… | |
… | |
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 | |
… | |
… | |
25 | $req->cancel; # cancel request if still in queue |
26 | $req->cancel; # cancel request if still in queue |
26 | |
27 | |
27 | my $grp = aio_group sub { print "all stats done\n" }; |
28 | my $grp = aio_group sub { print "all stats done\n" }; |
28 | add $grp aio_stat "..." for ...; |
29 | add $grp aio_stat "..." for ...; |
29 | |
30 | |
30 | # AnyEvent integration |
31 | # AnyEvent integration (EV, Event, Glib, Tk, urxvt, pureperl...) |
31 | open my $fh, "<&=" . IO::AIO::poll_fileno or die "$!"; |
32 | open my $fh, "<&=" . IO::AIO::poll_fileno or die "$!"; |
32 | my $w = AnyEvent->io (fh => $fh, poll => 'r', cb => sub { IO::AIO::poll_cb }); |
33 | my $w = AnyEvent->io (fh => $fh, poll => 'r', cb => sub { IO::AIO::poll_cb }); |
|
|
34 | |
|
|
35 | # EV integration |
|
|
36 | my $w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb; |
33 | |
37 | |
34 | # Event integration |
38 | # Event integration |
35 | Event->io (fd => IO::AIO::poll_fileno, |
39 | Event->io (fd => IO::AIO::poll_fileno, |
36 | poll => 'r', |
40 | poll => 'r', |
37 | cb => \&IO::AIO::poll_cb); |
41 | cb => \&IO::AIO::poll_cb); |
… | |
… | |
61 | etc.), but can also be used to easily do operations in parallel that are |
65 | etc.), but can also be used to easily do operations in parallel that are |
62 | normally done sequentially, e.g. stat'ing many files, which is much faster |
66 | normally done sequentially, e.g. stat'ing many files, which is much faster |
63 | on a RAID volume or over NFS when you do a number of stat operations |
67 | on a RAID volume or over NFS when you do a number of stat operations |
64 | concurrently. |
68 | concurrently. |
65 | |
69 | |
66 | While this works on all types of file descriptors (for example sockets), |
70 | While most of this works on all types of file descriptors (for |
67 | using these functions on file descriptors that support nonblocking |
71 | example sockets), using these functions on file descriptors that |
68 | operation (again, sockets, pipes etc.) is very inefficient. Use an event |
72 | support nonblocking operation (again, sockets, pipes etc.) is very |
69 | loop for that (such as the L<Event|Event> module): IO::AIO will naturally |
73 | inefficient. Use an event loop for that (such as the L<Event|Event> |
70 | fit into such an event loop itself. |
74 | module): IO::AIO will naturally fit into such an event loop itself. |
71 | |
75 | |
72 | In this version, a number of threads are started that execute your |
76 | In this version, a number of threads are started that execute your |
73 | requests and signal their completion. You don't need thread support |
77 | requests and signal their completion. You don't need thread support |
74 | in perl, and the threads created by this module will not be visible |
78 | in perl, and the threads created by this module will not be visible |
75 | to perl. In the future, this module might make use of the native aio |
79 | to perl. In the future, this module might make use of the native aio |
… | |
… | |
77 | not well-supported or restricted (GNU/Linux doesn't allow them on normal |
81 | not well-supported or restricted (GNU/Linux doesn't allow them on normal |
78 | files currently, for example), and they would only support aio_read and |
82 | files currently, for example), and they would only support aio_read and |
79 | aio_write, so the remaining functionality would have to be implemented |
83 | aio_write, so the remaining functionality would have to be implemented |
80 | using threads anyway. |
84 | using threads anyway. |
81 | |
85 | |
82 | Although the module will work with in the presence of other (Perl-) |
86 | Although the module will work in the presence of other (Perl-) threads, |
83 | threads, it is currently not reentrant in any way, so use appropriate |
87 | it is currently not reentrant in any way, so use appropriate locking |
84 | locking yourself, always call C<poll_cb> from within the same thread, or |
88 | yourself, always call C<poll_cb> from within the same thread, or never |
85 | never call C<poll_cb> (or other C<aio_> functions) recursively. |
89 | call C<poll_cb> (or other C<aio_> functions) recursively. |
86 | |
90 | |
87 | =head2 EXAMPLE |
91 | =head2 EXAMPLE |
88 | |
92 | |
89 | This is a simple example that uses the Event module and loads |
93 | This is a simple example that uses the Event module and loads |
90 | F</etc/passwd> asynchronously: |
94 | F</etc/passwd> asynchronously: |
… | |
… | |
98 | poll => 'r', |
102 | poll => 'r', |
99 | cb => \&IO::AIO::poll_cb); |
103 | cb => \&IO::AIO::poll_cb); |
100 | |
104 | |
101 | # queue the request to open /etc/passwd |
105 | # queue the request to open /etc/passwd |
102 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
106 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
103 | my $fh = $_[0] |
107 | my $fh = shift |
104 | or die "error while opening: $!"; |
108 | or die "error while opening: $!"; |
105 | |
109 | |
106 | # stat'ing filehandles is generally non-blocking |
110 | # stat'ing filehandles is generally non-blocking |
107 | my $size = -s $fh; |
111 | my $size = -s $fh; |
108 | |
112 | |
… | |
… | |
182 | |
186 | |
183 | =cut |
187 | =cut |
184 | |
188 | |
185 | package IO::AIO; |
189 | package IO::AIO; |
186 | |
190 | |
|
|
191 | use Carp (); |
|
|
192 | |
187 | no warnings; |
193 | no warnings; |
188 | use strict 'vars'; |
194 | use strict 'vars'; |
189 | |
195 | |
190 | use base 'Exporter'; |
196 | use base 'Exporter'; |
191 | |
197 | |
192 | BEGIN { |
198 | BEGIN { |
193 | our $VERSION = '2.1'; |
199 | our $VERSION = '2.61'; |
194 | |
200 | |
195 | our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat |
201 | our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close |
196 | aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink |
202 | aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir |
197 | aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move |
203 | aio_scandir aio_symlink aio_readlink aio_sync aio_fsync |
198 | aio_copy aio_group aio_nop aio_mknod); |
204 | aio_fdatasync aio_pathsync aio_readahead |
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205 | aio_rename aio_link aio_move aio_copy aio_group |
|
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206 | aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown |
|
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207 | aio_chmod aio_utime aio_truncate); |
|
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208 | |
199 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); |
209 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice aio_block)); |
200 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
210 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
201 | min_parallel max_parallel max_idle |
211 | min_parallel max_parallel max_idle |
202 | nreqs nready npending nthreads |
212 | nreqs nready npending nthreads |
203 | max_poll_time max_poll_reqs); |
213 | max_poll_time max_poll_reqs); |
204 | |
214 | |
… | |
… | |
269 | aio_read $_[0], ..., sub { |
279 | aio_read $_[0], ..., sub { |
270 | ... |
280 | ... |
271 | }; |
281 | }; |
272 | }; |
282 | }; |
273 | |
283 | |
|
|
284 | |
274 | =item aioreq_nice $pri_adjust |
285 | =item aioreq_nice $pri_adjust |
275 | |
286 | |
276 | Similar to C<aioreq_pri>, but subtracts the given value from the current |
287 | Similar to C<aioreq_pri>, but subtracts the given value from the current |
277 | priority, so the effect is cumulative. |
288 | priority, so the effect is cumulative. |
|
|
289 | |
278 | |
290 | |
279 | =item aio_open $pathname, $flags, $mode, $callback->($fh) |
291 | =item aio_open $pathname, $flags, $mode, $callback->($fh) |
280 | |
292 | |
281 | Asynchronously open or create a file and call the callback with a newly |
293 | Asynchronously open or create a file and call the callback with a newly |
282 | created filehandle for the file. |
294 | created filehandle for the file. |
… | |
… | |
288 | list. They are the same as used by C<sysopen>. |
300 | list. They are the same as used by C<sysopen>. |
289 | |
301 | |
290 | Likewise, C<$mode> specifies the mode of the newly created file, if it |
302 | Likewise, C<$mode> specifies the mode of the newly created file, if it |
291 | didn't exist and C<O_CREAT> has been given, just like perl's C<sysopen>, |
303 | didn't exist and C<O_CREAT> has been given, just like perl's C<sysopen>, |
292 | except that it is mandatory (i.e. use C<0> if you don't create new files, |
304 | except that it is mandatory (i.e. use C<0> if you don't create new files, |
293 | and C<0666> or C<0777> if you do). |
305 | and C<0666> or C<0777> if you do). Note that the C<$mode> will be modified |
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|
306 | by the umask in effect then the request is being executed, so better never |
|
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307 | change the umask. |
294 | |
308 | |
295 | Example: |
309 | Example: |
296 | |
310 | |
297 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
311 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
298 | if ($_[0]) { |
312 | if ($_[0]) { |
… | |
… | |
301 | } else { |
315 | } else { |
302 | die "open failed: $!\n"; |
316 | die "open failed: $!\n"; |
303 | } |
317 | } |
304 | }; |
318 | }; |
305 | |
319 | |
|
|
320 | |
306 | =item aio_close $fh, $callback->($status) |
321 | =item aio_close $fh, $callback->($status) |
307 | |
322 | |
308 | Asynchronously close a file and call the callback with the result |
323 | Asynchronously close a file and call the callback with the result |
309 | code. I<WARNING:> although accepted, you should not pass in a perl |
324 | code. |
310 | filehandle here, as perl will likely close the file descriptor another |
|
|
311 | time when the filehandle is destroyed. Normally, you can safely call perls |
|
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312 | C<close> or just let filehandles go out of scope. |
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313 | |
325 | |
314 | This is supposed to be a bug in the API, so that might change. It's |
326 | Unfortunately, you can't do this to perl. Perl I<insists> very strongly on |
315 | therefore best to avoid this function. |
327 | closing the file descriptor associated with the filehandle itself. |
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328 | |
|
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329 | Therefore, C<aio_close> will not close the filehandle - instead it will |
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330 | use dup2 to overwrite the file descriptor with the write-end of a pipe |
|
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331 | (the pipe fd will be created on demand and will be cached). |
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332 | |
|
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333 | Or in other words: the file descriptor will be closed, but it will not be |
|
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334 | free for reuse until the perl filehandle is closed. |
|
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335 | |
|
|
336 | =cut |
316 | |
337 | |
317 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
338 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
318 | |
339 | |
319 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
340 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
320 | |
341 | |
321 | Reads or writes C<length> bytes from the specified C<fh> and C<offset> |
342 | Reads or writes C<$length> bytes from the specified C<$fh> and C<$offset> |
322 | into the scalar given by C<data> and offset C<dataoffset> and calls the |
343 | into the scalar given by C<$data> and offset C<$dataoffset> and calls the |
323 | callback without the actual number of bytes read (or -1 on error, just |
