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Revision 1.88 by root, Sun Oct 29 01:50:29 2006 UTC vs.
Revision 1.109 by root, Sun Jun 3 09:44:17 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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188use strict 'vars'; 189use strict 'vars';
189 190
190use base 'Exporter'; 191use base 'Exporter';
191 192
192BEGIN { 193BEGIN {
193 our $VERSION = '2.1'; 194 our $VERSION = '2.4';
194 195
195 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
196 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
197 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
199 aio_move aio_copy aio_group aio_nop aio_mknod aio_load aio_rmtree aio_mkdir
198 aio_copy aio_group aio_nop aio_mknod); 200 aio_chown aio_chmod aio_utime);
199 our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); 201 our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice aio_block));
200 our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush 202 our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush
201 min_parallel max_parallel max_idle 203 min_parallel max_parallel max_idle
202 nreqs nready npending nthreads 204 nreqs nready npending nthreads
203 max_poll_time max_poll_reqs); 205 max_poll_time max_poll_reqs);
204 206
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269 aio_read $_[0], ..., sub { 271 aio_read $_[0], ..., sub {
270 ... 272 ...
271 }; 273 };
272 }; 274 };
273 275
276
274=item aioreq_nice $pri_adjust 277=item aioreq_nice $pri_adjust
275 278
276Similar 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
277priority, so the effect is cumulative. 280priority, so the effect is cumulative.
281
278 282
279=item aio_open $pathname, $flags, $mode, $callback->($fh) 283=item aio_open $pathname, $flags, $mode, $callback->($fh)
280 284
281Asynchronously 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
282created filehandle for the file. 286created filehandle for the file.
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288list. They are the same as used by C<sysopen>. 292list. They are the same as used by C<sysopen>.
289 293
290Likewise, 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
291didn'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>,
292except 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,
293and C<0666> or C<0777> if you do). 297and C<0666> or C<0777> if you do). Note that the C<$mode> will be modified
298by the umask in effect then the request is being executed, so better never
299change the umask.
294 300
295Example: 301Example:
296 302
297 aio_open "/etc/passwd", O_RDONLY, 0, sub { 303 aio_open "/etc/passwd", O_RDONLY, 0, sub {
298 if ($_[0]) { 304 if ($_[0]) {
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301 } else { 307 } else {
302 die "open failed: $!\n"; 308 die "open failed: $!\n";
303 } 309 }
304 }; 310 };
305 311
312
306=item aio_close $fh, $callback->($status) 313=item aio_close $fh, $callback->($status)
307 314
308Asynchronously close a file and call the callback with the result 315Asynchronously close a file and call the callback with the result
309code. I<WARNING:> although accepted, you should not pass in a perl 316code. I<WARNING:> although accepted, you should not pass in a perl
310filehandle 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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312C<close> or just let filehandles go out of scope. 319C<close> or just let filehandles go out of scope.
313 320
314This 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
315therefore best to avoid this function. 322therefore best to avoid this function.
316 323
324
317=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) 325=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
318 326
319=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) 327=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
320 328
321Reads 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<$offset>
322into the scalar given by C<data> and offset C<dataoffset> and calls the 330into the scalar given by C<$data> and offset C<$dataoffset> and calls the
323callback without the actual number of bytes read (or -1 on error, just 331callback without the actual number of bytes read (or -1 on error, just
324like the syscall). 332like the syscall).
325 333
334If C<$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
326The 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
327is outstanding. Modifying it can result in segfaults or WW3 (if the 343is outstanding. Modifying it can result in segfaults or World War III (if
328necessary/optional hardware is installed). 344the necessary/optional hardware is installed).
