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3 | |
3 | |
4 | SYNOPSIS |
4 | SYNOPSIS |
5 | use IO::AIO; |
5 | use IO::AIO; |
6 | |
6 | |
7 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
7 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
8 | my ($fh) = @_; |
8 | my $fh = shift |
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9 | or die "/etc/passwd: $!"; |
9 | ... |
10 | ... |
10 | }; |
11 | }; |
11 | |
12 | |
12 | aio_unlink "/tmp/file", sub { }; |
13 | aio_unlink "/tmp/file", sub { }; |
13 | |
14 | |
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60 | faster on a RAID volume or over NFS when you do a number of stat |
61 | faster on a RAID volume or over NFS when you do a number of stat |
61 | operations concurrently. |
62 | operations concurrently. |
62 | |
63 | |
63 | While most of this works on all types of file descriptors (for example |
64 | While most of this works on all types of file descriptors (for example |
64 | sockets), using these functions on file descriptors that support |
65 | sockets), using these functions on file descriptors that support |
65 | nonblocking operation (again, sockets, pipes etc.) is very inefficient |
66 | nonblocking operation (again, sockets, pipes etc.) is very inefficient. |
66 | or might not work (aio_read fails on sockets/pipes/fifos). Use an event |
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67 | loop for that (such as the Event module): IO::AIO will naturally fit |
67 | Use an event loop for that (such as the Event module): IO::AIO will |
68 | into such an event loop itself. |
68 | naturally fit into such an event loop itself. |
69 | |
69 | |
70 | In this version, a number of threads are started that execute your |
70 | In this version, a number of threads are started that execute your |
71 | requests and signal their completion. You don't need thread support in |
71 | requests and signal their completion. You don't need thread support in |
72 | perl, and the threads created by this module will not be visible to |
72 | perl, and the threads created by this module will not be visible to |
73 | perl. In the future, this module might make use of the native aio |
73 | perl. In the future, this module might make use of the native aio |
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75 | not well-supported or restricted (GNU/Linux doesn't allow them on normal |
75 | not well-supported or restricted (GNU/Linux doesn't allow them on normal |
76 | files currently, for example), and they would only support aio_read and |
76 | files currently, for example), and they would only support aio_read and |
77 | aio_write, so the remaining functionality would have to be implemented |
77 | aio_write, so the remaining functionality would have to be implemented |
78 | using threads anyway. |
78 | using threads anyway. |
79 | |
79 | |
80 | Although the module will work with in the presence of other (Perl-) |
80 | Although the module will work in the presence of other (Perl-) threads, |
81 | threads, it is currently not reentrant in any way, so use appropriate |
81 | it is currently not reentrant in any way, so use appropriate locking |
82 | locking yourself, always call "poll_cb" from within the same thread, or |
82 | yourself, always call "poll_cb" from within the same thread, or never |
83 | never call "poll_cb" (or other "aio_" functions) recursively. |
83 | call "poll_cb" (or other "aio_" functions) recursively. |
84 | |
84 | |
85 | EXAMPLE |
85 | EXAMPLE |
86 | This is a simple example that uses the Event module and loads |
86 | This is a simple example that uses the Event module and loads |
87 | /etc/passwd asynchronously: |
87 | /etc/passwd asynchronously: |
88 | |
88 | |
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95 | poll => 'r', |
95 | poll => 'r', |
96 | cb => \&IO::AIO::poll_cb); |
96 | cb => \&IO::AIO::poll_cb); |
97 | |
97 | |
98 | # queue the request to open /etc/passwd |
98 | # queue the request to open /etc/passwd |
99 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
99 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
100 | my $fh = $_[0] |
100 | my $fh = shift |
101 | or die "error while opening: $!"; |
101 | or die "error while opening: $!"; |
102 | |
102 | |
103 | # stat'ing filehandles is generally non-blocking |
103 | # stat'ing filehandles is generally non-blocking |
104 | my $size = -s $fh; |
104 | my $size = -s $fh; |
105 | |
105 | |
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241 | They are the same as used by "sysopen". |
241 | They are the same as used by "sysopen". |
242 | |
242 | |
243 | Likewise, $mode specifies the mode of the newly created file, if it |
243 | Likewise, $mode specifies the mode of the newly created file, if it |
244 | didn't exist and "O_CREAT" has been given, just like perl's |
244 | didn't exist and "O_CREAT" has been given, just like perl's |
245 | "sysopen", except that it is mandatory (i.e. use 0 if you don't |
245 | "sysopen", except that it is mandatory (i.e. use 0 if you don't |
246 | create new files, and 0666 or 0777 if you do). |
246 | create new files, and 0666 or 0777 if you do). Note that the $mode |
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247 | will be modified by the umask in effect then the request is being |
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248 | executed, so better never change the umask. |
247 | |
249 | |
248 | Example: |
250 | Example: |
249 | |
251 | |
250 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
252 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
251 | if ($_[0]) { |
253 | if ($_[0]) { |
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266 | This is supposed to be a bug in the API, so that might change. It's |
268 | This is supposed to be a bug in the API, so that might change. It's |
267 | therefore best to avoid this function. |
269 | therefore best to avoid this function. |
268 | |
270 | |
269 | aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
271 | aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
270 | aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
272 | aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
