… | |
… | |
18 | }; |
18 | }; |
19 | |
19 | |
20 | # version 2+ has request and group objects |
20 | # version 2+ has request and group objects |
21 | use IO::AIO 2; |
21 | use IO::AIO 2; |
22 | |
22 | |
|
|
23 | aioreq_pri 4; # give next request a very high priority |
23 | my $req = aio_unlink "/tmp/file", sub { }; |
24 | my $req = aio_unlink "/tmp/file", sub { }; |
24 | $req->cancel; # cancel request if still in queue |
25 | $req->cancel; # cancel request if still in queue |
25 | |
26 | |
26 | my $grp = aio_group sub { print "all stats done\n" }; |
27 | my $grp = aio_group sub { print "all stats done\n" }; |
27 | add $grp aio_stat "..." for ...; |
28 | add $grp aio_stat "..." for ...; |
… | |
… | |
59 | on many operating systems. However, they are often not well-supported |
60 | on many operating systems. However, they are often not well-supported |
60 | (Linux doesn't allow them on normal files currently, for example), |
61 | (Linux doesn't allow them on normal files currently, for example), |
61 | and they would only support aio_read and aio_write, so the remaining |
62 | and they would only support aio_read and aio_write, so the remaining |
62 | functionality would have to be implemented using threads anyway. |
63 | functionality would have to be implemented using threads anyway. |
63 | |
64 | |
64 | Although the module will work with in the presence of other threads, it is |
65 | Although the module will work with in the presence of other threads, |
65 | currently not reentrant, so use appropriate locking yourself, always call |
66 | it is currently not reentrant in any way, so use appropriate locking |
66 | C<poll_cb> from within the same thread, or never call C<poll_cb> (or other |
67 | yourself, always call C<poll_cb> from within the same thread, or never |
67 | C<aio_> functions) recursively. |
68 | call C<poll_cb> (or other C<aio_> functions) recursively. |
68 | |
69 | |
69 | =cut |
70 | =cut |
70 | |
71 | |
71 | package IO::AIO; |
72 | package IO::AIO; |
72 | |
73 | |
… | |
… | |
80 | |
81 | |
81 | our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat |
82 | our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat |
82 | aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink |
83 | aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink |
83 | aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move |
84 | aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move |
84 | aio_group aio_nop); |
85 | aio_group aio_nop); |
85 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri)); |
86 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); |
86 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
87 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
87 | min_parallel max_parallel max_outstanding nreqs); |
88 | min_parallel max_parallel max_outstanding nreqs); |
88 | |
89 | |
89 | @IO::AIO::GRP::ISA = 'IO::AIO::REQ'; |
90 | @IO::AIO::GRP::ISA = 'IO::AIO::REQ'; |
90 | |
91 | |
… | |
… | |
122 | your pathnames to the locale (or other) encoding in effect in the user |
123 | your pathnames to the locale (or other) encoding in effect in the user |
123 | environment, d) use Glib::filename_from_unicode on unicode filenames or e) |
124 | environment, d) use Glib::filename_from_unicode on unicode filenames or e) |
124 | use something else. |
125 | use something else. |
125 | |
126 | |
126 | =over 4 |
127 | =over 4 |
|
|
128 | |
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|
129 | =item aioreq_pri $pri |
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130 | |
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131 | Sets the priority for the next aio request. The default priority |
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|
132 | is C<0>, the minimum and maximum priorities are C<-4> and C<4>, |
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133 | respectively. Requests with higher priority will be serviced first. |
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134 | |
|
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135 | The priority will be reset to C<0> after each call to one of the C<aio_> |
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136 | functions. |
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137 | |
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138 | Example: open a file with low priority, then read something from it with |
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139 | higher priority so the read request is serviced before other low priority |
|
|
