… | |
… | |
62 | etc.), but can also be used to easily do operations in parallel that are |
62 | etc.), but can also be used to easily do operations in parallel that are |
63 | normally done sequentially, e.g. stat'ing many files, which is much faster |
63 | normally done sequentially, e.g. stat'ing many files, which is much faster |
64 | on a RAID volume or over NFS when you do a number of stat operations |
64 | on a RAID volume or over NFS when you do a number of stat operations |
65 | concurrently. |
65 | concurrently. |
66 | |
66 | |
67 | While most of this works on all types of file descriptors (for example |
67 | While most of this works on all types of file descriptors (for |
68 | sockets), using these functions on file descriptors that support |
68 | example sockets), using these functions on file descriptors that |
69 | nonblocking operation (again, sockets, pipes etc.) is very inefficient or |
69 | support nonblocking operation (again, sockets, pipes etc.) is very |
70 | might not work (aio_read fails on sockets/pipes/fifos). Use an event loop |
70 | inefficient. Use an event loop for that (such as the L<Event|Event> |
71 | for that (such as the L<Event|Event> module): IO::AIO will naturally fit |
71 | module): IO::AIO will naturally fit into such an event loop itself. |
72 | into such an event loop itself. |
|
|
73 | |
72 | |
74 | In this version, a number of threads are started that execute your |
73 | In this version, a number of threads are started that execute your |
75 | requests and signal their completion. You don't need thread support |
74 | requests and signal their completion. You don't need thread support |
76 | in perl, and the threads created by this module will not be visible |
75 | in perl, and the threads created by this module will not be visible |
77 | to perl. In the future, this module might make use of the native aio |
76 | to perl. In the future, this module might make use of the native aio |
… | |
… | |
79 | not well-supported or restricted (GNU/Linux doesn't allow them on normal |
78 | not well-supported or restricted (GNU/Linux doesn't allow them on normal |
80 | files currently, for example), and they would only support aio_read and |
79 | files currently, for example), and they would only support aio_read and |
81 | aio_write, so the remaining functionality would have to be implemented |
80 | aio_write, so the remaining functionality would have to be implemented |
82 | using threads anyway. |
81 | using threads anyway. |
83 | |
82 | |
84 | Although the module will work with in the presence of other (Perl-) |
83 | Although the module will work in the presence of other (Perl-) threads, |
85 | threads, it is currently not reentrant in any way, so use appropriate |
84 | it is currently not reentrant in any way, so use appropriate locking |
86 | locking yourself, always call C<poll_cb> from within the same thread, or |
85 | yourself, always call C<poll_cb> from within the same thread, or never |
87 | never call C<poll_cb> (or other C<aio_> functions) recursively. |
86 | call C<poll_cb> (or other C<aio_> functions) recursively. |
88 | |
87 | |
89 | =head2 EXAMPLE |
88 | =head2 EXAMPLE |
90 | |
89 | |
91 | This is a simple example that uses the Event module and loads |
90 | This is a simple example that uses the Event module and loads |
92 | F</etc/passwd> asynchronously: |
91 | F</etc/passwd> asynchronously: |
… | |
… | |
190 | use strict 'vars'; |
189 | use strict 'vars'; |
191 | |
190 | |
192 | use base 'Exporter'; |
191 | use base 'Exporter'; |
193 | |
192 | |
194 | BEGIN { |
193 | BEGIN { |
195 | our $VERSION = '2.21'; |
194 | our $VERSION = '2.4'; |
196 | |
195 | |
197 | our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat |
196 | our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat |
198 | aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink |
197 | aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink |
199 | aio_readlink aio_fsync aio_fdatasync aio_readahead aio_rename aio_link |
198 | aio_readlink aio_fsync aio_fdatasync aio_readahead aio_rename aio_link |
200 | aio_move aio_copy aio_group aio_nop aio_mknod); |
199 | aio_move aio_copy aio_group aio_nop aio_mknod aio_load aio_rmtree aio_mkdir |
|
|
200 | aio_chown aio_chmod aio_utime aio_truncate); |
201 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice aio_block)); |
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); |
… | |
… | |
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 | |
278 | Similar to C<aioreq_pri>, but subtracts the given value from the current |
279 | Similar to C<aioreq_pri>, but subtracts the given value from the current |
279 | priority, so the effect is cumulative. |
280 | priority, 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 | |
283 | Asynchronously open or create a file and call the callback with a newly |
285 | Asynchronously open or create a file and call the callback with a newly |
284 | created filehandle for the file. |
286 | created filehandle for the file. |
… | |
… | |
290 | list. They are the same as used by C<sysopen>. |
292 | list. They are the same as used by C<sysopen>. |
291 | |
293 | |
292 | Likewise, C<$mode> specifies the mode of the newly created file, if it |
294 | Likewise, C<$mode> specifies the mode of the newly created file, if it |
293 | didn't exist and C<O_CREAT> has been given, just like perl's C<sysopen>, |
295 | didn't exist and C<O_CREAT> has been given, just like perl's C<sysopen>, |
294 | except that it is mandatory (i.e. use C<0> if you don't create new files, |
296 | except that it is mandatory (i.e. use C<0> if you don't create new files, |
295 | and C<0666> or C<0777> if you do). |
297 | and C<0666> or C<0777> if you do). Note that the C<$mode> will be modified |
|
|
298 | by the umask in effect then the request is being executed, so better never |
|
|
299 | change the umask. |
296 | |
300 | |
297 | Example: |
301 | Example: |
298 | |
302 | |
299 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
303 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
300 | if ($_[0]) { |
304 | if ($_[0]) { |
… | |
… | |
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 | |
310 | Asynchronously close a file and call the callback with the result |
315 | Asynchronously close a file and call the callback with the result |
311 | code. I<WARNING:> although accepted, you should not pass in a perl |
316 | code. I<WARNING:> although accepted, you should not pass in a perl |
312 | filehandle here, as perl will likely close the file descriptor another |
317 | filehandle here, as perl will likely close the file descriptor another |
… | |
… | |
314 | C<close> or just let filehandles go out of scope. |
319 | C<close> or just let filehandles go out of scope. |
315 | |
320 | |
316 | This is supposed to be a bug in the API, so that might change. It's |
321 | This is supposed to be a bug in the API, so that might change. It's |
317 | therefore best to avoid this function. |
322 | therefore 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 | |
323 | Reads or writes C<length> bytes from the specified C<fh> and C<offset> |
329 | Reads or writes C<$length> bytes from the specified C<$fh> and C<$offset> |
324 | into the scalar given by C<data> and offset C<dataoffset> and calls the |
330 | into the scalar given by C<$data> and offset C<$dataoffset> and calls the |
