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Revision 1.92 by root, Wed Nov 8 01:57:42 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 most of this works on all types of file descriptors (for example 67While most of this works on all types of file descriptors (for
67sockets), using these functions on file descriptors that support 68example sockets), using these functions on file descriptors that
68nonblocking operation (again, sockets, pipes etc.) is very inefficient or 69support nonblocking operation (again, sockets, pipes etc.) is very
69might 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>
70for 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.
71into such an event loop itself.
72 72
73In this version, a number of threads are started that execute your 73In this version, a number of threads are started that execute your
74requests and signal their completion. You don't need thread support 74requests and signal their completion. You don't need thread support
75in 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
76to 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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78not 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
79files currently, for example), and they would only support aio_read and 79files currently, for example), and they would only support aio_read and
80aio_write, so the remaining functionality would have to be implemented 80aio_write, so the remaining functionality would have to be implemented
81using threads anyway. 81using threads anyway.
82 82
83Although the module will work with in the presence of other (Perl-) 83Although the module will work in the presence of other (Perl-) threads,
84threads, it is currently not reentrant in any way, so use appropriate 84it is currently not reentrant in any way, so use appropriate locking
85locking 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
86never call C<poll_cb> (or other C<aio_> functions) recursively. 86call C<poll_cb> (or other C<aio_> functions) recursively.
87 87
88=head2 EXAMPLE 88=head2 EXAMPLE
89 89
90This is a simple example that uses the Event module and loads 90This is a simple example that uses the Event module and loads
91F</etc/passwd> asynchronously: 91F</etc/passwd> asynchronously:
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99 poll => 'r', 99 poll => 'r',
100 cb => \&IO::AIO::poll_cb); 100 cb => \&IO::AIO::poll_cb);
101 101
102 # queue the request to open /etc/passwd 102 # queue the request to open /etc/passwd
103 aio_open "/etc/passwd", O_RDONLY, 0, sub { 103 aio_open "/etc/passwd", O_RDONLY, 0, sub {
104 my $fh = $_[0] 104 my $fh = shift
105 or die "error while opening: $!"; 105 or die "error while opening: $!";
106 106
107 # stat'ing filehandles is generally non-blocking 107 # stat'ing filehandles is generally non-blocking
108 my $size = -s $fh; 108 my $size = -s $fh;
109 109
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189use strict 'vars'; 189use strict 'vars';
190 190
191use base 'Exporter'; 191use base 'Exporter';
192 192
193BEGIN { 193BEGIN {
194 our $VERSION = '2.2'; 194 our $VERSION = '2.4';
195 195
196 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
197 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
198 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
199 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);
200 our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); 201 our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice aio_block));
201 our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush 202 our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush
202 min_parallel max_parallel max_idle 203 min_parallel max_parallel max_idle
203 nreqs nready npending nthreads 204 nreqs nready npending nthreads
204 max_poll_time max_poll_reqs); 205 max_poll_time max_poll_reqs);
205 206
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270 aio_read $_[0], ..., sub { 271 aio_read $_[0], ..., sub {
271 ... 272 ...
272 }; 273 };
273 }; 274 };
274 275
276
275=item aioreq_nice $pri_adjust 277=item aioreq_nice $pri_adjust
276 278
277Similar 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
278priority, so the effect is cumulative. 280priority, so the effect is cumulative.
281
279 282
280=item aio_open $pathname, $flags, $mode, $callback->($fh) 283=item aio_open $pathname, $flags, $mode, $callback->($fh)
281 284
282Asynchronously 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
283created filehandle for the file. 286created filehandle for the file.
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289list. They are the same as used by C<sysopen>. 292list. They are the same as used by C<sysopen>.
290 293
291Likewise, 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
292didn'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>,
293except 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,
294and C<0666> or C<0777> if you do). 297and C<0666> or C<0777> if you do). Note that the C<$mode> will be modified
298by the umask in effect then the request is being executed, so better never
299change the umask.
