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20 | poll => 'r', |
20 | poll => 'r', |
21 | cb => \&IO::AIO::poll_cb); |
21 | cb => \&IO::AIO::poll_cb); |
22 | |
22 | |
23 | # Glib/Gtk2 |
23 | # Glib/Gtk2 |
24 | add_watch Glib::IO IO::AIO::poll_fileno, |
24 | add_watch Glib::IO IO::AIO::poll_fileno, |
25 | \&IO::AIO::poll_cb; |
25 | in => sub { IO::AIO::poll_cb, 1 }; |
26 | |
26 | |
27 | # Tk |
27 | # Tk |
28 | Tk::Event::IO->fileevent (IO::AIO::poll_fileno, "", |
28 | Tk::Event::IO->fileevent (IO::AIO::poll_fileno, "", |
29 | readable => \&IO::AIO::poll_cb); |
29 | readable => \&IO::AIO::poll_cb); |
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30 | |
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31 | # Danga::Socket |
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32 | Danga::Socket->AddOtherFds (IO::AIO::poll_fileno => |
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33 | \&IO::AIO::poll_cb); |
30 | |
34 | |
31 | DESCRIPTION |
35 | DESCRIPTION |
32 | This module implements asynchronous I/O using whatever means your |
36 | This module implements asynchronous I/O using whatever means your |
33 | operating system supports. |
37 | operating system supports. |
34 | |
38 | |
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47 | |
51 | |
48 | FUNCTIONS |
52 | FUNCTIONS |
49 | AIO FUNCTIONS |
53 | AIO FUNCTIONS |
50 | All the "aio_*" calls are more or less thin wrappers around the syscall |
54 | All the "aio_*" calls are more or less thin wrappers around the syscall |
51 | with the same name (sans "aio_"). The arguments are similar or |
55 | with the same name (sans "aio_"). The arguments are similar or |
52 | identical, and they all accept an additional $callback argument which |
56 | identical, and they all accept an additional (and optional) $callback |
53 | must be a code reference. This code reference will get called with the |
57 | argument which must be a code reference. This code reference will get |
54 | syscall return code (e.g. most syscalls return -1 on error, unlike perl, |
58 | called with the syscall return code (e.g. most syscalls return -1 on |
55 | which usually delivers "false") as it's sole argument when the given |
59 | error, unlike perl, which usually delivers "false") as it's sole |
56 | syscall has been executed asynchronously. |
60 | argument when the given syscall has been executed asynchronously. |
57 | |
61 | |
58 | All functions that expect a filehandle will also accept a file |
62 | All functions that expect a filehandle will also accept a file |
59 | descriptor. |
63 | descriptor. |
60 | |
64 | |
61 | The filenames you pass to these routines *must* be absolute. The reason |
65 | The filenames you pass to these routines *must* be absolute. The reason |
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96 | Reads or writes "length" bytes from the specified "fh" and "offset" |
100 | Reads or writes "length" bytes from the specified "fh" and "offset" |
97 | into the scalar given by "data" and offset "dataoffset" and calls |
101 | into the scalar given by "data" and offset "dataoffset" and calls |
98 | the callback without the actual number of bytes read (or -1 on |
102 | the callback without the actual number of bytes read (or -1 on |
99 | error, just like the syscall). |
103 | error, just like the syscall). |
100 | |
104 | |
101 | Example: Read 15 bytes at offset 7 into scalar $buffer, strating at |
105 | Example: Read 15 bytes at offset 7 into scalar $buffer, starting at |
102 | offset 0 within the scalar: |
106 | offset 0 within the scalar: |
103 | |
107 | |
104 | aio_read $fh, 7, 15, $buffer, 0, sub { |
108 | aio_read $fh, 7, 15, $buffer, 0, sub { |
105 | $_[0] > 0 or die "read error: $!"; |
109 | $_[0] > 0 or die "read error: $!"; |
106 | print "read $_[0] bytes: <$buffer>\n"; |
110 | print "read $_[0] bytes: <$buffer>\n"; |
107 | }; |
111 | }; |
108 | |
112 | |
109 | aio_readahead $fh,$offset,$length, $callback |
113 | aio_readahead $fh,$offset,$length, $callback |
110 | Asynchronously reads the specified byte range into the page cache, |
114 | Asynchronously reads the specified byte range into the page cache, |
111 | using the "readahead" syscall. If that syscall doesn't exist the |
115 | using the "readahead" syscall. If that syscall doesn't exist (likely |
112 | status will be -1 and $! is set to ENOSYS. |
116 | if your OS isn't Linux) the status will be -1 and $! is set to |
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117 | ENOSYS. |
113 | |
118 | |
114 | readahead() populates the page cache with data from a file so that |
119 | readahead() populates the page cache with data from a file so that |
115 | subsequent reads from that file will not block on disk I/O. The |
120 | subsequent reads from that file will not block on disk I/O. The |
116 | $offset argument specifies the starting point from which data is to |
121 | $offset argument specifies the starting point from which data is to |
117 | be read and $length specifies the number of bytes to be read. I/O is |
122 | be read and $length specifies the number of bytes to be read. I/O is |
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187 | Example: wait till there are no outstanding requests anymore: |
192 | Example: wait till there are no outstanding requests anymore: |
188 | |
193 | |
189 | IO::AIO::poll_wait, IO::AIO::poll_cb |
194 | IO::AIO::poll_wait, IO::AIO::poll_cb |
190 | while IO::AIO::nreqs; |
195 | while IO::AIO::nreqs; |
191 | |
196 | |
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197 | IO::AIO::flush |
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198 | Wait till all outstanding AIO requests have been handled. |
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199 | |
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200 | Strictly equivalent to: |
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201 | |
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202 | IO::AIO::poll_wait, IO::AIO::poll_cb |
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203 | while IO::AIO::nreqs; |
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204 | |
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205 | IO::AIO::poll |
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206 | Waits until some requests have been handled. |
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207 | |
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208 | Strictly equivalent to: |
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209 | |
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210 | IO::AIO::poll_wait, IO::AIO::poll_cb |
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211 | if IO::AIO::nreqs; |
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212 | |
192 | IO::AIO::min_parallel $nthreads |
213 | IO::AIO::min_parallel $nthreads |
193 | Set the minimum number of AIO threads to $nthreads. The default is |
214 | Set the minimum number of AIO threads to $nthreads. The default is |
194 | 1, which means a single asynchronous operation can be done at one |
215 | 1, which means a single asynchronous operation can be done at one |
195 | time (the number of outstanding operations, however, is unlimited). |
216 | time (the number of outstanding operations, however, is unlimited). |
196 | |
217 | |