325 | callback without the actual number of bytes read (or -1 on error, just |
331 | callback without the actual number of bytes read (or -1 on error, just |
326 | like the syscall). |
332 | like the syscall). |
327 | |
333 | |
|
|
334 | If C<$offset> is undefined, then the current file descriptor offset will |
|
|
335 | be used (and updated), otherwise the file descriptor offset will not be |
|
|
336 | changed by these calls. |
|
|
337 | |
|
|
338 | If C<$length> is undefined in C<aio_write>, use the remaining length of C<$data>. |
|
|
339 | |
|
|
340 | If C<$dataoffset> is less than zero, it will be counted from the end of |
|
|
341 | C<$data>. |
|
|
342 | |
328 | The C<$data> scalar I<MUST NOT> be modified in any way while the request |
343 | The C<$data> scalar I<MUST NOT> be modified in any way while the request |
329 | is outstanding. Modifying it can result in segfaults or WW3 (if the |
344 | is outstanding. Modifying it can result in segfaults or World War III (if |
330 | necessary/optional hardware is installed). |
345 | the necessary/optional hardware is installed). |
331 | |
346 | |
332 | Example: Read 15 bytes at offset 7 into scalar C<$buffer>, starting at |
347 | Example: Read 15 bytes at offset 7 into scalar C<$buffer>, starting at |
333 | offset C<0> within the scalar: |
348 | offset C<0> within the scalar: |
334 | |
349 | |
335 | aio_read $fh, 7, 15, $buffer, 0, sub { |
350 | aio_read $fh, 7, 15, $buffer, 0, sub { |
336 | $_[0] > 0 or die "read error: $!"; |
351 | $_[0] > 0 or die "read error: $!"; |
337 | print "read $_[0] bytes: <$buffer>\n"; |
352 | print "read $_[0] bytes: <$buffer>\n"; |
338 | }; |
353 | }; |
|
|
354 | |
339 | |
355 | |
340 | =item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
356 | =item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
341 | |
357 | |
342 | Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts |
358 | Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts |
343 | reading at byte offset C<$in_offset>, and starts writing at the current |
359 | reading at byte offset C<$in_offset>, and starts writing at the current |
… | |
… | |
357 | C<$in_fh> than are written, and there is no way to find out how many |
373 | C<$in_fh> than are written, and there is no way to find out how many |
358 | bytes have been read from C<aio_sendfile> alone, as C<aio_sendfile> only |
374 | bytes have been read from C<aio_sendfile> alone, as C<aio_sendfile> only |
359 | provides the number of bytes written to C<$out_fh>. Only if the result |
375 | provides the number of bytes written to C<$out_fh>. Only if the result |
360 | value equals C<$length> one can assume that C<$length> bytes have been |
376 | value equals C<$length> one can assume that C<$length> bytes have been |
361 | read. |
377 | read. |
|
|
378 | |
362 | |
379 | |
363 | =item aio_readahead $fh,$offset,$length, $callback->($retval) |
380 | =item aio_readahead $fh,$offset,$length, $callback->($retval) |
364 | |
381 | |
365 | C<aio_readahead> populates the page cache with data from a file so that |
382 | C<aio_readahead> populates the page cache with data from a file so that |
366 | subsequent reads from that file will not block on disk I/O. The C<$offset> |
383 | subsequent reads from that file will not block on disk I/O. The C<$offset> |
… | |
… | |
372 | file. The current file offset of the file is left unchanged. |
389 | file. The current file offset of the file is left unchanged. |
373 | |
390 | |
374 | If that syscall doesn't exist (likely if your OS isn't Linux) it will be |
391 | If that syscall doesn't exist (likely if your OS isn't Linux) it will be |
375 | emulated by simply reading the data, which would have a similar effect. |