295 300
296Example: 301Example:
297 302
298 aio_open "/etc/passwd", O_RDONLY, 0, sub { 303 aio_open "/etc/passwd", O_RDONLY, 0, sub {
299 if ($_[0]) { 304 if ($_[0]) {
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302 } else { 307 } else {
303 die "open failed: $!\n"; 308 die "open failed: $!\n";
304 } 309 }
305 }; 310 };
306 311
312
307=item aio_close $fh, $callback->($status) 313=item aio_close $fh, $callback->($status)
308 314
309Asynchronously close a file and call the callback with the result 315Asynchronously close a file and call the callback with the result
310code. I<WARNING:> although accepted, you should not pass in a perl 316code. I<WARNING:> although accepted, you should not pass in a perl
311filehandle 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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313C<close> or just let filehandles go out of scope. 319C<close> or just let filehandles go out of scope.
314 320
315This 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
316therefore best to avoid this function. 322therefore best to avoid this function.
317 323
324
318=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) 325=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
319 326
320=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) 327=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
321 328
322Reads 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<$offset>
323into the scalar given by C<data> and offset C<dataoffset> and calls the 330into the scalar given by C<$data> and offset C<$dataoffset> and calls the
324callback without the actual number of bytes read (or -1 on error, just 331callback without the actual number of bytes read (or -1 on error, just
325like the syscall). 332like the syscall).
326 333
334If C<$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
327The 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
328is outstanding. Modifying it can result in segfaults or WW3 (if the 343is outstanding. Modifying it can result in segfaults or World War III (if
329necessary/optional hardware is installed). 344the necessary/optional hardware is installed).
330 345
331Example: 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
332offset C<0> within the scalar: 347offset C<0> within the scalar:
333 348
334 aio_read $fh, 7, 15, $buffer, 0, sub { 349 aio_read $fh, 7, 15, $buffer, 0, sub {
335 $_[0] > 0 or die "read error: $!"; 350 $_[0] > 0 or die "read error: $!";
336 print "read $_[0] bytes: <$buffer>\n"; 351 print "read $_[0] bytes: <$buffer>\n";
337 }; 352 };
353
338 354
339=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)
340 356
341Tries 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
342reading 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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356C<$in_fh> than are written, and there is no way to find out how many 372C<$in_fh> than are written, and there is no way to find out how many
357bytes 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
358provides 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
359value 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
360read. 376read.
377
361 378
362=item aio_readahead $fh,$offset,$length, $callback->($retval) 379=item aio_readahead $fh,$offset,$length, $callback->($retval)
363 380
364C<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
365subsequent 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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371file. The current file offset of the file is left unchanged. 388file. The current file offset of the file is left unchanged.
372 389
373If 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
374emulated by simply reading the data, which would have a similar effect. 391emulated by simply reading the data, which would have a similar effect.
375 392
393
376=item aio_stat $fh_or_path, $callback->($status) 394=item aio_stat $fh_or_path, $callback->($status)
377 395
378=item aio_lstat $fh, $callback->($status) 396=item aio_lstat $fh, $callback->($status)
379 397
380Works 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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393 aio_stat "/etc/passwd", sub { 411 aio_stat "/etc/passwd", sub {
394 $_[0] and die "stat failed: $!"; 412 $_[0] and die "stat failed: $!";
395 print "size is ", -s _, "\n"; 413 print "size is ", -s _, "\n";
396 }; 414 };
397 415
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
398=item aio_unlink $pathname, $callback->($status) 458=item aio_unlink $pathname, $callback->($status)
399 459
400Asynchronously unlink (delete) a file and call the callback with the 460Asynchronously unlink (delete) a file and call the callback with the
401result code. 461result code.
402 462
463
403=item aio_mknod $path, $mode, $dev, $callback->($status) 464=item aio_mknod $path, $mode, $dev, $callback->($status)
404 465
405[EXPERIMENTAL] 466[EXPERIMENTAL]
406 467
407Asynchronously create a device node (or fifo). See mknod(2). 468Asynchronously create a device node (or fifo). See mknod(2).