271 | Reads or writes "length" bytes from the specified "fh" and "offset" |
273 | Reads or writes $length bytes from the specified $fh and $offset |
272 | into the scalar given by "data" and offset "dataoffset" and calls |
274 | into the scalar given by $data and offset $dataoffset and calls the |
273 | the callback without the actual number of bytes read (or -1 on |
275 | callback without the actual number of bytes read (or -1 on error, |
274 | error, just like the syscall). |
276 | just like the syscall). |
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277 | |
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278 | If $offset is undefined, then the current file offset will be used |
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279 | (and updated), otherwise the file offset will not be changed by |
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280 | these calls. |
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281 | |
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282 | If $length is undefined in "aio_write", use the remaining length of |
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283 | $data. |
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284 | |
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285 | If $dataoffset is less than zero, it will be counted from the end of |
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286 | $data. |
275 | |
287 | |
276 | The $data scalar *MUST NOT* be modified in any way while the request |
288 | The $data scalar *MUST NOT* be modified in any way while the request |
277 | is outstanding. Modifying it can result in segfaults or WW3 (if the |
289 | is outstanding. Modifying it can result in segfaults or World War |
278 | necessary/optional hardware is installed). |
290 | III (if the necessary/optional hardware is installed). |
279 | |
291 | |
280 | Example: Read 15 bytes at offset 7 into scalar $buffer, starting at |
292 | Example: Read 15 bytes at offset 7 into scalar $buffer, starting at |
281 | offset 0 within the scalar: |
293 | offset 0 within the scalar: |
282 | |
294 | |
283 | aio_read $fh, 7, 15, $buffer, 0, sub { |
295 | aio_read $fh, 7, 15, $buffer, 0, sub { |
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341 | aio_stat "/etc/passwd", sub { |
353 | aio_stat "/etc/passwd", sub { |
342 | $_[0] and die "stat failed: $!"; |
354 | $_[0] and die "stat failed: $!"; |
343 | print "size is ", -s _, "\n"; |
355 | print "size is ", -s _, "\n"; |
344 | }; |
356 | }; |
345 | |
357 | |
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358 | aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
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359 | Works like perl's "utime" function (including the special case of |
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360 | $atime and $mtime being undef). Fractional times are supported if |
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361 | the underlying syscalls support them. |
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362 | |
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363 | When called with a pathname, uses utimes(2) if available, otherwise |
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364 | utime(2). If called on a file descriptor, uses futimes(2) if |
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365 | available, otherwise returns ENOSYS, so this is not portable. |
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366 | |
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367 | Examples: |
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368 | |
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369 | # set atime and mtime to current time (basically touch(1)): |
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370 | aio_utime "path", undef, undef; |
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371 | # set atime to current time and mtime to beginning of the epoch: |
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372 | aio_utime "path", time, undef; # undef==0 |
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373 | |
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374 | aio_chown $fh_or_path, $uid, $gid, $callback->($status) |
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375 | Works like perl's "chown" function, except that "undef" for either |
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376 | $uid or $gid is being interpreted as "do not change" (but -1 can |
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377 | also be used). |
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378 | |
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379 | Examples: |
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380 | |
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381 | # same as "chown root path" in the shell: |
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382 | aio_chown "path", 0, -1; |
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383 | # same as above: |
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384 | aio_chown "path", 0, undef; |
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385 | |
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386 | aio_truncate $fh_or_path, $offset, $callback->($status) |
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387 | Works like truncate(2) or ftruncate(2). |
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388 | |
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389 | aio_chmod $fh_or_path, $mode, $callback->($status) |
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390 | Works like perl's "chmod" function. |
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391 | |
346 | aio_unlink $pathname, $callback->($status) |
392 | aio_unlink $pathname, $callback->($status) |
347 | Asynchronously unlink (delete) a file and call the callback with the |
393 | Asynchronously unlink (delete) a file and call the callback with the |
348 | result code. |
394 | result code. |
349 | |
395 | |
350 | aio_mknod $path, $mode, $dev, $callback->($status) |
396 | aio_mknod $path, $mode, $dev, $callback->($status) |
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372 | |
418 | |