344 | callback without the actual number of bytes read (or -1 on error, just |
324 | like the syscall). |
345 | like the syscall). |
325 | |
346 | |
|
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347 | If C<$offset> is undefined, then the current file descriptor offset will |
|
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348 | be used (and updated), otherwise the file descriptor offset will not be |
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349 | changed by these calls. |
|
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350 | |
|
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351 | If C<$length> is undefined in C<aio_write>, use the remaining length of C<$data>. |
|
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352 | |
|
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353 | If C<$dataoffset> is less than zero, it will be counted from the end of |
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354 | C<$data>. |
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355 | |
326 | The C<$data> scalar I<MUST NOT> be modified in any way while the request |
356 | The C<$data> scalar I<MUST NOT> be modified in any way while the request |
327 | is outstanding. Modifying it can result in segfaults or WW3 (if the |
357 | is outstanding. Modifying it can result in segfaults or World War III (if |
328 | necessary/optional hardware is installed). |
358 | the necessary/optional hardware is installed). |
329 | |
359 | |
330 | Example: Read 15 bytes at offset 7 into scalar C<$buffer>, starting at |
360 | Example: Read 15 bytes at offset 7 into scalar C<$buffer>, starting at |
331 | offset C<0> within the scalar: |
361 | offset C<0> within the scalar: |
332 | |
362 | |
333 | aio_read $fh, 7, 15, $buffer, 0, sub { |
363 | aio_read $fh, 7, 15, $buffer, 0, sub { |
334 | $_[0] > 0 or die "read error: $!"; |
364 | $_[0] > 0 or die "read error: $!"; |
335 | print "read $_[0] bytes: <$buffer>\n"; |
365 | print "read $_[0] bytes: <$buffer>\n"; |
336 | }; |
366 | }; |
|
|
367 | |
337 | |
368 | |
338 | =item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
369 | =item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
339 | |
370 | |
340 | Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts |
371 | Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts |
341 | reading at byte offset C<$in_offset>, and starts writing at the current |
372 | reading at byte offset C<$in_offset>, and starts writing at the current |
… | |
… | |
355 | C<$in_fh> than are written, and there is no way to find out how many |
386 | C<$in_fh> than are written, and there is no way to find out how many |
356 | bytes have been read from C<aio_sendfile> alone, as C<aio_sendfile> only |
387 | bytes have been read from C<aio_sendfile> alone, as C<aio_sendfile> only |
357 | provides the number of bytes written to C<$out_fh>. Only if the result |
388 | provides the number of bytes written to C<$out_fh>. Only if the result |
358 | value equals C<$length> one can assume that C<$length> bytes have been |
389 | value equals C<$length> one can assume that C<$length> bytes have been |
359 | read. |
390 | read. |
|
|
391 | |
360 | |
392 | |
361 | =item aio_readahead $fh,$offset,$length, $callback->($retval) |
393 | =item aio_readahead $fh,$offset,$length, $callback->($retval) |
362 | |
394 | |
363 | C<aio_readahead> populates the page cache with data from a file so that |
395 | C<aio_readahead> populates the page cache with data from a file so that |
364 | subsequent reads from that file will not block on disk I/O. The C<$offset> |
396 | subsequent reads from that file will not block on disk I/O. The C<$offset> |
… | |
… | |
370 | file. The current file offset of the file is left unchanged. |
402 | file. The current file offset of the file is left unchanged. |
371 | |
403 | |
372 | If that syscall doesn't exist (likely if your OS isn't Linux) it will be |
404 | If that syscall doesn't exist (likely if your OS isn't Linux) it will be |
373 | emulated by simply reading the data, which would have a similar effect. |
405 | emulated by simply reading the data, which would have a similar effect. |
374 | |
406 | |
|
|
407 | |
375 | =item aio_stat $fh_or_path, $callback->($status) |
408 | =item aio_stat $fh_or_path, $callback->($status) |
376 | |
409 | |
377 | =item aio_lstat $fh, $callback->($status) |
410 | =item aio_lstat $fh, $callback->($status) |
378 | |
411 | |
379 | Works like perl's C<stat> or C<lstat> in void context. The callback will |
412 | Works like perl's C<stat> or C<lstat> in void context. The callback will |
… | |
… | |
392 | aio_stat "/etc/passwd", sub { |
425 | aio_stat "/etc/passwd", sub { |
393 | $_[0] and die "stat failed: $!"; |
426 | $_[0] and die "stat failed: $!"; |
394 | print "size is ", -s _, "\n"; |
427 | print "size is ", -s _, "\n"; |
395 | }; |
428 | }; |
396 | |
429 | |
|
|
430 | |
|
|
431 | =item aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
|
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432 | |
|
|
433 | Works like perl's C<utime> function (including the special case of $atime |
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434 | and $mtime being undef). Fractional times are supported if the underlying |
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435 | syscalls support them. |
|
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436 | |
|
|
437 | When called with a pathname, uses utimes(2) if available, otherwise |
|
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438 | utime(2). If called on a file descriptor, uses futimes(2) if available, |
|
|
439 | otherwise returns ENOSYS, so this is not portable. |
|
|
440 | |
|
|
441 | Examples: |
|
|
442 | |
|
|
443 | # set atime and mtime to current time (basically touch(1)): |
|
|
444 | aio_utime "path", undef, undef; |
|
|
445 | # set atime to current time and mtime to beginning of the epoch: |
|
|
446 | aio_utime "path", time, undef; # undef==0 |
|
|
447 | |
|
|
448 | |