408 469
409The only (POSIX-) portable way of calling this function is: 470The only (POSIX-) portable way of calling this function is:
410 471
411 aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ... 472 aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ...
473
412 474
413=item aio_link $srcpath, $dstpath, $callback->($status) 475=item aio_link $srcpath, $dstpath, $callback->($status)
414 476
415Asynchronously 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
416the path C<$dstpath> and call the callback with the result code. 478the path C<$dstpath> and call the callback with the result code.
417 479
480
418=item aio_symlink $srcpath, $dstpath, $callback->($status) 481=item aio_symlink $srcpath, $dstpath, $callback->($status)
419 482
420Asynchronously 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
421the path C<$dstpath> and call the callback with the result code. 484the path C<$dstpath> and call the callback with the result code.
485
422 486
423=item aio_readlink $path, $callback->($link) 487=item aio_readlink $path, $callback->($link)
424 488
425Asynchronously read the symlink specified by C<$path> and pass it to 489Asynchronously read the symlink specified by C<$path> and pass it to
426the 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
427callback. 491callback.
428 492
493
429=item aio_rename $srcpath, $dstpath, $callback->($status) 494=item aio_rename $srcpath, $dstpath, $callback->($status)
430 495
431Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as 496Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as
432rename(2) and call the callback with the result code. 497rename(2) and call the callback with the result code.
433 498
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
434=item aio_rmdir $pathname, $callback->($status) 507=item aio_rmdir $pathname, $callback->($status)
435 508
436Asynchronously rmdir (delete) a directory and call the callback with the 509Asynchronously rmdir (delete) a directory and call the callback with the
437result code. 510result code.
511
438 512
439=item aio_readdir $pathname, $callback->($entries) 513=item aio_readdir $pathname, $callback->($entries)
440 514
441Unlike 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
442directory (i.e. opendir + readdir + closedir). The entries will not be 516directory (i.e. opendir + readdir + closedir). The entries will not be
443sorted, and will B<NOT> include the C<.> and C<..> entries. 517sorted, and will B<NOT> include the C<.> and C<..> entries.
444 518
445The 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
446with 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}
447 552
448=item aio_copy $srcpath, $dstpath, $callback->($status) 553=item aio_copy $srcpath, $dstpath, $callback->($status)
449 554
450Try 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
451destination) from C<$srcpath> to C<$dstpath> and call the callback with 556destination) from C<$srcpath> to C<$dstpath> and call the callback with
… …
461errors are being ignored. 566errors are being ignored.
462 567
463=cut 568=cut
464 569
465sub aio_copy($$;$) { 570sub aio_copy($$;$) {
571 aio_block {
466 my ($src, $dst, $cb) = @_; 572 my ($src, $dst, $cb) = @_;
467 573
468 my $pri = aioreq_pri; 574 my $pri = aioreq_pri;
469 my $grp = aio_group $cb; 575 my $grp = aio_group $cb;
470 576
471 aioreq_pri $pri; 577 aioreq_pri $pri;
472 add $grp aio_open $src, O_RDONLY, 0, sub { 578 add $grp aio_open $src, O_RDONLY, 0, sub {
473 if (my $src_fh = $_[0]) { 579 if (my $src_fh = $_[0]) {
474 my @stat = stat $src_fh; 580 my @stat = stat $src_fh;
475 581
476 aioreq_pri $pri; 582 aioreq_pri $pri;
477 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 {
478 if (my $dst_fh = $_[0]) { 584 if (my $dst_fh = $_[0]) {
479 aioreq_pri $pri; 585 aioreq_pri $pri;
480 add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { 586 add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {
481 if ($_[0] == $stat[7]) { 587 if ($_[0] == $stat[7]) {
482 $grp->result (0); 588 $grp->result (0);
483 close $src_fh; 589 close $src_fh;
484 590
485 # those should not normally block. should. should. 591 # those should not normally block. should. should.
