… | |
… | |
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 | |
|
|
31 | # AnyEvent integration (EV, Event, Glib, Tk, POE, urxvt, pureperl...) |
|
|
32 | use AnyEvent::AIO; |
|
|
33 | |
30 | # AnyEvent integration |
34 | # EV integration |
31 | open my $fh, "<&=" . IO::AIO::poll_fileno or die "$!"; |
35 | my $w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb; |
32 | my $w = AnyEvent->io (fh => $fh, poll => 'r', cb => sub { IO::AIO::poll_cb }); |
|
|
33 | |
36 | |
34 | # Event integration |
37 | # Event integration |
35 | Event->io (fd => IO::AIO::poll_fileno, |
38 | Event->io (fd => IO::AIO::poll_fileno, |
36 | poll => 'r', |
39 | poll => 'r', |
37 | cb => \&IO::AIO::poll_cb); |
40 | cb => \&IO::AIO::poll_cb); |
… | |
… | |
61 | etc.), but can also be used to easily do operations in parallel that are |
64 | 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 |
65 | 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 |
66 | on a RAID volume or over NFS when you do a number of stat operations |
64 | concurrently. |
67 | concurrently. |
65 | |
68 | |
66 | While most of this works on all types of file descriptors (for example |
69 | While most of this works on all types of file descriptors (for |
67 | sockets), using these functions on file descriptors that support |
70 | example sockets), using these functions on file descriptors that |
68 | nonblocking operation (again, sockets, pipes etc.) is very inefficient or |
71 | support nonblocking operation (again, sockets, pipes etc.) is very |
69 | might not work (aio_read fails on sockets/pipes/fifos). Use an event loop |
72 | inefficient. Use an event loop for that (such as the L<Event|Event> |
70 | for that (such as the L<Event|Event> module): IO::AIO will naturally fit |
73 | module): IO::AIO will naturally fit into such an event loop itself. |
71 | into such an event loop itself. |
|
|
72 | |
74 | |
73 | In this version, a number of threads are started that execute your |
75 | In this version, a number of threads are started that execute your |
74 | requests and signal their completion. You don't need thread support |
76 | requests and signal their completion. You don't need thread support |
75 | in perl, and the threads created by this module will not be visible |
77 | in perl, and the threads created by this module will not be visible |
76 | to perl. In the future, this module might make use of the native aio |
78 | to perl. In the future, this module might make use of the native aio |
… | |
… | |
78 | not well-supported or restricted (GNU/Linux doesn't allow them on normal |
80 | not well-supported or restricted (GNU/Linux doesn't allow them on normal |
79 | files currently, for example), and they would only support aio_read and |
81 | files currently, for example), and they would only support aio_read and |
80 | aio_write, so the remaining functionality would have to be implemented |
82 | aio_write, so the remaining functionality would have to be implemented |
81 | using threads anyway. |
83 | using threads anyway. |
82 | |
84 | |
83 | Although the module will work with in the presence of other (Perl-) |
85 | Although the module will work in the presence of other (Perl-) threads, |
84 | threads, it is currently not reentrant in any way, so use appropriate |
86 | it is currently not reentrant in any way, so use appropriate locking |
85 | locking yourself, always call C<poll_cb> from within the same thread, or |
87 | yourself, always call C<poll_cb> from within the same thread, or never |
86 | never call C<poll_cb> (or other C<aio_> functions) recursively. |
88 | call C<poll_cb> (or other C<aio_> functions) recursively. |
87 | |
89 | |
88 | =head2 EXAMPLE |
90 | =head2 EXAMPLE |
89 | |
91 | |
90 | This is a simple example that uses the Event module and loads |
92 | This is a simple example that uses the Event module and loads |
91 | F</etc/passwd> asynchronously: |
93 | F</etc/passwd> asynchronously: |
… | |
… | |
99 | poll => 'r', |
101 | poll => 'r', |
100 | cb => \&IO::AIO::poll_cb); |
102 | cb => \&IO::AIO::poll_cb); |
101 | |
103 | |
102 | # queue the request to open /etc/passwd |
104 | # queue the request to open /etc/passwd |
103 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
105 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
104 | my $fh = $_[0] |
106 | my $fh = shift |
105 | or die "error while opening: $!"; |
107 | or die "error while opening: $!"; |
106 | |
108 | |
107 | # stat'ing filehandles is generally non-blocking |
109 | # stat'ing filehandles is generally non-blocking |
108 | my $size = -s $fh; |
110 | my $size = -s $fh; |
109 | |
111 | |
… | |
… | |
183 | |
185 | |
184 | =cut |
186 | =cut |
185 | |
187 | |
186 | package IO::AIO; |
188 | package IO::AIO; |
187 | |
189 | |
|
|
190 | use Carp (); |
|
|
191 | |
188 | no warnings; |
192 | no warnings; |
189 | use strict 'vars'; |
193 | use strict 'vars'; |
190 | |
194 | |
191 | use base 'Exporter'; |
195 | use base 'Exporter'; |
192 | |
196 | |
193 | BEGIN { |
197 | BEGIN { |
194 | our $VERSION = '2.2'; |
198 | our $VERSION = '3.17'; |
195 | |
199 | |
196 | our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat |
200 | our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close |
197 | aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink |
201 | aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir |
198 | aio_readlink aio_fsync aio_fdatasync aio_readahead aio_rename aio_link |
202 | aio_scandir aio_symlink aio_readlink aio_sync aio_fsync |
199 | aio_move aio_copy aio_group aio_nop aio_mknod); |
203 | aio_fdatasync aio_sync_file_range aio_pathsync aio_readahead |
|
|
204 | aio_rename aio_link aio_move aio_copy aio_group |
|
|
205 | aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown |
|
|
206 | aio_chmod aio_utime aio_truncate); |
|
|
207 | |