|
|
449 | =item aio_chown $fh_or_path, $uid, $gid, $callback->($status) |
|
|
450 | |
|
|
451 | Works like perl's C<chown> function, except that C<undef> for either $uid |
|
|
452 | or $gid is being interpreted as "do not change" (but -1 can also be used). |
|
|
453 | |
|
|
454 | Examples: |
|
|
455 | |
|
|
456 | # same as "chown root path" in the shell: |
|
|
457 | aio_chown "path", 0, -1; |
|
|
458 | # same as above: |
|
|
459 | aio_chown "path", 0, undef; |
|
|
460 | |
|
|
461 | |
|
|
462 | =item aio_truncate $fh_or_path, $offset, $callback->($status) |
|
|
463 | |
|
|
464 | Works like truncate(2) or ftruncate(2). |
|
|
465 | |
|
|
466 | |
|
|
467 | =item aio_chmod $fh_or_path, $mode, $callback->($status) |
|
|
468 | |
|
|
469 | Works like perl's C<chmod> function. |
|
|
470 | |
|
|
471 | |
397 | =item aio_unlink $pathname, $callback->($status) |
472 | =item aio_unlink $pathname, $callback->($status) |
398 | |
473 | |
399 | Asynchronously unlink (delete) a file and call the callback with the |
474 | Asynchronously unlink (delete) a file and call the callback with the |
400 | result code. |
475 | result code. |
401 | |
476 | |
|
|
477 | |
402 | =item aio_mknod $path, $mode, $dev, $callback->($status) |
478 | =item aio_mknod $path, $mode, $dev, $callback->($status) |
403 | |
479 | |
404 | [EXPERIMENTAL] |
480 | [EXPERIMENTAL] |
405 | |
481 | |
406 | Asynchronously create a device node (or fifo). See mknod(2). |
482 | Asynchronously create a device node (or fifo). See mknod(2). |
407 | |
483 | |
408 | The only (POSIX-) portable way of calling this function is: |
484 | The only (POSIX-) portable way of calling this function is: |
409 | |
485 | |
410 | aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ... |
486 | aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ... |
|
|
487 | |
411 | |
488 | |
412 | =item aio_link $srcpath, $dstpath, $callback->($status) |
489 | =item aio_link $srcpath, $dstpath, $callback->($status) |
413 | |
490 | |
414 | Asynchronously create a new link to the existing object at C<$srcpath> at |
491 | Asynchronously create a new link to the existing object at C<$srcpath> at |
415 | the path C<$dstpath> and call the callback with the result code. |
492 | the path C<$dstpath> and call the callback with the result code. |
416 | |
493 | |
|
|
494 | |
417 | =item aio_symlink $srcpath, $dstpath, $callback->($status) |
495 | =item aio_symlink $srcpath, $dstpath, $callback->($status) |
418 | |
496 | |
419 | Asynchronously create a new symbolic link to the existing object at C<$srcpath> at |
497 | Asynchronously create a new symbolic link to the existing object at C<$srcpath> at |
420 | the path C<$dstpath> and call the callback with the result code. |
498 | the path C<$dstpath> and call the callback with the result code. |
421 | |
499 | |
|
|
500 | |
|
|
501 | =item aio_readlink $path, $callback->($link) |
|
|
502 | |
|
|
503 | Asynchronously read the symlink specified by C<$path> and pass it to |
|
|
504 | the callback. If an error occurs, nothing or undef gets passed to the |
|
|
505 | callback. |
|
|
506 | |
|
|
507 | |
422 | =item aio_rename $srcpath, $dstpath, $callback->($status) |
508 | =item aio_rename $srcpath, $dstpath, $callback->($status) |
423 | |
509 | |
424 | Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as |
510 | Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as |
425 | rename(2) and call the callback with the result code. |
511 | rename(2) and call the callback with the result code. |
426 | |
512 | |
|
|
513 | |
|
|
514 | =item aio_mkdir $pathname, $mode, $callback->($status) |
|
|
515 | |
|
|
516 | Asynchronously mkdir (create) a directory and call the callback with |
|
|
517 | the result code. C<$mode> will be modified by the umask at the time the |
|
|
518 | request is executed, so do not change your umask. |
|
|
519 | |
|
|
520 | |
427 | =item aio_rmdir $pathname, $callback->($status) |
521 | =item aio_rmdir $pathname, $callback->($status) |
428 | |
522 | |
429 | Asynchronously rmdir (delete) a directory and call the callback with the |
523 | Asynchronously rmdir (delete) a directory and call the callback with the |
430 | result code. |
524 | result code. |
|
|
525 | |
431 | |
526 | |
432 | =item aio_readdir $pathname, $callback->($entries) |
527 | =item aio_readdir $pathname, $callback->($entries) |
433 | |
528 | |
434 | Unlike the POSIX call of the same name, C<aio_readdir> reads an entire |
529 | Unlike the POSIX call of the same name, C<aio_readdir> reads an entire |
435 | directory (i.e. opendir + readdir + closedir). The entries will not be |
530 | directory (i.e. opendir + readdir + closedir). The entries will not be |
436 | sorted, and will B<NOT> include the C<.> and C<..> entries. |
531 | sorted, and will B<NOT> include the C<.> and C<..> entries. |
437 | |
532 | |
438 | The callback a single argument which is either C<undef> or an array-ref |
533 | The callback a single argument which is either C<undef> or an array-ref |
439 | with the filenames. |
534 | with the filenames. |
|
|
535 | |
|
|
536 | |
|
|
537 | =item aio_load $path, $data, $callback->($status) |
|
|
538 | |
|
|
539 | This is a composite request that tries to fully load the given file into |
|
|
540 | memory. Status is the same as with aio_read. |
|
|
541 | |
|
|
542 | =cut |
|
|
543 | |
|
|
544 | sub aio_load($$;$) { |
|
|
545 | aio_block { |
|
|
546 | my ($path, undef, $cb) = @_; |
|
|
547 | my $data = \$_[1]; |
|
|
548 | |
|
|
549 | my $pri = aioreq_pri; |
|
|
550 | my $grp = aio_group $cb; |
|
|
551 | |
|
|
552 | aioreq_pri $pri; |
|
|
553 | add $grp aio_open $path, O_RDONLY, 0, sub { |
|
|
554 | my $fh = shift |
|
|
555 | or return $grp->result (-1); |
|
|
556 | |
|
|
557 | aioreq_pri $pri; |
|
|
558 | add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub { |
|
|
559 | $grp->result ($_[0]); |
|
|
560 | }; |
|
|
561 | }; |
|
|
562 | |
|
|
563 | $grp |
|
|
564 | } |
|
|
565 | } |
440 | |
566 | |
