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Revision 1.94 by root, Wed Nov 8 02:01:02 2006 UTC vs.
Revision 1.110 by root, Sun Jul 8 09:09:34 2007 UTC

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62etc.), 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
63normally 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
64on 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
65concurrently. 65concurrently.
66 66
67While most of this works on all types of file descriptors (for example 67While most of this works on all types of file descriptors (for
68sockets), using these functions on file descriptors that support 68example sockets), using these functions on file descriptors that
69nonblocking operation (again, sockets, pipes etc.) is very inefficient or 69support nonblocking operation (again, sockets, pipes etc.) is very
70might not work (aio_read fails on sockets/pipes/fifos). Use an event loop 70inefficient. Use an event loop for that (such as the L<Event|Event>
71for that (such as the L<Event|Event> module): IO::AIO will naturally fit 71module): IO::AIO will naturally fit into such an event loop itself.
72into such an event loop itself.
73 72
74In this version, a number of threads are started that execute your 73In this version, a number of threads are started that execute your
75requests and signal their completion. You don't need thread support 74requests and signal their completion. You don't need thread support
76in 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
77to 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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79not 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
80files currently, for example), and they would only support aio_read and 79files currently, for example), and they would only support aio_read and
81aio_write, so the remaining functionality would have to be implemented 80aio_write, so the remaining functionality would have to be implemented
82using threads anyway. 81using threads anyway.
83 82
84Although the module will work with in the presence of other (Perl-) 83Although the module will work in the presence of other (Perl-) threads,
85threads, it is currently not reentrant in any way, so use appropriate 84it is currently not reentrant in any way, so use appropriate locking
86locking 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
87never call C<poll_cb> (or other C<aio_> functions) recursively. 86call C<poll_cb> (or other C<aio_> functions) recursively.
88 87
89=head2 EXAMPLE 88=head2 EXAMPLE
90 89
91This is a simple example that uses the Event module and loads 90This is a simple example that uses the Event module and loads
92F</etc/passwd> asynchronously: 91F</etc/passwd> asynchronously:
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190use strict 'vars'; 189use strict 'vars';
191 190
192use base 'Exporter'; 191use base 'Exporter';
193 192
194BEGIN { 193BEGIN {
195 our $VERSION = '2.2'; 194 our $VERSION = '2.4';
196 195
197 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
198 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
199 aio_readlink aio_fsync aio_fdatasync aio_readahead aio_rename aio_link 198 aio_readlink aio_fsync aio_fdatasync aio_readahead aio_rename aio_link
200 aio_move 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);
201 our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); 201 our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice aio_block));
202 our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush 202 our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush
203 min_parallel max_parallel max_idle 203 min_parallel max_parallel max_idle
204 nreqs nready npending nthreads 204 nreqs nready npending nthreads
205 max_poll_time max_poll_reqs); 205 max_poll_time max_poll_reqs);
206 206
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271 aio_read $_[0], ..., sub { 271 aio_read $_[0], ..., sub {
272 ... 272 ...
273 }; 273 };
274 }; 274 };
275 275
276
276=item aioreq_nice $pri_adjust 277=item aioreq_nice $pri_adjust
277 278
278Similar 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
279priority, so the effect is cumulative. 280priority, so the effect is cumulative.
281
280 282
281=item aio_open $pathname, $flags, $mode, $callback->($fh) 283=item aio_open $pathname, $flags, $mode, $callback->($fh)
282 284
283Asynchronously 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
284created filehandle for the file. 286created filehandle for the file.
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290list. They are the same as used by C<sysopen>. 292list. They are the same as used by C<sysopen>.
291 293
292Likewise, 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
293didn'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>,
294except 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,
295and C<0666> or C<0777> if you do). 297and C<0666> or C<0777> if you do). Note that the C<$mode> will be modified
298by the umask in effect then the request is being executed, so better never
299change the umask.
296 300
297Example: 301Example:
298 302
299 aio_open "/etc/passwd", O_RDONLY, 0, sub { 303 aio_open "/etc/passwd", O_RDONLY, 0, sub {
300 if ($_[0]) { 304 if ($_[0]) {
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303 } else { 307 } else {
304 die "open failed: $!\n"; 308 die "open failed: $!\n";
305 } 309 }
306 }; 310 };
307 311
312
308=item aio_close $fh, $callback->($status) 313=item aio_close $fh, $callback->($status)
309 314
310Asynchronously close a file and call the callback with the result 315Asynchronously close a file and call the callback with the result
311code. I<WARNING:> although accepted, you should not pass in a perl 316code. I<WARNING:> although accepted, you should not pass in a perl
312filehandle 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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314C<close> or just let filehandles go out of scope. 319C<close> or just let filehandles go out of scope.