200 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); |
208 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); |
201 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
209 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
202 | min_parallel max_parallel max_idle |
210 | min_parallel max_parallel max_idle |
203 | nreqs nready npending nthreads |
211 | nreqs nready npending nthreads |
204 | max_poll_time max_poll_reqs); |
212 | max_poll_time max_poll_reqs); |
205 | |
213 | |
|
|
214 | push @AIO_REQ, qw(aio_busy); # not exported |
|
|
215 | |
206 | @IO::AIO::GRP::ISA = 'IO::AIO::REQ'; |
216 | @IO::AIO::GRP::ISA = 'IO::AIO::REQ'; |
207 | |
217 | |
208 | require XSLoader; |
218 | require XSLoader; |
209 | XSLoader::load ("IO::AIO", $VERSION); |
219 | XSLoader::load ("IO::AIO", $VERSION); |
210 | } |
220 | } |
… | |
… | |
216 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
226 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
217 | with the same name (sans C<aio_>). The arguments are similar or identical, |
227 | with the same name (sans C<aio_>). The arguments are similar or identical, |
218 | and they all accept an additional (and optional) C<$callback> argument |
228 | and they all accept an additional (and optional) C<$callback> argument |
219 | which must be a code reference. This code reference will get called with |
229 | which must be a code reference. This code reference will get called with |
220 | the syscall return code (e.g. most syscalls return C<-1> on error, unlike |
230 | the syscall return code (e.g. most syscalls return C<-1> on error, unlike |
221 | perl, which usually delivers "false") as it's sole argument when the given |
231 | perl, which usually delivers "false") as its sole argument after the given |
222 | syscall has been executed asynchronously. |
232 | syscall has been executed asynchronously. |
223 | |
233 | |
224 | All functions expecting a filehandle keep a copy of the filehandle |
234 | All functions expecting a filehandle keep a copy of the filehandle |
225 | internally until the request has finished. |
235 | internally until the request has finished. |
226 | |
236 | |
… | |
… | |
240 | your pathnames to the locale (or other) encoding in effect in the user |
250 | your pathnames to the locale (or other) encoding in effect in the user |
241 | environment, d) use Glib::filename_from_unicode on unicode filenames or e) |
251 | environment, d) use Glib::filename_from_unicode on unicode filenames or e) |
242 | use something else to ensure your scalar has the correct contents. |
252 | use something else to ensure your scalar has the correct contents. |
243 | |
253 | |
244 | This works, btw. independent of the internal UTF-8 bit, which IO::AIO |
254 | This works, btw. independent of the internal UTF-8 bit, which IO::AIO |
245 | handles correctly wether it is set or not. |
255 | handles correctly whether it is set or not. |
246 | |
256 | |
247 | =over 4 |
257 | =over 4 |
248 | |
258 | |
249 | =item $prev_pri = aioreq_pri [$pri] |
259 | =item $prev_pri = aioreq_pri [$pri] |
250 | |
260 | |
… | |
… | |
270 | aio_read $_[0], ..., sub { |
280 | aio_read $_[0], ..., sub { |
271 | ... |
281 | ... |
272 | }; |
282 | }; |
273 | }; |
283 | }; |
274 | |
284 | |
|
|
285 | |
275 | =item aioreq_nice $pri_adjust |
286 | =item aioreq_nice $pri_adjust |
276 | |
287 | |
277 | Similar to C<aioreq_pri>, but subtracts the given value from the current |
288 | Similar to C<aioreq_pri>, but subtracts the given value from the current |
278 | priority, so the effect is cumulative. |
289 | priority, so the effect is cumulative. |
|
|
290 | |
279 | |
291 | |
280 | =item aio_open $pathname, $flags, $mode, $callback->($fh) |
292 | =item aio_open $pathname, $flags, $mode, $callback->($fh) |
281 | |
293 | |
282 | Asynchronously open or create a file and call the callback with a newly |
294 | Asynchronously open or create a file and call the callback with a newly |
283 | created filehandle for the file. |
295 | created filehandle for the file. |
… | |
… | |
289 | list. They are the same as used by C<sysopen>. |
301 | list. They are the same as used by C<sysopen>. |
290 | |
302 | |
291 | Likewise, C<$mode> specifies the mode of the newly created file, if it |
303 | Likewise, C<$mode> specifies the mode of the newly created file, if it |
292 | didn't exist and C<O_CREAT> has been given, just like perl's C<sysopen>, |
304 | didn't exist and C<O_CREAT> has been given, just like perl's C<sysopen>, |
293 | except that it is mandatory (i.e. use C<0> if you don't create new files, |
305 | except that it is mandatory (i.e. use C<0> if you don't create new files, |
294 | and C<0666> or C<0777> if you do). |
306 | and C<0666> or C<0777> if you do). Note that the C<$mode> will be modified |
|
|
307 | by the umask in effect then the request is being executed, so better never |
|
|
308 | change the umask. |
295 | |
309 | |
296 | Example: |
310 | Example: |
297 | |
311 | |
298 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
312 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
299 | if ($_[0]) { |
313 | if ($_[0]) { |
… | |
… | |
302 | } else { |
316 | } else { |
303 | die "open failed: $!\n"; |
317 | die "open failed: $!\n"; |
304 | } |
318 | } |
305 | }; |
319 | }; |
306 | |
320 | |
|
|
321 | |
307 | =item aio_close $fh, $callback->($status) |
322 | =item aio_close $fh, $callback->($status) |
308 | |
323 | |
309 | Asynchronously close a file and call the callback with the result |
324 | Asynchronously close a file and call the callback with the result |
310 | code. I<WARNING:> although accepted, you should not pass in a perl |
325 | code. |
311 | filehandle here, as perl will likely close the file descriptor another |
|
|
312 | time when the filehandle is destroyed. Normally, you can safely call perls |
|
|
