… | |
… | |
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 | \&IO::AIO::poll_cb; |
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 | |
… | |
… | |
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 = 0.3; |
68 | $VERSION = 1.1; |
65 | |
69 | |
66 | @EXPORT = qw(aio_read aio_write aio_open aio_close aio_stat aio_lstat aio_unlink |
70 | @EXPORT = qw(aio_read aio_write aio_open aio_close aio_stat aio_lstat aio_unlink |
67 | aio_fsync aio_fdatasync aio_readahead); |
71 | aio_fsync aio_fdatasync aio_readahead); |
68 | @EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel max_outstanding nreqs); |
72 | @EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel max_outstanding nreqs); |
69 | |
73 | |
… | |
… | |
75 | |
79 | |
76 | =head2 AIO FUNCTIONS |
80 | =head2 AIO FUNCTIONS |
77 | |
81 | |
78 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
82 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
79 | with the same name (sans C<aio_>). The arguments are similar or identical, |
83 | with the same name (sans C<aio_>). The arguments are similar or identical, |
80 | and they all accept an additional C<$callback> argument which must be |
84 | and they all accept an additional (and optional) C<$callback> argument |
81 | a code reference. This code reference will get called with the syscall |
85 | which must be a code reference. This code reference will get called with |
82 | return code (e.g. most syscalls return C<-1> on error, unlike perl, which |
86 | the syscall return code (e.g. most syscalls return C<-1> on error, unlike |
83 | usually delivers "false") as it's sole argument when the given syscall has |
87 | perl, which usually delivers "false") as it's sole argument when the given |
84 | 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 | is that at the time the request is being executed, the current working |
94 | for this is that at the time the request is being executed, the current |
90 | directory could have changed. Alternatively, you can make sure that you |
95 | working directory could have changed. Alternatively, you can make sure |
91 | never change the current working directory. |
96 | that you never change the current working directory. |
92 | |
97 | |
93 | =over 4 |
98 | =over 4 |
94 | |
99 | |
95 | =item aio_open $pathname, $flags, $mode, $callback |
100 | =item aio_open $pathname, $flags, $mode, $callback |
96 | |
101 | |
… | |
… | |
98 | created filehandle for the file. |
103 | created filehandle for the file. |
99 | |
104 | |
100 | The pathname passed to C<aio_open> must be absolute. See API NOTES, above, |
105 | The pathname passed to C<aio_open> must be absolute. See API NOTES, above, |
101 | for an explanation. |
106 | for an explanation. |
102 | |
107 | |
103 | The C<$mode> argument is a bitmask. See the C<Fcntl> module for a |
108 | The C<$flags> argument is a bitmask. See the C<Fcntl> module for a |
104 | list. They are the same as used in C<sysopen>. |
109 | list. They are the same as used by C<sysopen>. |
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110 | |
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111 | Likewise, C<$mode> specifies the mode of the newly created file, if it |
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112 | didn't exist and C<O_CREAT> has been given, just like perl's C<sysopen>, |
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113 | except that it is mandatory (i.e. use C<0> if you don't create new files, |
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114 | and C<0666> or C<0777> if you do). |
105 | |
115 | |
106 | Example: |
116 | Example: |
107 | |
117 | |
108 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
118 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
109 | if ($_[0]) { |
119 | if ($_[0]) { |
… | |
… | |
116 | |
126 | |
117 | =item aio_close $fh, $callback |
127 | =item aio_close $fh, $callback |
118 | |
128 | |
119 | Asynchronously close a file and call the callback with the result |
129 | Asynchronously close a file and call the callback with the result |