441 | =item aio_copy $srcpath, $dstpath, $callback->($status) |
567 | =item aio_copy $srcpath, $dstpath, $callback->($status) |
442 | |
568 | |
443 | Try to copy the I<file> (directories not supported as either source or |
569 | Try to copy the I<file> (directories not supported as either source or |
444 | destination) from C<$srcpath> to C<$dstpath> and call the callback with |
570 | destination) from C<$srcpath> to C<$dstpath> and call the callback with |
… | |
… | |
454 | errors are being ignored. |
580 | errors are being ignored. |
455 | |
581 | |
456 | =cut |
582 | =cut |
457 | |
583 | |
458 | sub aio_copy($$;$) { |
584 | sub aio_copy($$;$) { |
|
|
585 | aio_block { |
459 | my ($src, $dst, $cb) = @_; |
586 | my ($src, $dst, $cb) = @_; |
460 | |
587 | |
461 | my $pri = aioreq_pri; |
588 | my $pri = aioreq_pri; |
462 | my $grp = aio_group $cb; |
589 | my $grp = aio_group $cb; |
463 | |
590 | |
464 | aioreq_pri $pri; |
591 | aioreq_pri $pri; |
465 | add $grp aio_open $src, O_RDONLY, 0, sub { |
592 | add $grp aio_open $src, O_RDONLY, 0, sub { |
466 | if (my $src_fh = $_[0]) { |
593 | if (my $src_fh = $_[0]) { |
467 | my @stat = stat $src_fh; |
594 | my @stat = stat $src_fh; |
468 | |
595 | |
469 | aioreq_pri $pri; |
596 | aioreq_pri $pri; |
470 | add $grp aio_open $dst, O_CREAT | O_WRONLY | O_TRUNC, 0200, sub { |
597 | add $grp aio_open $dst, O_CREAT | O_WRONLY | O_TRUNC, 0200, sub { |
471 | if (my $dst_fh = $_[0]) { |
598 | if (my $dst_fh = $_[0]) { |
472 | aioreq_pri $pri; |
599 | aioreq_pri $pri; |
473 | add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { |
600 | add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { |
474 | if ($_[0] == $stat[7]) { |
601 | if ($_[0] == $stat[7]) { |
475 | $grp->result (0); |
602 | $grp->result (0); |
476 | close $src_fh; |
603 | close $src_fh; |
477 | |
604 | |
478 | # those should not normally block. should. should. |
605 | # those should not normally block. should. should. |
479 | utime $stat[8], $stat[9], $dst; |
606 | utime $stat[8], $stat[9], $dst; |
480 | chmod $stat[2] & 07777, $dst_fh; |
607 | chmod $stat[2] & 07777, $dst_fh; |
481 | chown $stat[4], $stat[5], $dst_fh; |
608 | chown $stat[4], $stat[5], $dst_fh; |
|
|
609 | |
|
|
610 | aioreq_pri $pri; |
482 | close $dst_fh; |
611 | add $grp aio_close $dst_fh; |
483 | } else { |
612 | } else { |
484 | $grp->result (-1); |
613 | $grp->result (-1); |
485 | close $src_fh; |
614 | close $src_fh; |
486 | close $dst_fh; |
615 | close $dst_fh; |
487 | |
616 | |
488 | aioreq $pri; |
617 | aioreq $pri; |
489 | add $grp aio_unlink $dst; |
618 | add $grp aio_unlink $dst; |
|
|
619 | } |
490 | } |
620 | }; |
|
|
621 | } else { |
|
|
622 | $grp->result (-1); |
491 | }; |
623 | } |
492 | } else { |
|
|
493 | $grp->result (-1); |
|
|
494 | } |
624 | }, |
|
|
625 | |
|
|
626 | } else { |
|
|
627 | $grp->result (-1); |
495 | }, |
628 | } |
496 | |
|
|
497 | } else { |
|
|
498 | $grp->result (-1); |
|
|
499 | } |
629 | }; |
|
|
630 | |
|
|
631 | $grp |
500 | }; |
632 | } |
501 | |
|
|
502 | $grp |
|
|
503 | } |
633 | } |
504 | |
634 | |
505 | =item aio_move $srcpath, $dstpath, $callback->($status) |
635 | =item aio_move $srcpath, $dstpath, $callback->($status) |
506 | |
636 | |
507 | Try to move the I<file> (directories not supported as either source or |
637 | Try to move the I<file> (directories not supported as either source or |
… | |
… | |
513 | that is successful, unlinking the C<$srcpath>. |
643 | that is successful, unlinking the C<$srcpath>. |
514 | |
644 | |
515 | =cut |
645 | =cut |
516 | |
646 | |
517 | sub aio_move($$;$) { |
647 | sub aio_move($$;$) { |
|
|
648 | aio_block { |
518 | my ($src, $dst, $cb) = @_; |
649 | my ($src, $dst, $cb) = @_; |
519 | |
650 | |
520 | my $pri = aioreq_pri; |
651 | my $pri = aioreq_pri; |
521 | my $grp = aio_group $cb; |
652 | my $grp = aio_group $cb; |
522 | |
653 | |
523 | aioreq_pri $pri; |
654 | aioreq_pri $pri; |
524 | add $grp aio_rename $src, $dst, sub { |
655 | add $grp aio_rename $src, $dst, sub { |
525 | if ($_[0] && $! == EXDEV) { |
656 | if ($_[0] && $! == EXDEV) { |
526 | aioreq_pri $pri; |
657 | aioreq_pri $pri; |
527 | add $grp aio_copy $src, $dst, sub { |
658 | add $grp aio_copy $src, $dst, sub { |
|
|
659 | $grp->result ($_[0]); |
|
|
660 | |
|
|
661 | if (!$_[0]) { |
|
|
662 | aioreq_pri $pri; |
|
|
663 | add $grp aio_unlink $src; |
|
|
664 | } |
|
|
665 | }; |
|
|
666 | } else { |
528 | $grp->result ($_[0]); |
667 | $grp->result ($_[0]); |
529 | |
|
|
530 | if (!$_[0]) { |
|
|
531 | aioreq_pri $pri; |
|
|
532 | add $grp aio_unlink $src; |
|
|
533 | } |
|
|
534 | }; |
668 | } |
535 | } else { |
|
|
536 | $grp->result ($_[0]); |
|
|
537 | } |
669 | }; |
|
|
670 | |
|
|
671 | $grp |
538 | }; |
672 | } |
539 | |
|
|
540 | $grp |
|
|
541 | } |
673 | } |
542 | |
674 | |
543 | =item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) |
675 | =item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) |
544 | |
676 | |
545 | Scans a directory (similar to C<aio_readdir>) but additionally tries to |
677 | Scans a directory (similar to C<aio_readdir>) but additionally tries to |
… | |
… | |
592 | as those tend to return 0 or 1 as link counts, which disables the |
724 | as those tend to return 0 or 1 as link counts, which disables the |
593 | directory counting heuristic. |
725 | directory counting heuristic. |
594 | |
726 | |
595 | =cut |
727 | =cut |
596 | |
728 | |
597 | sub aio_scandir($$$) { |
729 | sub aio_scandir($$;$) { |
|
|
730 | aio_block { |
598 | my ($path, $maxreq, $cb) = @_; |
731 | my ($path, $maxreq, $cb) = @_; |
599 | |
732 | |
600 | my $pri = aioreq_pri; |
733 | my $pri = aioreq_pri; |
601 | |
734 | |
602 | my $grp = aio_group $cb; |
735 | my $grp = aio_group $cb; |
603 | |
736 | |
604 | $maxreq = 4 if $maxreq <= 0; |
737 | $maxreq = 4 if $maxreq <= 0; |
605 | |
738 | |
606 | # stat once |
739 | # 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; |
740 | aioreq_pri $pri; |
615 | add $grp aio_readdir $path, sub { |