313 | C<close> or just let filehandles go out of scope. |
|
|
314 | |
326 | |
315 | This is supposed to be a bug in the API, so that might change. It's |
327 | Unfortunately, you can't do this to perl. Perl I<insists> very strongly on |
316 | therefore best to avoid this function. |
328 | closing the file descriptor associated with the filehandle itself. |
|
|
329 | |
|
|
330 | Therefore, C<aio_close> will not close the filehandle - instead it will |
|
|
331 | use dup2 to overwrite the file descriptor with the write-end of a pipe |
|
|
332 | (the pipe fd will be created on demand and will be cached). |
|
|
333 | |
|
|
334 | Or in other words: the file descriptor will be closed, but it will not be |
|
|
335 | free for reuse until the perl filehandle is closed. |
|
|
336 | |
|
|
337 | =cut |
317 | |
338 | |
318 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
339 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
319 | |
340 | |
320 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
341 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
321 | |
342 | |
322 | Reads or writes C<length> bytes from the specified C<fh> and C<offset> |
343 | Reads or writes C<$length> bytes from the specified C<$fh> and C<$offset> |
323 | into the scalar given by C<data> and offset C<dataoffset> and calls the |
344 | into the scalar given by C<$data> and offset C<$dataoffset> and calls the |
324 | callback without the actual number of bytes read (or -1 on error, just |
345 | callback without the actual number of bytes read (or -1 on error, just |
325 | like the syscall). |
346 | like the syscall). |
326 | |
347 | |
|
|
348 | If C<$offset> is undefined, then the current file descriptor offset will |
|
|
349 | be used (and updated), otherwise the file descriptor offset will not be |
|
|
350 | changed by these calls. |
|
|
351 | |
|
|
352 | If C<$length> is undefined in C<aio_write>, use the remaining length of C<$data>. |
|
|
353 | |
|
|
354 | If C<$dataoffset> is less than zero, it will be counted from the end of |
|
|
355 | C<$data>. |
|
|
356 | |
327 | The C<$data> scalar I<MUST NOT> be modified in any way while the request |
357 | The C<$data> scalar I<MUST NOT> be modified in any way while the request |
328 | is outstanding. Modifying it can result in segfaults or WW3 (if the |
358 | is outstanding. Modifying it can result in segfaults or World War III (if |
329 | necessary/optional hardware is installed). |
359 | the necessary/optional hardware is installed). |
330 | |
360 | |
331 | Example: Read 15 bytes at offset 7 into scalar C<$buffer>, starting at |
361 | Example: Read 15 bytes at offset 7 into scalar C<$buffer>, starting at |
332 | offset C<0> within the scalar: |
362 | offset C<0> within the scalar: |
333 | |
363 | |
334 | aio_read $fh, 7, 15, $buffer, 0, sub { |
364 | aio_read $fh, 7, 15, $buffer, 0, sub { |
335 | $_[0] > 0 or die "read error: $!"; |
365 | $_[0] > 0 or die "read error: $!"; |
336 | print "read $_[0] bytes: <$buffer>\n"; |
366 | print "read $_[0] bytes: <$buffer>\n"; |
337 | }; |
367 | }; |
|
|
368 | |
338 | |
369 | |
339 | =item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
370 | =item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
340 | |
371 | |
341 | Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts |
372 | Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts |
342 | reading at byte offset C<$in_offset>, and starts writing at the current |
373 | reading at byte offset C<$in_offset>, and starts writing at the current |
… | |
… | |
356 | C<$in_fh> than are written, and there is no way to find out how many |
387 | C<$in_fh> than are written, and there is no way to find out how many |
357 | bytes have been read from C<aio_sendfile> alone, as C<aio_sendfile> only |
388 | bytes have been read from C<aio_sendfile> alone, as C<aio_sendfile> only |
358 | provides the number of bytes written to C<$out_fh>. Only if the result |
389 | provides the number of bytes written to C<$out_fh>. Only if the result |
359 | value equals C<$length> one can assume that C<$length> bytes have been |
390 | value equals C<$length> one can assume that C<$length> bytes have been |
360 | read. |
391 | read. |
|
|
392 | |
361 | |
393 | |
362 | =item aio_readahead $fh,$offset,$length, $callback->($retval) |
394 | =item aio_readahead $fh,$offset,$length, $callback->($retval) |
363 | |
395 | |
364 | C<aio_readahead> populates the page cache with data from a file so that |
396 | C<aio_readahead> populates the page cache with data from a file so that |
365 | subsequent reads from that file will not block on disk I/O. The C<$offset> |
397 | subsequent reads from that file will not block on disk I/O. The C<$offset> |
… | |
… | |
371 | file. The current file offset of the file is left unchanged. |
403 | file. The current file offset of the file is left unchanged. |
372 | |
404 | |
373 | If that syscall doesn't exist (likely if your OS isn't Linux) it will be |
405 | If that syscall doesn't exist (likely if your OS isn't Linux) it will be |
374 | emulated by simply reading the data, which would have a similar effect. |
406 | emulated by simply reading the data, which would have a similar effect. |
375 | |
407 | |
|
|
408 | |
376 | =item aio_stat $fh_or_path, $callback->($status) |
409 | =item aio_stat $fh_or_path, $callback->($status) |
377 | |
410 | |
378 | =item aio_lstat $fh, $callback->($status) |
411 | =item aio_lstat $fh, $callback->($status) |
379 | |
412 | |
380 | Works like perl's C<stat> or C<lstat> in void context. The callback will |
413 | Works like perl's C<stat> or C<lstat> in void context. The callback will |
… | |
… | |
393 | aio_stat "/etc/passwd", sub { |
426 | aio_stat "/etc/passwd", sub { |
394 | $_[0] and die "stat failed: $!"; |
427 | $_[0] and die "stat failed: $!"; |
395 | print "size is ", -s _, "\n"; |