120 | code. I<WARNING:> although accepted, you should not pass in a perl |
130 | code. I<WARNING:> although accepted, you should not pass in a perl |
121 | filehandle here, as perl will likely close the file descriptor itself when |
131 | filehandle here, as perl will likely close the file descriptor another |
122 | the filehandle is destroyed. Normally, you can safely call perls C<close> |
132 | time when the filehandle is destroyed. Normally, you can safely call perls |
123 | or just let filehandles go out of scope. |
133 | C<close> or just let filehandles go out of scope. |
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134 | |
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135 | This is supposed to be a bug in the API, so that might change. It's |
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136 | therefore best to avoid this function. |
124 | |
137 | |
125 | =item aio_read $fh,$offset,$length, $data,$dataoffset,$callback |
138 | =item aio_read $fh,$offset,$length, $data,$dataoffset,$callback |
126 | |
139 | |
127 | =item aio_write $fh,$offset,$length, $data,$dataoffset,$callback |
140 | =item aio_write $fh,$offset,$length, $data,$dataoffset,$callback |
128 | |
141 | |
129 | Reads or writes C<length> bytes from the specified C<fh> and C<offset> |
142 | Reads or writes C<length> bytes from the specified C<fh> and C<offset> |
130 | into the scalar given by C<data> and offset C<dataoffset> and calls the |
143 | into the scalar given by C<data> and offset C<dataoffset> and calls the |
131 | callback without the actual number of bytes read (or -1 on error, just |
144 | callback without the actual number of bytes read (or -1 on error, just |
132 | like the syscall). |
145 | like the syscall). |
133 | |
146 | |
134 | Example: Read 15 bytes at offset 7 into scalar C<$buffer>, strating at |
147 | Example: Read 15 bytes at offset 7 into scalar C<$buffer>, starting at |
135 | offset C<0> within the scalar: |
148 | offset C<0> within the scalar: |
136 | |
149 | |
137 | aio_read $fh, 7, 15, $buffer, 0, sub { |
150 | aio_read $fh, 7, 15, $buffer, 0, sub { |
138 | $_[0] > 0 or die "read error: $!"; |
151 | $_[0] > 0 or die "read error: $!"; |
139 | print "read $_[0] bytes: <$buffer>\n"; |
152 | print "read $_[0] bytes: <$buffer>\n"; |
140 | }; |
153 | }; |
141 | |
154 | |
142 | =item aio_readahead $fh,$offset,$length, $callback |
155 | =item aio_readahead $fh,$offset,$length, $callback |
143 | |
156 | |
144 | Asynchronously reads the specified byte range into the page cache, using |
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145 | the C<readahead> syscall. If that syscall doesn't exist the status will be |
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146 | C<-1> and C<$!> is set to ENOSYS. |
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147 | |
|
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148 | 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 |
149 | 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> |
150 | 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 |
151 | 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 |
152 | 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 |
153 | 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 |
154 | (off-set+length). 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 |
155 | file. The current file offset of the file is left unchanged. |
164 | file. The current file offset of the file is left unchanged. |
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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. |
156 | |
168 | |
157 | =item aio_stat $fh_or_path, $callback |
169 | =item aio_stat $fh_or_path, $callback |
158 | |
170 | |
159 | =item aio_lstat $fh, $callback |
171 | =item aio_lstat $fh, $callback |
160 | |
172 | |
… | |
… | |
189 | =item aio_fdatasync $fh, $callback |
201 | =item aio_fdatasync $fh, $callback |
190 | |
202 | |
191 | Asynchronously call fdatasync on the given filehandle and call the |
203 | Asynchronously call fdatasync on the given filehandle and call the |