741 | add $grp aio_stat $path, sub { |
616 | my $entries = shift |
|
|
617 | or return $grp->result (); |
742 | return $grp->result () if $_[0]; |
|
|
743 | my $now = time; |
|
|
744 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
618 | |
745 | |
619 | # stat the dir another time |
746 | # read the directory entries |
620 | aioreq_pri $pri; |
747 | aioreq_pri $pri; |
|
|
748 | add $grp aio_readdir $path, sub { |
|
|
749 | my $entries = shift |
|
|
750 | or return $grp->result (); |
|
|
751 | |
|
|
752 | # stat the dir another time |
|
|
753 | aioreq_pri $pri; |
621 | add $grp aio_stat $path, sub { |
754 | add $grp aio_stat $path, sub { |
622 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
755 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
623 | |
756 | |
624 | my $ndirs; |
757 | my $ndirs; |
625 | |
758 | |
626 | # take the slow route if anything looks fishy |
759 | # take the slow route if anything looks fishy |
627 | if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
760 | if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
628 | $ndirs = -1; |
761 | $ndirs = -1; |
629 | } else { |
762 | } else { |
630 | # if nlink == 2, we are finished |
763 | # if nlink == 2, we are finished |
631 | # on non-posix-fs's, we rely on nlink < 2 |
764 | # on non-posix-fs's, we rely on nlink < 2 |
632 | $ndirs = (stat _)[3] - 2 |
765 | $ndirs = (stat _)[3] - 2 |
633 | or return $grp->result ([], $entries); |
766 | or return $grp->result ([], $entries); |
634 | } |
767 | } |
635 | |
768 | |
636 | # sort into likely dirs and likely nondirs |
769 | # sort into likely dirs and likely nondirs |
637 | # dirs == files without ".", short entries first |
770 | # dirs == files without ".", short entries first |
638 | $entries = [map $_->[0], |
771 | $entries = [map $_->[0], |
639 | sort { $b->[1] cmp $a->[1] } |
772 | sort { $b->[1] cmp $a->[1] } |
640 | map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length], |
773 | map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length], |
641 | @$entries]; |
774 | @$entries]; |
642 | |
775 | |
643 | my (@dirs, @nondirs); |
776 | my (@dirs, @nondirs); |
644 | |
777 | |
645 | my $statgrp = add $grp aio_group sub { |
778 | my $statgrp = add $grp aio_group sub { |
646 | $grp->result (\@dirs, \@nondirs); |
779 | $grp->result (\@dirs, \@nondirs); |
647 | }; |
780 | }; |
648 | |
781 | |
649 | limit $statgrp $maxreq; |
782 | limit $statgrp $maxreq; |
650 | feed $statgrp sub { |
783 | feed $statgrp sub { |
651 | return unless @$entries; |
784 | return unless @$entries; |
652 | my $entry = pop @$entries; |
785 | my $entry = pop @$entries; |
653 | |
786 | |
654 | aioreq_pri $pri; |
787 | aioreq_pri $pri; |
655 | add $statgrp aio_stat "$path/$entry/.", sub { |
788 | add $statgrp aio_stat "$path/$entry/.", sub { |
656 | if ($_[0] < 0) { |
789 | if ($_[0] < 0) { |
657 | push @nondirs, $entry; |
790 | push @nondirs, $entry; |
658 | } else { |
791 | } else { |
659 | # need to check for real directory |
792 | # need to check for real directory |
660 | aioreq_pri $pri; |
793 | aioreq_pri $pri; |
661 | add $statgrp aio_lstat "$path/$entry", sub { |
794 | add $statgrp aio_lstat "$path/$entry", sub { |
662 | if (-d _) { |
795 | if (-d _) { |
663 | push @dirs, $entry; |
796 | push @dirs, $entry; |
664 | |
797 | |
665 | unless (--$ndirs) { |
798 | unless (--$ndirs) { |
666 | push @nondirs, @$entries; |
799 | push @nondirs, @$entries; |
667 | feed $statgrp; |
800 | feed $statgrp; |
|
|
801 | } |
|
|
802 | } else { |
|
|
803 | push @nondirs, $entry; |
668 | } |
804 | } |
669 | } else { |
|
|
670 | push @nondirs, $entry; |
|
|
671 | } |
805 | } |
672 | } |
806 | } |
673 | } |
807 | }; |
674 | }; |
808 | }; |
675 | }; |
809 | }; |
676 | }; |
810 | }; |
677 | }; |
811 | }; |
|
|
812 | |
|
|
813 | $grp |
678 | }; |
814 | } |
679 | |
|
|
680 | $grp |
|
|
681 | } |
815 | } |
|
|
816 | |
|
|
817 | =item aio_rmtree $path, $callback->($status) |
|
|
818 | |
|
|
819 | Delete a directory tree starting (and including) C<$path>, return the |
|
|
820 | status of the final C<rmdir> only. This is a composite request that |
|
|
821 | uses C<aio_scandir> to recurse into and rmdir directories, and unlink |
|
|
822 | everything else. |
|
|
823 | |
|
|
824 | =cut |
|
|
825 | |
|
|
826 | sub aio_rmtree; |
|
|
827 | sub aio_rmtree($;$) { |
|
|
828 | aio_block { |
|
|
829 | my ($path, $cb) = @_; |
|
|
830 | |
|
|
831 | my $pri = aioreq_pri; |
|
|
832 | my $grp = aio_group $cb; |
|
|
833 | |
|
|
834 | aioreq_pri $pri; |
|
|
835 | add $grp aio_scandir $path, 0, sub { |
|
|
836 | my ($dirs, $nondirs) = @_; |
|
|
837 | |
|
|
838 | my $dirgrp = aio_group sub { |
|
|
839 | add $grp aio_rmdir $path, sub { |
|
|
840 | $grp->result ($_[0]); |
|
|
841 | }; |
|
|
842 | }; |
|
|
843 | |
|
|
844 | (aioreq_pri $pri), add $dirgrp aio_rmtree "$path/$_" for @$dirs; |
|
|
845 | (aioreq_pri $pri), add $dirgrp aio_unlink "$path/$_" for @$nondirs; |
|
|
846 | |
|
|
847 | add $grp $dirgrp; |
|
|
848 | }; |
|
|
849 | |
|
|
850 | $grp |
|
|
851 | } |
|
|
852 | } |
|
|
853 | |
|
|
854 | =item aio_sync $callback->($status) |
|
|
855 | |
|
|
856 | Asynchronously call sync and call the callback when finished. |
682 | |
857 | |
683 | =item aio_fsync $fh, $callback->($status) |
858 | =item aio_fsync $fh, $callback->($status) |
684 | |
859 | |
685 | Asynchronously call fsync on the given filehandle and call the callback |
860 | Asynchronously call fsync on the given filehandle and call the callback |
686 | with the fsync result code. |
861 | with the fsync result code. |
… | |
… | |
690 | Asynchronously call fdatasync on the given filehandle and call the |
865 | Asynchronously call fdatasync on the given filehandle and call the |
691 | callback with the fdatasync result code. |
866 | callback with the fdatasync result code. |
692 | |
867 | |
693 | If this call isn't available because your OS lacks it or it couldn't be |
868 | If this call isn't available because your OS lacks it or it couldn't be |