428 | print "size is ", -s _, "\n"; |
396 | }; |
429 | }; |
397 | |
430 | |
|
|
431 | |
|
|
432 | =item aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
|
|
433 | |
|
|
434 | Works like perl's C<utime> function (including the special case of $atime |
|
|
435 | and $mtime being undef). Fractional times are supported if the underlying |
|
|
436 | syscalls support them. |
|
|
437 | |
|
|
438 | When called with a pathname, uses utimes(2) if available, otherwise |
|
|
439 | utime(2). If called on a file descriptor, uses futimes(2) if available, |
|
|
440 | otherwise returns ENOSYS, so this is not portable. |
|
|
441 | |
|
|
442 | Examples: |
|
|
443 | |
|
|
444 | # set atime and mtime to current time (basically touch(1)): |
|
|
445 | aio_utime "path", undef, undef; |
|
|
446 | # set atime to current time and mtime to beginning of the epoch: |
|
|
447 | aio_utime "path", time, undef; # undef==0 |
|
|
448 | |
|
|
449 | |
|
|
450 | =item aio_chown $fh_or_path, $uid, $gid, $callback->($status) |
|
|
451 | |
|
|
452 | Works like perl's C<chown> function, except that C<undef> for either $uid |
|
|
453 | or $gid is being interpreted as "do not change" (but -1 can also be used). |
|
|
454 | |
|
|
455 | Examples: |
|
|
456 | |
|
|
457 | # same as "chown root path" in the shell: |
|
|
458 | aio_chown "path", 0, -1; |
|
|
459 | # same as above: |
|
|
460 | aio_chown "path", 0, undef; |
|
|
461 | |
|
|
462 | |
|
|
463 | =item aio_truncate $fh_or_path, $offset, $callback->($status) |
|
|
464 | |
|
|
465 | Works like truncate(2) or ftruncate(2). |
|
|
466 | |
|
|
467 | |
|
|
468 | =item aio_chmod $fh_or_path, $mode, $callback->($status) |
|
|
469 | |
|
|
470 | Works like perl's C<chmod> function. |
|
|
471 | |
|
|
472 | |
398 | =item aio_unlink $pathname, $callback->($status) |
473 | =item aio_unlink $pathname, $callback->($status) |
399 | |
474 | |
400 | Asynchronously unlink (delete) a file and call the callback with the |
475 | Asynchronously unlink (delete) a file and call the callback with the |
401 | result code. |
476 | result code. |
402 | |
477 | |
|
|
478 | |
403 | =item aio_mknod $path, $mode, $dev, $callback->($status) |
479 | =item aio_mknod $path, $mode, $dev, $callback->($status) |
404 | |
480 | |
405 | [EXPERIMENTAL] |
481 | [EXPERIMENTAL] |
406 | |
482 | |
407 | Asynchronously create a device node (or fifo). See mknod(2). |
483 | Asynchronously create a device node (or fifo). See mknod(2). |
408 | |
484 | |
409 | The only (POSIX-) portable way of calling this function is: |
485 | The only (POSIX-) portable way of calling this function is: |
410 | |
486 | |
411 | aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ... |
487 | aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ... |
|
|
488 | |
412 | |
489 | |
413 | =item aio_link $srcpath, $dstpath, $callback->($status) |
490 | =item aio_link $srcpath, $dstpath, $callback->($status) |
414 | |
491 | |
415 | Asynchronously create a new link to the existing object at C<$srcpath> at |
492 | Asynchronously create a new link to the existing object at C<$srcpath> at |
416 | the path C<$dstpath> and call the callback with the result code. |
493 | the path C<$dstpath> and call the callback with the result code. |
417 | |
494 | |
|
|
495 | |
418 | =item aio_symlink $srcpath, $dstpath, $callback->($status) |
496 | =item aio_symlink $srcpath, $dstpath, $callback->($status) |
419 | |
497 | |
420 | Asynchronously create a new symbolic link to the existing object at C<$srcpath> at |
498 | Asynchronously create a new symbolic link to the existing object at C<$srcpath> at |
421 | the path C<$dstpath> and call the callback with the result code. |
499 | the path C<$dstpath> and call the callback with the result code. |
|
|
500 | |
422 | |
501 | |
423 | =item aio_readlink $path, $callback->($link) |
502 | =item aio_readlink $path, $callback->($link) |
424 | |
503 | |
425 | Asynchronously read the symlink specified by C<$path> and pass it to |
504 | Asynchronously read the symlink specified by C<$path> and pass it to |
426 | the callback. If an error occurs, nothing or undef gets passed to the |
505 | the callback. If an error occurs, nothing or undef gets passed to the |
427 | callback. |
506 | callback. |
428 | |
507 | |
|
|
508 | |
429 | =item aio_rename $srcpath, $dstpath, $callback->($status) |
509 | =item aio_rename $srcpath, $dstpath, $callback->($status) |
430 | |
510 | |
431 | Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as |
511 | Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as |
432 | rename(2) and call the callback with the result code. |
512 | rename(2) and call the callback with the result code. |
433 | |
513 | |
|
|
514 | |
|
|
515 | =item aio_mkdir $pathname, $mode, $callback->($status) |
|
|
516 | |
|
|
517 | Asynchronously mkdir (create) a directory and call the callback with |
|
|
518 | the result code. C<$mode> will be modified by the umask at the time the |
|
|
519 | request is executed, so do not change your umask. |
|
|
520 | |
|
|
521 | |
434 | =item aio_rmdir $pathname, $callback->($status) |
522 | =item aio_rmdir $pathname, $callback->($status) |
435 | |
523 | |
436 | Asynchronously rmdir (delete) a directory and call the callback with the |
524 | Asynchronously rmdir (delete) a directory and call the callback with the |
437 | result code. |
525 | result code. |
|
|
526 | |
438 | |
527 | |
439 | =item aio_readdir $pathname, $callback->($entries) |
528 | =item aio_readdir $pathname, $callback->($entries) |
440 | |
529 | |
441 | Unlike the POSIX call of the same name, C<aio_readdir> reads an entire |
530 | Unlike the POSIX call of the same name, C<aio_readdir> reads an entire |
442 | directory (i.e. opendir + readdir + closedir). The entries will not be |
531 | directory (i.e. opendir + readdir + closedir). The entries will not be |