329 345
330Example: 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
331offset C<0> within the scalar: 347offset C<0> within the scalar:
332 348
333 aio_read $fh, 7, 15, $buffer, 0, sub { 349 aio_read $fh, 7, 15, $buffer, 0, sub {
334 $_[0] > 0 or die "read error: $!"; 350 $_[0] > 0 or die "read error: $!";
335 print "read $_[0] bytes: <$buffer>\n"; 351 print "read $_[0] bytes: <$buffer>\n";
336 }; 352 };
353
337 354
338=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)
339 356
340Tries 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
341reading 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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355C<$in_fh> than are written, and there is no way to find out how many 372C<$in_fh> than are written, and there is no way to find out how many
356bytes 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
357provides 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
358value 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
359read. 376read.
377
360 378
361=item aio_readahead $fh,$offset,$length, $callback->($retval) 379=item aio_readahead $fh,$offset,$length, $callback->($retval)
362 380
363C<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
364subsequent 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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370file. The current file offset of the file is left unchanged. 388file. The current file offset of the file is left unchanged.
371 389
372If 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
373emulated by simply reading the data, which would have a similar effect. 391emulated by simply reading the data, which would have a similar effect.
374 392
393
375=item aio_stat $fh_or_path, $callback->($status) 394=item aio_stat $fh_or_path, $callback->($status)
376 395
377=item aio_lstat $fh, $callback->($status) 396=item aio_lstat $fh, $callback->($status)
378 397
379Works 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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392 aio_stat "/etc/passwd", sub { 411 aio_stat "/etc/passwd", sub {
393 $_[0] and die "stat failed: $!"; 412 $_[0] and die "stat failed: $!";
394 print "size is ", -s _, "\n"; 413 print "size is ", -s _, "\n";
395 }; 414 };
396 415
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
397=item aio_unlink $pathname, $callback->($status) 453=item aio_unlink $pathname, $callback->($status)
398 454
399Asynchronously unlink (delete) a file and call the callback with the 455Asynchronously unlink (delete) a file and call the callback with the
400result code. 456result code.
401 457
458
402=item aio_mknod $path, $mode, $dev, $callback->($status) 459=item aio_mknod $path, $mode, $dev, $callback->($status)
403 460
404[EXPERIMENTAL] 461[EXPERIMENTAL]
405 462
406Asynchronously create a device node (or fifo). See mknod(2). 463Asynchronously create a device node (or fifo). See mknod(2).
407 464
408The only (POSIX-) portable way of calling this function is: 465The only (POSIX-) portable way of calling this function is:
409 466
410 aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ... 467 aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ...
468
411 469
412=item aio_link $srcpath, $dstpath, $callback->($status) 470=item aio_link $srcpath, $dstpath, $callback->($status)
413 471
414Asynchronously 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
415the path C<$dstpath> and call the callback with the result code. 473the path C<$dstpath> and call the callback with the result code.
416 474
475
417=item aio_symlink $srcpath, $dstpath, $callback->($status) 476=item aio_symlink $srcpath, $dstpath, $callback->($status)
418 477
419Asynchronously 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
420the path C<$dstpath> and call the callback with the result code. 479the path C<$dstpath> and call the callback with the result code.
421 480
481
482=item aio_readlink $path, $callback->($link)
483
484Asynchronously read the symlink specified by C<$path> and pass it to
485the callback. If an error occurs, nothing or undef gets passed to the
486callback.
487
488
422=item aio_rename $srcpath, $dstpath, $callback->($status) 489=item aio_rename $srcpath, $dstpath, $callback->($status)
423 490
424Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as 491Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as
425rename(2) and call the callback with the result code. 492rename(2) and call the callback with the result code.
426 493
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
427=item aio_rmdir $pathname, $callback->($status) 502=item aio_rmdir $pathname, $callback->($status)
428 503
429Asynchronously rmdir (delete) a directory and call the callback with the 504Asynchronously rmdir (delete) a directory and call the callback with the
430result code. 505result code.
