| … | |
… | |
| 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 | |
| … | |
… | |
| 59 | use base 'Exporter'; |
59 | use base 'Exporter'; |
| 60 | |
60 | |
| 61 | use Fcntl (); |
61 | use Fcntl (); |
| 62 | |
62 | |
| 63 | BEGIN { |
63 | BEGIN { |
| 64 | $VERSION = 0.3; |
64 | $VERSION = 0.4; |
| 65 | |
65 | |
| 66 | @EXPORT = qw(aio_read aio_write aio_open aio_close aio_stat aio_lstat aio_unlink |
66 | @EXPORT = qw(aio_read aio_write aio_open aio_close aio_stat aio_lstat aio_unlink |
| 67 | aio_fsync aio_fdatasync aio_readahead); |
67 | aio_fsync aio_fdatasync aio_readahead); |
| 68 | @EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel max_outstanding nreqs); |
68 | @EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel max_outstanding nreqs); |
| 69 | |
69 | |
| … | |
… | |
| 75 | |
75 | |
| 76 | =head2 AIO FUNCTIONS |
76 | =head2 AIO FUNCTIONS |
| 77 | |
77 | |
| 78 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
78 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
| 79 | with the same name (sans C<aio_>). The arguments are similar or identical, |
79 | with the same name (sans C<aio_>). The arguments are similar or identical, |
| 80 | and they all accept an additional C<$callback> argument which must be |
80 | and they all accept an additional (and optional) C<$callback> argument |
| 81 | a code reference. This code reference will get called with the syscall |
81 | which must be a code reference. This code reference will get called with |
| 82 | return code (e.g. most syscalls return C<-1> on error, unlike perl, which |
82 | the syscall return code (e.g. most syscalls return C<-1> on error, unlike |
| 83 | usually delivers "false") as it's sole argument when the given syscall has |
83 | perl, which usually delivers "false") as it's sole argument when the given |
| 84 | been executed asynchronously. |
84 | syscall has been executed asynchronously. |
| 85 | |
85 | |
| 86 | All functions that expect a filehandle will also accept a file descriptor. |
86 | All functions that expect a filehandle will also accept a file descriptor. |
| 87 | |
87 | |
| 88 | The filenames you pass to these routines I<must> be absolute. The reason |
88 | The filenames you pass to these routines I<must> be absolute. The reason |
| 89 | is that at the time the request is being executed, the current working |
89 | is that at the time the request is being executed, the current working |
| … | |
… | |
| 129 | Reads or writes C<length> bytes from the specified C<fh> and C<offset> |
129 | Reads or writes C<length> bytes from the specified C<fh> and C<offset> |
| 130 | into the scalar given by C<data> and offset C<dataoffset> and calls the |
130 | into the scalar given by C<data> and offset C<dataoffset> and calls the |
| 131 | callback without the actual number of bytes read (or -1 on error, just |
131 | callback without the actual number of bytes read (or -1 on error, just |
| 132 | like the syscall). |
132 | like the syscall). |
| 133 | |
133 | |
| 134 | Example: Read 15 bytes at offset 7 into scalar C<$buffer>, strating at |
134 | Example: Read 15 bytes at offset 7 into scalar C<$buffer>, starting at |
| 135 | offset C<0> within the scalar: |
135 | offset C<0> within the scalar: |
| 136 | |
136 | |
| 137 | aio_read $fh, 7, 15, $buffer, 0, sub { |
137 | aio_read $fh, 7, 15, $buffer, 0, sub { |
| 138 | $_[0] > 0 or die "read error: $!"; |
138 | $_[0] > 0 or die "read error: $!"; |
| 139 | print "read $_[0] bytes: <$buffer>\n"; |
139 | print "read $_[0] bytes: <$buffer>\n"; |
| 140 | }; |
140 | }; |
| 141 | |
141 | |
| 142 | =item aio_readahead $fh,$offset,$length, $callback |
142 | =item aio_readahead $fh,$offset,$length, $callback |
| 143 | |
143 | |
| 144 | Asynchronously reads the specified byte range into the page cache, using |
144 | Asynchronously reads the specified byte range into the page cache, using |
| 145 | the C<readahead> syscall. If that syscall doesn't exist the status will be |
145 | the C<readahead> syscall. If that syscall doesn't exist (likely if your OS |
| 146 | C<-1> and C<$!> is set to ENOSYS. |
146 | isn't Linux) the status will be C<-1> and C<$!> is set to ENOSYS. |
| 147 | |
147 | |
| 148 | readahead() populates the page cache with data from a file so that |
148 | readahead() populates the page cache with data from a file so that |
| 149 | subsequent reads from that file will not block on disk I/O. The C<$offset> |
149 | subsequent reads from that file will not block on disk I/O. The C<$offset> |
| 150 | argument specifies the starting point from which data is to be read and |
150 | argument specifies the starting point from which data is to be read and |
| 151 | C<$length> specifies the number of bytes to be read. I/O is performed in |
151 | C<$length> specifies the number of bytes to be read. I/O is performed in |