443 | sorted, and will B<NOT> include the C<.> and C<..> entries. |
532 | sorted, and will B<NOT> include the C<.> and C<..> entries. |
444 | |
533 | |
445 | The callback a single argument which is either C<undef> or an array-ref |
534 | The callback a single argument which is either C<undef> or an array-ref |
446 | with the filenames. |
535 | with the filenames. |
447 | |
536 | |
|
|
537 | |
|
|
538 | =item aio_load $path, $data, $callback->($status) |
|
|
539 | |
|
|
540 | This is a composite request that tries to fully load the given file into |
|
|
541 | memory. Status is the same as with aio_read. |
|
|
542 | |
|
|
543 | =cut |
|
|
544 | |
|
|
545 | sub aio_load($$;$) { |
|
|
546 | my ($path, undef, $cb) = @_; |
|
|
547 | my $data = \$_[1]; |
|
|
548 | |
|
|
549 | my $pri = aioreq_pri; |
|
|
550 | my $grp = aio_group $cb; |
|
|
551 | |
|
|
552 | aioreq_pri $pri; |
|
|
553 | add $grp aio_open $path, O_RDONLY, 0, sub { |
|
|
554 | my $fh = shift |
|
|
555 | or return $grp->result (-1); |
|
|
556 | |
|
|
557 | aioreq_pri $pri; |
|
|
558 | add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub { |
|
|
559 | $grp->result ($_[0]); |
|
|
560 | }; |
|
|
561 | }; |
|
|
562 | |
|
|
563 | $grp |
|
|
564 | } |
|
|
565 | |
448 | =item aio_copy $srcpath, $dstpath, $callback->($status) |
566 | =item aio_copy $srcpath, $dstpath, $callback->($status) |
449 | |
567 | |
450 | Try to copy the I<file> (directories not supported as either source or |
568 | Try to copy the I<file> (directories not supported as either source or |
451 | destination) from C<$srcpath> to C<$dstpath> and call the callback with |
569 | destination) from C<$srcpath> to C<$dstpath> and call the callback with |
452 | the C<0> (error) or C<-1> ok. |
570 | the C<0> (error) or C<-1> ok. |
453 | |
571 | |
454 | This is a composite request that it creates the destination file with |
572 | This is a composite request that creates the destination file with |
455 | mode 0200 and copies the contents of the source file into it using |
573 | mode 0200 and copies the contents of the source file into it using |
456 | C<aio_sendfile>, followed by restoring atime, mtime, access mode and |
574 | C<aio_sendfile>, followed by restoring atime, mtime, access mode and |
457 | uid/gid, in that order. |
575 | uid/gid, in that order. |
458 | |
576 | |
459 | If an error occurs, the partial destination file will be unlinked, if |
577 | If an error occurs, the partial destination file will be unlinked, if |
… | |
… | |
484 | |
602 | |
485 | # those should not normally block. should. should. |
603 | # those should not normally block. should. should. |
486 | utime $stat[8], $stat[9], $dst; |
604 | utime $stat[8], $stat[9], $dst; |
487 | chmod $stat[2] & 07777, $dst_fh; |
605 | chmod $stat[2] & 07777, $dst_fh; |
488 | chown $stat[4], $stat[5], $dst_fh; |
606 | chown $stat[4], $stat[5], $dst_fh; |
|
|
607 | |
|
|
608 | aioreq_pri $pri; |
489 | close $dst_fh; |
609 | add $grp aio_close $dst_fh; |
490 | } else { |
610 | } else { |
491 | $grp->result (-1); |
611 | $grp->result (-1); |
492 | close $src_fh; |
612 | close $src_fh; |
493 | close $dst_fh; |
613 | close $dst_fh; |
494 | |
614 | |
… | |
… | |
513 | |
633 | |
514 | Try to move the I<file> (directories not supported as either source or |
634 | Try to move the I<file> (directories not supported as either source or |
515 | destination) from C<$srcpath> to C<$dstpath> and call the callback with |
635 | destination) from C<$srcpath> to C<$dstpath> and call the callback with |
516 | the C<0> (error) or C<-1> ok. |
636 | the C<0> (error) or C<-1> ok. |
517 | |
637 | |
518 | This is a composite request that tries to rename(2) the file first. If |
638 | This is a composite request that tries to rename(2) the file first; if |
519 | rename files with C<EXDEV>, it copies the file with C<aio_copy> and, if |
639 | rename fails with C<EXDEV>, it copies the file with C<aio_copy> and, if |
520 | that is successful, unlinking the C<$srcpath>. |
640 | that is successful, unlinks the C<$srcpath>. |
521 | |
641 | |
522 | =cut |
642 | =cut |
523 | |
643 | |
524 | sub aio_move($$;$) { |
644 | sub aio_move($$;$) { |
525 | my ($src, $dst, $cb) = @_; |
645 | my ($src, $dst, $cb) = @_; |
… | |
… | |
599 | as those tend to return 0 or 1 as link counts, which disables the |
719 | as those tend to return 0 or 1 as link counts, which disables the |
600 | directory counting heuristic. |
720 | directory counting heuristic. |
601 | |
721 | |
602 | =cut |
722 | =cut |
603 | |
723 | |
604 | sub aio_scandir($$$) { |
724 | sub aio_scandir($$;$) { |
605 | my ($path, $maxreq, $cb) = @_; |
725 | my ($path, $maxreq, $cb) = @_; |
606 | |
726 | |
607 | my $pri = aioreq_pri; |
727 | my $pri = aioreq_pri; |
608 | |
728 | |
609 | my $grp = aio_group $cb; |
729 | my $grp = aio_group $cb; |
… | |
… | |
685 | }; |
805 | }; |
686 | |
806 | |
687 | $grp |
807 | $grp |
688 | } |
808 | } |
689 | |
809 | |
|
|
810 | =item aio_rmtree $path, $callback->($status) |
|
|
811 | |
|
|
812 | Delete a directory tree starting (and including) C<$path>, return the |
|
|
813 | status of the final C<rmdir> only. This is a composite request that |
|
|
814 | uses C<aio_scandir> to recurse into and rmdir directories, and unlink |
|
|
815 | everything else. |
|
|
816 | |
|
|
817 | =cut |
|
|
818 | |
|
|
819 | sub aio_rmtree; |
|
|
820 | sub aio_rmtree($;$) { |
|
|
821 | my ($path, $cb) = @_; |
|
|
822 | |
|
|
823 | my $pri = aioreq_pri; |
|
|
824 | my $grp = aio_group $cb; |
|
|
825 | |
|
|
826 | aioreq_pri $pri; |
|
|
827 | add $grp aio_scandir $path, 0, sub { |
|
|
828 | my ($dirs, $nondirs) = @_; |
|
|
829 | |
|
|
830 | my $dirgrp = aio_group sub { |
|
|
831 | add $grp aio_rmdir $path, sub { |
|
|
832 | $grp->result ($_[0]); |
|
|
833 | }; |
|
|
834 | }; |
|
|
835 | |
|
|
836 | (aioreq_pri $pri), add $dirgrp aio_rmtree "$path/$_" for @$dirs; |