694 | detected, it will be emulated by calling C<fsync> instead. |
869 | detected, it will be emulated by calling C<fsync> instead. |
|
|
870 | |
|
|
871 | =item aio_pathsync $path, $callback->($status) |
|
|
872 | |
|
|
873 | This request tries to open, fsync and close the given path. This is a |
|
|
874 | composite request intended tosync directories after directory operations |
|
|
875 | (E.g. rename). This might not work on all operating systems or have any |
|
|
876 | specific effect, but usually it makes sure that directory changes get |
|
|
877 | written to disc. It works for anything that can be opened for read-only, |
|
|
878 | not just directories. |
|
|
879 | |
|
|
880 | Passes C<0> when everything went ok, and C<-1> on error. |
|
|
881 | |
|
|
882 | =cut |
|
|
883 | |
|
|
884 | sub aio_pathsync($;$) { |
|
|
885 | aio_block { |
|
|
886 | my ($path, $cb) = @_; |
|
|
887 | |
|
|
888 | my $pri = aioreq_pri; |
|
|
889 | my $grp = aio_group $cb; |
|
|
890 | |
|
|
891 | aioreq_pri $pri; |
|
|
892 | add $grp aio_open $path, O_RDONLY, 0, sub { |
|
|
893 | my ($fh) = @_; |
|
|
894 | if ($fh) { |
|
|
895 | aioreq_pri $pri; |
|
|
896 | add $grp aio_fsync $fh, sub { |
|
|
897 | $grp->result ($_[0]); |
|
|
898 | |
|
|
899 | aioreq_pri $pri; |
|
|
900 | add $grp aio_close $fh; |
|
|
901 | }; |
|
|
902 | } else { |
|
|
903 | $grp->result (-1); |
|
|
904 | } |
|
|
905 | }; |
|
|
906 | |
|
|
907 | $grp |
|
|
908 | } |
|
|
909 | } |
695 | |
910 | |
696 | =item aio_group $callback->(...) |
911 | =item aio_group $callback->(...) |
697 | |
912 | |
698 | This is a very special aio request: Instead of doing something, it is a |
913 | This is a very special aio request: Instead of doing something, it is a |
699 | container for other aio requests, which is useful if you want to bundle |
914 | container for other aio requests, which is useful if you want to bundle |
… | |
… | |
836 | itself. Useful when you queued a lot of events but got a result early. |
1051 | itself. Useful when you queued a lot of events but got a result early. |
837 | |
1052 | |
838 | =item $grp->result (...) |
1053 | =item $grp->result (...) |
839 | |
1054 | |
840 | Set the result value(s) that will be passed to the group callback when all |
1055 | Set the result value(s) that will be passed to the group callback when all |
841 | subrequests have finished and set thre groups errno to the current value |
1056 | subrequests have finished and set the groups errno to the current value |
842 | of errno (just like calling C<errno> without an error number). By default, |
1057 | of errno (just like calling C<errno> without an error number). By default, |
843 | no argument will be passed and errno is zero. |
1058 | no argument will be passed and errno is zero. |
844 | |
1059 | |
845 | =item $grp->errno ([$errno]) |
1060 | =item $grp->errno ([$errno]) |
846 | |
1061 | |
… | |
… | |
939 | that are being processed by C<IO::AIO::poll_cb> in one call, respectively |
1154 | that are being processed by C<IO::AIO::poll_cb> in one call, respectively |
940 | the maximum amount of time (default C<0>, meaning infinity) spent in |
1155 | the maximum amount of time (default C<0>, meaning infinity) spent in |
941 | C<IO::AIO::poll_cb> to process requests (more correctly the mininum amount |
1156 | C<IO::AIO::poll_cb> to process requests (more correctly the mininum amount |
942 | of time C<poll_cb> is allowed to use). |
1157 | of time C<poll_cb> is allowed to use). |
943 | |
1158 | |
|
|
1159 | Setting C<max_poll_time> to a non-zero value creates an overhead of one |
|
|
1160 | syscall per request processed, which is not normally a problem unless your |
|
|
1161 | callbacks are really really fast or your OS is really really slow (I am |
|
|
1162 | not mentioning Solaris here). Using C<max_poll_reqs> incurs no overhead. |
|
|
1163 | |
944 | Setting these is useful if you want to ensure some level of |
1164 | Setting these is useful if you want to ensure some level of |
945 | interactiveness when perl is not fast enough to process all requests in |
1165 | interactiveness when perl is not fast enough to process all requests in |
946 | time. |
1166 | time. |
947 | |
1167 | |
948 | For interactive programs, values such as C<0.01> to C<0.1> should be fine. |
1168 | For interactive programs, values such as C<0.01> to C<0.1> should be fine. |
949 | |
1169 | |
950 | Example: Install an Event watcher that automatically calls |
1170 | Example: Install an Event watcher that automatically calls |
951 | IO::AIO::poll_some with low priority, to ensure that other parts of the |
1171 | IO::AIO::poll_cb with low priority, to ensure that other parts of the |
952 | program get the CPU sometimes even under high AIO load. |
1172 | program get the CPU sometimes even under high AIO load. |
953 | |
1173 | |
954 | # try not to spend much more than 0.1s in poll_cb |
1174 | # try not to spend much more than 0.1s in poll_cb |
955 | IO::AIO::max_poll_time 0.1; |
1175 | IO::AIO::max_poll_time 0.1; |
956 | |
1176 | |
… | |
… | |
959 | poll => 'r', nice => 1, |
1179 | poll => 'r', nice => 1, |
960 | cb => &IO::AIO::poll_cb); |
1180 | cb => &IO::AIO::poll_cb); |
961 | |
1181 | |
962 | =item IO::AIO::poll_wait |
1182 | =item IO::AIO::poll_wait |
963 | |
1183 | |
|
|
1184 | If there are any outstanding requests and none of them in the result |
964 | Wait till the result filehandle becomes ready for reading (simply does a |
1185 | phase, wait till the result filehandle becomes ready for reading (simply |
965 | C<select> on the filehandle. This is useful if you want to synchronously |
1186 | does a C<select> on the filehandle. This is useful if you want to |
966 | wait for some requests to finish). |
1187 | synchronously wait for some requests to finish). |
967 | |
1188 | |
968 | See C<nreqs> for an example. |
1189 | See C<nreqs> for an example. |
969 | |
1190 | |
970 | =item IO::AIO::poll |
1191 | =item IO::AIO::poll |
971 | |