506
431 507
432=item aio_readdir $pathname, $callback->($entries) 508=item aio_readdir $pathname, $callback->($entries)
433 509
434Unlike 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
435directory (i.e. opendir + readdir + closedir). The entries will not be 511directory (i.e. opendir + readdir + closedir). The entries will not be
436sorted, and will B<NOT> include the C<.> and C<..> entries. 512sorted, and will B<NOT> include the C<.> and C<..> entries.
437 513
438The 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
439with 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}
440 547
441=item aio_copy $srcpath, $dstpath, $callback->($status) 548=item aio_copy $srcpath, $dstpath, $callback->($status)
442 549
443Try 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
444destination) from C<$srcpath> to C<$dstpath> and call the callback with 551destination) from C<$srcpath> to C<$dstpath> and call the callback with
… …
454errors are being ignored. 561errors are being ignored.
455 562
456=cut 563=cut
457 564
458sub aio_copy($$;$) { 565sub aio_copy($$;$) {
566 aio_block {
459 my ($src, $dst, $cb) = @_; 567 my ($src, $dst, $cb) = @_;
460 568
461 my $pri = aioreq_pri; 569 my $pri = aioreq_pri;
462 my $grp = aio_group $cb; 570 my $grp = aio_group $cb;
463 571
464 aioreq_pri $pri; 572 aioreq_pri $pri;
465 add $grp aio_open $src, O_RDONLY, 0, sub { 573 add $grp aio_open $src, O_RDONLY, 0, sub {
466 if (my $src_fh = $_[0]) { 574 if (my $src_fh = $_[0]) {
467 my @stat = stat $src_fh; 575 my @stat = stat $src_fh;
468 576
469 aioreq_pri $pri; 577 aioreq_pri $pri;
470 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 {
471 if (my $dst_fh = $_[0]) { 579 if (my $dst_fh = $_[0]) {
472 aioreq_pri $pri; 580 aioreq_pri $pri;
473 add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { 581 add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {
474 if ($_[0] == $stat[7]) { 582 if ($_[0] == $stat[7]) {
475 $grp->result (0); 583 $grp->result (0);
476 close $src_fh; 584 close $src_fh;
477 585
478 # those should not normally block. should. should. 586 # those should not normally block. should. should.
479 utime $stat[8], $stat[9], $dst; 587 utime $stat[8], $stat[9], $dst;
480 chmod $stat[2] & 07777, $dst_fh; 588 chmod $stat[2] & 07777, $dst_fh;
481 chown $stat[4], $stat[5], $dst_fh; 589 chown $stat[4], $stat[5], $dst_fh;
482 close $dst_fh; 590 close $dst_fh;
483 } else { 591 } else {
484 $grp->result (-1); 592 $grp->result (-1);
485 close $src_fh; 593 close $src_fh;
486 close $dst_fh; 594 close $dst_fh;
487 595
488 aioreq $pri; 596 aioreq $pri;
489 add $grp aio_unlink $dst; 597 add $grp aio_unlink $dst;
598 }
490 } 599 };
600 } else {
601 $grp->result (-1);
491 }; 602 }
492 } else {
493 $grp->result (-1);
494 } 603 },
604
605 } else {
606 $grp->result (-1);
495 }, 607 }
496
497 } else {
498 $grp->result (-1);
499 } 608 };
609
610 $grp
500 }; 611 }
501
502 $grp
503} 612}
504 613
505=item aio_move $srcpath, $dstpath, $callback->($status) 614=item aio_move $srcpath, $dstpath, $callback->($status)
506 615
507Try 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
… …
513that is successful, unlinking the C<$srcpath>. 622that is successful, unlinking the C<$srcpath>.