|
|
837 | (aioreq_pri $pri), add $dirgrp aio_unlink "$path/$_" for @$nondirs; |
|
|
838 | |
|
|
839 | add $grp $dirgrp; |
|
|
840 | }; |
|
|
841 | |
|
|
842 | $grp |
|
|
843 | } |
|
|
844 | |
|
|
845 | =item aio_sync $callback->($status) |
|
|
846 | |
|
|
847 | Asynchronously call sync and call the callback when finished. |
|
|
848 | |
690 | =item aio_fsync $fh, $callback->($status) |
849 | =item aio_fsync $fh, $callback->($status) |
691 | |
850 | |
692 | Asynchronously call fsync on the given filehandle and call the callback |
851 | Asynchronously call fsync on the given filehandle and call the callback |
693 | with the fsync result code. |
852 | with the fsync result code. |
694 | |
853 | |
… | |
… | |
697 | Asynchronously call fdatasync on the given filehandle and call the |
856 | Asynchronously call fdatasync on the given filehandle and call the |
698 | callback with the fdatasync result code. |
857 | callback with the fdatasync result code. |
699 | |
858 | |
700 | If this call isn't available because your OS lacks it or it couldn't be |
859 | If this call isn't available because your OS lacks it or it couldn't be |
701 | detected, it will be emulated by calling C<fsync> instead. |
860 | detected, it will be emulated by calling C<fsync> instead. |
|
|
861 | |
|
|
862 | =item aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
|
|
863 | |
|
|
864 | Sync the data portion of the file specified by C<$offset> and C<$length> |
|
|
865 | to disk (but NOT the metadata), by calling the Linux-specific |
|
|
866 | sync_file_range call. If sync_file_range is not available or it returns |
|
|
867 | ENOSYS, then fdatasync or fsync is being substituted. |
|
|
868 | |
|
|
869 | C<$flags> can be a combination of C<IO::AIO::SYNC_FILE_RANGE_WAIT_BEFORE>, |
|
|
870 | C<IO::AIO::SYNC_FILE_RANGE_WRITE> and |
|
|
871 | C<IO::AIO::SYNC_FILE_RANGE_WAIT_AFTER>: refer to the sync_file_range |
|
|
872 | manpage for details. |
|
|
873 | |
|
|
874 | =item aio_pathsync $path, $callback->($status) |
|
|
875 | |
|
|
876 | This request tries to open, fsync and close the given path. This is a |
|
|
877 | composite request intended to sync directories after directory operations |
|
|
878 | (E.g. rename). This might not work on all operating systems or have any |
|
|
879 | specific effect, but usually it makes sure that directory changes get |
|
|
880 | written to disc. It works for anything that can be opened for read-only, |
|
|
881 | not just directories. |
|
|
882 | |
|
|
883 | Passes C<0> when everything went ok, and C<-1> on error. |
|
|
884 | |
|
|
885 | =cut |
|
|
886 | |
|
|
887 | sub aio_pathsync($;$) { |
|
|
888 | my ($path, $cb) = @_; |
|
|
889 | |
|
|
890 | my $pri = aioreq_pri; |
|
|
891 | my $grp = aio_group $cb; |
|
|
892 | |
|
|
893 | aioreq_pri $pri; |
|
|
894 | add $grp aio_open $path, O_RDONLY, 0, sub { |
|
|
895 | my ($fh) = @_; |
|
|
896 | if ($fh) { |
|
|
897 | aioreq_pri $pri; |
|
|
898 | add $grp aio_fsync $fh, sub { |
|
|
899 | $grp->result ($_[0]); |
|
|
900 | |
|
|
901 | aioreq_pri $pri; |
|
|
902 | add $grp aio_close $fh; |
|
|
903 | }; |
|
|
904 | } else { |
|
|
905 | $grp->result (-1); |
|
|
906 | } |
|
|
907 | }; |
|
|
908 | |
|
|
909 | $grp |
|
|
910 | } |
702 | |
911 | |
703 | =item aio_group $callback->(...) |
912 | =item aio_group $callback->(...) |
704 | |
913 | |
705 | This is a very special aio request: Instead of doing something, it is a |
914 | This is a very special aio request: Instead of doing something, it is a |
706 | container for other aio requests, which is useful if you want to bundle |
915 | container for other aio requests, which is useful if you want to bundle |
… | |
… | |
818 | Their lifetime, simplified, looks like this: when they are empty, they |
1027 | Their lifetime, simplified, looks like this: when they are empty, they |
819 | will finish very quickly. If they contain only requests that are in the |
1028 | will finish very quickly. If they contain only requests that are in the |
820 | C<done> state, they will also finish. Otherwise they will continue to |
1029 | C<done> state, they will also finish. Otherwise they will continue to |
821 | exist. |
1030 | exist. |
822 | |
1031 | |
823 | That means after creating a group you have some time to add requests. And |
1032 | That means after creating a group you have some time to add requests |
824 | in the callbacks of those requests, you can add further requests to the |
1033 | (precisely before the callback has been invoked, which is only done within |
825 | group. And only when all those requests have finished will the the group |
1034 | the C<poll_cb>). And in the callbacks of those requests, you can add |
826 | itself finish. |
1035 | further requests to the group. And only when all those requests have |
|
|
1036 | finished will the the group itself finish. |
827 | |
1037 | |
828 | =over 4 |
1038 | =over 4 |
829 | |
1039 | |
830 | =item add $grp ... |
1040 | =item add $grp ... |
831 | |
1041 | |
… | |
… | |
843 | itself. Useful when you queued a lot of events but got a result early. |
1053 | itself. Useful when you queued a lot of events but got a result early. |
844 | |
1054 | |
845 | =item $grp->result (...) |
1055 | =item $grp->result (...) |
846 | |
1056 | |
847 | Set the result value(s) that will be passed to the group callback when all |
1057 | Set the result value(s) that will be passed to the group callback when all |
848 | subrequests have finished and set thre groups errno to the current value |
1058 | subrequests have finished and set the groups errno to the current value |
849 | of errno (just like calling C<errno> without an error number). By default, |
1059 | of errno (just like calling C<errno> without an error number). By default, |
850 | no argument will be passed and errno is zero. |