373 | aio_rename $srcpath, $dstpath, $callback->($status) |
419 | aio_rename $srcpath, $dstpath, $callback->($status) |
374 | Asynchronously rename the object at $srcpath to $dstpath, just as |
420 | Asynchronously rename the object at $srcpath to $dstpath, just as |
375 | rename(2) and call the callback with the result code. |
421 | rename(2) and call the callback with the result code. |
376 | |
422 | |
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423 | aio_mkdir $pathname, $mode, $callback->($status) |
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424 | Asynchronously mkdir (create) a directory and call the callback with |
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425 | the result code. $mode will be modified by the umask at the time the |
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426 | request is executed, so do not change your umask. |
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427 | |
377 | aio_rmdir $pathname, $callback->($status) |
428 | aio_rmdir $pathname, $callback->($status) |
378 | Asynchronously rmdir (delete) a directory and call the callback with |
429 | Asynchronously rmdir (delete) a directory and call the callback with |
379 | the result code. |
430 | the result code. |
380 | |
431 | |
381 | aio_readdir $pathname, $callback->($entries) |
432 | aio_readdir $pathname, $callback->($entries) |
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383 | entire directory (i.e. opendir + readdir + closedir). The entries |
434 | entire directory (i.e. opendir + readdir + closedir). The entries |
384 | will not be sorted, and will NOT include the "." and ".." entries. |
435 | will not be sorted, and will NOT include the "." and ".." entries. |
385 | |
436 | |
386 | The callback a single argument which is either "undef" or an |
437 | The callback a single argument which is either "undef" or an |
387 | array-ref with the filenames. |
438 | array-ref with the filenames. |
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439 | |
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440 | aio_load $path, $data, $callback->($status) |
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441 | This is a composite request that tries to fully load the given file |
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442 | into memory. Status is the same as with aio_read. |
388 | |
443 | |
389 | aio_copy $srcpath, $dstpath, $callback->($status) |
444 | aio_copy $srcpath, $dstpath, $callback->($status) |
390 | Try to copy the *file* (directories not supported as either source |
445 | Try to copy the *file* (directories not supported as either source |
391 | or destination) from $srcpath to $dstpath and call the callback with |
446 | or destination) from $srcpath to $dstpath and call the callback with |
392 | the 0 (error) or -1 ok. |
447 | the 0 (error) or -1 ok. |
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460 | |
515 | |
461 | It will also likely work on non-POSIX filesystems with reduced |
516 | It will also likely work on non-POSIX filesystems with reduced |
462 | efficiency as those tend to return 0 or 1 as link counts, which |
517 | efficiency as those tend to return 0 or 1 as link counts, which |
463 | disables the directory counting heuristic. |
518 | disables the directory counting heuristic. |
464 | |
519 | |
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520 | aio_rmtree $path, $callback->($status) |
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521 | Delete a directory tree starting (and including) $path, return the |
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522 | status of the final "rmdir" only. This is a composite request that |
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523 | uses "aio_scandir" to recurse into and rmdir directories, and unlink |
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524 | everything else. |
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525 | |
465 | aio_fsync $fh, $callback->($status) |
526 | aio_fsync $fh, $callback->($status) |
466 | Asynchronously call fsync on the given filehandle and call the |
527 | Asynchronously call fsync on the given filehandle and call the |
467 | callback with the fsync result code. |
528 | callback with the fsync result code. |
468 | |
529 | |
469 | aio_fdatasync $fh, $callback->($status) |
530 | aio_fdatasync $fh, $callback->($status) |
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711 | Event->io (fd => IO::AIO::poll_fileno, |
772 | Event->io (fd => IO::AIO::poll_fileno, |
712 | poll => 'r', nice => 1, |
773 | poll => 'r', nice => 1, |
713 | cb => &IO::AIO::poll_cb); |
774 | cb => &IO::AIO::poll_cb); |
714 | |
775 | |
715 | IO::AIO::poll_wait |
776 | IO::AIO::poll_wait |
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777 | If there are any outstanding requests and none of them in the result |
716 | Wait till the result filehandle becomes ready for reading (simply |
778 | phase, wait till the result filehandle becomes ready for reading |
717 | does a "select" on the filehandle. This is useful if you want to |
779 | (simply does a "select" on the filehandle. This is useful if you |
718 | synchronously wait for some requests to finish). |
780 | want to synchronously wait for some requests to finish). |
719 | |
781 | |
720 | See "nreqs" for an example. |
782 | See "nreqs" for an example. |
721 | |
783 | |
722 | IO::AIO::poll |
784 | IO::AIO::poll |
723 | Waits until some requests have been handled. |
785 | Waits until some requests have been handled. |
724 | |
786 | |
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787 | Returns the number of requests processed, but is otherwise strictly |
725 | Strictly equivalent to: |
788 | equivalent to: |
726 | |
789 | |
727 | IO::AIO::poll_wait, IO::AIO::poll_cb |
790 | IO::AIO::poll_wait, IO::AIO::poll_cb |
728 | if IO::AIO::nreqs; |
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729 | |
791 | |
730 | IO::AIO::flush |
792 | IO::AIO::flush |
731 | Wait till all outstanding AIO requests have been handled. |
793 | Wait till all outstanding AIO requests have been handled. |
732 | |
794 | |
733 | Strictly equivalent to: |
795 | Strictly equivalent to: |