140 | open requests (potentially spamming the cache): |
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141 | |
|
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142 | aioreq_pri -3; |
|
|
143 | aio_open ..., sub { |
|
|
144 | return unless $_[0]; |
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|
145 | |
|
|
146 | aioreq_pri -2; |
|
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147 | aio_read $_[0], ..., sub { |
|
|
148 | ... |
|
|
149 | }; |
|
|
150 | }; |
|
|
151 | |
|
|
152 | =item aioreq_nice $pri_adjust |
|
|
153 | |
|
|
154 | Similar to C<aioreq_pri>, but subtracts the given value from the current |
|
|
155 | priority, so effects are cumulative. |
127 | |
156 | |
128 | =item aio_open $pathname, $flags, $mode, $callback->($fh) |
157 | =item aio_open $pathname, $flags, $mode, $callback->($fh) |
129 | |
158 | |
130 | Asynchronously open or create a file and call the callback with a newly |
159 | Asynchronously open or create a file and call the callback with a newly |
131 | created filehandle for the file. |
160 | created filehandle for the file. |
… | |
… | |
681 | example, C<aio_scandir> might generate hundreds of thousands C<aio_stat> |
710 | example, C<aio_scandir> might generate hundreds of thousands C<aio_stat> |
682 | requests, delaying any later requests for a long time. |
711 | requests, delaying any later requests for a long time. |
683 | |
712 | |
684 | To avoid this, and allow incremental generation of requests, you can |
713 | To avoid this, and allow incremental generation of requests, you can |
685 | instead a group and set a feeder on it that generates those requests. The |
714 | instead a group and set a feeder on it that generates those requests. The |
686 | feed callback will be called whenever there are few enough (see C<feed_limit>, |
715 | feed callback will be called whenever there are few enough (see C<limit>, |
687 | below) requests active in the group itself and is expected to queue more |
716 | below) requests active in the group itself and is expected to queue more |
688 | requests. |
717 | requests. |
689 | |
718 | |
690 | The feed can queue as many requests as it likes (i.e. C<add> does not |
719 | The feed callback can queue as many requests as it likes (i.e. C<add> does |
691 | impose any limits). |
720 | not impose any limits). |
692 | |
721 | |
693 | If the feed does not queue more requests when called, it will be |
722 | If the feed does not queue more requests when called, it will be |
694 | automatically removed from the group. |
723 | automatically removed from the group. |
695 | |
724 | |
696 | If the feed limit is C<0>, it will be set to C<2> automatically. |
725 | If the feed limit is C<0>, it will be set to C<2> automatically. |
… | |
… | |
698 | Example: |
727 | Example: |
699 | |
728 | |
700 | # stat all files in @files, but only ever use four aio requests concurrently: |
729 | # stat all files in @files, but only ever use four aio requests concurrently: |
701 | |
730 | |
702 | my $grp = aio_group sub { print "finished\n" }; |
731 | my $grp = aio_group sub { print "finished\n" }; |
703 | feed_limit $grp 4; |
732 | limit $grp 4; |
704 | feed $grp sub { |
733 | feed $grp sub { |
705 | my $file = pop @files |
734 | my $file = pop @files |
706 | or return; |
735 | or return; |
707 | |
736 | |
708 | add $grp aio_stat $file, sub { ... }; |
737 | add $grp aio_stat $file, sub { ... }; |
709 | }; |
738 | }; |
710 | |
739 | |
711 | =item feed_limit $grp $num |
740 | =item limit $grp $num |
712 | |
741 | |
713 | Sets the feeder limit for the group: The feeder will be called whenever |
742 | Sets the feeder limit for the group: The feeder will be called whenever |
714 | the group contains less than this many requests. |
743 | the group contains less than this many requests. |
715 | |
744 | |
716 | Setting the limit to C<0> will pause the feeding process. |
745 | Setting the limit to C<0> will pause the feeding process. |
… | |
… | |
886 | Each thread needs a stack area which is usually around 16k, sometimes much |
915 | Each thread needs a stack area which is usually around 16k, sometimes much |
887 | larger, depending on the OS. |
916 | larger, depending on the OS. |
888 | |
917 | |
889 | =head1 SEE ALSO |
918 | =head1 SEE ALSO |
890 | |
919 | |
891 | L<Coro>, L<Linux::AIO> (obsolete). |
920 | L<Coro::AIO>. |
892 | |
921 | |
893 | =head1 AUTHOR |
922 | =head1 AUTHOR |
894 | |
923 | |
895 | Marc Lehmann <schmorp@schmorp.de> |
924 | Marc Lehmann <schmorp@schmorp.de> |
896 | http://home.schmorp.de/ |
925 | http://home.schmorp.de/ |