1060 | no argument will be passed and errno is zero. |
851 | |
1061 | |
852 | =item $grp->errno ([$errno]) |
1062 | =item $grp->errno ([$errno]) |
853 | |
1063 | |
… | |
… | |
864 | =item feed $grp $callback->($grp) |
1074 | =item feed $grp $callback->($grp) |
865 | |
1075 | |
866 | Sets a feeder/generator on this group: every group can have an attached |
1076 | Sets a feeder/generator on this group: every group can have an attached |
867 | generator that generates requests if idle. The idea behind this is that, |
1077 | generator that generates requests if idle. The idea behind this is that, |
868 | although you could just queue as many requests as you want in a group, |
1078 | although you could just queue as many requests as you want in a group, |
869 | this might starve other requests for a potentially long time. For |
1079 | this might starve other requests for a potentially long time. For example, |
870 | example, C<aio_scandir> might generate hundreds of thousands C<aio_stat> |
1080 | C<aio_scandir> might generate hundreds of thousands C<aio_stat> requests, |
871 | requests, delaying any later requests for a long time. |
1081 | delaying any later requests for a long time. |
872 | |
1082 | |
873 | To avoid this, and allow incremental generation of requests, you can |
1083 | To avoid this, and allow incremental generation of requests, you can |
874 | instead a group and set a feeder on it that generates those requests. The |
1084 | instead a group and set a feeder on it that generates those requests. The |
875 | feed callback will be called whenever there are few enough (see C<limit>, |
1085 | feed callback will be called whenever there are few enough (see C<limit>, |
876 | below) requests active in the group itself and is expected to queue more |
1086 | below) requests active in the group itself and is expected to queue more |
… | |
… | |
880 | not impose any limits). |
1090 | not impose any limits). |
881 | |
1091 | |
882 | If the feed does not queue more requests when called, it will be |
1092 | If the feed does not queue more requests when called, it will be |
883 | automatically removed from the group. |
1093 | automatically removed from the group. |
884 | |
1094 | |
885 | If the feed limit is C<0>, it will be set to C<2> automatically. |
1095 | If the feed limit is C<0> when this method is called, it will be set to |
|
|
1096 | C<2> automatically. |
886 | |
1097 | |
887 | Example: |
1098 | Example: |
888 | |
1099 | |
889 | # stat all files in @files, but only ever use four aio requests concurrently: |
1100 | # stat all files in @files, but only ever use four aio requests concurrently: |
890 | |
1101 | |
… | |
… | |
902 | Sets the feeder limit for the group: The feeder will be called whenever |
1113 | Sets the feeder limit for the group: The feeder will be called whenever |
903 | the group contains less than this many requests. |
1114 | the group contains less than this many requests. |
904 | |
1115 | |
905 | Setting the limit to C<0> will pause the feeding process. |
1116 | Setting the limit to C<0> will pause the feeding process. |
906 | |
1117 | |
|
|
1118 | The default value for the limit is C<0>, but note that setting a feeder |
|
|
1119 | automatically bumps it up to C<2>. |
|
|
1120 | |
907 | =back |
1121 | =back |
908 | |
1122 | |
909 | =head2 SUPPORT FUNCTIONS |
1123 | =head2 SUPPORT FUNCTIONS |
910 | |
1124 | |
911 | =head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION |
1125 | =head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION |
… | |
… | |
922 | See C<poll_cb> for an example. |
1136 | See C<poll_cb> for an example. |
923 | |
1137 | |
924 | =item IO::AIO::poll_cb |
1138 | =item IO::AIO::poll_cb |
925 | |
1139 | |
926 | Process some outstanding events on the result pipe. You have to call this |
1140 | Process some outstanding events on the result pipe. You have to call this |
927 | regularly. Returns the number of events processed. Returns immediately |
1141 | regularly. Returns C<0> if all events could be processed, or C<-1> if it |
|
|
1142 | returned earlier for whatever reason. Returns immediately when no events |
928 | when no events are outstanding. The amount of events processed depends on |
1143 | are outstanding. The amount of events processed depends on the settings of |
929 | the settings of C<IO::AIO::max_poll_req> and C<IO::AIO::max_poll_time>. |
1144 | C<IO::AIO::max_poll_req> and C<IO::AIO::max_poll_time>. |
930 | |
1145 | |
931 | If not all requests were processed for whatever reason, the filehandle |
1146 | If not all requests were processed for whatever reason, the filehandle |
932 | will still be ready when C<poll_cb> returns. |
1147 | will still be ready when C<poll_cb> returns, so normally you don't have to |
|
|
1148 | do anything special to have it called later. |
933 | |
1149 | |
934 | Example: Install an Event watcher that automatically calls |
1150 | Example: Install an Event watcher that automatically calls |
935 | IO::AIO::poll_cb with high priority: |
1151 | IO::AIO::poll_cb with high priority: |
936 | |
1152 | |
937 | Event->io (fd => IO::AIO::poll_fileno, |
1153 | Event->io (fd => IO::AIO::poll_fileno, |
… | |
… | |
996 | Strictly equivalent to: |
1212 | Strictly equivalent to: |
997 | |
1213 | |
998 | IO::AIO::poll_wait, IO::AIO::poll_cb |
1214 | IO::AIO::poll_wait, IO::AIO::poll_cb |
999 | while IO::AIO::nreqs; |
1215 | while IO::AIO::nreqs; |
1000 | |
1216 | |
|
|
1217 | =back |
|
|
1218 | |
1001 | =head3 CONTROLLING THE NUMBER OF THREADS |
1219 | =head3 CONTROLLING THE NUMBER OF THREADS |
|
|
1220 | |
|
|
1221 | =over |
1002 | |
1222 | |
1003 | =item IO::AIO::min_parallel $nthreads |
1223 | =item IO::AIO::min_parallel $nthreads |
1004 | |
1224 | |
1005 | Set the minimum number of AIO threads to C<$nthreads>. The current |