192 | callback with the fdatasync result code. |
204 | callback with the fdatasync result code. |
193 | |
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. |
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208 | |
194 | =back |
209 | =back |
195 | |
210 | |
196 | =head2 SUPPORT FUNCTIONS |
211 | =head2 SUPPORT FUNCTIONS |
197 | |
212 | |
198 | =over 4 |
213 | =over 4 |
199 | |
214 | |
200 | =item $fileno = IO::AIO::poll_fileno |
215 | =item $fileno = IO::AIO::poll_fileno |
201 | |
216 | |
202 | Return the I<request result pipe filehandle>. This filehandle must be |
217 | Return the I<request result pipe file descriptor>. This filehandle must be |
203 | polled for reading by some mechanism outside this module (e.g. Event |
218 | polled for reading by some mechanism outside this module (e.g. Event or |
204 | or select, see below). If the pipe becomes readable you have to call |
219 | select, see below or the SYNOPSIS). If the pipe becomes readable you have |
205 | C<poll_cb> to check the results. |
220 | to call C<poll_cb> to check the results. |
206 | |
221 | |
207 | See C<poll_cb> for an example. |
222 | See C<poll_cb> for an example. |
208 | |
223 | |
209 | =item IO::AIO::poll_cb |
224 | =item IO::AIO::poll_cb |
210 | |
225 | |
211 | Process all outstanding events on the result pipe. You have to call this |
226 | Process all outstanding events on the result pipe. You have to call this |
212 | regularly. Returns the number of events processed. Returns immediately |
227 | regularly. Returns the number of events processed. Returns immediately |
213 | when no events are outstanding. |
228 | when no events are outstanding. |
214 | |
229 | |
215 | You can use Event to multiplex, e.g.: |
230 | Example: Install an Event watcher that automatically calls |
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231 | IO::AIO::poll_cb with high priority: |
216 | |
232 | |
217 | Event->io (fd => IO::AIO::poll_fileno, |
233 | Event->io (fd => IO::AIO::poll_fileno, |
218 | poll => 'r', async => 1, |
234 | poll => 'r', async => 1, |
219 | cb => \&IO::AIO::poll_cb); |
235 | cb => \&IO::AIO::poll_cb); |
220 | |
236 | |
221 | =item IO::AIO::poll_wait |
237 | =item IO::AIO::poll_wait |
222 | |
238 | |
223 | Wait till the result filehandle becomes ready for reading (simply does a |
239 | Wait till the result filehandle becomes ready for reading (simply does a |
224 | select on the filehandle. This is useful if you want to synchronously wait |
240 | C<select> on the filehandle. This is useful if you want to synchronously wait |
225 | for some requests to finish). |
241 | for some requests to finish). |
226 | |
242 | |
227 | See C<nreqs> for an example. |
243 | See C<nreqs> for an example. |
228 | |
244 | |
229 | =item IO::AIO::nreqs |
245 | =item IO::AIO::nreqs |
230 | |
246 | |
231 | Returns the number of requests currently outstanding. |
247 | Returns the number of requests currently outstanding (i.e. for which their |
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248 | callback has not been invoked yet). |
232 | |
249 | |
233 | Example: wait till there are no outstanding requests anymore: |
250 | Example: wait till there are no outstanding requests anymore: |
234 | |
251 | |
235 | IO::AIO::poll_wait, IO::AIO::poll_cb |
252 | IO::AIO::poll_wait, IO::AIO::poll_cb |
236 | while IO::AIO::nreqs; |
253 | while IO::AIO::nreqs; |
… | |
… | |
297 | |
314 | |
298 | # support function to convert a fd into a perl filehandle |
315 | # support function to convert a fd into a perl filehandle |
299 | sub _fd2fh { |
316 | sub _fd2fh { |
300 | return undef if $_[0] < 0; |
317 | return undef if $_[0] < 0; |
301 | |
318 | |
302 | # try to be perl5.6-compatible |
319 | # try to generate nice filehandles |
303 | local *AIO_FH; |
320 | my $sym = "IO::AIO::fd#$_[0]"; |
304 | 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 |
305 | or return undef; |
326 | or return undef; |
306 | |
327 | |
307 | *AIO_FH |
328 | *$sym |
308 | } |
329 | } |
309 | |
330 | |
310 | min_parallel 4; |
331 | min_parallel 4; |
311 | |
332 | |
312 | END { |
333 | END { |