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Revision 1.94 by root, Wed Nov 8 02:01:02 2006 UTC vs.
Revision 1.109 by root, Sun Jun 3 09:44:17 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);
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_chmod $fh_or_path, $mode, $callback->($status)
449
450Works like perl's C<chmod> function.
451
452
399=item aio_unlink $pathname, $callback->($status) 453=item aio_unlink $pathname, $callback->($status)
400 454
401Asynchronously unlink (delete) a file and call the callback with the 455Asynchronously unlink (delete) a file and call the callback with the
402result code. 456result code.
403 457
458
404=item aio_mknod $path, $mode, $dev, $callback->($status) 459=item aio_mknod $path, $mode, $dev, $callback->($status)
405 460
406[EXPERIMENTAL] 461[EXPERIMENTAL]
407 462
408Asynchronously create a device node (or fifo). See mknod(2). 463Asynchronously create a device node (or fifo). See mknod(2).
409 464
410The only (POSIX-) portable way of calling this function is: 465The only (POSIX-) portable way of calling this function is:
411 466
412 aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ... 467 aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ...
468
413 469
414=item aio_link $srcpath, $dstpath, $callback->($status) 470=item aio_link $srcpath, $dstpath, $callback->($status)
415 471
416Asynchronously create a new link to the existing object at C<$srcpath> at 472Asynchronously create a new link to the existing object at C<$srcpath> at
417the path C<$dstpath> and call the callback with the result code. 473the path C<$dstpath> and call the callback with the result code.
418 474
475
419=item aio_symlink $srcpath, $dstpath, $callback->($status) 476=item aio_symlink $srcpath, $dstpath, $callback->($status)
420 477
421Asynchronously create a new symbolic link to the existing object at C<$srcpath> at 478Asynchronously create a new symbolic link to the existing object at C<$srcpath> at
422the path C<$dstpath> and call the callback with the result code. 479the path C<$dstpath> and call the callback with the result code.
480
423 481
424=item aio_readlink $path, $callback->($link) 482=item aio_readlink $path, $callback->($link)
425 483
426Asynchronously read the symlink specified by C<$path> and pass it to 484Asynchronously read the symlink specified by C<$path> and pass it to
427the callback. If an error occurs, nothing or undef gets passed to the 485the callback. If an error occurs, nothing or undef gets passed to the
428callback. 486callback.
429 487
488
430=item aio_rename $srcpath, $dstpath, $callback->($status) 489=item aio_rename $srcpath, $dstpath, $callback->($status)
431 490
432Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as 491Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as
433rename(2) and call the callback with the result code. 492rename(2) and call the callback with the result code.
434 493
494
495=item aio_mkdir $pathname, $mode, $callback->($status)
496
497Asynchronously mkdir (create) a directory and call the callback with
498the result code. C<$mode> will be modified by the umask at the time the
499request is executed, so do not change your umask.
500
501
435=item aio_rmdir $pathname, $callback->($status) 502=item aio_rmdir $pathname, $callback->($status)
436 503
437Asynchronously rmdir (delete) a directory and call the callback with the 504Asynchronously rmdir (delete) a directory and call the callback with the
438result code. 505result code.
506
439 507
440=item aio_readdir $pathname, $callback->($entries) 508=item aio_readdir $pathname, $callback->($entries)
441 509
442Unlike the POSIX call of the same name, C<aio_readdir> reads an entire 510Unlike the POSIX call of the same name, C<aio_readdir> reads an entire
443directory (i.e. opendir + readdir + closedir). The entries will not be 511directory (i.e. opendir + readdir + closedir). The entries will not be
444sorted, and will B<NOT> include the C<.> and C<..> entries. 512sorted, and will B<NOT> include the C<.> and C<..> entries.
445 513
446The callback a single argument which is either C<undef> or an array-ref 514The callback a single argument which is either C<undef> or an array-ref
447with the filenames. 515with the filenames.
516
517
518=item aio_load $path, $data, $callback->($status)
519
520This is a composite request that tries to fully load the given file into
521memory. Status is the same as with aio_read.
