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| 66 | |
66 | |
| 67 | BEGIN { |
67 | BEGIN { |
| 68 | $VERSION = 1.1; |
68 | $VERSION = 1.1; |
| 69 | |
69 | |
| 70 | @EXPORT = qw(aio_read aio_write aio_open aio_close aio_stat aio_lstat aio_unlink |
70 | @EXPORT = qw(aio_read aio_write aio_open aio_close aio_stat aio_lstat aio_unlink |
| 71 | aio_fsync aio_fdatasync aio_readahead); |
71 | 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); |
72 | @EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel max_outstanding nreqs); |
| 73 | |
73 | |
| 74 | require XSLoader; |
74 | require XSLoader; |
| 75 | XSLoader::load IO::AIO, $VERSION; |
75 | XSLoader::load IO::AIO, $VERSION; |
| 76 | } |
76 | } |
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| 152 | print "read $_[0] bytes: <$buffer>\n"; |
152 | print "read $_[0] bytes: <$buffer>\n"; |
| 153 | }; |
153 | }; |
| 154 | |
154 | |
| 155 | =item aio_readahead $fh,$offset,$length, $callback |
155 | =item aio_readahead $fh,$offset,$length, $callback |
| 156 | |
156 | |
| 157 | Asynchronously reads the specified byte range into the page cache, using |
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| 158 | the C<readahead> syscall. If that syscall doesn't exist (likely if your OS |
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| 159 | isn't Linux) the status will be C<-1> and C<$!> is set to C<ENOSYS>. |
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| 160 | |
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| 161 | C<aio_readahead> populates the page cache with data from a file so that |
157 | C<aio_readahead> populates the page cache with data from a file so that |
| 162 | subsequent reads from that file will not block on disk I/O. The C<$offset> |
158 | subsequent reads from that file will not block on disk I/O. The C<$offset> |
| 163 | argument specifies the starting point from which data is to be read and |
159 | argument specifies the starting point from which data is to be read and |
| 164 | C<$length> specifies the number of bytes to be read. I/O is performed in |
160 | C<$length> specifies the number of bytes to be read. I/O is performed in |
| 165 | whole pages, so that offset is effectively rounded down to a page boundary |
161 | whole pages, so that offset is effectively rounded down to a page boundary |
| 166 | and bytes are read up to the next page boundary greater than or equal to |
162 | and bytes are read up to the next page boundary greater than or equal to |
| 167 | (off-set+length). C<aio_readahead> does not read beyond the end of the |
163 | (off-set+length). C<aio_readahead> does not read beyond the end of the |
| 168 | file. The current file offset of the file is left unchanged. |
164 | file. The current file offset of the file is left unchanged. |
| 169 | |
165 | |
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166 | If that syscall doesn't exist (likely if your OS isn't Linux) it will be |
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167 | emulated by simply reading the data, which would have a similar effect. |
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168 | |
| 170 | =item aio_stat $fh_or_path, $callback |
169 | =item aio_stat $fh_or_path, $callback |
| 171 | |
170 | |
| 172 | =item aio_lstat $fh, $callback |
171 | =item aio_lstat $fh, $callback |
| 173 | |
172 | |
| 174 | Works like perl's C<stat> or C<lstat> in void context. The callback will |
173 | Works like perl's C<stat> or C<lstat> in void context. The callback will |
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| 192 | =item aio_unlink $pathname, $callback |
191 | =item aio_unlink $pathname, $callback |
| 193 | |
192 | |
| 194 | Asynchronously unlink (delete) a file and call the callback with the |
193 | Asynchronously unlink (delete) a file and call the callback with the |
| 195 | result code. |
194 | result code. |
| 196 | |
195 | |
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196 | =item aio_rmdir $pathname, $callback |
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197 | |
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198 | Asynchronously rmdir (delete) a directory and call the callback with the |
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199 | result code. |
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200 | |
| 197 | =item aio_fsync $fh, $callback |
201 | =item aio_fsync $fh, $callback |
| 198 | |
202 | |
| 199 | Asynchronously call fsync on the given filehandle and call the callback |
203 | Asynchronously call fsync on the given filehandle and call the callback |
| 200 | with the fsync result code. |
204 | with the fsync result code. |
| 201 | |
205 | |
| 202 | =item aio_fdatasync $fh, $callback |
206 | =item aio_fdatasync $fh, $callback |
| 203 | |
207 | |
| 204 | Asynchronously call fdatasync on the given filehandle and call the |
208 | Asynchronously call fdatasync on the given filehandle and call the |
| 205 | callback with the fdatasync result code. Might set C<$!> to C<ENOSYS> if |
209 | callback with the fdatasync result code. |
| 206 | C<fdatasync> is not available. |
210 | |
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211 | If this call isn't available because your OS lacks it or it couldn't be |
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212 | detected, it will be emulated by calling C<fsync> instead. |
| 207 | |
213 | |
| 208 | =back |
214 | =back |
| 209 | |
215 | |
| 210 | =head2 SUPPORT FUNCTIONS |
216 | =head2 SUPPORT FUNCTIONS |
| 211 | |
217 | |
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| 316 | return undef if $_[0] < 0; |
322 | return undef if $_[0] < 0; |
| 317 | |
323 | |
| 318 | # try to generate nice filehandles |
324 | # try to generate nice filehandles |
| 319 | my $sym = "IO::AIO::fd#$_[0]"; |
325 | my $sym = "IO::AIO::fd#$_[0]"; |
| 320 | local *$sym; |
326 | local *$sym; |
| 321 | open *$sym, "+<&=$_[0]" |
327 | |
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328 | open *$sym, "+<&=$_[0]" # usually works under any unix |
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329 | or open *$sym, "<&=$_[0]" # cygwin needs this |
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330 | or open *$sym, ">&=$_[0]" # or this |
| 322 | or return undef; |
331 | or return undef; |
| 323 | |
332 | |
| 324 | *$sym |
333 | *$sym |
| 325 | } |
334 | } |
| 326 | |
335 | |
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| 330 | max_parallel 0; |
339 | max_parallel 0; |
| 331 | } |
340 | } |
| 332 | |
341 | |
| 333 | 1; |
342 | 1; |
| 334 | |
343 | |
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344 | =head2 FORK BEHAVIOUR |
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345 | |
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346 | IO::AIO handles all outstanding AIO requests before the fork, destroys all |
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347 | AIO threads, and recreates them in both the parent and the child after the |
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348 | fork. |
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349 | |
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350 | |
| 335 | =head1 SEE ALSO |
351 | =head1 SEE ALSO |
| 336 | |
352 | |
| 337 | L<Coro>, L<Linux::AIO>. |
353 | L<Coro>, L<Linux::AIO>. |
| 338 | |
354 | |
| 339 | =head1 AUTHOR |
355 | =head1 AUTHOR |
