| 1 | =head1 NAME |
1 | =head1 NAME |
| 2 | |
2 | |
| 3 | Coro - create an manage coroutines |
3 | Coro - create and manage coroutines |
| 4 | |
4 | |
| 5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
| 6 | |
6 | |
| 7 | use Coro; |
7 | use Coro; |
| 8 | |
8 | |
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9 | $new = new Coro sub { |
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10 | print "in coroutine, switching back\n"; |
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11 | $Coro::main->resume; |
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12 | print "in coroutine again, switching back\n"; |
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13 | $Coro::main->resume; |
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14 | }; |
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15 | |
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16 | print "in main, switching to coroutine\n"; |
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17 | $new->resume; |
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18 | print "back in main, switch to coroutine again\n"; |
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19 | $new->resume; |
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20 | print "back in main\n"; |
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21 | |
| 9 | =head1 DESCRIPTION |
22 | =head1 DESCRIPTION |
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23 | |
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24 | This module implements coroutines. Coroutines, similar to continuations, |
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25 | allow you to run more than one "thread of execution" in parallel. Unlike |
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26 | threads this, only voluntary switching is used so locking problems are |
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27 | greatly reduced. |
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28 | |
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29 | Although this is the "main" module of the Coro family it provides only |
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30 | low-level functionality. See L<Coro::Process> and related modules for a |
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31 | more useful process abstraction including scheduling. |
| 10 | |
32 | |
| 11 | =over 4 |
33 | =over 4 |
| 12 | |
34 | |
| 13 | =cut |
35 | =cut |
| 14 | |
36 | |
| 15 | package Coro; |
37 | package Coro; |
| 16 | |
38 | |
| 17 | BEGIN { |
39 | BEGIN { |
| 18 | $VERSION = 0.01; |
40 | $VERSION = 0.03; |
| 19 | |
41 | |
| 20 | require XSLoader; |
42 | require XSLoader; |
| 21 | XSLoader::load Coro, $VERSION; |
43 | XSLoader::load Coro, $VERSION; |
| 22 | } |
44 | } |
| 23 | |
45 | |
| … | |
… | |
| 45 | |
67 | |
| 46 | $error_msg = |
68 | $error_msg = |
| 47 | $error_coro = undef; |
69 | $error_coro = undef; |
| 48 | |
70 | |
| 49 | $error = _newprocess { |
71 | $error = _newprocess { |
| 50 | print STDERR "FATAL: $error_msg, program aborted\n"; |
72 | print STDERR "FATAL: $error_msg\nprogram aborted\n"; |
| 51 | exit 250; |
73 | exit 250; |
| 52 | }; |
74 | }; |
| 53 | |
75 | |
| 54 | =item $coro = new $coderef [, @args] |
76 | =item $coro = new $coderef [, @args] |
| 55 | |
77 | |
| … | |
… | |
| 68 | eval { &$proc->resume }; |
90 | eval { &$proc->resume }; |
| 69 | if ($@) { |
91 | if ($@) { |
| 70 | ($error_msg, $error_coro) = ($@, $current); |
92 | ($error_msg, $error_coro) = ($@, $current); |
| 71 | $error->resume; |
93 | $error->resume; |
| 72 | } |
94 | } |
| 73 | } while (); |
95 | } while (1); |
| 74 | }, $class; |
96 | }, $class; |
| 75 | } |
97 | } |
| 76 | |
98 | |
| 77 | =item $coro->resume |
99 | =item $coro->resume |
| 78 | |
100 | |
| … | |
… | |
| 80 | |
102 | |
| 81 | =cut |
103 | =cut |
| 82 | |
104 | |
| 83 | my $prev; |
105 | my $prev; |
| 84 | |
106 | |
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107 | # I call the _transfer function from a pelr function |
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108 | # because that way perl saves all important things on |
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109 | # the stack. |
| 85 | sub resume { |
110 | sub resume { |
| 86 | $prev = $current; $current = $_[0]; |
111 | $prev = $current; $current = $_[0]; |
| 87 | _transfer($prev, $current); |
112 | _transfer($prev, $current); |
| 88 | } |
113 | } |
| 89 | |
114 | |
| … | |
… | |
| 93 | |
118 | |
| 94 | =head1 BUGS |
119 | =head1 BUGS |
| 95 | |
120 | |
| 96 | This module has not yet been extensively tested. |
121 | This module has not yet been extensively tested. |
| 97 | |
122 | |
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123 | =head1 SEE ALSO |
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124 | |
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125 | L<Coro::Process>, L<Coro::Signal>. |
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126 | |
| 98 | =head1 AUTHOR |
127 | =head1 AUTHOR |
| 99 | |
128 | |
| 100 | Marc Lehmann <pcg@goof.com> |
129 | Marc Lehmann <pcg@goof.com> |
| 101 | http://www.goof.com/pcg/marc/ |
130 | http://www.goof.com/pcg/marc/ |
| 102 | |
131 | |