486 utime $stat[8], $stat[9], $dst; 592 utime $stat[8], $stat[9], $dst;
487 chmod $stat[2] & 07777, $dst_fh; 593 chmod $stat[2] & 07777, $dst_fh;
488 chown $stat[4], $stat[5], $dst_fh; 594 chown $stat[4], $stat[5], $dst_fh;
489 close $dst_fh; 595 close $dst_fh;
490 } else { 596 } else {
491 $grp->result (-1); 597 $grp->result (-1);
492 close $src_fh; 598 close $src_fh;
493 close $dst_fh; 599 close $dst_fh;
494 600
495 aioreq $pri; 601 aioreq $pri;
496 add $grp aio_unlink $dst; 602 add $grp aio_unlink $dst;
603 }
497 } 604 };
605 } else {
606 $grp->result (-1);
498 }; 607 }
499 } else {
500 $grp->result (-1);
501 } 608 },
609
610 } else {
611 $grp->result (-1);
502 }, 612 }
503
504 } else {
505 $grp->result (-1);
506 } 613 };
614
615 $grp
507 }; 616 }
508
509 $grp
510} 617}
511 618
512=item aio_move $srcpath, $dstpath, $callback->($status) 619=item aio_move $srcpath, $dstpath, $callback->($status)
513 620
514Try 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
… …
520that is successful, unlinking the C<$srcpath>. 627that is successful, unlinking the C<$srcpath>.
521 628
522=cut 629=cut
523 630
524sub aio_move($$;$) { 631sub aio_move($$;$) {
632 aio_block {
525 my ($src, $dst, $cb) = @_; 633 my ($src, $dst, $cb) = @_;
526 634
527 my $pri = aioreq_pri; 635 my $pri = aioreq_pri;
528 my $grp = aio_group $cb; 636 my $grp = aio_group $cb;
529 637
530 aioreq_pri $pri; 638 aioreq_pri $pri;
531 add $grp aio_rename $src, $dst, sub { 639 add $grp aio_rename $src, $dst, sub {
532 if ($_[0] && $! == EXDEV) { 640 if ($_[0] && $! == EXDEV) {
533 aioreq_pri $pri; 641 aioreq_pri $pri;
534 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 {
535 $grp->result ($_[0]); 651 $grp->result ($_[0]);
536
537 if (!$_[0]) {
538 aioreq_pri $pri;
539 add $grp aio_unlink $src;
540 }
541 }; 652 }
542 } else {
543 $grp->result ($_[0]);
544 } 653 };
654
655 $grp
545 }; 656 }
546
547 $grp
548} 657}
549 658
550=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) 659=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
551 660
552Scans a directory (similar to C<aio_readdir>) but additionally tries to 661Scans a directory (similar to C<aio_readdir>) but additionally tries to
… …
599as 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
600directory counting heuristic. 709directory counting heuristic.