1225 | Set the minimum number of AIO threads to C<$nthreads>. The current |
1006 | default is C<8>, which means eight asynchronous operations can execute |
1226 | default is C<8>, which means eight asynchronous operations can execute |
… | |
… | |
1047 | |
1267 | |
1048 | The default is probably ok in most situations, especially if thread |
1268 | The default is probably ok in most situations, especially if thread |
1049 | creation is fast. If thread creation is very slow on your system you might |
1269 | creation is fast. If thread creation is very slow on your system you might |
1050 | want to use larger values. |
1270 | want to use larger values. |
1051 | |
1271 | |
1052 | =item $oldmaxreqs = IO::AIO::max_outstanding $maxreqs |
1272 | =item IO::AIO::max_outstanding $maxreqs |
1053 | |
1273 | |
1054 | This is a very bad function to use in interactive programs because it |
1274 | This is a very bad function to use in interactive programs because it |
1055 | blocks, and a bad way to reduce concurrency because it is inexact: Better |
1275 | blocks, and a bad way to reduce concurrency because it is inexact: Better |
1056 | use an C<aio_group> together with a feed callback. |
1276 | use an C<aio_group> together with a feed callback. |
1057 | |
1277 | |
1058 | Sets the maximum number of outstanding requests to C<$nreqs>. If you |
1278 | Sets the maximum number of outstanding requests to C<$nreqs>. If you |
1059 | to queue up more than this number of requests, the next call to the |
1279 | do queue up more than this number of requests, the next call to the |
1060 | C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>) |
1280 | C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>) |
1061 | function will block until the limit is no longer exceeded. |
1281 | function will block until the limit is no longer exceeded. |
1062 | |
1282 | |
1063 | The default value is very large, so there is no practical limit on the |
1283 | The default value is very large, so there is no practical limit on the |
1064 | number of outstanding requests. |
1284 | number of outstanding requests. |
1065 | |
1285 | |
1066 | You can still queue as many requests as you want. Therefore, |
1286 | You can still queue as many requests as you want. Therefore, |
1067 | C<max_oustsanding> is mainly useful in simple scripts (with low values) or |
1287 | C<max_outstanding> is mainly useful in simple scripts (with low values) or |
1068 | as a stop gap to shield against fatal memory overflow (with large values). |
1288 | as a stop gap to shield against fatal memory overflow (with large values). |
1069 | |
1289 | |
|
|
1290 | =back |
|
|
1291 | |
1070 | =head3 STATISTICAL INFORMATION |
1292 | =head3 STATISTICAL INFORMATION |
|
|
1293 | |
|
|
1294 | =over |
1071 | |
1295 | |
1072 | =item IO::AIO::nreqs |
1296 | =item IO::AIO::nreqs |
1073 | |
1297 | |
1074 | Returns the number of requests currently in the ready, execute or pending |
1298 | Returns the number of requests currently in the ready, execute or pending |
1075 | states (i.e. for which their callback has not been invoked yet). |
1299 | states (i.e. for which their callback has not been invoked yet). |
… | |
… | |
1091 | |
1315 | |
1092 | =back |
1316 | =back |
1093 | |
1317 | |
1094 | =cut |
1318 | =cut |
1095 | |
1319 | |
1096 | # support function to convert a fd into a perl filehandle |
|
|
1097 | sub _fd2fh { |
|
|
1098 | return undef if $_[0] < 0; |
|
|
1099 | |
|
|
1100 | # try to generate nice filehandles |
|
|
1101 | my $sym = "IO::AIO::fd#$_[0]"; |
|
|
1102 | local *$sym; |
|
|
1103 | |
|
|
1104 | open *$sym, "+<&=$_[0]" # usually works under any unix |
|
|
1105 | or open *$sym, "<&=$_[0]" # cygwin needs this |
|
|
1106 | or open *$sym, ">&=$_[0]" # or this |
|
|
1107 | or return undef; |
|
|
1108 | |
|
|
1109 | *$sym |
|
|
1110 | } |
|
|
1111 | |
|
|
1112 | min_parallel 8; |
1320 | min_parallel 8; |
1113 | |
1321 | |
1114 | END { |
1322 | END { flush } |
1115 | min_parallel 1; |
|
|
1116 | flush; |
|
|
1117 | }; |
|
|
1118 | |
1323 | |
1119 | 1; |
1324 | 1; |
1120 | |
1325 | |
1121 | =head2 FORK BEHAVIOUR |
1326 | =head2 FORK BEHAVIOUR |
1122 | |
1327 | |
… | |
… | |
1142 | bytes of memory. In addition, stat requests need a stat buffer (possibly |
1347 | bytes of memory. In addition, stat requests need a stat buffer (possibly |
1143 | a few hundred bytes), readdir requires a result buffer and so on. Perl |
1348 | a few hundred bytes), readdir requires a result buffer and so on. Perl |
1144 | scalars and other data passed into aio requests will also be locked and |
1349 | scalars and other data passed into aio requests will also be locked and |
1145 | will consume memory till the request has entered the done state. |
1350 | will consume memory till the request has entered the done state. |
1146 | |
1351 | |
1147 | This is now awfully much, so queuing lots of requests is not usually a |
1352 | This is not awfully much, so queuing lots of requests is not usually a |
1148 | problem. |
1353 | problem. |
1149 | |
1354 | |
1150 | Per-thread usage: |
1355 | Per-thread usage: |
1151 | |
1356 | |
1152 | In the execution phase, some aio requests require more memory for |
1357 | In the execution phase, some aio requests require more memory for |
… | |
… | |
1157 | |
1362 | |
1158 | Known bugs will be fixed in the next release. |
1363 | Known bugs will be fixed in the next release. |
1159 | |
1364 | |
1160 | =head1 SEE ALSO |
1365 | =head1 SEE ALSO |
1161 | |
1366 | |
1162 | L<Coro::AIO>. |
1367 | L<AnyEvent::AIO> for easy integration into event loops, L<Coro::AIO> for a |
|
|
1368 | more natural syntax. |
1163 | |
1369 | |
1164 | =head1 AUTHOR |
1370 | =head1 AUTHOR |
1165 | |
1371 | |
1166 | Marc Lehmann <schmorp@schmorp.de> |
1372 | Marc Lehmann <schmorp@schmorp.de> |
1167 | http://home.schmorp.de/ |
1373 | http://home.schmorp.de/ |