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189 | use strict 'vars'; |
189 | use strict 'vars'; |
190 | |
190 | |
191 | use base 'Exporter'; |
191 | use base 'Exporter'; |
192 | |
192 | |
193 | BEGIN { |
193 | BEGIN { |
194 | our $VERSION = '2.4'; |
194 | our $VERSION = '2.5'; |
195 | |
195 | |
196 | our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat |
196 | our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat |
197 | aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink |
197 | aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink |
198 | aio_readlink aio_fsync aio_fdatasync aio_readahead aio_rename aio_link |
198 | aio_readlink aio_fsync aio_fdatasync aio_readahead aio_rename aio_link |
199 | aio_move aio_copy aio_group aio_nop aio_mknod aio_load aio_rmtree aio_mkdir |
199 | aio_move aio_copy aio_group aio_nop aio_mknod aio_load aio_rmtree aio_mkdir |
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… | |
311 | |
311 | |
312 | |
312 | |
313 | =item aio_close $fh, $callback->($status) |
313 | =item aio_close $fh, $callback->($status) |
314 | |
314 | |
315 | Asynchronously close a file and call the callback with the result |
315 | Asynchronously close a file and call the callback with the result |
316 | code. I<WARNING:> although accepted, you should not pass in a perl |
316 | code. |
317 | filehandle here, as perl will likely close the file descriptor another |
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318 | time when the filehandle is destroyed. Normally, you can safely call perls |
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319 | C<close> or just let filehandles go out of scope. |
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320 | |
317 | |
321 | This is supposed to be a bug in the API, so that might change. It's |
318 | Unlike the other functions operating on files, this function uses the |
322 | therefore best to avoid this function. |
319 | PerlIO layer to close the filehandle. The reason is that the PerlIO API |
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320 | insists on closing the underlying fd itself, no matter what, and doesn't |
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|
321 | allow modifications to the fd. Unfortunately, it is not clear that you can |
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322 | call PerlIO from different threads (actually, its quite clear that this |
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323 | won't work in some cases), so while it likely works perfectly with simple |
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324 | file handles (such as the ones created by C<aio_open>) it might fail in |
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325 | interesting ways for others. |
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326 | |
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327 | Having said that, aio_close tries to clean up the filehandle as much as |
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328 | possible before handing it to an io thread, and generally does work. |
323 | |
329 | |
324 | |
330 | |
325 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
331 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
326 | |
332 | |
327 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
333 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
… | |
… | |
329 | Reads or writes C<$length> bytes from the specified C<$fh> and C<$offset> |
335 | Reads or writes C<$length> bytes from the specified C<$fh> and C<$offset> |
330 | into the scalar given by C<$data> and offset C<$dataoffset> and calls the |
336 | into the scalar given by C<$data> and offset C<$dataoffset> and calls the |
331 | callback without the actual number of bytes read (or -1 on error, just |
337 | callback without the actual number of bytes read (or -1 on error, just |
332 | like the syscall). |
338 | like the syscall). |
333 | |
339 | |
334 | If C<$offset> is undefined, then the current file offset will be used (and |
340 | If C<$offset> is undefined, then the current file descriptor offset will |
335 | updated), otherwise the file offset will not be changed by these calls. |
341 | be used (and updated), otherwise the file descriptor offset will not be |
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|
342 | changed by these calls. |
336 | |
343 | |
337 | If C<$length> is undefined in C<aio_write>, use the remaining length of C<$data>. |
344 | If C<$length> is undefined in C<aio_write>, use the remaining length of C<$data>. |
338 | |
345 | |
339 | If C<$dataoffset> is less than zero, it will be counted from the end of |
346 | If C<$dataoffset> is less than zero, it will be counted from the end of |
340 | C<$data>. |
347 | C<$data>. |
341 | |
348 | |
342 | The C<$data> scalar I<MUST NOT> be modified in any way while the request |
349 | The C<$data> scalar I<MUST NOT> be modified in any way while the request |
… | |
… | |
1206 | This is a very bad function to use in interactive programs because it |
1213 | This is a very bad function to use in interactive programs because it |
1207 | blocks, and a bad way to reduce concurrency because it is inexact: Better |
1214 | blocks, and a bad way to reduce concurrency because it is inexact: Better |
1208 | use an C<aio_group> together with a feed callback. |
1215 | use an C<aio_group> together with a feed callback. |
1209 | |
1216 | |
1210 | Sets the maximum number of outstanding requests to C<$nreqs>. If you |
1217 | Sets the maximum number of outstanding requests to C<$nreqs>. If you |
1211 | to queue up more than this number of requests, the next call to the |
1218 | do queue up more than this number of requests, the next call to the |
1212 | C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>) |
1219 | C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>) |
1213 | function will block until the limit is no longer exceeded. |
1220 | function will block until the limit is no longer exceeded. |
1214 | |
1221 | |
1215 | The default value is very large, so there is no practical limit on the |
1222 | The default value is very large, so there is no practical limit on the |
1216 | number of outstanding requests. |
1223 | number of outstanding requests. |
… | |
… | |
1246 | but not yet processed by poll_cb). |
1253 | but not yet processed by poll_cb). |
1247 | |
1254 | |
1248 | =back |
1255 | =back |
1249 | |
1256 | |
1250 | =cut |
1257 | =cut |
1251 | |
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1252 | # support function to convert a fd into a perl filehandle |
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1253 | sub _fd2fh { |
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1254 | return undef if $_[0] < 0; |
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1255 | |
|
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1256 | # try to generate nice filehandles |
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1257 | my $sym = "IO::AIO::fd#$_[0]"; |
|
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1258 | local *$sym; |
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1259 | |
|
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1260 | open *$sym, "+<&=$_[0]" # usually works under any unix |
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1261 | or open *$sym, "<&=$_[0]" # cygwin needs this |
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1262 | or open *$sym, ">&=$_[0]" # or this |
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1263 | or return undef; |
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1264 | |
|
|
1265 | *$sym |
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|
1266 | } |
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1267 | |
1258 | |
1268 | min_parallel 8; |
1259 | min_parallel 8; |
1269 | |
1260 | |
1270 | END { flush } |
1261 | END { flush } |
1271 | |
1262 | |