392 | emulated by simply reading the data, which would have a similar effect. |
376 | |
393 | |
|
|
394 | |
377 | =item aio_stat $fh_or_path, $callback->($status) |
395 | =item aio_stat $fh_or_path, $callback->($status) |
378 | |
396 | |
379 | =item aio_lstat $fh, $callback->($status) |
397 | =item aio_lstat $fh, $callback->($status) |
380 | |
398 | |
381 | Works like perl's C<stat> or C<lstat> in void context. The callback will |
399 | Works like perl's C<stat> or C<lstat> in void context. The callback will |
… | |
… | |
394 | aio_stat "/etc/passwd", sub { |
412 | aio_stat "/etc/passwd", sub { |
395 | $_[0] and die "stat failed: $!"; |
413 | $_[0] and die "stat failed: $!"; |
396 | print "size is ", -s _, "\n"; |
414 | print "size is ", -s _, "\n"; |
397 | }; |
415 | }; |
398 | |
416 | |
|
|
417 | |
|
|
418 | =item aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
|
|
419 | |
|
|
420 | Works like perl's C<utime> function (including the special case of $atime |
|
|
421 | and $mtime being undef). Fractional times are supported if the underlying |
|
|
422 | syscalls support them. |
|
|
423 | |
|
|
424 | When called with a pathname, uses utimes(2) if available, otherwise |
|
|
425 | utime(2). If called on a file descriptor, uses futimes(2) if available, |
|
|
426 | otherwise returns ENOSYS, so this is not portable. |
|
|
427 | |
|
|
428 | Examples: |
|
|
429 | |
|
|
430 | # set atime and mtime to current time (basically touch(1)): |
|
|
431 | aio_utime "path", undef, undef; |
|
|
432 | # set atime to current time and mtime to beginning of the epoch: |
|
|
433 | aio_utime "path", time, undef; # undef==0 |
|
|
434 | |
|
|
435 | |
|
|
436 | =item aio_chown $fh_or_path, $uid, $gid, $callback->($status) |
|
|
437 | |
|
|
438 | Works like perl's C<chown> function, except that C<undef> for either $uid |
|
|
439 | or $gid is being interpreted as "do not change" (but -1 can also be used). |
|
|
440 | |
|
|
441 | Examples: |
|
|
442 | |
|
|
443 | # same as "chown root path" in the shell: |
|
|
444 | aio_chown "path", 0, -1; |
|
|
445 | # same as above: |
|
|
446 | aio_chown "path", 0, undef; |
|
|
447 | |
|
|
448 | |
|
|
449 | =item aio_truncate $fh_or_path, $offset, $callback->($status) |
|
|
450 | |
|
|
451 | Works like truncate(2) or ftruncate(2). |
|
|
452 | |
|
|
453 | |
|
|
454 | =item aio_chmod $fh_or_path, $mode, $callback->($status) |
|
|
455 | |
|
|
456 | Works like perl's C<chmod> function. |
|
|
457 | |
|
|
458 | |
399 | =item aio_unlink $pathname, $callback->($status) |
459 | =item aio_unlink $pathname, $callback->($status) |
400 | |
460 | |
401 | Asynchronously unlink (delete) a file and call the callback with the |
461 | Asynchronously unlink (delete) a file and call the callback with the |
402 | result code. |
462 | result code. |
403 | |
463 | |
|
|
464 | |
404 | =item aio_mknod $path, $mode, $dev, $callback->($status) |
465 | =item aio_mknod $path, $mode, $dev, $callback->($status) |
405 | |
466 | |
406 | [EXPERIMENTAL] |
467 | [EXPERIMENTAL] |
407 | |
468 | |
408 | Asynchronously create a device node (or fifo). See mknod(2). |
469 | Asynchronously create a device node (or fifo). See mknod(2). |
409 | |
470 | |
410 | The only (POSIX-) portable way of calling this function is: |
471 | The only (POSIX-) portable way of calling this function is: |
411 | |
472 | |
412 | aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ... |
473 | aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ... |
|
|
474 | |
413 | |
475 | |
414 | =item aio_link $srcpath, $dstpath, $callback->($status) |
476 | =item aio_link $srcpath, $dstpath, $callback->($status) |
415 | |
477 | |
416 | Asynchronously create a new link to the existing object at C<$srcpath> at |