1192 | |
972 | Waits until some requests have been handled. |
1193 | Waits until some requests have been handled. |
973 | |
1194 | |
|
|
1195 | Returns the number of requests processed, but is otherwise strictly |
974 | Strictly equivalent to: |
1196 | equivalent to: |
975 | |
1197 | |
976 | IO::AIO::poll_wait, IO::AIO::poll_cb |
1198 | IO::AIO::poll_wait, IO::AIO::poll_cb |
977 | if IO::AIO::nreqs; |
|
|
978 | |
1199 | |
979 | =item IO::AIO::flush |
1200 | =item IO::AIO::flush |
980 | |
1201 | |
981 | Wait till all outstanding AIO requests have been handled. |
1202 | Wait till all outstanding AIO requests have been handled. |
982 | |
1203 | |
983 | Strictly equivalent to: |
1204 | Strictly equivalent to: |
984 | |
1205 | |
985 | IO::AIO::poll_wait, IO::AIO::poll_cb |
1206 | IO::AIO::poll_wait, IO::AIO::poll_cb |
986 | while IO::AIO::nreqs; |
1207 | while IO::AIO::nreqs; |
987 | |
1208 | |
|
|
1209 | =back |
|
|
1210 | |
988 | =head3 CONTROLLING THE NUMBER OF THREADS |
1211 | =head3 CONTROLLING THE NUMBER OF THREADS |
|
|
1212 | |
|
|
1213 | =over |
989 | |
1214 | |
990 | =item IO::AIO::min_parallel $nthreads |
1215 | =item IO::AIO::min_parallel $nthreads |
991 | |
1216 | |
992 | Set the minimum number of AIO threads to C<$nthreads>. The current |
1217 | Set the minimum number of AIO threads to C<$nthreads>. The current |
993 | default is C<8>, which means eight asynchronous operations can execute |
1218 | default is C<8>, which means eight asynchronous operations can execute |
… | |
… | |
1041 | This is a very bad function to use in interactive programs because it |
1266 | This is a very bad function to use in interactive programs because it |
1042 | blocks, and a bad way to reduce concurrency because it is inexact: Better |
1267 | blocks, and a bad way to reduce concurrency because it is inexact: Better |
1043 | use an C<aio_group> together with a feed callback. |
1268 | use an C<aio_group> together with a feed callback. |
1044 | |
1269 | |
1045 | Sets the maximum number of outstanding requests to C<$nreqs>. If you |
1270 | Sets the maximum number of outstanding requests to C<$nreqs>. If you |
1046 | to queue up more than this number of requests, the next call to the |
1271 | do queue up more than this number of requests, the next call to the |
1047 | C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>) |
1272 | C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>) |
1048 | function will block until the limit is no longer exceeded. |
1273 | function will block until the limit is no longer exceeded. |
1049 | |
1274 | |
1050 | The default value is very large, so there is no practical limit on the |
1275 | The default value is very large, so there is no practical limit on the |
1051 | number of outstanding requests. |
1276 | number of outstanding requests. |
1052 | |
1277 | |
1053 | You can still queue as many requests as you want. Therefore, |
1278 | You can still queue as many requests as you want. Therefore, |
1054 | C<max_oustsanding> is mainly useful in simple scripts (with low values) or |
1279 | C<max_oustsanding> is mainly useful in simple scripts (with low values) or |
1055 | as a stop gap to shield against fatal memory overflow (with large values). |
1280 | as a stop gap to shield against fatal memory overflow (with large values). |
1056 | |
1281 | |
|
|
1282 | =back |
|
|
1283 | |
1057 | =head3 STATISTICAL INFORMATION |
1284 | =head3 STATISTICAL INFORMATION |
|
|
1285 | |
|
|
1286 | =over |
1058 | |
1287 | |
1059 | =item IO::AIO::nreqs |
1288 | =item IO::AIO::nreqs |
1060 | |
1289 | |
1061 | Returns the number of requests currently in the ready, execute or pending |
1290 | Returns the number of requests currently in the ready, execute or pending |
1062 | states (i.e. for which their callback has not been invoked yet). |
1291 | states (i.e. for which their callback has not been invoked yet). |
… | |
… | |
1078 | |
1307 | |
1079 | =back |
1308 | =back |
1080 | |
1309 | |
1081 | =cut |
1310 | =cut |
1082 | |
1311 | |
1083 | # support function to convert a fd into a perl filehandle |
|
|
1084 | sub _fd2fh { |
|
|
1085 | return undef if $_[0] < 0; |
|
|
1086 | |
|
|
1087 | # try to generate nice filehandles |
|
|
1088 | my $sym = "IO::AIO::fd#$_[0]"; |
|
|
1089 | local *$sym; |
|
|
1090 | |
|
|
1091 | open *$sym, "+<&=$_[0]" # usually works under any unix |
|
|
1092 | or open *$sym, "<&=$_[0]" # cygwin needs this |
|
|
1093 | or open *$sym, ">&=$_[0]" # or this |
|
|
1094 | or return undef; |
|
|
1095 | |
|
|
1096 | *$sym |
|
|
1097 | } |
|
|
1098 | |
|
|
1099 | min_parallel 8; |
1312 | min_parallel 8; |
1100 | |
1313 | |
1101 | END { |
1314 | END { flush } |
1102 | min_parallel 1; |
|
|
1103 | flush; |
|
|
1104 | }; |
|
|
1105 | |
1315 | |
1106 | 1; |
1316 | 1; |
1107 | |
1317 | |
1108 | =head2 FORK BEHAVIOUR |
1318 | =head2 FORK BEHAVIOUR |
1109 | |
1319 | |
… | |
… | |
1129 | bytes of memory. In addition, stat requests need a stat buffer (possibly |
1339 | bytes of memory. In addition, stat requests need a stat buffer (possibly |
1130 | a few hundred bytes), readdir requires a result buffer and so on. Perl |
1340 | a few hundred bytes), readdir requires a result buffer and so on. Perl |
1131 | scalars and other data passed into aio requests will also be locked and |
1341 | scalars and other data passed into aio requests will also be locked and |
1132 | will consume memory till the request has entered the done state. |
1342 | will consume memory till the request has entered the done state. |
1133 | |
1343 | |
1134 | This is now awfully much, so queuing lots of requests is not usually a |
1344 | This is not awfully much, so queuing lots of requests is not usually a |
1135 | problem. |
1345 | problem. |
1136 | |
1346 | |
1137 | Per-thread usage: |
1347 | Per-thread usage: |
1138 | |
1348 | |
1139 | In the execution phase, some aio requests require more memory for |
1349 | In the execution phase, some aio requests require more memory for |