; 792 };
669 }; 793 };
670 }; 794 };
671 }; 795 };
796
797 $grp
672 }; 798 }
799}
673 800
801=item aio_rmtree $path, $callback->($status)
802
803Delete a directory tree starting (and including) C<$path>, return the
804status of the final C<rmdir> only. This is a composite request that
805uses C<aio_scandir> to recurse into and rmdir directories, and unlink
806everything else.
807
808=cut
809
810sub aio_rmtree;
811sub aio_rmtree($;$) {
812 aio_block {
813 my ($path, $cb) = @_;
814
815 my $pri = aioreq_pri;
816 my $grp = aio_group $cb;
817
818 aioreq_pri $pri;
819 add $grp aio_scandir $path, 0, sub {
820 my ($dirs, $nondirs) = @_;
821
822 my $dirgrp = aio_group sub {
823 add $grp aio_rmdir $path, sub {
824 $grp->result ($_[0]);
825 };
826 };
827
828 (aioreq_pri $pri), add $dirgrp aio_rmtree "$path/$_" for @$dirs;
829 (aioreq_pri $pri), add $dirgrp aio_unlink "$path/$_" for @$nondirs;
830
831 add $grp $dirgrp;
832 };
833
674 $grp 834 $grp
835 }
675} 836}
676 837
677=item aio_fsync $fh, $callback->($status) 838=item aio_fsync $fh, $callback->($status)
678 839
679Asynchronously call fsync on the given filehandle and call the callback 840Asynchronously call fsync on the given filehandle and call the callback
… …
933that are being processed by C<IO::AIO::poll_cb> in one call, respectively 1094that are being processed by C<IO::AIO::poll_cb> in one call, respectively
934the maximum amount of time (default C<0>, meaning infinity) spent in 1095the maximum amount of time (default C<0>, meaning infinity) spent in
935C<IO::AIO::poll_cb> to process requests (more correctly the mininum amount 1096C<IO::AIO::poll_cb> to process requests (more correctly the mininum amount
936of time C<poll_cb> is allowed to use). 1097of time C<poll_cb> is allowed to use).
937 1098
1099Setting C<max_poll_time> to a non-zero value creates an overhead of one
1100syscall per request processed, which is not normally a problem unless your
1101callbacks are really really fast or your OS is really really slow (I am
1102not mentioning Solaris here). Using C<max_poll_reqs> incurs no overhead.
1103
938Setting these is useful if you want to ensure some level of 1104Setting these is useful if you want to ensure some level of
939interactiveness when perl is not fast enough to process all requests in 1105interactiveness when perl is not fast enough to process all requests in
940time. 1106time.
941 1107
942For interactive programs, values such as C<0.01> to C<0.1> should be fine. 1108For interactive programs, values such as C<0.01> to C<0.1> should be fine.
943 1109
944Example: Install an Event watcher that automatically calls 1110Example: Install an Event watcher that automatically calls
945IO::AIO::poll_some with low priority, to ensure that other parts of the 1111IO::AIO::poll_cb with low priority, to ensure that other parts of the
946program get the CPU sometimes even under high AIO load. 1112program get the CPU sometimes even under high AIO load.
947 1113
948 # try not to spend much more than 0.1s in poll_cb 1114 # try not to spend much more than 0.1s in poll_cb
949 IO::AIO::max_poll_time 0.1; 1115 IO::AIO::max_poll_time 0.1;
950 1116
… …
953 poll => 'r', nice => 1, 1119 poll => 'r', nice => 1,
954 cb => &IO::AIO::poll_cb); 1120 cb => &IO::AIO::poll_cb);
955 1121
956=item IO::AIO::poll_wait 1122=item IO::AIO::poll_wait
957 1123
1124If there are any outstanding requests and none of them in the result
958Wait till the result filehandle becomes ready for reading (simply does a 1125phase, wait till the result filehandle becomes ready for reading (simply
959C<select> on the filehandle. This is useful if you want to synchronously 1126does a C<select> on the filehandle. This is useful if you want to
960wait for some requests to finish). 1127synchronously wait for some requests to finish).
961 1128
962See C<nreqs> for an example. 1129See C<nreqs> for an example.
963 1130
964=item IO::AIO::poll 1131=item IO::AIO::poll
965 1132
966Waits until some requests have been handled. 1133Waits until some requests have been handled.
967 1134
1135Returns the number of requests processed, but is otherwise strictly
968Strictly equivalent to: 1136equivalent to:
969 1137
970 IO::AIO::poll_wait, IO::AIO::poll_cb 1138 IO::AIO::poll_wait, IO::AIO::poll_cb
971 if IO::AIO::nreqs;
972 1139
973=item IO::AIO::flush 1140=item IO::AIO::flush
974 1141
975Wait till all outstanding AIO requests have been handled. 1142Wait till all outstanding AIO requests have been handled.
976 1143
977Strictly equivalent to: 1144Strictly equivalent to:
978 1145
979 IO::AIO::poll_wait, IO::AIO::poll_cb 1146 IO::AIO::poll_wait, IO::AIO::poll_cb
980 while IO::AIO::nreqs; 1147 while IO::AIO::nreqs;
981 1148
1149=back
1150
982=head3 CONTROLLING THE NUMBER OF THREADS 1151=head3 CONTROLLING THE NUMBER OF THREADS
1152
1153=over
983 1154
984=item IO::AIO::min_parallel $nthreads 1155=item IO::AIO::min_parallel $nthreads
985 1156
986Set the minimum number of AIO threads to C<$nthreads>. The current 1157Set the minimum number of AIO threads to C<$nthreads>. The current
987default is C<8>, which means eight asynchronous operations can execute 1158default is C<8>, which means eight asynchronous operations can execute
… …
1046 1217
1047You can still queue as many requests as you want. Therefore, 1218You can still queue as many requests as you want. Therefore,
1048C<max_oustsanding> is mainly useful in simple scripts (with low values) or 1219C<max_oustsanding> is mainly useful in simple scripts (with low values) or
1049as a stop gap to shield against fatal memory overflow (with large values). 1220as a stop gap to shield against fatal memory overflow (with large values).
1050 1221
1222=back
1223
1051=head3 STATISTICAL INFORMATION 1224=head3 STATISTICAL INFORMATION
1225
1226=over
1052 1227
1053=item IO::AIO::nreqs 1228=item IO::AIO::nreqs
1054 1229
1055Returns the number of requests currently in the ready, execute or pending 1230Returns the number of requests currently in the ready, execute or pending
1056states (i.e. for which their callback has not been invoked yet). 1231states (i.e. for which their callback has not been invoked yet).
… …
1090 *$sym 1265 *$sym
1091} 1266}
1092 1267
1093min_parallel 8; 1268min_parallel 8;
1094 1269
1095END { 1270END { flush }
1096 min_parallel 1;
1097 flush;
1098};
1099 1271
11001; 12721;
1101 1273
1102=head2 FORK BEHAVIOUR 1274=head2 FORK BEHAVIOUR
1103 1275

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