601 710
602=cut 711=cut
603 712
604sub aio_scandir($$$) { 713sub aio_scandir($$;$) {
714 aio_block {
605 my ($path, $maxreq, $cb) = @_; 715 my ($path, $maxreq, $cb) = @_;
606 716
607 my $pri = aioreq_pri; 717 my $pri = aioreq_pri;
608 718
609 my $grp = aio_group $cb; 719 my $grp = aio_group $cb;
610 720
611 $maxreq = 4 if $maxreq <= 0; 721 $maxreq = 4 if $maxreq <= 0;
612 722
613 # stat once 723 # stat once
614 aioreq_pri $pri;
615 add $grp aio_stat $path, sub {
616 return $grp->result () if $_[0];
617 my $now = time;
618 my $hash1 = join ":", (stat _)[0,1,3,7,9];
619
620 # read the directory entries
621 aioreq_pri $pri; 724 aioreq_pri $pri;
622 add $grp aio_readdir $path, sub { 725 add $grp aio_stat $path, sub {
623 my $entries = shift
624 or return $grp->result (); 726 return $grp->result () if $_[0];
727 my $now = time;
728 my $hash1 = join ":", (stat _)[0,1,3,7,9];
625 729
626 # stat the dir another time 730 # read the directory entries
627 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;
628 add $grp aio_stat $path, sub { 738 add $grp aio_stat $path, sub {
629 my $hash2 = join ":", (stat _)[0,1,3,7,9]; 739 my $hash2 = join ":", (stat _)[0,1,3,7,9];
630 740
631 my $ndirs; 741 my $ndirs;
632 742
633 # take the slow route if anything looks fishy 743 # take the slow route if anything looks fishy
634 if ($hash1 ne $hash2 or (stat _)[9] == $now) { 744 if ($hash1 ne $hash2 or (stat _)[9] == $now) {
635 $ndirs = -1; 745 $ndirs = -1;
636 } else { 746 } else {
637 # if nlink == 2, we are finished 747 # if nlink == 2, we are finished
638 # on non-posix-fs's, we rely on nlink < 2 748 # on non-posix-fs's, we rely on nlink < 2
639 $ndirs = (stat _)[3] - 2 749 $ndirs = (stat _)[3] - 2
640 or return $grp->result ([], $entries); 750 or return $grp->result ([], $entries);
641 } 751 }
642 752
643 # sort into likely dirs and likely nondirs 753 # sort into likely dirs and likely nondirs
644 # dirs == files without ".", short entries first 754 # dirs == files without ".", short entries first
645 $entries = [map $_->[0], 755 $entries = [map $_->[0],
646 sort { $b->[1] cmp $a->[1] } 756 sort { $b->[1] cmp $a->[1] }
647 map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length], 757 map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],
648 @$entries]; 758 @$entries];
649 759
650 my (@dirs, @nondirs); 760 my (@dirs, @nondirs);
651 761
652 my $statgrp = add $grp aio_group sub { 762 my $statgrp = add $grp aio_group sub {
653 $grp->result (\@dirs, \@nondirs); 763 $grp->result (\@dirs, \@nondirs);
654 }; 764 };
655 765
656 limit $statgrp $maxreq; 766 limit $statgrp $maxreq;
657 feed $statgrp sub { 767 feed $statgrp sub {
658 return unless @$entries; 768 return unless @$entries;
659 my $entry = pop @$entries; 769 my $entry = pop @$entries;
660 770
661 aioreq_pri $pri; 771 aioreq_pri $pri;
662 add $statgrp aio_stat "$path/$entry/.", sub { 772 add $statgrp aio_stat "$path/$entry/.", sub {
663 if ($_[0] < 0) { 773 if ($_[0] < 0) {
664 push @nondirs, $entry; 774 push @nondirs, $entry;
665 } else { 775 } else {
666 # need to check for real directory 776 # need to check for real directory
667 aioreq_pri $pri; 777 aioreq_pri $pri;
668 add $statgrp aio_lstat "$path/$entry", sub { 778 add $statgrp aio_lstat "$path/$entry", sub {
669 if (-d _) { 779 if (-d _) {
670 push @dirs, $entry; 780 push @dirs, $entry;
671 781
672 unless (--$ndirs) { 782 unless (--$ndirs) {
673 push @nondirs, @$entries; 783 push @nondirs, @$entries;
674 feed $statgrp; 784 feed $statgrp;
785 }
786 } else {
787 push @nondirs, $entry;
675 } 788 }
676 } else {
677 push @nondirs, $entry;
678 } 789 }
679 } 790 }
680 } 791 };
681 }; 792 };
682 }; 793 };
683 }; 794 };
684 }; 795 };
796
797 $grp
685 }; 798 }
799}
686 800
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
687 $grp 834 $grp
835 }
688} 836}
689 837
690=item aio_fsync $fh, $callback->($status) 838=item aio_fsync $fh, $callback->($status)
691 839
692Asynchronously call fsync on the given filehandle and call the callback 840Asynchronously call fsync on the given filehandle and call the callback
… …
971 poll => 'r', nice => 1, 1119 poll => 'r', nice => 1,
972 cb => &IO::AIO::poll_cb); 1120 cb => &IO::AIO::poll_cb);
973 1121
974=item IO::AIO::poll_wait 1122=item IO::AIO::poll_wait
975 1123
976If there are any outstanding requests, wait till the result filehandle 1124If there are any outstanding requests and none of them in the result
977becomes ready for reading (simply does a C<select> on the filehandle. This 1125phase, wait till the result filehandle becomes ready for reading (simply
1126does a C<select> on the filehandle. This is useful if you want to
978is useful if you want to synchronously wait for some requests to finish). 1127synchronously wait for some requests to finish).