478 | Asynchronously create a new link to the existing object at C<$srcpath> at |
417 | the path C<$dstpath> and call the callback with the result code. |
479 | the path C<$dstpath> and call the callback with the result code. |
418 | |
480 | |
|
|
481 | |
419 | =item aio_symlink $srcpath, $dstpath, $callback->($status) |
482 | =item aio_symlink $srcpath, $dstpath, $callback->($status) |
420 | |
483 | |
421 | Asynchronously create a new symbolic link to the existing object at C<$srcpath> at |
484 | Asynchronously create a new symbolic link to the existing object at C<$srcpath> at |
422 | the path C<$dstpath> and call the callback with the result code. |
485 | the path C<$dstpath> and call the callback with the result code. |
|
|
486 | |
423 | |
487 | |
424 | =item aio_readlink $path, $callback->($link) |
488 | =item aio_readlink $path, $callback->($link) |
425 | |
489 | |
426 | Asynchronously read the symlink specified by C<$path> and pass it to |
490 | Asynchronously read the symlink specified by C<$path> and pass it to |
427 | the callback. If an error occurs, nothing or undef gets passed to the |
491 | the callback. If an error occurs, nothing or undef gets passed to the |
428 | callback. |
492 | callback. |
429 | |
493 | |
|
|
494 | |
430 | =item aio_rename $srcpath, $dstpath, $callback->($status) |
495 | =item aio_rename $srcpath, $dstpath, $callback->($status) |
431 | |
496 | |
432 | Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as |
497 | Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as |
433 | rename(2) and call the callback with the result code. |
498 | rename(2) and call the callback with the result code. |
434 | |
499 | |
|
|
500 | |
|
|
501 | =item aio_mkdir $pathname, $mode, $callback->($status) |
|
|
502 | |
|
|
503 | Asynchronously mkdir (create) a directory and call the callback with |
|
|
504 | the result code. C<$mode> will be modified by the umask at the time the |
|
|
505 | request is executed, so do not change your umask. |
|
|
506 | |
|
|
507 | |
435 | =item aio_rmdir $pathname, $callback->($status) |
508 | =item aio_rmdir $pathname, $callback->($status) |
436 | |
509 | |
437 | Asynchronously rmdir (delete) a directory and call the callback with the |
510 | Asynchronously rmdir (delete) a directory and call the callback with the |
438 | result code. |
511 | result code. |
|
|
512 | |
439 | |
513 | |
440 | =item aio_readdir $pathname, $callback->($entries) |
514 | =item aio_readdir $pathname, $callback->($entries) |
441 | |
515 | |
442 | Unlike the POSIX call of the same name, C<aio_readdir> reads an entire |
516 | Unlike the POSIX call of the same name, C<aio_readdir> reads an entire |
443 | directory (i.e. opendir + readdir + closedir). The entries will not be |
517 | directory (i.e. opendir + readdir + closedir). The entries will not be |
444 | sorted, and will B<NOT> include the C<.> and C<..> entries. |
518 | sorted, and will B<NOT> include the C<.> and C<..> entries. |
445 | |
519 | |
446 | The callback a single argument which is either C<undef> or an array-ref |
520 | The callback a single argument which is either C<undef> or an array-ref |
447 | with the filenames. |
521 | with the filenames. |
|
|
522 | |
|
|
523 | |
|
|
524 | =item aio_load $path, $data, $callback->($status) |
|
|
525 | |
|
|
526 | This is a composite request that tries to fully load the given file into |
|
|
527 | memory. Status is the same as with aio_read. |
|
|
528 | |
|
|
529 | =cut |
|
|
530 | |
|
|
531 | sub aio_load($$;$) { |
|
|
532 | aio_block { |
|
|
533 | my ($path, undef, $cb) = @_; |
|
|
534 | my $data = \$_[1]; |
|
|
535 | |
|
|
536 | my $pri = aioreq_pri; |
|
|
537 | my $grp = aio_group $cb; |
|
|
538 | |
|
|
539 | aioreq_pri $pri; |