315 320
316This 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
317therefore best to avoid this function. 322therefore best to avoid this function.
318 323
324
319=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) 325=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
320 326
321=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) 327=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
322 328
323Reads 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<$offset>
324into the scalar given by C<data> and offset C<dataoffset> and calls the 330into the scalar given by C<$data> and offset C<$dataoffset> and calls the
325callback without the actual number of bytes read (or -1 on error, just 331callback without the actual number of bytes read (or -1 on error, just
326like the syscall). 332like the syscall).
327 333
334If C<$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
328The 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
329is outstanding. Modifying it can result in segfaults or WW3 (if the 343is outstanding. Modifying it can result in segfaults or World War III (if
330necessary/optional hardware is installed). 344the necessary/optional hardware is installed).
331 345
332Example: 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
333offset C<0> within the scalar: 347offset C<0> within the scalar:
334 348
335 aio_read $fh, 7, 15, $buffer, 0, sub { 349 aio_read $fh, 7, 15, $buffer, 0, sub {
336 $_[0] > 0 or die "read error: $!"; 350 $_[0] > 0 or die "read error: $!";
337 print "read $_[0] bytes: <$buffer>\n"; 351 print "read $_[0] bytes: <$buffer>\n";
338 }; 352 };
353
339 354
340=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)
341 356
342Tries 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
343reading 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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357C<$in_fh> than are written, and there is no way to find out how many 372C<$in_fh> than are written, and there is no way to find out how many
358bytes 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
359provides 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
360value 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
361read. 376read.
377
362 378
363=item aio_readahead $fh,$offset,$length, $callback->($retval) 379=item aio_readahead $fh,$offset,$length, $callback->($retval)
364 380
365C<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
366subsequent 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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372file. The current file offset of the file is left unchanged. 388file. The current file offset of the file is left unchanged.
373 389
374If 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
375emulated by simply reading the data, which would have a similar effect. 391emulated by simply reading the data, which would have a similar effect.
376 392
393
377=item aio_stat $fh_or_path, $callback->($status) 394=item aio_stat $fh_or_path, $callback->($status)
378 395
379=item aio_lstat $fh, $callback->($status) 396=item aio_lstat $fh, $callback->($status)
380 397
381Works 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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394 aio_stat "/etc/passwd", sub { 411 aio_stat "/etc/passwd", sub {
395 $_[0] and die "stat failed: $!"; 412 $_[0] and die "stat failed: $!";
396 print "size is ", -s _, "\n"; 413 print "size is ", -s _, "\n";
397 }; 414 };
398 415
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
399=item aio_unlink $pathname, $callback->($status) 458=item aio_unlink $pathname, $callback->($status)
400 459
401Asynchronously unlink (delete) a file and call the callback with the 460Asynchronously unlink (delete) a file and call the callback with the
402result code. 461result code.
403 462
463
404=item aio_mknod $path, $mode, $dev, $callback->($status) 464=item aio_mknod $path, $mode, $dev, $callback->($status)
405 465
406[EXPERIMENTAL] 466[EXPERIMENTAL]
407 467
408Asynchronously create a device node (or fifo). See mknod(2). 468Asynchronously create a device node (or fifo). See mknod(2).
409 469
410The only (POSIX-) portable way of calling this function is: 470The only (POSIX-) portable way of calling this function is:
411 471
412 aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ... 472 aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ...
473
413 474
414=item aio_link $srcpath, $dstpath, $callback->($status) 475=item aio_link $srcpath, $dstpath, $callback->($status)
415 476
416Asynchronously 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
417the path C<$dstpath> and call the callback with the result code. 478the path C<$dstpath> and call the callback with the result code.
418 479
480
419=item aio_symlink $srcpath, $dstpath, $callback->($status) 481=item aio_symlink $srcpath, $dstpath, $callback->($status)
420 482
421Asynchronously 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
422the path C<$dstpath> and call the callback with the result code. 484the path C<$dstpath> and call the callback with the result code.