514 623
515=cut 624=cut
516 625
517sub aio_move($$;$) { 626sub aio_move($$;$) {
627 aio_block {
518 my ($src, $dst, $cb) = @_; 628 my ($src, $dst, $cb) = @_;
519 629
520 my $pri = aioreq_pri; 630 my $pri = aioreq_pri;
521 my $grp = aio_group $cb; 631 my $grp = aio_group $cb;
522 632
523 aioreq_pri $pri; 633 aioreq_pri $pri;
524 add $grp aio_rename $src, $dst, sub { 634 add $grp aio_rename $src, $dst, sub {
525 if ($_[0] && $! == EXDEV) { 635 if ($_[0] && $! == EXDEV) {
526 aioreq_pri $pri; 636 aioreq_pri $pri;
527 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 {
528 $grp->result ($_[0]); 646 $grp->result ($_[0]);
529
530 if (!$_[0]) {
531 aioreq_pri $pri;
532 add $grp aio_unlink $src;
533 }
534 }; 647 }
535 } else {
536 $grp->result ($_[0]);
537 } 648 };
649
650 $grp
538 }; 651 }
539
540 $grp
541} 652}
542 653
543=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) 654=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
544 655
545Scans a directory (similar to C<aio_readdir>) but additionally tries to 656Scans a directory (similar to C<aio_readdir>) but additionally tries to
… …
592as 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
593directory counting heuristic. 704directory counting heuristic.
594 705
595=cut 706=cut
596 707
597sub aio_scandir($$$) { 708sub aio_scandir($$;$) {
709 aio_block {
598 my ($path, $maxreq, $cb) = @_; 710 my ($path, $maxreq, $cb) = @_;
599 711
600 my $pri = aioreq_pri; 712 my $pri = aioreq_pri;
601 713
602 my $grp = aio_group $cb; 714 my $grp = aio_group $cb;
603 715
604 $maxreq = 4 if $maxreq <= 0; 716 $maxreq = 4 if $maxreq <= 0;
605 717
606 # stat once 718 # stat once
607 aioreq_pri $pri;
608 add $grp aio_stat $path, sub {
609 return $grp->result () if $_[0];
610 my $now = time;
611 my $hash1 = join ":", (stat _)[0,1,3,7,9];
612
613 # read the directory entries
614 aioreq_pri $pri; 719 aioreq_pri $pri;
615 add $grp aio_readdir $path, sub { 720 add $grp aio_stat $path, sub {
616 my $entries = shift
617 or return $grp->result (); 721 return $grp->result () if $_[0];
722 my $now = time;
723 my $hash1 = join ":", (stat _)[0,1,3,7,9];
618 724
619 # stat the dir another time 725 # read the directory entries
620 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;
621 add $grp aio_stat $path, sub { 733 add $grp aio_stat $path, sub {
622 my $hash2 = join ":", (stat _)[0,1,3,7,9]; 734 my $hash2 = join ":", (stat _)[0,1,3,7,9];
623 735
624 my $ndirs; 736 my $ndirs;
625 737
626 # take the slow route if anything looks fishy 738 # take the slow route if anything looks fishy
627 if ($hash1 ne $hash2 or (stat _)[9] == $now) { 739 if ($hash1 ne $hash2 or (stat _)[9] == $now) {
628 $ndirs = -1; 740 $ndirs = -1;
629 } else { 741 } else {
630 # if nlink == 2, we are finished 742 # if nlink == 2, we are finished
631 # on non-posix-fs's, we rely on nlink < 2 743 # on non-posix-fs's, we rely on nlink < 2
632 $ndirs = (stat _)[3] - 2 744 $ndirs = (stat _)[3] - 2
633 or return $grp->result ([], $entries); 745 or return $grp->result ([], $entries);
634 } 746 }
635 747
636 # sort into likely dirs and likely nondirs 748 # sort into likely dirs and likely nondirs
637 # dirs == files without ".", short entries first 749 # dirs == files without ".", short entries first
638 $entries = [map $_->[0], 750 $entries = [map $_->[0],
639 sort { $b->[1] cmp $a->[1] } 751 sort { $b->[1] cmp $a->[1] }
640 map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length], 752 map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],
641 @$entries]; 753 @$entries];