|
|
540 | add $grp aio_open $path, O_RDONLY, 0, sub { |
|
|
541 | my $fh = shift |
|
|
542 | or return $grp->result (-1); |
|
|
543 | |
|
|
544 | aioreq_pri $pri; |
|
|
545 | add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub { |
|
|
546 | $grp->result ($_[0]); |
|
|
547 | }; |
|
|
548 | }; |
|
|
549 | |
|
|
550 | $grp |
|
|
551 | } |
|
|
552 | } |
448 | |
553 | |
449 | =item aio_copy $srcpath, $dstpath, $callback->($status) |
554 | =item aio_copy $srcpath, $dstpath, $callback->($status) |
450 | |
555 | |
451 | Try to copy the I<file> (directories not supported as either source or |
556 | Try to copy the I<file> (directories not supported as either source or |
452 | destination) from C<$srcpath> to C<$dstpath> and call the callback with |
557 | destination) from C<$srcpath> to C<$dstpath> and call the callback with |
… | |
… | |
604 | as those tend to return 0 or 1 as link counts, which disables the |
709 | as those tend to return 0 or 1 as link counts, which disables the |
605 | directory counting heuristic. |
710 | directory counting heuristic. |
606 | |
711 | |
607 | =cut |
712 | =cut |
608 | |
713 | |
609 | sub aio_scandir($$$) { |
714 | sub aio_scandir($$;$) { |
610 | aio_block { |
715 | aio_block { |
611 | my ($path, $maxreq, $cb) = @_; |
716 | my ($path, $maxreq, $cb) = @_; |
612 | |
717 | |
613 | my $pri = aioreq_pri; |
718 | my $pri = aioreq_pri; |
614 | |
719 | |
… | |
… | |
692 | |
797 | |
693 | $grp |
798 | $grp |
694 | } |
799 | } |
695 | } |
800 | } |
696 | |
801 | |
|
|
802 | =item aio_rmtree $path, $callback->($status) |
|
|
803 | |
|
|
804 | Delete a directory tree starting (and including) C<$path>, return the |
|
|
805 | status of the final C<rmdir> only. This is a composite request that |
|
|
806 | uses C<aio_scandir> to recurse into and rmdir directories, and unlink |
|
|
807 | everything else. |
|
|
808 | |
|
|
809 | =cut |
|
|
810 | |
|
|
811 | sub aio_rmtree; |
|
|
812 | sub aio_rmtree($;$) { |
|
|
813 | aio_block { |
|
|
814 | my ($path, $cb) = @_; |
|
|
815 | |
|
|
816 | my $pri = aioreq_pri; |
|
|
817 | my $grp = aio_group $cb; |
|
|
818 | |
|
|
819 | aioreq_pri $pri; |
|
|
820 | add $grp aio_scandir $path, 0, sub { |
|
|
821 | my ($dirs, $nondirs) = @_; |
|
|
822 | |
|
|
823 | my $dirgrp = aio_group sub { |
|
|
824 | add $grp aio_rmdir $path, sub { |
|
|
825 | $grp->result ($_[0]); |
|
|
826 | }; |
|
|
827 | }; |
|
|
828 | |
|
|
829 | (aioreq_pri $pri), add $dirgrp aio_rmtree "$path/$_" for @$dirs; |
|
|
830 | (aioreq_pri $pri), add $dirgrp aio_unlink "$path/$_" for @$nondirs; |
|
|
831 | |
|
|
832 | add $grp $dirgrp; |
|
|
833 | }; |
|
|
834 | |
|
|
835 | $grp |
|
|
836 | } |
|
|
837 | } |
|
|
838 | |
697 | =item aio_fsync $fh, $callback->($status) |
839 | =item aio_fsync $fh, $callback->($status) |
698 | |
840 | |
699 | Asynchronously call fsync on the given filehandle and call the callback |
841 | Asynchronously call fsync on the given filehandle and call the callback |
700 | with the fsync result code. |
842 | with the fsync result code. |
701 | |
843 | |
… | |
… | |
1003 | Strictly equivalent to: |
1145 | Strictly equivalent to: |
1004 | |
1146 | |
1005 | IO::AIO::poll_wait, IO::AIO::poll_cb |
1147 | IO::AIO::poll_wait, IO::AIO::poll_cb |
1006 | while IO::AIO::nreqs; |
1148 | while IO::AIO::nreqs; |
1007 | |
1149 | |
|
|
1150 | =back |
|
|
1151 | |
1008 | =head3 CONTROLLING THE NUMBER OF THREADS |
1152 | =head3 CONTROLLING THE NUMBER OF THREADS |
|
|
1153 | |
|
|
1154 | =over |
1009 | |
1155 | |
1010 | =item IO::AIO::min_parallel $nthreads |
1156 | =item IO::AIO::min_parallel $nthreads |
1011 | |
1157 | |
1012 | Set the minimum number of AIO threads to C<$nthreads>. The current |