979 1128
980See C<nreqs> for an example. 1129See C<nreqs> for an example.
981 1130
982=item IO::AIO::poll 1131=item IO::AIO::poll
983 1132
… …
985 1134
986Returns the number of requests processed, but is otherwise strictly 1135Returns the number of requests processed, but is otherwise strictly
987equivalent to: 1136equivalent to:
988 1137
989 IO::AIO::poll_wait, IO::AIO::poll_cb 1138 IO::AIO::poll_wait, IO::AIO::poll_cb
990 if IO::AIO::nreqs;
991 1139
992=item IO::AIO::flush 1140=item IO::AIO::flush
993 1141
994Wait till all outstanding AIO requests have been handled. 1142Wait till all outstanding AIO requests have been handled.
995 1143
996Strictly equivalent to: 1144Strictly equivalent to:
997 1145
998 IO::AIO::poll_wait, IO::AIO::poll_cb 1146 IO::AIO::poll_wait, IO::AIO::poll_cb
999 while IO::AIO::nreqs; 1147 while IO::AIO::nreqs;
1000 1148
1149=back
1150
1001=head3 CONTROLLING THE NUMBER OF THREADS 1151=head3 CONTROLLING THE NUMBER OF THREADS
1152
1153=over
1002 1154
1003=item IO::AIO::min_parallel $nthreads 1155=item IO::AIO::min_parallel $nthreads
1004 1156
1005Set the minimum number of AIO threads to C<$nthreads>. The current 1157Set the minimum number of AIO threads to C<$nthreads>. The current
1006default is C<8>, which means eight asynchronous operations can execute 1158default is C<8>, which means eight asynchronous operations can execute
… …
1065 1217
1066You can still queue as many requests as you want. Therefore, 1218You can still queue as many requests as you want. Therefore,
1067C<max_oustsanding> is mainly useful in simple scripts (with low values) or 1219C<max_oustsanding> is mainly useful in simple scripts (with low values) or
1068as a stop gap to shield against fatal memory overflow (with large values). 1220as a stop gap to shield against fatal memory overflow (with large values).
1069 1221
1222=back
1223
1070=head3 STATISTICAL INFORMATION 1224=head3 STATISTICAL INFORMATION
1225
1226=over
1071 1227
1072=item IO::AIO::nreqs 1228=item IO::AIO::nreqs
1073 1229
1074Returns the number of requests currently in the ready, execute or pending 1230Returns the number of requests currently in the ready, execute or pending
1075states (i.e. for which their callback has not been invoked yet). 1231states (i.e. for which their callback has not been invoked yet).
… …
1109 *$sym 1265 *$sym
1110} 1266}
1111 1267
1112min_parallel 8; 1268min_parallel 8;
1113 1269
1114END { 1270END { flush }
1115 min_parallel 1;
1116 flush;
1117};
1118 1271
11191; 12721;
1120 1273
1121=head2 FORK BEHAVIOUR 1274=head2 FORK BEHAVIOUR
1122 1275

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