522
523=cut
524
525sub aio_load($$;$) {
526 aio_block {
527 my ($path, undef, $cb) = @_;
528 my $data = \$_[1];
529
530 my $pri = aioreq_pri;
531 my $grp = aio_group $cb;
532
533 aioreq_pri $pri;
534 add $grp aio_open $path, O_RDONLY, 0, sub {
535 my $fh = shift
536 or return $grp->result (-1);
537
538 aioreq_pri $pri;
539 add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub {
540 $grp->result ($_[0]);
541 };
542 };
543
544 $grp
545 }
546}
448 547
449=item aio_copy $srcpath, $dstpath, $callback->($status) 548=item aio_copy $srcpath, $dstpath, $callback->($status)
450 549
451Try to copy the I<file> (directories not supported as either source or 550Try to copy the I<file> (directories not supported as either source or
452destination) from C<$srcpath> to C<$dstpath> and call the callback with 551destination) from C<$srcpath> to C<$dstpath> and call the callback with
… …
462errors are being ignored. 561errors are being ignored.
463 562
464=cut 563=cut
465 564
466sub aio_copy($$;$) { 565sub aio_copy($$;$) {
566 aio_block {
467 my ($src, $dst, $cb) = @_; 567 my ($src, $dst, $cb) = @_;
468 568
469 my $pri = aioreq_pri; 569 my $pri = aioreq_pri;
470 my $grp = aio_group $cb; 570 my $grp = aio_group $cb;
471 571
472 aioreq_pri $pri; 572 aioreq_pri $pri;
473 add $grp aio_open $src, O_RDONLY, 0, sub { 573 add $grp aio_open $src, O_RDONLY, 0, sub {
474 if (my $src_fh = $_[0]) { 574 if (my $src_fh = $_[0]) {
475 my @stat = stat $src_fh; 575 my @stat = stat $src_fh;
476 576
477 aioreq_pri $pri; 577 aioreq_pri $pri;
478 add $grp aio_open $dst, O_CREAT | O_WRONLY | O_TRUNC, 0200, sub { 578 add $grp aio_open $dst, O_CREAT | O_WRONLY | O_TRUNC, 0200, sub {
479 if (my $dst_fh = $_[0]) { 579 if (my $dst_fh = $_[0]) {
480 aioreq_pri $pri; 580 aioreq_pri $pri;
481 add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { 581 add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {
482 if ($_[0] == $stat[7]) { 582 if ($_[0] == $stat[7]) {
483 $grp->result (0); 583 $grp->result (0);
484 close $src_fh; 584 close $src_fh;
485 585
486 # those should not normally block. should. should. 586 # those should not normally block. should. should.
487 utime $stat[8], $stat[9], $dst; 587 utime $stat[8], $stat[9], $dst;
488 chmod $stat[2] & 07777, $dst_fh; 588 chmod $stat[2] & 07777, $dst_fh;
489 chown $stat[4], $stat[5], $dst_fh; 589 chown $stat[4], $stat[5], $dst_fh;
490 close $dst_fh; 590 close $dst_fh;
491 } else { 591 } else {
492 $grp->result (-1); 592 $grp->result (-1);
493 close $src_fh; 593 close $src_fh;
494 close $dst_fh; 594 close $dst_fh;
495 595
496 aioreq $pri; 596 aioreq $pri;
497 add $grp aio_unlink $dst; 597 add $grp aio_unlink $dst;
598 }
498 } 599 };
600 } else {
601 $grp->result (-1);
499 }; 602 }
500 } else {
501 $grp->result (-1);
502 } 603 },
604
605 } else {
606 $grp->result (-1);
503 }, 607 }
504
505 } else {
506 $grp->result (-1);
507 } 608 };
609
610 $grp
508 }; 611 }
509
510 $grp
511} 612}
512 613
513=item aio_move $srcpath, $dstpath, $callback->($status) 614=item aio_move $srcpath, $dstpath, $callback->($status)
514 615
515Try to move the I<file> (directories not supported as either source or 616Try to move the I<file> (directories not supported as either source or
… …
521that is successful, unlinking the C<$srcpath>. 622that is successful, unlinking the C<$srcpath>.
522 623
523=cut 624=cut
524 625
525sub aio_move($$;$) { 626sub aio_move($$;$) {
627 aio_block {
526 my ($src, $dst, $cb) = @_; 628 my ($src, $dst, $cb) = @_;
527 629
528 my $pri = aioreq_pri; 630 my $pri = aioreq_pri;
529 my $grp = aio_group $cb; 631 my $grp = aio_group $cb;
530 632
531 aioreq_pri $pri; 633 aioreq_pri $pri;
532 add $grp aio_rename $src, $dst, sub { 634 add $grp aio_rename $src, $dst, sub {
533 if ($_[0] && $! == EXDEV) { 635 if ($_[0] && $! == EXDEV) {
534 aioreq_pri $pri; 636 aioreq_pri $pri;
535 add $grp aio_copy $src, $dst, sub { 637 add $grp aio_copy $src, $dst, sub {
638 $grp->result ($_[0]);
639
640 if (!$_[0]) {
641 aioreq_pri $pri;
642 add $grp aio_unlink $src;
643 }
644 };
645 } else {
536 $grp->result ($_[0]); 646 $grp->result ($_[0]);
537
538 if (!$_[0]) {
539 aioreq_pri $pri;
540 add $grp aio_unlink $src;
541 }
542 }; 647 }
543 } else {
544 $grp->result ($_[0]);
545 } 648 };
649
650 $grp
546 }; 651 }
547
548 $grp
549} 652}
550 653
551=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) 654=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
552 655
553Scans a directory (similar to C<aio_readdir>) but additionally tries to 656Scans 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 703as those tend to return 0 or 1 as link counts, which disables the
601directory counting heuristic. 704directory counting heuristic.