1158 | Set the minimum number of AIO threads to C<$nthreads>. The current |
1013 | default is C<8>, which means eight asynchronous operations can execute |
1159 | default is C<8>, which means eight asynchronous operations can execute |
… | |
… | |
1061 | This is a very bad function to use in interactive programs because it |
1207 | This is a very bad function to use in interactive programs because it |
1062 | blocks, and a bad way to reduce concurrency because it is inexact: Better |
1208 | blocks, and a bad way to reduce concurrency because it is inexact: Better |
1063 | use an C<aio_group> together with a feed callback. |
1209 | use an C<aio_group> together with a feed callback. |
1064 | |
1210 | |
1065 | Sets the maximum number of outstanding requests to C<$nreqs>. If you |
1211 | Sets the maximum number of outstanding requests to C<$nreqs>. If you |
1066 | to queue up more than this number of requests, the next call to the |
1212 | do queue up more than this number of requests, the next call to the |
1067 | C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>) |
1213 | C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>) |
1068 | function will block until the limit is no longer exceeded. |
1214 | function will block until the limit is no longer exceeded. |
1069 | |
1215 | |
1070 | The default value is very large, so there is no practical limit on the |
1216 | The default value is very large, so there is no practical limit on the |
1071 | number of outstanding requests. |
1217 | number of outstanding requests. |
1072 | |
1218 | |
1073 | You can still queue as many requests as you want. Therefore, |
1219 | You can still queue as many requests as you want. Therefore, |
1074 | C<max_oustsanding> is mainly useful in simple scripts (with low values) or |
1220 | C<max_oustsanding> is mainly useful in simple scripts (with low values) or |
1075 | as a stop gap to shield against fatal memory overflow (with large values). |
1221 | as a stop gap to shield against fatal memory overflow (with large values). |
1076 | |
1222 | |
|
|
1223 | =back |
|
|
1224 | |
1077 | =head3 STATISTICAL INFORMATION |
1225 | =head3 STATISTICAL INFORMATION |
|
|
1226 | |
|
|
1227 | =over |
1078 | |
1228 | |
1079 | =item IO::AIO::nreqs |
1229 | =item IO::AIO::nreqs |
1080 | |
1230 | |
1081 | Returns the number of requests currently in the ready, execute or pending |
1231 | Returns the number of requests currently in the ready, execute or pending |
1082 | states (i.e. for which their callback has not been invoked yet). |
1232 | states (i.e. for which their callback has not been invoked yet). |
… | |
… | |
1146 | bytes of memory. In addition, stat requests need a stat buffer (possibly |
1296 | bytes of memory. In addition, stat requests need a stat buffer (possibly |
1147 | a few hundred bytes), readdir requires a result buffer and so on. Perl |
1297 | a few hundred bytes), readdir requires a result buffer and so on. Perl |
1148 | scalars and other data passed into aio requests will also be locked and |
1298 | scalars and other data passed into aio requests will also be locked and |
1149 | will consume memory till the request has entered the done state. |
1299 | will consume memory till the request has entered the done state. |
1150 | |
1300 | |
1151 | This is now awfully much, so queuing lots of requests is not usually a |
1301 | This is not awfully much, so queuing lots of requests is not usually a |
1152 | problem. |
1302 | problem. |
1153 | |
1303 | |
1154 | Per-thread usage: |
1304 | Per-thread usage: |
1155 | |
1305 | |
1156 | In the execution phase, some aio requests require more memory for |
1306 | In the execution phase, some aio requests require more memory for |