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22 | poll => 'r', |
22 | poll => 'r', |
23 | cb => \&IO::AIO::poll_cb); |
23 | cb => \&IO::AIO::poll_cb); |
24 | |
24 | |
25 | # Glib/Gtk2 |
25 | # Glib/Gtk2 |
26 | add_watch Glib::IO IO::AIO::poll_fileno, |
26 | add_watch Glib::IO IO::AIO::poll_fileno, |
27 | in => sub { IO::AIO::poll_cb, 1 }; |
27 | in => sub { IO::AIO::poll_cb; 1 }; |
28 | |
28 | |
29 | # Tk |
29 | # Tk |
30 | Tk::Event::IO->fileevent (IO::AIO::poll_fileno, "", |
30 | Tk::Event::IO->fileevent (IO::AIO::poll_fileno, "", |
31 | readable => \&IO::AIO::poll_cb); |
31 | readable => \&IO::AIO::poll_cb); |
32 | |
32 | |
… | |
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48 | not well-supported (Linux doesn't allow them on normal files currently, |
48 | not well-supported (Linux doesn't allow them on normal files currently, |
49 | for example), and they would only support aio_read and aio_write, so the |
49 | for example), and they would only support aio_read and aio_write, so the |
50 | remaining functionality would have to be implemented using threads anyway. |
50 | remaining functionality would have to be implemented using threads anyway. |
51 | |
51 | |
52 | Although the module will work with in the presence of other threads, it is |
52 | Although the module will work with in the presence of other threads, it is |
53 | currently not reentrant, so use appropriate locking yourself. |
53 | currently not reentrant, so use appropriate locking yourself, always call |
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54 | C<poll_cb> from within the same thread, or never call C<poll_cb> (or other |
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55 | C<aio_> functions) recursively. |
54 | |
56 | |
55 | =cut |
57 | =cut |
56 | |
58 | |
57 | package IO::AIO; |
59 | package IO::AIO; |
58 | |
60 | |
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61 | no warnings; |
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62 | |
59 | use base 'Exporter'; |
63 | use base 'Exporter'; |
60 | |
64 | |
61 | use Fcntl (); |
65 | use Fcntl (); |
62 | |
66 | |
63 | BEGIN { |
67 | BEGIN { |
64 | $VERSION = 0.9; |
68 | $VERSION = 1.1; |
65 | |
69 | |
66 | @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 |
67 | aio_fsync aio_fdatasync aio_readahead); |
71 | aio_fsync aio_fdatasync aio_readahead); |
68 | @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); |
69 | |
73 | |
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81 | which must be a code reference. This code reference will get called with |
85 | which must be a code reference. This code reference will get called with |
82 | the syscall return code (e.g. most syscalls return C<-1> on error, unlike |
86 | the syscall return code (e.g. most syscalls return C<-1> on error, unlike |
83 | perl, which usually delivers "false") as it's sole argument when the given |
87 | perl, which usually delivers "false") as it's sole argument when the given |
84 | syscall has been executed asynchronously. |
88 | syscall has been executed asynchronously. |
85 | |
89 | |
86 | All functions that expect a filehandle will also accept a file descriptor. |
90 | All functions expecting a filehandle keep a copy of the filehandle |
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91 | internally until the request has finished. |
87 | |
92 | |
88 | The filenames you pass to these routines I<must> be absolute. The reason |
93 | The filenames you pass to these routines I<must> be absolute. The reason |
89 | for this is that at the time the request is being executed, the current |
94 | for this is that at the time the request is being executed, the current |
90 | working directory could have changed. Alternatively, you can make sure |
95 | working directory could have changed. Alternatively, you can make sure |
91 | that you never change the current working directory. |
96 | that you never change the current working directory. |
… | |
… | |
147 | print "read $_[0] bytes: <$buffer>\n"; |
152 | print "read $_[0] bytes: <$buffer>\n"; |
148 | }; |
153 | }; |
149 | |
154 | |
150 | =item aio_readahead $fh,$offset,$length, $callback |
155 | =item aio_readahead $fh,$offset,$length, $callback |
151 | |
156 | |
152 | Asynchronously reads the specified byte range into the page cache, using |
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153 | the C<readahead> syscall. If that syscall doesn't exist (likely if your OS |
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154 | isn't Linux) the status will be C<-1> and C<$!> is set to C<ENOSYS>. |
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155 | |
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156 | 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 |
157 | 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> |
158 | 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 |
159 | 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 |
160 | 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 |
161 | 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 |
162 | (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 |
163 | file. The current file offset of the file is left unchanged. |
164 | file. The current file offset of the file is left unchanged. |
164 | |
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 | |
165 | =item aio_stat $fh_or_path, $callback |
169 | =item aio_stat $fh_or_path, $callback |
166 | |
170 | |
167 | =item aio_lstat $fh, $callback |
171 | =item aio_lstat $fh, $callback |
168 | |
172 | |
169 | 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 |
… | |
… | |
195 | with the fsync result code. |
199 | with the fsync result code. |
196 | |
200 | |
197 | =item aio_fdatasync $fh, $callback |
201 | =item aio_fdatasync $fh, $callback |
198 | |
202 | |
199 | Asynchronously call fdatasync on the given filehandle and call the |
203 | Asynchronously call fdatasync on the given filehandle and call the |
200 | callback with the fdatasync result code. Might set C<$!> to C<ENOSYS> if |
204 | callback with the fdatasync result code. |
201 | C<fdatasync> is not available. |
205 | |
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206 | If this call isn't available because your OS lacks it or it couldn't be |
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207 | detected, it will be emulated by calling C<fsync> instead. |
202 | |
208 | |
203 | =back |
209 | =back |
204 | |
210 | |
205 | =head2 SUPPORT FUNCTIONS |
211 | =head2 SUPPORT FUNCTIONS |
206 | |
212 | |
… | |
… | |
308 | |
314 | |
309 | # support function to convert a fd into a perl filehandle |
315 | # support function to convert a fd into a perl filehandle |
310 | sub _fd2fh { |
316 | sub _fd2fh { |
311 | return undef if $_[0] < 0; |
317 | return undef if $_[0] < 0; |
312 | |
318 | |
313 | # try to be perl5.6-compatible |
319 | # try to generate nice filehandles |
314 | local *AIO_FH; |
320 | my $sym = "IO::AIO::fd#$_[0]"; |
315 | open AIO_FH, "+<&=$_[0]" |
321 | local *$sym; |
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322 | |
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323 | open *$sym, "+<&$_[0]" # usually under any unix |
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324 | or open *$sym, "<&$_[0]" # cygwin needs this |
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325 | or open *$sym, ">&$_[0]" # cygwin needs this |
316 | or return undef; |
326 | or return undef; |
317 | |
327 | |
318 | *AIO_FH |
328 | *$sym |
319 | } |
329 | } |
320 | |
330 | |
321 | min_parallel 4; |
331 | min_parallel 4; |
322 | |
332 | |
323 | END { |
333 | END { |