602 705
603=cut 706=cut
604 707
605sub aio_scandir($$$) { 708sub aio_scandir($$;$) {
709 aio_block {
606 my ($path, $maxreq, $cb) = @_; 710 my ($path, $maxreq, $cb) = @_;
607 711
608 my $pri = aioreq_pri; 712 my $pri = aioreq_pri;
609 713
610 my $grp = aio_group $cb; 714 my $grp = aio_group $cb;
611 715
612 $maxreq = 4 if $maxreq <= 0; 716 $maxreq = 4 if $maxreq <= 0;
613 717
614 # stat once 718 # 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; 719 aioreq_pri $pri;
623 add $grp aio_readdir $path, sub { 720 add $grp aio_stat $path, sub {
624 my $entries = shift
625 or return $grp->result (); 721 return $grp->result () if $_[0];
722 my $now = time;
723 my $hash1 = join ":", (stat _)[0,1,3,7,9];
626 724
627 # stat the dir another time 725 # read the directory entries
628 aioreq_pri $pri; 726 aioreq_pri $pri;
727 add $grp aio_readdir $path, sub {
728 my $entries = shift
729 or return $grp->result ();
730
731 # stat the dir another time
732 aioreq_pri $pri;
629 add $grp aio_stat $path, sub { 733 add $grp aio_stat $path, sub {
630 my $hash2 = join ":", (stat _)[0,1,3,7,9]; 734 my $hash2 = join ":", (stat _)[0,1,3,7,9];
631 735
632 my $ndirs; 736 my $ndirs;
633 737
634 # take the slow route if anything looks fishy 738 # take the slow route if anything looks fishy
635 if ($hash1 ne $hash2 or (stat _)[9] == $now) { 739 if ($hash1 ne $hash2 or (stat _)[9] == $now) {
636 $ndirs = -1; 740 $ndirs = -1;
637 } else { 741 } else {
638 # if nlink == 2, we are finished 742 # if nlink == 2, we are finished
639 # on non-posix-fs's, we rely on nlink < 2 743 # on non-posix-fs's, we rely on nlink < 2
640 $ndirs = (stat _)[3] - 2 744 $ndirs = (stat _)[3] - 2
641 or return $grp->result ([], $entries); 745 or return $grp->result ([], $entries);
642 } 746 }
643 747
644 # sort into likely dirs and likely nondirs 748 # sort into likely dirs and likely nondirs
645 # dirs == files without ".", short entries first 749 # dirs == files without ".", short entries first
646 $entries = [map $_->[0], 750 $entries = [map $_->[0],
647 sort { $b->[1] cmp $a->[1] } 751 sort { $b->[1] cmp $a->[1] }
648 map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length], 752 map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],
649 @$entries]; 753 @$entries];
650 754
651 my (@dirs, @nondirs); 755 my (@dirs, @nondirs);
652 756
653 my $statgrp = add $grp aio_group sub { 757 my $statgrp = add $grp aio_group sub {
654 $grp->result (\@dirs, \@nondirs); 758 $grp->result (\@dirs, \@nondirs);
655 }; 759 };
656 760
657 limit $statgrp $maxreq; 761 limit $statgrp $maxreq;
658 feed $statgrp sub { 762 feed $statgrp sub {
659 return unless @$entries; 763 return unless @$entries;
660 my $entry = pop @$entries; 764 my $entry = pop @$entries;
661 765
662 aioreq_pri $pri; 766 aioreq_pri $pri;
663 add $statgrp aio_stat "$path/$entry/.", sub { 767 add $statgrp aio_stat "$path/$entry/.", sub {
664 if ($_[0] < 0) { 768 if ($_[0] < 0) {
665 push @nondirs, $entry; 769 push @nondirs, $entry;
666 } else { 770 } else {
667 # need to check for real directory 771 # need to check for real directory
668 aioreq_pri $pri; 772 aioreq_pri $pri;
669 add $statgrp aio_lstat "$path/$entry", sub { 773 add $statgrp aio_lstat "$path/$entry", sub {
670 if (-d _) { 774 if (-d _) {
671 push @dirs, $entry; 775 push @dirs, $entry;
672 776
673 unless (--$ndirs) { 777 unless (--$ndirs) {
674 push @nondirs, @$entries; 778 push @nondirs, @$entries;
675 feed $statgrp; 779 feed $statgrp;
780 }
781 } else {
782 push @nondirs, $entry;
676 } 783 }
677 } else {
678 push @nondirs, $entry;
679 } 784 }
680 } 785 }
681 } 786 };
682 }; 787 };
683 }; 788 };
684 }; 789 };
685 }; 790 };
791
792 $grp
686 }; 793 }
794}
687 795
796=item aio_rmtree $path, $callback->($status)
797
798Delete a directory tree starting (and including) C<$path>, return the
799status of the final C<rmdir> only. This is a composite request that
800uses C<aio_scandir> to recurse into and rmdir directories, and unlink
801everything else.