485
423 486
424=item aio_readlink $path, $callback->($link) 487=item aio_readlink $path, $callback->($link)
425 488
426Asynchronously read the symlink specified by C<$path> and pass it to 489Asynchronously read the symlink specified by C<$path> and pass it to
427the callback. If an error occurs, nothing or undef gets passed to the 490the callback. If an error occurs, nothing or undef gets passed to the
428callback. 491callback.
429 492
493
430=item aio_rename $srcpath, $dstpath, $callback->($status) 494=item aio_rename $srcpath, $dstpath, $callback->($status)
431 495
432Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as 496Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as
433rename(2) and call the callback with the result code. 497rename(2) and call the callback with the result code.
434 498
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
435=item aio_rmdir $pathname, $callback->($status) 507=item aio_rmdir $pathname, $callback->($status)
436 508
437Asynchronously rmdir (delete) a directory and call the callback with the 509Asynchronously rmdir (delete) a directory and call the callback with the
438result code. 510result code.
511
439 512
440=item aio_readdir $pathname, $callback->($entries) 513=item aio_readdir $pathname, $callback->($entries)
441 514
442Unlike 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
443directory (i.e. opendir + readdir + closedir). The entries will not be 516directory (i.e. opendir + readdir + closedir). The entries will not be
444sorted, and will B<NOT> include the C<.> and C<..> entries. 517sorted, and will B<NOT> include the C<.> and C<..> entries.
445 518
446The 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
447with 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}
448 552
449=item aio_copy $srcpath, $dstpath, $callback->($status) 553=item aio_copy $srcpath, $dstpath, $callback->($status)
450 554
451Try 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
452destination) from C<$srcpath> to C<$dstpath> and call the callback with 556destination) from C<$srcpath> to C<$dstpath> and call the callback with
… …
462errors are being ignored. 566errors are being ignored.
463 567
464=cut 568=cut
465 569
466sub aio_copy($$;$) { 570sub aio_copy($$;$) {
571 aio_block {
467 my ($src, $dst, $cb) = @_; 572 my ($src, $dst, $cb) = @_;
468 573
469 my $pri = aioreq_pri; 574 my $pri = aioreq_pri;
470 my $grp = aio_group $cb; 575 my $grp = aio_group $cb;
471 576
472 aioreq_pri $pri; 577 aioreq_pri $pri;
473 add $grp aio_open $src, O_RDONLY, 0, sub { 578 add $grp aio_open $src, O_RDONLY, 0, sub {
474 if (my $src_fh = $_[0]) { 579 if (my $src_fh = $_[0]) {
475 my @stat = stat $src_fh; 580 my @stat = stat $src_fh;
476 581
477 aioreq_pri $pri; 582 aioreq_pri $pri;
478 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 {
479 if (my $dst_fh = $_[0]) { 584 if (my $dst_fh = $_[0]) {
480 aioreq_pri $pri; 585 aioreq_pri $pri;
481 add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { 586 add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {
482 if ($_[0] == $stat[7]) { 587 if ($_[0] == $stat[7]) {
483 $grp->result (0); 588 $grp->result (0);
484 close $src_fh; 589 close $src_fh;
485 590
486 # those should not normally block. should. should. 591 # those should not normally block. should. should.
487 utime $stat[8], $stat[9], $dst; 592 utime $stat[8], $stat[9], $dst;
488 chmod $stat[2] & 07777, $dst_fh; 593 chmod $stat[2] & 07777, $dst_fh;
489 chown $stat[4], $stat[5], $dst_fh; 594 chown $stat[4], $stat[5], $dst_fh;
490 close $dst_fh; 595 close $dst_fh;
491 } else { 596 } else {
492 $grp->result (-1); 597 $grp->result (-1);
493 close $src_fh; 598 close $src_fh;
494 close $dst_fh; 599 close $dst_fh;
495 600
496 aioreq $pri; 601 aioreq $pri;
497 add $grp aio_unlink $dst; 602 add $grp aio_unlink $dst;
603 }
498 } 604 };
605 } else {
606 $grp->result (-1);
499 }; 607 }
500 } else {
501 $grp->result (-1);
502 } 608 },
609
610 } else {
611 $grp->result (-1);
503 }, 612 }
504
505 } else {
506 $grp->result (-1);
507 } 613 };
614
615 $grp
508 }; 616 }
509
510 $grp
511} 617}
512 618
513=item aio_move $srcpath, $dstpath, $callback->($status) 619=item aio_move $srcpath, $dstpath, $callback->($status)
514 620
515Try 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
… …
521that is successful, unlinking the C<$srcpath>. 627that is successful, unlinking the C<$srcpath>.
