| … | |
… | |
| 63 | use base 'Exporter'; |
63 | use base 'Exporter'; |
| 64 | |
64 | |
| 65 | use Fcntl (); |
65 | use Fcntl (); |
| 66 | |
66 | |
| 67 | BEGIN { |
67 | BEGIN { |
| 68 | $VERSION = 1.2; |
68 | $VERSION = 1.3; |
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69 | |
| 69 | |
70 | |
| 70 | @EXPORT = qw(aio_read aio_write aio_open aio_close aio_stat aio_lstat aio_unlink |
71 | @EXPORT = qw(aio_read aio_write aio_open aio_close aio_stat aio_lstat aio_unlink |
| 71 | aio_rmdir aio_symlink aio_fsync aio_fdatasync aio_readahead); |
72 | aio_rmdir aio_symlink aio_fsync aio_fdatasync aio_readahead); |
| 72 | @EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel max_outstanding nreqs); |
73 | @EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel max_outstanding nreqs); |
| 73 | |
74 | |
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| 150 | Reads or writes C<length> bytes from the specified C<fh> and C<offset> |
151 | Reads or writes C<length> bytes from the specified C<fh> and C<offset> |
| 151 | into the scalar given by C<data> and offset C<dataoffset> and calls the |
152 | into the scalar given by C<data> and offset C<dataoffset> and calls the |
| 152 | callback without the actual number of bytes read (or -1 on error, just |
153 | callback without the actual number of bytes read (or -1 on error, just |
| 153 | like the syscall). |
154 | like the syscall). |
| 154 | |
155 | |
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156 | The C<$data> scalar I<MUST NOT> be modified in any way while the request |
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157 | is outstanding. Modifying it can result in segfaults or WW3 (if the |
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158 | necessary/optional hardware is installed). |
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159 | |
| 155 | Example: Read 15 bytes at offset 7 into scalar C<$buffer>, starting at |
160 | Example: Read 15 bytes at offset 7 into scalar C<$buffer>, starting at |
| 156 | offset C<0> within the scalar: |
161 | offset C<0> within the scalar: |
| 157 | |
162 | |
| 158 | aio_read $fh, 7, 15, $buffer, 0, sub { |
163 | aio_read $fh, 7, 15, $buffer, 0, sub { |
| 159 | $_[0] > 0 or die "read error: $!"; |
164 | $_[0] > 0 or die "read error: $!"; |
| … | |
… | |
| 349 | |
354 | |
| 350 | 1; |
355 | 1; |
| 351 | |
356 | |
| 352 | =head2 FORK BEHAVIOUR |
357 | =head2 FORK BEHAVIOUR |
| 353 | |
358 | |
| 354 | IO::AIO handles all outstanding AIO requests before the fork, destroys all |
359 | Before the fork IO::AIO enters a quiescent state where no requests can be |
| 355 | AIO threads, and recreates them in both the parent and the child after the |
360 | added in other threads and no results will be processed. After the fork |
| 356 | fork. |
361 | the parent simply leaves the quiescent state and continues request/result |
| 357 | |
362 | processing, while the child clears the request/result queue and starts the |
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363 | same number of threads as were in use by the parent. |
| 358 | |
364 | |
| 359 | =head1 SEE ALSO |
365 | =head1 SEE ALSO |
| 360 | |
366 | |
| 361 | L<Coro>, L<Linux::AIO>. |
367 | L<Coro>, L<Linux::AIO>. |
| 362 | |
368 | |