642 754
643 my (@dirs, @nondirs); 755 my (@dirs, @nondirs);
644 756
645 my $statgrp = add $grp aio_group sub { 757 my $statgrp = add $grp aio_group sub {
646 $grp->result (\@dirs, \@nondirs); 758 $grp->result (\@dirs, \@nondirs);
647 }; 759 };
648 760
649 limit $statgrp $maxreq; 761 limit $statgrp $maxreq;
650 feed $statgrp sub { 762 feed $statgrp sub {
651 return unless @$entries; 763 return unless @$entries;
652 my $entry = pop @$entries; 764 my $entry = pop @$entries;
653 765
654 aioreq_pri $pri; 766 aioreq_pri $pri;
655 add $statgrp aio_stat "$path/$entry/.", sub { 767 add $statgrp aio_stat "$path/$entry/.", sub {
656 if ($_[0] < 0) { 768 if ($_[0] < 0) {
657 push @nondirs, $entry; 769 push @nondirs, $entry;
658 } else { 770 } else {
659 # need to check for real directory 771 # need to check for real directory
660 aioreq_pri $pri; 772 aioreq_pri $pri;
661 add $statgrp aio_lstat "$path/$entry", sub { 773 add $statgrp aio_lstat "$path/$entry", sub {
662 if (-d _) { 774 if (-d _) {
663 push @dirs, $entry; 775 push @dirs, $entry;
664 776
665 unless (--$ndirs) { 777 unless (--$ndirs) {
666 push @nondirs, @$entries; 778 push @nondirs, @$entries;
667 feed $statgrp; 779 feed $statgrp;
780 }
781 } else {
782 push @nondirs, $entry;
668 } 783 }
669 } else {
670 push @nondirs, $entry;
671 } 784 }
672 } 785 }
673 } 786 };
674 }; 787 };
675 }; 788 };
676 }; 789 };
677 }; 790 };
791
792 $grp
678 }; 793 }
794}
679 795
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
680 $grp 829 $grp
830 }
681} 831}
682 832
683=item aio_fsync $fh, $callback->($status) 833=item aio_fsync $fh, $callback->($status)
684 834
685Asynchronously call fsync on the given filehandle and call the callback 835Asynchronously call fsync on the given filehandle and call the callback
… …
939that are being processed by C<IO::AIO::poll_cb> in one call, respectively 1089that are being processed by C<IO::AIO::poll_cb> in one call, respectively
940the maximum amount of time (default C<0>, meaning infinity) spent in 1090the maximum amount of time (default C<0>, meaning infinity) spent in
941C<IO::AIO::poll_cb> to process requests (more correctly the mininum amount 1091C<IO::AIO::poll_cb> to process requests (more correctly the mininum amount
942of time C<poll_cb> is allowed to use). 1092of time C<poll_cb> is allowed to use).
943 1093
1094Setting C<max_poll_time> to a non-zero value creates an overhead of one
1095syscall per request processed, which is not normally a problem unless your
1096callbacks are really really fast or your OS is really really slow (I am
1097not mentioning Solaris here). Using C<max_poll_reqs> incurs no overhead.
1098
944Setting these is useful if you want to ensure some level of 1099Setting these is useful if you want to ensure some level of
945interactiveness when perl is not fast enough to process all requests in 1100interactiveness when perl is not fast enough to process all requests in
946time. 1101time.
947 1102
948For interactive programs, values such as C<0.01> to C<0.1> should be fine. 1103For interactive programs, values such as C<0.01> to C<0.1> should be fine.
949 1104
950Example: Install an Event watcher that automatically calls 1105Example: Install an Event watcher that automatically calls
951IO::AIO::poll_some with low priority, to ensure that other parts of the 1106IO::AIO::poll_cb with low priority, to ensure that other parts of the
952program get the CPU sometimes even under high AIO load. 1107program get the CPU sometimes even under high AIO load.