802
803=cut
804
805sub aio_rmtree;
806sub aio_rmtree($;$) {
807 aio_block {
808 my ($path, $cb) = @_;
809
810 my $pri = aioreq_pri;
811 my $grp = aio_group $cb;
812
813 aioreq_pri $pri;
814 add $grp aio_scandir $path, 0, sub {
815 my ($dirs, $nondirs) = @_;
816
817 my $dirgrp = aio_group sub {
818 add $grp aio_rmdir $path, sub {
819 $grp->result ($_[0]);
820 };
821 };
822
823 (aioreq_pri $pri), add $dirgrp aio_rmtree "$path/$_" for @$dirs;
824 (aioreq_pri $pri), add $dirgrp aio_unlink "$path/$_" for @$nondirs;
825
826 add $grp $dirgrp;
827 };
828
688 $grp 829 $grp
830 }
689} 831}
690 832
691=item aio_fsync $fh, $callback->($status) 833=item aio_fsync $fh, $callback->($status)
692 834
693Asynchronously call fsync on the given filehandle and call the callback 835Asynchronously call fsync on the given filehandle and call the callback
… …
997Strictly equivalent to: 1139Strictly equivalent to:
998 1140
999 IO::AIO::poll_wait, IO::AIO::poll_cb 1141 IO::AIO::poll_wait, IO::AIO::poll_cb
1000 while IO::AIO::nreqs; 1142 while IO::AIO::nreqs;
1001 1143
1144=back
1145
1002=head3 CONTROLLING THE NUMBER OF THREADS 1146=head3 CONTROLLING THE NUMBER OF THREADS
1147
1148=over
1003 1149
1004=item IO::AIO::min_parallel $nthreads 1150=item IO::AIO::min_parallel $nthreads
1005 1151
1006Set the minimum number of AIO threads to C<$nthreads>. The current 1152Set the minimum number of AIO threads to C<$nthreads>. The current
1007default is C<8>, which means eight asynchronous operations can execute 1153default is C<8>, which means eight asynchronous operations can execute
… …
1066 1212
1067You can still queue as many requests as you want. Therefore, 1213You can still queue as many requests as you want. Therefore,
1068C<max_oustsanding> is mainly useful in simple scripts (with low values) or 1214C<max_oustsanding> is mainly useful in simple scripts (with low values) or
1069as a stop gap to shield against fatal memory overflow (with large values). 1215as a stop gap to shield against fatal memory overflow (with large values).
1070 1216
1217=back
1218
1071=head3 STATISTICAL INFORMATION 1219=head3 STATISTICAL INFORMATION
1220
1221=over
1072 1222
1073=item IO::AIO::nreqs 1223=item IO::AIO::nreqs
1074 1224
1075Returns the number of requests currently in the ready, execute or pending 1225Returns the number of requests currently in the ready, execute or pending
1076states (i.e. for which their callback has not been invoked yet). 1226states (i.e. for which their callback has not been invoked yet).
… …
1110 *$sym 1260 *$sym
1111} 1261}
1112 1262
1113min_parallel 8; 1263min_parallel 8;
1114 1264
1115END { 1265END { flush }
1116 min_parallel 1;
1117 flush;
1118};
1119 1266
11201; 12671;
1121 1268
1122=head2 FORK BEHAVIOUR 1269=head2 FORK BEHAVIOUR
1123 1270

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