522 628
523=cut 629=cut
524 630
525sub aio_move($$;$) { 631sub aio_move($$;$) {
632 aio_block {
526 my ($src, $dst, $cb) = @_; 633 my ($src, $dst, $cb) = @_;
527 634
528 my $pri = aioreq_pri; 635 my $pri = aioreq_pri;
529 my $grp = aio_group $cb; 636 my $grp = aio_group $cb;
530 637
531 aioreq_pri $pri; 638 aioreq_pri $pri;
532 add $grp aio_rename $src, $dst, sub { 639 add $grp aio_rename $src, $dst, sub {
533 if ($_[0] && $! == EXDEV) { 640 if ($_[0] && $! == EXDEV) {
534 aioreq_pri $pri; 641 aioreq_pri $pri;
535 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 {
536 $grp->result ($_[0]); 651 $grp->result ($_[0]);
537
538 if (!$_[0]) {
539 aioreq_pri $pri;
540 add $grp aio_unlink $src;
541 }
542 }; 652 }
543 } else {
544 $grp->result ($_[0]);
545 } 653 };
654
655 $grp
546 }; 656 }
547
548 $grp
549} 657}
550 658
551=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) 659=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
552 660
553Scans a directory (similar to C<aio_readdir>) but additionally tries to 661Scans a directory (similar to C<aio_readdir>) but additionally tries to
… …
600as 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
601directory counting heuristic. 709directory counting heuristic.
602 710
603=cut 711=cut
604 712
605sub aio_scandir($$$) { 713sub aio_scandir($$;$) {
714 aio_block {
606 my ($path, $maxreq, $cb) = @_; 715 my ($path, $maxreq, $cb) = @_;
607 716
608 my $pri = aioreq_pri; 717 my $pri = aioreq_pri;
609 718
610 my $grp = aio_group $cb; 719 my $grp = aio_group $cb;
611 720
612 $maxreq = 4 if $maxreq <= 0; 721 $maxreq = 4 if $maxreq <= 0;
613 722
614 # stat once 723 # stat once
615 aioreq_pri $pri;
616 add $grp aio_stat $path, sub {
617 return $grp->result () if $_[0];
618 my $now = time;
619 my $hash1 = join ":", (stat _)[0,1,3,7,9];
620
621 # read the directory entries
622 aioreq_pri $pri; 724 aioreq_pri $pri;
623 add $grp aio_readdir $path, sub { 725 add $grp aio_stat $path, sub {
624 my $entries = shift
625 or return $grp->result (); 726 return $grp->result () if $_[0];
727 my $now = time;
728 my $hash1 = join ":", (stat _)[0,1,3,7,9];
626 729
627 # stat the dir another time 730 # read the directory entries
628 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;
629 add $grp aio_stat $path, sub { 738 add $grp aio_stat $path, sub {
630 my $hash2 = join ":", (stat _)[0,1,3,7,9]; 739 my $hash2 = join ":", (stat _)[0,1,3,7,9];
631 740
632 my $ndirs; 741 my $ndirs;
633 742
634 # take the slow route if anything looks fishy 743 # take the slow route if anything looks fishy
635 if ($hash1 ne $hash2 or (stat _)[9] == $now) { 744 if ($hash1 ne $hash2 or (stat _)[9] == $now) {
636 $ndirs = -1; 745 $ndirs = -1;
637 } else { 746 } else {
638 # if nlink == 2, we are finished 747 # if nlink == 2, we are finished
639 # on non-posix-fs's, we rely on nlink < 2 748 # on non-posix-fs's, we rely on nlink < 2
640 $ndirs = (stat _)[3] - 2 749 $ndirs = (stat _)[3] - 2
641 or return $grp->result ([], $entries); 750 or return $grp->result ([], $entries);
642 } 751 }
643 752
644 # sort into likely dirs and likely nondirs 753 # sort into likely dirs and likely nondirs
645 # dirs == files without ".", short entries first 754 # dirs == files without ".", short entries first
646 $entries = [map $_->[0], 755 $entries = [map $_->[0],
647 sort { $b->[1] cmp $a->[1] } 756 sort { $b->[1] cmp $a->[1] }
648 map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length], 757 map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],
649 @$entries]; 758 @$entries];
650 759
651 my (@dirs, @nondirs); 760 my (@dirs, @nondirs);
652 761