953 1108
954 # try not to spend much more than 0.1s in poll_cb 1109 # try not to spend much more than 0.1s in poll_cb
955 IO::AIO::max_poll_time 0.1; 1110 IO::AIO::max_poll_time 0.1;
956 1111
… …
959 poll => 'r', nice => 1, 1114 poll => 'r', nice => 1,
960 cb => &IO::AIO::poll_cb); 1115 cb => &IO::AIO::poll_cb);
961 1116
962=item IO::AIO::poll_wait 1117=item IO::AIO::poll_wait
963 1118
1119If there are any outstanding requests and none of them in the result
964Wait till the result filehandle becomes ready for reading (simply does a 1120phase, wait till the result filehandle becomes ready for reading (simply
965C<select> on the filehandle. This is useful if you want to synchronously 1121does a C<select> on the filehandle. This is useful if you want to
966wait for some requests to finish). 1122synchronously wait for some requests to finish).
967 1123
968See C<nreqs> for an example. 1124See C<nreqs> for an example.
969 1125
970=item IO::AIO::poll 1126=item IO::AIO::poll
971 1127
972Waits until some requests have been handled. 1128Waits until some requests have been handled.
973 1129
1130Returns the number of requests processed, but is otherwise strictly
974Strictly equivalent to: 1131equivalent to:
975 1132
976 IO::AIO::poll_wait, IO::AIO::poll_cb 1133 IO::AIO::poll_wait, IO::AIO::poll_cb
977 if IO::AIO::nreqs;
978 1134
979=item IO::AIO::flush 1135=item IO::AIO::flush
980 1136
981Wait till all outstanding AIO requests have been handled. 1137Wait till all outstanding AIO requests have been handled.
982 1138
983Strictly equivalent to: 1139Strictly equivalent to:
984 1140
985 IO::AIO::poll_wait, IO::AIO::poll_cb 1141 IO::AIO::poll_wait, IO::AIO::poll_cb
986 while IO::AIO::nreqs; 1142 while IO::AIO::nreqs;
987 1143
1144=back
1145
988=head3 CONTROLLING THE NUMBER OF THREADS 1146=head3 CONTROLLING THE NUMBER OF THREADS
1147
1148=over
989 1149
990=item IO::AIO::min_parallel $nthreads 1150=item IO::AIO::min_parallel $nthreads
991 1151
992Set the minimum number of AIO threads to C<$nthreads>. The current 1152Set the minimum number of AIO threads to C<$nthreads>. The current
993default is C<8>, which means eight asynchronous operations can execute 1153default is C<8>, which means eight asynchronous operations can execute
… …
1052 1212
1053You can still queue as many requests as you want. Therefore, 1213You can still queue as many requests as you want. Therefore,
1054C<max_oustsanding> is mainly useful in simple scripts (with low values) or 1214C<max_oustsanding> is mainly useful in simple scripts (with low values) or
1055as a stop gap to shield against fatal memory overflow (with large values). 1215as a stop gap to shield against fatal memory overflow (with large values).
1056 1216
1217=back
1218
1057=head3 STATISTICAL INFORMATION 1219=head3 STATISTICAL INFORMATION
1220
1221=over
1058 1222
1059=item IO::AIO::nreqs 1223=item IO::AIO::nreqs
1060 1224
1061Returns the number of requests currently in the ready, execute or pending 1225Returns the number of requests currently in the ready, execute or pending
1062states (i.e. for which their callback has not been invoked yet). 1226states (i.e. for which their callback has not been invoked yet).
… …
1096 *$sym 1260 *$sym
1097} 1261}
1098 1262
1099min_parallel 8; 1263min_parallel 8;
1100 1264
1101END { 1265END { flush }
1102 min_parallel 1;
1103 flush;
1104};
1105 1266
11061; 12671;
1107 1268
1108=head2 FORK BEHAVIOUR 1269=head2 FORK BEHAVIOUR
1109 1270

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