| … | |
… | |
| 31 | |
31 | |
| 32 | =cut |
32 | =cut |
| 33 | |
33 | |
| 34 | package Coro::Semaphore; |
34 | package Coro::Semaphore; |
| 35 | |
35 | |
|
|
36 | no warnings qw(uninitialized); |
|
|
37 | |
| 36 | use Coro (); |
38 | use Coro (); |
| 37 | |
39 | |
| 38 | $VERSION = 0.45; |
40 | $VERSION = 0.5; |
| 39 | |
41 | |
| 40 | =item new [inital count] |
42 | =item new [inital count] |
| 41 | |
43 | |
| 42 | Creates a new sempahore object with the given initial lock count. The |
44 | Creates a new sempahore object with the given initial lock count. The |
| 43 | default lock count is 1, which means it is unlocked by default. Zero (or |
45 | default lock count is 1, which means it is unlocked by default. Zero (or |
| … | |
… | |
| 56 | waits until the semaphore is available if the counter is zero. |
58 | waits until the semaphore is available if the counter is zero. |
| 57 | |
59 | |
| 58 | =cut |
60 | =cut |
| 59 | |
61 | |
| 60 | sub down { |
62 | sub down { |
| 61 | my $self = shift; |
|
|
| 62 | while ($self->[0] <= 0) { |
63 | while ($_[0][0] <= 0) { |
| 63 | push @{$self->[1]}, $Coro::current; |
64 | push @{$_[0][1]}, $Coro::current; |
| 64 | Coro::schedule; |
65 | Coro::schedule; |
| 65 | } |
66 | } |
| 66 | --$self->[0]; |
67 | --$_[0][0]; |
| 67 | } |
68 | } |
| 68 | |
69 | |
| 69 | =item $sem->up |
70 | =item $sem->up |
| 70 | |
71 | |
| 71 | Unlock the semaphore again. |
72 | Unlock the semaphore again. |
| 72 | |
73 | |
| 73 | =cut |
74 | =cut |
| 74 | |
75 | |
| 75 | sub up { |
76 | sub up { |
| 76 | my $self = shift; |
|
|
| 77 | if (++$self->[0] > 0) { |
77 | if (++$_[0][0] > 0) { |
| 78 | (shift @{$self->[1]})->ready if @{$self->[1]}; |
78 | (shift @{$_[0][1]})->ready if @{$_[0][1]}; |
| 79 | } |
79 | } |
| 80 | } |
80 | } |
| 81 | |
81 | |
| 82 | =item $sem->try |
82 | =item $sem->try |
| 83 | |
83 | |
| … | |
… | |
| 85 | otherwise return false and leave the semaphore unchanged. |
85 | otherwise return false and leave the semaphore unchanged. |
| 86 | |
86 | |
| 87 | =cut |
87 | =cut |
| 88 | |
88 | |
| 89 | sub try { |
89 | sub try { |
| 90 | my $self = shift; |
|
|
| 91 | if ($self->[0] > 0) { |
90 | if ($_[0][0] > 0) { |
| 92 | --$self->[0]; |
91 | --$_[0][0]; |
| 93 | return 1; |
92 | return 1; |
| 94 | } else { |
93 | } else { |
| 95 | return 0; |
94 | return 0; |
| 96 | } |
95 | } |
| 97 | } |
96 | } |