653 my $statgrp = add $grp aio_group sub { 762 my $statgrp = add $grp aio_group sub {
654 $grp->result (\@dirs, \@nondirs); 763 $grp->result (\@dirs, \@nondirs);
655 }; 764 };
656 765
657 limit $statgrp $maxreq; 766 limit $statgrp $maxreq;
658 feed $statgrp sub { 767 feed $statgrp sub {
659 return unless @$entries; 768 return unless @$entries;
660 my $entry = pop @$entries; 769 my $entry = pop @$entries;
661 770
662 aioreq_pri $pri; 771 aioreq_pri $pri;
663 add $statgrp aio_stat "$path/$entry/.", sub { 772 add $statgrp aio_stat "$path/$entry/.", sub {
664 if ($_[0] < 0) { 773 if ($_[0] < 0) {
665 push @nondirs, $entry; 774 push @nondirs, $entry;
666 } else { 775 } else {
667 # need to check for real directory 776 # need to check for real directory
668 aioreq_pri $pri; 777 aioreq_pri $pri;
669 add $statgrp aio_lstat "$path/$entry", sub { 778 add $statgrp aio_lstat "$path/$entry", sub {
670 if (-d _) { 779 if (-d _) {
671 push @dirs, $entry; 780 push @dirs, $entry;
672 781
673 unless (--$ndirs) { 782 unless (--$ndirs) {
674 push @nondirs, @$entries; 783 push @nondirs, @$entries;
675 feed $statgrp; 784 feed $statgrp;
785 }
786 } else {
787 push @nondirs, $entry;
676 } 788 }
677 } else {
678 push @nondirs, $entry;
679 } 789 }
680 } 790 }
681 } 791 };
682 }; 792 };
683 }; 793 };
684 }; 794 };
685 }; 795 };
796
797 $grp
686 }; 798 }
799}
687 800
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
688 $grp 834 $grp
835 }
689} 836}
690 837
691=item aio_fsync $fh, $callback->($status) 838=item aio_fsync $fh, $callback->($status)
692 839
693Asynchronously call fsync on the given filehandle and call the callback 840Asynchronously call fsync on the given filehandle and call the callback
… …
997Strictly equivalent to: 1144Strictly equivalent to:
998 1145
999 IO::AIO::poll_wait, IO::AIO::poll_cb 1146 IO::AIO::poll_wait, IO::AIO::poll_cb
1000 while IO::AIO::nreqs; 1147 while IO::AIO::nreqs;
1001 1148
1149=back
1150
1002=head3 CONTROLLING THE NUMBER OF THREADS 1151=head3 CONTROLLING THE NUMBER OF THREADS
1152
1153=over
1003 1154
1004=item IO::AIO::min_parallel $nthreads 1155=item IO::AIO::min_parallel $nthreads
1005 1156
1006Set the minimum number of AIO threads to C<$nthreads>. The current 1157Set the minimum number of AIO threads to C<$nthreads>. The current
1007default is C<8>, which means eight asynchronous operations can execute 1158default is C<8>, which means eight asynchronous operations can execute
… …
1066 1217
1067You can still queue as many requests as you want. Therefore, 1218You can still queue as many requests as you want. Therefore,
1068C<max_oustsanding> is mainly useful in simple scripts (with low values) or 1219C<max_oustsanding> is mainly useful in simple scripts (with low values) or
1069as a stop gap to shield against fatal memory overflow (with large values). 1220as a stop gap to shield against fatal memory overflow (with large values).
1070 1221
1222=back
1223
1071=head3 STATISTICAL INFORMATION 1224=head3 STATISTICAL INFORMATION
1225
1226=over
1072 1227
1073=item IO::AIO::nreqs 1228=item IO::AIO::nreqs
1074 1229
1075Returns the number of requests currently in the ready, execute or pending 1230Returns the number of requests currently in the ready, execute or pending
1076states (i.e. for which their callback has not been invoked yet). 1231states (i.e. for which their callback has not been invoked yet).
… …
1110 *$sym 1265 *$sym
1111} 1266}
1112 1267
1113min_parallel 8; 1268min_parallel 8;
1114 1269
1115END { 1270END { flush }
1116 min_parallel 1;
1117 flush;
1118};
1119 1271
11201; 12721;
1121 1273
1122=head2 FORK BEHAVIOUR 1274=head2 FORK BEHAVIOUR
1123 1275

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